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-rw-r--r--test/fixedbugs/issue11256.go53
1 files changed, 53 insertions, 0 deletions
diff --git a/test/fixedbugs/issue11256.go b/test/fixedbugs/issue11256.go
new file mode 100644
index 0000000..69fc3e8
--- /dev/null
+++ b/test/fixedbugs/issue11256.go
@@ -0,0 +1,53 @@
+// run
+
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test that stack barriers are reset when a goroutine exits without
+// returning.
+
+package main
+
+import (
+ "runtime"
+ "sync/atomic"
+ "time"
+)
+
+func main() {
+ // Let the garbage collector run concurrently.
+ runtime.GOMAXPROCS(2)
+
+ var x [100][]byte
+
+ for i := range x {
+ var done int32
+
+ go func() {
+ // Use enough stack to get stack barriers, but
+ // not so much that we go over _FixedStack.
+ // There's a very narrow window here on most
+ // OSs, so we basically can't do anything (not
+ // even a time.Sleep or a channel).
+ var buf [1024]byte
+ buf[0]++
+ for atomic.LoadInt32(&done) == 0 {
+ runtime.Gosched()
+ }
+ atomic.StoreInt32(&done, 0)
+ // Exit without unwinding stack barriers.
+ runtime.Goexit()
+ }()
+
+ // Generate some garbage.
+ x[i] = make([]byte, 1024*1024)
+
+ // Give GC some time to install stack barriers in the G.
+ time.Sleep(50 * time.Microsecond)
+ atomic.StoreInt32(&done, 1)
+ for atomic.LoadInt32(&done) == 1 {
+ runtime.Gosched()
+ }
+ }
+}