[Bug]: Mattermost 5.2.1 crashes due to AppArmor denial

[najamansari]

What happened?

mattermost-desktop 5.2.1 randomly crashes. dmesg output shows an AppArmor denial for the file /proc/${PID}/oom_score_adj

What should have happened?

Mattermost should not crash. It should also not attempt to adjust its own OOM score but that is probably a separate bug report.

Output of snap info $snap_name

name:      mattermost-desktop
summary:   Open source, private cloud Slack-alternative
publisher: Snapcrafters
store-url: https://snapcraft.io/mattermost-desktop
contact:   https://github.com/snapcrafters/mattermost-desktop/issues
license:   unset
description: |
  Mattermost is secure workplace messaging from behind your firewall.

    - Discuss topics in private groups, one-to-one or team-wide
    - Easily share and view image files
    - Connect in-house systems with webhooks and Slack-compatible integrations

  To use this app, you need a URL for a Mattermost server.

  -------

  Host your own server: https://about.mattermost.com/download
  Terms of Service: http://about.mattermost.com/terms/
  Contribute to the project: https://github.com/mattermost/desktop

  This snap is maintained by the Snapcrafters community, and is not necessarily endorsed or
  officially maintained by the upstream developers.
commands:
  - mattermost-desktop
snap-id:      ed0pxJoDHrgmAWHH7baX5nryAHy1UNj0
tracking:     latest/stable
refresh-date: yesterday at 20:40 PKT
channels:
  latest/stable:    5.2.1 2022-11-21 (567) 135MB -
  latest/candidate: 5.2.1 2022-11-17 (567) 135MB -
  latest/beta:      ↑                            
  latest/edge:      5.2.1 2022-11-24 (571) 135MB -
installed:          5.2.1            (567) 135MB -

Output of snap connections $snap_name

Interface               Plug                                       Slot                            Notes
audio-playback          mattermost-desktop:audio-playback          :audio-playback                 -
audio-record            mattermost-desktop:audio-record            -                               -
camera                  mattermost-desktop:camera                  -                               -
content[gnome-42-2204]  mattermost-desktop:gnome-42-2204           gnome-42-2204:gnome-42-2204     -
content[gtk-3-themes]   mattermost-desktop:gtk-3-themes            gtk-common-themes:gtk-3-themes  -
content[icon-themes]    mattermost-desktop:icon-themes             gtk-common-themes:icon-themes   -
content[sound-themes]   mattermost-desktop:sound-themes            gtk-common-themes:sound-themes  -
desktop                 mattermost-desktop:desktop                 :desktop                        -
desktop-legacy          mattermost-desktop:desktop-legacy          :desktop-legacy                 -
gsettings               mattermost-desktop:gsettings               :gsettings                      -
home                    mattermost-desktop:home                    :home                           -
login-session-observe   mattermost-desktop:login-session-observe   -                               -
network                 mattermost-desktop:network                 :network                        -
network-bind            mattermost-desktop:network-bind            :network-bind                   -
opengl                  mattermost-desktop:opengl                  :opengl                         -
pulseaudio              mattermost-desktop:pulseaudio              :pulseaudio                     -
removable-media         mattermost-desktop:removable-media         -                               -
screen-inhibit-control  mattermost-desktop:screen-inhibit-control  :screen-inhibit-control         -
shared-memory           mattermost-desktop:shmem                   :shared-memory                  -
unity7                  mattermost-desktop:unity7                  :unity7                         -
wayland                 mattermost-desktop:wayland                 :wayland                        -
x11                     mattermost-desktop:x11                     :x11                            -

