[valgrind] [Bug 445743] "The impossible happened: mutex is locked simultaneously by two threads" while using mutexes with priority inheritance and signals

[Paul Floyd]

https://bugs.kde.org/show_bug.cgi?id=445743

--- Comment #10 from Paul Floyd <pjfl...@wanadoo.fr> ---
On FreeBSD, single stepping out after the user interrupt I get here

sleep_in_kernel:
        if (abstime == NULL)
                ret = __thr_umutex_lock(&m->m_lock, id); // RETURN HERE UNDER
VG
        else if (__predict_false(abstime->tv_nsec < 0 ||
            abstime->tv_nsec >= 1000000000))
                ret = EINVAL;
        else
                ret = __thr_umutex_timedlock(&m->m_lock, id, abstime);
done:
        if (ret == 0 || ret == EOWNERDEAD) { // RETURN HERE STANDALONE
                enqueue_mutex(curthread, m, ret);
                if (ret == EOWNERDEAD)
                        m->m_lock.m_flags |= UMUTEX_NONCONSISTENT;
        }
        return (ret);
}

Retcode is 4, invalid.

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