왜 "systemd[1]: [email protected]: 프로세스 종료"인지

최근에 Debian 9로 업그레이드한 일부 서버는 이제 매일 이상한 syslog 메시지를 생성합니다(logcheck를 통해 보고됨):

Oct 27 06:25:08 foo systemd[1]: [email protected]: Killing process 12270 (kill) with signal SIGKILL.

시간은 cron.daily 인 것 같고 서비스 이름도 no one/no group 의 UID 처럼 보이는데 왜 죽고 애초에 뭐하는 걸까요?

그 당시에는 더 많은 syslog 라인이 있었습니다. 이 블록은 여러 번 반복됩니다.

Oct 27 06:25:08 svn systemd[1]: Created slice User Slice of nobody.
Oct 27 06:25:08 svn systemd[1]: Starting User Manager for UID 65534...
Oct 27 06:25:08 svn systemd[1]: Started Session 1377 of user nobody.
Oct 27 06:25:08 svn systemd[12264]: Reached target Paths.
Oct 27 06:25:08 svn systemd[12264]: Listening on GnuPG cryptographic agent (access for web browsers).
Oct 27 06:25:08 svn systemd[12264]: Listening on GnuPG network certificate management daemon.
Oct 27 06:25:08 svn systemd[12264]: Reached target Timers.
Oct 27 06:25:08 svn systemd[12264]: Listening on GnuPG cryptographic agent and passphrase cache (restricted).
Oct 27 06:25:08 svn systemd[12264]: Listening on GnuPG cryptographic agent (ssh-agent emulation).
Oct 27 06:25:08 svn systemd[12264]: Listening on GnuPG cryptographic agent and passphrase cache.
Oct 27 06:25:08 svn systemd[12264]: Reached target Sockets.
Oct 27 06:25:08 svn systemd[12264]: Reached target Basic System.
Oct 27 06:25:08 svn systemd[12264]: Reached target Default.
Oct 27 06:25:08 svn systemd[12264]: Startup finished in 12ms.
Oct 27 06:25:08 svn systemd[1]: Started User Manager for UID 65534.
Oct 27 06:25:08 svn systemd[1]: Stopping User Manager for UID 65534...
Oct 27 06:25:08 svn systemd[12264]: Stopped target Default.
Oct 27 06:25:08 svn systemd[12264]: Stopped target Basic System.
Oct 27 06:25:08 svn systemd[12264]: Stopped target Sockets.
Oct 27 06:25:08 svn systemd[12264]: Closed GnuPG cryptographic agent and passphrase cache.
Oct 27 06:25:08 svn systemd[12264]: Closed GnuPG network certificate management daemon.
Oct 27 06:25:08 svn systemd[12264]: Closed GnuPG cryptographic agent (access for web browsers).
Oct 27 06:25:08 svn systemd[12264]: Closed GnuPG cryptographic agent and passphrase cache (restricted).
Oct 27 06:25:08 svn systemd[12264]: Closed GnuPG cryptographic agent (ssh-agent emulation).
Oct 27 06:25:08 svn systemd[12264]: Reached target Shutdown.
Oct 27 06:25:08 svn systemd[12264]: Starting Exit the Session...
Oct 27 06:25:08 svn systemd[12264]: Stopped target Timers.
Oct 27 06:25:08 svn systemd[12264]: Stopped target Paths.
Oct 27 06:25:08 svn systemd[12264]: Received SIGRTMIN+24 from PID 12270 (kill).
Oct 27 06:25:08 svn systemd[1]: [email protected]: Killing process 12270 (kill) with signal SIGKILL.
Oct 27 06:25:08 svn systemd[1]: Stopped User Manager for UID 65534.
Oct 27 06:25:08 svn systemd[1]: Removed slice User Slice of nobody.
Oct 27 06:25:08 svn systemd[1]: Created slice User Slice of nobody.

PID 12264 syslog/syslog.1에 더 이상 항목이 없습니다.