From mboxrd@z Thu Jan 1 00:00:00 1970 From: Darren Hart Subject: Re: 3.8.4-rt2 panic in migrate_task_rq_fair Date: Fri, 05 Apr 2013 10:17:36 -0700 Message-ID: <515F0730.9000006@linux.intel.com> References: <515F000D.9090500@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit To: linux-rt-users Return-path: Received: from mga02.intel.com ([134.134.136.20]:33711 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1162035Ab3DERRh (ORCPT ); Fri, 5 Apr 2013 13:17:37 -0400 In-Reply-To: <515F000D.9090500@linux.intel.com> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On 04/05/2013 09:47 AM, Darren Hart wrote: > Running on a UEFI 32bit Atom E6xx system I see the following panic after > several minutes running the following cyclictest command. > > root@sys940x:~# cyclictest -p 50 -d 10m -t -q Whoops, I should have used "-D 10m", but the following is of course still a problem. -- Darren > # /dev/cpu_dma_latency set to 0us > > BUG: unable to handle kernel paging request at fffffff4 > IP: [] migrate_task_rq_fair+0x4c/0x100 > *pde = 0198f067 *pte = 00000000 > Oops: 0000 [#1] PREEMPT SMP > Modules linked in: > Pid: 649, comm: cyclictest Not tainted 3.8.4-rt2-yocto-preempt-rt #1 > EIP: 0060:[] EFLAGS: 00010046 CPU: 0 > EIP is at migrate_task_rq_fair+0x4c/0x100 > EAX: 00000000 EBX: deec43f0 ECX: 00000000 EDX: 00000000 > ESI: dde8f948 EDI: c1983900 EBP: dee9fe58 ESP: dee9fe40 > DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 > CR0: 80050033 CR2: fffffff4 CR3: 1ef64000 CR4: 000007d0 > DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 > DR6: ffff0ff0 DR7: 00000400 > Process cyclictest (pid: 649, ti=dee9e000 task=def74170 task.ti=dee9e000) > Stack: > c197f060 00000000 00000000 00000000 deec43f0 00000001 dee9fec0 c1064ec5 > c10380ce 00000010 dee9fe7c c1065894 de699ef0 619b7c30 00000000 dee9feac > 00000010 00000000 dee9fea0 c1037f76 00000000 def74170 00000001 dee9ff28 > Call Trace: > [] set_task_cpu+0x55/0x1b0 > [] ? unpin_current_cpu+0xe/0x70 > [] ? migrate_enable+0xc4/0x1c0 > [] ? pin_current_cpu+0x76/0x1c0 > [] try_to_wake_up+0x18c/0x300 > [] wake_up_process+0x1f/0x40 > [] hrtimer_wakeup+0x1d/0x30 > [] __run_hrtimer+0x9b/0x260 > [] ? update_rmtp+0x90/0x90 > [] hrtimer_interrupt+0x272/0x320 > [] smp_apic_timer_interrupt+0x55/0x87 > [] apic_timer_interrupt+0x2d/0x34 > [] ? resume_kernel+0x44/0x44 > Code: 83 74 01 00 00 74 48 8d 4e 58 e8 94 2e 2c 00 89 45 f0 89 55 f4 8b > 8b 78 01 00 00 8b 93 74 01 00 00 29 55 f0 19 4d f4 31 c0 31 d2 <8b> 49 > f4 0b 4d f0 75 2c 89 83 74 01 00 00 89 93 78 01 00 00 8b > > EIP: [] migrate_task_rq_fair+0x4c/0x100 SS:ESP 0068:dee9fe40 > CR2: 00000000fffffff4 > ---[ end trace 0000000000000002 ]--- > Kernel panic - not syncing: Fatal exception in interrupt > -- Darren Hart Intel Open Source Technology Center Yocto Project - Technical Lead - Linux Kernel