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From: John Baldwin <jhb@freebsd.org>
To: Kim Culhan <w8hdkim@gmail.com>
Date: Mon, 1 Oct 2012 09:49:08 -0400
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	(bigwig.baldwin.cx); Mon, 01 Oct 2012 10:55:06 -0400 (EDT)
Cc: freebsd-current@freebsd.org
Subject: Re: panic possibly on on bridge member removal
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On Monday, October 01, 2012 9:08:30 am Kim Culhan wrote:
> On Mon, Oct 1, 2012 at 8:04 AM, John Baldwin <jhb@freebsd.org> wrote:
> > On Saturday, September 29, 2012 8:40:03 am Kim Culhan wrote:
> >> After a few hours of operation involving tap0 added to the bridge
> >> running openvpn
> >> and shutting down openvpn which removes tap0 from the bridge, the
> >> machine is found to have a panic:
> >>
> >> Fatal trap 12: page fault while in kernel mode
> >> cpuid = 1; apic id = 01
> >> fault virtual address   = 0x188
> >> fault code              = supervisor read data, page not present
> >> instruction pointer     = 0x20:0xffffffff82a14f96
> >> stack pointer           = 0x28:0xffffff8000285670
> >> frame pointer           = 0x28:0xffffff80002856b0
> >> code segment            = base 0x0, limit 0xfffff, type 0x1b
> >>                         = DPL 0, pres 1, long 1, def32 0, gran 1
> >> processor eflags        = interrupt enabled, resume, IOPL = 0
> >> current process         = 12 (swi5: fast taskq)
> >> [ thread pid 12 tid 100022 ]
> >> Stopped at      bridge_enqueue+0x86:    calll   *0x188(%r12)
> >> db> bt
> >> Tracing pid 12 tid 100022 td 0xfffffe0003aff000
> >> bridge_enqueue() at bridge_enqueue+0x86
> >
> > Can you run 'gdb /boot/kernel/kernel' and do 'l *bridge_enqueue+0x86'?
> >
> > --
> > John Baldwin
> 
> (gdb) l *bridge_enqueue+0x86
> No symbol "bridge_enqueue" in current context.
> (gdb)

Oh, are you using if_bridge.ko as a module?  If so, you can try running 'gdb 
/boot/kernel/if_bridge.ko' instead.

-- 
John Baldwin