8332894: ubsan: vmError.cpp:2090:26: runtime error: division by zero

Reviewed-by: dholmes, stuefe

src/hotspot/share/utilities/vmError.cpp

@@ -2082,8 +2082,13 @@ bool VMError::check_timeout() {
 #ifdef ASSERT
 typedef void (*voidfun_t)();
 
-// Crash with an authentic sigfpe
+// Crash with an authentic sigfpe; behavior is subtly different from a real signal
+// compared to one generated with raise (asynchronous vs synchronous). See JDK-8065895.
 volatile int sigfpe_int = 0;
+
+#if defined(__clang__) || defined(__GNUC__)
+__attribute__((no_sanitize("undefined")))
+#endif
 static void ALWAYSINLINE crash_with_sigfpe() {
 
   // generate a native synchronous SIGFPE where possible;