From 9a804293f9ace6c6044f6bee187925fabf8d34c7 Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.i.king@gmail.com>
Date: Wed, 1 May 2024 00:00:21 +0100
Subject: [PATCH] stress-sigfpe: handle unexpected SIGILL signals

Some libc math libs may throw SIGILL on division by zero,
the C spec says the behaviour is undefined, so catch these
weird SIGILL behaviours just in case.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
---
 stress-sigfpe.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/stress-sigfpe.c b/stress-sigfpe.c
index cd7f8edf4..fbf4a5b03 100644
--- a/stress-sigfpe.c
+++ b/stress-sigfpe.c
@@ -229,6 +229,16 @@ static int stress_sigfpe(stress_args_t *args)
 			args->name, errno, strerror(errno));
 		return EXIT_FAILURE;
 	}
+	/*
+	 *  division by zero is undefined, some C libs
+	 *  may even throw SIGILL, so catch these.
+	 */
+	ret = sigaction(SIGILL, &action, NULL);
+	if (ret < 0) {
+		pr_err("%s: sigaction SIGILL: errno=%d (%s)\n",
+			args->name, errno, strerror(errno));
+		return EXIT_FAILURE;
+	}
 
 	(void)alarm(0);
 	stress_set_proc_state(args->name, STRESS_STATE_RUN);