linux-kernel - Re: [syzbot] KASAN: use-after-free Read in io_poll_remove

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Date:   Tue, 22 Mar 2022 20:25:12 -0700
From:   syzbot <syzbot+cd301bb6523ea8cc8ca2@...kaller.appspotmail.com>
To:     asml.silence@...il.com, axboe@...nel.dk,
        gregkh@...uxfoundation.org, io-uring@...r.kernel.org,
        jirislaby@...nel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in io_poll_remove_entries

syzbot has bisected this issue to:

commit 91eac1c69c202d9dad8bf717ae5b92db70bfe5cf
Author: Jens Axboe <axboe@...nel.dk>
Date:   Wed Mar 16 22:59:10 2022 +0000

    io_uring: cache poll/double-poll state with a request flag

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11819d0b700000
start commit:   b47d5a4f6b8d Merge tag 'audit-pr-20220321' of git://git.ke..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=13819d0b700000
console output: https://syzkaller.appspot.com/x/log.txt?x=15819d0b700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c44f0c051803a0ae
dashboard link: https://syzkaller.appspot.com/bug?extid=cd301bb6523ea8cc8ca2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=150525ed700000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10d08625700000

Reported-by: syzbot+cd301bb6523ea8cc8ca2@...kaller.appspotmail.com
Fixes: 91eac1c69c20 ("io_uring: cache poll/double-poll state with a request flag")

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