systemd-timesyncd服务被终止且无法查询到的故障排查求助

各位好，我碰到了一个棘手的问题：systemd-timesyncd服务被终止后，现在连服务单元都找不到了，想请大家帮忙分析排查一下。下面是我整理的详细情况：

安装情况 #

我确认已经安装了systemd-timesyncd，执行安装命令时系统提示它已经是最新版本：

$ sudo apt -y install systemd-timesyncd
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
systemd-timesyncd is already the newest version (249.11-0ubuntu3.11pop0~1704473387~22.04~3ce38bf).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

服务状态异常 #

但当我尝试查看服务状态时，系统提示找不到该服务单元：

$ sudo systemctl status systemd-timesyncd
Unit systemd-timesyncd.service could not be found.

从日志来看，这个服务似乎被强制终止了，但我不清楚具体原因。

日志中的关键信息 #

我通过journalctl查看了服务的日志，发现是watchdog超时导致服务被终止，相关日志内容如下：

$ sudo journalctl -fu systemd-timesyncd.service
Jul 31 09:31:40 pop-os systemd-timesyncd[602]: Initial synchronization to time server 185.125.190.56:123 (ntp.ubuntu.com).
-- Boot 67e30f40b57c4eadae6ed5a5b4df8c13 --
Jul 31 09:35:32 pop-os systemd[1]: Starting Network Time Synchronization...
Jul 31 09:35:33 pop-os systemd[1]: Started Network Time Synchronization.
Jul 31 09:36:03 pop-os systemd-timesyncd[660]: Initial synchronization to time server 185.125.190.56:123 (ntp.ubuntu.com).
Jul 31 09:40:53 pop-os systemd[1]: systemd-timesyncd.service: Current command vanished from the unit file, execution of the command list won't be resumed.
Jul 31 09:41:42 pop-os systemd[1]: systemd-timesyncd.service: Got notification message from PID 660, but reception is disabled.
Jul 31 09:42:42 pop-os systemd[1]: systemd-timesyncd.service: Watchdog timeout (limit 3min)!
Jul 31 09:42:42 pop-os systemd[1]: systemd-timesyncd.service: Killing process 660 (systemd-timesyn) with signal SIGABRT.
Jul 31 09:42:43 pop-os systemd[1]: systemd-timesyncd.service: Main process exited, code=dumped, status=6/ABRT
Jul 31 09:42:43 pop-os systemd[1]: systemd-timesyncd.service: Failed with result 'watchdog'.

timedatectl输出情况 #

timedatectl命令可以正常运行，输出显示NTP服务标记为active，但系统时钟并未同步：

$ timedatectl
Local time: Wed 2024-01-17 15:00:42 AEDT
Universal time: Wed 2024-01-17 04:00:42 UTC
RTC time: Wed 2024-01-17 04:00:42
Time zone: Australia/Sydney (AEDT, +1100)
System clock synchronized: no
NTP service: active
RTC in local TZ: no

系统环境 #

我使用的操作系统是Pop!_OS 22.04 LTS，具体信息如下：

$ cat /etc/os-release
NAME="Pop!_OS"
VERSION="22.04 LTS"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 22.04 LTS"

更新补充 #

根据@paradin的提示，我发现我的系统实际上正在使用Chrony作为NTP客户端，而不是systemd-timesyncd。

备注：内容来源于stack exchange，提问作者mon