My dmesg is getting flooded by apparmor audit messages, mostly from libreoffice (profiles libreoffice-soffice and libreoffice-oosplash):
$ dmesg | tail -n 25
[13682.452555] audit: type=1400 audit(1571920851.001:3672): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/drirc.d/00-mesa-defaults.conf" pid=17792 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[13682.453430] audit: type=1400 audit(1571920851.001:3673): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/drirc.d/00-mesa-defaults.conf" pid=17792 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[13682.453933] audit: type=1400 audit(1571920851.001:3674): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/libdrm/amdgpu.ids" pid=17792 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[13682.455491] audit: type=1400 audit(1571920851.005:3675): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/home/chris/.cache/mesa_shader_cache/index" pid=17792 comm="soffice.bin" requested_mask="wrc" denied_mask="wrc" fsuid=1000 ouid=1000
[13682.604100] audit: type=1400 audit(1571920851.153:3676): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/home/chris/.local/share/gvfs-metadata/smb-share:server=buddha,share=chris" pid=17791 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
[13682.604138] audit: type=1400 audit(1571920851.153:3677): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/home/chris/.local/share/gvfs-metadata/smb-share:server=buddha,share=chris-22028640.log" pid=17791 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
[13683.097648] audit: type=1400 audit(1571920851.645:3678): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/home/chris/.mozilla/firefox/vq2zzheq.chris-2019-09/cert8.db" pid=17791 comm="soffice.bin" requested_mask="w" denied_mask="w" fsuid=1000 ouid=1000
[16676.510664] kauditd_printk_skb: 1210 callbacks suppressed
[16676.510665] audit: type=1400 audit(1571923845.047:4889): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/drirc.d/00-mesa-defaults.conf" pid=18543 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16676.511473] audit: type=1400 audit(1571923845.047:4890): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/drirc.d/00-mesa-defaults.conf" pid=18543 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16676.550636] audit: type=1400 audit(1571923845.087:4891): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/drirc.d/00-mesa-defaults.conf" pid=18543 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16676.551394] audit: type=1400 audit(1571923845.087:4892): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/drirc.d/00-mesa-defaults.conf" pid=18543 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16676.552145] audit: type=1400 audit(1571923845.087:4893): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/drirc.d/00-mesa-defaults.conf" pid=18543 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16676.552568] audit: type=1400 audit(1571923845.087:4894): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/usr/share/libdrm/amdgpu.ids" pid=18543 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16676.553912] audit: type=1400 audit(1571923845.091:4895): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/home/chris/.cache/mesa_shader_cache/index" pid=18543 comm="soffice.bin" requested_mask="wrc" denied_mask="wrc" fsuid=1000 ouid=1000
[16694.388901] audit: type=1400 audit(1571923862.923:4896): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/proc/18541/mountinfo" pid=18541 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
[16694.388972] audit: type=1400 audit(1571923862.923:4897): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/proc/18541/cgroup" pid=18541 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
[16694.388992] audit: type=1400 audit(1571923862.923:4898): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/sys/fs/cgroup/memory/memory.limit_in_bytes" pid=18541 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16694.389011] audit: type=1400 audit(1571923862.923:4899): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/sys/fs/cgroup/cpu,cpuacct/cpu.cfs_quota_us" pid=18541 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16694.389017] audit: type=1400 audit(1571923862.923:4900): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/sys/fs/cgroup/cpu,cpuacct/cpu.cfs_period_us" pid=18541 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16694.389022] audit: type=1400 audit(1571923862.923:4901): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/sys/fs/cgroup/cpu,cpuacct/cpu.shares" pid=18541 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16694.389028] audit: type=1400 audit(1571923862.923:4902): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/sys/fs/cgroup/cpu,cpuacct/cpu.cfs_quota_us" pid=18541 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16694.389032] audit: type=1400 audit(1571923862.923:4903): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/sys/fs/cgroup/cpu,cpuacct/cpu.cfs_period_us" pid=18541 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16694.389036] audit: type=1400 audit(1571923862.923:4904): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/sys/fs/cgroup/cpu,cpuacct/cpu.shares" pid=18541 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
[16694.389040] audit: type=1400 audit(1571923862.923:4905): apparmor="ALLOWED" operation="open" profile="libreoffice-soffice" name="/sys/fs/cgroup/memory/memory.limit_in_bytes" pid=18541 comm="soffice.bin" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
$ journalctl -b | grep audit | wc -l
6150
Note the "kauditd_printk_skb: 1210 callbacks suppressed" above, such lines are interspersed regularly.
This is on a minimal install of 18.04.3 with libreoffice manually added. I haven't touched the apparmor configuration.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: apparmor 2.12-4ubuntu5.1
ProcVersionSignature: Ubuntu 5.0.0-32.34~18.04.2-generic 5.0.21
Uname: Linux 5.0.0-32-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 24 15:46:53 2019
InstallationDate: Installed on 2019-09-23 (30 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
ProcKernelCmdline: BOOT_IMAGE=/@/boot/vmlinuz-5.0.0-32-generic root=UUID=7cf22442-68f1-433a-981f-b266ceb58484 ro rootflags=subvol=@ quiet splash vt.handoff=1
SourcePackage: apparmor
Syslog:
Oct 24 10:51:43 kenny dbus-daemon[19581]: [session uid=1000 pid=19581] AppArmor D-Bus mediation is enabled
Oct 24 10:52:51 kenny dbus-daemon[1019]: [system] AppArmor D-Bus mediation is enabled
Oct 24 10:52:54 kenny dbus-daemon[1164]: [session uid=121 pid=1164] AppArmor D-Bus mediation is enabled
Oct 24 10:53:03 kenny dbus-daemon[1979]: [session uid=1000 pid=1979] AppArmor D-Bus mediation is enabled
Oct 24 10:53:58 kenny dbus-daemon[2727]: [session uid=0 pid=2725] AppArmor D-Bus mediation is enabled
UpgradeStatus: No upgrade log present (probably fresh install)
libreoffice ships this profile, so the bug should be tracked there.