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Date: Mon, 30 Oct 2017 11:02:58 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Fengguang Wu <fengguang.wu@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Ingo Molnar <mingo@kernel.org>, Stephane Eranian <eranian@google.com>,
        Kan Liang <kan.liang@intel.com>
Subject: Re: Linux 4.14-rc6: WARNING: CPU: 9 PID: 5377 at
 arch/x86/events/intel/core.c:2228 intel_pmu_handle_irq+0x4a8/0x4c0
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On Mon, Oct 30, 2017 at 07:27:36AM +0100, Fengguang Wu wrote:

> [  189.480568] perf: interrupt took too long (5132 > 4982), lowering kernel.perf_event_max_sample_rate to 38000
> [  189.690660] perf: interrupt took too long (6582 > 6415), lowering kernel.perf_event_max_sample_rate to 30000
> [  189.901706] perf: interrupt took too long (8268 > 8227), lowering kernel.perf_event_max_sample_rate to 24000
> [  272.841032] perfevents: irq loop stuck!
> [  272.841038] ------------[ cut here ]------------
> [  272.841046] WARNING: CPU: 9 PID: 5377 at arch/x86/events/intel/core.c:2228 intel_pmu_handle_irq+0x4a8/0x4c0

So I've not seen this in a fair while; is this new in 4.14?

> [  272.841083] CPU: 9 PID: 5377 Comm: usemem Not tainted 4.14.0-rc6 #1

At least you've got the right kernel this time... :-)

> [  272.841084] Hardware name: Intel Corporation S2600WTT/S2600WTT, BIOS GRRFSDP1.86B.0271.R00.1510301446 10/30/2015

That's a dual socket board for Xeon E5v3, which translates to HSW-EP if
google is any good today. That's not a machine I have. Can you see this
on other hardware too, like say IVB-EP ?