Re: 6.0-BETA2 DRM/witness panic: Assertion j < 1000 failed at /usr/src/sys/kern/subr_witness.c:1513

On Thu, 2005-09-29 at 17:24 +0100, Gavin Atkinson wrote:
> On Thu, 2005-09-29 at 12:10 -0400, John Baldwin wrote:
> > On Tuesday 09 August 2005 12:02 pm, Gavin Atkinson wrote:
> > > On Tue, 2005-08-09 at 10:50 -0400, John Baldwin wrote:
> > > > On Tuesday 09 August 2005 07:57 am, Gavin Atkinson wrote:
> > > > > Hi,
> > > > >
> > > > > I have a regular panic (3 times a day) on a system running 6.0-BETA2
> > > > > which was very stable under 5.4. dmesg available at
> > > > > http://www.devrandom.co.uk/freebsd/dmesg-buffy-20050809 . The panic
> > > > > seems to relate to DRM, I have a ATI Radeon QY RV100 7000/VE card.
> > > >
> > > > Do a 'show witness', it looks like witness has a cycle somehow.  Normally
> > > > these can only occur if there is a cycle in the static lock order.
> > >
> > > http://www.devrandom.co.uk/freebsd/sh-witness-buffy-20050809
> > >
> > > Gavin
> > 
> > Do you still get this panic on more recent 6.0?
> 
> I do with BETA3 from Sept 6th.  I'll update again (after re-adding
> WITNESS etc to GENERIC) and test it again. 

I should have said that I also stepped back in time several times, and
was still getting the panic with kernel from sources dated April 15th,
ruling out the major DRM upgrade in July.  I couldn't get any of the
screensavers that easily provoke the panic to run on a pre-April 15th
system, even after recompiling all ports.

Gavin