[Bug 711321] [NEW] multipathd expecting wrong paths in uevents

[Serge Hallyn]

Public bug reported:

Binary package hint: multipath-tools

multipathd is looking for the wrong paths in uevents, causing it to miss
when paths go down.  This has been fixed upstream for awhile, and is
fixed in Natty.  The fix needs to be backported to Lucid and Maverick.


SRU Justification:
1. Impact: multipath fail-over events are not handled by multipathd. The system therefore does not cleanly survive FOFB.
2. How addressed: a bug from upstream is cherry-picked which fixes multipathd to look for the correct device pathnames in uevents it sees.
3. Patch: see debdiff attached
4. To reproduce: Start multipathd with -v4 argument. Reset an SCM to initiate FOFB. Watch /var/log/daemon.log for uevents relating to drives. Without the patch they don't show up. Additionally, upon failback, new block device names will be used (i.e. /dev/sdo instead of /dev/sda).
5. Regression potential: the patch is to multipathd, so non-multipath users will not be affected. Multipathd users with an older kernel which uses the old pathanames could get the same behavior which uptodate users now have without this patch.

** Affects: multipath-tools (Ubuntu)
     Importance: High
     Assignee: Serge Hallyn (serge-hallyn)
         Status: Fix Released

** Changed in: multipath-tools (Ubuntu)
       Status: New => Fix Released

** Changed in: multipath-tools (Ubuntu)
     Assignee: (unassigned) => Serge Hallyn (serge-hallyn)

** Changed in: multipath-tools (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/711321

Title:
  multipathd expecting wrong paths in uevents