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smb: client: fix race condition in negotiate timeout by using more precise timing 

[ Upstream commit 266b5d02e14f3a0e07414e11f239397de0577a1d ]

When the SMB server reboots and the client immediately accesses the mount
point, a race condition can occur that causes operations to fail with
"Host is down" error.

Reproduction steps:
  # Mount SMB share
  mount -t cifs //192.168.245.109/TEST /mnt/ -o xxxx
  ls /mnt

  # Reboot server
  ssh root@192.168.245.109 reboot
  ssh root@192.168.245.109 /path/to/cifs_server_setup.sh
  ssh root@192.168.245.109 systemctl stop firewalld

  # Immediate access fails
  ls /mnt
  ls: cannot access '/mnt': Host is down

  # But works if there is a delay

The issue is caused by a race condition between negotiate and reconnect.
The 20-second negotiate timeout mechanism can interfere with the normal
recovery process when both are triggered simultaneously.

  ls                              cifsd
---------------------------------------------------
 cifs_getattr
 cifs_revalidate_dentry
 cifs_get_inode_info
 cifs_get_fattr
 smb2_query_path_info
 smb2_compound_op
 SMB2_open_init
 smb2_reconnect
 cifs_negotiate_protocol
  smb2_negotiate
   cifs_send_recv
    smb_send_rqst
    wait_for_response
                            cifs_demultiplex_thread
                              cifs_read_from_socket
                              cifs_readv_from_socket
                                server_unresponsive
                                cifs_reconnect
                                  __cifs_reconnect
                                  cifs_abort_connection
                                    mid->mid_state = MID_RETRY_NEEDED
                                    cifs_wake_up_task
    cifs_sync_mid_result
     // case MID_RETRY_NEEDED
     rc = -EAGAIN;
   // In smb2_negotiate()
   rc = -EHOSTDOWN;

The server_unresponsive() timeout triggers cifs_reconnect(), which aborts
ongoing mid requests and causes the ls command to receive -EAGAIN, leading
to -EHOSTDOWN.

Fix this by introducing a dedicated `neg_start` field to
precisely tracks when the negotiate process begins. The timeout check
now uses this accurate timestamp instead of `lstrp`, ensuring that:

1. Timeout is only triggered after negotiate has actually run for 20s
2. The mechanism doesn't interfere with concurrent recovery processes
3. Uninitialized timestamps (value 0) don't trigger false timeouts

Fixes: 7ccc146546 ("smb: client: fix hang in wait_for_response() for negproto")
Signed-off-by: Wang Zhaolong <wangzhaolong@huaweicloud.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit ca7d5aa7ccf0af1a40d56ed2df05ed17ed0ce5d3)
This commit is contained in:
Wang Zhaolong 2025-07-03 21:29:52 +08:00 committed by Wentao Guan
parent 8958625667
commit 2d37922821
2 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/smb/client/cifsglob.h
View File

@ -743,6 +743,7 @@ struct TCP_Server_Info {
__le32 session_key_id; /* retrieved from negotiate response and send in session setup request */
struct session_key session_key;
unsigned long lstrp; /* when we got last response from this server */
unsigned long neg_start; /* when negotiate started (jiffies) */
struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
#define CIFS_NEGFLAVOR_UNENCAP 1 /* wct == 17, but no ext_sec */
#define CIFS_NEGFLAVOR_EXTENDED 2 /* wct == 17, ext_sec bit set */

7
fs/smb/client/connect.c
View File

@ -677,12 +677,12 @@ server_unresponsive(struct TCP_Server_Info *server)
/*
* If we're in the process of mounting a share or reconnecting a session
* and the server abruptly shut down (e.g. socket wasn't closed, packet
* had been ACK'ed but no SMB response), don't wait longer than 20s to
* negotiate protocol.
* had been ACK'ed but no SMB response), don't wait longer than 20s from
* when negotiate actually started.
*/
spin_lock(&server->srv_lock);
if (server->tcpStatus == CifsInNegotiate &&
time_after(jiffies, server->lstrp + 20 * HZ)) {
time_after(jiffies, server->neg_start + 20 * HZ)) {
spin_unlock(&server->srv_lock);
cifs_reconnect(server, false);
return true;
@ -3998,6 +3998,7 @@ retry:
server->lstrp = jiffies;
server->tcpStatus = CifsInNegotiate;
server->neg_start = jiffies;
spin_unlock(&server->srv_lock);
rc = server->ops->negotiate(xid, ses, server);