Fixed possible use of old cached times if runtime went backwards.
If ngx_time_sigsafe_update() updated only ngx_cached_err_log_time, and
then clock was adjusted backwards, the cached_time[slot].sec might
accidentally match current seconds on next ngx_time_update() call,
resulting in various cached times not being updated.
Fix is to clear the cached_time[slot].sec to explicitly mark cached times
are stale and need updating.
diff --git a/src/core/ngx_times.c b/src/core/ngx_times.c
index ed1bf64..77490fa 100644
--- a/src/core/ngx_times.c
+++ b/src/core/ngx_times.c
@@ -211,6 +211,10 @@
slot++;
}
+ tp = &cached_time[slot];
+
+ tp->sec = 0;
+
ngx_gmtime(sec + cached_gmtoff * 60, &tm);
p = &cached_err_log_time[slot][0];
