Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753963AbZGAESo (ORCPT ); Wed, 1 Jul 2009 00:18:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750806AbZGAESg (ORCPT ); Wed, 1 Jul 2009 00:18:36 -0400 Received: from mail-qy0-f193.google.com ([209.85.221.193]:54023 "EHLO mail-qy0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750782AbZGAESf (ORCPT ); Wed, 1 Jul 2009 00:18:35 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=t1tj7jhb0eEJY2fXct0XgVPSKW+o9N+MXu3zlBdXyrq1ZALGFIZfaebjq7U0wzlmRy PlBHc6nP3tXCrxp/APc7HvtDaAdoRTpPEgP4FWD+LsDpzncdNg5J+fVlXnpTbqVOlJZG EUDiauIg3Helg79OoUjYlxnmdu+DL67XzSkkk= MIME-Version: 1.0 Date: Tue, 30 Jun 2009 21:18:35 -0700 Message-ID: <86802c440906302118oa181b2fm9599137bb2314129@mail.gmail.com> Subject: pci_stub and kvm From: Yinghai Lu To: Ingo Molnar , Avi Kivity , jbarnes@virtuousgeek.org Cc: Linux Kernel Mailing List , linux-pci@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4984 Lines: 95 [ 1966.343286] [ 1966.343288] ======================================================= [ 1966.356756] [ INFO: possible circular locking dependency detected ] [ 1966.356759] 2.6.31-rc1-tip-00978-g99123e5-dirty #438 [ 1966.356761] ------------------------------------------------------- [ 1966.356764] events/0/387 is trying to acquire lock: [ 1966.356766] (&kvm->lock){+.+.+.}, at: [] kvm_assigned_dev_interrupt_work_handler+0x42/0x13a [ 1966.356786] [ 1966.356787] but task is already holding lock: [ 1966.356789] (&match->interrupt_work){+.+...}, at: [] worker_thread+0x175/0x2f6 [ 1966.356797] [ 1966.356798] which lock already depends on the new lock. [ 1966.356799] [ 1966.356800] [ 1966.356801] the existing dependency chain (in reverse order) is: [ 1966.356803] [ 1966.356803] -> #1 (&match->interrupt_work){+.+...}: [ 1966.356809] [] __lock_acquire+0x1396/0x1710 [ 1966.356817] [] lock_acquire+0xcc/0x104 [ 1966.356821] [] __cancel_work_timer+0x121/0x247 [ 1966.356825] [] cancel_work_sync+0x23/0x39 [ 1966.356828] [] kvm_deassign_irq+0xf1/0x183 [ 1966.356832] [] kvm_vm_ioctl+0x8c8/0xc1a [ 1966.356837] [] vfs_ioctl+0x3e/0xa3 [ 1966.356846] [] do_vfs_ioctl+0x4be/0x511 [ 1966.356850] [] sys_ioctl+0x56/0x8d [ 1966.356854] [] system_call_fastpath+0x16/0x1b [ 1966.356860] [] 0xffffffffffffffff [ 1966.356869] [ 1966.356870] -> #0 (&kvm->lock){+.+.+.}: [ 1966.356872] [] __lock_acquire+0x10cb/0x1710 [ 1966.356875] [] lock_acquire+0xcc/0x104 [ 1966.356878] [] mutex_lock_nested+0x75/0x2fa [ 1966.356886] [] kvm_assigned_dev_interrupt_work_handler+0x42/0x13a [ 1966.356890] [] worker_thread+0x1cf/0x2f6 [ 1966.356892] [] kthread+0xa8/0xb0 [ 1966.356899] [] child_rip+0xa/0x20 [ 1966.356906] [] 0xffffffffffffffff [ 1966.356908] [ 1966.356909] other info that might help us debug this: [ 1966.356909] [ 1966.356911] 2 locks held by events/0/387: [ 1966.356913] #0: (events){+.+.+.}, at: [] worker_thread+0x175/0x2f6 [ 1966.356917] #1: (&match->interrupt_work){+.+...}, at: [] worker_thread+0x175/0x2f6 [ 1966.356922] [ 1966.356923] stack backtrace: [ 1966.356925] Pid: 387, comm: events/0 Not tainted 2.6.31-rc1-tip-00978-g99123e5-dirty #438 [ 1966.356928] Call Trace: [ 1966.356932] [] print_circular_bug_tail+0xd0/0xef [ 1966.356935] [] ? check_noncircular+0xec/0x14c [ 1966.356939] [] __lock_acquire+0x10cb/0x1710 [ 1966.356942] [] ? kvm_assigned_dev_interrupt_work_handler+0x42/0x13a [ 1966.356947] [] ? save_trace+0x4e/0xc2 [ 1966.356950] [] ? check_irq_usage+0xc6/0xf0 [ 1966.356953] [] ? kvm_assigned_dev_interrupt_work_handler+0x42/0x13a [ 1966.356956] [] lock_acquire+0xcc/0x104 [ 1966.356959] [] ? kvm_assigned_dev_interrupt_work_handler+0x42/0x13a [ 1966.356962] [] ? worker_thread+0x175/0x2f6 [ 1966.356965] [] mutex_lock_nested+0x75/0x2fa [ 1966.356968] [] ? kvm_assigned_dev_interrupt_work_handler+0x42/0x13a [ 1966.356972] [] ? kvm_assigned_dev_interrupt_work_handler+0x42/0x13a [ 1966.356975] [] ? worker_thread+0x175/0x2f6 [ 1966.356977] [] ? worker_thread+0x175/0x2f6 [ 1966.356980] [] ? worker_thread+0x175/0x2f6 [ 1966.356983] [] kvm_assigned_dev_interrupt_work_handler+0x42/0x13a [ 1966.356986] [] worker_thread+0x1cf/0x2f6 [ 1966.356989] [] ? worker_thread+0x175/0x2f6 [ 1966.356992] [] ? kvm_assigned_dev_interrupt_work_handler+0x0/0x13a [ 1966.356996] [] ? autoremove_wake_function+0x0/0x63 [ 1966.356998] [] ? worker_thread+0x0/0x2f6 [ 1966.357001] [] kthread+0xa8/0xb0 [ 1966.357005] [] child_rip+0xa/0x20 [ 1966.357008] [] ? restore_args+0x0/0x30 [ 1966.357011] [] ? kthread+0x0/0xb0 [ 1966.357014] [] ? child_rip+0x0/0x20 [ 1966.600740] pci-stub 0000:83:00.0: irq 150 for MSI/MSI-X [ 1966.601061] pci-stub 0000:83:00.0: irq 150 for MSI/MSI-X -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/