Fix deadlock

src/core/lib/iomgr/ev_epollex_linux.c

@@ -665,7 +665,9 @@ static grpc_error *pollset_kick_all(grpc_pollset *pollset) {
   if (pollset->root_worker != NULL) {
     grpc_pollset_worker *worker = pollset->root_worker;
     do {
-      gpr_mu_lock(&worker->pollable->po.mu);
+      if (worker->pollable != &pollset->pollable) {
+        gpr_mu_lock(&worker->pollable->po.mu);
+      }
       if (worker->initialized_cv) {
         worker->kicked = true;
         gpr_cv_signal(&worker->cv);
@@ -673,7 +675,9 @@ static grpc_error *pollset_kick_all(grpc_pollset *pollset) {
         append_error(&error, grpc_wakeup_fd_wakeup(&worker->pollable->wakeup),
                      "pollset_shutdown");
       }
-      gpr_mu_unlock(&worker->pollable->po.mu);
+      if (worker->pollable != &pollset->pollable) {
+        gpr_mu_unlock(&worker->pollable->po.mu);
+      }
 
       worker = worker->links[PWL_POLLSET].next;
     } while (worker != pollset->root_worker);