What is the meaning of "Requested transaction contains an unfixable cyclic ordering dependency"?

Solution Verified - Updated -

Issue

  • What is the meaning of "Requested transaction contains an unfixable cyclic ordering dependency"?
  • Why do I see the following in logs when trying to start a service with systemd?
Dec 18 10:27:42 rhel7u2a systemd: Found ordering cycle on sleeper2.service/start
Dec 18 10:27:42 rhel7u2a systemd: Found dependency on sleeper1.service/start
Dec 18 10:27:42 rhel7u2a systemd: Found dependency on sleeper2.service/start
Dec 18 10:27:42 rhel7u2a systemd: Unable to break cycle
Dec 18 10:27:42 rhel7u2a systemd: Requested transaction contains an unfixable cyclic ordering dependency: Transaction order is cyclic. See system logs for details.
Dec 18 10:28:08 rhel7u2a systemd: Starting Cleanup of Temporary Directories...
Dec 18 10:28:08 rhel7u2a systemd: Started Cleanup of Temporary Directories.

Environment

  • Red Hat Enterprise Linux (RHEL) 7
  • systemd

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