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-rw-r--r--misc/cgo/testsanitizers/testdata/msan4.go50
1 files changed, 50 insertions, 0 deletions
diff --git a/misc/cgo/testsanitizers/testdata/msan4.go b/misc/cgo/testsanitizers/testdata/msan4.go
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+// 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.
+
+package main
+
+// The memory profiler can call copy from a slice on the system stack,
+// which msan used to think meant a reference to uninitialized memory.
+
+/*
+#include <time.h>
+#include <unistd.h>
+
+extern void Nop(char*);
+
+// Use weak as a hack to permit defining a function even though we use export.
+void poison() __attribute__ ((weak));
+
+// Poison the stack.
+void poison() {
+ char a[1024];
+ Nop(&a[0]);
+}
+
+*/
+import "C"
+
+import (
+ "runtime"
+)
+
+func main() {
+ runtime.MemProfileRate = 1
+ start(100)
+}
+
+func start(i int) {
+ if i == 0 {
+ return
+ }
+ C.poison()
+ // Tie up a thread.
+ // We won't actually wait for this sleep to complete.
+ go func() { C.sleep(1) }()
+ start(i - 1)
+}
+
+//export Nop
+func Nop(*C.char) {
+}