linux-kernel - Re: possible deadlock in io_submit

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Date:   Mon, 11 Mar 2019 06:23:00 -0700
From:   syzbot <syzbot+a3accb352f9c22041cfa@...kaller.appspotmail.com>
To:     adam.manzanares@....com, avi@...lladb.com, bcrl@...ck.org,
        darrick.wong@...cle.com, gregkh@...uxfoundation.org, 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 io_submit_one

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=108886bd200000
start commit:   bfe4037e aio: implement IOCB_CMD_POLL
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=128886bd200000
console output: https://syzkaller.appspot.com/x/log.txt?x=148886bd200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2e0064f906afee10
dashboard link: https://syzkaller.appspot.com/bug?extid=a3accb352f9c22041cfa
userspace arch: amd64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=156479f8c00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=128c75c4c00000

Reported-by: syzbot+a3accb352f9c22041cfa@...kaller.appspotmail.com
Fixes: bfe4037e ("aio: implement IOCB_CMD_POLL")