ndb - bug#11623 - "ndb become inresponsive but did not really die"

  block signals in threads making main process get all signals...

ndb/src/common/portlib/NdbThread.c

@@ -52,6 +52,16 @@ ndb_thread_wrapper(void* _ss){
       pthread_sigmask(SIG_BLOCK, &mask, 0);
     }
 #endif
+    {
+      /**
+       * Block all signals to thread by default
+       *   let them go to main process instead
+       */
+      sigset_t mask;
+      sigfillset(&mask);
+      pthread_sigmask(SIG_BLOCK, &mask, 0);
+    }      
+    
     {
       void *ret;
       struct NdbThread * ss = (struct NdbThread *)_ss;