linux-kernel - Re: WARNING: ODEBUG bug in io_sqe_files

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Date:   Sat, 21 Dec 2019 09:49:01 -0800
From:   syzbot <syzbot+6bf913476056cb0f8d13@...kaller.appspotmail.com>
To:     axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: Re: WARNING: ODEBUG bug in io_sqe_files_unregister

syzbot has bisected this bug to:

commit cbb537634780172137459dead490d668d437ef4d
Author: Jens Axboe <axboe@...nel.dk>
Date:   Mon Dec 9 18:22:50 2019 +0000

     io_uring: avoid ring quiesce for fixed file set unregister and update

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10eadc56e00000
start commit:   7ddd09fc Add linux-next specific files for 20191220
git tree:       linux-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=12eadc56e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=14eadc56e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f183b01c3088afc6
dashboard link: https://syzkaller.appspot.com/bug?extid=6bf913476056cb0f8d13
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15653c3ee00000

Reported-by: syzbot+6bf913476056cb0f8d13@...kaller.appspotmail.com
Fixes: cbb537634780 ("io_uring: avoid ring quiesce for fixed file set  
unregister and update")

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