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From: John Baldwin <jhb@freebsd.org>
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	(bigwig.baldwin.cx); Mon, 01 Oct 2012 08:58:16 -0400 (EDT)
Cc: Kim Culhan <w8hdkim@gmail.com>
Subject: Re: panic possibly on on bridge member removal
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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