[PATCH] nptl: Add smoke test for pthread_getcpuclockid failure

[Florian Weimer]

* Siddhesh Poyarekar:

> +int
> +do_test (void)
> +{
> +  pthread_t t = xpthread_create (NULL, thr, NULL);
> +  xpthread_join (t);
> +
> +  clockid_t c;
> +  TEST_COMPARE (pthread_getcpuclockid (t, &c), ESRCH);

This test is invalid because the lifetime of t has ended.  This
use-after-free bug becomes visible if you run the test with
GLIBC_TUNABLES=glibc.pthread.stack_cache_size=0.

Thanks,
Florian