Panic on -CURRENT after LDT changes

Joe Marcus Clarke marcus at marcuscom.com
Thu May 24 16:08:58 UTC 2007


On Thu, 2007-05-24 at 20:13 +0200, Attilio Rao wrote:
> Jeff Roberson wrote:
> > Thanks,  Attilio and I will look at this right away.
> > 
> > Jeff
> > 
> > On Wed, 23 May 2007, Joe Marcus Clarke wrote:
> > 
> >> On a -CURRENT build today with Jeff's LDT locking changes, I get an
> >> instant, reproducible panic by doing:
> >>
> >> # cd /usr/src
> >> # make -DNO_CLEAN buildworld
> >>
> >> Backing out the LDT changes to /sys/i386/i386/*machdep* corrects the
> >> problem.  Here is a dmesg and backtrace.  In frame 6, it appears mdp is
> >> NULL (i.e. td->td_proc->p_md = 0x0).
> 
> Did you enable WITNESS/INVARIANTS/INVARIANT_SUPPORT?

No, this kernel does not have WITNESS or INVARIANTS.  I can enable those
tomorrow if that would give you more useful information.

Joe

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