Re: [syzbot] [fs?] WARNING in brelse

[syzbot]

syzbot has bisected this issue to:

commit f6e2c20ca7604e6a267c93a511d19dda72573be1
Author: Liu Shixin <liushixin2@xxxxxxxxxx>
Date:   Fri Apr 29 21:38:04 2022 +0000

    fs: sysv: check sbi->s_firstdatazone in complete_read_super

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15e8976da80000
start commit:   77856d911a8c Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17e8976da80000
console output: https://syzkaller.appspot.com/x/log.txt?x=13e8976da80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f967143badd2fa39
dashboard link: https://syzkaller.appspot.com/bug?extid=2a0fbd1cb355de983130
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11393ab3880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12a2a99d880000

Reported-by: syzbot+2a0fbd1cb355de983130@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: f6e2c20ca760 ("fs: sysv: check sbi->s_firstdatazone in complete_read_super")

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