From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754809AbYIKLgq (ORCPT ); Thu, 11 Sep 2008 07:36:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752349AbYIKLgi (ORCPT ); Thu, 11 Sep 2008 07:36:38 -0400 Received: from main.gmane.org ([80.91.229.2]:48730 "EHLO ciao.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752321AbYIKLgh (ORCPT ); Thu, 11 Sep 2008 07:36:37 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Marcus Furlong Subject: Re: 2.6.26.4 hard-unsafe lock order detected (drm-related?) Date: Thu, 11 Sep 2008 12:36:32 +0100 Message-ID: References: <1221070510.4415.207.camel@twins.programming.kicks-ass.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7Bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 84-203-83-149.mysmart.ie User-Agent: KNode/0.10.9 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wednesday 10 September 2008 19:15 in <1221070510.4415.207.camel@twins.programming.kicks-ass.net>, Peter Zijlstra wrote: > On Wed, 2008-09-10 at 17:48 +0100, Marcus Furlong wrote: >> Hi, >> >> Just found this in dmesg, if any more info is needed let me know. > > Dave, have you ever seen this one before? > > Marcus, can you reproduce? - if so, could you try .27-rc6 to see if it > is still valid? Can't reproduce so far. > >> [18255.940781] ====================================================== >> [18255.940789] [ INFO: hard-safe -> hard-unsafe lock order detected ] >> [18255.940792] 2.6.26.4 #1 >> [18255.940794] ------------------------------------------------------ >> [18255.940797] swapper/0 [HC0[0]:SC1[2]:HE0:SE0] is trying to acquire: >> [18255.940800] (&dev->lock.spinlock){-+..}, at: [] >> drm_lock_take+0x1c/0xc0 [drm] >> [18255.940815] >> [18255.940816] and this task is already holding: >> [18255.940818] (&dev->tasklet_lock){++..}, at: [] >> drm_locked_tasklet_func+0x1e/0x90 [drm] >> [18255.940831] which would create a new lock dependency: >> [18255.940833] (&dev->tasklet_lock){++..} -> (&dev->lock.spinlock){-+..} >> [18255.940840] >> [18255.940841] but this new dependency connects a hard-irq-safe lock: >> [18255.940843] (&dev->tasklet_lock){++..} >> [18255.940846] ... which became hard-irq-safe at: >> [18255.940848] [] __lock_acquire+0x82d/0xfb0 >> [18255.940856] [] lock_acquire+0x61/0x80 >> [18255.940862] [] _spin_lock_irqsave+0x43/0x60 >> [18255.940869] [] drm_locked_tasklet+0x4d/0xa0 [drm] >> [18255.940880] [] i915_driver_irq_handler+0x1c3/0x1f0 [i915] >> [18255.940888] [] handle_IRQ_event+0x28/0x60 >> [18255.940892] [] handle_fasteoi_irq+0x78/0xf0 >> [18255.940892] [] do_IRQ+0x79/0xc0 >> [18255.940892] [] 0xffffffff >> [18255.940892] >> [18255.940892] to a hard-irq-unsafe lock: >> [18255.940892] (&dev->lock.spinlock){-+..} >> [18255.940892] ... which became hard-irq-unsafe at: >> [18255.940892] ... [] __lock_acquire+0x606/0xfb0 >> [18255.940892] [] lock_acquire+0x61/0x80 >> [18255.940892] [] _spin_lock_bh+0x3b/0x50 >> [18255.940892] [] drm_lock+0x8e/0x310 [drm] >> [18255.940892] [] drm_ioctl+0x1b9/0x2f0 [drm] >> [18255.940892] [] vfs_ioctl+0x6b/0x80 >> [18255.940892] [] do_vfs_ioctl+0x57/0x2b0 >> [18255.940892] [] sys_ioctl+0x39/0x60 >> [18255.940892] [] sysenter_past_esp+0x6a/0xb1 >> [18255.940892] [] 0xffffffff >> [18255.940892] >> [18255.940892] other info that might help us debug this: >> [18255.940892] >> [18255.940892] 1 lock held by swapper/0: >> [18255.940892] #0: (&dev->tasklet_lock){++..}, at: [] >> drm_locked_tasklet_func+0x1e/0x90 [drm] >> [18255.940892] >> [18255.940892] the hard-irq-safe lock's dependencies: >> [18255.940892] -> (&dev->tasklet_lock){++..