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Re: [sysvinit-devel] [Question] A panic when reboot --force the system


From: Matias A. Fonzo
Subject: Re: [sysvinit-devel] [Question] A panic when reboot --force the system
Date: Mon, 26 Oct 2015 19:04:08 -0300

El Fri, 23 Oct 2015 17:45:57 +0800
Rui Xiang <address@hidden> escribi├│:
> Hi´╝îlist
> 
> I encounter a panic about init process.
> 
> Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x00000007
> 
> Pid: 1, comm: init Tainted: G  R        O 3.4.24.19-0.11-default #1
> Call Trace:
>  [<ffffffff8144dd24>] panic+0xc1/0x1e2
>  [<ffffffff8104483b>] do_exit+0x7db/0x8d0
>  [<ffffffff81044c7a>] do_group_exit+0x3a/0xa0
>  [<ffffffff8105394b>] get_signal_to_deliver+0x1ab/0x5e0
>  [<ffffffff81002270>] do_signal+0x60/0x5f0
>  [<ffffffff8145bf97>] ? do_page_fault+0x4a7/0x4d0
>  [<ffffffff81170d2c>] ? poll_select_copy_remaining+0xec/0x140
>  [<ffffffff81002885>] do_notify_resume+0x65/0x80
>  [<ffffffff8124ca7e>] ? trace_hardirqs_on_thunk+0x3a/0x3c
>  [<ffffffff814587ab>] retint_signal+0x4d/0x92
> 
> The system has a little memory left, then reboot it, and get the
> panic.
> 

Have you tried?:

  1. Deleting the file etc/ld.so.cache
  2. Doing a `sync'
  3. Reboot

> In our host, kswapd would be wake up while using a lot of memory, and
> then reclaim some pages from init process. If we execute *"reboot"*
> or *"reboot -f"* to reboot host through sysvinit, reboot process will
> call sys_reboot and shut down the sas driver(disk), then will trigger
> the panic of init process.
> 
> As follow,
> 
>               HOST                                    reboot
> process                       init process use a lot of memory
>  wake up kswapd
>    reclaim some pages
>    (these pages are code segment
>       or data segment of init process)
>    from init thread (pid=1)
>                                                               reboot
>                                                                 sys_reboot
>                                                                       shutdown
> disk driver init thread read data from disk
>                                                                               
>                                   page_fault
>                                                                               
>                                         filemap_fault
>                                                                               
>                                           readpage
> failed because the disk is closed return VM_FAULT_SIGBUS
>                                                                               
>                                         send
> signal SIGBUS do_signal
>                                                                               
>                                         do_exit
>                                                                               
>                                         trigger
> the panic
> 
> 
> It seems that reboot or force reboot through *sysvinit* have the
> problem. Furthermore, using reboot -f in *systemd* should also have
> this problem, right?
> 
> And is that a bug for current reboot process in sysvinit or systemd?
> 
> All comments are welcome, thanks.
> 
> 



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