From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id 861116B0011 for ; Mon, 9 May 2011 21:05:25 -0400 (EDT) Subject: 2.6.39-rc6-mmotm0506 - lockdep splat in RCU code on page fault From: Valdis.Kletnieks@vt.edu Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1304989476_5294P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Mon, 09 May 2011 21:04:36 -0400 Message-ID: <6921.1304989476@localhost> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton , "Paul E. McKenney" , Ingo Molnar , Peter Zijlstra Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org --==_Exmh_1304989476_5294P Content-Type: text/plain; charset=us-ascii Seen at boot earlier today. Interrupt, page fault, RCU, scheduler, and MM code in the tracebacks. Yee-hah. [ 12.872150] usb 1-4: new high speed USB device number 3 using ehci_hcd [ 12.986667] usb 1-4: New USB device found, idVendor=413c, idProduct=2513 [ 12.986679] usb 1-4: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 12.987691] hub 1-4:1.0: USB hub found [ 12.987877] hub 1-4:1.0: 3 ports detected [ 12.996372] input: PS/2 Generic Mouse as /devices/platform/i8042/serio1/input/input10 [ 13.071471] udevadm used greatest stack depth: 3984 bytes left [ 13.172129] [ 13.172130] ======================================================= [ 13.172425] [ INFO: possible circular locking dependency detected ] [ 13.172650] 2.6.39-rc6-mmotm0506 #1 [ 13.172773] ------------------------------------------------------- [ 13.172997] blkid/267 is trying to acquire lock: [ 13.173009] (&p->pi_lock){-.-.-.}, at: [] try_to_wake_up+0x29/0x1aa [ 13.173009] [ 13.173009] but task is already holding lock: [ 13.173009] (rcu_node_level_0){..-...}, at: [] rcu_cpu_kthread_timer+0x27/0x58 [ 13.173009] [ 13.173009] which lock already depends on the new lock. [ 13.173009] [ 13.173009] [ 13.173009] the existing dependency chain (in reverse order) is: [ 13.173009] [ 13.173009] -> #2 (rcu_node_level_0){..-...}: [ 13.173009] [] check_prevs_add+0x8b/0x104 [ 13.173009] [] validate_chain+0x36f/0x3ab [ 13.173009] [] __lock_acquire+0x369/0x3e2 [ 13.173009] [] lock_acquire+0xfc/0x14c [ 13.173009] [] _raw_spin_lock+0x36/0x45 [ 13.173009] [] rcu_read_unlock_special+0x8c/0x1d5 [ 13.173009] [] __rcu_read_unlock+0x4f/0xd7 [ 13.173009] [] rcu_read_unlock+0x21/0x23 [ 13.173009] [] cpuacct_charge+0x6c/0x75 [ 13.173009] [] update_curr+0x101/0x12e [ 13.173009] [] check_preempt_wakeup+0xf7/0x23b [ 13.173009] [] check_preempt_curr+0x2b/0x68 [ 13.173009] [] ttwu_do_wakeup+0x76/0x128 [ 13.173009] [] ttwu_do_activate.constprop.63+0x57/0x5c [ 13.173009] [] scheduler_ipi+0x48/0x5d [ 13.173009] [] smp_reschedule_interrupt+0x16/0x18 [ 13.173009] [] reschedule_interrupt+0x13/0x20 [ 13.173009] [] rcu_read_unlock+0x21/0x23 [ 13.173009] [] find_get_page+0xa9/0xb9 [ 13.173009] [] filemap_fault+0x6a/0x34d [ 13.173009] [] __do_fault+0x54/0x3e6 [ 13.173009] [] handle_pte_fault+0x12c/0x1ed [ 13.173009] [] handle_mm_fault+0x1cd/0x1e0 [ 13.173009] [] do_page_fault+0x42d/0x5de [ 13.173009] [] page_fault+0x1f/0x30 [ 13.173009] [ 13.173009] -> #1 (&rq->lock){-.