Public bug reported:

Screensaver crashes -- then fails to lock screen -- here is syslog

Oct 20 19:07:44 ThinkPad-T460s acpid: input device has been disconnected, fd 21
Oct 20 19:07:44 ThinkPad-T460s dbus-daemon[2431]: [session uid=1001 pid=2431] 
Successfully activated service 'org.freedesktop.Notifications'
Oct 20 19:08:13 ThinkPad-T460s kernel: [ 4398.269137] mate-screensave[2896]: 
segfault at 0 ip 00007fefaf1d2b07 sp 00007ffd19181278 error 6 in 
libmate-menu.so.2.4.9[7fefaf1cf000+d000]
Oct 20 19:08:13 ThinkPad-T460s kernel: [ 4398.269150] Code: da fe ff ff e8 8a 
d6 ff ff 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 89 f8 f0 83 07 01 c3 0f 
1f 40 00 f3 0f 1e fa 48 89 f8 <f0> 83 07 01 c3 0f 1f 40 00 f3 0f 1e fa f0 83 2f 
01 74 06 c3 0f 1f
Oct 20 19:08:13 ThinkPad-T460s systemd[1]: Starting Process error reports when 
automatic reporting is enabled...
Oct 20 19:08:15 ThinkPad-T460s mate-session[2434]: WARNING: Detected that 
screensaver has left the bus
Oct 20 19:08:15 ThinkPad-T460s dbus-daemon[2431]: [session uid=1001 pid=2431] 
Activating service name='org.mate.ScreenSaver' requested by ':1.55' (uid=1001 
pid=2892 comm="mate-power-manager " label="unconfined")
Oct 20 19:08:15 ThinkPad-T460s dbus-daemon[2431]: [session uid=1001 pid=2431] 
Successfully activated service 'org.mate.ScreenSaver'

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: libmate-menu2 1.26.0-0ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-20.20-generic 5.13.14
Uname: Linux 5.13.0-20-generic x86_64
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: MATE
Date: Thu Oct 21 07:31:01 2021
InstallationDate: Installed on 2016-07-23 (1915 days ago)
InstallationMedia: Ubuntu-MATE 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
SourcePackage: mate-menus
UpgradeStatus: Upgraded to impish on 2021-10-14 (6 days ago)

** Affects: mate-menus (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug impish

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https://bugs.launchpad.net/bugs/1948031

Title:
  Screensaver SegFault (libmate-menu & mate-screensaver)

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