mirror of
https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git
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| Filename | Latest commit message | Latest commit date |
|---|---|---|
8826f3b039
This commit switches manipulations of the rcu_node ->wakemask field to atomic operations, which allows rcu_cpu_kthread_timer() to avoid acquiring the rcu_node lock. This should avoid the following lockdep splat reported by Valdis Kletnieks: [ 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: [<ffffffff81032d8f>] try_to_wake_up+0x29/0x1aa [ 13.173009] [ 13.173009] but task is already holding lock: [ 13.173009] (rcu_node_level_0){..-...}, at: [<ffffffff810901cc>] 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] [<ffffffff810679b9>] check_prevs_add+0x8b/0x104 [ 13.173009] [<ffffffff81067da1>] validate_chain+0x36f/0x3ab [ 13.173009] [<ffffffff8106846b>] __lock_acquire+0x369/0x3e2 [ 13.173009] [<ffffffff81068a0f>] lock_acquire+0xfc/0x14c [ 13.173009] [<ffffffff815697f1>] _raw_spin_lock+0x36/0x45 [ 13.173009] [<ffffffff81090794>] rcu_read_unlock_special+0x8c/0x1d5 [ 13.173009] [<ffffffff8109092c>] __rcu_read_unlock+0x4f/0xd7 [ 13.173009] [<ffffffff81027bd3>] rcu_read_unlock+0x21/0x23 [ 13.173009] [<ffffffff8102cc34>] cpuacct_charge+0x6c/0x75 [ 13.173009] [<ffffffff81030cc6>] update_curr+0x101/0x12e [ 13.173009] [<ffffffff810311d0>] check_preempt_wakeup+0xf7/0x23b [ 13.173009] [<ffffffff8102acb3>] check_preempt_curr+0x2b/0x68 [ 13.173009] [<ffffffff81031d40>] ttwu_do_wakeup+0x76/0x128 [ 13.173009] [<ffffffff81031e49>] ttwu_do_activate.constprop.63+0x57/0x5c [ 13.173009] [<ffffffff81031e96>] scheduler_ipi+0x48/0x5d [ 13.173009] [<ffffffff810177d5>] smp_reschedule_interrupt+0x16/0x18 [ 13.173009] [<ffffffff815710f3>] reschedule_interrupt+0x13/0x20 [ 13.173009] [<ffffffff810b66d1>] rcu_read_unlock+0x21/0x23 [ 13.173009] [<ffffffff810b739c>] find_get_page+0xa9/0xb9 [ 13.173009] [<ffffffff810b8b48>] filemap_fault+0x6a/0x34d [ 13.173009] [<ffffffff810d1a25>] __do_fault+0x54/0x3e6 [ 13.173009] [<ffffffff810d447a>] handle_pte_fault+0x12c/0x1ed [ 13.173009] [<ffffffff810d48f7>] handle_mm_fault+0x1cd/0x1e0 [ 13.173009] [<ffffffff8156cfee>] do_page_fault+0x42d/0x5de [ 13.173009] [<ffffffff8156a75f>] page_fault+0x1f/0x30 [ 13.173009] [ 13.173009] -> #1 (&rq->lock){-.-.-.