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Re: [Qemu-devel] [Bug 939027] Re: Combining direct_io and non-direct_io

From: Avleen Vig
Subject: Re: [Qemu-devel] [Bug 939027] Re: Combining direct_io and non-direct_io leads to hang
Date: Fri, 24 Feb 2012 06:47:19 -0000 
Excellent. I will do this the next time I see this happen. It probably
won't be long.
On Feb 24, 2012 12:45 AM, "Stefan Hajnoczi" <address@hidden>
wrote:

> On Thu, Feb 23, 2012 at 9:39 PM, Avleen Vig <address@hidden>
> wrote:
> > Nothing else at all accesses those files, which is one of the things
> that concerned me the most :-/
> > It looks like it call came from the same place.
>
> It's possible to check the file descriptor flags using
> /proc/$PID/fdinfo/$FD.  So for example, you could find the qemu-kvm
> process and list its open file descriptors using ls -l /proc/$(pgrep
> qemu-kvm)/fd.  Find the file descriptor to the image file and look up
> its flags in /proc/$PID/fdinfo/$FD.
>
> If the file descriptor has bit 040000 set then it is O_DIRECT.  If
> not, it uses buffered I/O.
>
> Using this technique you could determine whether or not your system is
> accessing the file using both direct and buffered I/O.  It would also
> tell you which processes are doing this.
>
> Stefan
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/939027
>
> Title:
>  Combining direct_io and non-direct_io leads to hang
>
> Status in QEMU:
>  New
>
> Bug description:
>  Version 0.12.2 - I know this isn't the latest but I looked through the
>  changelogs and couldn't find any references to this being fixed.
>
>  This is related to issues that many apps have, and is described in more
> detail here:
>      http://oss.sgi.com/archives/xfs/2010-07/msg00163.html
>  and:
>      https://bugs.launchpad.net/percona-xtrabackup/+bug/606981
>
>  When using both direct io and buffered io on the same file, you can cause
> corruption on the filesystem and other issues.
>  XFS out right hangs, but the problem exists on ext3 and other filesystems
> which silently carry on.
>
>  **this is a data corruption issue**.
>
>  This is the full stack trace we got from a recent hang:
>
>  Feb 22 19:55:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 19:55:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 19:55:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 19:55:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 19:55:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 19:55:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 19:55:14 virt11 kernel: Call Trace:
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 19:55:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 19:55:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 19:57:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 19:57:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 19:57:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 19:57:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 19:57:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 19:57:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 19:57:14 virt11 kernel: Call Trace:
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 19:57:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 19:57:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 19:59:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 19:59:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 19:59:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 19:59:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 19:59:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 19:59:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 19:59:14 virt11 kernel: Call Trace:
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 19:59:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 19:59:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:01:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:01:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:01:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:01:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:01:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:01:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:01:14 virt11 kernel: Call Trace:
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:01:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:01:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:03:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:03:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:03:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:03:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:03:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:03:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:03:14 virt11 kernel: Call Trace:
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:03:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:03:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:05:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:05:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:05:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:05:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:05:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:05:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:05:14 virt11 kernel: Call Trace:
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:05:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:05:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:07:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:07:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:07:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:07:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:07:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:07:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:07:14 virt11 kernel: Call Trace:
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:07:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:07:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:09:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:09:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:09:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:09:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:09:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:09:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:09:14 virt11 kernel: Call Trace:
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:09:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:09:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:11:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:11:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:11:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:11:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:11:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:11:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:11:14 virt11 kernel: Call Trace:
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:11:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:11:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>  Feb 22 20:13:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more
> than 120 seconds.
>  Feb 22 20:13:14 virt11 kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>  Feb 22 20:13:14 virt11 kernel: qemu-kvm      D 0000000000000002     0
> 18360      1 0x00000080
>  Feb 22 20:13:14 virt11 kernel: ffff8808614457e8 0000000000000086
> ffff8800282d5f80 ffff8800282d5f80
>  Feb 22 20:13:14 virt11 kernel: ffff880861445768 ffffffff810573ce
> ffff880861445768 0000000000000086
>  Feb 22 20:13:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8
> 000000000000f598 ffff8808f15bba78
>  Feb 22 20:13:14 virt11 kernel: Call Trace:
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff810573ce>] ?
> activate_task+0x2e/0x40
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff814dd755>]
> rwsem_down_failed_common+0x95/0x1d0
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff814dd8b3>]
> rwsem_down_write_failed+0x23/0x30
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8126e573>]
> call_rwsem_down_write_failed+0x13/0x20
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0
> [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440
> [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0354116>]
> __xfs_get_blocks+0x86/0x200 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa03542aa>]
> xfs_get_blocks_direct+0x1a/0x20 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff811ac132>]
> __blockdev_direct_IO+0x872/0xc40
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0353f50>]
> xfs_vm_direct_IO+0xb0/0xf0 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0354290>] ?
> xfs_get_blocks_direct+0x0/0x20 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0353cc0>] ?
> xfs_end_io_direct+0x0/0xe0 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8106dd57>] ?
> current_fs_time+0x27/0x30
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8110df22>]
> generic_file_direct_write+0xc2/0x190
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa034bfcf>] ?
> xfs_trans_unlocked_item+0x4f/0x60 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70
> [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8105dc72>] ?
> default_wake_function+0x12/0x20
>  Feb 22 20:13:14 virt11 kernel: [<ffffffffa03599a1>]
> xfs_file_aio_write+0x61/0x70 [xfs]
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8117241a>]
> do_sync_write+0xfa/0x140
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8107fbc2>] ?
> send_signal+0x42/0x80
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8108e160>] ?
> autoremove_wake_function+0x0/0x40
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8107ff96>] ?
> group_send_sig_info+0x56/0x70
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff81211d3b>] ?
> selinux_file_permission+0xfb/0x150
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff812051a6>] ?
> security_file_permission+0x16/0x20
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff810d1b62>] ?
