Tested on apt-1.0.1ubuntu2.20 from trusty-proposed. Tried reproducing
according to the test case from description, and verified that apt-cache
does not crash:

ubuntu@apt-stress:~/stress-ng$ dpkg -l | grep apt
ii  apt                                     1.0.1ubuntu2.20

(while having stress-ng running)
ubuntu@apt-stress:~/stress-ng$ for i in `seq 1 10000`;do apt-cache policy 
vsftpd;done
E: Couldn't make mmap of 30021560 bytes - MMap-mmap (12: Cannot allocate memory)
E: The package lists or status file could not be parsed or opened.

** Tags removed: verification-needed verification-needed-trusty
** Tags added: verification-done-trusty

** Tags added: verification-needed

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https://bugs.launchpad.net/bugs/1815129

Title:
  apt segfaults when generating cache file

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