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[Launchpad Bug Tracker <1896077@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package lttng-modules -
2.12.2-1ubuntu1~20.04.1

---------------
lttng-modules (2.12.2-1ubuntu1~20.04.1) focal; urgency=medium

  [ Andrea Righi ]
  * Fix build bug with kernel 5.8. (LP: #1896077).

  * Use the Groovy version of lttng-modules with Focal.

 -- Khalid Elmously <khalid.elmously@xxxxxxxxxxxxx>  Tue, 11 Nov 2020
00:26:51 -0500

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

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https://bugs.launchpad.net/bugs/1896077

Title:
  lttng-modules-dkms ADT test failure: build error with kernel >= 5.8

Status in lttng-modules package in Ubuntu:
  Fix Released
Status in lttng-modules source package in Focal:
  Fix Released
Status in lttng-modules source package in Groovy:
  Fix Released

Bug description:
  [Impact]

  lttng-modules-dkms cannot be built anymore with kernels >= 5.8
  (groovy).

  The error reported is the following:

  In file included from /var/lib/dkms/lttng-modules/2.12.2/build/probes/../probes/define_trace.h:87,
                   from /var/lib/dkms/lttng-modules/2.12.2/build/probes/../instrumentation/events/lttng-module/writeback.h:755,
                   from /var/lib/dkms/lttng-modules/2.12.2/build/probes/lttng-probe-writeback.c:38:
  /var/lib/dkms/lttng-modules/2.12.2/build/probes/../probes/lttng-tracepoint-event-impl.h:131:6: error: conflicting types for ‘trace_writeback_queue_io’

  The fix is already available in the upstream git repository.

  [Test case]

  Build the dkms package on a >= 5.8 kernel.

  [Where problems could occur]

  The upstream lttng-modules project is compatible and buildable on all
  >3.0 kernels. The new lttng-modules 2.12.2 code should continue to
  function fine on the 5.4 kernel.

  I confirmed that the this latest package builds and loads without any
  errors or warnings on the 5.4 kernel.

  Therefore, it is more accurate to say there is a small potential for
  regression on the 5.4 kernel - and that would likely indicate an
  upstream bug in lttng-modules itself.

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