This is a note to let you know that I've just added the patch titled
smb: client: fix hang in wait_for_response() for negproto
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
smb-client-fix-hang-in-wait_for_response-for-negprot.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 169dc7d3c37753764a156cbfe06dcc30bdddcbc7
Author: Paulo Alcantara <pc@xxxxxxxxxxxxx>
Date: Sat Aug 31 21:40:28 2024 -0300
smb: client: fix hang in wait_for_response() for negproto
[ Upstream commit 7ccc1465465d78e6411b7bd730d06e7435802b5c ]
Call cifs_reconnect() to wake up processes waiting on negotiate
protocol to handle the case where server abruptly shut down and had no
chance to properly close the socket.
Simple reproducer:
ssh 192.168.2.100 pkill -STOP smbd
mount.cifs //192.168.2.100/test /mnt -o ... [never returns]
Cc: Rickard Andersson <rickaran@xxxxxxxx>
Signed-off-by: Paulo Alcantara (Red Hat) <pc@xxxxxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c
index 21b344762d0f8..87ce71b39b771 100644
--- a/fs/smb/client/connect.c
+++ b/fs/smb/client/connect.c
@@ -673,6 +673,19 @@ allocate_buffers(struct TCP_Server_Info *server)
static bool
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.
+ */
+ spin_lock(&server->srv_lock);
+ if (server->tcpStatus == CifsInNegotiate &&
+ time_after(jiffies, server->lstrp + 20 * HZ)) {
+ spin_unlock(&server->srv_lock);
+ cifs_reconnect(server, false);
+ return true;
+ }
/*
* We need to wait 3 echo intervals to make sure we handle such
* situations right:
@@ -684,7 +697,6 @@ server_unresponsive(struct TCP_Server_Info *server)
* 65s kernel_recvmsg times out, and we see that we haven't gotten
* a response in >60s.
*/
- spin_lock(&server->srv_lock);
if ((server->tcpStatus == CifsGood ||
server->tcpStatus == CifsNeedNegotiate) &&
(!server->ops->can_echo || server->ops->can_echo(server)) &&
