Date: Sun, 14 May 1995 02:58:56 +0200 (MET DST) From: Pierre Beyssac <pb@fasterix.freenix.fr> To: pritc003@maroon.tc.umn.edu (Mike Pritchard) Cc: bugs@FreeBSD.org Subject: Re: -current kernel panics in rtfree Message-ID: <199505140058.CAA02666@fasterix.frmug.fr.net> In-Reply-To: <199505130245.VAA00225@mpp.com> from "Mike Pritchard" at May 12, 95 09:45:44 pm
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Mike Pritchard writes:
[ panic in rtfree during a slip connection ]
Same for me using PPP. Like Mike, I noticed this problem recently.
I run a kernel compiled from friday night -current.
I have a different kernel stack dump, though. My panics seem to
occur during a UDP sendto. Note the recursive call to rtfree.
It seems that the code causing the panic is :
void
rtfree(rt)
register struct rtentry *rt;
{
register struct radix_node_head *rnh =
rt_tables[rt_key(rt)->sa_family];
register struct ifaddr *ifa;
if (rt == 0 || rnh == 0)
panic("rtfree");
Which is recursively called by rtfree() itself at the end of the
subroutine :
if (rt->rt_parent) {
RTFREE(rt->rt_parent);
}
I'll try to identify the problem, if I can.
I'll keep the crash dump(s) :-) in case anybody wishes me to provide
more info.
panic: rtfree
[...]
#1 0xf01105a3 in panic ()
#2 0xf0135eef in rtfree ()
#3 0xf0135f84 in rtfree ()
#4 0xf013efaf in ip_output ()
#5 0xf0144d35 in udp_output ()
#6 0xf0144ff5 in udp_usrreq ()
#7 0xf011d4e2 in sosend ()
#8 0xf011fad3 in sendit ()
#9 0xf011fbb0 in sendto ()
#10 0xf01701fd in syscall ()
#11 0xf016894b in Xsyscall ()
Here are the results of a "netstat -r -n" done during a PPP connection,
in case it might help. I've not been able to extract the same info from
the crash dump with "netstat -r -n -M vmcore" ("kvm_open: cannot read
IdlePTD"), so don't take the following as a strict image of the routes
at the time of the panic. They're likely very close, however.
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 193.55.4.3 UGc 2 0 ppp0
127.0.0.1 127.0.0.1 UH 1 436 lo0
193.55.4.3 193.55.4.149 UH 3 5 ppp0
193.56.58 link#1 UC 0 0
193.56.58.138 0:40:5:12:bd:dd UHLW 1 40 lo0
I have a local ethernet (193.56.58.0) on a NE2000 clone, my local PPP
address is 193.55.4.149 (fasterix.fdn.fr) and the PPP server is 193.55.4.3.
--
Pierre Beyssac pb@fasterix.frmug.fr.net pb@fasterix.fdn.fr
FreeBSD, NetBSD, Linux -- Il y a moins bien, mais c'est plus cher.
You can also get less bang for more bucks. (translation F. Berjon)
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