Panic, 'giant not owned' kern_mutex.c:299

[Peter Grehan]

>> This is the exact same thing I ran into on ia64. The problem appears
>> to be the default setting of the debug.mpsafevm tunable. If you set
>> it to 1 in the loader the problem is resolved, although you might
>> run into other issues. grehan@ is onto it, so you can also wait for
>> his commit and/or suggestion.
> 
> Thanks for the quick reply.  I think I'll wait for an official fix,
> just to be on the safe side.  Seems a little odd that this 'mpsafe'
> issues would be popping up on a single-CPU system...

  I'm running a buildworld to see if inverting mpsafevm is OK.

  A pre-emptive UP kernel is isn't too far different from an MP system - 
it's still prone to locking issues and race conditions.

  BTW, should be getting the mini shortly !

later,

Peter.