Re: debugging xen networking scripts

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Aug 26, 2008 at 12:41:08PM +0100, Brad Pitney wrote:
> On Tue, Aug 26, 2008 at 11:15 AM, Manuel Bouyer 
> <bouyer%antioche.eu.org@localhost> wrote:
> >
> > What is the panic message ? Maybe freebsd/Xen is using a Xen feature which 
> > is
> > not implemented in NetBSD ?
> >
> 
> Trying to mount root from ufs:/dev/xbd0s1a
> 
> Manual root filesystem specification:
>  <fstype>:<device>  Mount <device> using filesystem <fstype>
>                       eg. ufs:da0s1a
>  ?                  List valid disk boot devices
>  <empty line>       Abort manual input
> 
> mountroot> ?
> 
> List of GEOM managed disk devices:
>  xbd1cs1d xbd1cs1c xbd1cs1a xbd1cs1 xbd1s1d xbd1s1c xbd1s1a xbd1c
> xbd1a xbd1s1 xbd3 xbd2 xbd1
> 
> Manual root filesystem specification:
>  <fstype>:<device>  Mount <device> using filesystem <fstype>
>                       eg. ufs:da0s1a
>  ?                  List valid disk boot devices
>  <empty line>       Abort manual input
> 
> mountroot> ufs:xbd1s1a
> Trying to mount root from ufs:xbd1s1a
> panic: vm_fault: fault on nofault entry, addr: c0877000
> cpuid = 0
> KDB: enter: panic
> [thread pid 12 tid 100024 ]
> Stopped at      kdb_enter+0x3a: movl    $0,kdb_why
> db> bt
> Tracing pid 12 tid 100024 td 0xc16a8cc0
> kdb_enter(c0340eed,c0340eed,c0360502,cbe448ec,0,...) at kdb_enter+0x3a
> panic(c0360502,c0877000,1,cbe44a0c,cbe449fc,...) at panic+0x12c
> vm_fault(c0871000,c0877000,1,0,c0877fd0,...) at vm_fault+0x178
> dblfault_handler() at dblfault_handler+0x551
> --- trap 0x17, eip = 0, esp = 0, ebp = 0 ---
> db>
> 
> but it only happens when I have a vif = ['mac=,...'] section
> configured with a vif = [] it boots fine.
> 
> I'm currently setting up a Linux Dom0 then I will do a completely
> fresh NetBSD Dom0

You'll also have to ask on a FreeBSD ml what the above panic means,
and how to interpret it.
It doesn't gives much info; I would have expected to see a xennet function
is the trace.
Also, do the freebsd boot show a network interface ? What is there in the
NetBSD dmesg about this domU ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--