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    SubjectRe: [syzbot] general protection fault in set_task_ioprio
    On Tue, Dec 21, 2021 at 1:52 AM syzbot
    <syzbot+8836466a79f4175961b0@syzkaller.appspotmail.com> wrote:
    >
    > syzbot has bisected this issue to:
    >
    > commit e4b8954074f6d0db01c8c97d338a67f9389c042f
    > Author: Eric Dumazet <edumazet@google.com>
    > Date: Tue Dec 7 01:30:37 2021 +0000
    >
    > netlink: add net device refcount tracker to struct ethnl_req_info
    >

    Unfortunately this commit will be in the way of many bisections.

    Real bug was added in

    commit 5fc11eebb4a98df5324a4de369bb5ab7f0007ff7
    Author: Christoph Hellwig <hch@lst.de>
    Date: Thu Dec 9 07:31:29 2021 +0100

    block: open code create_task_io_context in set_task_ioprio

    The flow in set_task_ioprio can be simplified by simply open coding
    create_task_io_context, which removes a refcount roundtrip on the I/O
    context.

    Signed-off-by: Christoph Hellwig <hch@lst.de>
    Reviewed-by: Jan Kara <jack@suse.cz>
    Link: https://lore.kernel.org/r/20211209063131.18537-10-hch@lst.de
    Signed-off-by: Jens Axboe <axboe@kernel.dk>


    > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10620fcdb00000
    > start commit: 07f8c60fe60f Add linux-next specific files for 20211220
    > git tree: linux-next
    > final oops: https://syzkaller.appspot.com/x/report.txt?x=12620fcdb00000
    > console output: https://syzkaller.appspot.com/x/log.txt?x=14620fcdb00000
    > kernel config: https://syzkaller.appspot.com/x/.config?x=2060504830b9124a
    > dashboard link: https://syzkaller.appspot.com/bug?extid=8836466a79f4175961b0
    > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12058fcbb00000
    > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17141adbb00000
    >
    > Reported-by: syzbot+8836466a79f4175961b0@syzkaller.appspotmail.com
    > Fixes: e4b8954074f6 ("netlink: add net device refcount tracker to struct ethnl_req_info")
    >
    > For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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