#0  0x00007f31507fe56c in __lll_lock_wait () from /lib/libpthread.so.0
#1  0x00007f31507f9f80 in _L_lock_530 () from /lib/libpthread.so.0
#2  0x00007f31507f9e19 in pthread_mutex_lock () from /lib/libpthread.so.0
#3  0x00007f3150a61b8e in SDL_mutexP () from /usr/lib/libSDL-1.2.so.0
#4  0x000000000133111c in SdlMutexManager::lockMutex (this=0x2c758d0, mutex=0x2c79270) at ../git/backends/mutex/sdl/sdl-mutex.cpp:36
#5  0x000000000131be6c in ModularBackend::lockMutex (this=0x2c69630, mutex=0x2c79270) at ../git/backends/modular-backend.cpp:213
#6  0x000000000144266f in Common::StackLock::lock (this=0x7f314779fb50) at ../git/common/mutex.cpp:68
#7  0x00000000014425f2 in Common::StackLock::StackLock (this=0x7f314779fb50, mutex=..., mutexName=0x0) at ../git/common/mutex.cpp:57
#8  0x000000000064672c in AGOS::MidiPlayer::onTimer (data=0x2c7af80) at ../git/engines/agos/midi.cpp:192
#9  0x000000000051be25 in MidiDriver_Emulated::readBuffer (this=0x349d150, data=0x7f3134005860, numSamples=2048)
    at ../git/audio/softsynth/emumidi.h:105
#10 0x00000000014150b1 in Audio::CopyRateConverter<false, false>::flow (this=0x2d51930, input=..., obuf=0x2dd7c30, osamp=2048, vol_l=256, 
    vol_r=256) at ../git/audio/rate.cpp:305
#11 0x00000000013d6729 in Audio::Channel::mix (this=0x2d824e0, data=0x2dd7c30, len=2048) at ../git/audio/mixer.cpp:610
#12 0x00000000013d51e3 in Audio::MixerImpl::mixCallback (this=0x2c67300, samples=0x2dd7c30 "", len=2048) at ../git/audio/mixer.cpp:291
#13 0x000000000133100f in SdlMixerManager::callbackHandler (this=0x2dafe60, samples=0x2dd7c30 "", len=8192)
    at ../git/backends/mixer/sdl/sdl-mixer.cpp:138
#14 0x000000000133106f in SdlMixerManager::sdlCallback (this_=0x2dafe60, samples=0x2dd7c30 "", len=8192)
    at ../git/backends/mixer/sdl/sdl-mixer.cpp:145
#15 0x00007f3150a159f8 in ?? () from /usr/lib/libSDL-1.2.so.0
#16 0x00007f3150a1de15 in ?? () from /usr/lib/libSDL-1.2.so.0
#17 0x00007f3150a61739 in ?? () from /usr/lib/libSDL-1.2.so.0
#18 0x00007f314ee9a2da in ?? () from /usr/lib/libGL.so.1
#19 0x00007f31507f7e7a in start_thread () from /lib/libpthread.so.0
#20 0x00007f314e325bad in clone () from /lib/libc.so.6
#21 0x0000000000000000 in ?? ()