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From: Karl Denninger  <karl@Mcs.Net>
Message-Id: <199610102143.QAA13666@Jupiter.Mcs.Net>
Subject: Re: Crash in -current (from the current SNAP)
To: fenner@parc.xerox.com (Bill Fenner)
Date: Thu, 10 Oct 1996 16:43:30 -0500 (CDT)
Cc: fenner@parc.xerox.com, karl@Mcs.Net, current@freebsd.org,
        hackers@freebsd.org
In-Reply-To: <96Oct10.144023pdt.177476@crevenia.parc.xerox.com> from "Bill Fenner" at Oct 10, 96 02:40:12 pm
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> 
> >(kgdb) 
> >(kgdb) select-frame 14
> >(kgdb) print ip_protox[ip->ip_p]
> >$1 = 2 '\002'
> >
> >That's "INET", if I'm reading the headers correctly.
> 
> No, it's "TCP" (ip_protox[] is an offset into the inetsw[], and inetsw[2]
> is TCP).
> 
> >(kgdb) print inetsw[ip_protox[ip->ip_p]].pr_input 
> >$2 = (void (*)()) 0xf01477ec <tcp_input>
> 
> Looks fine.  Perhaps the trap didn't actually happen in ip_input?
> Try "select-frame 12" and then "frame frame->tf_ebp frame->tf_eip",
> which should tell you where the crash really happened.
> 
>   Bill

Oh oh....
(kgdb) select-frame 12
(kgdb) frame frame->tf_ebp frame->tf_eip
#0  0xf0147ae5 in tcp_input (m=0xf2782900, iphlen=20)
    at ../../netinet/tcp_input.c:438
    ../../netinet/tcp_input.c:438: No such file or directory.

Which is....
                        inp = (struct inpcb *)so->so_pcb;
>>>>>>>                 inp->inp_laddr = ti->ti_dst; 
                        inp->inp_lport = ti->ti_dport;  
                        in_pcbrehash(inp);

Right in the middle of the "dropsocket" area.

Me smells a problem with the SYN flood patch.

--
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