Date: Thu, 23 Apr 2009 14:31:11 +0200 From: Gustau Perez <gperez@entel.upc.edu> To: Hans Petter Selasky <hselasky@c2i.net> Cc: usb@freebsd.org, wsk <wsk@gddsn.org.cn>, current@freebsd.org, freebsd-usb@freebsd.org Subject: Re: boot panic on current(04.20) Message-ID: <49F05F8F.5000407@entel.upc.edu> In-Reply-To: <200904212123.14016.hselasky@c2i.net> References: <49ED3E7D.8080606@gddsn.org.cn> <200904212123.14016.hselasky@c2i.net>
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Hans Petter Selasky wrote:
> 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?
>
>
I'm trying to get the dump saved to /var/crash but seems it is not
working. As the crash happens before /etc/rc.d/dumpon executes, dumpon
doesn't get executed,so dumpdev doesn't point to the place where to save
the dump.
I tried booting single user without loading both uhci and ehci. I
booted fined. I tried launching swapon /dev/ad4s3b and /etc/rc.d/dumpon
start. Looking at /dev/dumpdev it points to /dev/ad4s3b, fine. Compiled
the kernel with ;
# Debugging for use in -current
options KDB # Enable kernel debugger support.
options DDB # Support DDB.
and changed sysctl kern.coredump=1.
Loading uchi throws me to the debugger (ok, that's what I wanted),
but the core is not saved to /dev/ad4s3b. Is there something I'm doing
wrong ? Am I missing something ?
> Is the panic reproducible?
>
Yes it is. When uhci.ko is loaded is panics.
> --HPS
>
Regards,
Gus
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