runtime: skip test if strace crashes

Very occasionally, at least on linux/386, strace itself will crash in
TestUsingVDSO. Detect these crashes and just skip the test.

Fixes #63734.

Change-Id: I050494459d47dd96c0b8dc0b16353cb532fba93e
Reviewed-on: https://go-review.googlesource.com/c/go/+/556357
Auto-Submit: Austin Clements <austin@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/runtime/vdso_test.go b/src/runtime/vdso_test.go
index 126fd8d199..d025ba50c2 100644
--- a/src/runtime/vdso_test.go
+++ b/src/runtime/vdso_test.go
@@ -12,6 +12,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"syscall"
 	"testing"
 	"time"
 )
@@ -56,6 +57,16 @@ func TestUsingVDSO(t *testing.T) {
 		t.Logf("%s", out)
 	}
 	if err != nil {
+		if err := err.(*exec.ExitError); err != nil && err.Sys().(syscall.WaitStatus).Signaled() {
+			if !bytes.Contains(out, []byte("+++ killed by")) {
+				// strace itself occasionally crashes.
+				// Here, it exited with a signal, but
+				// the strace log didn't report any
+				// signal from the child process.
+				t.Log(err)
+				testenv.SkipFlaky(t, 63734)
+			}
+		}
 		t.Fatal(err)
 	}