pkg/repro: fix no output timeout

We duplicated the no output timeout in the repro package,
and it got out of sync. It's not 3 mins now, but 5 mins.
Remove the duplication and fix this.

pkg/repro/repro.go

@@ -254,9 +254,9 @@ func (ctx *context) extractProg(entries []*prog.LogEntry) (*Result, error) {
 	}
 
 	// The shortest duration is 10 seconds to detect simple crashes (i.e. no races and no hangs).
-	// The longest duration is 5 minutes to catch races and hangs. Note that this value must be larger
-	// than hang/no output detection duration in vm.MonitorExecution, which is currently set to 3 mins.
-	timeouts := []time.Duration{10 * time.Second, 1 * time.Minute, 5 * time.Minute}
+	// The longest duration is 6 minutes to catch races and hangs. Note that this value must be larger
+	// than hang/no output detection duration in vm.MonitorExecution, which is currently set to 5 mins.
+	timeouts := []time.Duration{10 * time.Second, 1 * time.Minute, vm.NoOutputTimeout + time.Minute}
 
 	for _, timeout := range timeouts {
 		// Execute each program separately to detect simple crashes caused by a single program.

vm/vm.go

@@ -225,7 +225,7 @@ func (inst *Instance) MonitorExecution(outc <-chan []byte, errc <-chan error,
 			// in 140-280s detection delay.
 			// So the current timeout is 5 mins (300s).
 			// We don't want it to be too long too because it will waste time on real hangs.
-			if time.Since(lastExecuteTime) < noOutputTimeout {
+			if time.Since(lastExecuteTime) < NoOutputTimeout {
 				break
 			}
 			diag, wait := inst.Diagnose()
@@ -347,7 +347,7 @@ var (
 	beforeContext = 1024 << 10
 	afterContext  = 128 << 10
 
+	NoOutputTimeout      = 5 * time.Minute
 	tickerPeriod         = 10 * time.Second
-	noOutputTimeout      = 5 * time.Minute
 	waitForOutputTimeout = 10 * time.Second
 )

vm/vm_test.go

@@ -72,7 +72,7 @@ func (inst *testInstance) Close() {
 func init() {
 	beforeContext = 200
 	tickerPeriod = 1 * time.Second
-	noOutputTimeout = 5 * time.Second
+	NoOutputTimeout = 5 * time.Second
 	waitForOutputTimeout = 3 * time.Second
 
 	ctor := func(env *vmimpl.Env) (vmimpl.Pool, error) {