vim locks up when freeing lots of objects

[Michael Leuchtenburg]

When using a heavy plugin (e.g. unite, ctrlP, many others), vim's GC is stressed. vim's GC has a performance bug which causes it to be O(n^2), which results in vim freezing up when it runs. This is fixed in a newer version of vim. This patch should be considered for backporting.

The patch is here: https://groups.google.com/forum/#!topic/vim_dev/pXjj7rww5RY

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: vim-gtk 2:7.4.273-2ubuntu4
ProcVersionSignature: Ubuntu 3.16.0-29.39-generic 3.16.7-ckt2
Uname: Linux 3.16.0-29-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
Date: Tue Apr 7 12:00:38 2015
InstallationDate: Installed on 2014-03-12 (390 days ago)
InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64 (20140204)
SourcePackage: vim
UpgradeStatus: Upgraded to utopic on 2015-01-09 (87 days ago)

[Paul White (paulw2u)]

From Ubuntu changelog showing bug fixed:

vim (2:7.4.712-1) unstable; urgency=medium

  * Merge upstream tag v7-4-712
    + 7.4.586: Remove a cyclic dependency when generating documentation, which
      results in unreproducible builds. (Closes: #775562)
    + 7.4.609: Use a stack of dicts and lists to be marked for garbage
      collection, thus making it iterative instead of recursive. Fixes crash
      with some plugins written in other languages (e.g., lua). (Closes:
      #778821)
    + runtime/syntax/registry.vim: Correct highlighting of comments. (Closes:
      #687199)
    + runtime/syntax/strace.vim: Highlight 2-digit escape sequences the same
      as 1 or 3-digit escape sequences. (Closes: #775113)
  * Remove backported patches upstream/v7-4-576.patch and
    upstream/netrwSavePosn.patch.
  * Add a Build-Conflict for autoconf2.13 to avoid a FTBFS if it's installed.
    (Closes: #781031)

 -- James McCoy <email address hidden> Sat, 25 Apr 2015 09:00:09 -0400