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Message-ID: <20080517172612.GA3522@codemonkey.org.uk>
Date: Sat, 17 May 2008 13:26:12 -0400
From: Dave Jones <davej@...emonkey.org.uk>
To: Linux Kernel <linux-kernel@...r.kernel.org>
Cc: stsp@...rs.sourceforge.net
Subject: pcspkr lockdep trace.
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.26-0.13.rc2.git5.fc10.x86_64 #1
-------------------------------------------------------
ksoftirqd/0/4 is trying to acquire lock:
(&pcsp_chip.substream_lock){++..}, at: [<ffffffffa0265333>] pcsp_do_timer+0x5a/0x2b3 [snd_pcsp]
but task is already holding lock:
(&cpu_base->lock){++..}, at: [<ffffffff8104e0a8>] hrtimer_interrupt+0x79/0x14f
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&cpu_base->lock){++..}:
[<ffffffff81058334>] __lock_acquire+0xbcf/0xd5f
[<ffffffff81058522>] lock_acquire+0x5e/0x78
[<ffffffff812b1e5d>] _spin_lock_irqsave+0x36/0x69
[<ffffffff8104da9a>] lock_hrtimer_base+0x25/0x4b
[<ffffffff8104dc76>] hrtimer_start+0x24/0x15e
[<ffffffff8102dccc>] enqueue_rt_entity+0x212/0x23d
[<ffffffff8102dfcd>] enqueue_task_rt+0x60/0x89
[<ffffffff81027844>] enqueue_task+0x4d/0x58
[<ffffffff81027871>] activate_task+0x22/0x2a
[<ffffffff8102ceab>] try_to_wake_up+0x186/0x1dd
[<ffffffff8102cf2e>] wake_up_process+0x10/0x12
[<ffffffff812ac90c>] migration_call+0xdf/0x4d3
[<ffffffff815164e7>] migration_init+0x46/0x57
[<ffffffff815035ce>] kernel_init+0x5f/0x344
[<ffffffff8100cec8>] child_rip+0xa/0x12
[<ffffffffffffffff>] 0xffffffffffffffff
-> #3 (&rt_b->rt_runtime_lock){+...}:
[<ffffffff81058334>] __lock_acquire+0xbcf/0xd5f
[<ffffffff81058522>] lock_acquire+0x5e/0x78
[<ffffffff812b1d47>] _spin_lock+0x26/0x53
[<ffffffff8102dc99>] enqueue_rt_entity+0x1df/0x23d
[<ffffffff8102dfcd>] enqueue_task_rt+0x60/0x89
[<ffffffff81027844>] enqueue_task+0x4d/0x58
[<ffffffff81027871>] activate_task+0x22/0x2a
[<ffffffff8102ceab>] try_to_wake_up+0x186/0x1dd
[<ffffffff8102cf2e>] wake_up_process+0x10/0x12
[<ffffffff812ac90c>] migration_call+0xdf/0x4d3
[<ffffffff815164e7>] migration_init+0x46/0x57
[<ffffffff815035ce>] kernel_init+0x5f/0x344
[<ffffffff8100cec8>] child_rip+0xa/0x12
[<ffffffffffffffff>] 0xffffffffffffffff
-> #2 (&rq->rq_lock_key){++..}:
[<ffffffff81058334>] __lock_acquire+0xbcf/0xd5f
[<ffffffff81058522>] lock_acquire+0x5e/0x78
[<ffffffff812b1d47>] _spin_lock+0x26/0x53
[<ffffffff8102c5a4>] task_rq_lock+0x42/0x78
[<ffffffff8102cd59>] try_to_wake_up+0x34/0x1dd
[<ffffffff8102cf2e>] wake_up_process+0x10/0x12
[<ffffffff8103c1b8>] __tasklet_schedule+0x86/0xa6
[<ffffffffa02651d1>] snd_pcsp_trigger+0xac/0xbe [snd_pcsp]
