Problem after update - v8.4.4 - Ub24.04

[Domiziano-R]

After an update in ubuntu 24.04 i got a error when autostart ,
frr is enable on systemctl but i got this :

systemctl status frr
○ frr.service - FRRouting
Loaded: loaded (/usr/lib/systemd/system/frr.service; enabled; preset: enabled)
Active: inactive (dead) since Thu 2026-03-26 14:18:34 UTC; 6min ago
Duration: 18.285s
Docs: https://frrouting.readthedocs.io/en/latest/setup.html
Process: 1291 ExecStart=/usr/lib/frr/frrinit.sh start (code=exited, status=0/SUCCESS)
Process: 2441 ExecReload=/usr/lib/frr/frrinit.sh reload (code=exited, status=1/FAILURE)
Process: 2486 ExecStop=/usr/lib/frr/frrinit.sh stop (code=exited, status=0/SUCCESS)
Main PID: 1340 (code=exited, status=0/SUCCESS)
CPU: 430ms

i search in journal of ubuntu and i got this 👍

Mar 26 13:47:44 host_srv systemd[1]: Reloading frr.service - FRRouting...
Mar 26 13:47:44 host_srv watchfrr[1341]: [NG1AJ-FP2TQ] Terminating on signal
Mar 26 13:47:44 host_srv frrinit.sh[2393]: * Stopped watchfrr
Mar 26 13:47:44 host_srv frrinit.sh[2393]: * Starting watchfrr with command: ' /usr/lib/frr/watchfrr -d -F traditional zebra bgpd staticd bfdd'
Mar 26 13:47:44 host_srv watchfrr[2412]: [T83RR-8SM5G] watchfrr 8.4.4 starting: vty@0
Mar 26 13:47:44 host_srv watchfrr[2412]: [QDG3Y-BY5TN] zebra state -> up : connect succeeded
Mar 26 13:47:44 host_srv watchfrr[2412]: [QDG3Y-BY5TN] bgpd state -> up : connect succeeded
Mar 26 13:47:44 host_srv watchfrr[2412]: [QDG3Y-BY5TN] staticd state -> up : connect succeeded
Mar 26 13:47:44 host_srv watchfrr[2412]: [QDG3Y-BY5TN] bfdd state -> up : connect succeeded
Mar 26 13:47:44 host_srv watchfrr[2412]: [KWE5Q-QNGFC] all daemons up, doing startup-complete notify
Mar 26 13:47:44 host_srv frrinit.sh[2393]: * Started watchfrr
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:221: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: obj = re.match(sub_str + " (?P\S*)", line)
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:822: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: re_pg = re.match("neighbor (\S+) peer-group$", line)
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:845: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: pg_rmtas = "neighbor %s remote-as (\S+)" % pg_key
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:851: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: nb_pg = "neighbor (\S+) peer-group %s$" % pg_key
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:869: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: nbr_rmtas = "neighbor (\S+) remote-as.*"
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:899: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: re_nbr_pg = re.search("neighbor (\S+) .*peer-group (\S+)", line)
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:998: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: nb_remoteas = "neighbor (\S+) .*remote-as (\S+)"
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:1006: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: re_nbr_pg = re.search("neighbor (\S+) .peer-group (\S+)", line)
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:1018: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: re_pg = re.match("neighbor (\S+) peer-group$", line)
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:1044: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: nb_pg = "neighbor (\S+) .peer-group %s$" % pg_key
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:1127: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: "neighbor (\S+) interface peer-group (\S+)", line
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:1130: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: "neighbor (\S+) interface v6only peer-group (\S+)", line
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:1271: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: "neighbor (\S+) interface remote-as (\S+)", line
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:1274: SyntaxWarning: invalid escape sequence '\S'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: "neighbor (\S+) interface v6only remote-as (\S+)", line
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:1314: SyntaxWarning: invalid escape sequence '\s'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: "^bgp\s+bestpath\s+as-path\s+multipath-relax$", line
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:1339: SyntaxWarning: invalid escape sequence '\s'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: re_importtbl = re.search("^ip\s+import-table\s+(\d+)$", ctx_keys[0])
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:1360: SyntaxWarning: invalid escape sequence '\s'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: "^(ip |ipv6 |)(prefix-list|access-list)(\s+\S+\s+)(seq \d+\s+)(permit|deny)(.)$",
Mar 26 13:47:44 host_srv frrinit.sh[2431]: /usr/lib/frr/frr-reload.py:1393: SyntaxWarning: invalid escape sequence '\s'
Mar 26 13:47:44 host_srv frrinit.sh[2431]: "^(bgp )(community-list|large-community-list|extcommunity-list)(\s+\S+\s+)(\S+\s+)(seq \d+\s+)(permit|deny)(.)$",
Mar 26 13:47:44 host_srv frrinit.sh[2431]: vtysh failed to process new configuration: vtysh (mark file) exited with status 2:
Mar 26 13:47:44 host_srv frrinit.sh[2431]: b'line 50: % Unknown command: detect-multiplier 0\n\n'
Mar 26 13:47:44 host_srv systemd[1]: frr.service: Control process exited, code=exited, status=1/FAILURE
Mar 26 13:47:44 host_srv watchfrr[2412]: [NG1AJ-FP2TQ] Terminating on signal
Mar 26 13:47:44 host_srv frrinit.sh[2438]: * Stopped watchfrr
Mar 26 13:47:44 host_srv frrinit.sh[2466]: * Stopped bfdd
Mar 26 13:47:44 host_srv frrinit.sh[2468]: * Stopped bgpd
Mar 26 13:47:44 host_srv frrinit.sh[2467]: * Stopped staticd
Mar 26 13:47:44 host_srv frrinit.sh[2438]: * Stopped zebra
Mar 26 13:47:44 host_srv systemd[1]: frr.service: Deactivated successfully.

the odd behaviour is that when i start as service (systemctl start frr) is going to work...
i dont understand...

i check python on this server is 3.12 , is that correct ?