[alsa-devel] 3.18.0-rc1 pulseaudio possible recursive locking
Takashi Iwai
tiwai at suse.de
Tue Oct 21 07:27:34 CEST 2014
At Tue, 21 Oct 2014 00:30:59 +1030,
Arthur Marsh wrote:
>
> Hi, I have been seeing this a few times lately, and noticed that it was
> still present
>
> Is this the right place to report it or should I be reporting a bug
> against pulseaudio?
This is likely a false-positive report, so ignore it unless you really
encounter the deadlock by this.
Takashi
>
>
> [ 182.273991] =============================================
> [ 182.273996] [ INFO: possible recursive locking detected ]
> [ 182.274003] 3.18.0-rc1 #1297 Not tainted
> [ 182.274008] ---------------------------------------------
> [ 182.274013] pulseaudio/5183 is trying to acquire lock:
> [ 182.274018] (&(&substream->self_group.lock)->rlock/1){......}, at:
> [<f8432284>] snd_pcm_action_group+0x96/0x215 [snd_pcm]
> [ 182.274063]
> but task is already holding lock:
> [ 182.274069] (&(&substream->self_group.lock)->rlock/1){......}, at:
> [<f8432284>] snd_pcm_action_group+0x96/0x215 [snd_pcm]
> [ 182.274092]
> other info that might help us debug this:
> [ 182.274098] Possible unsafe locking scenario:
>
> [ 182.274104] CPU0
> [ 182.274108] ----
> [ 182.274112] lock(&(&substream->self_group.lock)->rlock/1);
> [ 182.274122] lock(&(&substream->self_group.lock)->rlock/1);
> [ 182.274132]
> *** DEADLOCK ***
>
> [ 182.274138] May be due to missing lock nesting notation
>
> [ 182.274146] 4 locks held by pulseaudio/5183:
> [ 182.274151] #0: (snd_pcm_link_rwlock){......}, at: [<f8432fe3>]
> snd_pcm_stream_lock+0x1b/0x43 [snd_pcm]
> [ 182.274177] #1: (&(&substream->self_group.lock)->rlock){......},
> at: [<f8432fee>] snd_pcm_stream_lock+0x26/0x43 [snd_pcm]
> [ 182.274202] #2: (&(&substream->group->lock)->rlock){......}, at:
> [<f8432cf4>] snd_pcm_action+0x34/0x10b [snd_pcm]
> [ 182.274227] #3: (&(&substream->self_group.lock)->rlock/1){......},
> at: [<f8432284>] snd_pcm_action_group+0x96/0x215 [snd_pcm]
> [ 182.274254]
> stack backtrace:
> [ 182.274263] CPU: 1 PID: 5183 Comm: pulseaudio Not tainted 3.18.0-rc1
> #1297
> [ 182.274269] Hardware name: System Manufacturer System Name/P4S800,
> BIOS ASUS P4S800 ACPI BIOS Revision 1011 Beta 001 08/30/2005
> [ 182.274275] c1bfc4e0 00000000 e55c9d50 c145d969 c1bfc4e0 e55c9dd4
> c1082b7b c15b7f9a
> [ 182.274295] e55b630c 0000143f 00000000 e55b6010 e55b6070 00000000
> 5402a095 00000004
> [ 182.274315] c17a4034 c1bfc4e0 e55b6508 e55b6520 00000000 00000008
> 00000000 e55b6508
> [ 182.274335] Call Trace:
> [ 182.274353] [<c145d969>] dump_stack+0x4b/0x75
> [ 182.274366] [<c1082b7b>] __lock_acquire+0x187c/0x19b3
> [ 182.274378] [<c10834ad>] lock_acquire+0xa1/0x126
> [ 182.274394] [<f8432284>] ? snd_pcm_action_group+0x96/0x215 [snd_pcm]
> [ 182.274404] [<c1463a9d>] _raw_spin_lock_nested+0x41/0x4e
> [ 182.274420] [<f8432284>] ? snd_pcm_action_group+0x96/0x215 [snd_pcm]
> [ 182.274436] [<f8432284>] snd_pcm_action_group+0x96/0x215 [snd_pcm]
> [ 182.274445] [<c146393b>] ? _raw_spin_trylock+0x6b/0x80
> [ 182.274462] [<f8432d0f>] snd_pcm_action+0x4f/0x10b [snd_pcm]
> [ 182.274479] [<f843332a>] snd_pcm_drop+0x4a/0x7d [snd_pcm]
> [ 182.274496] [<f84351d9>] snd_pcm_common_ioctl1+0x7b0/0xcc4 [snd_pcm]
> [ 182.274514] [<f84357ce>] snd_pcm_playback_ioctl1+0xe1/0x3a8 [snd_pcm]
> [ 182.274532] [<f8435ab7>] snd_pcm_playback_ioctl+0x22/0x35 [snd_pcm]
> [ 182.274549] [<f8435a95>] ? snd_pcm_playback_ioctl1+0x3a8/0x3a8 [snd_pcm]
> [ 182.274561] [<c1171e82>] do_vfs_ioctl+0x306/0x576
> [ 182.274573] [<c117d3ca>] ? mntput_no_expire+0x61/0x1e7
> [ 182.274583] [<c117d377>] ? mntput_no_expire+0xe/0x1e7
> [ 182.274594] [<c117d56b>] ? mntput+0x1b/0x29
> [ 182.274603] [<c1161438>] ? __fput+0x144/0x1aa
> [ 182.274614] [<c1172147>] SyS_ioctl+0x55/0x75
> [ 182.274624] [<c14646e0>] sysenter_do_call+0x12/0x12
>
> Regards,
>
> Arthur.
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