> audit_syscall_entry+0x272/0x2a0
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
>  Feb 22 20:13:14 virt11 kernel: [<ffffffff8100b172>]
> system_call_fastpath+0x16/0x1b
>
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>

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https://bugs.launchpad.net/bugs/939027

Title:
  Combining direct_io and non-direct_io leads to hang

Status in QEMU:
  New

Bug description:
  Version 0.12.2 - I know this isn't the latest but I looked through the
  changelogs and couldn't find any references to this being fixed.

  This is related to issues that many apps have, and is described in more 
detail here:
      http://oss.sgi.com/archives/xfs/2010-07/msg00163.html
  and:
      https://bugs.launchpad.net/percona-xtrabackup/+bug/606981

  When using both direct io and buffered io on the same file, you can cause 
corruption on the filesystem and other issues.
  XFS out right hangs, but the problem exists on ext3 and other filesystems 
which silently carry on.

  **this is a data corruption issue**.

  This is the full stack trace we got from a recent hang:

  Feb 22 19:55:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more 
than 120 seconds.
  Feb 22 19:55:14 virt11 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Feb 22 19:55:14 virt11 kernel: qemu-kvm      D 0000000000000002     0 18360   
   1 0x00000080
  Feb 22 19:55:14 virt11 kernel: ffff8808614457e8 0000000000000086 
ffff8800282d5f80 ffff8800282d5f80
  Feb 22 19:55:14 virt11 kernel: ffff880861445768 ffffffff810573ce 
ffff880861445768 0000000000000086
  Feb 22 19:55:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8 
000000000000f598 ffff8808f15bba78
  Feb 22 19:55:14 virt11 kernel: Call Trace:
  Feb 22 19:55:14 virt11 kernel: [<ffffffff810573ce>] ? activate_task+0x2e/0x40
  Feb 22 19:55:14 virt11 kernel: [<ffffffff814dd755>] 
rwsem_down_failed_common+0x95/0x1d0
  Feb 22 19:55:14 virt11 kernel: [<ffffffff814dd8b3>] 
rwsem_down_write_failed+0x23/0x30
  Feb 22 19:55:14 virt11 kernel: [<ffffffff8126e573>] 
call_rwsem_down_write_failed+0x13/0x20
  Feb 22 19:55:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0 [xfs]
  Feb 22 19:55:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440 
[xfs]
  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0354116>] 
__xfs_get_blocks+0x86/0x200 [xfs]
  Feb 22 19:55:14 virt11 kernel: [<ffffffffa03542aa>] 
xfs_get_blocks_direct+0x1a/0x20 [xfs]
  Feb 22 19:55:14 virt11 kernel: [<ffffffff811ac132>] 
__blockdev_direct_IO+0x872/0xc40
  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0353f50>] 
xfs_vm_direct_IO+0xb0/0xf0 [xfs]
  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0354290>] ? 
xfs_get_blocks_direct+0x0/0x20 [xfs]
  Feb 22 19:55:14 virt11 kernel: [<ffffffffa0353cc0>] ? 
xfs_end_io_direct+0x0/0xe0 [xfs]
  Feb 22 19:55:14 virt11 kernel: [<ffffffff8106dd57>] ? 
current_fs_time+0x27/0x30
  Feb 22 19:55:14 virt11 kernel: [<ffffffff8110df22>] 
generic_file_direct_write+0xc2/0x190
  Feb 22 19:55:14 virt11 kernel: [<ffffffffa034bfcf>] ? 
xfs_trans_unlocked_item+0x4f/0x60 [xfs]
  Feb 22 19:55:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70 
[xfs]
  Feb 22 19:55:14 virt11 kernel: [<ffffffff8105dc72>] ? 
default_wake_function+0x12/0x20
  Feb 22 19:55:14 virt11 kernel: [<ffffffffa03599a1>] 
xfs_file_aio_write+0x61/0x70 [xfs]
  Feb 22 19:55:14 virt11 kernel: [<ffffffff8117241a>] do_sync_write+0xfa/0x140
  Feb 22 19:55:14 virt11 kernel: [<ffffffff8107fbc2>] ? send_signal+0x42/0x80
  Feb 22 19:55:14 virt11 kernel: [<ffffffff8108e160>] ? 
autoremove_wake_function+0x0/0x40
  Feb 22 19:55:14 virt11 kernel: [<ffffffff8107ff96>] ? 
group_send_sig_info+0x56/0x70
  Feb 22 19:55:14 virt11 kernel: [<ffffffff81211d3b>] ? 
selinux_file_permission+0xfb/0x150
  Feb 22 19:55:14 virt11 kernel: [<ffffffff812051a6>] ? 
security_file_permission+0x16/0x20
  Feb 22 19:55:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
  Feb 22 19:55:14 virt11 kernel: [<ffffffff810d1b62>] ? 
audit_syscall_entry+0x272/0x2a0
  Feb 22 19:55:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
  Feb 22 19:55:14 virt11 kernel: [<ffffffff8100b172>] 
system_call_fastpath+0x16/0x1b
  Feb 22 19:57:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more 
than 120 seconds.
  Feb 22 19:57:14 virt11 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Feb 22 19:57:14 virt11 kernel: qemu-kvm      D 0000000000000002     0 18360   
   1 0x00000080
  Feb 22 19:57:14 virt11 kernel: ffff8808614457e8 0000000000000086 
ffff8800282d5f80 ffff8800282d5f80
  Feb 22 19:57:14 virt11 kernel: ffff880861445768 ffffffff810573ce 
ffff880861445768 0000000000000086
  Feb 22 19:57:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8 
000000000000f598 ffff8808f15bba78
  Feb 22 19:57:14 virt11 kernel: Call Trace:
  Feb 22 19:57:14 virt11 kernel: [<ffffffff810573ce>] ? activate_task+0x2e/0x40
  Feb 22 19:57:14 virt11 kernel: [<ffffffff814dd755>] 
rwsem_down_failed_common+0x95/0x1d0
  Feb 22 19:57:14 virt11 kernel: [<ffffffff814dd8b3>] 
rwsem_down_write_failed+0x23/0x30
  Feb 22 19:57:14 virt11 kernel: [<ffffffff8126e573>] 
call_rwsem_down_write_failed+0x13/0x20
  Feb 22 19:57:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0 [xfs]
  Feb 22 19:57:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440 
[xfs]
  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0354116>] 
__xfs_get_blocks+0x86/0x200 [xfs]
  Feb 22 19:57:14 virt11 kernel: [<ffffffffa03542aa>] 
xfs_get_blocks_direct+0x1a/0x20 [xfs]
  Feb 22 19:57:14 virt11 kernel: [<ffffffff811ac132>] 
__blockdev_direct_IO+0x872/0xc40
  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0353f50>] 
xfs_vm_direct_IO+0xb0/0xf0 [xfs]
  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0354290>] ? 
