linux-kernel - Re: [syzbot] WARNING in io_ring_exit

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Date:   Fri, 06 Aug 2021 08:21:14 -0700
From:   syzbot <syzbot+00e15cda746c5bc70e24@...kaller.appspotmail.com>
To:     asml.silence@...il.com, axboe@...nel.dk,
        gregkh@...uxfoundation.org, hdanton@...a.com,
        io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
        rafael@...nel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in io_ring_exit_work

syzbot has bisected this issue to:

commit 6c2450ae55656f6b0370bfd4cb52ec8a4ecd0916
Author: Pavel Begunkov <asml.silence@...il.com>
Date:   Tue Feb 23 12:40:22 2021 +0000

    io_uring: allocate memory for overflowed CQEs

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=138a96e6300000
start commit:   8d4b477da1a8 Add linux-next specific files for 20210730
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=104a96e6300000
console output: https://syzkaller.appspot.com/x/log.txt?x=178a96e6300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4adf4987f875c210
dashboard link: https://syzkaller.appspot.com/bug?extid=00e15cda746c5bc70e24
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15d5cd96300000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1798471e300000

Reported-by: syzbot+00e15cda746c5bc70e24@...kaller.appspotmail.com
Fixes: 6c2450ae5565 ("io_uring: allocate memory for overflowed CQEs")

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