** Description changed:
+ [ Impact ]
+
+ * The indicator-keyboard-service process suffers from a memory leak
+ that quickly consumes the entire available memory of the system until
+ the process is killed by the OOM daemon. Since indicator-keyboard is a
+ session service it will be restarted and the process repeats, making the
+ system unusable. On the system where I tested this indicator-keyboard-
+ service started with ~2MB and quickly rose to consume all 64GB of
+ memory. The session then appears to hang for about a minute until the
+ OOM daemon kills the process.
+
+ [ Test Plan ]
+
+ * Prerequisites:
+ - A running gnome-session-flashback XOrg session
+
+ * Ensure you have multiple input sources configured, for example:
+ $ dconf read /org/gnome/desktop/input-sources/sources
+ [('xkb', 'us'), ('ibus', 'libpinyin')]
+
+ * Start indicator-keyboard-service via:
+ $ indicator-keyboard-service --use-gtk
+
+ * Watch the memory consumption to raise quickly and consume all
+ available memory until it is being killed by the OOM daemon.
+
+
+ [ Regression Potential ]
+
+ * The regression potential is very low since indicator-keyboard-service
+ is already suffering from a memory leak that is causing it to be killed
+ by the OOM daemon every few minutes. It is unlikely that this change
+ will make the problem worse.
+
+ * User base of indicator-keyboard is low. The main users of this
+ package are Unity and Gnome Flashback and both are not default desktops
+ on Ubuntu. Gnome Shell does not depend on indicator-keyboard. So a
+ potential regression would only affect users of these desktops.
+
+ * The source code changes include the removal of a redundant
+ initialization of IBus in two functions of indicator-keyboard-service
+ and instead move the initialization to the constructor of the indicator
+ keyboard service. No new functionality is added and the existing
+ behavior of the application is not changes except for consolidation of
+ the redundant IBus initialization calls.
+
+ * On GNOME Flashback another workaround exists in case there is an
+ unexpected regression due to this chaneg. In the unlikely event that the
+ change has a side effect and prevents the indicator from working, users
+ an switch to the newer "System Indicators" applet and remove the
+ indicator-keyboard package completely.
+
+ NEWS
+
+ The fix is available in version 0.0.0+19.10.20240924-0ubuntu1
+
+ === Original Description ===
+
Description:
The system was previously on 22.04, then upgraded to 23.10 to the
current daily 24.04. System will freeze up a few minutes after startup
(with no apparent related crashes). After various trial and error, the
possible cause is isolated to indicator-keyboard when running gnome-
session-flashback (freeze does not happen anymore with flashback
interface, after indicator-keyboard package is removed). Not sure why
this is not happening with vanilla gdm3. Also, the freeze was first
observed after the upgrade to 23.10.
**logs below taken from `sudo journalctl --since "3 hours ago" | grep
indicator`**
Feb 29 16:49:03 machine kernel:
oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=user.slice,mems_allowed=0,global_oom,task_memcg=/user.slice/user-1000.slice/user@1000.service/app.slice/indicator-keyboard.service,task=indicator-keybo,pid=5810,uid=1000
Feb 29 16:49:03 machine kernel: Out of memory: Killed process 5810
(indicator-keybo) total-vm:66620172kB, anon-rss:64296784kB, file-rss:768kB,
shmem-rss:0kB, UID:1000 pgtables:129412kB oom_score_adj:200
Feb 29 16:49:03 machine kernel: oom_reaper: reaped process 5810
(indicator-keybo), now anon-rss:688kB, file-rss:768kB, shmem-rss:0kB
Feb 29 16:48:56 machine systemd[5304]: indicator-keyboard.service: A process
of this unit has been killed by the OOM killer.
Feb 29 16:48:57 machine systemd[5304]: indicator-keyboard.service: Main
process exited, code=killed, status=9/KILL
Feb 29 16:48:57 machine systemd[5304]: indicator-keyboard.service: Failed
with result 'oom-kill'.
Feb 29 16:48:57 machine systemd[5304]: indicator-keyboard.service: Consumed
1min 11.913s CPU time.
Feb 29 16:48:58 machine systemd[5304]: indicator-keyboard.service: Scheduled
restart job, restart counter is at 1.
Feb 29 16:48:58 machine systemd[5304]: Started indicator-keyboard.service -
Indicator Keyboard Backend.
Feb 29 17:00:40 machine dbus-daemon[1111]: [system] Activating via systemd:
service name='org.freedesktop.login1'
unit='dbus-org.freedesktop.login1.service' requested by ':1.9' (uid=0 pid=1588
comm="apt remove indicator-keyboard" label="unconfined")
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https://bugs.launchpad.net/bugs/2055388
Title:
suspected memory leak with indicator-keyboard (causing gnome-session-
flashback to freeze after startup)
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