Initial commit: Go 1.23 release state

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)
+}