diff --git a/lib/u_async.c b/lib/u_async.c
index e7399e58..3d54ccdc 100644
--- a/lib/u_async.c
+++ b/lib/u_async.c
@@ -1157,47 +1157,58 @@ void uasync_poll(struct UASYNC* ua, int timeout_tb) {
             int idx = ua->sockets->active_indices[i];
             struct socket_node* node = &ua->sockets->sockets[idx];
             if (!node->active) continue;
-            
+
+            /* Снапшот полей — коллбэки могут реаллоцировать ua->sockets (node станет висячим) */
+            int                 local_fd         = node->fd;
+            socket_t            local_sock       = node->sock;
+            int                 local_type       = node->type;
+            void*               local_ud         = node->user_data;
+            socket_callback_t   local_except     = node->except_cbk;
+            socket_callback_t   local_read       = node->read_cbk;
+            socket_callback_t   local_write      = node->write_cbk;
+            socket_t_callback_t local_read_sock  = node->read_cbk_sock;
+            socket_t_callback_t local_write_sock = node->write_cbk_sock;
+
             SOCKET s;
-            if (node->type == SOCKET_NODE_TYPE_SOCK) {
-                s = node->sock;
+            if (local_type == SOCKET_NODE_TYPE_SOCK) {
+                s = local_sock;
             } else {
-                s = (SOCKET)node->fd;
+                s = (SOCKET)local_fd;
             }
-            
+
             int has_read = FD_ISSET(s, &read_fds);
             int has_write = FD_ISSET(s, &write_fds);
             int has_except = FD_ISSET(s, &except_fds);
-            
+
             if (!has_read && !has_write && !has_except) continue;
             DEBUG_DEBUG(DEBUG_CATEGORY_SYS, "select→fd=%d r=%d w=%d e=%d", (int)s, has_read, has_write, has_except);
-            
+
             if (has_except) {
-                if (node->except_cbk) {
-                    node->except_cbk(node->fd, node->user_data);
+                if (local_except) {
+                    local_except(local_fd, local_ud);
                 }
             }
-            
+
             if (has_read) {
-                if (node->type == SOCKET_NODE_TYPE_SOCK) {
-                    if (node->read_cbk_sock) {
-                        node->read_cbk_sock(node->sock, node->user_data);
+                if (local_type == SOCKET_NODE_TYPE_SOCK) {
+                    if (local_read_sock) {
+                        local_read_sock(local_sock, local_ud);
                     }
                 } else {
-                    if (node->read_cbk) {
-                        node->read_cbk(node->fd, node->user_data);
+                    if (local_read) {
+                        local_read(local_fd, local_ud);
                     }
                 }
             }
-            
+
             if (has_write) {
-                if (node->type == SOCKET_NODE_TYPE_SOCK) {
-                    if (node->write_cbk_sock) {
-                        node->write_cbk_sock(node->sock, node->user_data);
+                if (local_type == SOCKET_NODE_TYPE_SOCK) {
+                    if (local_write_sock) {
+                        local_write_sock(local_sock, local_ud);
                     }
                 } else {
-                    if (node->write_cbk) {
-                        node->write_cbk(node->fd, node->user_data);
+                    if (local_write) {
+                        local_write(local_fd, local_ud);
                     }
                 }
             }
@@ -1249,45 +1260,56 @@ void uasync_poll(struct UASYNC* ua, int timeout_tb) {
                 node = socket_array_get_by_sock(ua->sockets, lookup_sock);
             }
             if (!node) continue;  // Socket may have been removed
-            
+
+            /* Снапшот полей — коллбэки могут реаллоцировать ua->sockets (node станет висячим) */
+            int                 local_fd         = node->fd;
+            socket_t            local_sock       = node->sock;
+            int                 local_type       = node->type;
+            void*               local_ud         = node->user_data;
+            socket_callback_t   local_except     = node->except_cbk;
+            socket_callback_t   local_read       = node->read_cbk;
+            socket_callback_t   local_write      = node->write_cbk;
+            socket_t_callback_t local_read_sock  = node->read_cbk_sock;
+            socket_t_callback_t local_write_sock = node->write_cbk_sock;
+
             /* Read readiness BEFORE error — avoid losing data on combined IN+ERR/HUP events */
             if (ua->poll_fds[i].revents & POLLIN) {
-                if (node->type == SOCKET_NODE_TYPE_SOCK) {
-                    if (node->read_cbk_sock) {
-                        node->read_cbk_sock(node->sock, node->user_data);
+                if (local_type == SOCKET_NODE_TYPE_SOCK) {
+                    if (local_read_sock) {
+                        local_read_sock(local_sock, local_ud);
                     }
                 } else {
-                    if (node->read_cbk) {
-                        node->read_cbk(node->fd, node->user_data);
+                    if (local_read) {
+                        local_read(local_fd, local_ud);
                     }
                 }
             }
-            
+
             /* Write readiness BEFORE error — flush pending writes before handling HUP */
             if (ua->poll_fds[i].revents & POLLOUT) {
-                if (node->type == SOCKET_NODE_TYPE_SOCK) {
-                    if (node->write_cbk_sock) {
-                        node->write_cbk_sock(node->sock, node->user_data);
+                if (local_type == SOCKET_NODE_TYPE_SOCK) {
+                    if (local_write_sock) {
+                        local_write_sock(local_sock, local_ud);
                     }
                 } else {
-                    if (node->write_cbk) {
-                        node->write_cbk(node->fd, node->user_data);
+                    if (local_write) {
+                        local_write(local_fd, local_ud);
                     }
                 }
             }
-            
+
             /* Check for error conditions LAST — I/O handlers drain/process data first */
             if (ua->poll_fds[i].revents & (POLLERR | POLLHUP | POLLNVAL)) {
                 /* Treat as exceptional condition */
-                if (node->except_cbk) {
-                    node->except_cbk(node->fd, node->user_data);
+                if (local_except) {
+                    local_except(local_fd, local_ud);
                 }
             }
-            
+
             /* Exceptional data (out-of-band) */
             if (ua->poll_fds[i].revents & POLLPRI) {
-                if (node->except_cbk) {
-                    node->except_cbk(node->fd, node->user_data);
+                if (local_except) {
+                    local_except(local_fd, local_ud);
                 }
             }
         }