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Date: Thu, 8 Jan 2009 16:20:37 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Takashi Iwai <tiwai@...e.de>
Cc: linux-kernel@...r.kernel.org,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Wu Fengguang <wfg@...ux.intel.com>
Subject: [bug] sound: INFO: possible recursive locking detected
FYI, -tip testing found this new lockdep workqueue locking assert
triggered by the Intel HDA sound driver:
[ 30.637612] alloc kstat_irqs on cpu 0 node 0
[ 30.647029] IOAPIC[0]: Set routing entry (2-22 -> 0x71 -> IRQ 22 Mode:1 Active:1)
[ 30.654533] HDA Intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
[ 30.661782] HDA Intel 0000:00:1b.0: setting latency timer to 64
[ 30.667801] chipset global capabilities = 0x4401
[ 30.701090] codec_mask = 0x4
[ 30.701090] hda_intel: codec #2 probed OK
[ 30.709090] hda-codec: No codec parser is available
[ 30.714396] hda-intel: no codecs initialized
[ 30.718689]
[ 30.718689] =============================================
[ 30.718689] [ INFO: possible recursive locking detected ]
[ 30.718689] 2.6.28-tip #2
[ 30.718689] ---------------------------------------------
[ 30.718689] events/0/7 is trying to acquire lock:
[ 30.718689] (events){--..}, at: [<ffffffff80281050>] flush_workqueue+0x0/0x90
[ 30.718689]
[ 30.718689] but task is already holding lock:
[ 30.718689] (events){--..}, at: [<ffffffff8028076a>] run_workqueue+0x14a/0x240
[ 30.718689]
[ 30.718689] other info that might help us debug this:
[ 30.718689] 2 locks held by events/0/7:
[ 30.718689] #0: (events){--..}, at: [<ffffffff8028076a>] run_workqueue+0x14a/0x240
[ 30.718689] #1: (&wfc.work){--..}, at: [<ffffffff8028076a>] run_workqueue+0x14a/0x240
[ 30.718689]
[ 30.718689] stack backtrace:
[ 30.718689] Pid: 7, comm: events/0 Not tainted 2.6.28-tip #2
[ 30.718689] Call Trace:
[ 30.718689] [<ffffffff80295836>] validate_chain+0xc56/0x1340
[ 30.718689] [<ffffffff802974e6>] __lock_acquire+0x376/0x610
[ 30.718689] [<ffffffff80297819>] lock_acquire+0x99/0xd0
[ 30.718689] [<ffffffff80281050>] ? flush_workqueue+0x0/0x90
[ 30.718689] [<ffffffff80281091>] flush_workqueue+0x41/0x90
[ 30.718689] [<ffffffff80281050>] ? flush_workqueue+0x0/0x90
[ 30.718689] [<ffffffff802810f5>] flush_scheduled_work+0x15/0x20
[ 30.718689] [<ffffffff80c59794>] azx_clear_irq_pending+0x54/0x60
[ 30.718689] [<ffffffff80c599ec>] azx_free+0x10c/0x160
[ 30.718689] [<ffffffff80bae9ad>] ? snd_device_free+0x8d/0x100
[ 30.718689] [<ffffffff80c59a52>] azx_dev_free+0x12/0x20
[ 30.718689] [<ffffffff80bae9a1>] snd_device_free+0x81/0x100
[ 30.718689] [<ffffffff80baea89>] snd_device_free_all+0x69/0xa0
[ 30.718689] [<ffffffff80ba8a70>] snd_card_do_free+0x50/0xd0
[ 30.718689] [<ffffffff80ba9602>] snd_card_free+0xa2/0xc0
[ 30.718689] [<ffffffff8061115f>] ? __delay+0xf/0x20
[ 30.718689] [<ffffffff80edbb6a>] azx_probe+0x38a/0x9f0
[ 30.718689] [<ffffffff80c5a240>] ? azx_send_cmd+0x0/0x130
[ 30.718689] [<ffffffff80c5a370>] ? azx_get_response+0x0/0x210
[ 30.718689] [<ffffffff80c59b70>] ? azx_attach_pcm_stream+0x0/0x1b0
[ 30.718689] [<ffffffff802804d0>] ? do_work_for_cpu+0x0/0x30
[ 30.718689] [<ffffffff80634807>] local_pci_probe+0x17/0x20
[ 30.718689] [<ffffffff802804e8>] do_work_for_cpu+0x18/0x30
[ 30.718689] [<ffffffff802804d0>] ? do_work_for_cpu+0x0/0x30
[ 30.718689] [<ffffffff802807bb>] run_workqueue+0x19b/0x240
[ 30.718689] [<ffffffff8028076a>] ? run_workqueue+0x14a/0x240
[ 30.718689] [<ffffffff802809cf>] worker_thread+0xaf/0x110
[ 30.718689] [<ffffffff80284e20>] ? autoremove_wake_function+0x0/0x40
[ 30.718689] [<ffffffff80280920>] ? worker_thread+0x0/0x110
[ 30.718689] [<ffffffff802848e3>] kthread+0x53/0x80
[ 30.718689] [<ffffffff8022c3aa>] child_rip+0xa/0x20
[ 30.718689] [<ffffffff8022bcbe>] ? restore_args+0x0/0x30
[ 30.718689] [<ffffffff80284890>] ? kthread+0x0/0x80
[ 30.718689] [<ffffffff8022c3a0>] ? child_rip+0x0/0x20
[ 30.993230] HDA Intel 0000:00:1b.0: PCI INT A disabled
[ 30.998430] initcall alsa_card_azx_init+0x0/0x20 returned 0 after 372964 usecs
[ 31.005810] calling alsa_card_korg1212_init+0x0/0x20 @ 1
[ 31.011225] bus: 'pci': add driver korg1212
config attached.
Today is the first time i saw this bug, so i guess the guilty commit is
one of:
8326e32: Merge branch 'topic/hda-resume-fix' into topic/hda
d4d9cd03: ALSA: hda - Add probe_only option
0ff5551: Merge branch 'fix/hda' into topic/hda
5c0b9be: ALSA: hda - Fix a compile warning when CONFIG_PM=n
32e176c: Sound: hda - Restore PCI configuration space with interrupts off
11cd41b: ALSA: hda - Fix build error with CONFIG_SND_HDA_POWER_SAVE
fee2fba: ALSA: hda - Move power_save option to hda_intel.c
986862b: ALSA: hda - make some functions static
ef1681d: ALSA: hda - Add probe_mask quirk for Medion MD96630
41dda0f: ALSA: azx_probe() cleanup
c4da29c: ALSA: hda - support detecting HD Audio devices with PCI class code
0edb945: ALSA: hda - Fix probe errors on Dell Studio Desktop
6ce4a3b: ALSA: hda - Make codec-probing more robust
33fa35e: ALSA: hda - simplify hda_bus ops callbacks
afecd78c: Merge branch 'topic/fix/hda' into topic/hda
34c2535: ALSA: hda - Remove old codec-probe limitation
176d533: ALSA: hda - Add infrastructure for dynamic stream allocation
Ingo
View attachment "config" of type "text/plain" (64553 bytes)
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