runtime/pprof: add a test for gccgo bug #29448
With gccgo, if a profiling signal arrives in certain time during
traceback, it may crash or hang. The fix is CL 156037 and
CL 156038. This CL adds a test.
Updates #29448.
Change-Id: Idb36af176b4865b8fb31a85cad185ed4c07ade0c
Reviewed-on: https://go-review.googlesource.com/c/156018
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/src/runtime/pprof/pprof_test.go b/src/runtime/pprof/pprof_test.go
index e395d15..7c6043f 100644
--- a/src/runtime/pprof/pprof_test.go
+++ b/src/runtime/pprof/pprof_test.go
@@ -1010,3 +1010,38 @@
atomic.StoreUint64(&flag, 1)
<-done
}
+
+func TestTracebackAll(t *testing.T) {
+ // With gccgo, if a profiling signal arrives at the wrong time
+ // during traceback, it may crash or hang. See issue #29448.
+ f, err := ioutil.TempFile("", "proftraceback")
+ if err != nil {
+ t.Fatalf("TempFile: %v", err)
+ }
+ defer os.Remove(f.Name())
+ defer f.Close()
+
+ if err := StartCPUProfile(f); err != nil {
+ t.Fatal(err)
+ }
+ defer StopCPUProfile()
+
+ ch := make(chan int)
+ defer close(ch)
+
+ count := 10
+ for i := 0; i < count; i++ {
+ go func() {
+ <-ch // block
+ }()
+ }
+
+ N := 10000
+ if testing.Short() {
+ N = 500
+ }
+ buf := make([]byte, 10*1024)
+ for i := 0; i < N; i++ {
+ runtime.Stack(buf, true)
+ }
+}
