系统风扇突然特别大，到了100%。重启后恢复正常。
18.45看起来开始有问题，Stopping User Manager 是什么操作，我当时还没有执行重启。我是18.48发现的。
Sep 10 18:45:57 dell-poweredge-t640 systemd[1]: Stopping User Manager for UID 1000...
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Stopped target Default.
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Stopped target Basic System.
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Stopped target Paths.
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Stopped target Timers.
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Stopped target Sockets.
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Closed REST API socket for snapd user session agent.
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Closed GnuPG cryptographic agent and passphrase cache (access for web browsers).
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Closed GnuPG cryptographic agent and passphrase cache.
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Closed GnuPG network certificate management daemon.
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Closed GnuPG cryptographic agent and passphrase cache (restricted).
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Closed GnuPG cryptographic agent (ssh-agent emulation).
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Reached target Shutdown.
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Starting Exit the Session...
Sep 10 18:45:57 dell-poweredge-t640 systemd[21184]: Received SIGRTMIN+24 from PID 6491 (kill).
Sep 10 18:45:57 dell-poweredge-t640 systemd[1]: Stopped User Manager for UID 1000.
Sep 10 18:45:57 dell-poweredge-t640 systemd[1]: Removed slice User Slice of ycao.
Sep 10 18:51:45 dell-poweredge-t640 systemd-modules-load[658]: Inserted module 'iscsi_tcp'
Sep 10 18:51:45 dell-poweredge-t640 kernel: [ 0.000000] Linux version 4.15.0-156-generic (buildd@lcy01-amd64-008) (gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)) #163-Ubuntu SMP Thu Aug 19 23:31:58 UTC 2021 (Ubuntu 4.15.0-156.163-generic 4.15.18)
Sep 10 18:51:45 dell-poweredge-t640 kernel: [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-156-generic root=UUID=f7cdb27c-7bb6-4c41-853a-388c9db0bb40 ro
Sep 10 18:51:45 dell-poweredge-t640 systemd-modules-load[658]: Inserted module 'ib_iser'
Sep 10 18:51:45 dell-poweredge-t640 kernel: [ 0.000000] KERNEL supported cpus:
Sep 10 18:51:45 dell-poweredge-t640 kernel: [ 0.000000] Intel GenuineIntel
Sep 10 18:51:45 dell-poweredge-t640 kernel: [ 0.000000] AMD AuthenticAMD
Sep 10 18:51:45 dell-poweredge-t640 systemd[1]: Started Set the console keyboard layout.
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