xfs_get_blocks_direct+0x0/0x20 [xfs]
  Feb 22 19:57:14 virt11 kernel: [<ffffffffa0353cc0>] ? 
xfs_end_io_direct+0x0/0xe0 [xfs]
  Feb 22 19:57:14 virt11 kernel: [<ffffffff8106dd57>] ? 
current_fs_time+0x27/0x30
  Feb 22 19:57:14 virt11 kernel: [<ffffffff8110df22>] 
generic_file_direct_write+0xc2/0x190
  Feb 22 19:57:14 virt11 kernel: [<ffffffffa034bfcf>] ? 
xfs_trans_unlocked_item+0x4f/0x60 [xfs]
  Feb 22 19:57:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70 
[xfs]
  Feb 22 19:57:14 virt11 kernel: [<ffffffff8105dc72>] ? 
default_wake_function+0x12/0x20
  Feb 22 19:57:14 virt11 kernel: [<ffffffffa03599a1>] 
xfs_file_aio_write+0x61/0x70 [xfs]
  Feb 22 19:57:14 virt11 kernel: [<ffffffff8117241a>] do_sync_write+0xfa/0x140
  Feb 22 19:57:14 virt11 kernel: [<ffffffff8107fbc2>] ? send_signal+0x42/0x80
  Feb 22 19:57:14 virt11 kernel: [<ffffffff8108e160>] ? 
autoremove_wake_function+0x0/0x40
  Feb 22 19:57:14 virt11 kernel: [<ffffffff8107ff96>] ? 
group_send_sig_info+0x56/0x70
  Feb 22 19:57:14 virt11 kernel: [<ffffffff81211d3b>] ? 
selinux_file_permission+0xfb/0x150
  Feb 22 19:57:14 virt11 kernel: [<ffffffff812051a6>] ? 
security_file_permission+0x16/0x20
  Feb 22 19:57:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
  Feb 22 19:57:14 virt11 kernel: [<ffffffff810d1b62>] ? 
audit_syscall_entry+0x272/0x2a0
  Feb 22 19:57:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
  Feb 22 19:57:14 virt11 kernel: [<ffffffff8100b172>] 
system_call_fastpath+0x16/0x1b
  Feb 22 19:59:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more 
than 120 seconds.
  Feb 22 19:59:14 virt11 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Feb 22 19:59:14 virt11 kernel: qemu-kvm      D 0000000000000002     0 18360   
   1 0x00000080
  Feb 22 19:59:14 virt11 kernel: ffff8808614457e8 0000000000000086 
ffff8800282d5f80 ffff8800282d5f80
  Feb 22 19:59:14 virt11 kernel: ffff880861445768 ffffffff810573ce 
ffff880861445768 0000000000000086
  Feb 22 19:59:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8 
000000000000f598 ffff8808f15bba78
  Feb 22 19:59:14 virt11 kernel: Call Trace:
  Feb 22 19:59:14 virt11 kernel: [<ffffffff810573ce>] ? activate_task+0x2e/0x40
  Feb 22 19:59:14 virt11 kernel: [<ffffffff814dd755>] 
rwsem_down_failed_common+0x95/0x1d0
  Feb 22 19:59:14 virt11 kernel: [<ffffffff814dd8b3>] 
rwsem_down_write_failed+0x23/0x30
  Feb 22 19:59:14 virt11 kernel: [<ffffffff8126e573>] 
call_rwsem_down_write_failed+0x13/0x20
  Feb 22 19:59:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0 [xfs]
  Feb 22 19:59:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440 
[xfs]
  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0354116>] 
__xfs_get_blocks+0x86/0x200 [xfs]
  Feb 22 19:59:14 virt11 kernel: [<ffffffffa03542aa>] 
xfs_get_blocks_direct+0x1a/0x20 [xfs]
  Feb 22 19:59:14 virt11 kernel: [<ffffffff811ac132>] 
__blockdev_direct_IO+0x872/0xc40
  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0353f50>] 
xfs_vm_direct_IO+0xb0/0xf0 [xfs]
  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0354290>] ? 
xfs_get_blocks_direct+0x0/0x20 [xfs]
  Feb 22 19:59:14 virt11 kernel: [<ffffffffa0353cc0>] ? 
xfs_end_io_direct+0x0/0xe0 [xfs]
  Feb 22 19:59:14 virt11 kernel: [<ffffffff8106dd57>] ? 
current_fs_time+0x27/0x30
  Feb 22 19:59:14 virt11 kernel: [<ffffffff8110df22>] 
generic_file_direct_write+0xc2/0x190
  Feb 22 19:59:14 virt11 kernel: [<ffffffffa034bfcf>] ? 
xfs_trans_unlocked_item+0x4f/0x60 [xfs]
  Feb 22 19:59:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70 
[xfs]
  Feb 22 19:59:14 virt11 kernel: [<ffffffff8105dc72>] ? 
default_wake_function+0x12/0x20
  Feb 22 19:59:14 virt11 kernel: [<ffffffffa03599a1>] 
xfs_file_aio_write+0x61/0x70 [xfs]
  Feb 22 19:59:14 virt11 kernel: [<ffffffff8117241a>] do_sync_write+0xfa/0x140
  Feb 22 19:59:14 virt11 kernel: [<ffffffff8107fbc2>] ? send_signal+0x42/0x80
  Feb 22 19:59:14 virt11 kernel: [<ffffffff8108e160>] ? 
