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[Po-Hsu Lin <1986921@xxxxxxxxxxxxxxxxxx>]

Spotted on X-hwe 4.15.0-194.205~16.04.1

 /var/lib/dkms/lttng-modules/2.8.0/build/probes/lttng-probe-random.c:31:33: fatal error: trace/events/random.h: No such file or directory 
 compilation terminated.
 scripts/Makefile.build:340: recipe for target '/var/lib/dkms/lttng-modules/2.8.0/build/probes/lttng-probe-random.o' failed
 make[2]: *** [/var/lib/dkms/lttng-modules/2.8.0/build/probes/lttng-probe-random.o] Error 1
 scripts/Makefile.build:607: recipe for target '/var/lib/dkms/lttng-modules/2.8.0/build/probes' failed
 make[1]: *** [/var/lib/dkms/lttng-modules/2.8.0/build/probes] Error 2
 Makefile:1590: recipe for target '_module_/var/lib/dkms/lttng-modules/2.8.0/build' failed
 make: *** [_module_/var/lib/dkms/lttng-modules/2.8.0/build] Error 2
 make: Leaving directory '/usr/src/linux-headers-4.15.0-194-generic'


** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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

** Changed in: linux (Ubuntu Xenial)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1986921

Title:
  lttng-modules/2.13.1-1 ADT test failure with linux/5.15.0-47.51

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Won't Fix
Status in lttng-modules package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Confirmed
Status in lttng-modules source package in Xenial:
  New
Status in linux source package in Bionic:
  Won't Fix
Status in lttng-modules source package in Bionic:
  Fix Released
Status in linux source package in Focal:
  Won't Fix
Status in lttng-modules source package in Focal:
  Fix Released
Status in linux source package in Jammy:
  Won't Fix
Status in lttng-modules source package in Jammy:
  Fix Released

Bug description:
  SRU Justification:

  Impact: The kernel upstream changed in v5.18 and dropped tracepoints
  for random. This change was backported to 5.15/jammy in upstream
  stable 5.15.44. With that the build of lttng-modules-dkms fails.

  Fix: Backport of an upstream change which checks for the kernel header file which got removed in the process. Additionally the DKMS spec file has to do the same check to
  be aware of the missing probe module.

  Testcase: Installing lttng-modules-dkms for a kernel < 5.15.0-47 and
  -47 or later. Currently -47 and later will fail. With the change both
  should complete.

  Regression Potential: This changes whether lttng-probe-random.ko is
  available or not (if it is available the code is unchanged). User-
  space might be affected if this module is always expected.

  ---

  This is a scripted bug report about ADT failures while running lttng-
  modules tests for linux/5.15.0-47.51 on jammy. Whether this is caused
  by the dep8 tests of the tested source or the kernel has yet to be
  determined.

  Testing failed on:
      amd64: https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/amd64/l/lttng-modules/20220817_074711_55044@/log.gz
      arm64: https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/arm64/l/lttng-modules/20220817_075639_1a4d1@/log.gz
      ppc64el: https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/ppc64el/l/lttng-modules/20220817_074544_d2849@/log.gz
      s390x: https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/s390x/l/lttng-modules/20220817_075106_d2849@/log.gz

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