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[Launchpad Bug Tracker <1878214@xxxxxxxxxxxxxxxxxx>]

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 <stefan.bader@xxxxxxxxxxxxx>  Tue, 12 May 2020 15:55:16
+0200

** Changed in: dahdi-linux (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1878214

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

Status in dahdi-linux package in Ubuntu:
  Invalid
Status in dahdi-linux source package in Xenial:
  Fix Released

Bug description:
  In upstream stable 4.4.218, the following patch brings back
  kref_read() which was re-implemented in dahdi-linux code for kernel
  versions before 4.11:

  commit 408f17931f5451702ad638e1d8511e780f6b56e7
  Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
  Date:   Mon Nov 14 17:29:48 2016 +0100

      locking/atomic, kref: Add kref_read()

  This needs adjustment now in Xenial for kernels including 4.4.218 and
  later.

  [SRU Justification]

  == Impact ==

  Dahdi-dkms fails to build for kernels which include upstream stable
  version 4.4.218 or later.

  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
  /autopkgtest-xenial/xenial/amd64/d/dahdi-
  linux/20200511_051631_1b525@/log.gz

  == Fix ==

  Disable the internal re-implementation of kref_read() for kernels
  including upstream stable 4.4.218.

  == Testcase ==

  Running dkms build for various kernel versions (tested with
  Ubuntu-4.4.0-178 and Ubuntu-4.4.0-179). With -178 building currently
  succeeds, with -179 it fails.

  == Risk of Regression ==

  Low, internal implementation which was backported from kernel 4.11
  gets replaced by the kernel function.

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