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Date:      20 Dec 2001 11:15:45 -0000
From:      Yusuf Goolamabbas <yusufg@outblaze.com>
To:        freebsd-net@freebsd.org, freebsd-stable@freebsd.org
Cc:        cez@pkl.net
Subject:   4.4-stable kernel panic with dummynet/bridging. Same rules work fine with 4.3-RC
Message-ID:  <20011220111545.3327.qmail@yusufg.portal2.com>

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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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