linux-kernel - Re: perf code using smp_processor_id() in preemptible [00000000] code

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Date:	Fri, 15 Nov 2013 11:02:54 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Cc:	gorcunov@...il.com
Subject: Re: perf code using smp_processor_id() in preemptible [00000000] code

On Thu, Nov 14, 2013 at 10:29:07PM -0500, Dave Jones wrote:
> BUG: using smp_processor_id() in preemptible [00000000] code: trinity-main/890
> caller is p4_pmu_schedule_events+0x25/0x4c0

Whee, wherever did you dig up that dinosaur ;-)

> CPU: 0 PID: 890 Comm: trinity-main Not tainted 3.12.0+ #3 
> Hardware name: Dell Inc.                 Precision WorkStation 470    /0P7996, BIOS A05 05/18/2005
>  ffff88001e675668 ffff880025e79d00 ffffffff8171f332 0000000000000000
>  ffff880025e79d18 ffffffff8133132a 0000000000000002 ffff880025e79dc0
>  ffffffff81018e55 ffff88001e675668 00000000000080d0 ffff88001e675668
> Call Trace:
>  [<ffffffff8171f332>] dump_stack+0x4e/0x7a
>  [<ffffffff8133132a>] debug_smp_processor_id+0xca/0xe0
>  [<ffffffff81018e55>] p4_pmu_schedule_events+0x25/0x4c0
>  [<ffffffff811a5c9f>] ? kmem_cache_alloc_trace+0x12f/0x2d0
>  [<ffffffff810160ff>] ? allocate_fake_cpuc+0x2f/0x90
>  [<ffffffff81016443>] x86_pmu_event_init+0x193/0x440
>  [<ffffffff81146850>] perf_init_event+0x250/0x330
>  [<ffffffff81146600>] ? perf_pmu_unregister+0x160/0x160
>  [<ffffffff81146ca8>] perf_event_alloc+0x378/0x420
>  [<ffffffff81147335>] SYSC_perf_event_open+0x5e5/0xa80
>  [<ffffffff81147b89>] SyS_perf_event_open+0x9/0x10
>  [<ffffffff81731ee4>] tracesys+0xdd/0xe2

Hrmm, I'm not entire sure what we should do here; Cyrill, do you have
clue?
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