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
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