autoremove_wake_function+0x0/0x40
  Feb 22 19:59:14 virt11 kernel: [<ffffffff8107ff96>] ? 
group_send_sig_info+0x56/0x70
  Feb 22 19:59:14 virt11 kernel: [<ffffffff81211d3b>] ? 
selinux_file_permission+0xfb/0x150
  Feb 22 19:59:14 virt11 kernel: [<ffffffff812051a6>] ? 
security_file_permission+0x16/0x20
  Feb 22 19:59:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
  Feb 22 19:59:14 virt11 kernel: [<ffffffff810d1b62>] ? 
audit_syscall_entry+0x272/0x2a0
  Feb 22 19:59:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
  Feb 22 19:59:14 virt11 kernel: [<ffffffff8100b172>] 
system_call_fastpath+0x16/0x1b
  Feb 22 20:01:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more 
than 120 seconds.
  Feb 22 20:01:14 virt11 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Feb 22 20:01:14 virt11 kernel: qemu-kvm      D 0000000000000002     0 18360   
   1 0x00000080
  Feb 22 20:01:14 virt11 kernel: ffff8808614457e8 0000000000000086 
ffff8800282d5f80 ffff8800282d5f80
  Feb 22 20:01:14 virt11 kernel: ffff880861445768 ffffffff810573ce 
ffff880861445768 0000000000000086
  Feb 22 20:01:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8 
000000000000f598 ffff8808f15bba78
  Feb 22 20:01:14 virt11 kernel: Call Trace:
  Feb 22 20:01:14 virt11 kernel: [<ffffffff810573ce>] ? activate_task+0x2e/0x40
  Feb 22 20:01:14 virt11 kernel: [<ffffffff814dd755>] 
rwsem_down_failed_common+0x95/0x1d0
  Feb 22 20:01:14 virt11 kernel: [<ffffffff814dd8b3>] 
rwsem_down_write_failed+0x23/0x30
  Feb 22 20:01:14 virt11 kernel: [<ffffffff8126e573>] 
call_rwsem_down_write_failed+0x13/0x20
  Feb 22 20:01:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0 [xfs]
  Feb 22 20:01:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440 
[xfs]
  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0354116>] 
__xfs_get_blocks+0x86/0x200 [xfs]
  Feb 22 20:01:14 virt11 kernel: [<ffffffffa03542aa>] 
xfs_get_blocks_direct+0x1a/0x20 [xfs]
  Feb 22 20:01:14 virt11 kernel: [<ffffffff811ac132>] 
__blockdev_direct_IO+0x872/0xc40
  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0353f50>] 
xfs_vm_direct_IO+0xb0/0xf0 [xfs]
  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0354290>] ? 
xfs_get_blocks_direct+0x0/0x20 [xfs]
  Feb 22 20:01:14 virt11 kernel: [<ffffffffa0353cc0>] ? 
xfs_end_io_direct+0x0/0xe0 [xfs]
  Feb 22 20:01:14 virt11 kernel: [<ffffffff8106dd57>] ? 
current_fs_time+0x27/0x30
  Feb 22 20:01:14 virt11 kernel: [<ffffffff8110df22>] 
generic_file_direct_write+0xc2/0x190
  Feb 22 20:01:14 virt11 kernel: [<ffffffffa034bfcf>] ? 
xfs_trans_unlocked_item+0x4f/0x60 [xfs]
  Feb 22 20:01:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70 
[xfs]
  Feb 22 20:01:14 virt11 kernel: [<ffffffff8105dc72>] ? 
default_wake_function+0x12/0x20
  Feb 22 20:01:14 virt11 kernel: [<ffffffffa03599a1>] 
xfs_file_aio_write+0x61/0x70 [xfs]
  Feb 22 20:01:14 virt11 kernel: [<ffffffff8117241a>] do_sync_write+0xfa/0x140
  Feb 22 20:01:14 virt11 kernel: [<ffffffff8107fbc2>] ? send_signal+0x42/0x80
  Feb 22 20:01:14 virt11 kernel: [<ffffffff8108e160>] ? 
autoremove_wake_function+0x0/0x40
  Feb 22 20:01:14 virt11 kernel: [<ffffffff8107ff96>] ? 
group_send_sig_info+0x56/0x70
  Feb 22 20:01:14 virt11 kernel: [<ffffffff81211d3b>] ? 
selinux_file_permission+0xfb/0x150
  Feb 22 20:01:14 virt11 kernel: [<ffffffff812051a6>] ? 
security_file_permission+0x16/0x20
  Feb 22 20:01:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
  Feb 22 20:01:14 virt11 kernel: [<ffffffff810d1b62>] ? 
audit_syscall_entry+0x272/0x2a0
  Feb 22 20:01:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
  Feb 22 20:01:14 virt11 kernel: [<ffffffff8100b172>] 
system_call_fastpath+0x16/0x1b
  Feb 22 20:03:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more 
than 120 seconds.
