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Bug#964494: File system corruption with ext3 + kernel-4.19.0-9-amd64

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On 7/20/20 11:24 AM, Hans van Kranenburg wrote:
> Hi,
> 
> On Wed, 15 Jul 2020 20:52:40 -0700 Sarah Newman <srn@prgmr.com> wrote:
>> On 7/7/20 8:13 PM, Ben Hutchings wrote:
>>> Control: reassign -1 src:linux
>>> Control: tag -1 moreinfo
>>>
>>> On Tue, 2020-07-07 at 17:30 -0700, Sarah Newman wrote:
>>>> Package: linux-signed-amd64
>>>> Version: 4.19.0-9-amd64
>>>>
>>>> We've had two separate reports now of debian buster users running
>>>> 4.19.0-9-amd64 who experienced serious file system corruption.
>>>
>>> Which version?  (I.e. what does "uname -v" or
>>> "dpkg -s linux-image-4.19.0-9-amd64" say?)
>>>
>>>> - Both were using ext3
>>>> - Both are running Xen HVM, but I do not have reason to believe this to be related
>>
>> [...]
> 
> I have servers which run 4.19.118-2 as dom0 kernel and a Xen 4.11.4-1
> rebuild for Buster.
> 
> One example is a smallish 6-server cluster that got a reboot cycle 48
> days ago.
> 
> It contains a few heavily loaded domUs with 4.19.118 or 4.19.131 based
> kernels.
> 
> No problems or disk corruption or anything is seen yet. dom0 filesystem
> is ext4, domUs use a mix of ext4 and btrfs (over iscsi). So, no ext3
> anywhere.
> 
> We haven't got bug reports against Debian Xen packages in the BTS about
> this.
> 
> I have not yet tried to make an ext3 fs on a block device in a test domU
> and then have it do things with the fs and reboot it now and then. If
> wanted, I can do that and see if there's any problem after a week or
> two. Just to add chaos to help correlating.
> 
> FWIW,
> Hans
> 

We've had 9 reports of users running 4.19.0-9-amd64 total, only 2 with ext3, no uptimes longer than maybe 5 weeks for the ext3 + 4.19.0-9-amd64 users. 
No more reported failures.

Our attempts to reproduce so far have not been successful, but that might be because we were running a debug kernel build and I think there may have 
been a deadlock in between depot_lock and console_owner which killed the tests.

I'm not sure what the next steps are here, but it sounds like ext4 has not shown any problems.

--Sarah

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Bug#964494: File system corruption with ext3 + kernel-4.19.0-9-amd64 Sarah Newman <srn@prgmr.com> - 2020-07-08 02:40 +0200
  Processed: Re: Bug#964494: File system corruption with ext3 +  kernel-4.19.0-9-amd64 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2020-07-08 05:20 +0200
  Bug#964494: File system corruption with ext3 + kernel-4.19.0-9-amd64 Ben Hutchings <ben@decadent.org.uk> - 2020-07-08 05:20 +0200
    Bug#964494: File system corruption with ext3 + kernel-4.19.0-9-amd64 Sarah Newman <srn@prgmr.com> - 2020-07-09 00:50 +0200
  Bug#964494: File system corruption with ext3 + kernel-4.19.0-9-amd64 Sarah Newman <srn@prgmr.com> - 2020-07-28 00:20 +0200
  Bug#964494: Info received (Bug#964494: File system corruption with ext3 + kernel-4.19.0-9-amd64) Sarah Newman <srn@prgmr.com> - 2020-08-19 07:10 +0200

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