From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757157Ab0JUL0i (ORCPT ); Thu, 21 Oct 2010 07:26:38 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:50614 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754615Ab0JUL0h (ORCPT ); Thu, 21 Oct 2010 07:26:37 -0400 Date: Thu, 21 Oct 2010 13:26:14 +0200 From: Ingo Molnar To: Steven Rostedt Cc: Jason Baron , LKML , Andrew Morton , Frederic Weisbecker , Thomas Gleixner , "H. Peter Anvin" , Peter Zijlstra , Arnaldo Carvalho de Melo Subject: Re: [PATCH][GIT PULL] tracing: Fix compile issue for trace_sched_wakeup.c Message-ID: <20101021112614.GB26984@elte.hu> References: <1287508282.16971.386.camel@gandalf.stny.rr.com> <20101019184111.GA17266@elte.hu> <20101020154045.GA18353@elte.hu> <1287659656.16971.573.camel@gandalf.stny.rr.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1287659656.16971.573.camel@gandalf.stny.rr.com> User-Agent: Mutt/1.5.20 (2009-08-17) X-ELTE-SpamScore: 0.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=0.0 required=5.9 tests=none autolearn=no SpamAssassin version=3.2.5 _SUMMARY_ Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Steven Rostedt wrote: > On Wed, 2010-10-20 at 17:40 +0200, Ingo Molnar wrote: > > FYI, there's a new mystery hang (sometimes crash) that triggers in -tip - and which > > seems to be tracing related. See the crashlog below - config attached. > > > > It's not bisectable - small changes in the kernel make the bug come/go. (might be a > > race of some sorts) > > > > > > [ 42.324027] Testing all events: > > [ 245.668090] INFO: task swapper:1 blocked for more than 120 seconds. > > [ 245.672051] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > > [ 245.676026] swapper D f6420b40 6544 1 0 0x00000000 > > [ 245.684051] f6437dac 00000046 f694aac0 f6420b40 f6438000 f6437d74 f6438294 f6438290 > > [ 245.692237] c2192ac0 c204e6c0 c2192ac0 c2192ac0 f6438290 00000000 f6438000 ff2ffa7d > > [ 245.701068] 00000009 f6420b40 f6437e5c 7fffffff f6438000 f6437dfc f6437e5c 7fffffff > > [ 245.709071] Call Trace: > > [ 245.711551] [] schedule_timeout+0x1c/0x1e7 > > [ 245.712036] [] ? _raw_spin_unlock_irq+0x2d/0x43 > > [ 245.716037] [] ? sub_preempt_count+0x4/0x98 > > [ 245.720061] [] ? _raw_spin_unlock_irq+0x2d/0x43 > > [ 245.724036] [] ? sub_preempt_count+0x8b/0x98 > > [ 245.728036] [] wait_for_common+0xc1/0x11a > > [ 245.732062] [] ? default_wake_function+0x0/0x12 > > [ 245.736041] [] wait_for_completion+0x17/0x19 > > [ 245.740069] [] __stop_cpus+0xdd/0x103 > > [ 245.744072] [] ? wait_for_common+0x31/0x11a > > [ 245.748040] [] ? stop_machine_cpu_stop+0x0/0x9a > > [ 245.752040] [] stop_cpus+0x2c/0x3f > > [ 245.756069] [] __stop_machine+0x5f/0x67 > > [ 245.760186] [] ? stop_machine_text_poke+0x0/0x43 > > [ 245.764040] [] ? stop_machine_text_poke+0x0/0x43 > > [ 245.768071] [] ? cfdgml_create+0x2b/0xde > > [ 245.772040] [] text_poke_smp+0x3a/0x42 > > [ 245.776039] [] ? cfdgml_create+0x2b/0xde > > > > [ 245.780098] [] arch_jump_label_transform+0x53/0x67 > > [ 245.784042] [] jump_label_update+0x49/0x98 > > Looks like this code had jump labels enabled. Do you have a dump where > they are not enabled? No. Good find - and the timeline agrees too, these crashes started triggering when i pulled jump labels from you. Thanks, Ingo