An improper locking bug due to the unreleased lock

		pthread_mutex_lock(&thd->ctrl_mutex);

		if (pthread_create(&thd->id, NULL, compress_worker_thread_func,

				   thd)) {

			msg("compress: pthread_create() failed: "

			    "errno = %d", errno);

			goto err;

		}

	}

	/* Wait for the threads to start */

	for (i = 0; i < n; i++) {

		comp_thread_ctxt_t *thd = threads + i;

		while (thd->started == FALSE)

			pthread_cond_wait(&thd->ctrl_cond, &thd->ctrl_mutex);

		pthread_mutex_unlock(&thd->ctrl_mutex);

	}

	return threads;

err:

	my_free(threads);

	return NULL;

}