[Freeciv-Dev] Re: (PR#2635) bug in ai air code?

["Mike Kaufman via RT" <rt@xxxxxxxxxxxxxx>]

On Mon, Dec 23, 2002 at 11:34:51AM -0800, Per I. Mathisen via RT wrote:
> 
> 1: IDEX: unit unreg missing: 1627 473a50 Fighter
> > sanitycheck.c:67: failed assertion `plr_tile->seen < 60000'
> 
> 1: IDEX: unit unreg missing: 3243 69f998 Stealth Fighter
> > sanitycheck.c:67: failed assertion `plr_tile->seen < 60000'
> 
> I get these errors in certain very long autogames. I cannot reproduce them
> from a saved savegame. Seems to be always air units that are reported
> missing. I don't see what the two error messages have to do with each
> other, but they always occur simultaneous.

This makes sense. I've been aware of this sort of problem for a while. The
'problem' is that ->seen is unsigned which means if there's a bug somewhere
in refogging a tile (it gets fogged too many times) then we underflow seen
and trip the assert. Hopefully this allows you to track down the problem
code.

-mike