From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752915AbXCaLUU (ORCPT ); Sat, 31 Mar 2007 07:20:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752921AbXCaLUT (ORCPT ); Sat, 31 Mar 2007 07:20:19 -0400 Received: from ug-out-1314.google.com ([66.249.92.168]:24744 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752915AbXCaLUR (ORCPT ); Sat, 31 Mar 2007 07:20:17 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:user-agent:mime-version:to:cc:subject:references:in-reply-to:x-enigmail-version:content-type:content-transfer-encoding:from; b=o6+ZdQf/mpoDAqcCM3aVtrmJpdU9bG4/dOIeOvB166QDX+2fq9VT3jTWE0GhIOjpAvwFljklUB6KSQiWAAeYA/Ym9BJBVXun3Tt+QL5JAONvydAS2WY/0EeI+MVLwEY54s7zuDOlGJdbohiw28m0/b5uYEtj355tL9XLSyEXtJU= Message-ID: <460E43D2.70504@googlemail.com> Date: Sat, 31 Mar 2007 13:19:46 +0200 User-Agent: Thunderbird 1.5.0.10 (X11/20070302) MIME-Version: 1.0 To: Andi Kleen CC: Andrew Morton , Jan Beulich , Ingo Molnar , Michal Piotrowski , Thomas Gleixner , linux-kernel@vger.kernel.org Subject: Re: Fw: Re: 2.6.21-rc5-mm3 References: <20070330103958.16b738aa.akpm@linux-foundation.org> <200703302131.23469.ak@suse.de> In-Reply-To: <200703302131.23469.ak@suse.de> X-Enigmail-Version: 0.94.1.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Michal Piotrowski Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andi Kleen napisał(a): >> BUG: NMI Watchdog detected LOCKUP on CPU0, eip c014ce9c, registers: > > I suspect it is just because his console is too slow and then unwinding > took too long and it happened to hit the unwinder. > > You did use a slow console, right? console=ttyS0,115200n8 > > I suppose it just needs a strategic touch_nmi_watchdog. Will add that. > >> Modules linked in: ide_cd cdrom rtc unix >> CPU: 0 >> EIP: 0060:[] Not tainted VLI >> EFLAGS: 00000093 (2.6.21-rc5-mm3 #10) >> EIP is at read_pointer+0x49/0x2d8 >> eax: c7a8dd04 ebx: 00000000 ecx: 00000000 edx: c043d19c >> esi: c043d184 edi: c043d19c ebp: c7a8dbf4 esp: c7a8dbbc >> ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068 >> Process udevd (pid: 864, ti=c7a8c000 task=c97cd4d0 task.ti=c7a8c000) >> Stack: 0000000b c7a8dc70 c7a8dbf4 c014d6d0 c7a8dd04 c043e454 c7a8dbf4 c011fdd1 >> c043e404 c043e454 c043d190 0005cd94 c043d184 c7a8dd04 c7a8dd14 c014dd3a >> 00000000 00000000 00000000 00000000 c7a8df44 c7a8dd74 c741eefb 00000008 >> Call Trace: >> [] unwind+0x414/0xfa2 >> [] dump_trace_unwind+0xb4/0xe5 >> [] unwind_init_running+0x25/0x2b >> [] dump_trace+0x63/0x1eb >> [] save_stack_trace+0x23/0x42 >> [] update_cpu_base_expires_next+0x56/0x5a >> [] hrtimer_interrupt+0x17c/0x1b8 >> [] smp_apic_timer_interrupt+0x72/0x85 >> [] apic_timer_interrupt+0x33/0x38 >> [] lock_release+0x1d2/0x1da >> [] up_read+0x19/0x2e >> [] do_page_fault+0x28f/0x55b >> [] error_code+0x79/0x80 >> [] __put_user_4+0x12/0x18 >> DWARF2 unwinder stuck at __put_user_4+0x12/0x18 >> Leftover inexact backtrace: >> [] ret_from_fork+0x6/0x1c > > Hmpf. I saw it once in child_rip here too. Then I wanted to reproduce it to report > properly and couldn't again. I had a few other backtraces that were all non stuck > with child_rip then on essentially the same kernel. Something weird is going on. > >> [] hrtimer_interrupt+0x17c/0x1b8 >> [] smp_apic_timer_interrupt+0x72/0x85 >> [] apic_timer_interrupt+0x33/0x38 >> [] __get_user_4+0x14/0x17 >> DWARF2 unwinder stuck at __get_user_4+0x14/0x17 >> Leftover inexact backtrace: > > Now that is weird. Never seen before. Jan, any ideas? > > What is your gcc/compiler, Michal? gcc --version gcc (GCC) 4.1.1 20070105 (Red Hat 4.1.1-51) > > -Andi > > > Were there any strange binutils in use, Michal? I don't remember when I had problems with this compiler. > >> [] do_execve+0xdd/0x210 >> [] sys_execve+0x3f/0x62 >> [] sysenter_past_esp+0x5f/0x99 > Regards, Michal -- Michal K. K. Piotrowski LTG - Linux Testers Group (PL) (http://www.stardust.webpages.pl/ltg/) LTG - Linux Testers Group (EN) (http://www.stardust.webpages.pl/linux_testers_group_en/)