netdev - Re: Fw: [Bug 99091] New: Kernel panic while sending network packets over TAP interface

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Message-ID: <20150529030143.GA16290@gondor.apana.org.au>
Date:	Fri, 29 May 2015 11:01:44 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	netdev@...r.kernel.org
Subject: Re: Fw: [Bug 99091] New: Kernel panic while sending network packets
 over TAP interface

Stephen Hemminger <stephen@...workplumber.org> wrote:
>
> Our setup is designed specifically to cause the calling path "bridge transmit"
> - "VLAN transmit" - "bridge transmit" - "GRE or TAP transmit" as reflected by
> the crash dump. It appears that this sequence hits a race condition or a
> corrupted/uninitialized error queue in skb_queue_tail().

Your bug is simple.  Somebody is setting skb->sk when they shouldn't.
Presumably it's whatever that injected the packet into your stack,
i.e., your NIC driver.  So you should start looking for blame there.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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