Re: [syzbot] [kernfs?] possible deadlock in kernfs_fop_llseek

[syzbot <syzbot+9a5b0ced8b1bfb238b56@syzkaller.appspotmail.com>]

syzbot has bisected this issue to:

commit 0fedefd4c4e33dd24f726b13b5d7c143e2b483be
Author: Valentine Sinitsyn <valesini@yandex-team.ru>
Date:   Mon Sep 25 08:40:12 2023 +0000

    kernfs: sysfs: support custom llseek method for sysfs entries

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17cb5e03180000
start commit:   fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=142b5e03180000
console output: https://syzkaller.appspot.com/x/log.txt?x=102b5e03180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4d90a36f0cab495a
dashboard link: https://syzkaller.appspot.com/bug?extid=9a5b0ced8b1bfb238b56
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17f1d93d180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15c38139180000

Reported-by: syzbot+9a5b0ced8b1bfb238b56@syzkaller.appspotmail.com
Fixes: 0fedefd4c4e3 ("kernfs: sysfs: support custom llseek method for sysfs entries")

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