Date: Sun, 2 Jun 1996 12:41:17 +0000 () From: Ade Barkah <mbarkah@hemi.com> To: dennis@etinc.com (Dennis) Cc: hackers@freebsd.org, freebsd-isp@freebsd.org Subject: Re: Nasty Routing BUG in 2.1R Message-ID: <199606021241.MAA00954@hemi.com> In-Reply-To: <199606011534.LAA00235@etinc.com> from "Dennis" at Jun 1, 96 11:34:15 am
next in thread | previous in thread | raw e-mail | index | archive | help
Dennis wrote:
> route delete 200.11.1.17
>
> /* This causes a panic in the function rtfree(). If you dont delete
> the route then the host address is unreachable (you get an arpresolve
> error). */
We've hit this bug (or a variation of it) three times in the past
week (see my previous message to -hackers.)
Our setup looks as follows:
---------------- --------------
| FreeBSD 2.1R | <-- Ethernet --> | Cisco .254 |
---------------- --------------
| <--- PPP connection
------------
| PPP/.252 |
------------
The .252 machine is linked via PPP to the Cisco. It also has its own
/26 subnet. For some reason, the .252 machine (a Telebit router)
doesn't respond to ping x.x.x.252, but it does respond to pings to
IP addresses on its own subnet. Probably a configuration problem at
the Telebit end.
To crash the FreeBSD system, simply type 'ping x.x.x.252', which
generates "/kernel: arpresolve: can't allocate llinfo". I think at
this time it also generates an invalid/incomplete routing entry.
Sometime later the system tries to purge this entry, and we get
panic:rtfree.
The bug is quite disturbing since any user can make the system
unstable by simply issuing 'ping x.252'.
So I set a dumpdev for good measure. Unfortunately, when the
machine panicked again, something happened during the subsequent
savecore which totally messed up the root partition. (Yippe, that
was 4 hours of sweat and panic, trying to patch it back together
with customers complaining.)
Regards,
-Ade
-------------------------------------------------------------------
Inet: mbarkah@hemi.com - HEMISPHERE ONLINE - <http://www.hemi.com/>;
-------------------------------------------------------------------
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199606021241.MAA00954>