. Thread 12 (process 9554): #0 0x00007f58cf4ea2e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0 #1 0x00007f58cf768939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4 #2 0x000000000053c50b in MixerWorkerThread::run () #3 0x00007f58cf767952 in ?? () from /usr/lib/libQtCore.so.4 #4 0x00007f58cf4e63ba in start_thread () from /lib/libpthread.so.0 #5 0x00007f58cd03cfcd in clone () from /lib/libc.so.6 #6 0x0000000000000000 in ?? () . Thread 11 (process 9557): #0 0x00007f58cf4ea2e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0 #1 0x00007f58cf768939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4 #2 0x000000000053c50b in MixerWorkerThread::run () #3 0x00007f58cf767952 in ?? () from /usr/lib/libQtCore.so.4 #4 0x00007f58cf4e63ba in start_thread () from /lib/libpthread.so.0 #5 0x00007f58cd03cfcd in clone () from /lib/libc.so.6 #6 0x0000000000000000 in ?? () . Thread 10 (process 9553): #0 0x00007f58cf4ea2e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0 #1 0x00007f58cf768939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4 #2 0x000000000053c50b in MixerWorkerThread::run () #3 0x00007f58cf767952 in ?? () from /usr/lib/libQtCore.so.4 #4 0x00007f58cf4e63ba in start_thread () from /lib/libpthread.so.0 #5 0x00007f58cd03cfcd in clone () from /lib/libc.so.6 #6 0x0000000000000000 in ?? () . Thread 9 (process 9558): #0 0x00007f58cf4ea2e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0 #1 0x00007f58cf768939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4 #2 0x000000000053c50b in MixerWorkerThread::run () #3 0x00007f58cf767952 in ?? () from /usr/lib/libQtCore.so.4 #4 0x00007f58cf4e63ba in start_thread () from /lib/libpthread.so.0 #5 0x00007f58cd03cfcd in clone () from /lib/libc.so.6 #6 0x0000000000000000 in ?? () . Thread 8 (process 9552): #0 0x00007f58cf4ea2e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0 #1 0x00007f58cf768939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4 #2 0x000000000053c50b in MixerWorkerThread::run () #3 0x00007f58cf767952 in ?? () from /usr/lib/libQtCore.so.4 #4 0x00007f58cf4e63ba in start_thread () from /lib/libpthread.so.0 #5 0x00007f58cd03cfcd in clone () from /lib/libc.so.6 #6 0x0000000000000000 in ?? () . Thread 7 (process 9556): #0 0x00007f58cf4ea2e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0 #1 0x00007f58cf768939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4 #2 0x000000000053c50b in MixerWorkerThread::run () #3 0x00007f58cf767952 in ?? () from /usr/lib/libQtCore.so.4 #4 0x00007f58cf4e63ba in start_thread () from /lib/libpthread.so.0 #5 0x00007f58cd03cfcd in clone () from /lib/libc.so.6 #6 0x0000000000000000 in ?? () . Thread 6 (process 9560): #0 0x00007f58cd033496 in poll () from /lib/libc.so.6 #1 0x000000000051316a in midiALSASeq::run () #2 0x00007f58cf767952 in ?? () from /usr/lib/libQtCore.so.4 #3 0x00007f58cf4e63ba in start_thread () from /lib/libpthread.so.0 #4 0x00007f58cd03cfcd in clone () from /lib/libc.so.6 #5 0x0000000000000000 in ?? () . Thread 5 (process 9561): #0 0x00007f58cf4ea2e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0 #1 0x00007f58cf768939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4 #2 0x00007f58cf764740 in QSemaphore::acquire () from /usr/lib/libQtCore.so.4 #3 0x00000000005396e4 in mixer::fifoWriter::run () #4 0x00007f58cf767952 in ?? () from /usr/lib/libQtCore.so.4 #5 0x00007f58cf4e63ba in start_thread () from /lib/libpthread.so.0 #6 0x00007f58cd03cfcd in clone () from /lib/libc.so.6 #7 0x0000000000000000 in ?? () . Thread 4 (process 9559): #0 0x00007f58cd033496 in poll () from /lib/libc.so.6 #1 0x00007f58ceb25e3d in ?? () from /usr/lib/libpulse.so.0 #2 0x00007f58ceb185a9 in pa_mainloop_poll () from /usr/lib/libpulse.so.0 #3 0x00007f58ceb19bf8 in pa_mainloop_iterate () from /usr/lib/libpulse.so.0 #4 0x00007f58ceb19cc0 in pa_mainloop_run () from /usr/lib/libpulse.so.0 #5 0x00007f58ceb25c3d in ?? () from /usr/lib/libpulse.so.0 #6 0x00007f58ceb49e10 in ?? () from /usr/lib/libpulse.so.0 #7 0x00007f58cf4e63ba in start_thread () from /lib/libpthread.so.0 #8 0x00007f58cd03cfcd in clone () from /lib/libc.so.6 #9 0x0000000000000000 in ?? () . Thread 3 (process 9555): #0 0x00007f58cf4ea2e9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0 #1 0x00007f58cf768939 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4 #2 0x000000000053c50b in MixerWorkerThread::run () #3 0x00007f58cf767952 in ?? () from /usr/lib/libQtCore.so.4 #4 0x00007f58cf4e63ba in start_thread () from /lib/libpthread.so.0 #5 0x00007f58cd03cfcd in clone () from /lib/libc.so.6 #6 0x0000000000000000 in ?? () . Thread 2 (process 9562): #0 0x00007f58cd033496 in poll () from /lib/libc.so.6 #1 0x00007f58cf04b64c in ?? () from /usr/lib/libasound.so.2 #2 0x00007f58cf04b9b7 in ?? () from /usr/lib/libasound.so.2 #3 0x00007f58cf08ab4a in ?? () from /usr/lib/libasound.so.2 #4 0x000000000058667a in audioALSA::run () #5 0x00007f58cf767952 in ?? () from /usr/lib/libQtCore.so.4 #6 0x00007f58cf4e63ba in start_thread () from /lib/libpthread.so.0 #7 0x00007f58cd03cfcd in clone () from /lib/libc.so.6 #8 0x0000000000000000 in ?? () . Thread 1 (process 9551): #0 0x00000000005bbd3f in instrumentTrack::processOutEvent () #1 0x0000000000523b3b in notePlayHandle::notePlayHandle () #2 0x00000000005b8881 in instrumentTrack::processInEvent () #3 0x000000000056648f in piano::handleKeyPress () #4 0x0000000000566c8e in pianoView::keyPressEvent () #5 0x00007f58d04d086a in QWidget::event () from /usr/lib/libQtGui.so.4 #6 0x00007f58d047f83d in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4 #7 0x00007f58d048896f in QApplication::notify () from /usr/lib/libQtGui.so.4 #8 0x00007f58cf85075c in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4 #9 0x00007f58d0514764 in ?? () from /usr/lib/libQtGui.so.4 #10 0x00007f58d0516ac2 in ?? () from /usr/lib/libQtGui.so.4 #11 0x00007f58d04ef66d in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4 #12 0x00007f58d0518514 in ?? () from /usr/lib/libQtGui.so.4 #13 0x00007f58cbd8420a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 #14 0x00007f58cbd878e0 in ?? () from /usr/lib/libglib-2.0.so.0 #15 0x00007f58cbd87a7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0 #16 0x00007f58cf879e6f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4 #17 0x00007f58d0517c9f in ?? () from /usr/lib/libQtGui.so.4 #18 0x00007f58cf84f002 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4 #19 0x00007f58cf84f3cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4 #20 0x00007f58cf851694 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4 #21 0x0000000000593b4e in main ()