From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jiri Slaby Subject: Sound+USB: deadlock problem Date: Tue, 13 Nov 2012 09:26:17 +0100 Message-ID: <50A20429.3020109@suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Takashi Iwai , Jaroslav Kysela Cc: alsa-devel@alsa-project.org, LKML , USB list , Jiri Slaby List-Id: alsa-devel@alsa-project.org Hello, I've just plugged+unplugged+plugged my USB audio card and the audio subsystem got stuck: INFO: task khubd:440 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. khubd D ffff8801cbc92400 0 440 2 0x00000000 ffff8801c4ae3a38 0000000000000046 ffff8801c49be270 ffff8801c4ae3fd8 ffff8801c4ae3fd8 ffff8801c4ae3fd8 ffff8801c4284830 ffff8801c49be270 ffff8801c4ae3a28 ffff8801a7198758 ffff8801a719875c ffff8801c49be270 Call Trace: [] schedule+0x29/0x70 [] schedule_preempt_disabled+0xe/0x10 [] __mutex_lock_slowpath+0xca/0x140 [] mutex_lock+0x2a/0x50 [] snd_pcm_dev_disconnect+0x46/0x1f0 [] snd_device_disconnect+0x62/0xa0 [] snd_device_disconnect_all+0x44/0x70 [] snd_card_disconnect+0x153/0x1d0 [] ? down_write+0x38/0x40 [] usb_audio_disconnect+0x88/0x1c0 [] usb_unbind_interface+0x60/0x1a0 [] __device_release_driver+0x7c/0xe0 [] device_release_driver+0x2c/0x40 [] bus_remove_device+0xee/0x160 [] device_del+0x11a/0x1b0 [] usb_disable_device+0xb0/0x270 [] usb_disconnect+0xad/0x160 [] hub_thread+0x6fe/0x1700 [] ? dequeue_task_fair+0xee/0x100 [] ? finish_wait+0x80/0x80 [] ? usb_remote_wakeup+0x70/0x70 [] kthread+0xc0/0xd0 [] ? kthread_create_on_node+0x130/0x130 [] ret_from_fork+0x7c/0xb0 [] ? kthread_create_on_node+0x130/0x130 INFO: task pulseaudio:4642 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. pulseaudio D ffff8801cbc12400 0 4642 1 0x00000000 ffff8801c1c39cf0 0000000000000082 ffff8801c0d7d550 ffff8801c1c39fd8 ffff8801c1c39fd8 ffff8801c1c39fd8 ffff8801a7203480 ffff8801c0d7d550 ffff8801aa37b530 ffff8801c0d7d550 ffff8800ab118a48 fffffffeffffffff Call Trace: [] schedule+0x29/0x70 [] rwsem_down_failed_common+0xbd/0x150 [] rwsem_down_read_failed+0x15/0x17 [] call_rwsem_down_read_failed+0x14/0x30 [] ? down_read+0x24/0x2b [] snd_usb_hw_free+0x42/0x90 [] snd_pcm_release_substream+0x5b/0xc0 [] snd_pcm_release+0x48/0xb0 [] snd_disconnect_release+0x97/0xe0 [] __fput+0xec/0x230 [] ____fput+0xe/0x10 [] task_work_run+0xa7/0xe0 [] do_notify_resume+0x59/0x80 [] int_signal+0x12/0x17 INFO: task khubd:440 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. khubd D ffff8801cbc92400 0 440 2 0x00000000 ffff8801c4ae3a38 0000000000000046 ffff8801c49be270 ffff8801c4ae3fd8 ffff8801c4ae3fd8 ffff8801c4ae3fd8 ffff8801c4284830 ffff8801c49be270 ffff8801c4ae3a28 ffff8801a7198758 ffff8801a719875c ffff8801c49be270 Call Trace: [] schedule+0x29/0x70 [] schedule_preempt_disabled+0xe/0x10 [] __mutex_lock_slowpath+0xca/0x140 [] mutex_lock+0x2a/0x50 [] snd_pcm_dev_disconnect+0x46/0x1f0 [] snd_device_disconnect+0x62/0xa0 [] snd_device_disconnect_all+0x44/0x70 [] snd_card_disconnect+0x153/0x1d0 [] ? down_write+0x38/0x40 [] usb_audio_disconnect+0x88/0x1c0 [] usb_unbind_interface+0x60/0x1a0 [] __device_release_driver+0x7c/0xe0 [] device_release_driver+0x2c/0x40 [] bus_remove_device+0xee/0x160 [] device_del+0x11a/0x1b0 [] usb_disable_device+0xb0/0x270 [] usb_disconnect+0xad/0x160 [] hub_thread+0x6fe/0x1700 [] ? dequeue_task_fair+0xee/0x100 [] ? finish_wait+0x80/0x80 [] ? usb_remote_wakeup+0x70/0x70 [] kthread+0xc0/0xd0 [] ? kthread_create_on_node+0x130/0x130 [] ret_from_fork+0x7c/0xb0 [] ? kthread_create_on_node+0x130/0x130 sadc D ffff8801cbc92400 0 7883 7870 0x00000004 ffff8801b9ab5d98 0000000000000082 ffff8801087b0d20 ffff8801b9ab5fd8 ffff8801b9ab5fd8 ffff8801b9ab5fd8 ffff8801c487c830 ffff8801087b0d20 ffff8801c0ca5380 ffff8801b99b08e8 ffff8801b99b08ec ffff8801087b0d20 Call Trace: [] schedule+0x29/0x70 [] schedule_preempt_disabled+0xe/0x10 [] __mutex_lock_slowpath+0xca/0x140 [] mutex_lock+0x2a/0x50 [] show_manufacturer+0x2b/0x60 [] dev_attr_show+0x20/0x60 [] ? __get_free_pages+0x17/0x50 [] sysfs_read_file+0xa5/0x1c0 [] vfs_read+0xa9/0x180 [] sys_read+0x52/0xa0 [] system_call_fastpath+0x16/0x1b thanks, -- js suse labs