Redmine

similar problem, but my entire repository is stopped from 2 months (both repository and revisions)
this issue has happened many times to me, everytime I delete repository and recreate, redmine works for a long time (even a couple of hours) and rebuild it
then, it works for a while (a couple of months) and then hangs again

mysql-server-5.7
ruby2.3
git 1:2.7.4-0ubuntu1.1

"ruby bin/about" output:

/var/lib/gems/2.3.0/gems/htmlentities-4.3.1/lib/htmlentities/mappings/expanded.rb:465: warning: key "inodot" is duplicated and overwritten on line 466

sh: 1: darcs: not found
sh: 1: hg: not found
sh: 1: cvs: not found
sh: 1: bzr: not found
Environment:
  Redmine version                3.3.0.stable
  Ruby version                   2.3.1-p112 (2016-04-26) [x86_64-linux-gnu]
  Rails version                  4.2.6
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.9.3
  Git                            2.7.4
  Filesystem
Redmine plugins:
  my_projects                    1.4
  redmine_checklists             3.1.3
  redmine_code_review            0.7.0
  redmine_contacts               4.0.4
  redmine_custom_css             0.1.6
  redmine_default_custom_query   1.2.0
  redmine_favorite_projects      2.0.2
  redmine_jstoolbar_ext          0.2.1
  redmine_jstoolbar_ext_coderay  0.2.0
  redmine_jstoolbar_ext_images   0.2.0
  redmine_lightbox2              0.3.2
  redmine_my_page_queries        2.1.6
  redmine_people                 1.2.0
  redmine_questions              0.0.7
  redmine_release_notes          1.3.1
  redmine_stats                  0.0.3
  redmine_tweaks                 0.5.8-dev
  redmine_wiki_extensions        0.7.0

again, 2 months from last time...
in logs there is this error: #11841