  Feb 22 20:03:14 virt11 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Feb 22 20:03:14 virt11 kernel: qemu-kvm      D 0000000000000002     0 18360   
   1 0x00000080
  Feb 22 20:03:14 virt11 kernel: ffff8808614457e8 0000000000000086 
ffff8800282d5f80 ffff8800282d5f80
  Feb 22 20:03:14 virt11 kernel: ffff880861445768 ffffffff810573ce 
ffff880861445768 0000000000000086
  Feb 22 20:03:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8 
000000000000f598 ffff8808f15bba78
  Feb 22 20:03:14 virt11 kernel: Call Trace:
  Feb 22 20:03:14 virt11 kernel: [<ffffffff810573ce>] ? activate_task+0x2e/0x40
  Feb 22 20:03:14 virt11 kernel: [<ffffffff814dd755>] 
rwsem_down_failed_common+0x95/0x1d0
  Feb 22 20:03:14 virt11 kernel: [<ffffffff814dd8b3>] 
rwsem_down_write_failed+0x23/0x30
  Feb 22 20:03:14 virt11 kernel: [<ffffffff8126e573>] 
call_rwsem_down_write_failed+0x13/0x20
  Feb 22 20:03:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0 [xfs]
  Feb 22 20:03:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440 
[xfs]
  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0354116>] 
__xfs_get_blocks+0x86/0x200 [xfs]
  Feb 22 20:03:14 virt11 kernel: [<ffffffffa03542aa>] 
xfs_get_blocks_direct+0x1a/0x20 [xfs]
  Feb 22 20:03:14 virt11 kernel: [<ffffffff811ac132>] 
__blockdev_direct_IO+0x872/0xc40
  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0353f50>] 
xfs_vm_direct_IO+0xb0/0xf0 [xfs]
  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0354290>] ? 
xfs_get_blocks_direct+0x0/0x20 [xfs]
  Feb 22 20:03:14 virt11 kernel: [<ffffffffa0353cc0>] ? 
xfs_end_io_direct+0x0/0xe0 [xfs]
  Feb 22 20:03:14 virt11 kernel: [<ffffffff8106dd57>] ? 
current_fs_time+0x27/0x30
  Feb 22 20:03:14 virt11 kernel: [<ffffffff8110df22>] 
generic_file_direct_write+0xc2/0x190
  Feb 22 20:03:14 virt11 kernel: [<ffffffffa034bfcf>] ? 
xfs_trans_unlocked_item+0x4f/0x60 [xfs]
  Feb 22 20:03:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70 
[xfs]
  Feb 22 20:03:14 virt11 kernel: [<ffffffff8105dc72>] ? 
default_wake_function+0x12/0x20
  Feb 22 20:03:14 virt11 kernel: [<ffffffffa03599a1>] 
xfs_file_aio_write+0x61/0x70 [xfs]
  Feb 22 20:03:14 virt11 kernel: [<ffffffff8117241a>] do_sync_write+0xfa/0x140
  Feb 22 20:03:14 virt11 kernel: [<ffffffff8107fbc2>] ? send_signal+0x42/0x80
  Feb 22 20:03:14 virt11 kernel: [<ffffffff8108e160>] ? 
autoremove_wake_function+0x0/0x40
  Feb 22 20:03:14 virt11 kernel: [<ffffffff8107ff96>] ? 
group_send_sig_info+0x56/0x70
  Feb 22 20:03:14 virt11 kernel: [<ffffffff81211d3b>] ? 
selinux_file_permission+0xfb/0x150
  Feb 22 20:03:14 virt11 kernel: [<ffffffff812051a6>] ? 
security_file_permission+0x16/0x20
  Feb 22 20:03:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
  Feb 22 20:03:14 virt11 kernel: [<ffffffff810d1b62>] ? 
audit_syscall_entry+0x272/0x2a0
  Feb 22 20:03:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
  Feb 22 20:03:14 virt11 kernel: [<ffffffff8100b172>] 
system_call_fastpath+0x16/0x1b
  Feb 22 20:05:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more 
than 120 seconds.
  Feb 22 20:05:14 virt11 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Feb 22 20:05:14 virt11 kernel: qemu-kvm      D 0000000000000002     0 18360   
   1 0x00000080
  Feb 22 20:05:14 virt11 kernel: ffff8808614457e8 0000000000000086 
ffff8800282d5f80 ffff8800282d5f80
  Feb 22 20:05:14 virt11 kernel: ffff880861445768 ffffffff810573ce 
ffff880861445768 0000000000000086
  Feb 22 20:05:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8 
000000000000f598 ffff8808f15bba78
  Feb 22 20:05:14 virt11 kernel: Call Trace:
  Feb 22 20:05:14 virt11 kernel: [<ffffffff810573ce>] ? activate_task+0x2e/0x40
  Feb 22 20:05:14 virt11 kernel: [<ffffffff814dd755>] 
rwsem_down_failed_common+0x95/0x1d0
  Feb 22 20:05:14 virt11 kernel: [<ffffffff814dd8b3>] 
rwsem_down_write_failed+0x23/0x30
  Feb 22 20:05:14 virt11 kernel: [<ffffffff8126e573>] 
call_rwsem_down_write_failed+0x13/0x20
  Feb 22 20:05:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0 [xfs]
  Feb 22 20:05:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440 
[xfs]
  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0354116>] 
__xfs_get_blocks+0x86/0x200 [xfs]
  Feb 22 20:05:14 virt11 kernel: [<ffffffffa03542aa>] 
xfs_get_blocks_direct+0x1a/0x20 [xfs]
  Feb 22 20:05:14 virt11 kernel: [<ffffffff811ac132>] 
__blockdev_direct_IO+0x872/0xc40
  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0353f50>] 
xfs_vm_direct_IO+0xb0/0xf0 [xfs]
  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0354290>] ? 
xfs_get_blocks_direct+0x0/0x20 [xfs]
  Feb 22 20:05:14 virt11 kernel: [<ffffffffa0353cc0>] ? 
xfs_end_io_direct+0x0/0xe0 [xfs]
  Feb 22 20:05:14 virt11 kernel: [<ffffffff8106dd57>] ? 
current_fs_time+0x27/0x30
  Feb 22 20:05:14 virt11 kernel: [<ffffffff8110df22>] 
generic_file_direct_write+0xc2/0x190
  Feb 22 20:05:14 virt11 kernel: [<ffffffffa034bfcf>] ? 
xfs_trans_unlocked_item+0x4f/0x60 [xfs]
  Feb 22 20:05:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70 
[xfs]
  Feb 22 20:05:14 virt11 kernel: [<ffffffff8105dc72>] ? 
