Public bug reported:
Since my last reboot, Firefox has been logspamming my system with the
following message:
Dec 19 08:21:12 work kernel: audit: type=1400
audit(1766096472.659:55003): apparmor="DENIED" operation="open"
class="file" profile="snap.firefox.firefox" name="/proc/pressure/memory"
pid=13905 comm="MemoryPoller" requested_mask="r" denied_mask="r"
fsuid=1000 ouid=0
This message has occurred previously at a much lower frequency:
$ journalctl --boot --dmesg | fgrep 'profile="snap.firefox.firefox"
name="/proc/pressure/memory"' | wc -l
10255
$ zgrep 'profile="snap.firefox.firefox" name="/proc/pressure/memory"' kern.log*
| cut -d: -f2- | cut -dT -f1 | sort | uniq -c
1 2025-11-17
2 2025-11-24
8 2025-11-27
2 2025-12-05
2 2025-12-06
2690 2025-12-15
1513 2025-12-16
2405 2025-12-17
3362 2025-12-18
295 2025-12-19
I'm filing this against Firefox, since presumably it's responsible for
supplying a correct AppArmor profile for itself, but it's possible that
this has been activated by a kernel or AppArmor upgrade. Here's the
relevant version info:
$ snap info firefox
name: firefox
summary: Mozilla Firefox web browser
publisher: Mozilla✓
store-url: https://snapcraft.io/firefox
contact:
https://support.mozilla.org/kb/file-bug-report-or-feature-request-mozilla
license: unset
description: |
Firefox is a powerful, extensible web browser with support for modern web
application
technologies.
commands:
- firefox
- firefox.geckodriver
snap-id: 3wdHCAVyZEmYsCMFDE9qt92UV8rC8Wdk
tracking: latest/stable
refresh-date: 7 days ago, at 17:34 AEST
channels:
latest/stable: 146.0-2 2025-12-11 (7477) 262MB -
latest/candidate: 146.0.1-1 2025-12-18 (7559) 262MB -
latest/beta: 147.0b5-1 2025-12-18 (7560) 265MB -
latest/edge: 148.0a1 2025-12-18 (7565) 300MB -
esr/stable: 140.6.0esr-1 2025-12-10 (7454) 258MB -
esr/candidate: 140.6.0esr-1 2025-12-16 (7548) 258MB -
esr/beta: ↑
esr/edge: ↑
installed: 146.0-2 (7477) 262MB -
$ uptime
08:13:33 up 3 days, 22:43, 1 user, load average: 0.81, 0.97, 1.08
$ last | grep running
reboot system boot 6.14.0-37-generi Mon Dec 15 09:30 still running
$ grep -i apparmor /var/log/dpkg.log | tail
2025-12-12 16:42:46 status half-installed apparmor:amd64
4.0.1really4.0.1-0ubuntu0.24.04.4
2025-12-12 16:42:47 status unpacked apparmor:amd64
4.0.1really4.0.1-0ubuntu0.24.04.5
2025-12-12 16:43:10 configure libapparmor1:amd64
4.0.1really4.0.1-0ubuntu0.24.04.5 <none>
2025-12-12 16:43:10 status unpacked libapparmor1:amd64
4.0.1really4.0.1-0ubuntu0.24.04.5
2025-12-12 16:43:10 status half-configured libapparmor1:amd64
4.0.1really4.0.1-0ubuntu0.24.04.5
2025-12-12 16:43:10 status installed libapparmor1:amd64
4.0.1really4.0.1-0ubuntu0.24.04.5
2025-12-12 16:43:10 configure apparmor:amd64 4.0.1really4.0.1-0ubuntu0.24.04.5
<none>
2025-12-12 16:43:10 status unpacked apparmor:amd64
4.0.1really4.0.1-0ubuntu0.24.04.5
2025-12-12 16:43:11 status half-configured apparmor:amd64
4.0.1really4.0.1-0ubuntu0.24.04.5
2025-12-12 16:43:17 status installed apparmor:amd64
4.0.1really4.0.1-0ubuntu0.24.04.5
$ dpkg -l apparmor linux-image-generic\*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version
Architecture Description
+++-=============================-=================================-============-======================================
ii apparmor 4.0.1really4.0.1-0ubuntu0.24.04.5 amd64
user-space parser utility for AppArmor
ii linux-image-generic-hwe-24.04 6.14.0-37.37~24.04.1 amd64
Generic Linux kernel image
(All timestamps in this report are AEST - UTC+10:00.)
** Affects: firefox (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2136840
Title:
Firefox snap AppArmor logspam for /proc/pressure/memory
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