Bug#777735: systemd: Disk corruption on reboot initiated through systemd

[Michael Biebl]

Am 12.02.2015 um 08:31 schrieb Michael Biebl:
> Am 12.02.2015 um 07:34 schrieb Michael Biebl:
>> Am 12.02.2015 um 07:29 schrieb Peter Colberg:
>>> On Thu, Feb 12, 2015 at 07:14:05AM +0100, Michael Biebl wrote:
>>
>>> It is curious that the bug only manifests itself with the qemu watchdog.
>>> Two physical machines using the hardware iTCO_wdt watchdog reboot fine.
>>
>> In my tests, I did indeed have an unclean shutdown, and got an fsck on
>> next boot. Which looks to me, as if the watchdog i.e. qemu resets the VM
>> before it can shutdown cleanly.
> 
> A "systemctl poweroff" does not seem to trigger this issue. In that
> case, the system is properly shutdown.
> Only on "systemctl reboot" I'm to reproduce the problem, that the VM is
> reset after having reached the shutdown target.
> 
> With poweroff it looks like this (dump from the serial console log)
> 

...

> Note this line:
> [    9.402243] i6300esb: Unexpected close, not stopping watchdog!

Some more findings: Aside from only happening on reboot, but not
shutdown, it also seems to only happen with i6300esb. Switching the qemu
config to use ib700 instead of i6300esb, I am not able to trigger the
problem. This confirm's Peter's findings who was not able to reproduce
it on real hardware.

I wonder, if this is a qemu issue, after all?

CCing our Debian qemu maintainer. Maybe he has some insight on this
matter (the complete bug log is at [1]).

Michael

[1] http://bugs.debian.org/777735

-- 
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