netdev - Re: 2.6.27-rc4: icmp_sk() uses smp_processor

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Date:	Thu, 21 Aug 2008 22:50:00 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	adobriyan@...il.com
Cc:	den@...nvz.org, dlezcano@...ibm.com, netdev@...r.kernel.org
Subject: Re: 2.6.27-rc4: icmp_sk() uses smp_processor_id() in preemptible code

adobriyan@...il.com wrote:
> Steps to reproduce:
> 
>        CONFIG_PREEMPT=y
>        CONFIG_DEBUG_PREEMPT=y
>        tracepath <something>
> 
> icmp6_sk() is similar (I haven't checked at runtime, though).
> 
> BUG: using smp_processor_id() in preemptible [00000000] code: tracepath/3205
> caller is icmp_sk+0x15/0x30
> Pid: 3205, comm: tracepath Not tainted 2.6.27-rc4 #1
> 
> Call Trace:
> [<ffffffff8031af14>] debug_smp_processor_id+0xe4/0xf0
> [<ffffffff80409405>] icmp_sk+0x15/0x30
> [<ffffffff8040a17b>] icmp_send+0x4b/0x3f0

Caused by:

commit 405666db84b984b68fc75794069f424c02e5796c
Author: Denis V. Lunev <den@...nvz.org>
Date:   Fri Feb 29 11:16:46 2008 -0800

    [ICMP]: Pass proper ICMP socket into icmp(v6)_xmit_(un)lock.

We need to disable preemption (was provided by disabling BH) before
getting the per-cpu ICMP socket.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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