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-rw-r--r--test/fixedbugs/issue15281.go65
1 files changed, 65 insertions, 0 deletions
diff --git a/test/fixedbugs/issue15281.go b/test/fixedbugs/issue15281.go
new file mode 100644
index 0000000..390867c
--- /dev/null
+++ b/test/fixedbugs/issue15281.go
@@ -0,0 +1,65 @@
+// run
+
+// Copyright 2016 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.
+
+package main
+
+import "runtime"
+
+func main() {
+ {
+ x := inuse()
+ c := make(chan []byte, 10)
+ c <- make([]byte, 10<<20)
+ close(c)
+ f1(c, x)
+ }
+ {
+ x := inuse()
+ c := make(chan []byte, 10)
+ c <- make([]byte, 10<<20)
+ close(c)
+ f2(c, x)
+ }
+}
+
+func f1(c chan []byte, start int64) {
+ for x := range c {
+ if delta := inuse() - start; delta < 9<<20 {
+ println("BUG: f1: after alloc: expected delta at least 9MB, got: ", delta)
+ println(x)
+ }
+ x = nil
+ if delta := inuse() - start; delta > 1<<20 {
+ println("BUG: f1: after alloc: expected delta below 1MB, got: ", delta)
+ println(x)
+ }
+ }
+}
+
+func f2(c chan []byte, start int64) {
+ for {
+ x, ok := <-c
+ if !ok {
+ break
+ }
+ if delta := inuse() - start; delta < 9<<20 {
+ println("BUG: f2: after alloc: expected delta at least 9MB, got: ", delta)
+ println(x)
+ }
+ x = nil
+ if delta := inuse() - start; delta > 1<<20 {
+ println("BUG: f2: after alloc: expected delta below 1MB, got: ", delta)
+ println(x)
+ }
+ }
+}
+
+func inuse() int64 {
+ runtime.GC()
+ var st runtime.MemStats
+ runtime.ReadMemStats(&st)
+ return int64(st.Alloc)
+}