if (t->stamp_path) {
struct stat st;
- if (stat(t->stamp_path, &st) >= 0)
- t->last_trigger.realtime = timespec_load(&st.st_atim);
- else if (errno == ENOENT)
+ if (stat(t->stamp_path, &st) >= 0) {
+ usec_t ft;
+
+ /* Load the file timestamp, but only if it is actually in the past. If it is in the future,
+ * something is wrong with the system clock. */
+
+ ft = timespec_load(&st.st_mtim);
+ if (ft < now(CLOCK_REALTIME))
+ t->last_trigger.realtime = ft;
+ else {
+ char z[FORMAT_TIMESTAMP_MAX];
+
+ log_unit_warning(u, "Not using persistent file timestamp %s as it is in the future.",
+ format_timestamp(z, sizeof(z), ft));
+ }
+
+ } else if (errno == ENOENT)
/* The timer has never run before,
* make sure a stamp file exists.
*/