default_wake_function+0x12/0x20
  Feb 22 20:05:14 virt11 kernel: [<ffffffffa03599a1>] 
xfs_file_aio_write+0x61/0x70 [xfs]
  Feb 22 20:05:14 virt11 kernel: [<ffffffff8117241a>] do_sync_write+0xfa/0x140
  Feb 22 20:05:14 virt11 kernel: [<ffffffff8107fbc2>] ? send_signal+0x42/0x80
  Feb 22 20:05:14 virt11 kernel: [<ffffffff8108e160>] ? 
autoremove_wake_function+0x0/0x40
  Feb 22 20:05:14 virt11 kernel: [<ffffffff8107ff96>] ? 
group_send_sig_info+0x56/0x70
  Feb 22 20:05:14 virt11 kernel: [<ffffffff81211d3b>] ? 
selinux_file_permission+0xfb/0x150
  Feb 22 20:05:14 virt11 kernel: [<ffffffff812051a6>] ? 
security_file_permission+0x16/0x20
  Feb 22 20:05:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
  Feb 22 20:05:14 virt11 kernel: [<ffffffff810d1b62>] ? 
audit_syscall_entry+0x272/0x2a0
  Feb 22 20:05:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
  Feb 22 20:05:14 virt11 kernel: [<ffffffff8100b172>] 
system_call_fastpath+0x16/0x1b
  Feb 22 20:07:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more 
than 120 seconds.
  Feb 22 20:07:14 virt11 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Feb 22 20:07:14 virt11 kernel: qemu-kvm      D 0000000000000002     0 18360   
   1 0x00000080
  Feb 22 20:07:14 virt11 kernel: ffff8808614457e8 0000000000000086 
ffff8800282d5f80 ffff8800282d5f80
  Feb 22 20:07:14 virt11 kernel: ffff880861445768 ffffffff810573ce 
ffff880861445768 0000000000000086
  Feb 22 20:07:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8 
000000000000f598 ffff8808f15bba78
  Feb 22 20:07:14 virt11 kernel: Call Trace:
  Feb 22 20:07:14 virt11 kernel: [<ffffffff810573ce>] ? activate_task+0x2e/0x40
  Feb 22 20:07:14 virt11 kernel: [<ffffffff814dd755>] 
rwsem_down_failed_common+0x95/0x1d0
  Feb 22 20:07:14 virt11 kernel: [<ffffffff814dd8b3>] 
rwsem_down_write_failed+0x23/0x30
  Feb 22 20:07:14 virt11 kernel: [<ffffffff8126e573>] 
call_rwsem_down_write_failed+0x13/0x20
  Feb 22 20:07:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0 [xfs]
  Feb 22 20:07:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440 
[xfs]
  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0354116>] 
__xfs_get_blocks+0x86/0x200 [xfs]
  Feb 22 20:07:14 virt11 kernel: [<ffffffffa03542aa>] 
xfs_get_blocks_direct+0x1a/0x20 [xfs]
  Feb 22 20:07:14 virt11 kernel: [<ffffffff811ac132>] 
__blockdev_direct_IO+0x872/0xc40
  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0353f50>] 
xfs_vm_direct_IO+0xb0/0xf0 [xfs]
  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0354290>] ? 
xfs_get_blocks_direct+0x0/0x20 [xfs]
  Feb 22 20:07:14 virt11 kernel: [<ffffffffa0353cc0>] ? 
xfs_end_io_direct+0x0/0xe0 [xfs]
  Feb 22 20:07:14 virt11 kernel: [<ffffffff8106dd57>] ? 
current_fs_time+0x27/0x30
  Feb 22 20:07:14 virt11 kernel: [<ffffffff8110df22>] 
generic_file_direct_write+0xc2/0x190
  Feb 22 20:07:14 virt11 kernel: [<ffffffffa034bfcf>] ? 
xfs_trans_unlocked_item+0x4f/0x60 [xfs]
  Feb 22 20:07:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70 
[xfs]
  Feb 22 20:07:14 virt11 kernel: [<ffffffff8105dc72>] ? 
default_wake_function+0x12/0x20
  Feb 22 20:07:14 virt11 kernel: [<ffffffffa03599a1>] 
xfs_file_aio_write+0x61/0x70 [xfs]
  Feb 22 20:07:14 virt11 kernel: [<ffffffff8117241a>] do_sync_write+0xfa/0x140
  Feb 22 20:07:14 virt11 kernel: [<ffffffff8107fbc2>] ? send_signal+0x42/0x80
  Feb 22 20:07:14 virt11 kernel: [<ffffffff8108e160>] ? 
autoremove_wake_function+0x0/0x40
  Feb 22 20:07:14 virt11 kernel: [<ffffffff8107ff96>] ? 
group_send_sig_info+0x56/0x70
  Feb 22 20:07:14 virt11 kernel: [<ffffffff81211d3b>] ? 
selinux_file_permission+0xfb/0x150
  Feb 22 20:07:14 virt11 kernel: [<ffffffff812051a6>] ? 
security_file_permission+0x16/0x20
  Feb 22 20:07:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
  Feb 22 20:07:14 virt11 kernel: [<ffffffff810d1b62>] ? 
audit_syscall_entry+0x272/0x2a0
  Feb 22 20:07:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
  Feb 22 20:07:14 virt11 kernel: [<ffffffff8100b172>] 
system_call_fastpath+0x16/0x1b
  Feb 22 20:09:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more 
than 120 seconds.
