linux-kernel - Re: [syzbot] [kernfs?] possible deadlock in kernfs_seq

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Date: Wed, 08 May 2024 08:13:03 -0700
From: syzbot <syzbot+4c493dcd5a68168a94b2@...kaller.appspotmail.com>
To: axboe@...nel.dk, gregkh@...uxfoundation.org, hch@....de, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-unionfs@...r.kernel.org, miklos@...redi.hu, rafael@...nel.org, 
	syzkaller-bugs@...glegroups.com, tj@...nel.org
Subject: Re: [syzbot] [kernfs?] possible deadlock in kernfs_seq_start

syzbot has bisected this issue to:

commit 1e8c813b083c4122dfeaa5c3b11028331026e85d
Author: Christoph Hellwig <hch@....de>
Date:   Wed May 31 12:55:32 2023 +0000

    PM: hibernate: don't use early_lookup_bdev in resume_store

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1380072f180000
start commit:   dccb07f2914c Merge tag 'for-6.9-rc7-tag' of git://git.kern..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1040072f180000
console output: https://syzkaller.appspot.com/x/log.txt?x=1780072f180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9d7ea7de0cb32587
dashboard link: https://syzkaller.appspot.com/bug?extid=4c493dcd5a68168a94b2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1134f3c0980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1367a504980000

Reported-by: syzbot+4c493dcd5a68168a94b2@...kaller.appspotmail.com
Fixes: 1e8c813b083c ("PM: hibernate: don't use early_lookup_bdev in resume_store")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection