Add a debug option to slow down acceptor threads so that we

can stabilize test c00080.

bin/varnishd/cache/cache_acceptor.c

@@ -466,6 +466,8 @@ vca_accept_task(struct worker *wrk, void *arg)
 				    TASK_QUEUE_VCA));
 			return;
 		}
+		if (!ps->pool->die && DO_DEBUG(DBG_SLOW_ACCEPTOR))
+			VTIM_sleep(2.0);
 
 		/*
 		 * We were able to hand off, so release this threads VCL

bin/varnishtest/tests/c00080.vtc

@@ -8,33 +8,19 @@ server s1 {
 varnish v1 -vcl+backend {} -start
 
 varnish v1 -cliok "param.set debug +drop_pools"
+varnish v1 -cliok "param.set debug +slow_acceptor"
 varnish v1 -cliok "param.set thread_pools 1"
 
 delay 2
 
-client c1 {
+client c1 -repeat 2 {
 	txreq
 	rxresp
 } -run
 
-varnish v1 -vsc *poo*
-
 delay 2
 
-client c1 {
-	txreq
-	rxresp
-} -run
-
-varnish v1 -vsc *poo*
-
-delay 2
-
-client c1 {
-       txreq
-       rxresp
-} -run
-
+varnish v1 -vsc *thr*
 varnish v1 -vsc *poo*
 varnish v1 -expect MAIN.pools == 1
 

include/tbl/debug_bits.h

@@ -45,6 +45,7 @@ DEBUG_BIT(VTC_MODE,		vtc_mode,	"Varnishtest Mode")
 DEBUG_BIT(WITNESS,		witness,	"Emit WITNESS lock records")
 DEBUG_BIT(VSM_KEEP,		vsm_keep,	"Keep the VSM file on restart")
 DEBUG_BIT(DROP_POOLS,		drop_pools,	"Drop thread pools (testing)")
+DEBUG_BIT(SLOW_ACCEPTOR,	slow_acceptor,	"Slow down Acceptor")
 #undef DEBUG_BIT
 
 /*lint -restore */