[ INFO: possible recursive locking detected ] 3.10.0-0.rc0.git10.1.fc20.x86_64 #1 Not tainted --------------------------------------------- pulseaudio/1121 is trying to acquire lock: (&(&substream->self_group.lock)->rlock/1){......}, at: [<ffffffffa01195b3>] snd_pcm_action_group+0xa3/0x240 [snd_pcm] but task is already holding lock: (&(&substream->self_group.lock)->rlock/1){......}, at: [<ffffffffa01195b3>] snd_pcm_action_group+0xa3/0x240 [snd_pcm] other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&(&substream->self_group.lock)->rlock/1); lock(&(&substream->self_group.lock)->rlock/1); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by pulseaudio/1121: #0: (snd_pcm_link_rwlock){......}, at: [<ffffffffa011b307>] snd_pcm_drop+0x57/0xf0 [snd_pcm] #1: (&(&substream->self_group.lock)->rlock){......}, at: [<ffffffffa011b30f>] snd_pcm_drop+0x5f/0xf0 [snd_pcm] #2: (&(&substream->group->lock)->rlock){......}, at: [<ffffffffa011b131>] snd_pcm_action+0x31/0xa0 [snd_pcm] #3: (&(&substream->self_group.lock)->rlock/1){......}, at: [<ffffffffa01195b3>] snd_pcm_action_group+0xa3/0x240 [snd_pcm] stack backtrace: CPU: 0 PID: 1121 Comm: pulseaudio Not tainted 3.10.0-0.rc0.git10.1.fc20.x86_64 #1 Hardware name: Gigabyte Technology Co., Ltd. EP45-DS5/EP45-DS5, BIOS F12 09/30/2008 ffff8800a36626e0 ffff8800a7a1bbe0 ffffffff8171a781 ffff8800a7a1bca0 ffffffff810da13f 0000000000005d30 000000010000000c 0000000100000000 0002611300000000 4c2261933499c4ce ffffffff82214b00 ffff8800a36630b0 Call Trace: [<ffffffff8171a781>] dump_stack+0x19/0x1b [<ffffffff810da13f>] __lock_acquire+0x1a1f/0x1b30 [<ffffffff810d8a15>] ? __lock_acquire+0x2f5/0x1b30 [<ffffffff810daa42>] lock_acquire+0xa2/0x1f0 [<ffffffffa01195b3>] ? snd_pcm_action_group+0xa3/0x240 [snd_pcm] [<ffffffff81722084>] _raw_spin_lock_nested+0x44/0x80 [<ffffffffa01195b3>] ? snd_pcm_action_group+0xa3/0x240 [snd_pcm] [<ffffffffa01195b3>] snd_pcm_action_group+0xa3/0x240 [snd_pcm] [<ffffffffa011b164>] snd_pcm_action+0x64/0xa0 [snd_pcm] [<ffffffffa011b330>] snd_pcm_drop+0x80/0xf0 [snd_pcm] [<ffffffffa011cf28>] snd_pcm_common_ioctl1+0x8d8/0xc00 [snd_pcm] [<ffffffff812ebfdd>] ? avc_has_perm_flags+0x16d/0x350 [<ffffffff812ebe99>] ? avc_has_perm_flags+0x29/0x350 [<ffffffffa011d3e3>] snd_pcm_playback_ioctl1+0x193/0x2c0 [snd_pcm] [<ffffffffa011d540>] snd_pcm_playback_ioctl+0x30/0x40 [snd_pcm] [<ffffffff811ef485>] do_vfs_ioctl+0x305/0x530 [<ffffffff812ee96b>] ? selinux_file_ioctl+0x5b/0x110 [<ffffffff811ef731>] SyS_ioctl+0x81/0xa0 [<ffffffff8172bf99>] system_call_fastpath+0x16/0x1b
*** Bug 961777 has been marked as a duplicate of this bug. ***
*** This bug has been marked as a duplicate of bug 951862 ***