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> > I assumed that whenever a thread runs luaC_collectgarbage it
> > must have the lock already. Isn't that true?
> It appears this way, but in my case, wrapping 
> luaC_collectgarbage() in the lua_lock()/lua_unlock() combo 
> makes most crashes go away.
> > > Ideas?  Anyone?
> > 
> > Do you have GC tag methods? Lua releases the lock to call
> > them. Maybe there is something wrong with that?
> I have a nil GC tag method that has a single line in it:
> lua_setgcthreshold(state, 1000000);

I cut the garbage collection tag method (for testing purposes), and the
results are no different... Random crashes accessing Lua information...