diff -ur apparmor-2.12.org/parser/parser_main.c apparmor-2.12/parser/parser_main.c
--- apparmor-2.12.org/parser/parser_main.c	2017-12-24 09:48:31.000000000 +0100
+++ apparmor-2.12/parser/parser_main.c	2018-01-10 09:33:09.568033805 +0100
@@ -811,6 +811,8 @@
 		skip_cache = 1;
 
 	if (cachename) {
+		cache_tstamp_final_check();
+
 		/* Load a binary cache if it exists and is newest */
 		if (cache_hit(cachename)) {
 			retval = process_binary(option, kernel_interface,
diff -ur apparmor-2.12.org/parser/policy_cache.c apparmor-2.12/parser/policy_cache.c
--- apparmor-2.12.org/parser/policy_cache.c	2017-12-24 09:48:31.000000000 +0100
+++ apparmor-2.12/parser/policy_cache.c	2018-01-10 09:30:27.533641865 +0100
@@ -78,6 +78,14 @@
 	cache_tstamp = t;
 }
 
+void cache_tstamp_final_check(void)
+{
+	if (tstamp_cmp(cache_tstamp, mru_policy_tstamp) != 0) {
+		pwarn(WARN_CACHE, "%s: cache mtime is different than policy files mtimes\n", progname);
+		mru_skip_cache = 1;
+	}
+}
+
 void update_mru_tstamp(FILE *file, const char *name)
 {
 	struct stat stat_file;
diff -ur apparmor-2.12.org/parser/policy_cache.h apparmor-2.12/parser/policy_cache.h
--- apparmor-2.12.org/parser/policy_cache.h	2017-12-24 09:48:31.000000000 +0100
+++ apparmor-2.12/parser/policy_cache.h	2018-01-10 09:31:45.412419437 +0100
@@ -39,6 +39,7 @@
 extern int debug_cache;
 
 void set_cache_tstamp(struct timespec t);
+void cache_tstamp_final_check(void);
 void update_mru_tstamp(FILE *file, const char *path);
 bool valid_cached_file_version(const char *cachename);
 char *cache_filename(const char *cachedir, const char *basename);