From 34331d7beed7576acfc98e991c39738b96162499 Mon Sep 17 00:00:00 2001 From: zhangjian Date: Thu, 19 Jun 2025 09:18:29 +0800 Subject: [PATCH] smb: client: fix first command failure during re-negotiation after fabc4ed200f9, server_unresponsive add a condition to check whether client need to reconnect depending on server->lstrp. When client failed to reconnect for some time and abort connection, server->lstrp is updated for the last time. In the following scene, server->lstrp is too old. This cause next command failure in re-negotiation rather than waiting for re-negotiation done. 1. mount -t cifs -o username=Everyone,echo_internal=10 //$server_ip/export /mnt 2. ssh $server_ip "echo b > /proc/sysrq-trigger &" 3. ls /mnt 4. sleep 21s 5. ssh $server_ip "service firewalld stop" 6. ls # return EHOSTDOWN If the interval between 5 and 6 is too small, 6 may trigger sending negotiation request. Before backgrounding cifsd thread try to receive negotiation response from server in cifs_readv_from_socket, server_unresponsive may trigger cifs_reconnect which cause 6 to be failed: ls thread ---------------- smb2_negotiate server->tcpStatus = CifsInNegotiate compound_send_recv wait_for_compound_request cifsd thread ---------------- cifs_readv_from_socket server_unresponsive server->tcpStatus == CifsInNegotiate && jiffies > server->lstrp + 20s cifs_reconnect cifs_abort_connection: mid_state = MID_RETRY_NEEDED ls thread ---------------- cifs_sync_mid_result return EAGAIN smb2_negotiate return EHOSTDOWN Though server->lstrp means last server response time, it is updated in cifs_abort_connection and cifs_get_tcp_session. We can also update server->lstrp before switching into CifsInNegotiate state to avoid failure in 6. Fixes: 7ccc1465465d ("smb: client: fix hang in wait_for_response() for negproto") Acked-by: Paulo Alcantara (Red Hat) Acked-by: Meetakshi Setiya Signed-off-by: zhangjian Signed-off-by: Steve French --- fs/smb/client/connect.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c index c4fb80b37738d..c48869c29e154 100644 --- a/fs/smb/client/connect.c +++ b/fs/smb/client/connect.c @@ -4199,6 +4199,7 @@ retry: return 0; } + server->lstrp = jiffies; server->tcpStatus = CifsInNegotiate; spin_unlock(&server->srv_lock); -- 2.50.1