addr = pthread_get_stackaddr_np(p); // high address (!)
	size = pthread_get_stacksize_np(p);

	// bounds points into the Go stack. TSAN can't see the synchronization
	// in Go around stack reuse.
	_cgo_tsan_acquire();
	bounds[0] = (uintptr)addr - size;
	bounds[1] = (uintptr)addr;
	_cgo_tsan_release();

	addr = __builtin_frame_address(0) + 4096 - size;
#endif
	pthread_attr_destroy(&attr);

	// bounds points into the Go stack. TSAN can't see the synchronization
	// in Go around stack reuse.
	_cgo_tsan_acquire();
	bounds[0] = (uintptr)addr;
	bounds[1] = (uintptr)addr + size;
	_cgo_tsan_release();