The cache is mmap()ed, it becomes part of the programs memory space.
Such crashes happen very very very very very very very very rarely. They
can only happen if the cache was not completely written, i.e. power loss
during update, filesystem bug, hardware bug. Sometimes, they might be
caused by apt issues, but that's probably less than 0.01% of the cases.

Adding the extra checks is a matter of minutes, but it might take some
months until we do this, as they require an ABI break.

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https://bugs.launchpad.net/bugs/16467

Title:
  [MASTER] aptitude/apt-get segmentation fault on currupted cache

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