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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> escribió:
> Hi,list
>
> 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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