}: [ 13.173009] [<ffffffff810679b9>] check_prevs_add+0x8b/0x104 [ 13.173009] [<ffffffff81067da1>] validate_chain+0x36f/0x3ab [ 13.173009] [<ffffffff8106846b>] __lock_acquire+0x369/0x3e2 [ 13.173009] [<ffffffff81068a0f>] lock_acquire+0xfc/0x14c [ 13.173009] [<ffffffff815697f1>] _raw_spin_lock+0x36/0x45 [ 13.173009] [<ffffffff81027e19>] __task_rq_lock+0x8b/0xd3 [ 13.173009] [<ffffffff81032f7f>] wake_up_new_task+0x41/0x108 [ 13.173009] [<ffffffff810376c3>] do_fork+0x265/0x33f [ 13.173009] [<ffffffff81007d02>] kernel_thread+0x6b/0x6d [ 13.173009] [<ffffffff8153a9dd>] rest_init+0x21/0xd2 [ 13.173009] [<ffffffff81b1db4f>] start_kernel+0x3bb/0x3c6 [ 13.173009] [<ffffffff81b1d29f>] x86_64_start_reservations+0xaf/0xb3 [ 13.173009] [<ffffffff81b1d393>] x86_64_start_kernel+0xf0/0xf7 [ 13.173009] [ 13.173009] -> #0 (&p->pi_lock){-.-.-.}: [ 13.173009] [<ffffffff81067788>] check_prev_add+0x68/0x20e [ 13.173009] [<ffffffff810679b9>] check_prevs_add+0x8b/0x104 [ 13.173009] [<ffffffff81067da1>] validate_chain+0x36f/0x3ab [ 13.173009] [<ffffffff8106846b>] __lock_acquire+0x369/0x3e2 [ 13.173009] [<ffffffff81068a0f>] lock_acquire+0xfc/0x14c [ 13.173009] [<ffffffff815698ea>] _raw_spin_lock_irqsave+0x44/0x57 [ 13.173009] [<ffffffff81032d8f>] try_to_wake_up+0x29/0x1aa [ 13.173009] [<ffffffff81032f3c>] wake_up_process+0x10/0x12 [ 13.173009] [<ffffffff810901e9>] rcu_cpu_kthread_timer+0x44/0x58 [ 13.173009] [<ffffffff81045286>] call_timer_fn+0xac/0x1e9 [ 13.173009] [<ffffffff8104556d>] run_timer_softirq+0x1aa/0x1f2 [ 13.173009] [<ffffffff8103e487>] __do_softirq+0x109/0x26a [ 13.173009] [<ffffffff8157144c>] call_softirq+0x1c/0x30 [ 13.173009] [<ffffffff81003207>] do_softirq+0x44/0xf1 [ 13.173009] [<ffffffff8103e8b9>] irq_exit+0x58/0xc8 [ 13.173009] [<ffffffff81017f5a>] smp_apic_timer_interrupt+0x79/0x87 [ 13.173009] [<ffffffff81570fd3>] apic_timer_interrupt+0x13/0x20 [ 13.173009] [<ffffffff810bd51a>] get_page_from_freelist+0x2aa/0x310 [ 13.173009] [<ffffffff810bdf03>] __alloc_pages_nodemask+0x178/0x243 [ 13.173009] [<ffffffff8101fe2f>] pte_alloc_one+0x1e/0x3a [ 13.173009] [<ffffffff810d27fe>] __pte_alloc+0x22/0x14b [ 13.173009] [<ffffffff810d48a8>] handle_mm_fault+0x17e/0x1e0 [ 13.173009] [<ffffffff8156cfee>] do_page_fault+0x42d/0x5de [ 13.173009] [<ffffffff8156a75f>] 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: [<ffffffff8156cdb4>] do_page_fault+0x1f3/0x5de [ 13.173009] #1: (&yield_timer){+.-...}, at: [<ffffffff810451da>] call_timer_fn+0x0/0x1e9 [ 13.173009] #2: (rcu_node_level_0){..-...}, at: [<ffffffff810901cc>] 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] <IRQ> [<ffffffff8154a529>] print_circular_bug+0xc8/0xd9 [ 13.173009] [<ffffffff81067788>] check_prev_add+0x68/0x20e [ 13.173009] [<ffffffff8100c861>] ? save_stack_trace+0x28/0x46 [ 13.173009] [<ffffffff810679b9>] check_prevs_add+0x8b/0x104 [ 13.173009] [<ffffffff81067da1>] validate_chain+0x36f/0x3ab [ 13.173009] [<ffffffff8106846b>] __lock_acquire+0x369/0x3e2 [ 13.173009] [<ffffffff81032d8f>] ? try_to_wake_up+0x29/0x1aa [ 