Package: gcc-7 Version: 7.2.0-17 Severity: normal When pthread_barrier.c from glibc is compiled with gcc-7 and -mcpu=ultrasparc (as opposed to the default -mcpu=v9), the futex code is miscompiled. This causes the rt/tst-mqueue5, nptl/tst-signal6 and nptl/tst-tls2 to fail with:
The futex facility returned an unexpected error code. I haven't been able to reproduce the issue with GCC 6. That said it looks like the issue is quite dependent of the instruction scheduling as slightly changing the code around for debugging purpose makes the problem to vanish.
