Panic on -CURRENT after LDT changes

[Attilio Rao]

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?

Thanks,
Attilio