Race in mdadm udev timer rules

Solution Unverified - Updated -

Issue

  • Issues with mdadm activation at boot. Below errors seen:

Sep 13 15:14:01 host systemd: Timed out stoppping /dev/md124. Sep 13 15:14:01 host systemd: Timed out stoppping /sys/devices/virtual/block/md124. Sep 13 15:14:01 host systemd: Timed out stoppping /dev/md/var. [...] Sep 13 15:12:31 host systemd: Starting system-mdadm\x2dlast\x2dresort.slice. Sep 13 15:12:31 host systemd: Starting Activate md array even though degraded... [...] Sep 28 03:29:26 host systemd[1]: Unmounting /var... Sep 28 03:29:26 host umount[2716]: umount: /var: target is busy. Sep 28 03:29:26 host umount[2716]: (In some cases useful info about processes that use Sep 28 03:29:26 host umount[2716]: the device is found by lsof(8) or fuser(1)) Sep 28 03:29:26 host systemd[1]: var.mount mount process exited, code=exited status=32

Environment

  • Red Hat Enterprise Linux 7

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