[Qemu-devel] [Bug 1563612] [NEW] pulseaudio applications crash under linux-user-x86_64

[Bla Blub]

Public bug reported:

Running a simple application that uses pulseaudio under qemu-i386 or
qemu-x86_64 makes it crash (tested on Debian 8.0):

# apt-get install build-essential qemu-user libpulse-dev pulseaudio
$ cat > test.c << __EOF
#include <pulse/simple.h>

int main(void) {
        pa_simple *s;
        pa_sample_spec ss;
        ss.format = PA_SAMPLE_S16NE;
        ss.channels = 2;
        ss.rate = 44100;
        s = pa_simple_new(NULL,               // Use the default server.
                          "Fooapp",           // Our application's name.
                          PA_STREAM_PLAYBACK,
                          NULL,               // Use the default device.
                          "Music",            // Description of our stream.
                          &ss,                // Our sample format.
                          NULL,               // Use default channel map
                          NULL,               // Use default buffering
                                              // attributes.
                          NULL                // Ignore error code.
                        );

        int16_t buf[2 * 1000];
        int i;
        memset(buf, 0, sizeof buf);
        for (i = 0; i < 44; i++) {
                pa_simple_write(s, buf, sizeof buf, NULL);
        }

        pa_simple_free(s);

        return 0;
}
__EOF
$ gcc test.c -o test -lpulse -lpulse-simple
$ ./test
<no output, no error>
$ qemu-x86_64 ./test
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Segmentation fault
$


I think this is related to the futex system call. In an attempt to debug the 
problem, I compiled pulseaudio in debug mode and it hit an assertion failure in 
pa_mutex_unlock.

Thank you for developing QEMU.  :-)

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: linux-user

** Attachment added: "test program"
   https://bugs.launchpad.net/bugs/1563612/+attachment/4616535/+files/test.c

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https://bugs.launchpad.net/bugs/1563612

Title:
  pulseaudio applications crash under linux-user-x86_64

Status in QEMU:
  New

Bug description:
  Running a simple application that uses pulseaudio under qemu-i386 or
  qemu-x86_64 makes it crash (tested on Debian 8.0):

  # apt-get install build-essential qemu-user libpulse-dev pulseaudio
  $ cat > test.c << __EOF
  #include <pulse/simple.h>

  int main(void) {
        pa_simple *s;
        pa_sample_spec ss;
        ss.format = PA_SAMPLE_S16NE;
        ss.channels = 2;
        ss.rate = 44100;
        s = pa_simple_new(NULL,               // Use the default server.
                          "Fooapp",           // Our application's name.
                          PA_STREAM_PLAYBACK,
                          NULL,               // Use the default device.
                          "Music",            // Description of our stream.
                          &ss,                // Our sample format.
                          NULL,               // Use default channel map
                          NULL,               // Use default buffering
                                              // attributes.
                          NULL                // Ignore error code.
                        );

        int16_t buf[2 * 1000];
          int i;
          memset(buf, 0, sizeof buf);
        for (i = 0; i < 44; i++) {
                pa_simple_write(s, buf, sizeof buf, NULL);
        }

          pa_simple_free(s);

        return 0;
  }
  __EOF
  $ gcc test.c -o test -lpulse -lpulse-simple
  $ ./test
  <no output, no error>
  $ qemu-x86_64 ./test
  qemu: uncaught target signal 11 (Segmentation fault) - core dumped
  Segmentation fault
  $

  
  I think this is related to the futex system call. In an attempt to debug the 
problem, I compiled pulseaudio in debug mode and it hit an assertion failure in 
pa_mutex_unlock.

  Thank you for developing QEMU.  :-)

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