[Bug 279653] Page fault in in6_selecthlim

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279653

Zhenlei Huang <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #1 from Zhenlei Huang <[email protected]> ---
(In reply to Daniel Ponte from comment #0)
The stack trace is weird. The caller `sys/netinet/tcp_output.c`
```
1444                 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
```

The callee, `sys/netinet6/in6_src.c`:

```
843 int
844 in6_selecthlim(struct inpcb *inp, struct ifnet *ifp)
845 {
846 
847         if (inp && inp->in6p_hops >= 0)
848                 return (inp->in6p_hops);
849         else if (ifp)
850                 return (ND_IFINFO(ifp)->chlim);
851         else if (inp && !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
..
    }
```

The line 850 of should never hit as `ifp` is NULL, the backtrace also shows
that clearly.

That is quite odd ... Is it possible that kgdb report the wrong line number ?

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