From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Hansen Subject: Re: 2.6.30-rc2 soft lockups: ACPI? clock source problem? Date: Thu, 23 Apr 2009 17:26:58 -0700 Message-ID: <1240532818.8035.8.camel@nimitz> References: <1240335038.11194.11.camel@nimitz> <20090422204557.10c3cc37.akpm@linux-foundation.org> <1240511508.10627.159.camel@nimitz> <1240513827.7224.2.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from www.sr71.net ([198.145.64.142]:43543 "EHLO blackbird.sr71.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751128AbZDXA1A (ORCPT ); Thu, 23 Apr 2009 20:27:00 -0400 In-Reply-To: <1240513827.7224.2.camel@localhost.localdomain> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: john stultz Cc: Andrew Morton , linux-kernel , linux-acpi , lenb@kernel.org As John suggested, booting with clocksource=acpi_pm works around the issue. I couldn't reproduce this at all when I boot with init=/bin/sh. That happens both on 2.6.30-rc2 and -rc3. This actually happens relatively late in boot. I also noticed that it seems to always happen during the ACPI messages in that "power states" area. So, I tried booting to /bin/sh again, waiting a few seconds, and doing 'modprobe processor'. Bingo. I got the trace right when I did the modprobe. It doesn't look like it comes from the prinks themselves though: printk(KERN_INFO PREFIX "CPU%d (power states:", pr->id); for (i = 1; i <= pr->power.count; i++) if (pr->power.states[i].valid) printk(" C%d[C%d]", i, pr->power.states[i].type); printk(")\n"); Any ideas? Apr 23 09:04:47 nimitz kernel: [ 13.208679] sd 6:0:0:0: [sdc] Attached SCSI disk Apr 23 09:04:47 nimitz kernel: [ 13.653314] ACPI: SSDT bf6e1b32 002C4 (v01 PmRef Cpu0Ist 00000100 INTL 20050513) Apr 23 09:04:47 nimitz kernel: [ 13.669448] ACPI: SSDT bf6e1e7b 0085E (v01 PmRef Cpu0Cst 00000100 INTL 20050513) Apr 23 09:04:47 nimitz kernel: [ 299.093892] ACPI: CPU0 (power states:<3>BUG: soft lockup - CPU#1 stuck for 266s! [modprobe:3193] Apr 23 09:04:47 nimitz kernel: [ 299.100292] Modules linked in: button(+) processor(+) ohci1394 ieee1394 uhci_hcd ehci_hcd thermal fan fuse usb_storage usb_libusual usbcore Apr 23 09:04:47 nimitz kernel: [ 299.100302] Apr 23 09:04:47 nimitz kernel: [ 299.100305] Pid: 3193, comm: modprobe Not tainted (2.6.30-rc3-dirty #327) 7659A71 Apr 23 09:04:47 nimitz kernel: [ 299.100308] EIP: 0073:[<08049942>] EFLAGS: 00000246 CPU: 1 Apr 23 09:04:47 nimitz kernel: [ 299.100311] EIP is at 0x8049942 Apr 23 09:04:47 nimitz kernel: [ 299.100313] EAX: 0000006b EBX: 0000002f ECX: 0000006b EDX: 0804e198 Apr 23 09:04:47 nimitz kernel: [ 299.100315] ESI: 0804e268 EDI: 000000a1 EBP: bf8f73b8 ESP: bf8f7390 -- Dave