From: Daniel Mack <daniel@caiaq.de>
To: alsa-devel@alsa-project.org
Subject: aplay: possible circular locking dependency detected
Date: Sun, 21 Feb 2010 14:31:51 +0100 [thread overview]
Message-ID: <20100221133151.GA28396@buzzloop.caiaq.de> (raw)
I got this once while testing an USB audio device. Appeareantly not reproducable.
Daniel
Feb 21 14:26:29 jup kernel: [69661.385427]
Feb 21 14:26:29 jup kernel: [69661.385430] =======================================================
Feb 21 14:26:29 jup kernel: [69661.385435] [ INFO: possible circular locking dependency detected ]
Feb 21 14:26:29 jup kernel: [69661.385439] 2.6.33-rc8 #21
Feb 21 14:26:29 jup kernel: [69661.385441] -------------------------------------------------------
Feb 21 14:26:29 jup kernel: [69661.385444] aplay/11761 is trying to acquire lock:
Feb 21 14:26:29 jup kernel: [69661.385446] (sysfs_mutex){+.+.+.}, at: [<c10f0668>] sysfs_get_dirent+0x15/0x4c
Feb 21 14:26:29 jup kernel: [69661.385457]
Feb 21 14:26:29 jup kernel: [69661.385457] but task is already holding lock:
Feb 21 14:26:29 jup kernel: [69661.385460] (&pcm->open_mutex){+.+.+.}, at: [<fb68bc8e>] snd_pcm_release+0x55/0x9e [snd_pcm]
Feb 21 14:26:29 jup kernel: [69661.385474]
Feb 21 14:26:29 jup kernel: [69661.385474] which lock already depends on the new lock.
Feb 21 14:26:29 jup kernel: [69661.385476]
Feb 21 14:26:29 jup kernel: [69661.385478]
Feb 21 14:26:29 jup kernel: [69661.385479] the existing dependency chain (in reverse order) is:
Feb 21 14:26:29 jup kernel: [69661.385481]
Feb 21 14:26:29 jup kernel: [69661.385482] -> #2 (&pcm->open_mutex){+.+.+.}:
Feb 21 14:26:29 jup kernel: [69661.385487] [<c1059070>] __lock_acquire+0x10ff/0x1422
Feb 21 14:26:29 jup kernel: [69661.385493] [<c105943b>] lock_acquire+0xa8/0xbf
Feb 21 14:26:29 jup kernel: [69661.385498] [<c13720d3>] mutex_lock_nested+0x47/0x2b2
Feb 21 14:26:29 jup kernel: [69661.385503] [<fb68bc8e>] snd_pcm_release+0x55/0x9e [snd_pcm]
Feb 21 14:26:29 jup kernel: [69661.385513] [<c10aabe9>] __fput+0xeb/0x196
Feb 21 14:26:29 jup kernel: [69661.385517] [<c10aacad>] fput+0x19/0x1b
Feb 21 14:26:29 jup kernel: [69661.385522] [<c109ae3b>] remove_vma+0x39/0x58
Feb 21 14:26:29 jup kernel: [69661.385528] [<c109bab3>] do_munmap+0x23c/0x259
Feb 21 14:26:29 jup kernel: [69661.385532] [<c109bb00>] sys_munmap+0x30/0x3f
Feb 21 14:26:29 jup kernel: [69661.385536] [<c10028d0>] sysenter_do_call+0x12/0x36
Feb 21 14:26:29 jup kernel: [69661.385541]
Feb 21 14:26:29 jup kernel: [69661.385542] -> #1 (&mm->mmap_sem){++++++}:
Feb 21 14:26:29 jup kernel: [69661.385547] [<c1059070>] __lock_acquire+0x10ff/0x1422
Feb 21 14:26:29 jup kernel: [69661.385551] [<c105943b>] lock_acquire+0xa8/0xbf
Feb 21 14:26:29 jup kernel: [69661.385556] [<c10968db>] might_fault+0x6b/0x88
Feb 21 14:26:29 jup kernel: [69661.385561] [<c11b3cf0>] copy_to_user+0x2c/0xfc
Feb 21 14:26:29 jup kernel: [69661.385565] [<c10b5e73>] filldir64+0x97/0xcd
