Bug#535218: apt-get / aptitude segfault when Cache-Limit is too small

[Steve Cotton <steve0001@s.cotton.clara.co.uk>]

package apt
severity 535218 important
merge 295051 535218
thanks

> That is no solution. libapt should never ever ever ever
> segfault.

JackYF wrote a patch that completely replaces the Dynamic MMap
code (it's discussed in #474947).

That is likely to make this segfault unreproducible.  It's not a
fix to this bug; but it seems this bug only triggers after the Dynamic
MMap bug has already broken apt.
(I'm guessing that the Dynamic MMap bug is creating a structure
with null pointers, and other code isn't ready for that.)

Steve