  Feb 22 20:09:14 virt11 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Feb 22 20:09:14 virt11 kernel: qemu-kvm      D 0000000000000002     0 18360   
   1 0x00000080
  Feb 22 20:09:14 virt11 kernel: ffff8808614457e8 0000000000000086 
ffff8800282d5f80 ffff8800282d5f80
  Feb 22 20:09:14 virt11 kernel: ffff880861445768 ffffffff810573ce 
ffff880861445768 0000000000000086
  Feb 22 20:09:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8 
000000000000f598 ffff8808f15bba78
  Feb 22 20:09:14 virt11 kernel: Call Trace:
  Feb 22 20:09:14 virt11 kernel: [<ffffffff810573ce>] ? activate_task+0x2e/0x40
  Feb 22 20:09:14 virt11 kernel: [<ffffffff814dd755>] 
rwsem_down_failed_common+0x95/0x1d0
  Feb 22 20:09:14 virt11 kernel: [<ffffffff814dd8b3>] 
rwsem_down_write_failed+0x23/0x30
  Feb 22 20:09:14 virt11 kernel: [<ffffffff8126e573>] 
call_rwsem_down_write_failed+0x13/0x20
  Feb 22 20:09:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0 [xfs]
  Feb 22 20:09:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440 
[xfs]
  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0354116>] 
__xfs_get_blocks+0x86/0x200 [xfs]
  Feb 22 20:09:14 virt11 kernel: [<ffffffffa03542aa>] 
xfs_get_blocks_direct+0x1a/0x20 [xfs]
  Feb 22 20:09:14 virt11 kernel: [<ffffffff811ac132>] 
__blockdev_direct_IO+0x872/0xc40
  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0353f50>] 
xfs_vm_direct_IO+0xb0/0xf0 [xfs]
  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0354290>] ? 
xfs_get_blocks_direct+0x0/0x20 [xfs]
  Feb 22 20:09:14 virt11 kernel: [<ffffffffa0353cc0>] ? 
xfs_end_io_direct+0x0/0xe0 [xfs]
  Feb 22 20:09:14 virt11 kernel: [<ffffffff8106dd57>] ? 
current_fs_time+0x27/0x30
  Feb 22 20:09:14 virt11 kernel: [<ffffffff8110df22>] 
generic_file_direct_write+0xc2/0x190
  Feb 22 20:09:14 virt11 kernel: [<ffffffffa034bfcf>] ? 
xfs_trans_unlocked_item+0x4f/0x60 [xfs]
  Feb 22 20:09:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70 
[xfs]
  Feb 22 20:09:14 virt11 kernel: [<ffffffff8105dc72>] ? 
default_wake_function+0x12/0x20
  Feb 22 20:09:14 virt11 kernel: [<ffffffffa03599a1>] 
xfs_file_aio_write+0x61/0x70 [xfs]
  Feb 22 20:09:14 virt11 kernel: [<ffffffff8117241a>] do_sync_write+0xfa/0x140
  Feb 22 20:09:14 virt11 kernel: [<ffffffff8107fbc2>] ? send_signal+0x42/0x80
  Feb 22 20:09:14 virt11 kernel: [<ffffffff8108e160>] ? 
autoremove_wake_function+0x0/0x40
  Feb 22 20:09:14 virt11 kernel: [<ffffffff8107ff96>] ? 
group_send_sig_info+0x56/0x70
  Feb 22 20:09:14 virt11 kernel: [<ffffffff81211d3b>] ? 
selinux_file_permission+0xfb/0x150
  Feb 22 20:09:14 virt11 kernel: [<ffffffff812051a6>] ? 
security_file_permission+0x16/0x20
  Feb 22 20:09:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
  Feb 22 20:09:14 virt11 kernel: [<ffffffff810d1b62>] ? 
audit_syscall_entry+0x272/0x2a0
  Feb 22 20:09:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
  Feb 22 20:09:14 virt11 kernel: [<ffffffff8100b172>] 
system_call_fastpath+0x16/0x1b
  Feb 22 20:11:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more 
than 120 seconds.
  Feb 22 20:11:14 virt11 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Feb 22 20:11:14 virt11 kernel: qemu-kvm      D 0000000000000002     0 18360   
   1 0x00000080
  Feb 22 20:11:14 virt11 kernel: ffff8808614457e8 0000000000000086 
ffff8800282d5f80 ffff8800282d5f80
  Feb 22 20:11:14 virt11 kernel: ffff880861445768 ffffffff810573ce 
ffff880861445768 0000000000000086
  Feb 22 20:11:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8 
000000000000f598 ffff8808f15bba78
  Feb 22 20:11:14 virt11 kernel: Call Trace:
  Feb 22 20:11:14 virt11 kernel: [<ffffffff810573ce>] ? activate_task+0x2e/0x40
  Feb 22 20:11:14 virt11 kernel: [<ffffffff814dd755>] 
rwsem_down_failed_common+0x95/0x1d0
  Feb 22 20:11:14 virt11 kernel: [<ffffffff814dd8b3>] 
rwsem_down_write_failed+0x23/0x30
  Feb 22 20:11:14 virt11 kernel: [<ffffffff8126e573>] 
call_rwsem_down_write_failed+0x13/0x20
  Feb 22 20:11:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0 [xfs]
  Feb 22 20:11:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440 
[xfs]
  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0354116>] 
__xfs_get_blocks+0x86/0x200 [xfs]
  Feb 22 20:11:14 virt11 kernel: [<ffffffffa03542aa>] 
xfs_get_blocks_direct+0x1a/0x20 [xfs]
  Feb 22 20:11:14 virt11 kernel: [<ffffffff811ac132>] 
__blockdev_direct_IO+0x872/0xc40
  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0353f50>] 
xfs_vm_direct_IO+0xb0/0xf0 [xfs]
  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0354290>] ? 
xfs_get_blocks_direct+0x0/0x20 [xfs]
  Feb 22 20:11:14 virt11 kernel: [<ffffffffa0353cc0>] ? 
xfs_end_io_direct+0x0/0xe0 [xfs]
  Feb 22 20:11:14 virt11 kernel: [<ffffffff8106dd57>] ? 
current_fs_time+0x27/0x30
  Feb 22 20:11:14 virt11 kernel: [<ffffffff8110df22>] 
generic_file_direct_write+0xc2/0x190
  Feb 22 20:11:14 virt11 kernel: [<ffffffffa034bfcf>] ? 
xfs_trans_unlocked_item+0x4f/0x60 [xfs]
  Feb 22 20:11:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70 
[xfs]
  Feb 22 20:11:14 virt11 kernel: [<ffffffff8105dc72>] ? 
