linux-kernel - Re: [syzbot] [sysv?] [vfs?] WARNING in invalidate_bh

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Date:   Sun, 30 Apr 2023 02:40:22 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     syzbot <syzbot+9743a41f74f00e50fc77@...kaller.appspotmail.com>
Cc:     hch@...radead.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: Re: [syzbot] [sysv?] [vfs?] WARNING in invalidate_bh_lru

On Wed, Dec 21, 2022 at 06:57:38PM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    a5541c0811a0 Merge branch 'for-next/core' into for-kernelci
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=1560b830480000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=cbd4e584773e9397
> dashboard link: https://syzkaller.appspot.com/bug?extid=9743a41f74f00e50fc77
> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> userspace arch: arm64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15e320b3880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=147c0577880000

#syz set subsystems: sysv, udf

There are two reproducers, one that mounts a sysv file system, and the
other which mounts a udf file system.  There is no mention of ext4 in
the stack trace, and yet syzbot has assigned this to the ext4
subsystem for some unknown reason.

					- Ted