Re: generic/232 test failures on 4.14-rc1

Jan Kara
2017-09-25T13:59:48Z

On Thu 21-09-17 11:48:46, Eric Whitney wrote:
> I'm seeing generic/232 fail from time to time when running a 4.14-rc1 kernel
> on xfstest-bld's most recent kvm-xfstests test appliance. In one set of
> trials, it failed in the same manner 4 out of 10 times when running the 4k test
> configuration for ext4.
>
> The failure bisects to "quota: Do not acquire dqio_sem for dquot overwrites in
> v2 format" (ab2b86360f6e). When this patch was reverted in a 4.14-rc1 kernel,
> the failure did not reoccur in a series of 20 trials.

Thanks for debugging this! I'd just note that the commit hash of that
change is different for me - d2faa415166b2883428efa92f451774ef44373ac.

> Example output from the failed test:
>
> QA output created by 232
>
> Testing fsstress
>
> seed = S
> Comparing user usage
> 218a219
> > #3740 -- 4 0 0 1 0 0
> 245a247
> > #45 -- 0 0 0 1 0 0
>
> Note: I'm also seeing a similar failure for generic/233, but the patch
> containing the root cause likely comes somewhere after ab2b86360f6e. I'll post
> another bug report once I locate it.

I'll try to debug this further. Thanks for report!