#0  jack_port_get_buffer (port=0x0, nframes=1024) at port.c:581
  [Error: port.c was not found in source tree]
#1  0xf75e4b57 in fluid_jack_driver_process (nframes=1024, arg=0x5706e400) at ./src/drivers/fluid_jack.c:522
  517:                                      2 * audio_driver->num_output_ports,
  518:                                      audio_driver->output_bufs);
  519:   }
  520:   else if (audio_driver->num_output_ports == 1)
  521:   {
  522:     left = (float*) jack_port_get_buffer (audio_driver->output_ports[0], nframes);
  523:     right = (float*) jack_port_get_buffer (audio_driver->output_ports[1], nframes);
  524: 
  525:     fluid_synth_write_float (audio_driver->data, nframes, left, 0, 1, right, 0, 1);
  526:   }
  527:   else
#2  0xf72d4f60 in jack_process_thread_work (arg=0x5706e4d0) at client.c:2214
  [Error: client.c was not found in source tree]
#3  0xf72b62d5 in start_thread (arg=0xf6809b40) at pthread_create.c:333
  [Error: pthread_create.c was not found in source tree]
#4  0xf750559e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:113
  [Error: clone.S was not found in source tree]