boot panic on current(04.20)

[Hans Petter Selasky]

On Thursday 23 April 2009, Gustau Perez 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 ?
>
> > Is the panic reproducible?
>
>    Yes it is. When uhci.ko is loaded is panics.

If you type "bt" in the debugger, what are the USB functions being called?

--HPS