INFO: rcu detected stall in sys_sendfile64

[Peter Zijlstra]

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.