Feb 21 14:26:29 jup kernel: [69661.385570] [<c10f0534>] sysfs_readdir+0x117/0x14b
Feb 21 14:26:29 jup kernel: [69661.385574] [<c10b6085>] vfs_readdir+0x68/0x94
Feb 21 14:26:29 jup kernel: [69661.385578] [<c10b6114>] sys_getdents64+0x63/0xa0
Feb 21 14:26:29 jup kernel: [69661.385582] [<c10028d0>] sysenter_do_call+0x12/0x36
Feb 21 14:26:29 jup kernel: [69661.385587]
Feb 21 14:26:29 jup kernel: [69661.385587] -> #0 (sysfs_mutex){+.+.+.}:
Feb 21 14:26:29 jup kernel: [69661.385592] [<c1058dc6>] __lock_acquire+0xe55/0x1422
Feb 21 14:26:29 jup kernel: [69661.385597] [<c105943b>] lock_acquire+0xa8/0xbf
Feb 21 14:26:29 jup kernel: [69661.385601] [<c13720d3>] mutex_lock_nested+0x47/0x2b2
Feb 21 14:26:29 jup kernel: [69661.385605] [<c10f0668>] sysfs_get_dirent+0x15/0x4c
Feb 21 14:26:29 jup kernel: [69661.385609] [<c10f1b4a>] sysfs_remove_group+0x1e/0xa3
Feb 21 14:26:29 jup kernel: [69661.385614] [<c12359b8>] dpm_sysfs_remove+0x10/0x12
Feb 21 14:26:29 jup kernel: [69661.385619] [<c123114c>] device_del+0x33/0x154
Feb 21 14:26:29 jup kernel: [69661.385625] [<c1231278>] device_unregister+0xb/0x15
Feb 21 14:26:29 jup kernel: [69661.385629] [<c129a209>] usb_remove_ep_devs+0x15/0x1f
Feb 21 14:26:29 jup kernel: [69661.385635] [<c12943ff>] remove_intf_ep_devs+0x21/0x32
Feb 21 14:26:29 jup kernel: [69661.385640] [<c12954ea>] usb_set_interface+0x18c/0x22c
Feb 21 14:26:29 jup kernel: [69661.385644] [<fc703cd7>] snd_usb_playback_close+0x20/0x33 [snd_usb_audio]
Feb 21 14:26:29 jup kernel: [69661.385654] [<fb68bc10>] snd_pcm_release_substream+0x3d/0x66 [snd_pcm]
Feb 21 14:26:29 jup kernel: [69661.385664] [<fb68bc95>] snd_pcm_release+0x5c/0x9e [snd_pcm]
Feb 21 14:26:29 jup kernel: [69661.385673] [<c10aabe9>] __fput+0xeb/0x196
Feb 21 14:26:29 jup kernel: [69661.385677] [<c10aacad>] fput+0x19/0x1b
Feb 21 14:26:29 jup kernel: [69661.385681] [<c109ae3b>] remove_vma+0x39/0x58
Feb 21 14:26:29 jup kernel: [69661.385685] [<c109bab3>] do_munmap+0x23c/0x259
Feb 21 14:26:29 jup kernel: [69661.385689] [<c109bb00>] sys_munmap+0x30/0x3f
Feb 21 14:26:29 jup kernel: [69661.385693] [<c10028d0>] sysenter_do_call+0x12/0x36
Feb 21 14:26:29 jup kernel: [69661.385698]
Feb 21 14:26:29 jup kernel: [69661.385698] other info that might help us debug this:
Feb 21 14:26:29 jup kernel: [69661.385700]
Feb 21 14:26:29 jup kernel: [69661.385702] 2 locks held by aplay/11761:
Feb 21 14:26:29 jup kernel: [69661.385705] #0: (&mm->mmap_sem){++++++}, at: [<c109baf3>] sys_munmap+0x23/0x3f
Feb 21 14:26:29 jup kernel: [69661.385711] #1: (&pcm->open_mutex){+.+.+.}, at: [<fb68bc8e>] snd_pcm_release+0x55/0x9e [snd_pcm]
Feb 21 14:26:29 jup kernel: [69661.385723]
Feb 21 14:26:29 jup kernel: [69661.385724] stack backtrace:
Feb 21 14:26:29 jup kernel: [69661.385727] Pid: 11761, comm: aplay Not tainted 2.6.33-rc8 #21
Feb 21 14:26:29 jup kernel: [69661.385730] Call Trace:
