[Xenial] dahdi-dkms fails to build after kernel version 4.4.218

Fix by disabling the internal definition of kref_read() for kernel versions >= 4.4.218.

Test build: https://launchpad.net/~smb/+archive/ubuntu/xenial/+packages

On a Xenial test VM with build-ppa enabled:

ubuntu@test-x1:~$ dkms status
dahdi, 2.10.2~dfsg-1ubuntu4, 4.4.0-178-generic, x86_64: installed
dahdi, 2.10.2~dfsg-1ubuntu4, 4.4.0-179-generic, x86_64: installed

Hello Stefan, or anyone else affected,

Accepted dahdi-linux into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/dahdi-linux/1:2.10.2~dfsg-1ubuntu4 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, what testing has been performed on the package 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, without details of your testing we will not be able to proceed.

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

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

All autopkgtests for the newly accepted dahdi-linux (1:2.10.2~dfsg-1ubuntu4) for xenial have finished running.
The following regressions have been reported in tests triggered by the package:

dahdi-linux/1:2.10.2~dfsg-1ubuntu4 (s390x)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/xenial/update_excuses.html#dahdi-linux

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

@sru-team: I checked the autopkgtest status for s390x and that looks like failing is the expected outcome for that arch (http://autopkgtest.ubuntu.com/packages/d/dahdi-linux/xenial/s390x). Could that hint be added (xenial/dahdi-linux on s390x expected to fail) to badtest? Thanks.

The s390x test, no got hinted as always failed. All other tests are either that or good. This verifies the update as well as it fixes a build issue which is done as part of ADT.

The verification of the Stable Release Update for dahdi-linux has completed successfully and the package is now being 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.

This bug was fixed in the package dahdi-linux - 1:2.10.2~dfsg-1ubuntu4

---------------
dahdi-linux (1:2.10.2~dfsg-1ubuntu4) xenial; urgency=medium

  * Linux 4.4.218 FTBS fix (LP: #1878214)
    - d/p/kernel-compat-4.4.218.patch

 -- Stefan Bader <email address hidden> Tue, 12 May 2020 15:55:16 +0200