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[Launchpad Bug Tracker <1794053@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package apt - 1.7.0~rc2ubuntu1

---------------
apt (1.7.0~rc2ubuntu1) cosmic; urgency=medium

  * Fix calculation of elapsed usec in downloads
  * pkgCacheFile: Only unlock in destructor if locked before (LP: #1794053)

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Mon, 24 Sep 2018 12:18:26
+0200

** Changed in: apt (Ubuntu Cosmic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1794053

Title:
  pkgCacheFile unlocks in destructor even if it did not acquire lock

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Trusty:
  Triaged
Status in apt source package in Xenial:
  Triaged
Status in apt source package in Bionic:
  Triaged
Status in apt source package in Cosmic:
  Fix Released

Bug description:
  [Impact]
  Closing a cache file unlocks the system (loses the lock). This randomly breaks ubuntu-make, for example.

  [Test case]
  The following Python code fails, but should succeed, as it locks first, opens a cache and closes it, and then unlocks.

  
  import apt_pkg, os, gc

  apt_pkg.init()
  apt_pkg.pkgsystem_lock()

  os.system("ls -l /proc/%d/fd" % os.getpid())
  apt_pkg.Cache()

  gc.collect()

  os.system("ls -l /proc/%d/fd" % os.getpid())

  apt_pkg.pkgsystem_unlock()

  [Regression potential]
  This fixes a regression introduced in 2001 by 

  commit b2e465d6d32d2dc884f58b94acb7e35f671a87fe
  Author: Arch Librarian <arch@xxxxxxxxxxxxx>
  Date:   Mon Sep 20 16:56:32 2004 +0000

      Join with aliencode
      Author: jgg
      Date: 2001-02-20 07:03:16 GMT
      Join with aliencode

  The fix is to only UnLock from the cache file if the cache file locked
  before. It's unclear how far code relies on that regression. That
  said, any potential regression should be easily noticable, as it would
  be a case of not unlocking where we were unlocking before.

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