linux-kernel - Re: possible deadlock in userfaultfd

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Message-ID: <0000000000005e71740584a999d1@google.com>
Date:   Fri, 22 Mar 2019 00:14:00 -0700
From:   syzbot <syzbot+53c0b767f7ca0dc0c451@...kaller.appspotmail.com>
To:     adam.manzanares@....com, avi@...lladb.com, bcrl@...ck.org,
        darrick.wong@...cle.com, hch@....de, jmoyer@...hat.com,
        linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: Re: possible deadlock in userfaultfd_release

syzbot has bisected this bug to:

commit bfe4037e722ec672c9dafd5730d9132afeeb76e9
Author: Christoph Hellwig <hch@....de>
Date:   Mon Jul 16 07:08:20 2018 +0000

     aio: implement IOCB_CMD_POLL

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1382985d200000
start commit:   bfe4037e aio: implement IOCB_CMD_POLL
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=1042985d200000
console output: https://syzkaller.appspot.com/x/log.txt?x=1782985d200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5c0a49d2b5210087
dashboard link: https://syzkaller.appspot.com/bug?extid=53c0b767f7ca0dc0c451
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1111f2eb400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13e874f5400000

Reported-by: syzbot+53c0b767f7ca0dc0c451@...kaller.appspotmail.com
Fixes: bfe4037e722e ("aio: implement IOCB_CMD_POLL")

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