syslog:

Oct  5 15:48:53 fxa kernel: [  199.766955]
Oct  5 15:48:53 fxa kernel: [  199.766959] =============================================
Oct  5 15:48:53 fxa kernel: [  199.766961] [ INFO: possible recursive locking detected ]
Oct  5 15:48:53 fxa kernel: [  199.766963] 3.10.13-fxa #1 Not tainted
Oct  5 15:48:53 fxa kernel: [  199.766964] ---------------------------------------------
Oct  5 15:48:53 fxa kernel: [  199.766966] pulseaudio/5108 is trying to acquire lock:
Oct  5 15:48:53 fxa kernel: [  199.766967]  (&(&substream->self_group.lock)->rlock/1){......}, at: [<ffffffffa02a
d57a>] snd_pcm_action_group+0x64/0x1cd [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.766978]
Oct  5 15:48:53 fxa kernel: [  199.766978] but task is already holding lock:
Oct  5 15:48:53 fxa kernel: [  199.766980]  (&(&substream->self_group.lock)->rlock/1){......}, at: [<ffffffffa02a
d57a>] snd_pcm_action_group+0x64/0x1cd [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.766986]
Oct  5 15:48:53 fxa kernel: [  199.766986] other info that might help us debug this:
Oct  5 15:48:53 fxa kernel: [  199.766988]  Possible unsafe locking scenario:
Oct  5 15:48:53 fxa kernel: [  199.766988]
Oct  5 15:48:53 fxa kernel: [  199.766989]        CPU0
Oct  5 15:48:53 fxa kernel: [  199.766990]        ----
Oct  5 15:48:53 fxa kernel: [  199.766991]   lock(&(&substream->self_group.lock)->rlock/1);
Oct  5 15:48:53 fxa kernel: [  199.766993]   lock(&(&substream->self_group.lock)->rlock/1);
Oct  5 15:48:53 fxa kernel: [  199.766994]
Oct  5 15:48:53 fxa kernel: [  199.766994]  *** DEADLOCK ***
Oct  5 15:48:53 fxa kernel: [  199.766994]
Oct  5 15:48:53 fxa kernel: [  199.766996]  May be due to missing lock nesting notation
Oct  5 15:48:53 fxa kernel: [  199.766996]
Oct  5 15:48:53 fxa kernel: [  199.766998] 4 locks held by pulseaudio/5108:
Oct  5 15:48:53 fxa kernel: [  199.766998]  #0:  (snd_pcm_link_rwlock){......}, at: [<ffffffffa02acf46>] snd_pcm_
stream_lock_irq+0x14/0x23 [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767004]  #1:  (&(&substream->self_group.lock)->rlock){......}, at: [<ffffffffa
02acf52>] snd_pcm_stream_lock_irq+0x20/0x23 [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767009]  #2:  (&(&substream->group->lock)->rlock){......}, at: [<ffffffffa02ae
386>] snd_pcm_action+0x2b/0x85 [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767015]  #3:  (&(&substream->self_group.lock)->rlock/1){......}, at: [<fffffff
fa02ad57a>] snd_pcm_action_group+0x64/0x1cd [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767021]
Oct  5 15:48:53 fxa kernel: [  199.767021] stack backtrace:
Oct  5 15:48:53 fxa kernel: [  199.767023] CPU: 3 PID: 5108 Comm: pulseaudio Not tainted 3.10.13-fxa #1
Oct  5 15:48:53 fxa kernel: [  199.767024] Hardware name: Gigabyte Technology Co., Ltd. GA-990FXA-UD3/GA-990FXA-U
D3, BIOS F5 10/13/2011
Oct  5 15:48:53 fxa kernel: [  199.767026]  0000000000000000 ffff88041a27dc00 ffffffff81360159 ffff88041a27dca8
Oct  5 15:48:53 fxa kernel: [  199.767029]  ffffffff810789f6 ffff880400000001 ffff880400000000 ffffffff81c2b720
Oct  5 15:48:53 fxa kernel: [  199.767032]  0000000000000002 49724c12809424a1 ffff88041a248788 ffff88041a27dcf0
Oct  5 15:48:53 fxa kernel: [  199.767034] Call Trace:
Oct  5 15:48:53 fxa kernel: [  199.767039]  [<ffffffff81360159>] dump_stack+0x19/0x1b
Oct  5 15:48:53 fxa kernel: [  199.767043]  [<ffffffff810789f6>] __lock_acquire+0xbff/0xd92
Oct  5 15:48:53 fxa kernel: [  199.767045]  [<ffffffff8107817e>] ? __lock_acquire+0x387/0xd92
Oct  5 15:48:53 fxa kernel: [  199.767047]  [<ffffffff810783dd>] ? __lock_acquire+0x5e6/0xd92
Oct  5 15:48:53 fxa kernel: [  199.767049]  [<ffffffff81078ea6>] lock_acquire+0xa3/0x11a
Oct  5 15:48:53 fxa kernel: [  199.767054]  [<ffffffffa02ad57a>] ? snd_pcm_action_group+0x64/0x1cd [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767057]  [<ffffffff813636b5>] _raw_spin_lock_nested+0x36/0x42
Oct  5 15:48:53 fxa kernel: [  199.767062]  [<ffffffffa02ad57a>] ? snd_pcm_action_group+0x64/0x1cd [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767066]  [<ffffffffa02ad57a>] snd_pcm_action_group+0x64/0x1cd [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767071]  [<ffffffffa02ae3bc>] snd_pcm_action+0x61/0x85 [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767075]  [<ffffffffa02ae3f5>] snd_pcm_stop+0x15/0x17 [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767080]  [<ffffffffa02af1c4>] snd_pcm_drop+0x69/0x7f [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767084]  [<ffffffffa02b08a8>] snd_pcm_common_ioctl1+0x87e/0xad1 [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767086]  [<ffffffff8107817e>] ? __lock_acquire+0x387/0xd92
Oct  5 15:48:53 fxa kernel: [  199.767091]  [<ffffffffa02b0d0e>] snd_pcm_playback_ioctl1+0x213/0x230 [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767096]  [<ffffffffa02b0d55>] snd_pcm_playback_ioctl+0x2a/0x2e [snd_pcm]
Oct  5 15:48:53 fxa kernel: [  199.767099]  [<ffffffff81118465>] vfs_ioctl+0x18/0x34
Oct  5 15:48:53 fxa kernel: [  199.767101]  [<ffffffff81118cb2>] do_vfs_ioctl+0x38d/0x44b
Oct  5 15:48:53 fxa kernel: [  199.767104]  [<ffffffff81120777>] ? rcu_read_unlock+0x1c/0x2d
Oct  5 15:48:53 fxa kernel: [  199.767107]  [<ffffffff81118dc2>] SyS_ioctl+0x52/0x7d
Oct  5 15:48:53 fxa kernel: [  199.767109]  [<ffffffff8111b92a>] ? dput+0x3f/0x114
Oct  5 15:48:53 fxa kernel: [  199.767112]  [<ffffffff813695d6>] system_call_fastpath+0x1a/0x1f
Oct  5 15:48:53 fxa pulseaudio[5108]: [pulseaudio] sink.c: Default and alternate sample rates are the same.