-.-.}: [ 13.173009] [] check_prevs_add+0x8b/0x104 [ 13.173009] [] validate_chain+0x36f/0x3ab [ 13.173009] [] __lock_acquire+0x369/0x3e2 [ 13.173009] [] lock_acquire+0xfc/0x14c [ 13.173009] [] _raw_spin_lock+0x36/0x45 [ 13.173009] [] __task_rq_lock+0x8b/0xd3 [ 13.173009] [] wake_up_new_task+0x41/0x108 [ 13.173009] [] do_fork+0x265/0x33f [ 13.173009] [] kernel_thread+0x6b/0x6d [ 13.173009] [] rest_init+0x21/0xd2 [ 13.173009] [] start_kernel+0x3bb/0x3c6 [ 13.173009] [] x86_64_start_reservations+0xaf/0xb3 [ 13.173009] [] x86_64_start_kernel+0xf0/0xf7 [ 13.173009] [ 13.173009] -> #0 (&p->pi_lock){-.-.-.}: [ 13.173009] [] check_prev_add+0x68/0x20e [ 13.173009] [] check_prevs_add+0x8b/0x104 [ 13.173009] [] validate_chain+0x36f/0x3ab [ 13.173009] [] __lock_acquire+0x369/0x3e2 [ 13.173009] [] lock_acquire+0xfc/0x14c [ 13.173009] [] _raw_spin_lock_irqsave+0x44/0x57 [ 13.173009] [] try_to_wake_up+0x29/0x1aa [ 13.173009] [] wake_up_process+0x10/0x12 [ 13.173009] [] rcu_cpu_kthread_timer+0x44/0x58 [ 13.173009] [] call_timer_fn+0xac/0x1e9 [ 13.173009] [] run_timer_softirq+0x1aa/0x1f2 [ 13.173009] [] __do_softirq+0x109/0x26a [ 13.173009] [] call_softirq+0x1c/0x30 [ 13.173009] [] do_softirq+0x44/0xf1 [ 13.173009] [] irq_exit+0x58/0xc8 [ 13.173009] [] smp_apic_timer_interrupt+0x79/0x87 [ 13.173009] [] apic_timer_interrupt+0x13/0x20 [ 13.173009] [] get_page_from_freelist+0x2aa/0x310 [ 13.173009] [] __alloc_pages_nodemask+0x178/0x243 [ 13.173009] [] pte_alloc_one+0x1e/0x3a [ 13.173009] [] __pte_alloc+0x22/0x14b [ 13.173009] [] handle_mm_fault+0x17e/0x1e0 [ 13.173009] [] do_page_fault+0x42d/0x5de [ 13.173009] [] page_fault+0x1f/0x30 [ 13.173009] [ 13.173009] other info that might help us debug this: [ 13.173009] [ 13.173009] Chain exists of: [ 13.173009] &p->pi_lock --> &rq->lock --> rcu_node_level_0 [ 13.173009] [ 13.173009] Possible unsafe locking scenario: [ 13.173009] [ 13.173009] CPU0 CPU1 [ 13.173009] ---- ---- [ 13.173009] lock(rcu_node_level_0); [ 13.173009] lock(&rq->lock); [ 13.173009] lock(rcu_node_level_0); [ 13.173009] lock(&p->pi_lock); [ 13.173009] [ 13.173009] *** DEADLOCK *** [ 13.173009] [ 13.173009] 3 locks held by blkid/267: [ 13.173009] #0: (&mm->mmap_sem){++++++}, at: [] do_page_fault+0x1f3/0x5de [ 13.173009] #1: (&yield_timer){+.-...}, at: [] call_timer_fn+0x0/0x1e9 [ 13.173009] #2: (rcu_node_level_0){..