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Date: Tue, 24 Jul 2012 16:36:13 -0400
From: Dave Jones <davej@...hat.com>
To: Linux Kernel <linux-kernel@...r.kernel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Subject: lockdep trace from posix timers
Linus tree as of 5fecc9d8f59e765c2a48379dd7c6f5cf88c7d75a
Dave
======================================================
[ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ]
3.5.0+ #122 Not tainted
------------------------------------------------------
trinity-child2/5327 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
blocked: (tasklist_lock){.+.+..}, instance: ffffffff81c05098, at: [<ffffffff8109762b>] posix_cpu_timer_del+0x2b/0xe0
and this task is already holding:
blocked: (&(&new_timer->it_lock)->rlock){-.-...}, instance: ffff880143bce170, at: [<ffffffff81093d49>] __lock_timer+0x89/0x1f0
which would create a new lock dependency:
(&(&new_timer->it_lock)->rlock){-.-...} -> (tasklist_lock){.+.+..}
but this new dependency connects a HARDIRQ-irq-safe lock:
(&(&new_timer->it_lock)->rlock){-.-...}
... which became HARDIRQ-irq-safe at:
[<ffffffff810d8e31>] __lock_acquire+0x7e1/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff8168a15d>] _raw_spin_lock_irqsave+0x7d/0xd0
[<ffffffff81093c17>] posix_timer_fn+0x37/0xe0
[<ffffffff8109a534>] __run_hrtimer+0x94/0x4c0
[<ffffffff8109b157>] hrtimer_interrupt+0xf7/0x230
[<ffffffff816953a9>] smp_apic_timer_interrupt+0x69/0x99
[<ffffffff8169402f>] apic_timer_interrupt+0x6f/0x80
[<ffffffff811644e9>] __generic_file_aio_write+0x239/0x450
[<ffffffff81164773>] generic_file_aio_write+0x73/0xe0
[<ffffffff81258832>] ext4_file_write+0xc2/0x280
[<ffffffff811cfb76>] do_sync_write+0xe6/0x120
[<ffffffff811d04af>] vfs_write+0xaf/0x190
[<ffffffff811d07ed>] sys_write+0x4d/0x90
[<ffffffff8169336d>] system_call_fastpath+0x1a/0x1f
to a HARDIRQ-irq-unsafe lock:
(&(&p->alloc_lock)->rlock){+.+...}
... which became HARDIRQ-irq-unsafe at:
... [<ffffffff810d8c37>] __lock_acquire+0x5e7/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff816895f6>] _raw_spin_lock+0x46/0x80
[<ffffffff811d8882>] set_task_comm+0x32/0x180
[<ffffffff81095848>] kthreadd+0x38/0x2e0
[<ffffffff81694934>] kernel_thread_helper+0x4/0x10
other info that might help us debug this:
Chain exists of:
&(&new_timer->it_lock)->rlock --> tasklist_lock --> &(&p->alloc_lock)->rlock
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&p->alloc_lock)->rlock);
local_irq_disable();
lock(&(&new_timer->it_lock)->rlock);
lock(tasklist_lock);
<Interrupt>
lock(&(&new_timer->it_lock)->rlock);
*** DEADLOCK ***
1 lock on stack by trinity-child2/5327:
#0: blocked: (&(&new_timer->it_lock)->rlock){-.-...}, instance: ffff880143bce170, at: [<ffffffff81093d49>] __lock_timer+0x89/0x1f0
the dependencies between HARDIRQ-irq-safe lock and the holding lock:
-> (&(&new_timer->it_lock)->rlock){-.-...} ops: 584 {
IN-HARDIRQ-W at:
[<ffffffff810d8e31>] __lock_acquire+0x7e1/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff8168a15d>] _raw_spin_lock_irqsave+0x7d/0xd0
