On Thu, 30 Nov 2017 16:11:22 +0100
Daniel Wagner <wagi@xxxxxxxxx> wrote:
> > Fresh after a boot I just got this:
>
> v4.14.1-rt2 doesn't crash. I suspect that Steven's recent
> change 073371b12467 ("sched/rt: Simplify the IPI based RT balancing logic")
> is the root of the problem.
>
> [ 46.748234] [<c010f15c>] (smp_cross_call) from [<c010f990>] (arch_send_call_function_single_ipi+0x38/0x40)
> [ 46.748253] [<c010f990>] (arch_send_call_function_single_ipi) from [<c024c1b8>] (irq_work_queue_on+0xa4/0x114)
> [ 46.748277] [<c024c1b8>] (irq_work_queue_on) from [<c0183550>] (pull_rt_task+0x334/0x354)
> [ 46.748290] [<c0183550>] (pull_rt_task) from [<c01849dc>] (pick_next_task_rt+0x58/0x2bc)
> [ 46.748311] [<c01849dc>] (pick_next_task_rt) from [<c0880ff0>] (__schedule+0x5b0/0x91c)
> [ 46.748322] [<c0880ff0>] (__schedule) from [<c08813b8>] (schedule+0x5c/0xfc)
> [ 46.748334] [<c08813b8>] (schedule) from [<c0884864>] (do_nanosleep+0xf4/0x20c)
> [ 46.748350] [<c0884864>] (do_nanosleep) from [<c01cd350>] (__hrtimer_nanosleep+0x108/0x184)
> [ 46.748361] [<c01cd350>] (__hrtimer_nanosleep) from [<c01cd478>] (hrtimer_nanosleep+0x1c/0x20)
> [ 46.748372] [<c01cd478>] (hrtimer_nanosleep) from [<c01d6c6c>] (common_nsleep+0x2c/0x30)
> [ 46.748383] [<c01d6c6c>] (common_nsleep) from [<c01d87bc>] (SyS_clock_nanosleep+0xc4/0x110)
> [ 46.748400] [<c01d87bc>] (SyS_clock_nanosleep) from [<c01083a0>] (ret_fast_syscall+0x0/0x28)
>
> Obviously, the beaglebone black has just one CPU, maybe this confused
> the rt balancing logic?
>
Is it compiled for non SMP? That push pull logic shouldn't be called.
-- Steve
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