Comment 6 for bug 1436162

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
+*/