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SubjectRe: [syzbot] [ext4?] WARNING in mb_cache_destroy
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syzbot has bisected this issue to:

commit 67d7d8ad99beccd9fe92d585b87f1760dc9018e3
Author: Baokun Li <libaokun1@huawei.com>
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@syzkaller.appspotmail.com
Fixes: 67d7d8ad99be ("ext4: fix use-after-free in ext4_xattr_set_entry")

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

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