} ops: 0 { >> [18255.940892] initial-use at: >> [18255.940892] [] >> __lock_acquire+0x11d/0xfb0 >> [18255.940892] [] >> lock_acquire+0x61/0x80 >> [18255.940892] [] >> _spin_lock_irqsave+0x43/0x60 >> [18255.940892] [] >> drm_locked_tasklet+0x4d/0xa0 [drm] >> [18255.940892] [] >> i915_driver_irq_handler+0x1c3/0x1f0 [i915] >> [18255.940892] [] >> handle_IRQ_event+0x28/0x60 >> [18255.940892] [] >> handle_fasteoi_irq+0x78/0xf0 >> [18255.940892] [] >> do_IRQ+0x79/0xc0 >> [18255.940892] [] >> [0xffffffff >> [18255.940892] in-hardirq-W at: >> [18255.940892] [] >> __lock_acquire+0x82d/0xfb0 >> [18255.940892] [] >> lock_acquire+0x61/0x80 >> [18255.940892] [] >> _spin_lock_irqsave+0x43/0x60 >> [18255.940892] [] >> drm_locked_tasklet+0x4d/0xa0 [drm] >> [18255.940892] [] >> i915_driver_irq_handler+0x1c3/0x1f0 [i915] >> [18255.940892] [] >> handle_IRQ_event+0x28/0x60 >> [18255.940892] [] >> handle_fasteoi_irq+0x78/0xf0 >> [18255.940892] [] >> do_IRQ+0x79/0xc0 >> [18255.940892] [] >> [0xffffffff >> [18255.940892] in-softirq-W at: >> [18255.940892] [] >> __lock_acquire+0x4bf/0xfb0 >> [18255.940892] [] >> lock_acquire+0x61/0x80 >> [18255.940892] [] >> _spin_lock_irqsave+0x43/0x60 >> [18255.940892] [] >> drm_locked_tasklet_func+0x1e/0x90 [drm] >> [18255.940892] [] >> tasklet_hi_action+0x5b/0xd0 >> [18255.940892] [] >> __do_softirq+0x74/0xe0 >> [18255.940892] [] >> do_softirq+0x95/0xd0 >> [18255.940892] [] >> [0xffffffff >> [18255.940892] } >> [18255.940892] ... key at: [] __key.23164+0x0/0xffff90cb >> [[drm] 18255.940892] >> [18255.940892] the hard-irq-unsafe lock's dependencies: >> [18255.940892] -> (&dev->lock.spinlock){-+..} ops: 0 { >> [18255.940892] initial-use at: >> [18255.940892] [] >> __lock_acquire+0x11d/0xfb0 >> [18255.940892] [] >> lock_acquire+0x61/0x80 >> [18255.940892] [] >> _spin_lock_bh+0x3b/0x50 >> [18255.940892] [] >> drm_lock+0x8e/0x310 [drm] >> [18255.940892] [] >> drm_ioctl+0x1b9/0x2f0 [drm] >> [18255.940892] [] >> vfs_ioctl+0x6b/0x80 >> [18255.940892] [] >> do_vfs_ioctl+0x57/0x2b0 >> [18255.940892] [] >> sys_ioctl+0x39/0x60 >> [18255.940892] [] >> sysenter_past_esp+0x6a/0xb1 >> [18255.940892] [] >> [0xffffffff >> [18255.940892] in-softirq-W at: >> [18255.940892] [] >> __lock_acquire+0x4bf/0xfb0 >> [18255.940892] [] >> lock_acquire+0x61/0x80 >> [18255.940892] [] >> _spin_lock_bh+0x3b/0x50 >> [18255.940892] [] >> drm_lock_take+0x1c/0xc0 [drm] >> [18255.940892] [] >> drm_locked_tasklet_func+0x3a/0x90 [drm] >> [18255.940892] [] >> tasklet_hi_action+0x5b/0xd0 >> [18255.940892] [] >> __do_softirq+0x74/0xe0 >> [18255.940892] [] >> do_softirq+0x95/0xd0 >> [18255.940892] [] >> [0xffffffff >> [18255.940892] hardirq-on-W at: >> [18255.940892] [] >> __lock_acquire+0x606/0xfb0 >> [18255.940892] [] >> lock_acquire+0x61/0x80 >> [18255.940892] [] >> _spin_lock_bh+0x3b/0x50 >> [18255.940892] [] >> drm_lock+0x8e/0x310 [drm] >> [18255.940892] [] >> drm_ioctl+0x1b9/0x2f0 [drm] >> [18255.940892] [] >> vfs_ioctl+0x6b/0x80 >> [18255.940892] [] >> do_vfs_ioctl+0x57/0x2b0 >> [18255.940892] [] >> sys_ioctl+0x39/0x60 >> [18255.940892] [] >> sysenter_past_esp+0x6a/0xb1 >> [18255.940892] [] >> [0xffffffff >> [18255.940892] } >> [18255.940892] ... key at: [] __key.23165+0x0/0xffff90d3 >> [[drm] 18255.940892] >> [18255.940892] stack backtrace: >> [18255.940892] Pid: 0, comm: swapper Not tainted 2.6.26.4 #1 >> [18255.940892] [] check_usage+0x252/0x260 >> [18255.940892] [] __lock_acquire+0xae8/0xfb0 >> [18255.940892] [] lock_acquire+0x61/0x80 >> [18255.940892] [] ? drm_lock_take+0x1c/0xc0 [drm] >> [18255.940892] [] _spin_lock_bh+0x3b/0x50 >> [18255.940892] [] ? drm_lock_take+0x1c/0xc0 [drm] >> [18255.940892] [] drm_lock_take+0x1c/0xc0 [drm] >> [18255.940892] [] drm_locked_tasklet_func+0x3a/0x90 [drm] >> [18255.940892] [] tasklet_hi_action+0x5b/0xd0 >> [18255.940892] [] __do_softirq+0x74/0xe0 >> [18255.940892] [] do_softirq+0x95/0xd0 >> [18255.940892] [] ? handle_fasteoi_irq+0x0/0xf0 >> [18255.940892] [] irq_exit+0x86/0xa0 >> [18255.940892] [] do_IRQ+0x80/0xc0 >> [18255.940892] [] common_interrupt+0x2e/0x34 >> [18255.940892] [] ? tick_setup_oneshot+0x28/0x40 >> [18255.940892] [] ? acpi_idle_enter_bm+0x297/0x306 >> [18255.940892] [] cpuidle_idle_call+0x6b/0xc0 >> [18255.940892] [] ? cpuidle_idle_call+0x0/0xc0 >> [18255.940892] [] cpu_idle+0x60/0xf0 >> [18255.940892] [] rest_init+0x62/0x70 >> [18255.940892] ======================= >> >> >> -- >> 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/