netdev - Re: [PATCH net] rxrpc: Fix lack of conn cleanup when local endpoint is cleaned up [ver #2]

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Date:   Fri, 30 Aug 2019 15:07:09 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     dhowells@...hat.com
Cc:     netdev@...r.kernel.org, marc.dionne@...istor.com,
        linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] rxrpc: Fix lack of conn cleanup when local
 endpoint is cleaned up [ver #2]

From: David Howells <dhowells@...hat.com>
Date: Thu, 29 Aug 2019 14:12:11 +0100

> When a local endpoint is ceases to be in use, such as when the kafs module
> is unloaded, the kernel will emit an assertion failure if there are any
> outstanding client connections:
> 
> 	rxrpc: Assertion failed
> 	------------[ cut here ]------------
> 	kernel BUG at net/rxrpc/local_object.c:433!
> 
> and even beyond that, will evince other oopses if there are service
> connections still present.
> 
> Fix this by:
 ...
> Only after destroying the connections can we close the socket lest we get
> an oops in a workqueue that's looking at a connection or a peer.
> 
> Fixes: 3d18cbb7fd0c ("rxrpc: Fix conn expiry timers")
> Signed-off-by: David Howells <dhowells@...hat.com>
> Tested-by: Marc Dionne <marc.dionne@...istor.com>

Applied.