--- /dev/null
+--- a/workers/worker_fork.c
++++ b/workers/worker_fork.c
+@@ -396,7 +396,7 @@ static int worker_fork_process(void *in_
+ worker_fork_update_children(ctx);
+
+ child = NULL;
+- for (i = 0; i < ctx->children_count; i++) {
++ for (i = 0; i < ctx->children_count && i < ctx->max_children; i++) {
+ if (ctx->children[i]->busy == 0) {
+ child = ctx->children[i];
+ break;
+@@ -426,7 +426,8 @@ static int worker_fork_process(void *in_
+ /*
+ * We have to fork off a new child.
+ */
+- if (ctx->children_count < ctx->max_children)
++ if (ctx->children_count < ctx->max_children ||
++ (ruleset_flags(&ctx->settings->rules, uevent) & FLAG_SLOW))
+ child = worker_fork_spawn(ctx);
+
+ for (i = 0; i < uevent->env_vars_c; i++) {