diff --git a/lib/libzpool/kernel.c b/lib/libzpool/kernel.c
index 445a7d6165..ab97636ba5 100644
--- a/lib/libzpool/kernel.c
+++ b/lib/libzpool/kernel.c
@@ -181,8 +181,8 @@ zk_thread_create(caddr_t stk, size_t  stksize, thread_func_t func, void *arg,
 	list_insert_head(&kthread_list, kt);
 	VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
 
-	VERIFY(pthread_create(&kt->t_tid, &kt->t_attr,
-			      (void *(*)(void *))func, arg) == 0);
+	VERIFY3U(pthread_create(&kt->t_tid, &kt->t_attr,
+			      (void *(*)(void *))func, arg), ==, 0);
 
 	return kt;
 }
diff --git a/scripts/Makefile.am b/scripts/Makefile.am
index 48c16c198a..bdc1f3b9e3 100644
--- a/scripts/Makefile.am
+++ b/scripts/Makefile.am
@@ -13,6 +13,7 @@ check:
 	@echo -n " ZTEST "
 	@echo    "===================================="
 	@echo
+	@ulimit -c unlimited
 	@$(ZTEST) -V
 	@echo
 	@echo -n "===================================="