> 
> The floppy version of tar dies with a seg fault in bzero.
> 
> Either omitting -lgnumalloc or -N will make it work.

obreak(2) gets confused over OMAGIC executables. It even unmaps pages
when asked to extend the break under anomalous conditions.

It looks like exec_aout.c should be more careful and see to it that the
not unreasonable invariant

	"vm_tsize + vm_dsize == # pages mapped for text/data"

(excluding stack and explicitly mmap()ed pages) is maintained.

-pk

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