[Bug 1647067] [NEW] Dangling UDEV links after removing FC LUNs

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We're using Q-Logic QLE2562 Fibre Channel adapters (qla2xxx driver)
against a HPE 3PAR 7400c storage array in an OpenStack environment. The
OpenStack 3PAR driver manages volume attachments from the array to the
servers. There is 4 path multipath to every volume.

As the LUNs are removed, sometimes udev does not remove all links,
particularly in /run/udev/links and /dev/disk/by-path. The symptoms are
multiple records in one by-path directory under /run/udev/links, broken
links to no longer attached luns in dev/disk/by-path and links between
wrong LUNs and scsi devices there.

OpenStack relies on these links. When another volume is attached using a
LUN that has these leftover links and it happens that it is the first of
the 4 paths, OpenStack incorrectly identifies the volume and attaches
the same volume to multiple instances, leading to data loss.

What could be causing this behavior?

Ubuntu version 14.04 
Linux version Ubuntu 4.4.0-47.68~14.04.1-generic 4.4.24
udev 204-5ubuntu20.19

** Affects: udev (Ubuntu)
     Importance: Undecided
         Status: New

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Dangling UDEV links after removing FC LUNs
https://bugs.launchpad.net/bugs/1647067
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