[Bug 789229] Re: using a blacklist and a blacklist_exception section results in multipathd filtering out paths it shouldn't

[Brian Murray]

The fix for this bug has been awaiting testing feedback in the -proposed
repository for lucid for more than 90 days.  Please test this fix and
update the bug appropriately with the results.  In the event that the
fix for this bug is still not verified 15 days from now, the package
will be removed from the -proposed repository.

** Changed in: multipath-tools (Ubuntu Natty)
       Status: In Progress => Won't Fix

** Tags added: removal-candidate

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https://bugs.launchpad.net/bugs/789229

Title:
  using a blacklist and a blacklist_exception section results in
  multipathd filtering out paths it shouldn't

Status in “multipath-tools” package in Ubuntu:
  Fix Released
Status in “multipath-tools” source package in Lucid:
  Fix Committed
Status in “multipath-tools” source package in Maverick:
  Invalid
Status in “multipath-tools” source package in Natty:
  Won't Fix

Bug description:
  Binary package hint: multipath-tools

  The issue is due to a bug in some if/then logic in
  blacklist.c:_filter_path resulting in the routine returning a value
  other then 0 for anything found on the exceptions list.

  SRU Justification:
  1. Impact: a config which (correctly) finds an entry both in blacklist and blacklist exceptions will not honor the exception
  2. How bug was addressed: an upstream fix was pulled in.  The root cause was that return values from functions checking existence in blacklists were being misinterpreted.
  3. Minimal patch: see debdiff in comment #6.
  4. TEST CASE: Create a multipath config with /dev/sda in both blacklist and blacklist exception.  /dev/sda won't be used.
  5. Regression potential: this commit has been upstream since 2007, so should cause no regressions.

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