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

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Message-ID: <000000000000f328e405f1d87b38@google.com>
Date:   Mon, 09 Jan 2023 09:56:18 -0800
From:   syzbot <syzbot+b3ba2408ce0c74bb9230@...kaller.appspotmail.com>
To:     asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in io_wq_worker_wake

syzbot has bisected this issue to:

commit af82425c6a2d2f347c79b63ce74fca6dc6be157f
Author: Jens Axboe <axboe@...nel.dk>
Date:   Mon Jan 2 23:49:46 2023 +0000

    io_uring/io-wq: free worker if task_work creation is canceled

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12cda5d2480000
start commit:   1fe4fd6f5cad Merge tag 'xfs-6.2-fixes-2' of git://git.kern..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=11cda5d2480000
console output: https://syzkaller.appspot.com/x/log.txt?x=16cda5d2480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8b79b14037065d92
dashboard link: https://syzkaller.appspot.com/bug?extid=b3ba2408ce0c74bb9230
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1388e5f2480000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=127f1aa4480000

Reported-by: syzbot+b3ba2408ce0c74bb9230@...kaller.appspotmail.com
Fixes: af82425c6a2d ("io_uring/io-wq: free worker if task_work creation is canceled")

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