This is a note to let you know that I've just added the patch titled tipc: increase timeout in tipc_sk_enqueue() to the 4.9-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: tipc-increase-timeout-in-tipc_sk_enqueue.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit b7a8bf9183c69859fd81087995b353af13ee1a12 Author: Hoang Le <hoang.h.le@xxxxxxxxxxxxxx> Date: Mon Sep 13 16:28:52 2021 +0700 tipc: increase timeout in tipc_sk_enqueue() [ Upstream commit f4bb62e64c88c93060c051195d3bbba804e56945 ] In tipc_sk_enqueue() we use hardcoded 2 jiffies to extract socket buffer from generic queue to particular socket. The 2 jiffies is too short in case there are other high priority tasks get CPU cycles for multiple jiffies update. As result, no buffer could be enqueued to particular socket. To solve this, we switch to use constant timeout 20msecs. Then, the function will be expired between 2 jiffies (CONFIG_100HZ) and 20 jiffies (CONFIG_1000HZ). Fixes: c637c1035534 ("tipc: resolve race problem at unicast message reception") Acked-by: Jon Maloy <jmaloy@xxxxxxxxxx> Signed-off-by: Hoang Le <hoang.h.le@xxxxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/tipc/socket.c b/net/tipc/socket.c index 607785077445..9f39276e5d4e 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -1755,7 +1755,7 @@ static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb) static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, u32 dport, struct sk_buff_head *xmitq) { - unsigned long time_limit = jiffies + 2; + unsigned long time_limit = jiffies + usecs_to_jiffies(20000); struct sk_buff *skb; unsigned int lim; atomic_t *dcnt;