diff --git a/cmd/stress/stress.go b/cmd/stress/stress.go
index 9aebbf6d..f02fa2a7 100644
--- a/cmd/stress/stress.go
+++ b/cmd/stress/stress.go
@@ -29,6 +29,7 @@ var (
 	flagTimeout = flag.Duration("timeout", 10*time.Minute, "timeout each process after `duration`")
 	flagKill    = flag.Bool("kill", true, "kill timed out processes if true, otherwise just print pid (to attach with gdb)")
 	flagFailure = flag.String("failure", "", "fail only if output matches `regexp`")
+	flagIgnore  = flag.String("ignore", "", "ignore failure if output matches `regexp`")
 )
 
 func main() {
@@ -37,7 +38,7 @@ func main() {
 		flag.Usage()
 		os.Exit(1)
 	}
-	var failureRe *regexp.Regexp
+	var failureRe, ignoreRe *regexp.Regexp
 	if *flagFailure != "" {
 		var err error
 		if failureRe, err = regexp.Compile(*flagFailure); err != nil {
@@ -45,6 +46,13 @@ func main() {
 			os.Exit(1)
 		}
 	}
+	if *flagIgnore != "" {
+		var err error
+		if ignoreRe, err = regexp.Compile(*flagIgnore); err != nil {
+			fmt.Println("bad ignore regexp:", err)
+			os.Exit(1)
+		}
+	}
 	res := make(chan []byte)
 	for i := 0; i < *flagP; i++ {
 		go func() {
@@ -73,7 +81,7 @@ func main() {
 				}
 				out, err := cmd.CombinedOutput()
 				close(done)
-				if err != nil && (failureRe == nil || failureRe.Match(out)) {
+				if err != nil && (failureRe == nil || failureRe.Match(out)) && (ignoreRe == nil || !ignoreRe.Match(out)) {
 					out = append(out, fmt.Sprintf("\n\nERROR: %v\n", err)...)
 				} else {
 					out = []byte{}