flashcache 3.1.3+git20150701-2ubuntu2 ADT test failure with linux-hwe 4.8.0-37.39~16.04.2

Module seems abandoned upstream[1] and the fixes to allow compilation which were made in Yakkety create no working module. Doing test setups "flashcache create -p back cdev1 <cache_dev> <backing_dev>" will create a /dev/mapper/cdev1 but trying to create an ext4 fs on it seems to write into the void. Nothing appears to be written.

Needs fixing before backporting.

[1] https://github.com/facebookarchive/flashcache/tree/master

Finally found out why nothing got written (see bug #1714185). Together with that it is safe to enable building on 4.8+ kernels.

Hello Andy, or anyone else affected,

Accepted flashcache into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/flashcache/3.1.3+git20150701-2ubuntu3 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed.Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-xenial to verification-done-xenial. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-xenial. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

With proposed enabled on a Xenial base VM:

~$ dpkg -l|grep flashcache
ii flashcache-dkms 3.1.3+git20150701-2ubuntu3 all write-back block device cache for Linux (DKMS version)
ii flashcache-utils 3.1.3+git20150701-2ubuntu3 amd64 write-back block device cache for Linux (user space utilities)

~$ dkms status
flashcache, 3.1.3+git20150701, 4.10.0-35-generic, x86_64: installed
flashcache, 3.1.3+git20150701, 4.13.0-11-generic, x86_64: installed
flashcache, 3.1.3+git20150701, 4.4.0-96-generic, x86_64: installed

This bug was fixed in the package flashcache - 3.1.3+git20150701-2ubuntu3

---------------
flashcache (3.1.3+git20150701-2ubuntu3) xenial; urgency=medium

  * Backport compat code for kernel 4.8 (LP: #1662108)
  * Initialize bi_op_flags in dm_io_request structures (LP: #1714185)
  * Fix DKMS compile for 4.13+ kernels (LP: #1706426)

 -- Stefan Bader <email address hidden> Mon, 06 Feb 2017 17:25:15 +0100

The verification of the Stable Release Update for flashcache has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.