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[Launchpad Bug Tracker <1739591@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lttng-modules - 2.8.0-1ubuntu1~16.04.4

---------------
lttng-modules (2.8.0-1ubuntu1~16.04.4) xenial; urgency=medium

  * Fix builds on HWE 4.14 kernel (LP: #1739591)
    Apply the following upstream commits:
     0030-Fix-update-block-instrumentation-for-4.14-kernel.patch
     0031-Fix-update-writeback-instrumentation-for-kernel-4.14.patch
     0032-Update-kvm-instrumentation-for-4.15.patch
     0033-Fix-kvm-instrumentation-for-4.15.patch
     0034-Update-kvm-instrumentation-for-3.16.52-and-3.2.97.patch
     0035-Update-kvm-instrumentation-for-debian-kernel-4.9.65-.patch
     0036-Update-kvm-instrumentation-for-4.14.14-4.9.77-4.4.11.patch

 -- Colin Ian King <colin.king@xxxxxxxxxxxxx>  Tue, 6 Feb 2018 10:38:22
+0000

** Changed in: lttng-modules (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1739591

Title:
  lttng-modules-dkms failed to build with 4.14 Azure edge kernel on
  Xenial

Status in lttng-modules:
  New
Status in lttng-modules package in Ubuntu:
  Fix Released
Status in lttng-modules source package in Xenial:
  Fix Released
Status in lttng-modules source package in Artful:
  Fix Released

Bug description:
  SRU request, Xenial, Artful

  [Impact]

  lttng dkms modules fail to build against newer HWE kernels because of
  missing 4.14 compat fixes that allow it to build against newer 4.14
  kernels.

  [Fix]
  Upstream lttng 4.14 compat fixes.

  [Testcase]
  Without the fix, running the kernel team autotest lttng regression test suite fails because the module does not build and install.  With the fix the lttng smoke tests pass.

  To run the test:
  sudo autotest/client/autotest-local autotest/client/tests/ubuntu_lttng_smoke_test/control

  using git://kernel.ubuntu.com/ubuntu/autotest and
  git://kernel.ubuntu.com/ubuntu/autotest-client-tests

  [Regression Potential]
  lttng fails to build and work against older kernels. As the new code is #if'def'd compat code the 4.14 specific changes are not built into the older kernels, so this risk is small.

  --------------------------------------------------------------------------

  [stdout] Setting up lttng-modules-dkms (2.8.0-1ubuntu1~16.04.3) ...
   [stdout] Loading new lttng-modules-2.8.0 DKMS files...
   [stdout] First Installation: checking all kernels...
   [stdout] Building only for 4.14.0-1002-azure-edge
   [stdout] Building initial module for 4.14.0-1002-azure-edge
   [stdout] Error! Bad return status for module build on kernel: 4.14.0-1002-azure-edge (x86_64)
   [stdout] Consult /var/lib/dkms/lttng-modules/2.8.0/build/make.log for more information.

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