[<ffffffff81093c17>] posix_timer_fn+0x37/0xe0
[<ffffffff8109a534>] __run_hrtimer+0x94/0x4c0
[<ffffffff8109b157>] hrtimer_interrupt+0xf7/0x230
[<ffffffff816953a9>] smp_apic_timer_interrupt+0x69/0x99
[<ffffffff8169402f>] apic_timer_interrupt+0x6f/0x80
[<ffffffff811644e9>] __generic_file_aio_write+0x239/0x450
[<ffffffff81164773>] generic_file_aio_write+0x73/0xe0
[<ffffffff81258832>] ext4_file_write+0xc2/0x280
[<ffffffff811cfb76>] do_sync_write+0xe6/0x120
[<ffffffff811d04af>] vfs_write+0xaf/0x190
[<ffffffff811d07ed>] sys_write+0x4d/0x90
[<ffffffff8169336d>] system_call_fastpath+0x1a/0x1f
IN-SOFTIRQ-W at:
[<ffffffff810d8bfe>] __lock_acquire+0x5ae/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff8168a15d>] _raw_spin_lock_irqsave+0x7d/0xd0
[<ffffffff81093c17>] posix_timer_fn+0x37/0xe0
[<ffffffff8109a534>] __run_hrtimer+0x94/0x4c0
[<ffffffff8109b157>] hrtimer_interrupt+0xf7/0x230
[<ffffffff8109b2bb>] __hrtimer_peek_ahead_timers.part.27+0x2b/0x30
[<ffffffff8109b309>] hrtimer_peek_ahead_timers+0x49/0xa0
[<ffffffff8109b391>] run_hrtimer_softirq+0x31/0x40
[<ffffffff810746e0>] __do_softirq+0xf0/0x400
[<ffffffff81074b2c>] run_ksoftirqd+0x13c/0x230
[<ffffffff81095517>] kthread+0xb7/0xc0
[<ffffffff81694934>] kernel_thread_helper+0x4/0x10
INITIAL USE at:
[<ffffffff810d8956>] __lock_acquire+0x306/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff8168a15d>] _raw_spin_lock_irqsave+0x7d/0xd0
[<ffffffff81093d49>] __lock_timer+0x89/0x1f0
[<ffffffff810947a4>] sys_timer_delete+0x44/0x100
[<ffffffff8169336d>] system_call_fastpath+0x1a/0x1f
}
... key at: [<ffffffff820ac8a0>] __key.29841+0x0/0x8
... acquired at:
[<ffffffff810d820b>] check_irq_usage+0x5b/0xe0
[<ffffffff810d93da>] __lock_acquire+0xd8a/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff81689b59>] _raw_read_lock+0x49/0x80
[<ffffffff8109762b>] posix_cpu_timer_del+0x2b/0xe0
[<ffffffff81094786>] sys_timer_delete+0x26/0x100
[<ffffffff8169336d>] system_call_fastpath+0x1a/0x1f
the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock:
-> (&(&p->alloc_lock)->rlock){+.+...} ops: 1189942 {
HARDIRQ-ON-W at:
[<ffffffff810d8c37>] __lock_acquire+0x5e7/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff816895f6>] _raw_spin_lock+0x46/0x80
[<ffffffff811d8882>] set_task_comm+0x32/0x180
[<ffffffff81095848>] kthreadd+0x38/0x2e0
[<ffffffff81694934>] kernel_thread_helper+0x4/0x10
SOFTIRQ-ON-W at:
[<ffffffff810d8c6c>] __lock_acquire+0x61c/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff816895f6>] _raw_spin_lock+0x46/0x80
[<ffffffff811d8882>] set_task_comm+0x32/0x180
[<ffffffff81095848>] kthreadd+0x38/0x2e0
[<ffffffff81694934>] kernel_thread_helper+0x4/0x10
INITIAL USE at:
[<ffffffff810d8956>] __lock_acquire+0x306/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff816895f6>] _raw_spin_lock+0x46/0x80
[<ffffffff811d8882>] set_task_comm+0x32/0x180
[<ffffffff81095848>] kthreadd+0x38/0x2e0
