Re: Flaky test: generic:269 (EBUSY on umount)

["Darrick J. Wong" <djwong@kernel.org>]

On Fri, Jun 14, 2024 at 07:27:59PM +0100, Theodore Ts'o wrote:
> On Thu, Jun 13, 2024 at 09:16:18PM -0700, Darrick J. Wong wrote:
> > 
> > Amusingly enough, I still have that patch (and generic/1220) in my
> > fstests branch, and I haven't seen this problem happen on g/1220 in
> > quite a while.
> 
> Remind me what your fstests git repo is again?

https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfstests-dev.git/log/?h=djwong-wtf

> The generic/750 test in my patch 2/2 that I sent out reproduces the
> problem super-reliably, so long as fsstress actually issues the
> io_uring reads and writes.  So if you have your patch applied which
> suppresses io_uring from fstress by default, you might need to modify
> the patch series to force the io_uring, at which point it quite nicely
> demonstrates the fsstress ; umount problem.  (It sometimes requires
> more rounds of fsstress ; umounts before it repro's on the xfs/4k, but
> it repro's really nicely on ext4/4k).

Hm, your g/750 test mounts and unmounts in a loop, which might be why
mine hasn't tripped yet.  I'll try applying it and report back.

--D
> 
> xfs/4k:
>   generic/750  Failed   3s
>   generic/750  Failed   1s
>   generic/750  Failed   33s
>   generic/750  Failed   1s
>   generic/750  Pass     33s
> ext4/4k:
>   generic/750  Failed   3s
>   generic/750  Failed   2s
>   generic/750  Failed   7s
>   generic/750  Failed   2s
>   generic/750  Failed   7s
> 
> 							- Ted
>