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I noticed starting yesterday (2015-06-11) that "apt-get update" would
give "segmentation fault" with exit code 139. "apt-get upgrade" would
also segfault with exit code 139.

Trying various things, if I comment out in /etc/apt/sources.lst:
deb http://archive.ubuntu.com/ubuntu precise-backports main restricted universe multiverse
... "apt-get update" then works normally and "upgrade" will upgrade new package revisions.
If I add back the backports line and "apt-get update", the segfaults will start happening again.

This only happens on my 12.04 LTS systems. My 14.04 LTS systems do not
have any problems with backports.

My 12.04 systems include:
minimally installed laptop
minimally installed VPS
minimally installed firewall
minimally installed virtualbox vm
remastered live CD and its chroot master
remastered ubuntu-rescue-remix live CD and its chroot master
12.04 chroot for running older programs that won't work under 14.04

Since its happening to all the 12.04 installs I have, I think this is
widespread. I'm surprised there hasn't been a bug filed on it already.

"apt-cache policy" crashed until I removed backports and did an update
again.

I consider this to be a security issue as it was blocking me from
getting recent SSL/encryption updates that my 14.04 systems could get
without problems. As a whole, it would block all updates until backports
was removed.

I did a tar.gz of anything "backports" in /var and attached it. My guess
is that some kind of malformed entry in one of the apt description files
got corrupted somehow. These files should allow for separate bug
reproduction in case backports gets changed in the mean time.

----------

lsb_release -rd
Description:	Ubuntu 12.04.5 LTS
Release:	12.04

apt-cache policy apt
apt:
  Installed: 0.8.16~exp12ubuntu10.24
  Candidate: 0.8.16~exp12ubuntu10.24
  Version table:
 *** 0.8.16~exp12ubuntu10.24 0
        500 http://archive.ubuntu.com/ubuntu/ precise-updates/main i386 Packages
        100 /var/lib/dpkg/status
     0.8.16~exp12ubuntu10.21 0
        500 http://security.ubuntu.com/ubuntu/ precise-security/main i386 Packages
     0.8.16~exp12ubuntu10 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main i386 Packages

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

-- 
apt-get update segmentation fault with backports
https://bugs.launchpad.net/bugs/1464801
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