From: "=?ISO-8859-2?Q?Pawe=B3_Ma=B3achowski?=" <pawmal@unia.3lo.lublin.pl> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/42030: panic when zebra works on detaching tun interface Message-ID: <20020831111339Z2805811-15527%2B3@mx1.lublin.pl> In-Reply-To: <200208261206.g7QC6Nh8077791@www.freebsd.org>
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On 26 Aug 02, at 5:06, Paweł Małachowski wrote:
> The example vtund.conf section is:
> foo-blah {
> pass xxx;
> device tun10;
> up {
> ifconfig "%% 10.61.7.254 10.61.7.253 netmask 255.255.255.255";
> };
> down {
> ifconfig "%% delete 10.61.7.254";
> };
> }
>
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0x4
> fault code = supervisor read, page not present
> instruction pointer = 0x8:0xc0249839
> stack pointer = 0x10:0xcdf65d1c
> frame pointer = 0x10:0xcdf65d28
> code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 306 (zebra)
> interrupt mask =
> trap number = 12
> panic: page fault
>
> syncing disks... 9 3
> done
> Uptime: 5h7m18s
> #6 0xc0249839 in arp_rtrequest (req=1, rt=0xc1857700, info=0xcdf65d98)
> at ../../netinet/if_ether.c:188
> >How-To-Repeat:
> As above, try to estabilish and disconnect tunnels when Zebra is running on it.
> Note: kernel panic happens only sometimes. But when the panic comes, there is always zebra (not ospfd) process as "current process".
> >Fix:
> Don't know.
I've noted this work-around works for me:
Don't use down {} section in vtund to delete IP assingned to the tun
interface. I've disabled `ifconfig delete' command in down {} section
and no kernel panic related with zebra process occured.
It seems arp_rtrequest() can cause (and does) kernel panic when IP address
was removed from tun interface.
--
Paweł Małachowski, mailto:pawmal#freebsd,lublin,pl
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