Initial commit: Go 1.23 release state

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()
+		}
+	}
+}