diff options
authorBartosz Golaszewski <>2017-07-05 12:45:00 +0200
committerBartosz Golaszewski <>2017-07-06 12:59:00 +0000
commit53538ff9492c5889db3bcbbbe17bc270d1e83cb1 (patch)
parent2b343affb7b16ff195bbc8139d2873b183292852 (diff)
PulseAudio: fix a pthread_mutex crash in error path
QSoundEffect (pulseaudio) uses a workaround for stability issues: although the pulseaudio mainloop mutex is recursive, it utilizes a separate lock counting. This is not the best solution, but it is a part of a larger set of changes which improved the stability in CI under heavy load. QSoundEffect always calls pa_threaded_mainloop_lock/unlock() from the same thread so the additional lock counting works in normal situation even though it doesn't use atomic types. However if pa_context_connect() fails, pa_threaded_mainloop_unlock() is called without regard to current lock count. This leads to random double-unlock aborts if pa_context_connect() fails more than once (e.g. after the reconnect scheduled from onContextFailed()). Fix this by always using the PulseDaemon wrappers around pa_threaded_mainloop_lock/unlock(). Task-number: QTBUG-61725 Change-Id: I41eb9a76892a6646fd5620ef8f686473b339464f Reviewed-by: Christian Stromme <>
1 files changed, 2 insertions, 2 deletions
diff --git a/src/multimedia/audio/qsoundeffect_pulse_p.cpp b/src/multimedia/audio/qsoundeffect_pulse_p.cpp
index 3a3806155..1e9204598 100644
--- a/src/multimedia/audio/qsoundeffect_pulse_p.cpp
+++ b/src/multimedia/audio/qsoundeffect_pulse_p.cpp
@@ -181,7 +181,7 @@ private Q_SLOTS:
if (m_context == 0) {
qWarning("PulseAudioService: Unable to create new pulseaudio context");
- pa_threaded_mainloop_unlock(m_mainLoop);
+ unlock();
m_mainLoop = 0;
@@ -193,7 +193,7 @@ private Q_SLOTS:
if (pa_context_connect(m_context, 0, (pa_context_flags_t)0, 0) < 0) {
qWarning("PulseAudioService: pa_context_connect() failed");
- pa_threaded_mainloop_unlock(m_mainLoop);
+ unlock();
m_mainLoop = 0;
m_context = 0;