Doesn't seem to be fixed in Focal (deploying Masakari Charm on Openstack with Juju 2.9.5) :

Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [MAIN  ] Corosync Cluster Engine 3.0.3 starting up
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync info    [MAIN  ] Corosync built-in features: dbus monitoring watchdog augeas systemd xmlconf vqsim nozzle snmp pie relro bindnow
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync warning [MAIN  ] Could not set SCHED_RR at priority 99: Operation not permitted (1)
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync warning [MAIN  ] Could not set priority -2147483648: Permission denied (13)
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync warning [MAIN  ] Could not increase RLIMIT_MEMLOCK, not locking memory: Operation not permitted (1)
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [TOTEM ] Initializing transport (Kronosnet).
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync warning [TOTEM ] knet_handle_new failed, trying unprivileged: File name too long (36)
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync info    [TOTEM ] totemknet initialized
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via force option 33: Operation not permitted
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Unable to set local socketpair receive buffer: File name too long
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] handle: Unable to initialize internal hostsockpair: File name too long
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 8 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 7 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 8 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 7 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 8 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 7 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 8 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 7 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 8 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 7 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 8 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 7 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 8 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 7 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 8 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 7 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 8 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 7 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 8 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Failed to set socket buffer via option 7 to value 8388608: capped at 425984
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync error   [KNET  ] transport: Continuing regardless, as the handle is not privileged. Expect poor performance!
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine loaded: corosync configuration map access [0]
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync info    [QB    ] server name: cmap
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine loaded: corosync configuration service [1]
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync info    [QB    ] server name: cfg
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine loaded: corosync cluster closed process group service v1.01 [2]
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync info    [QB    ] server name: cpg
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine loaded: corosync profile loading service [4]
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine loaded: corosync resource monitoring service [6]
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync warning [WD    ] Watchdog not enabled by configuration
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync warning [WD    ] resource load_15min missing a recovery key.
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync warning [WD    ] resource memory_used missing a recovery key.
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync info    [WD    ] no resources configured.
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine loaded: corosync watchdog service [7]
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [QUORUM] Using quorum provider corosync_votequorum
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [QUORUM] This node is within the primary component and will provide service.
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [QUORUM] Members[0]:
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine loaded: corosync vote quorum service v1.0 [5]
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync info    [QB    ] server name: votequorum
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine loaded: corosync cluster quorum service v0.1 [3]
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync info    [QB    ] server name: quorum
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [TOTEM ] A new membership (1.5) was formed. Members joined: 1
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync warning [CPG   ] downlist left_list: 0 received
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [QUORUM] Members[1]: 1
Jul 05 13:15:57 [15946] juju-97b917-3-lxd-3 corosync notice  [MAIN  ] Completed service synchronization, ready to provide service.
Jul 05 13:16:06 [15946] juju-97b917-3-lxd-3 corosync warning [MAIN  ] Corosync main process was not scheduled for 902.3224 ms (threshold is 800.0000 ms). Consider token timeout increase.
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync notice  [MAIN  ] Node was shut down by a signal
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Unloading all Corosync service engines.
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync info    [QB    ] withdrawing server sockets
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine unloaded: corosync vote quorum service v1.0
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync info    [QB    ] withdrawing server sockets
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine unloaded: corosync configuration map access
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync info    [QB    ] withdrawing server sockets
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine unloaded: corosync configuration service
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync info    [QB    ] withdrawing server sockets
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine unloaded: corosync cluster closed process group service v1.01
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync info    [QB    ] withdrawing server sockets
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine unloaded: corosync cluster quorum service v0.1
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine unloaded: corosync profile loading service
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine unloaded: corosync resource monitoring service
Jul 05 13:19:33 [15946] juju-97b917-3-lxd-3 corosync notice  [SERV  ] Service engine unloaded: corosync watchdog service
Jul 05 13:19:34 [15946] juju-97b917-3-lxd-3 corosync notice  [MAIN  ] Corosync Cluster Engine exiting normally