unexplained crash

From	Adam Weremczuk <adamw@matrixscience.com>
Newsgroups	linux.debian.user
Subject	unexplained crash
Date	2023-11-17 20:30 +0100
Message-ID	<HBcHn-67YP-5@gated-at.bofh.it> (permalink)
Organization	Matrix Science Ltd

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Hello,

Yesterday SSH on my desktop PC running Ubuntu 20.04 became unresponsive.

The machine was responding to ping and "telnet 22" was briefly 
connecting before connection closed.

The graphical login prompt was visible, but when I tried to log in, it 
threw me to the text console. No login prompt on any virtual consoles 
and Ctrl-Alt-Del did nothing.

There is no information logged in wtmp, kern.log and dmesg. Nothing 
interesting in auth.log

The last 40 lines from syslog look as below:

Nov 16 17:04:23 ubu20 systemd[1]: session-5089.scope: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1]: Stopping User Manager for UID 0...
Nov 16 17:04:33 ubu20 systemd[1259208]: Stopped target Main User Target.
Nov 16 17:04:33 ubu20 systemd[1259208]: Stopped target Basic System.
Nov 16 17:04:33 ubu20 systemd[1259208]: Stopped target Paths.
Nov 16 17:04:33 ubu20 systemd[1259208]: ubuntu-report.path: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1259208]: Stopped Pending report trigger 
for Ubuntu Report.
Nov 16 17:04:33 ubu20 systemd[1259208]: Stopped target Sockets.
Nov 16 17:04:33 ubu20 systemd[1259208]: Stopped target Timers.
Nov 16 17:04:33 ubu20 systemd[1259208]: dbus.socket: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1259208]: Closed D-Bus User Message Bus 
Socket.
Nov 16 17:04:33 ubu20 systemd[1259208]: dirmngr.socket: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1259208]: Closed GnuPG network certificate 
management daemon.
Nov 16 17:04:33 ubu20 systemd[1259208]: gpg-agent-browser.socket: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1259208]: Closed GnuPG cryptographic agent 
and passphrase cache (access for web browsers).
Nov 16 17:04:33 ubu20 systemd[1259208]: gpg-agent-extra.socket: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1259208]: Closed GnuPG cryptographic agent 
and passphrase cache (restricted).
Nov 16 17:04:33 ubu20 systemd[1259208]: gpg-agent-ssh.socket: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1259208]: Closed GnuPG cryptographic agent 
(ssh-agent emulation).
Nov 16 17:04:33 ubu20 systemd[1259208]: gpg-agent.socket: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1259208]: Closed GnuPG cryptographic agent 
and passphrase cache.
Nov 16 17:04:33 ubu20 systemd[1259208]: pk-debconf-helper.socket: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1259208]: Closed debconf communication socket.
Nov 16 17:04:33 ubu20 systemd[1259208]: snapd.session-agent.socket: 
Succeeded.
Nov 16 17:04:33 ubu20 systemd[1259208]: Closed REST API socket for snapd 
user session agent.
Nov 16 17:04:33 ubu20 systemd[1259208]: Reached target Shutdown.
Nov 16 17:04:33 ubu20 systemd[1259208]: systemd-exit.service: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1259208]: Finished Exit the Session.
Nov 16 17:04:33 ubu20 systemd[1259208]: Reached target Exit the Session.
Nov 16 17:04:33 ubu20 systemd[1]: user@0.service: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1]: Stopped User Manager for UID 0.
Nov 16 17:04:33 ubu20 systemd[1]: Stopping User Runtime Directory 
/run/user/0...
Nov 16 17:04:33 ubu20 systemd[2567]: run-user-0.mount: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1294]: run-user-0.mount: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1]: run-user-0.mount: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1]: user-runtime-dir@0.service: Succeeded.
Nov 16 17:04:33 ubu20 systemd[1]: Stopped User Runtime Directory 
/run/user/0.
Nov 16 17:04:33 ubu20 systemd[1]: Removed slice User Slice of UID 0.

Does anybody have an idea what could have happened?

Regards,
Adam

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Thread

unexplained crash Adam Weremczuk <adamw@matrixscience.com> - 2023-11-17 20:30 +0100
  Re: unexplained crash <tomas@tuxteam.de> - 2023-11-18 07:10 +0100
    Re: unexplained crash David Wright <deblis@lionunicorn.co.uk> - 2023-11-18 07:30 +0100
  Re: unexplained crash Jeffrey Walton <noloader@gmail.com> - 2023-11-18 07:40 +0100
    Re: unexplained crash on Ubuntu 20.04 system Michael Kjörling <2695bd53d63c@ewoof.net> - 2023-11-18 13:10 +0100

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