Output of snap version

snap    2.57.5
snapd   2.57.5
series  16
ubuntu  22.10
kernel  5.19.0-23-generic

Relevant log output

[ 5836.619833] mattermost-desk[30360]: segfault at 15c0030ba000 ip 00007ffb13777dc5 sp 00007fff08d871c0 error 4 in libayatana-appindicator3.so.1.0.0[7ffb13774000+6000]
[ 5836.619850] Code: 8b 73 40 49 89 c5 4d 85 f6 0f 84 86 00 00 00 48 8d 54 24 0c 48 8d 74 24 10 4c 89 ef 31 db e8 d2 cc ff ff 66 90 48 8b 44 24 10 <48> 8b 3c d8 39 5c 24 0c 7f 09 48 85 ff 0f 85 98 01 00 00 4c 89 f6
[ 5841.953024] audit: type=1326 audit(1669369399.159:401): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.mattermost-desktop.mattermost-desktop pid=42000 comm="mattermost-desk" exe="/snap/mattermost-desktop/567/opt/Mattermost/mattermost-desktop" sig=0 arch=c000003e syscall=330 compat=0 ip=0x7fac9d08911b code=0x50000
[ 5842.312940] audit: type=1107 audit(1669369399.519:402): pid=1250 uid=102 auid=4294967295 ses=4294967295 subj=unconfined msg='apparmor="DENIED" operation="dbus_method_call"  bus="system" path="/" interface="org.freedesktop.DBus.ObjectManager" member="GetManagedObjects" mask="send" name="org.bluez" pid=42000 label="snap.mattermost-desktop.mattermost-desktop" peer_pid=1246 peer_label="unconfined"
                exe="/usr/bin/dbus-daemon" sauid=102 hostname=? addr=? terminal=?'
[ 5842.313328] audit: type=1326 audit(1669369399.519:403): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.mattermost-desktop.mattermost-desktop pid=42000 comm="mattermost-desk" exe="/snap/mattermost-desktop/567/opt/Mattermost/mattermost-desktop" sig=0 arch=c000003e syscall=314 compat=0 ip=0x7fac9d080a3d code=0x50000
[ 5842.315832] audit: type=1400 audit(1669369399.523:404): apparmor="DENIED" operation="open" class="file" profile="snap.mattermost-desktop.mattermost-desktop" name="/proc/42112/oom_score_adj" pid=42000 comm="ThreadPoolSingl" requested_mask="wc" denied_mask="wc" fsuid=1000 ouid=1000
[ 5842.338729] audit: type=1326 audit(1669369399.547:405): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.mattermost-desktop.mattermost-desktop pid=42112 comm="mattermost-desk" exe="/snap/mattermost-desktop/567/opt/Mattermost/mattermost-desktop" sig=0 arch=c000003e syscall=203 compat=0 ip=0x7f020a3a05b1 code=0x50000
[ 5842.338735] audit: type=1326 audit(1669369399.547:406): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.mattermost-desktop.mattermost-desktop pid=42112 comm="mattermost-desk" exe="/snap/mattermost-desktop/567/opt/Mattermost/mattermost-desktop" sig=0 arch=c000003e syscall=203 compat=0 ip=0x7f020a3a05b1 code=0x50000
[ 5842.338737] audit: type=1326 audit(1669369399.547:407): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.mattermost-desktop.mattermost-desktop pid=42112 comm="mattermost-desk" exe="/snap/mattermost-desktop/567/opt/Mattermost/mattermost-desktop" sig=0 arch=c000003e syscall=203 compat=0 ip=0x7f020a3a05b1 code=0x50000
[ 5842.338738] audit: type=1326 audit(1669369399.547:408): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.mattermost-desktop.mattermost-desktop pid=42112 comm="mattermost-desk" exe="/snap/mattermost-desktop/567/opt/Mattermost/mattermost-desktop" sig=0 arch=c000003e syscall=203 compat=0 ip=0x7f020a3a05b1 code=0x50000
[ 5842.338740] audit: type=1326 audit(1669369399.547:409): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.mattermost-desktop.mattermost-desktop pid=42112 comm="mattermost-desk" exe="/snap/mattermost-desktop/567/opt/Mattermost/mattermost-desktop" sig=0 arch=c000003e syscall=203 compat=0 ip=0x7f020a3a05b1 code=0x50000
[ 5842.338741] audit: type=1326 audit(1669369399.547:410): auid=1000 uid=1000 gid=1000 ses=3 subj=snap.mattermost-desktop.mattermost-desktop pid=42112 comm="mattermost-desk" exe="/snap/mattermost-desktop/567/opt/Mattermost/mattermost-desktop" sig=0 arch=c000003e syscall=203 compat=0 ip=0x7f020a3a05b1 code=0x50000

Teminal output of app

No response

[jugmac00]

I experience the same issue, but on Ubuntu 20.04.

Additionally my journal is flooded with:

Nov 25 10:25:36 XPS-13-9310 mattermost-desktop_mattermost-desktop.desktop[506658]: [506658:1125/102536.068266:ERROR:browser_main_loop.cc(269)] GLib: g_str_has_prefix: assertion 'str != NULL' failed

[alexmurray]

It is not clear that is crash is due to the AppArmor denial - more likely I suspect some issue between mattermost and libayatana-indicator given the first line of the output above.

[jnsgruk]

Okay, this looks very related: https://bugs.launchpad.net/ubuntu/+source/libappindicator/+bug/1867996

[jnsgruk]

@kenvandine it sounds like @jugmac00 also suffered a crash while using the branch you published for the gnome-42-2204 snap :/

Update including the error that preceded the crash:

[Do Dez  8 08:44:16 2022] mattermost-desk[899218]: segfault at 3b3c03683000 ip 00007fc9106e9dc5 sp 00007ffc83fee410 error 4 in libayatana-appindicator3.so.1.0.0[7fc9106e6000+6000]

[jugmac00]

Since installing the latest candidate version on Wednesday, 2023-04-05, I do not experience crashes anymore.

sudo snap refresh mattermost-desktop --channel=latest/candidate

@najamansari Could you also update and check whether this issue is fixed for you?

[najamansari]

@najamansari Could you also update and check whether this issue is fixed for you?

I have just installed it on my machine, will update here after a day or two of usage.

[mitchdz]

I have also been seeing this same issue On Ubuntu 22.04 using regolith-desktop DE.

The version of mattermost-desktop that is installed that I noticed the crashes is 5.2.2 and I see dmesg with very similar logs:

[631188.933363] mattermost-desk[3589451]: segfault at 1c7803682000 ip 00007ff820f70dc5 sp 00007ffff7f6b680 error 4 in libayatana-appindicator3.so.1.0.0[7ff820f6d000+6000]

I have just updated mattermost with

sudo snap refresh mattermost-desktop --channel=latest/candidate

To version 5.3.1 and will update if I see any more crashes.

[mitchdz]

I had mattermost-desktop crash on me again, but did not see the above segfault - instead I saw the following in dmesg which I did not observe last time.

[637376.354623] traps: mattermost-desk[3951104] trap int3 ip:5604f80faf4b sp:7ffda02b5500 error:0 in mattermost-desktop[5604f7c98000+7859000]

It is to be noted that

• I did not reboot after upgrading mattermost-desktop
• I see the error usually when I leave my laptop for a bit and come back to put the mattermost window into focus.

[mitchdz]

Coming back to this issue, mattermost-desktop snap version 5.3.1 is in my opinion more stable in my environment (Ubuntu 22.04 using regolith-desktop), I see less crashes with this version.

[mitchdz]

Maybe close this issue since 5.4.0 is out now?