[master] 4703d92 Log a message on clock step

[Martin Blix Grydeland]

commit 4703d9207adbbddef5babec5bce6b6e918ffddba
Author: Martin Blix Grydeland <martin at varnish-software.com>
Date:   Fri Nov 4 13:20:47 2016 +0100

    Log a message on clock step

diff --git a/bin/varnishd/cache/cache_session.c b/bin/varnishd/cache/cache_session.c
index 5e263e2..9bcb824 100644
--- a/bin/varnishd/cache/cache_session.c
+++ b/bin/varnishd/cache/cache_session.c
@@ -519,6 +519,9 @@ SES_Delete(struct sess *sp, enum sess_close reason, double now)
 		now = VTIM_real();
 	AZ(isnan(sp->t_open));
 	if (now < sp->t_open) {
+		VSL(SLT_Debug, sp->vxid,
+		    "Clock step (now=%f < t_open=%f)",
+		    now, sp->t_open);
 		if (now + cache_param->clock_step < sp->t_open)
 			WRONG("Clock step detected");
 		now = sp->t_open; /* Do not log negatives */