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Date:   Tue, 09 Aug 2022 04:00:14 +0000
To:     Martin Schiller <>
Subject: Re: [PATCH net] net/x25: fix call timeouts in blocking connects


This patch was applied to netdev/net.git (master)
by Jakub Kicinski <>:

On Fri,  5 Aug 2022 08:18:10 +0200 you wrote:
> When a userspace application starts a blocking connect(), a CALL REQUEST
> is sent, the t21 timer is started and the connect is waiting in
> x25_wait_for_connection_establishment(). If then for some reason the t21
> timer expires before any reaction on the assigned logical channel (e.g.
> CALL ACCEPT, CLEAR REQUEST), there is sent a CLEAR REQUEST and timer
> t23 is started waiting for a CLEAR confirmation. If we now receive a
> CLEAR CONFIRMATION from the peer, x25_disconnect() is called in
> x25_state2_machine() with reason "0", which means "normal" call
> clearing. This is ok, but the parameter "reason" is used as sk->sk_err
> in x25_disconnect() and sock_error(sk) is evaluated in
> x25_wait_for_connection_establishment() to check if the call is still
> pending. As "0" is not rated as an error, the connect will stuck here
> forever.
> [...]

Here is the summary with links:
  - [net] net/x25: fix call timeouts in blocking connects

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