[<ffffffff81694934>] kernel_thread_helper+0x4/0x10
}
... key at: [<ffffffff820883a0>] __key.45832+0x0/0x8
... acquired at:
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff816895f6>] _raw_spin_lock+0x46/0x80
[<ffffffff812d5f2e>] keyctl_session_to_parent+0xde/0x490
[<ffffffff812d634d>] sys_keyctl+0x6d/0x1a0
[<ffffffff8169336d>] system_call_fastpath+0x1a/0x1f
-> (tasklist_lock){.+.+..} ops: 35423 {
HARDIRQ-ON-R at:
[<ffffffff810d8b1e>] __lock_acquire+0x4ce/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff81689b59>] _raw_read_lock+0x49/0x80
[<ffffffff810701a2>] do_wait+0xb2/0x360
[<ffffffff81072095>] sys_wait4+0x75/0xf0
[<ffffffff8108a482>] wait_for_helper+0x82/0xb0
[<ffffffff81694934>] kernel_thread_helper+0x4/0x10
SOFTIRQ-ON-R at:
[<ffffffff810d8c6c>] __lock_acquire+0x61c/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff81689b59>] _raw_read_lock+0x49/0x80
[<ffffffff810701a2>] do_wait+0xb2/0x360
[<ffffffff81072095>] sys_wait4+0x75/0xf0
[<ffffffff8108a482>] wait_for_helper+0x82/0xb0
[<ffffffff81694934>] kernel_thread_helper+0x4/0x10
INITIAL USE at:
[<ffffffff810d8956>] __lock_acquire+0x306/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff81689f0c>] _raw_write_lock_irq+0x5c/0xa0
[<ffffffff81068a41>] copy_process.part.22+0x1051/0x1750
[<ffffffff810692d0>] do_fork+0x140/0x4e0
[<ffffffff81024606>] kernel_thread+0x76/0x80
[<ffffffff81664602>] rest_init+0x26/0x154
[<ffffffff81efecb3>] start_kernel+0x3f8/0x405
[<ffffffff81efe356>] x86_64_start_reservations+0x131/0x135
[<ffffffff81efe4a2>] x86_64_start_kernel+0x148/0x157
}
... key at: [<ffffffff81c05098>] tasklist_lock+0x18/0x80
... acquired at:
[<ffffffff810d820b>] check_irq_usage+0x5b/0xe0
[<ffffffff810d93da>] __lock_acquire+0xd8a/0x1ae0
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff81689b59>] _raw_read_lock+0x49/0x80
[<ffffffff8109762b>] posix_cpu_timer_del+0x2b/0xe0
[<ffffffff81094786>] sys_timer_delete+0x26/0x100
[<ffffffff8169336d>] system_call_fastpath+0x1a/0x1f
stack backtrace:
Pid: 5327, comm: trinity-child2 Not tainted 3.5.0+ #122
Call Trace:
[<ffffffff810d8194>] check_usage+0x4e4/0x500
[<ffffffff81023729>] ? native_sched_clock+0x19/0x80
[<ffffffff810d59a8>] ? trace_hardirqs_off_caller+0x28/0xd0
[<ffffffff81023729>] ? native_sched_clock+0x19/0x80
[<ffffffff810d820b>] check_irq_usage+0x5b/0xe0
[<ffffffff810d93da>] __lock_acquire+0xd8a/0x1ae0
[<ffffffff810d8956>] ? __lock_acquire+0x306/0x1ae0
[<ffffffff810d59a8>] ? trace_hardirqs_off_caller+0x28/0xd0
[<ffffffff810da2a5>] ? lock_release_non_nested+0x175/0x320
[<ffffffff810da83d>] lock_acquire+0xad/0x220
[<ffffffff8109762b>] ? posix_cpu_timer_del+0x2b/0xe0
[<ffffffff81689b59>] _raw_read_lock+0x49/0x80
[<ffffffff8109762b>] ? posix_cpu_timer_del+0x2b/0xe0
[<ffffffff81093d95>] ? __lock_timer+0xd5/0x1f0
[<ffffffff8109762b>] posix_cpu_timer_del+0x2b/0xe0
[<ffffffff81094786>] sys_timer_delete+0x26/0x100
[<ffffffff8169336d>] system_call_fastpath+0x1a/0x1f
--
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