Re: boot panic on current(04.20)

On 4/23/09, Gustau Perez <gperez_at_entel.upc.edu> wrote:
> 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 ?

ddb(4)
>
>> Is the panic reproducible?
>>
>
>    Yes it is. When uhci.ko is loaded is panics.
>> --HPS
>>
>
>     Regards,
>
>    Gus
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>
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-- 
Paul