gitlab spams /tmp dir in docker container with gitlab-pages

Summary

I have a GitLab CE instance running on an ubuntu server using the official gitlab-ce docker image. The usual data volumes are mounted to a host directory srv/gitlab, which resides on a separate disk.

volumes:
      - '/srv/gitlab/config:/etc/gitlab'
      - '/srv/gitlab/logs:/var/log/gitlab'
      - '/srv/gitlab/data:/var/opt/gitlab'

This morning I found the root drive 100% used, with the major amount beeing used by the running gitlab-ce docker container (10.1 GB). Digging into it I found the /tmp dir inside the container is 9.3 GB in size, being entirely made up of gitlab-pages-<sometimestamp> directories (996 apparently).

After clearing out the /tmp dir it immediately starts filling up again, at approx. 1-2 gitlab-pages-<sometimestamp> directories per second!

I currently have one single repository which uses pages to publish a Sandcastle built library documentation on tagged builds. Since this has been established only 2 tags were added to the project.

The container is stopped and restarted daily by an automated maintenance procedure. I'm using GitLab CE 10.7.0.

What is the current bug behavior?

GitLab fills up the docker containers' /tmp directory with gitlab-pages-<sometimestamp> directories until the host disk runs out of space.

What is the expected correct behavior?

GitLab must not repeately spam files into the /tmp dir.

The /tmp dir contents should not grow endlessly but instead be cleaned up on a regular basis, at least on a container restart.

Also /tmp files should be removed when they are no longer needed.

Relevant logs and/or screenshots

Results of docker system df -v

Results of du -hsx /* | sort -rh | head -n 40 on the docker container root

Expand for output

root@gitlab:/# du -hsx /* | sort -rh | head -n 40
9.3G /tmp
1.4G /opt
130M /usr
24M /var
24M /lib
7.4M /bin
3.5M /sbin
2.2M /etc
32K /run
28K /assets
12K /root
4.0K /srv
4.0K /mnt
4.0K /media
4.0K /lib64
4.0K /home
4.0K /boot
4.0K /RELEASE
0 /sys
0 /proc
0 /dev

Results of du -hsx /* | sort -rh | head -n 40 on containers' /tmp dir

Expand for output

root@gitlab:/# du -hsx /tmp/* | sort -rh | head -n 20
9.6M /tmp/gitlab-pages-1524465583158923969
9.6M /tmp/gitlab-pages-1524465582125403367
9.6M /tmp/gitlab-pages-1524454211109324575
9.6M /tmp/gitlab-pages-1524454209747360893
9.6M /tmp/gitlab-pages-1524454208716069855
9.6M /tmp/gitlab-pages-1524454207684050608
9.6M /tmp/gitlab-pages-1524454206651237250
9.6M /tmp/gitlab-pages-1524454205383355475
9.6M /tmp/gitlab-pages-1524454204350860122
9.6M /tmp/gitlab-pages-1524454203312405992
9.6M /tmp/gitlab-pages-1524454202279725437
9.6M /tmp/gitlab-pages-1524454201247414286
9.6M /tmp/gitlab-pages-1524454200216047447
9.6M /tmp/gitlab-pages-1524454199185104114
9.6M /tmp/gitlab-pages-1524454198153812276
9.6M /tmp/gitlab-pages-1524454196871811221
9.6M /tmp/gitlab-pages-1524454195836429231
9.6M /tmp/gitlab-pages-1524454194805022391
9.6M /tmp/gitlab-pages-1524454193771707728
9.6M /tmp/gitlab-pages-1524454192737619754

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System:
Current User: git
Using RVM: no
Ruby Version: 2.3.6p384
Gem Version: 2.6.13
Bundler Version:1.13.7
Rake Version: 12.3.0
Redis Version: 3.2.11
Git Version: 2.14.3
Sidekiq Version:5.0.5
Go Version: unknown
GitLab information
Version: 10.7.0
Revision: 2011c9b
Directory: /opt/gitlab/embedded/service/gitlab-rails
DB Adapter: postgresql
URL:  https://gitlab.ad.haprotec.de
HTTP Clone URL: https://gitlab.ad.haprotec.de/some-group/some-project.git
SSH Clone URL: git@gitlab.ad.haprotec.de:some-group/some-project.git
Using LDAP: yes
Using Omniauth: no
GitLab Shell
Version: 7.1.2
Repository storage paths:

• default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git

Results of GitLab application Check

Expand for output related to the GitLab application check

Checking GitLab ...
Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ...
3/3 ... yes
3/4 ... yes
6/8 ... yes
6/9 ... yes
6/10 ... yes
9/11 ... yes
10/12 ... yes
8/13 ... yes
8/16 ... yes
10/17 ... yes
6/18 ... yes
6/19 ... yes
8/21 ... yes
11/22 ... yes
8/23 ... yes
9/24 ... yes
9/25 ... yes
9/26 ... yes
11/27 ... yes
15/28 ... yes
11/29 ... yes
16/30 ... yes
8/31 ... yes
17/32 ... yes
6/34 ... yes
9/35 ... yes
9/36 ... yes
11/37 ... yes
16/38 ... yes
16/39 ... yes
8/40 ... yes
6/41 ... yes
15/42 ... yes
9/43 ... yes
9/44 ... yes
27/45 ... yes
11/46 ... yes
6/47 ... yes
9/48 ... yes
11/49 ... yes
9/51 ... yes
22/53 ... yes
27/55 ... yes
9/56 ... yes
9/57 ... yes
9/58 ... yes
6/59 ... yes
29/60 ... yes
30/62 ... yes
29/63 ... yes
31/64 ... yes
32/65 ... yes
16/68 ... yes
15/69 ... yes
67/70 ... yes
32/71 ... yes
8/72 ... yes
69/73 ... yes
9/74 ... yes
16/75 ... yes
11/76 ... yes
11/77 ... yes
9/78 ... yes
9/79 ... yes
72/81 ... yes
71/82 ... yes
9/84 ... yes
22/85 ... yes
73/86 ... yes
75/87 ... yes
74/88 ... yes
75/89 ... yes
75/90 ... yes
76/93 ... yes
11/95 ... yes
9/96 ... yes
73/97 ... yes
29/98 ... yes
82/99 ... yes
82/100 ... yes
9/101 ... yes
Redis version >= 2.8.0? ... yes
Ruby version >= 2.3.5 ? ... yes (2.3.6)
Git version >= 2.9.5 ? ... yes (2.14.3)
Git user has default SSH configuration? ... yes
Active users: ... 22
Checking GitLab ... Finished