Question about "kern/125239: [gre] kernel crash when using gre"

[Julian Elischer]

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ifp was in a register and is no longer valid at this point.

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