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-rw-r--r--test/fixedbugs/issue22781.go29
1 files changed, 29 insertions, 0 deletions
diff --git a/test/fixedbugs/issue22781.go b/test/fixedbugs/issue22781.go
new file mode 100644
index 0000000..5ad8239
--- /dev/null
+++ b/test/fixedbugs/issue22781.go
@@ -0,0 +1,29 @@
+// run
+
+// Copyright 2017 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/debug"
+
+type T struct {
+ // >= 16 bytes to avoid tiny alloc.
+ a, b int
+}
+
+func main() {
+ debug.SetGCPercent(1)
+ for i := 0; i < 100000; i++ {
+ m := make(map[*T]struct{}, 0)
+ for j := 0; j < 20; j++ {
+ // During the call to mapassign_fast64, the key argument
+ // was incorrectly treated as a uint64. If the stack was
+ // scanned during that call, the only pointer to k was
+ // missed, leading to *k being collected prematurely.
+ k := new(T)
+ m[k] = struct{}{}
+ }
+ }
+}