13.173009] [<ffffffff81068a0f>] lock_acquire+0xfc/0x14c [ 13.173009] [<ffffffff81032d8f>] ? try_to_wake_up+0x29/0x1aa [ 13.173009] [<ffffffff810901a5>] ? rcu_check_quiescent_state+0x82/0x82 [ 13.173009] [<ffffffff815698ea>] _raw_spin_lock_irqsave+0x44/0x57 [ 13.173009] [<ffffffff81032d8f>] ? try_to_wake_up+0x29/0x1aa [ 13.173009] [<ffffffff81032d8f>] try_to_wake_up+0x29/0x1aa [ 13.173009] [<ffffffff810901a5>] ? rcu_check_quiescent_state+0x82/0x82 [ 13.173009] [<ffffffff81032f3c>] wake_up_process+0x10/0x12 [ 13.173009] [<ffffffff810901e9>] rcu_cpu_kthread_timer+0x44/0x58 [ 13.173009] [<ffffffff810901a5>] ? rcu_check_quiescent_state+0x82/0x82 [ 13.173009] [<ffffffff81045286>] call_timer_fn+0xac/0x1e9 [ 13.173009] [<ffffffff810451da>] ? del_timer+0x75/0x75 [ 13.173009] [<ffffffff810901a5>] ? rcu_check_quiescent_state+0x82/0x82 [ 13.173009] [<ffffffff8104556d>] run_timer_softirq+0x1aa/0x1f2 [ 13.173009] [<ffffffff8103e487>] __do_softirq+0x109/0x26a [ 13.173009] [<ffffffff8106365f>] ? tick_dev_program_event+0x37/0xf6 [ 13.173009] [<ffffffff810a0e4a>] ? time_hardirqs_off+0x1b/0x2f [ 13.173009] [<ffffffff8157144c>] call_softirq+0x1c/0x30 [ 13.173009] [<ffffffff81003207>] do_softirq+0x44/0xf1 [ 13.173009] [<ffffffff8103e8b9>] irq_exit+0x58/0xc8 [ 13.173009] [<ffffffff81017f5a>] smp_apic_timer_interrupt+0x79/0x87 [ 13.173009] [<ffffffff81570fd3>] apic_timer_interrupt+0x13/0x20 [ 13.173009] <EOI> [<ffffffff810bd384>] ? get_page_from_freelist+0x114/0x310 [ 13.173009] [<ffffffff810bd51a>] ? get_page_from_freelist+0x2aa/0x310 [ 13.173009] [<ffffffff812220e7>] ? clear_page_c+0x7/0x10 [ 13.173009] [<ffffffff810bd1ef>] ? prep_new_page+0x14c/0x1cd [ 13.173009] [<ffffffff810bd51a>] get_page_from_freelist+0x2aa/0x310 [ 13.173009] [<ffffffff810bdf03>] __alloc_pages_nodemask+0x178/0x243 [ 13.173009] [<ffffffff810d46b9>] ? __pmd_alloc+0x87/0x99 [ 13.173009] [<ffffffff8101fe2f>] pte_alloc_one+0x1e/0x3a [ 13.173009] [<ffffffff810d46b9>] ? __pmd_alloc+0x87/0x99 [ 13.173009] [<ffffffff810d27fe>] __pte_alloc+0x22/0x14b [ 13.173009] [<ffffffff810d48a8>] handle_mm_fault+0x17e/0x1e0 [ 13.173009] [<ffffffff8156cfee>] do_page_fault+0x42d/0x5de [ 13.173009] [<ffffffff810d915f>] ? sys_brk+0x32/0x10c [ 13.173009] [<ffffffff810a0e4a>] ? time_hardirqs_off+0x1b/0x2f [ 13.173009] [<ffffffff81065c4f>] ? trace_hardirqs_off_caller+0x3f/0x9c [ 13.173009] [<ffffffff812235dd>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 13.173009] [<ffffffff8156a75f>] page_fault+0x1f/0x30 [ 14.010075] usb 5-1: new full speed USB device number 2 using uhci_hcd Reported-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu> Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> |
