linux-kernel - Re: Linux 4.14-rc6: WARNING: CPU: 9 PID: 5377 at arch/x86/events/intel/core.c:2228 intel_pmu_handle

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Date:   Mon, 30 Oct 2017 11:02:58 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Kan Liang <kan.liang@...el.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

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 ?