Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi

[Zhangfei Gao]

Hi, Jan

On Wed, Jul 27, 2016 at 11:56 PM, Jan Kara <address@hidden> wrote:
> Hi!
>
> On Wed 27-07-16 15:58:55, Zhangfei Gao wrote:
>> Hi, Michael
>>
>> I have met ext4 error when using vhost_scsi on arm64 platform, and
>> suspect it is vhost_scsi issue.
>>
>> Ext4 error when testing virtio_scsi & vhost_scsi
>>
>>
>> No issue:
>> 1. virtio_scsi, ext4
>> 2. vhost_scsi & virtio_scsi, ext2
>> 3.  Instead of vhost, also tried loopback and no problem.
>> Using loopback, host can use the new block device, while vhost is used
>> by guest (qemu).
>> http://www.linux-iscsi.org/wiki/Tcm_loop
>> Test directly in host, not find ext4 error.
>>
>>
>>
>> Have issue:
>> 1. vhost_scsi & virtio_scsi, ext4
>> a. iblock
>> b, fileio, file located in /tmp (ram), no device based.
>>
>> 2, Have tried 4.7-r2 and 4.5-rc1 on D02 board, both have issue.
>> Since I need kvm specific patch for D02, so it may not freely to switch
>> to older version.
>>
>> 3. Also test with ext4, disabling journal
>> mkfs.ext4 -O ^has_journal /dev/sda
>>
>>
>> Do you have any suggestion?
>
> So can you mount the filesystem with errors=remount-ro to avoid clobbering
> the fs after the problem happens? And then run e2fsck on the problematic
> filesystem and send the output here?
>

Tested twice, log pasted.
Both using fileio, located in host ramfs /tmp
Before e2fsck, umount /dev/sda

1.
root@(none)$ mount -o errors=remount-ro /dev/sda /mnt
[   22.812053] EXT4-fs (sda): mounted filesystem with ordered data
mode. Opts: errors=remount-ro
$ rm /mnt/test
[  108.388905] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5362: Corrupt filesystem
[  108.406930] Aborting journal on device sda-8.
[  108.414120] EXT4-fs (sda): Remounting filesystem read-only
[  108.414847] EXT4-fs error (device sda) in ext4_dirty_inode:5487: IO failure
[  108.423571] EXT4-fs error (device sda) in ext4_free_blocks:4904:
Journal has aborted
[  108.431919] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5362: Corrupt filesystem
[  108.440269] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5362: Corrupt filesystem
[  108.448568] EXT4-fs error (device sda) in
ext4_ext_remove_space:3058: IO failure
[  108.456917] EXT4-fs error (device sda) in ext4_ext_truncate:4657:
Corrupt filesystem
[  108.465267] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5362: Corrupt filesystem
[  108.473567] EXT4-fs error (device sda) in ext4_truncate:4150: IO failure
[  108.481917] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5362: Corrupt filesystem
root@(none)$ e2fsck /dev/sda
e2fsck 1.42.9 (28-Dec-2013)
/dev/sda is mounted.
e2fsck: Cannot continue, aborting.


root@(none)$ umount /mnt
[  260.756250] EXT4-fs error (device sda): ext4_put_super:837:
Couldn't clean up the journal
root@(none)$ umount /mnt           e2fsck /dev/sda
e2fsck 1.42.9 (28-Dec-2013)
ext2fs_open2: Bad magic number in super-block
e2fsck: Superblock invalid, trying backup blocks...
Superblock needs_recovery flag is clear, but journal has data.
Recovery flag not set in backup superblock, so running journal anyway.
/dev/sda: recovering journal
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Free blocks count wrong for group #1 (32703, counted=8127).
Fix<y>? yes
Free blocks count wrong for group #2 (32768, counted=31744).
Fix<y>? yes
Free blocks count wrong (249509, counted=223909).
Fix<y>? yes
Free inodes count wrong for group #0 (8181, counted=8180).
Fix<y>? yes
Free inodes count wrong (65525, counted=65524).
Fix<y>? yes

/dev/sda: ***** FILE SYSTEM WAS MODIFIED *****
/dev/sda: 12/65536 files (8.3% non-contiguous), 38235/262144 blocks
root@(none)$

2.

 root@(none)$ rm /mnt/test
[   71.021484] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5362: Corrupt filesystem
[   71.044959] Aborting journal on device sda-8.
[   71.052152] EXT4-fs (sda): Remounting filesystem read-only
[   71.052833] EXT4-fs error (device sda) in ext4_dirty_inode:5487: IO failure
[   71.061600] EXT4-fs error (device sda) in ext4_free_blocks:4904:
Journal has aborted
[   71.069948] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5362: Corrupt filesystem
[   71.078296] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5362: Corrupt filesystem
[   71.086597] EXT4-fs error (device sda) in
ext4_ext_remove_space:3058: IO failure
[   71.094946] EXT4-fs error (device sda) in ext4_ext_truncate:4657:
Corrupt filesystem
[   71.103296] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5362: Corrupt filesystem
[   71.111595] EXT4-fs error (device sda) in ext4_truncate:4150: IO failure
[   71.119946] EXT4-fs error (device sda) in
ext4_reserve_inode_write:5362: Corrupt filesystem
root@(none)$ e2fsck /dev/sda
e2fsck 1.42.9 (28-Dec-2013)
/dev/sda is mounted.
e2fsck: Cannot continue, aborting.


root@(none)$ umou nt /mnt/
[   92.103221] EXT4-fs error (device sda): ext4_put_super:837:
Couldn't clean up the journal
root@(none)$ umount /mnt/            e2fsck /dev/sda
e2fsck 1.42.9 (28-Dec-2013)
ext2fs_open2: Bad magic number in super-block
e2fsck: Superblock invalid, trying backup blocks...
Superblock needs_recovery flag is clear, but journal has data.
Recovery flag not set in backup superblock, so running journal anyway.
/dev/sda: recovering journal
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Free blocks count wrong for group #1 (32703, counted=8127).
Fix<y>? yes
Free blocks count wrong for group #2 (32768, counted=31744).
Fix<y>? yes
Free blocks count wrong (249509, counted=223909).
Fix<y>? yes
Free inodes count wrong for group #0 (8181, counted=8180).
Fix<y>? yes
Free inodes count wrong (65525, counted=65524).
Fix<y>? yes

/dev/sda: ***** FILE SYSTEM WAS MODIFIED *****
/dev/sda: 12/65536 files (8.3% non-contiguous), 38235/262144 blocks
root@(none)$


Thanks