fix: enable timely delivery of POSIX signals while busy-looping

regression/apps/Makefile

@@ -10,6 +10,7 @@ REGRESSION_BUILD_DIR ?= $(INITRAMFS)/regression
 
 # These test apps are sorted by name
 TEST_APPS := \
+	alarm \
 	clone3 \
 	eventfd2 \
 	execve \

regression/apps/alarm/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: MPL-2.0
+
+include ../test_common.mk
+
+EXTRA_C_FLAGS := -static

regression/apps/alarm/alarm.c

@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#include <unistd.h>
+
+int main()
+{
+	alarm(3);
+	while (1) {
+	}
+	return 0;
+}