[LTP] next-20250915: LTP chdir01 df01_sh stat04 tst_device.c:97: TBROK: Could not stat loop device 0

[Jan Kara]

On Tue 16-09-25 13:04:42, Jan Kara wrote:
> On Tue 16-09-25 12:57:26, Naresh Kamboju wrote:
> > The following LTP chdir01 df01_sh and stat04 tests failed on the rock-pi-4b
> > qemu-arm64 on the Linux next-20250915 tag build.
> > 
> > First seen on next-20250915
> > Good: next-20250912
> > Bad: next-20250915
> > 
> > Regression Analysis:
> > - New regression? yes
> > - Reproducibility? yes
> > 
> > * rk3399-rock-pi-4b, ltp-smoke
> > * qemu-arm64, ltp-smoke
> > * qemu-arm64-compat, ltp-smoke
> >  - chdir01
> >   - df01_sh
> >   - stat04
> > 
> > Test regression: next-20250915: LTP chdir01 df01_sh stat04
> > tst_device.c:97: TBROK: Could not stat loop device 0
> 
> This is really strange. Those failing tests all start to complain that
> /dev/loop0 doesn't exist (open gets ENOENT)... The fact that this is
> limited to only a few archs suggests it's some race somewhere but I don't
> see any relevant changes in linux-block in last three days...

Ha, Mark Brown tracked this [1] to changes in VFS tree in
extensible_ioctl_valid(). More discussion there I guess.

[1] https://lore.kernel.org/all/02da33e3-6583-4344-892f-a9784b9c5b1b@sirena.org.uk

								Honza

-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR