bootopt = RB_AUTOBOOT;
	newpanic = 0;
	if (panicstr)
		bootopt |= RB_NOSYNC;
	else {
		bootopt |= RB_DUMP;
		panicstr = fmt;
		newpanic = 1;
	}

	printf("\n             o       _      _          _\n");
	printf("    _o      /\\_    _ \\\\o   (_)\\__/o   (_)\n");
	printf("  _< \\_    _>(_)  (_)/<_     \\_| \\    _|/' \\/\n");
	printf(" (_)>(_)  (_)         (_)    (_)     (_)'  _\\o_\n\n");

	va_start(ap, fmt);
	if (newpanic) {
		(void)vsnprintf(buf, sizeof(buf), fmt, ap);
		panicstr = buf;
		cngrab();
		printf("panic: %s\n", buf);
	} else {
		printf("panic: ");
		vprintf(fmt, ap);
		printf("\n");
	}
	va_end(ap);