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[Ricardo Salveti <rsalveti@xxxxxxxxxxxx>]

So this issue is a combination of the following patches:
https://sourceware.org/git/?p=glibc.git;a=commit;h=47c5adebd2c864a098c3af66e61e1147dc3cf0b4
https://sourceware.org/git/?p=glibc.git;a=commit;h=03d41216fe09fc71a2750946af8fe2892bf4feb5

Basically the main problem is that futex_atomic_cmpxchg_inatomic got
disabled, even though we have that well supported in our kernels.

I just did another build (in canonical-arm-dev) including the patch bellow, and with that I'm unable to reproduce this bug:
Index: glibc-2.21/sysdeps/unix/sysv/linux/arm/kernel-features.h
===================================================================
--- glibc-2.21.orig/sysdeps/unix/sysv/linux/arm/kernel-features.h
+++ glibc-2.21/sysdeps/unix/sysv/linux/arm/kernel-features.h
@@ -37,8 +37,10 @@
 /* The ARM kernel before 3.14.3 may or may not support
    futex_atomic_cmpxchg_inatomic, depending on kernel
    configuration.  */
+/*
 #if __LINUX_KERNEL_VERSION < 0x030E03
 # undef __ASSUME_FUTEX_LOCK_PI
 # undef __ASSUME_REQUEUE_PI
 # undef __ASSUME_SET_ROBUST_LIST
 #endif
+*/

** Changed in: gst-plugins-good1.0 (Ubuntu)
       Status: Confirmed => Invalid

** Changed in: pulseaudio (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1436162

Title:
  [pulsesink] abort at pthread_mutex_unlock(&m->mutex) == 0' failed at
  pulsecore/mutex-posix.c:118, function pa_mutex_unlock() with libc 2.21

Status in glibc package in Ubuntu:
  Confirmed
Status in gst-plugins-good1.0 package in Ubuntu:
  Invalid
Status in pulseaudio package in Ubuntu:
  Invalid

Bug description:
  current build number: 146
  device name: m75
  channel: ubuntu-touch/vivid-proposed
  last update: 2015-03-24 13:57:03
  version version: 146

  After libc 2.21 landed, pulsesink fails constantly when pausing or
  seeking the active pipeline.

  Abort message:
  Assertion 'pthread_mutex_unlock(&m->mutex) == 0' failed at pulsecore/mutex-posix.c:118, function pa_mutex_unlock(). Aborting.

  This is basically happens when it tries to unlock a mutex that is
  already unlocked.

  This issue doesn't happen with libc 2.19.

  To reproduce the issue:
  GST_DEBUG=*pulse*:5 gst-launch-1.0 playbin uri=file:///tmp/foobar.mp3

  Then when playing, just hit control+c, which will then pause the
  pipeline, causing the crash. The crash happens with most of the times
  you pause or seek the pipeline.

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