tests: fix arch.arm.user.stack test failure

Fixes #97473 by:
- Marking the test as passed if the hardware executes user threads for a
  while without triggering a stack corruption, instead of waiting
    indefinitely.
- Adding a timeout to ensure the test exists gracefully if the issue is
  not reproduced.

Also fixes a stack corruption issue on QEMU targets, caused by
insufficient stack size and revealed by the timer change.

Signed-off-by: Sudan Landge <sudan.landge@arm.com>
(cherry picked from commit a55053b)

Author: wearyzen

boards/arm/mps2/Kconfig.defconfig

@@ -33,7 +33,7 @@ config TEST_EXTRA_STACK_SIZE
 
 endif # COVERAGE_GCOV
 
-endif
+endif # BOARD_MPS2_AN383 || BOARD_MPS2_AN385 || BOARD_MPS2_AN386 || BOARD_MPS2_AN500
 
 if BOARD_MPS2_AN521_CPU0 || BOARD_MPS2_AN521_CPU0_NS || BOARD_MPS2_AN521_CPU1
 
@@ -58,4 +58,11 @@ config UART_INTERRUPT_DRIVEN
 
 endif # SERIAL
 
+endif # BOARD_MPS2_AN521_CPU0 || BOARD_MPS2_AN521_CPU0_NS || BOARD_MPS2_AN521_CPU1
+
+if QEMU_TARGET
+
+config ISR_STACK_SIZE
+	default 4096
+
 endif

tests/arch/arm/arm_user_stack_test/src/main.c

@@ -23,8 +23,13 @@ volatile int *const attack_sp = &attack_stack[128];
 const int sysno = K_SYSCALL_K_UPTIME_TICKS;
 k_tid_t low_tid, hi_tid;
 
+struct k_timer timer;
+volatile ZTEST_BMEM uint64_t hi_thread_runs, test_completed;
+
 void k_sys_fatal_error_handler(unsigned int reason, const struct arch_esf *pEsf)
 {
+	test_completed = 1;
+	k_timer_stop(&timer);
 	ztest_test_pass();
 	k_thread_abort(low_tid);
 
@@ -37,6 +42,24 @@ void k_sys_fatal_error_handler(unsigned int reason, const struct arch_esf *pEsf)
 	}
 }
 
+static void timeout_handler(struct k_timer *timer)
+{
+	if (!test_completed) {
+
+		printf("hi_thread_runs: %lld\n", hi_thread_runs);
+		/* the timer times out after 120s,
+		 * by then hi_fn would have ran multiple times so
+		 * compare against a random number like 1000 to make sure that
+		 * hi_fn actually ran for a while
+		 */
+		if (hi_thread_runs > 1000) {
+			ztest_test_pass();
+		} else {
+			ztest_test_fail();
+		}
+	}
+}
+
 void attack_entry(void)
 {
 	printf("Call %s from %s\n", __func__, k_is_user_context() ? "user" : "kernel");
@@ -79,11 +102,15 @@ void hi_fn(void *arg1, void *arg2, void *arg3)
 	while (1) {
 		attack_sp[-2] = (int)attack_entry;
 		k_msleep(1);
+		hi_thread_runs++;
 	}
 }
 
 ZTEST(arm_user_stack_test, test_arm_user_stack_corruption)
 {
+	k_timer_init(&timer, timeout_handler, NULL);
+	k_timer_start(&timer, K_SECONDS(120), K_NO_WAIT);
+
 	low_tid = k_thread_create(&th0, stk0, K_THREAD_STACK_SIZEOF(stk0), low_fn, NULL, NULL, NULL,
 				  2,
 #ifdef CONFIG_FPU_SHARING

tests/arch/arm/arm_user_stack_test/testcase.yaml

@@ -1,6 +1,7 @@
 common:
   tags:
     - arm
+  timeout: 120
 tests:
   arch.arm.user.stack:
     filter: CONFIG_CPU_CORTEX_M