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This bug was fixed in the package ardour3 - 3.5.403~dfsg-3~ubuntu14.04.1

---------------
ardour3 (3.5.403~dfsg-3~ubuntu14.04.1) trusty; urgency=medium

  * No-change backport to trusty (LP: #1450992)

ardour3 (3.5.403~dfsg-3) unstable; urgency=medium

  * Fix MIDI data loss when editing (Closes: #772118)

ardour3 (3.5.403~dfsg-2) unstable; urgency=high

  * Reupload with waf fixes from 3.5.380~dfsg-2 and -3

ardour3 (3.5.403~dfsg-1) unstable; urgency=high

  * Imported Upstream version 3.5.403~dfsg
  * Critical bugfix release. All users are recommended to upgrade.
  * Details: https://community.ardour.org/node/8457

ardour3 (3.5.380~dfsg-3) unstable; urgency=medium

  * Prevent build failures in slower architectures by
    forcing waf logging to stdout instead of stderr.

ardour3 (3.5.380~dfsg-2) unstable; urgency=medium

  * Team upload.
  * Pass correct -j flag to waf. Closes: #748584

ardour3 (3.5.380~dfsg-1) unstable; urgency=low

  * Imported Upstream version 3.5.380~dfsg

ardour3 (3.5.357~dfsg-1) unstable; urgency=high

  * Imported Upstream version 3.5.357~dfsg
  * Critical bugfix release. All users are recommended to upgrade.
  * Details: https://community.ardour.org/node/8015

 -- Micah Gersten <micahg@xxxxxxxxxx>  Sun, 03 May 2015 15:03:18 -0500

** Changed in: ardour3 (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1450992

Title:
  audio and MIDI files irreversibly deleted from disk

Status in ardour3 package in Ubuntu:
  Invalid
Status in ardour3 source package in Trusty:
  Fix Released
Status in ardour3 source package in Utopic:
  Fix Committed

Bug description:
  [Impact]

  Unfortunately I do not have any hard data on this. I can only quote
  the ardour development team on the last release of ardour3:

  "Ardour 3.5.403 is (yet another) CRITICAL bug fix release. ALL USERS
  ARE RECOMMENDED TO UPGRADE. Additionally, ALL LINUX DISTRIBUTIONS
  SHOULD IMMEDIATELY UPGRADE/UPDATE TO THIS RELEASE. Distributing
  earlier versions of 3.5 at this point is irresponsible and risks our
  users' data.

  As with 3.5.380, this release includes several more absolutely vital
  fixes for bugs could lead to audio and MIDI files being irreversibly
  deleted from disk.

  We still do not know precisely how these losses happened - no user
  ever found a reliable recipe to recreate all of them - but reports
  from several different users did lead to a careful code review which
  uncovered some potential for file loss. "

  source: http://ardour.org/news/3.5.older.html

  [Test Case]

  Since reproducing seemed difficult, I never tried. I can only refer to
  the quote above.

  [Regression Potential]

  Regression potential should be small. This is not a major update. The
  update I am proposing (ardour3 in vivid) is also the last update ever
  for ardour3, since ardour4 is now out.

  NOTE TO SRU TEAM:
  A backport SRU was chosen since the only packaging changes were to parallelize the build, fix slow arches timing out, and one more data loss bug.  There are no reverse dependencies (just the Ubuntu Studio meta package) and this gets us in sync with jessie.

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