PR pending to fix an issue with randomization, see upstream #110
https://github.com/filebench/filebench/pull/143.patch
From 18c708a9771d9414fb3fa44bd916c05cdd43868c Mon Sep 17 00:00:00 2001
From: Tony Mason <fsgeek@cs.ubc.ca>
Date: Sat, 20 Jun 2020 20:39:23 +0000
Subject: [PATCH] Add ASR suppression logic

--- a/parser_gram.y
+++ b/parser_gram.y
@@ -45,6 +45,7 @@
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <sys/wait.h>
+#include <syscall.h>
 #include "parsertypes.h"
 #include "filebench.h"
 #include "utils.h"
@@ -1569,7 +1570,6 @@ parser_abort(int arg)
 static void
 master_mode(struct fbparams *fbparams) {
 	int ret;
-
 	printf("Filebench Version %s\n", FILEBENCH_VERSION);
 
 	yyin = fopen(fbparams->fscriptname, "r");
@@ -1620,6 +1620,66 @@ init_common()
 	fb_set_rlimit();
 }
 
+static void suppress_asr(char *const argv[], char * const envp[])
+{
+#if defined(SYS_personality)
+	unsigned index = 0;
+	size_t space = 0;
+	char **newenvp = (char **)malloc(space);
+	char *detect_string = "FILEBENCH_ASR_REINVOKED";
+	int current;
+	unsigned long persona = (unsigned long)~0;
+	const unsigned long asr_disabled = 0x0040000;
+
+	// Is this a reinvocation?
+	for (index = 0; envp[index]; index++) {
+		if (0 == strcmp(envp[index], detect_string)) {
+			// Yes - no further checking.
+			return;
+		}
+	}
+
+	// check if ASR is already disabled
+	current = (long) syscall(SYS_personality, persona);
+	if (-1 != current) {
+		persona = (unsigned long) current;
+		
+		if (asr_disabled == (persona & asr_disabled)) { // ASR disabled
+			return;
+		}
+
+		persona |= 0x0040000;
+		errno = 0;
+		current = (long) syscall(SYS_personality, persona);
+
+		if (-1 == current) {
+			// failed - give up
+			fprintf(stderr, "ASR disable failed - good luck\n");
+			return;
+		}
+
+		space = (index + 2) * sizeof(char *); // + 1 null entry + 1 new entry
+		if (NULL == newenvp) {
+			fprintf(stderr, "Reinvocation after disable ASR malloc failed\n");
+			return;
+		}
+
+		for (unsigned i = 0; i < index; i++) {
+			newenvp[i] = envp[i];
+		}
+		newenvp[index] = detect_string;
+		newenvp[index+1] = NULL;
+
+		if (-1 != current) {
+			if (0 > execvpe(argv[0], argv, newenvp)) {
+				fprintf(stderr, "execvpe failed (errno %d - %s)\n", errno, strerror(errno));
+			}
+		}
+	}
+#endif // SYS_personality
+
+}
+
 /*
  * Entry point for Filebench. Processes command line arguments. The -f option
  * will read in a workload file (the full name and extension must must be
@@ -1635,11 +1695,13 @@ init_common()
  * supplied workload file, or enters interactive mode.
  */
 int
-main(int argc, char *argv[])
+main(int argc, char *argv[], char *envp[])
 {
 	struct fbparams fbparams;
 	int mode;
 
+	suppress_asr(argv, envp);
+
 	/* parse_options() exits if detects wrong usage */
 	mode = parse_options(argc, argv, &fbparams);
 
@@ -1651,7 +1713,7 @@ main(int argc, char *argv[])
 
 	init_common();
 
-	if (mode == FB_MODE_MASTER)
+	if (mode == FB_MODE_MASTER) 
 		master_mode(&fbparams);
 
 	if (mode == FB_MODE_WORKER)