linux-kernel - Re: [syzbot] [gfs2] WARNING in vfs

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Message-ID: <CAHc6FU7R+mb3Eh11oOfvDVNg-Zsb-zE9CLEhr4yDKJKU5+ABHA@mail.gmail.com>
Date:   Wed, 13 Dec 2023 16:10:18 +0100
From:   Andreas Gruenbacher <agruenba@...hat.com>
To:     Christian Brauner <brauner@...nel.org>
Cc:     xingwei lee <xrivendell7@...il.com>,
        syzbot+0c64a8706d587f73409e@...kaller.appspotmail.com,
        gfs2@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: Re: [syzbot] [gfs2] WARNING in vfs_utimes

On Wed, Dec 13, 2023 at 11:45 AM Christian Brauner <brauner@...nel.org> wrote:
> On Wed, Dec 13, 2023 at 02:35:58PM +0800, xingwei lee wrote:
> > Hello, I reproduced this bug with repro.c and repro.txt since it
> > relatively large please see
> > https://gist.github.com/xrivendell7/b3b804bbf6d8c9930b2ba22e2dfaa6e6
> >
> > Since this bug in the dashboard
> > https://syzkaller.appspot.com/bug?extid=0c64a8706d587f73409e use
> > kernel commit: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?id=aed8aee11130a954356200afa3f1b8753e8a9482
> > kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=df91a3034fe3f122
> >
> > my repro.c use the seem config and it crash report like below, and
> > it’s almost can make sure it the same as bug reported by syzobt.
>
> Uh, can you reproduce this on mainline?
> I so far fail to even with your repro.

I regularly run afoul of not running "losetup -f" before these
reproducers and so they end up doing nothing; see here:

https://lore.kernel.org/all/CAHc6FU7b-BaBXrMR3UqbZGF3a_y=20TKkCNde1GvqbmN2-h1xw@mail.gmail.com/

Andreas