Feb 21 14:26:29 jup kernel: [69661.385735] [<c137062c>] ? printk+0xf/0x11
Feb 21 14:26:29 jup kernel: [69661.385740] [<c1057b26>] print_circular_bug+0x90/0x9c
Feb 21 14:26:29 jup kernel: [69661.385744] [<c1058dc6>] __lock_acquire+0xe55/0x1422
Feb 21 14:26:29 jup kernel: [69661.385748] [<c105917f>] ? __lock_acquire+0x120e/0x1422
Feb 21 14:26:29 jup kernel: [69661.385753] [<c103d4d3>] ? try_to_del_timer_sync+0x9c/0xa4
Feb 21 14:26:29 jup kernel: [69661.385758] [<c105943b>] lock_acquire+0xa8/0xbf
Feb 21 14:26:29 jup kernel: [69661.385762] [<c10f0668>] ? sysfs_get_dirent+0x15/0x4c
Feb 21 14:26:29 jup kernel: [69661.385766] [<c10f0668>] ? sysfs_get_dirent+0x15/0x4c
Feb 21 14:26:29 jup kernel: [69661.385769] [<c13720d3>] mutex_lock_nested+0x47/0x2b2
Feb 21 14:26:29 jup kernel: [69661.385773] [<c10f0668>] ? sysfs_get_dirent+0x15/0x4c
Feb 21 14:26:29 jup kernel: [69661.385777] [<c137187f>] ? __mutex_unlock_slowpath+0xe9/0x105
Feb 21 14:26:29 jup kernel: [69661.385781] [<c10572e5>] ? trace_hardirqs_on_caller+0xff/0x120
Feb 21 14:26:29 jup kernel: [69661.385785] [<c10f0668>] sysfs_get_dirent+0x15/0x4c
Feb 21 14:26:29 jup kernel: [69661.385789] [<c10f1b4a>] sysfs_remove_group+0x1e/0xa3
Feb 21 14:26:29 jup kernel: [69661.385793] [<c12359b8>] dpm_sysfs_remove+0x10/0x12
Feb 21 14:26:29 jup kernel: [69661.385797] [<c123114c>] device_del+0x33/0x154
Feb 21 14:26:29 jup kernel: [69661.385801] [<c1231278>] device_unregister+0xb/0x15
Feb 21 14:26:29 jup kernel: [69661.385805] [<c129a209>] usb_remove_ep_devs+0x15/0x1f
Feb 21 14:26:29 jup kernel: [69661.385809] [<c12943ff>] remove_intf_ep_devs+0x21/0x32
Feb 21 14:26:29 jup kernel: [69661.385813] [<c12954ea>] usb_set_interface+0x18c/0x22c
Feb 21 14:26:29 jup kernel: [69661.385822] [<fc703cd7>] snd_usb_playback_close+0x20/0x33 [snd_usb_audio]
Feb 21 14:26:29 jup kernel: [69661.385830] [<fb68bc10>] snd_pcm_release_substream+0x3d/0x66 [snd_pcm]
Feb 21 14:26:29 jup kernel: [69661.385839] [<fb68bc95>] snd_pcm_release+0x5c/0x9e [snd_pcm]
Feb 21 14:26:29 jup kernel: [69661.385843] [<c10aabe9>] __fput+0xeb/0x196
Feb 21 14:26:29 jup kernel: [69661.385847] [<c10aacad>] fput+0x19/0x1b
Feb 21 14:26:29 jup kernel: [69661.385851] [<c109ae3b>] remove_vma+0x39/0x58
Feb 21 14:26:29 jup kernel: [69661.385854] [<c109bab3>] do_munmap+0x23c/0x259
Feb 21 14:26:29 jup kernel: [69661.385858] [<c109bb00>] sys_munmap+0x30/0x3f
Feb 21 14:26:29 jup kernel: [69661.385862] [<c10028d0>] sysenter_do_call+0x12/0x36
next reply other threads:[~2010-02-21 13:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-21 13:31 Daniel Mack [this message]
2010-02-25 15:48 ` aplay: possible circular locking dependency detected Daniel Mack
2010-02-25 19:52 ` Takashi Iwai
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20100221133151.GA28396@buzzloop.caiaq.de \
--to=daniel@caiaq.de \
--cc=alsa-devel@alsa-project.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.