Re: dtrace + fbt provider

[Darran Hunt <darran%netbsd.org@localhost>]

On 25/03/2010, at 9:01 AM, Stathis Kamperis wrote:

> > > Hey Darran; first million thanks for your work on porting DTrace :)
> > >
> > > Second, I can update the wiki page, don't waste time on such mundane
> > > tasks.
> > >
> > > Third, I get a 100% reproducible kernel panic, every time I use an  
> > > fbt
> > > entry point.
> > > http://leaf.dragonflybsd.org/~beket/dtrace.png
> > >
> > > It doesn't matter which function I hook into, the system will crash
> > > instantaneously.
> > > Unfortunately, I don't have a swap partition (epic fail), so I can't
> > > set up a dump device and provide you a core.
> > >
> > > Mind that netbsd is running as virtualbox guest in an opensolaris  
> > > host.
> > >
> > > Again, thanks for your work.
> > >
> > > Best regards,
> > > Stathis
> >
> > Hi Stathis,
> >
> > thanks for trying this out!
> >
> > After a second look at the crash you have I think it is definitely  
> > a bug I
> > have detecting that there is no CTF section available for the  
> > kernel.  This
> > happens if your /boot (secondary boot) file has not been updated.   
> > If you
> > copy in a new boot from <dest>/i386/usr/mdec/boot to your root  
> > filesystem
> > this should fix the crash.  I'll work on better detecting the  
> > problem and
> > handling it without a crash.
> >
> > Best regards,
> > Darran.
>
> Hi Darran,
>
> thanks for taking time to comment/bother.
>
> Unfortunately, I can still reproduce the panic. I did a cvs update
> -dPA, build/install'ed kernel & distrubution sets, copied /boot file
> from usr/mdec/boot to /boot.
> I did it twice, but I'll give it another try in case I missed  
> something.
>
>
> Cheers,
> Stathis

Can you send me the output of readelf -S /netbsd?  I'd like to verify  
that you have .SUNW_ctf section as the last section.

Cheers,
Darran.