Date: Thu, 20 Dec 2001 12:48:59 -0800 From: Luigi Rizzo <rizzo@aciri.org> To: Yusuf Goolamabbas <yusufg@outblaze.com> Cc: freebsd-net@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG, cez@pkl.net Subject: Re: 4.4-stable kernel panic with dummynet/bridging. Same rules work fine with 4.3-RC Message-ID: <20011220124859.A8969@iguana.aciri.org> In-Reply-To: <20011220111545.3327.qmail@yusufg.portal2.com> References: <20011220111545.3327.qmail@yusufg.portal2.com>
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I wonder if this isn't related to some change in the handling of
interface lists, routes or arp entries. I do not recall any recent
change in the dummynet/bridge code that might cause this.
On passing. the line ${fwcmd} add 400 pass udp from 0.0.0.0 2054 to 0.0.0.0
has not been supported for a long time.
How repeatable is the problem ? It shouldn't be hard to track, it looks
like a null pointer dereference.
cheers
luigi
On Thu, Dec 20, 2001 at 11:15:45AM -0000, Yusuf Goolamabbas wrote:
> Hi, Similar to what Ceri describes in this message
>
> http://docs.freebsd.org/cgi/getmsg.cgi?fetch=508422+0+current/freebsd-stable
>
> I have observed a 4.4-stable box panicing whenever bridging is turned
> on. This was cvsup'ed today morning. I have other boxes cvsup'ed at
> the same time except that they don't have dummynet/bridging configured
> in them and they work pretty well
>
> I replaced the box with an another 4.3-RC box and the same rules
> enclosed here work just fine
>
> ${fwcmd} add 100 pass all from any to any via lo0
> ${fwcmd} add 200 deny all from any to 127.0.0.0/8
> ${fwcmd} add 300 deny ip from 127.0.0.0/8 to any
> # If you're using 'options BRIDGE', uncomment the following line to pass ARP
> ${fwcmd} add 400 pass udp from 0.0.0.0 2054 to 0.0.0.0
> ${fwcmd} add 500 pass all from <ip_range> to any in via fxp0
> ${fwcmd} add 800 pipe 1 ip from <ip_range> to any in via fxp1
> ${fwcmd} pipe 1 config mask src-ip 0x000000ff bw 512Kbit/s queue 50
>
> Basically, fxp1 is connected to a switch and every machine on that
> switch is rate limited to 512Kbit/s individually
>
> I had configured the box with DDB but didn't have serial console so I
> transcribed everything at the db> prompt
>
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0xa4
> fault code = superviser read, page not present
> instruction pointer = 0x8:0xc0199164
> strack pointer = 0x10:0xc9889b5c
> frame pointer = 0x10:0xc9889bac
> code segment = base 0x0, limit 0xfff type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 55 (sh)
> interrupt mask =
> kernel: type 12 trap, code = 0
> stopped at in_arpinput+0x158; movl 0xa4(%eax,%eax)
>
> db> t
> in_arpinput(c077cb00,0,c989cac,c020d625,c020d5df) at in_arpinput+0x158
> arpintr(c020dfdf,0,c02800,0,c7640010,c0e700,0) at arpintr+0x112
> swi_net_next(c028c26c,c764f000,3,0,c835c440) at swi_net_next
> trap_pfault(c9889d20,0,c764f000,0,806c591) at trap_pfault+0xbe
> trap(10,c9880010,c01d0010,c764f000,80be591_ at trap+0x31f
> calltrap() at calltrap+0x11
> trap 0xc : eip - 0xc02172cf , esp - 0xc9889d60, ebp - 0xc9889d88
> copyinstr(c9889e68,0,0,c9889f80,c9889f80) at copyinstr+0x37
> exec_elf_imagact(c9889e68,c835c440,3,c9889f80,c9889e68) at exec_elf_imagact+0xba
> execve(c835c440,c9889f80,80be5d4,0,80be590) at execve+0x26c
> syscall2(2f,2f,2f,80be590,0) at syscall2+0x1a5
> Xinit0x80_syscall() + Xint-x80_syscall+0x25
>
> Hope this helps
>
> Regards, Yusuf
>
> --
> Yusuf Goolamabbas
> yusufg@outblaze.com
>
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