On 2020-03-26 18:28, syzbot wrote:

syzbot has bisected this bug to:

commit 768134d4f48109b90f4248feecbeeb7d684e410c Author: Jens Axboe axboe@kernel.dk Date: Mon Nov 11 03:30:53 2019 +0000

io_uring: don't do flush cancel under inflight_lock

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14233ef5e00000 start commit: 1b649e0b Merge git://git.kernel.org/pub/scm/linux/kernel/g.. git tree: upstream final crash: https://syzkaller.appspot.com/x/report.txt?x=16233ef5e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=12233ef5e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=27392dd2975fd692 dashboard link: https://syzkaller.appspot.com/bug?extid=313d95e8a7a49263f88d syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13850447e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=119a26f5e00000

Reported-by: syzbot+313d95e8a7a49263f88d@syzkaller.appspotmail.com Fixes: 768134d4f481 ("io_uring: don't do flush cancel under inflight_lock")

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

#syz fix: blk-mq: Fix a recently introduced regression in blk_mq_realloc_hw_ctxs()