-...}, at: [] rcu_cpu_kthread_timer+0x27/0x58 [ 13.173009] [ 13.173009] stack backtrace: [ 13.173009] Pid: 267, comm: blkid Not tainted 2.6.39-rc6-mmotm0506 #1 [ 13.173009] Call Trace: [ 13.173009] [] print_circular_bug+0xc8/0xd9 [ 13.173009] [] check_prev_add+0x68/0x20e [ 13.173009] [] ? save_stack_trace+0x28/0x46 [ 13.173009] [] check_prevs_add+0x8b/0x104 [ 13.173009] [] validate_chain+0x36f/0x3ab [ 13.173009] [] __lock_acquire+0x369/0x3e2 [ 13.173009] [] ? try_to_wake_up+0x29/0x1aa [ 13.173009] [] lock_acquire+0xfc/0x14c [ 13.173009] [] ? try_to_wake_up+0x29/0x1aa [ 13.173009] [] ? rcu_check_quiescent_state+0x82/0x82 [ 13.173009] [] _raw_spin_lock_irqsave+0x44/0x57 [ 13.173009] [] ? try_to_wake_up+0x29/0x1aa [ 13.173009] [] try_to_wake_up+0x29/0x1aa [ 13.173009] [] ? rcu_check_quiescent_state+0x82/0x82 [ 13.173009] [] wake_up_process+0x10/0x12 [ 13.173009] [] rcu_cpu_kthread_timer+0x44/0x58 [ 13.173009] [] ? rcu_check_quiescent_state+0x82/0x82 [ 13.173009] [] call_timer_fn+0xac/0x1e9 [ 13.173009] [] ? del_timer+0x75/0x75 [ 13.173009] [] ? rcu_check_quiescent_state+0x82/0x82 [ 13.173009] [] run_timer_softirq+0x1aa/0x1f2 [ 13.173009] [] __do_softirq+0x109/0x26a [ 13.173009] [] ? tick_dev_program_event+0x37/0xf6 [ 13.173009] [] ? time_hardirqs_off+0x1b/0x2f [ 13.173009] [] call_softirq+0x1c/0x30 [ 13.173009] [] do_softirq+0x44/0xf1 [ 13.173009] [] irq_exit+0x58/0xc8 [ 13.173009] [] smp_apic_timer_interrupt+0x79/0x87 [ 13.173009] [] apic_timer_interrupt+0x13/0x20 [ 13.173009] [] ? get_page_from_freelist+0x114/0x310 [ 13.173009] [] ? get_page_from_freelist+0x2aa/0x310 [ 13.173009] [] ? clear_page_c+0x7/0x10 [ 13.173009] [] ? prep_new_page+0x14c/0x1cd [ 13.173009] [] get_page_from_freelist+0x2aa/0x310 [ 13.173009] [] __alloc_pages_nodemask+0x178/0x243 [ 13.173009] [] ? __pmd_alloc+0x87/0x99 [ 13.173009] [] pte_alloc_one+0x1e/0x3a [ 13.173009] [] ? __pmd_alloc+0x87/0x99 [ 13.173009] [] __pte_alloc+0x22/0x14b [ 13.173009] [] handle_mm_fault+0x17e/0x1e0 [ 13.173009] [] do_page_fault+0x42d/0x5de [ 13.173009] [] ? sys_brk+0x32/0x10c [ 13.173009] [] ? time_hardirqs_off+0x1b/0x2f [ 13.173009] [] ? trace_hardirqs_off_caller+0x3f/0x9c [ 13.173009] [] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 13.173009] [] page_fault+0x1f/0x30 [ 14.010075] usb 5-1: new full speed USB device number 2 using uhci_hcd --==_Exmh_1304989476_5294P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFNyI8kcC3lWbTT17ARAivMAKCNgfkyh7qlP5u9AF8ZaojX0WfmDQCgoUc5 NIpIvMs2pX2Pwwk4IVn5WtI= =fIEL -----END PGP SIGNATURE----- --==_Exmh_1304989476_5294P-- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. 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