runtime: increase stack limit in a test

Otherwise the test is flaky.
Fixes #4698.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7133071

diff --git a/src/pkg/runtime/stack_test.go b/src/pkg/runtime/stack_test.go
index f04bddc764a57d6b6f0dc66eef9052b318cb3e41..759f7c46ed058c952d65b64b82385541c41cb20f 100644 (file)
--- a/src/pkg/runtime/stack_test.go
+++ b/src/pkg/runtime/stack_test.go
@@ -1571,7 +1571,7 @@ func TestStackMem(t *testing.T) {
        if consumed > estimate {
                t.Fatalf("Stack mem: want %v, got %v", estimate, consumed)
        }
-       if s1.StackInuse > 1<<20 {
-               t.Fatalf("Stack inuse: want %v, got %v", 1<<20, s1.StackInuse)
+       if s1.StackInuse > 4<<20 {
+               t.Fatalf("Stack inuse: want %v, got %v", 4<<20, s1.StackInuse)
        }
 }