Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/test/fixedbugs/bug320.go b/test/fixedbugs/bug320.go
new file mode 100644
index 0000000..0406b96
--- /dev/null
+++ b/test/fixedbugs/bug320.go
@@ -0,0 +1,45 @@
+// run
+
+// Copyright 2011 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
+
+func main() {
+	c := make(chan int, 1)
+	dummy := make(chan int)
+	v := 0x12345678
+	for i := 0; i < 10; i++ {
+		// 6g had a bug that caused select to pass &t to
+		// selectrecv before allocating the memory for t,
+		// which caused non-deterministic crashes.
+		// This test looks for the bug by checking that the
+		// value received actually ends up in t.
+		// If the allocation happens after storing through
+		// whatever garbage &t holds, the later reference
+		// to t in the case body will use the new pointer and
+		// not see the received value.
+		v += 0x1020304
+		c <- v
+		select {
+		case t := <-c:
+			go func() {
+				f(t)
+			}()
+			escape(&t)
+			if t != v {
+				println(i, v, t)
+				panic("wrong values")
+			}
+		case dummy <- 1:
+		}
+	}
+}
+
+func escape(*int) {
+}
+
+func f(int) {
+}
+