Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751799AbaBRSfw (ORCPT ); Tue, 18 Feb 2014 13:35:52 -0500 Received: from mail-qa0-f47.google.com ([209.85.216.47]:64125 "EHLO mail-qa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750901AbaBRSfu (ORCPT ); Tue, 18 Feb 2014 13:35:50 -0500 Date: Tue, 18 Feb 2014 13:30:21 -0500 (EST) From: Vince Weaver To: Peter Zijlstra cc: Vince Weaver , Dave Jones , Linux Kernel , Ingo Molnar , Paul Mackerras Subject: Re: x86_pmu_start WARN_ON. In-Reply-To: <20140217152859.GF15586@twins.programming.kicks-ass.net> Message-ID: References: <20140130190253.GA11819@redhat.com> <20140211132956.GY9987@twins.programming.kicks-ass.net>

<20140217152859.GF15586@twins.programming.kicks-ass.net> User-Agent: Alpine 2.10 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 17 Feb 2014, Peter Zijlstra wrote: > Enable CONFIG_FRAME_POINTER for better stack traces; I suspect the > list_del_event() is just random stack garbage. The path that makes sense > is: > wait_rcu()->__wait_for_common()->schedule_timeout() Here's an updated stack trace on 3.14-rc3 with CONFIG_FRAME_POINTER enabled, in case it's helpful: [ 237.004035] ------------[ cut here ]------------ [ 237.008016] WARNING: CPU: 1 PID: 2791 at arch/x86/kernel/cpu/perf_event.c:1076 x86_pmu_start+0x41/0x113() [ 237.008016] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg mcs7830 usbnet evdev wmi acpi_cpufreq video coretemp psmouse processor thermal_sys button ohci_pci ohci_hcd serio_raw pcspkr i2c_nforce2 sg ehci_pci ehci_hcd sd_mod usbcore usb_common [ 237.008016] CPU: 1 PID: 2791 Comm: pec_1076_warn Not tainted 3.14.0-rc3+ #10 [ 237.008016] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015 10/19/2012 [ 237.008016] 0000000000000434 ffff8800cae6b9d8 ffffffff8150e4ff 0000000000000434 [ 237.008016] 0000000000000000 ffff8800cae6ba18 ffffffff8103d64e ffff8800cae6ba48 [ 237.008016] ffffffff81012b10 0000000000000021 ffff88011b31dc00 ffff88011fc8b940 [ 237.008016] Call Trace: [ 237.008016] [] dump_stack+0x49/0x62 [ 237.008016] [] warn_slowpath_common+0x7c/0x96 [ 237.008016] [] ? x86_pmu_start+0x41/0x113 [ 237.008016] [] warn_slowpath_null+0x15/0x17 [ 237.008016] [] x86_pmu_start+0x41/0x113 [ 237.008016] [] x86_pmu_enable+0x1d8/0x27d [ 237.008016] [] perf_pmu_enable+0x21/0x23 [ 237.008016] [] perf_event_context_sched_in+0x79/0x9a [ 237.008016] [] __perf_event_task_sched_in+0x26/0x10f [ 237.008016] [] ? idle_balance+0x125/0x161 [ 237.008016] [] finish_task_switch+0x41/0xa8 [ 237.008016] [] __schedule+0x48f/0x4e3 [ 237.008016] [] ? __hrtimer_start_range_ns+0x2e8/0x2fa [ 237.008016] [] schedule+0x6e/0x70 [ 237.008016] [] schedule_timeout+0x22/0xbd [ 237.008016] [] ? dump_stack+0x62/0x62 [ 237.008016] [] __wait_for_common+0xc6/0x142 [ 237.008016] [] ? try_to_wake_up+0x1a8/0x1a8 [ 237.008016] [] ? T.944+0x1de/0x1de [ 237.008016] [] wait_for_completion+0x1f/0x21 [ 237.008016] [] wait_rcu_gp+0x46/0x4f [ 237.008016] [] ? wait_rcu_gp+0x4f/0x4f [ 237.008016] [] synchronize_sched+0x29/0x2b [ 237.008016] [] perf_trace_event_unreg+0x36/0xc8 [ 237.008016] [] perf_trace_destroy+0x36/0x46 [ 237.008016] [] tp_perf_event_destroy+0x9/0xb [ 237.008016] [] __free_event+0x35/0x5d [ 237.008016] [] free_event+0x10d/0x116 [ 237.008016] [] perf_event_release_kernel+0x7d/0x88 [ 237.008016] [] put_event+0xa3/0xac [ 237.008016] [] perf_release+0x10/0x14 [ 237.008016] [] __fput+0xeb/0x1b0 [ 237.008016] [] ____fput+0x9/0xb [ 237.008016] [] task_work_run+0x83/0x9b [ 237.008016] [] do_notify_resume+0x58/0x5f [ 237.008016] [] int_signal+0x12/0x17 [ 237.008016] ---[ end trace a07d99177587379f ]--- [ 237.008016] IN: VMW: idx=33 state=0 type=0 config=0 samp_per=5e619d890 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/