From owner-freebsd-usb@FreeBSD.ORG  Tue Apr 21 19:20:44 2009
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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-usb@freebsd.org
Date: Tue, 21 Apr 2009 21:23:12 +0200
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Cc: usb@freebsd.org, current@freebsd.org, wsk <wsk@gddsn.org.cn>
Subject: Re: boot panic on current(04.20)
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On Tuesday 21 April 2009, wsk wrote:
> lists
>   boot panic on current(2009.04.20).it seems caused by usbus4
>
> Root mount waiting for: usbus4
> uhub4: 8 ports with 8 removable, self powered
> Root mount waiting for: usbus4
> ugen4.2: <NEC> at usbus4
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0x0
> fault code              = supervisor read, page not present
> instruction pointer     = 0x20:0xc08ed3a3
> stack pointer           = 0x28:0xe4c38b40
> frame pointer           = 0x28:0xe4c38b44
> 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         = 28 (usbus4)
> trap number             = 12
> panic: page fault
> cpuid = 0
> uptime: 5s
> Cannot dump. Device not defined or unavailable.
>

Can you compile a kernel with debugging and get a backtrace?

Is the panic reproducible?

--HPS