netdev - Re: Asterisk deadlocks since Kernel 4.1

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Message-ID: <56652E11.4010604@profihost.ag>
Date:	Mon, 7 Dec 2015 07:58:25 +0100
From:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
To:	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>,
	"David S. Miller" <davem@...emloft.net>, stable@...r.kernel.org
Subject: Re: Asterisk deadlocks since Kernel 4.1

Hi Herbert,

Am 07.12.2015 um 02:20 schrieb Herbert Xu:
> On Sun, Dec 06, 2015 at 09:56:34PM +0100, Stefan Priebe wrote:
>> Hi Herbert,
>>
>> 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.
> 
> Well spotted! Yes this would be a fatal error and can cause the
> problems you guys are seeing.

Thanks, good. Can you help me to get this fix upstream into the stable
lines?

Stefan

> 
> Thanks,
> 
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