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Date: Thu, 07 Aug 2008 19:32:28 -0700
From: Julian Elischer <julian@elischer.org>
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To: Jeff Mo <mo0118@gmail.com>
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Cc: freebsd-net@FreeBSD.org, damien.saucez@uclouvain.be
Subject: Re: Question about "kern/125239: [gre] kernel crash when using gre"
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Jeff Mo wrote:
> Hi Sir,
> 
> I am trying to dive deeper into the stack frames of  the following bug:
> kern/125239: [gre] kernel crash when using greI use FreeBSD 7.0 and already
> reproduce it, but I am not sure about what the following sentence means:
> "ifp=Variable "ifp" is not available"?
> 
> I will be very thankful if anyone can give me some instruction.
> 
> Regards
> Jeff
> 
> ==================
> 
> (kgdb) f 7
> #7  0xc082263b in in_ifinit (ccc.
> ) at /usr/src/sys/netinet/in.c:817
> 817                     if (rtinitflags(ia)) {
> (kgdb) info f
> Stack level 7, frame at 0xd22f3b58:
>  eip = 0xc082263b in in_ifinit (/usr/src/sys/netinet/in.c:817);
>     saved eip 0xc0823607
>  called by frame at 0xd22f3bb8, caller of frame at 0xd22f3ad4
>  source language c.
>  Arglist at 0xd22f3b50, args: ifp=Variable "ifp" is not available.

ifp was in a register and is no longer valid at this point.

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