Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752440AbaBJVYt (ORCPT ); Mon, 10 Feb 2014 16:24:49 -0500 Received: from mail-qa0-f49.google.com ([209.85.216.49]:64341 "EHLO mail-qa0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751323AbaBJVYq (ORCPT ); Mon, 10 Feb 2014 16:24:46 -0500 Date: Mon, 10 Feb 2014 16:26:29 -0500 (EST) From: Vince Weaver To: Dave Jones , Linux Kernel , Peter Zijlstra , Ingo Molnar , Paul Mackerras Subject: Re: x86_pmu_start WARN_ON. In-Reply-To: <20140130190253.GA11819@redhat.com> Message-ID: References: <20140130190253.GA11819@redhat.com> User-Agent: Alpine 2.10 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="8323329-127185070-1392067593=:29602" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --8323329-127185070-1392067593=:29602 Content-Type: TEXT/PLAIN; charset=US-ASCII On Thu, 30 Jan 2014, Dave Jones wrote: > I gave Vince's perf_fuzzer a run, hoping to trigger a different perf bug > that I've been seeing. Instead I hit a different bug. I've been seeing that WARN_ON for months but it was hard to reproduce. After a lot of hassle (and scores or reboots) I managed to narrow this to a small test case. Unfortunately it only reproduces on my core2 machine. My ivb machine won't trigger it because it doesn't support PERF_COUNT_HW_INSTRUCTIONS when precise_ip=1; is set. This is with 3.14-rc2 The test case is attached, the warning message from my machine is below. Vince [ 47.296031] ------------[ cut here ]------------ [ 47.300013] WARNING: CPU: 0 PID: 2821 at arch/x86/kernel/cpu/perf_event.c:1076 x86_pmu_start+0x46/0xee() [ 47.300013] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg mcs7830 usbnet evdev ohci_pci ohci_hcd pcspkr i2c_nforce2 psmouse serio_raw coretemp video wmi button acpi_cpufreq processor thermal_sys ehci_pci ehci_hcd sg sd_mod usbcore usb_common [ 47.300013] CPU: 0 PID: 2821 Comm: out Not tainted 3.14.0-rc2 #2 [ 47.300013] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015 10/19/2012 [ 47.300013] 0000000000000000 ffffffff817f25ad ffffffff814e746b 0000000000000000 [ 47.300013] ffffffff8103bf1c ffff880037e62420 ffffffff81012126 ffff88011fc13400 [ 47.300013] ffff88011b2b1800 ffff88011fc0b940 0000000000000021 0000000000000000 [ 47.300013] Call Trace: [ 47.300013] [] ? dump_stack+0x41/0x56 [ 47.300013] [] ? warn_slowpath_common+0x79/0x92 [ 47.300013] [] ? x86_pmu_start+0x46/0xee [ 47.300013] [] ? x86_pmu_start+0x46/0xee [ 47.300013] [] ? x86_pmu_enable+0x1d3/0x285 [ 47.300013] [] ? perf_event_context_sched_in+0x6d/0x8d [ 47.300013] [] ? __perf_event_task_sched_in+0x21/0x108 [ 47.300013] [] ? idle_balance+0x11a/0x157 [ 47.300013] [] ? finish_task_switch+0x40/0xa5 [ 47.300013] [] ? __schedule+0x46a/0x4bd [ 47.300013] [] ? schedule_timeout+0x1d/0xb4 [ 47.300013] [] ? generic_exec_single+0x3f/0x52 [ 47.300013] [] ? perf_reg_value+0x4c/0x4c [ 47.300013] [] ? smp_call_function_single+0xdc/0xf2 [ 47.300013] [] ? dump_stack+0x56/0x56 [ 47.300013] [] ? __wait_for_common+0xce/0x14a [ 47.300013] [] ? try_to_wake_up+0x19a/0x19a [ 47.300013] [] ? get_tracepoint+0x20/0x53 [ 47.300013] [] ? T.944+0x1c8/0x1c8 [ 47.300013] [] ? wait_rcu_gp+0x3f/0x46 [ 47.300013] [] ? wait_rcu_gp+0x46/0x46 [ 47.300013] [] ? perf_trace_event_unreg+0x2e/0xbd [ 47.300013] [] ? perf_trace_destroy+0x2e/0x3b [ 47.300013] [] ? __free_event+0x2d/0x52 [ 47.300013] [] ? perf_event_release_kernel+0x74/0x7b [ 47.300013] [] ? perf_release+0x10/0x14 [ 47.300013] [] ? __fput+0xdf/0x1a4 [ 47.300013] [] ? task_work_run+0x7f/0x96 [ 47.300013] [] ? int_signal+0x12/0x17 [ 47.300013] ---[ end trace 9ccad2f02057baa8 ]--- --8323329-127185070-1392067593=:29602 Content-Type: TEXT/x-csrc; name=warning29.c Content-Transfer-Encoding: BASE64 Content-ID: Content-Description: Content-Disposition: attachment; filename=warning29.c LyogbG9nX3RvX2NvZGUgb3V0cHV0IGZyb20gLi93YXJuaW5nMjkubG9nICov DQovKiBieSBWaW5jZSBXZWF2ZXIgPHZpbmNlbnQud2VhdmVyIF9hdF8gbWFp bmUuZWR1ICovDQoNCiNkZWZpbmUgX0dOVV9TT1VSQ0UgMQ0KI2luY2x1ZGUg PHN0ZGlvLmg+DQojaW5jbHVkZSA8dW5pc3RkLmg+DQojaW5jbHVkZSA8ZmNu 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