[PATCH] Fix race in pthread_mutex_lock while promoting to PTHREAD_MUTEX_ELISION_NP [BZ #23275]

[Florian Weimer]

On 06/12/2018 04:24 PM, Stefan Liebler wrote:
> The new testcase tst-mutex10 is triggering the race on s390x and intel. 
> Presumably also on power, but I don't have access to a power machine 
> with lock-elision. At least the code for power is the same as on the 
> other two architectures. Can somebody test it on power?

I tried the test case on a machine with:

Model:                 2.0 (pvr 004d 0200)
Model name:            POWER8 (raw), altivec supported

AT_HWCAP:        true_le archpmu vsx arch_2_06 dfp ic_snoop smt mmu fpu 
altivec ppc64 ppc32
AT_HWCAP2:       htm-nosc vcrypto tar isel ebb dscr htm arch_2_07

Presumably, that should have lock elision support?

If I apply the test (and only the test) to commit 
a745c837cb51c2efe8900740548cb68ec2a2f7ab, the resulting glibc does not 
show a test failure.

Thanks,
Florian