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

---------------
lttng-modules (2.12.2-1ubuntu1) groovy; urgency=medium

  * fix build bug with kernel 5.8. (LP: #1896077)

 -- Andrea Righi <andrea.righi@xxxxxxxxxxxxx>  Wed, 16 Sep 2020 14:26:51
+0000

** Changed in: lttng-modules (Ubuntu Groovy)
       Status: New => 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 Groovy:
  Fix Released

Bug description:
  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.

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