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

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Date:   Mon, 13 Mar 2023 07:32:24 -0700
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] [io-uring?] KASAN: use-after-free Read in io_wq_worker_wake

syzbot suspects this issue was fixed by commit:

commit e6db6f9398dadcbc06318a133d4c44a2d3844e61
Author: Jens Axboe <axboe@...nel.dk>
Date:   Sun Jan 8 17:39:17 2023 +0000

    io_uring/io-wq: only free worker if it was allocated for creation

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=113a76fac80000
start commit:   1fe4fd6f5cad Merge tag 'xfs-6.2-fixes-2' of git://git.kern..
git tree:       upstream
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

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: io_uring/io-wq: only free worker if it was allocated for creation

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