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    SubjectRe: INFO: rcu detected stall in sys_sendfile64 (2)
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    On 2019/01/19 20:41, Dmitry Vyukov wrote:
    > On Sat, Jan 19, 2019 at 12:32 PM syzbot
    > <syzbot+1505c80c74256c6118a5@syzkaller.appspotmail.com> wrote:
    >>
    >> Hello,
    >>
    >> syzbot found the following crash on:
    >>
    >> HEAD commit: 2339e91d0e66 Merge tag 'media/v5.0-1' of git://git.kernel...
    >> git tree: upstream
    >> console output: https://syzkaller.appspot.com/x/log.txt?x=175f2638c00000
    >> kernel config: https://syzkaller.appspot.com/x/.config?x=abc3dc9b7a900258
    >> dashboard link: https://syzkaller.appspot.com/bug?extid=1505c80c74256c6118a5
    >> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
    >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c4dc28c00000
    >> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15df4108c00000
    >
    > Looking at the reproducer it looks like something with scheduler as it
    > involves perf_event_open and sched_setattr. So +Peter and Mingo.
    > Is it the same root cause as the other stalls involving sched_setattr?

    Yes. I think sched_setattr() involves this problem.

    Reproducers from "BUG: workqueue lockup (4)" at
    https://syzkaller.appspot.com/text?tag=ReproC&x=13ec31a5400000
    involves sched_setattr(SCHED_DEADLINE) and
    https://syzkaller.appspot.com/text?tag=ReproC&x=104da690c00000
    also involves sched_setattr().

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