index 389748960..07f3400f9 100644

--- a/coregrind/vgdb-invoker-ptrace.c

+++ b/coregrind/vgdb-invoker-ptrace.c

@@ -300,6 +300,10 @@ Bool waitstopped (pid_t pid, int signal_expected, const char *msg)

          // realloc a bigger queue, and store new signal at the end.

          // This is not very efficient but we assume not many sigs are queued.

+         if (signal_queue_sz >= 64) {

+            DEBUG(0, "too many queued signals while waiting for SIGSTOP\n");

+            return False;

+         }

          signal_queue_sz++;

          signal_queue = vrealloc(signal_queue,

                                  sizeof(siginfo_t) * signal_queue_sz);