Public bug reported:

There was once a build issue in bug 1756240, fixed with 2.8.0-1ubuntu1~16.04.5
Here is another one spotted on xenial-hwe-edge kernel:

DKMS make.log for lttng-modules-2.8.0 for kernel 4.15.0-15-lowlatency (x86_64)
Fri Apr 20 10:41:30 UTC 2018
make: Entering directory '/usr/src/linux-headers-4.15.0-15-lowlatency'
Makefile:976: "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, 
libelf-devel or elfutils-libelf-devel"
  CC [M]  
/var/lib/dkms/lttng-modules/2.8.0/build/lttng-ring-buffer-client-discard.o
In file included from 
/var/lib/dkms/lttng-modules/2.8.0/build/lttng-tracer.h:37:0,
                 from 
/var/lib/dkms/lttng-modules/2.8.0/build/lttng-ring-buffer-client-discard.c:24:
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/trace-clock.h: In function 
‘trace_clock_read64’:
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/trace-clock.h:195:34: error: 
implicit declaration of function ‘ACCESS_ONCE’ 
[-Werror=implicit-function-declaration]
  struct lttng_trace_clock *ltc = ACCESS_ONCE(lttng_trace_clock);
                                  ^
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/trace-clock.h:195:34: warning: 
initialization makes pointer from integer without a cast [-Wint-conversion]
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/trace-clock.h: In function 
‘trace_clock_freq’:
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/trace-clock.h:207:34: warning: 
initialization makes pointer from integer without a cast [-Wint-conversion]
  struct lttng_trace_clock *ltc = ACCESS_ONCE(lttng_trace_clock);
                                  ^
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/trace-clock.h: In function 
‘trace_clock_uuid’:
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/trace-clock.h:219:34: warning: 
initialization makes pointer from integer without a cast [-Wint-conversion]
  struct lttng_trace_clock *ltc = ACCESS_ONCE(lttng_trace_clock);
                                  ^
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/trace-clock.h: In function 
‘trace_clock_name’:
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/trace-clock.h:232:34: warning: 
initialization makes pointer from integer without a cast [-Wint-conversion]
  struct lttng_trace_clock *ltc = ACCESS_ONCE(lttng_trace_clock);
                                  ^
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/trace-clock.h: In function 
‘trace_clock_description’:
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/trace-clock.h:244:34: warning: 
initialization makes pointer from integer without a cast [-Wint-conversion]
  struct lttng_trace_clock *ltc = ACCESS_ONCE(lttng_trace_clock);
                                  ^
In file included from 
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/ringbuffer/backend_internal.h:2:0,
                 from 
/var/lib/dkms/lttng-modules/2.8.0/build/lib/ringbuffer/backend.h:40,
                 from 
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/ringbuffer/backend.h:1,
                 from 
/var/lib/dkms/lttng-modules/2.8.0/build/lib/ringbuffer/api.h:26,
                 from 
/var/lib/dkms/lttng-modules/2.8.0/build/wrapper/ringbuffer/api.h:1,
                 from 
/var/lib/dkms/lttng-modules/2.8.0/build/lttng-ring-buffer-client.h:180,
                 from 
/var/lib/dkms/lttng-modules/2.8.0/build/lttng-ring-buffer-client-discard.c:29:
/var/lib/dkms/lttng-modules/2.8.0/build/lib/ringbuffer/backend_internal.h: In 
function ‘subbuffer_id_set_noref_offset’:
/var/lib/dkms/lttng-modules/2.8.0/build/lib/ringbuffer/backend_internal.h:174:20:
 error: lvalue required as left operand of assignment
   ACCESS_ONCE(*id) = tmp;
                    ^
cc1: some warnings being treated as errors
scripts/Makefile.build:339: recipe for target 
'/var/lib/dkms/lttng-modules/2.8.0/build/lttng-ring-buffer-client-discard.o' 
failed
make[1]: *** 
[/var/lib/dkms/lttng-modules/2.8.0/build/lttng-ring-buffer-client-discard.o] 
Error 1
Makefile:1552: 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-4.15.0-15-lowlatency'


$ dpkg -l lttng-modules-dkms
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                            Version              Architecture         
Description
+++-===============================-====================-====================-====================================================================
ii  lttng-modules-dkms              2.8.0-1ubuntu1~16.04 all                  
Linux Trace Toolkit (LTTng) kernel modules (DKMS)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.15.0-15-lowlatency 4.15.0-15.16~16.04.1
ProcVersionSignature: User Name 4.15.0-15.16~16.04.1-lowlatency 4.15.15
Uname: Linux 4.15.0-15-lowlatency x86_64
ApportVersion: 2.20.1-0ubuntu2.16
Architecture: amd64
Date: Fri Apr 20 10:43:20 2018
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-hwe-edge
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-hwe-edge (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug package-from-proposed uec-images xenial

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

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https://bugs.launchpad.net/bugs/1765673

Title:
  Unable to build lttng module on 4.15 X-HWE-Edge kernel

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