linux-kernel - Re: INFO: rcu detected stall in sys

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Message-ID: <20200107131146.GX2827@hirez.programming.kicks-ass.net>
Date:   Tue, 7 Jan 2020 14:11:46 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        syzbot <syzbot+bcad772bbc241b4c6147@...kaller.appspotmail.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Ingo Molnar <mingo@...hat.com>,
        James Morris <jmorris@...ei.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: INFO: rcu detected stall in sys_sendfile64

On Tue, Jan 07, 2020 at 02:02:47PM +0100, Dmitry Vyukov wrote:
> > >> This is not a LSM problem, for the reproducer is calling
> > >> sched_setattr(SCHED_DEADLINE) with very large values.
> > >>
> > >>   sched_setattr(0, {size=0, sched_policy=0x6 /* SCHED_??? */, sched_flags=0, sched_nice=0, sched_priority=0, sched_runtime=2251799813724439, sched_deadline=4611686018427453437, sched_period=0}, 0) = 0
> > >>
> > >> I think that this problem is nothing but an insane sched_setattr() parameter.

Argh, I had a patch for that somewhere. Let me go dig that out.