[<ffffffffa0146b97>] snd_pcm_do_start+0x27/0x29 [snd_pcm]
[<ffffffffa0146ad5>] snd_pcm_action_single+0x2d/0x5b [snd_pcm]
[<ffffffffa0148779>] snd_pcm_action_lock_irq+0x86/0xac [snd_pcm]
[<ffffffffa014aebe>] snd_pcm_common_ioctl1+0x4c0/0xcee [snd_pcm]
[<ffffffffa014bbe3>] snd_pcm_playback_ioctl1+0x252/0x26f [snd_pcm]
[<ffffffffa014c49e>] snd_pcm_playback_ioctl+0x2e/0x36 [snd_pcm]
[<ffffffff810bdf9a>] vfs_ioctl+0x2a/0x78
[<ffffffff810be239>] do_vfs_ioctl+0x251/0x26b
[<ffffffff810be2a8>] sys_ioctl+0x55/0x79
[<ffffffff8100c120>] tracesys+0xd5/0xda
[<ffffffffffffffff>] 0xffffffffffffffff
-> #1 (&substream->self_group.lock){.+..}:
[<ffffffffffffffff>] 0xffffffffffffffff
-> #0 (&pcsp_chip.substream_lock){++..}:
[<ffffffffffffffff>] 0xffffffffffffffff
other info that might help us debug this:
1 lock held by ksoftirqd/0/4:
#0: (&cpu_base->lock){++..}, at: [<ffffffff8104e0a8>] hrtimer_interrupt+0x79/0x14f
stack backtrace:
Pid: 4, comm: ksoftirqd/0 Not tainted 2.6.26-0.13.rc2.git5.fc10.x86_64 #1
Call Trace:
<IRQ> [<ffffffff810574ca>] print_circular_bug_tail+0x70/0x7b
[<ffffffff810572e2>] ? print_circular_bug_entry+0x48/0x4f
[<ffffffff81058237>] __lock_acquire+0xad2/0xd5f
[<ffffffff81011dc7>] ? native_sched_clock+0x50/0x6d
[<ffffffff81011dc7>] ? native_sched_clock+0x50/0x6d
[<ffffffff8104dffe>] ? ktime_get+0x11/0x42
[<ffffffff81058522>] lock_acquire+0x5e/0x78
[<ffffffffa0265333>] ? :snd_pcsp:pcsp_do_timer+0x5a/0x2b3
[<ffffffff812b1e5d>] _spin_lock_irqsave+0x36/0x69
[<ffffffff812b1bf1>] ? _spin_unlock_irq+0x2b/0x30
[<ffffffffa02652d9>] ? :snd_pcsp:pcsp_do_timer+0x0/0x2b3
[<ffffffffa0265333>] :snd_pcsp:pcsp_do_timer+0x5a/0x2b3
[<ffffffff8104e128>] ? hrtimer_interrupt+0xf9/0x14f
[<ffffffffa02652d9>] ? :snd_pcsp:pcsp_do_timer+0x0/0x2b3
[<ffffffff8104d4bc>] __run_hrtimer+0x79/0xa7
[<ffffffff8104e113>] hrtimer_interrupt+0xe4/0x14f
[<ffffffff8101aa65>] smp_apic_timer_interrupt+0x85/0xa3
[<ffffffff8100cceb>] apic_timer_interrupt+0x6b/0x70
<EOI> [<ffffffff812b1c38>] ? _spin_unlock_irqrestore+0x42/0x47
[<ffffffff8104db82>] ? hrtimer_try_to_cancel+0x85/0x92
[<ffffffff8104dba3>] ? hrtimer_cancel+0x14/0x20
[<ffffffff812aeef6>] ? schedule+0x135/0x825
[<ffffffff8100e4d8>] ? do_softirq+0x84/0x8a
[<ffffffff8103c28d>] ? ksoftirqd+0x34/0xcf
[<ffffffff8103c259>] ? ksoftirqd+0x0/0xcf
[<ffffffff8104a9e7>] ? kthread+0x49/0x76
[<ffffffff8100cec8>] ? child_rip+0xa/0x12
[<ffffffff8100c5df>] ? restore_args+0x0/0x30
[<ffffffff8104a99e>] ? kthread+0x0/0x76
[<ffffffff8100cebe>] ? child_rip+0x0/0x12
--
http://www.codemonkey.org.uk
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