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Re: BUG: 2.3.35 SMP tcpdump crash

from [kuznet] [Permanent Link][Original]
To: rusty@xxxxxxxxxxxxxxxx (Rusty Russell)
Subject: Re: BUG: 2.3.35 SMP tcpdump crash
From: kuznet@xxxxxxxxxxxxx
Date: Thu, 30 Dec 1999 20:14:31 +0300 (MSK)
Cc: netdev@xxxxxxxxxxx
In-reply-to: <m123dFB-000Dt4C@gargle.linuxcare.com.au> from "Rusty Russell" at Dec 30, 99 02:13:02 pm
Sender: owner-netdev@xxxxxxxxxxx 
Hello!

> Only occurs on SMP when tcpdumping forwarded packets.  Completely
> repeatable on stock 2.3.35.

For me it occured the first boot without any tcpdump.

> Looks like skb->head is bogus on freed skb.  This makes me wonder about
> the af_packet skb `borrowing' code...

Look at new skb_expand etc., backing out this fixes the problem.

Alexey
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