[pulseaudio-tickets] [Bug 89672] PulseAudio crashes when remote device is unpaired during A2DP streaming

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89672

--- Comment #3 from Rakesh M K <rakesh.mk at samsung.com> ---
In addition to the issue explained by Mr. Sagar, please find the root cause for
the issue.

//When remote headset is unpaired or disconnected, blueZ will call
"ClearConfiguration" Dbus method. Which will update the transport state to
disconnected.

16:19:35.027+0900   375   375 I PULSEAUDIO: [pulseaudio] bluez5-util.c: dbus:
path=/MediaEndpoint/A2DPSource, interface=org.bluez.MediaEndpoint1,
member=ClearConfiguration
16:19:35.027+0900   375   375 I PULSEAUDIO: [pulseaudio] bluez5-util.c:
Clearing transport /org/bluez/hci0/dev_00_18_09_24_68_25/fd0 profile a2dp_sink

//Due to which the STOP thread will be handled.
transport_state_changed_cb() -> pa_card_set_profile() -> set_profile_cb() ->
stop_thread().

//When Stop thread handling is in progress, rendering thread will post the
"BLUETOOTH_MESSAGE_IO_THREAD_FAILED" due to audio packet pa_write() fail.
thread_func() -> a2dp_process_render() -> goto fail; -> pa_asyncmsgq_post(with
IO thread fail).
16:19:35.032+0900   375   620 E PULSEAUDIO: [bluetooth] module-bluez5-device.c:
Failed to write data to socket: Broken pipe
16:19:35.032+0900   375   620 I PULSEAUDIO: [bluetooth] module-bluez5-device.c:
IO thread failed

//Since processing of message is done inside the stop_thread() which internally
calls the Stop_thread() one more time.
stop_thread() -> pa_thread_mq_done() -> pa_asyncmsgq_flush() ->
pa_asyncmsgq_dispatch() -> device_process_msg() for 
BLUETOOTH_MESSAGE_IO_THREAD_FAILED -> pa_card_set_profile() -> set_profile_cb()
-> stop_thread().

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