Bug in pthread_cond_timedwait in OSX with superlong timeout

pthread_cond_timedwait_bug.c

#include <stdio.h>
#include <pthread.h>

int main() {
    pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
    pthread_cond_t condvar = PTHREAD_COND_INITIALIZER;
    int r = pthread_mutex_lock(&mutex);
    if (r != 0) {
        perror("pthread_mutex_lock");
        return 1;
    }

    time_t now = time(0);
    struct timespec timeout = {
        // this version properly waits
        //.tv_sec = now + 0x100000000000000 - 0x1000000,
        // this exits immediately with unknown error 316
        .tv_sec = now + 0x100000000000000,
        .tv_nsec = 0,
    };

    printf("timespec %lld %lld\n", (long long) timeout.tv_sec, (long long) timeout.tv_nsec);

    int r2 = pthread_cond_timedwait(&condvar, &mutex, &timeout);
    if (r2 != 0) {
        perror("pthread_cond_timedwait");
        return 1;
    }
    printf("$\n");
    return 0;
}