[Bug 1549819] Re: SIGSEGV when reloading cache after setting architecture to ""

[Andreas Hasenack]

Here is a bt full from this reproducer given to me by juliank:
$ cat a.cfg
APT::Architecture "";
$ apt-cache gencaches -c a.cfg  -o Dir::Cache=$PWD -o Debug::NoLocking=1
Reading package lists... Error!
E: The package cache was built for different architectures:  vs i386
W: You may want to run apt-get update to correct these problems
E: The package cache file is corrupted

http://pastebin.ubuntu.com/15197953/

Also attached in case the pastebin gets wiped.

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https://bugs.launchpad.net/bugs/1549819

Title:
  SIGSEGV when reloading cache after setting architecture to ""

Status in apt package in Ubuntu:
  Confirmed
Status in landscape-client package in Ubuntu:
  Confirmed

Bug description:
  When reloading the cache, after setting an architecture, the Python
  process segfaults.

  Simple script to reproduce is at: http://paste.ubuntu.com/15197359/

  Tested on a Xenial LXD with Wily host (on the host, the script doesn't
  trigger the segfault).

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: python-apt 1.1.0~beta1build1
  ProcVersionSignature: Ubuntu 4.2.0-27.32-generic 4.2.8-ckt1
  Uname: Linux 4.2.0-27-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  Date: Thu Feb 25 14:09:39 2016
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: python-apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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