For what it's worth, here's a backtrace of when it's hung trying to 
connect to pulse...

#0  pthread_cond_wait@@GLIBC_2.3.2 () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007ffff125e42b in pa_threaded_mainloop_wait () from 
/usr/lib/libpulse.so.0
#2  0x00007ffff5af12a9 in pulse_open (device=0xc5a2c40, 
device_name=0x7ffff5af6cf0 "PulseAudio Software")
    at 
/usr/local/builds/flightgear/openal-soft-1.10.622/Alc/pulseaudio.c:391
#3  0x00007ffff5af2153 in pulse_open_playback (device=0xc5a2c40,
    device_name=0x7ffff5af6cf0 "PulseAudio Software")
    at 
/usr/local/builds/flightgear/openal-soft-1.10.622/Alc/pulseaudio.c:452
#4  0x00007ffff5ad9200 in alcOpenDevice (deviceName=0x0)
    at /usr/local/builds/flightgear/openal-soft-1.10.622/Alc/ALc.c:1587
#5  0x000000000099b271 in SGSoundMgr::init (this=0xf21e00)
    at ../../../SimGear/simgear/sound/soundmgr_openal.cxx:104
#6  0x000000000044b27f in fgInitSubsystems () at 
../../../FlightGear/src/Main/fg_init.cxx:1460
#7  0x000000000042c68d in fgIdleFunction () at 
../../../FlightGear/src/Main/main.cxx:750
#8  0x0000000000482232 in fgOSMainLoop () at 
../../../FlightGear/src/Main/fg_os_osgviewer.cxx:172
#9  0x000000000042be8f in fgMainInit (argc=3, argv=0x7fffffffe878) at 
../../../FlightGear/src/Main/main.cxx:896
#10 0x000000000042a079 in main (argc=3, argv=0x7fffffffe878) at 
../../../FlightGear/src/Main/bootstrap.cxx:229


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