Re: [syzbot] [ext4?] WARNING in mb_cache_destroy

[syzbot]

syzbot has bisected this issue to:

commit 67d7d8ad99beccd9fe92d585b87f1760dc9018e3
Author: Baokun Li <libaokun1@xxxxxxxxxx>
Date:   Thu Jun 16 02:13:56 2022 +0000

    ext4: fix use-after-free in ext4_xattr_set_entry

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1011bcf8980000
start commit:   b947cc5bf6d7 Merge tag 'erofs-for-6.9-rc7-fixes' of git://..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1211bcf8980000
console output: https://syzkaller.appspot.com/x/log.txt?x=1411bcf8980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d2f00edef461175
dashboard link: https://syzkaller.appspot.com/bug?extid=dd43bd0f7474512edc47
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11d2957f180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1620ca40980000

Reported-by: syzbot+dd43bd0f7474512edc47@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 67d7d8ad99be ("ext4: fix use-after-free in ext4_xattr_set_entry")

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