linux-kernel - Re: next-20250915: LTP chdir01 df01_sh stat04 tst_device.c:97: TBROK: Could not stat loop device 0

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Message-ID: <h3ov4pformuvguwsxtziqui2alarqno37kdru4bjsppeok4sth@yb4iposv7okd>
Date: Tue, 16 Sep 2025 13:34:16 +0200
From: Jan Kara <jack@...e.cz>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: linux-block <linux-block@...r.kernel.org>, 
	linux-fsdevel@...r.kernel.org, LTP List <ltp@...ts.linux.it>, 
	open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>, Christian Brauner <brauner@...nel.org>, 
	chrubis <chrubis@...e.cz>, Petr Vorel <pvorel@...e.cz>, Arnd Bergmann <arnd@...db.de>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Al Viro <viro@...iv.linux.org.uk>, 
	Amir Goldstein <amir73il@...il.com>, Jan Kara <jack@...e.cz>, 
	"Martin K. Petersen" <martin.petersen@...cle.com>, Anuj Gupta <anuj20.g@...sung.com>, 
	Kanchan Joshi <joshi.k@...sung.com>, Anders Roxell <anders.roxell@...aro.org>, 
	Ben Copeland <benjamin.copeland@...aro.org>
Subject: Re: next-20250915: LTP chdir01 df01_sh stat04 tst_device.c:97:
 TBROK: Could not stat loop device 0

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@...e.com>
SUSE Labs, CR