From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755095Ab2HVCuh (ORCPT ); Tue, 21 Aug 2012 22:50:37 -0400 Received: from mga01.intel.com ([192.55.52.88]:4258 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752271Ab2HVCuc (ORCPT ); Tue, 21 Aug 2012 22:50:32 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.77,806,1336374000"; d="scan'208";a="208064512" Date: Wed, 22 Aug 2012 10:50:08 +0800 From: Fengguang Wu To: "Tang, Feng" Cc: "Paul E. McKenney" , Steven Rostedt , Avi Kivity , Steven Rostedt , LKML , "kvm@vger.kernel.org" , Kenji Kaneshige , Yinghai Lu , Bjorn Helgaas , linux-pci@vger.kernel.org Subject: Re: pci_get_subsys: GFP_KERNEL allocations with IRQs disabled Message-ID: <20120822025008.GA8066@localhost> References: <5017D19B.5080806@redhat.com> <1343738627.27983.30.camel@gandalf.stny.rr.com> <5017D4AB.3090107@redhat.com> <1343740419.27983.33.camel@gandalf.stny.rr.com> <20120731234336.GA5526@localhost> <1343778699.27983.70.camel@gandalf.stny.rr.com> <20120731235705.GW2422@linux.vnet.ibm.com> <1343779778.27983.73.camel@gandalf.stny.rr.com> <20120801001811.GX2422@linux.vnet.ibm.com> <20120801004319.GA7043@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120801004319.GA7043@localhost> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Feng, > I think it's pci_get_subsys() triggered this assert: > > /* > * Oi! Can't be having __GFP_FS allocations with IRQs disabled. > */ > if (DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags))) > return; It's bisected down to this commit: commit 55c844a4dd16a4d1fdc0cf2a283ec631a02ec448 Author: Feng Tang AuthorDate: Wed May 30 23:15:41 2012 +0800 Commit: Ingo Molnar CommitDate: Wed Jun 6 12:03:23 2012 +0200 x86/reboot: Fix a warning message triggered by stop_other_cpus() Thanks, Fengguang > [ 91.282131] machine restart > [ 91.283895] ------------[ cut here ]------------ > [ 91.284731] WARNING: at /c/wfg/linux/kernel/lockdep.c:2739 lockdep_trace_alloc+0x1fb/0x210() > [ 91.286132] Modules linked in: > [ 91.286703] Pid: 697, comm: reboot Not tainted 3.5.0-00024-g01ff5db-dirty #4 > [ 91.287859] Call Trace: > [ 91.288289] [<81050148>] warn_slowpath_common+0xb8/0x100 > [ 91.289338] [<8110acdb>] ? lockdep_trace_alloc+0x1fb/0x210 > [ 91.290264] [<8110acdb>] ? lockdep_trace_alloc+0x1fb/0x210 > [ 91.291161] [<810501ce>] warn_slowpath_null+0x3e/0x50 > [ 91.292042] [<8110acdb>] lockdep_trace_alloc+0x1fb/0x210 > [ 91.292934] [<81228e25>] kmem_cache_alloc_trace+0x55/0x600 > [ 91.292934] [<813025ca>] ? kobject_put+0x9a/0x160 > [ 91.292934] [<814e95e0>] ? klist_iter_exit+0x30/0x50 > [ 91.292934] [<81405881>] ? bus_find_device+0xf1/0x120 > [ 91.292934] [<81361a3c>] ? pci_get_subsys+0x11c/0x1b0 > [ 91.292934] [<81361a3c>] pci_get_subsys+0x11c/0x1b0 > [ 91.292934] [<81361afe>] pci_get_device+0x2e/0x40 > [ 91.292934] [<81033e25>] mach_reboot_fixups+0xa5/0xd0 > [ 91.292934] [<81027611>] native_machine_emergency_restart+0x1f1/0x590 > [ 91.292934] [<814f2e00>] ? printk+0x4b/0x5b > [ 91.292934] [<810269ef>] native_machine_restart+0x6f/0x80 > [ 91.292934] [<810271cc>] machine_restart+0x1c/0x30 > [ 91.292934] [<810886e0>] kernel_restart+0x70/0xc0 > [ 91.292934] [<81088a85>] sys_reboot+0x325/0x380 > [ 91.292934] [<811f796c>] ? handle_pte_fault+0xdc/0x1740 > [ 91.292934] [<811f93e7>] ? handle_mm_fault+0x417/0x4a0 > [ 91.292934] [<8103e07b>] ? do_page_fault+0x7fb/0xb30 > [ 91.292934] [<810b33e7>] ? up_read+0x37/0x70 > [ 91.292934] [<8103e07b>] ? do_page_fault+0x7fb/0xb30 > [ 91.292934] [<8123c063>] ? do_sys_open+0x3a3/0x3f0 > [ 91.292934] [<8123c063>] ? do_sys_open+0x3a3/0x3f0 > [ 91.292934] [<810b0270>] ? update_rmtp+0xe0/0xe0 > [ 91.292934] [<8150376e>] ? restore_all+0xf/0xf > [ 91.292934] [<8103d880>] ? vmalloc_sync_all+0x320/0x320 > [ 91.292934] [<81109fca>] ? trace_hardirqs_on_caller+0x28a/0x380 > [ 91.292934] [<81311594>] ? trace_hardirqs_on_thunk+0xc/0x10 > [ 91.292934] [<81503735>] syscall_call+0x7/0xb > > Thanks, > Fengguang