netdev - Re: Asterisk deadlocks since Kernel 4.1

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Message-ID: <56653832.2030607@pmhahn.de>
Date:	Mon, 7 Dec 2015 08:41:38 +0100
From:	Philipp Hahn <pmhahn@...ahn.de>
To:	Stefan Priebe <s.priebe@...fihost.ag>,
	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Florian Weimer <fweimer@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, netdev@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	jannik Winkel <j.winkel@...fihost.ag>,
	Marco Schinkel <m.schinkel@...fihost.ag>
Subject: Re: Asterisk deadlocks since Kernel 4.1

Hello Stefan,

Am 06.12.2015 um 21:56 schrieb Stefan Priebe:
> i think i found the issue in 4.1 with netlink. Somebody made a mistake
> while backporting or cherry-picking your patch "netlink: Fix autobind
> race condition that leads to zero port ID" to 4.1.
> 
> It misses a goto in 4.1.
> 
> This goto is missing in 4.1:
> 
> diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
> index 4017e12..f15c001 100644
> --- a/net/netlink/af_netlink.c
> +++ b/net/netlink/af_netlink.c
> @@ -1132,7 +1132,6 @@ static int netlink_insert(struct sock *sk, u32
> portid)
>                 if (err == -EEXIST)
>                         err = -EADDRINUSE;
>                 sock_put(sk);
> -               goto err;
>         }
> 
>         /* We need to ensure that the socket is hashed and visible. */
> 
> Can you please confirm, that this is not correct and might cause those
> issues.

I just tested that patch and it seems to fix our hang. Thank you for
your good work.

Philipp

PS: I guess I can skip testing your other test request as this simple
patch is part of your other hiuq4bsW patch. If I should still test it,
just send a note.
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