default_wake_function+0x12/0x20
  Feb 22 20:11:14 virt11 kernel: [<ffffffffa03599a1>] 
xfs_file_aio_write+0x61/0x70 [xfs]
  Feb 22 20:11:14 virt11 kernel: [<ffffffff8117241a>] do_sync_write+0xfa/0x140
  Feb 22 20:11:14 virt11 kernel: [<ffffffff8107fbc2>] ? send_signal+0x42/0x80
  Feb 22 20:11:14 virt11 kernel: [<ffffffff8108e160>] ? 
autoremove_wake_function+0x0/0x40
  Feb 22 20:11:14 virt11 kernel: [<ffffffff8107ff96>] ? 
group_send_sig_info+0x56/0x70
  Feb 22 20:11:14 virt11 kernel: [<ffffffff81211d3b>] ? 
selinux_file_permission+0xfb/0x150
  Feb 22 20:11:14 virt11 kernel: [<ffffffff812051a6>] ? 
security_file_permission+0x16/0x20
  Feb 22 20:11:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
  Feb 22 20:11:14 virt11 kernel: [<ffffffff810d1b62>] ? 
audit_syscall_entry+0x272/0x2a0
  Feb 22 20:11:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
  Feb 22 20:11:14 virt11 kernel: [<ffffffff8100b172>] 
system_call_fastpath+0x16/0x1b
  Feb 22 20:13:14 virt11 kernel: INFO: task qemu-kvm:18360 blocked for more 
than 120 seconds.
  Feb 22 20:13:14 virt11 kernel: "echo 0 > 
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Feb 22 20:13:14 virt11 kernel: qemu-kvm      D 0000000000000002     0 18360   
   1 0x00000080
  Feb 22 20:13:14 virt11 kernel: ffff8808614457e8 0000000000000086 
ffff8800282d5f80 ffff8800282d5f80
  Feb 22 20:13:14 virt11 kernel: ffff880861445768 ffffffff810573ce 
ffff880861445768 0000000000000086
  Feb 22 20:13:14 virt11 kernel: ffff8808f15bba78 ffff880861445fd8 
000000000000f598 ffff8808f15bba78
  Feb 22 20:13:14 virt11 kernel: Call Trace:
  Feb 22 20:13:14 virt11 kernel: [<ffffffff810573ce>] ? activate_task+0x2e/0x40
  Feb 22 20:13:14 virt11 kernel: [<ffffffff814dd755>] 
rwsem_down_failed_common+0x95/0x1d0
  Feb 22 20:13:14 virt11 kernel: [<ffffffff814dd8b3>] 
rwsem_down_write_failed+0x23/0x30
  Feb 22 20:13:14 virt11 kernel: [<ffffffff8126e573>] 
call_rwsem_down_write_failed+0x13/0x20
  Feb 22 20:13:14 virt11 kernel: [<ffffffff814dcdb2>] ? down_write+0x32/0x40
  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0332d6e>] xfs_ilock+0x7e/0xd0 [xfs]
  Feb 22 20:13:14 virt11 kernel: [<ffffffffa033ab02>] xfs_iomap+0x2e2/0x440 
[xfs]
  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0354116>] 
__xfs_get_blocks+0x86/0x200 [xfs]
  Feb 22 20:13:14 virt11 kernel: [<ffffffffa03542aa>] 
xfs_get_blocks_direct+0x1a/0x20 [xfs]
  Feb 22 20:13:14 virt11 kernel: [<ffffffff811ac132>] 
__blockdev_direct_IO+0x872/0xc40
  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0353f50>] 
xfs_vm_direct_IO+0xb0/0xf0 [xfs]
  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0354290>] ? 
xfs_get_blocks_direct+0x0/0x20 [xfs]
  Feb 22 20:13:14 virt11 kernel: [<ffffffffa0353cc0>] ? 
xfs_end_io_direct+0x0/0xe0 [xfs]
  Feb 22 20:13:14 virt11 kernel: [<ffffffff8106dd57>] ? 
current_fs_time+0x27/0x30
  Feb 22 20:13:14 virt11 kernel: [<ffffffff8110df22>] 
generic_file_direct_write+0xc2/0x190
  Feb 22 20:13:14 virt11 kernel: [<ffffffffa034bfcf>] ? 
xfs_trans_unlocked_item+0x4f/0x60 [xfs]
  Feb 22 20:13:14 virt11 kernel: [<ffffffffa035dd1d>] xfs_write+0x4fd/0xb70 
[xfs]
  Feb 22 20:13:14 virt11 kernel: [<ffffffff8105dc72>] ? 
default_wake_function+0x12/0x20
  Feb 22 20:13:14 virt11 kernel: [<ffffffffa03599a1>] 
xfs_file_aio_write+0x61/0x70 [xfs]
  Feb 22 20:13:14 virt11 kernel: [<ffffffff8117241a>] do_sync_write+0xfa/0x140
  Feb 22 20:13:14 virt11 kernel: [<ffffffff8107fbc2>] ? send_signal+0x42/0x80
  Feb 22 20:13:14 virt11 kernel: [<ffffffff8108e160>] ? 
autoremove_wake_function+0x0/0x40
  Feb 22 20:13:14 virt11 kernel: [<ffffffff8107ff96>] ? 
group_send_sig_info+0x56/0x70
  Feb 22 20:13:14 virt11 kernel: [<ffffffff81211d3b>] ? 
selinux_file_permission+0xfb/0x150
  Feb 22 20:13:14 virt11 kernel: [<ffffffff812051a6>] ? 
security_file_permission+0x16/0x20
  Feb 22 20:13:14 virt11 kernel: [<ffffffff81172718>] vfs_write+0xb8/0x1a0
  Feb 22 20:13:14 virt11 kernel: [<ffffffff810d1b62>] ? 
audit_syscall_entry+0x272/0x2a0
  Feb 22 20:13:14 virt11 kernel: [<ffffffff81173212>] sys_pwrite64+0x82/0xa0
  Feb 22 20:13:14 virt11 kernel: [<ffffffff8100b172>] 
system_call_fastpath+0x16/0x1b

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