Sigmask cause some commands segmentfault

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In this function, uwsgi mask all signals:

void uwsgi_setup_thread_req(long core_id, struct wsgi_request *wsgi_req) {
	int i;
	sigset_t smask;


	pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &i);
	pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &i);
	pthread_setspecific(uwsgi.tur_key, (void *) wsgi_req);

	if (core_id > 0) {
		// block all signals on new threads
		sigfillset(&smask);
#ifdef UWSGI_DEBUG
		sigdelset(&smask, SIGSEGV);
#endif
		pthread_sigmask(SIG_BLOCK, &smask, NULL);

		// run per-thread socket hook
		struct uwsgi_socket *uwsgi_sock = uwsgi.sockets;
		while (uwsgi_sock) {
			if (uwsgi_sock->proto_thread_fixup) {
				uwsgi_sock->proto_thread_fixup(uwsgi_sock, core_id);
			}
			uwsgi_sock = uwsgi_sock->next;
		}

		for (i = 0; i < 256; i++) {
			if (uwsgi.p[i]->init_thread) {
				uwsgi.p[i]->init_thread(core_id);
			}
		}
	}

}

Meanwhile we use Subprocess.run to run lscpu：

Subprocess.run("lscpu")

It will cause segmentation fault because of signal handlers of the lscpu is masked.

// lscpu code:
memset(&act, 0, sizeof(act));
act.sa_sigaction = segv_handler;
act.sa_flags = SA_SIGINFO;

if (sigaction(SIGSEGV, &act, &oact))
    err(EXIT_FAILURE, _("cannot set signal handler"));

// Cause segmentfault if not vmware env.
vmware_bdoor(&eax, &ebx, &ecx, &edx);

if (sigaction(SIGSEGV, &oact, NULL))
    err(EXIT_FAILURE, _("cannot restore signal handler"));

Why uwsgi mask all signal? does there has other elegant implement instead of masking all signal?