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| .. | ||
| debug | ||
| events | ||
| gcov | ||
| irq | ||
| power | ||
| time | ||
| trace | ||
| .gitignore | ||
| acct.c | ||
| async.c | ||
| audit.c | ||
| audit.h | ||
| audit_tree.c | ||
| audit_watch.c | ||
| auditfilter.c | ||
| auditsc.c | ||
| backtracetest.c | ||
| bounds.c | ||
| capability.c | ||
| cgroup.c | ||
| cgroup_freezer.c | ||
| compat.c | ||
| configs.c | ||
| cpu.c | ||
| cpuset.c | ||
| crash_dump.c | ||
| cred.c | ||
| delayacct.c | ||
| dma.c | ||
| elfcore.c | ||
| exec_domain.c | ||
| exit.c | ||
| extable.c | ||
| fork.c | ||
| freezer.c | ||
| futex.c | ||
| futex_compat.c | ||
| groups.c | ||
| hrtimer.c | ||
| hung_task.c | ||
| irq_work.c | ||
| itimer.c | ||
| jump_label.c | ||
| kallsyms.c | ||
| Kconfig.freezer | ||
| Kconfig.hz | ||
| Kconfig.locks | ||
| Kconfig.preempt | ||
| kexec.c | ||
| kfifo.c | ||
| kmod.c | ||
| kprobes.c | ||
| ksysfs.c | ||
| kthread.c | ||
| latencytop.c | ||
| lockdep.c | ||
| lockdep_internals.h | ||
| lockdep_proc.c | ||
| lockdep_states.h | ||
| Makefile | ||
| module.c | ||
| mutex-debug.c | ||
| mutex-debug.h | ||
| mutex.c | ||
| mutex.h | ||
| notifier.c | ||
| nsproxy.c | ||
| padata.c | ||
| panic.c | ||
| params.c | ||
| pid.c | ||
| pid_namespace.c | ||
| pm_qos_params.c | ||
| posix-cpu-timers.c | ||
| posix-timers.c | ||
| printk.c | ||
| profile.c | ||
| ptrace.c | ||
| range.c | ||
| rcupdate.c | ||
| rcutiny.c | ||
| rcutiny_plugin.h | ||
| rcutorture.c | ||
| rcutree.c | ||
| rcutree.h | ||
| rcutree_plugin.h | ||
| rcutree_trace.c | ||
| relay.c | ||
| res_counter.c | ||
| resource.c | ||
| rtmutex-debug.c | ||
| rtmutex-debug.h | ||
| rtmutex-tester.c | ||
| rtmutex.c | ||
| rtmutex.h | ||
| rtmutex_common.h | ||
| rwsem.c | ||
| sched.c | ||
| sched_autogroup.c | ||
| sched_autogroup.h | ||
| sched_clock.c | ||
| sched_cpupri.c | ||
| sched_cpupri.h | ||
| sched_debug.c | ||
| sched_fair.c | ||
| sched_features.h | ||
| sched_idletask.c | ||
| sched_rt.c | ||
| sched_stats.h | ||
| sched_stoptask.c | ||
| seccomp.c | ||
| semaphore.c | ||
| signal.c | ||
| smp.c | ||
| softirq.c | ||
| spinlock.c | ||
| srcu.c | ||
| stacktrace.c | ||
| stop_machine.c | ||
| sys.c | ||
| sys_ni.c | ||
| sysctl.c | ||
| sysctl_binary.c | ||
| sysctl_check.c | ||
| taskstats.c | ||
| test_kprobes.c | ||
| time.c | ||
| timeconst.pl | ||
| timer.c | ||
| tracepoint.c | ||
| tsacct.c | ||
| uid16.c | ||
| up.c | ||
| user-return-notifier.c | ||
| user.c | ||
| user_namespace.c | ||
| utsname.c | ||
| utsname_sysctl.c | ||
| wait.c | ||
| watchdog.c | ||
| workqueue.c | ||
| workqueue_sched.h | ||