[Bug 1656] PulseAudioSourceDataLine.stop() hangs intermittently due to synchronization problem

[bugzilla-daemon at icedtea.classpath.org]

http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=1656

Chuck Ritola <cjritola at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |cjritola at gmail.com

--- Comment #1 from Chuck Ritola <cjritola at gmail.com> ---
I confirm this issue in openjdk-8-jdk 8u121-b13-0ubuntu1.16.04.2.

Getting intermittent hangs with my application, definitely looks like locks
being acquired in the wrong order by the icedtea pulseaudio implementation. Fix
requested. Thread dump below:


Found one Java-level deadlock:
=============================
"PulseAudio Eventloop Thread":
  waiting to lock monitor 0x00007fb0c4508538 (object 0x00000000e4640490, a
org.classpath.icedtea.pulseaudio.PulseAudioSourceDataLine),
  which is held by "main"
"main":
  waiting to lock monitor 0x00007fb0c45085e8 (object 0x00000000e3be4380, a
java.lang.Object),
  which is held by "PulseAudio Eventloop Thread"

Java stack information for the threads listed above:
===================================================
"PulseAudio Eventloop Thread":
at
org.classpath.icedtea.pulseaudio.PulseAudioDataLine$3.update(PulseAudioDataLine.java:215)
- waiting to lock <0x00000000e4640490> (a
org.classpath.icedtea.pulseaudio.PulseAudioSourceDataLine)
at
org.classpath.icedtea.pulseaudio.Stream.playbackStartedCallback(Stream.java:688)
- locked <0x00000000e4640658> (a java.util.LinkedList)
at org.classpath.icedtea.pulseaudio.EventLoop.native_iterate(Native Method)
at org.classpath.icedtea.pulseaudio.EventLoop.run(EventLoop.java:133)
- locked <0x00000000e3be4380> (a java.lang.Object)
at java.lang.Thread.run(Thread.java:745)


"main":
at
org.classpath.icedtea.pulseaudio.PulseAudioDataLine.stop(PulseAudioDataLine.java:386)
- waiting to lock <0x00000000e3be4380> (a java.lang.Object)
- locked <0x00000000e4640490> (a
org.classpath.icedtea.pulseaudio.PulseAudioSourceDataLine)
at
org.classpath.icedtea.pulseaudio.PulseAudioSourceDataLine.stop(PulseAudioSourceDataLine.java:51)
at
[the rest is application-specific]

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