** Also affects: lttng-modules (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Also affects: lttng-modules (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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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:
  Incomplete
Status in lttng-modules source package in Xenial:
  New
Status in lttng-modules source package in Artful:
  New

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/lttng-modules/+bug/1739591/+subscriptions

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