[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
--- 
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CustomUdevRuleFiles: 20-3par-unmap.rulez
DistroRelease: Ubuntu 14.04
InstallationDate: Installed on 2015-10-01 (429 days ago)
InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
MachineType: HP ProLiant DL380 Gen9
Package: udev 204-5ubuntu20.19
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-47-generic root=/dev/mapper/hostname--vg-root ro
ProcVersionSignature: Ubuntu 4.4.0-47.68~14.04.1-generic 4.4.24
Tags:  trusty
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
Uname: Linux 4.4.0-47-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
 
_MarkForUpload: True
dmi.bios.date: 11/03/2014
dmi.bios.vendor: HP
dmi.bios.version: P89
dmi.chassis.type: 23
dmi.chassis.vendor: HP
dmi.modalias: dmi:bvnHP:bvrP89:bd11/03/2014:svnHP:pnProLiantDL380Gen9:pvr:cvnHP:ct23:cvr:
dmi.product.name: ProLiant DL380 Gen9
dmi.sys.vendor: HP

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: apport-collected kernel-da-key trusty
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Dangling UDEV links after removing FC LUNs
https://bugs.launchpad.net/bugs/1647067
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