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[Jürg Häfliger <1765673@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1777682 ***
    https://bugs.launchpad.net/bugs/1777682

** Tags added: kernel-daily-bug

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

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

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Triaged
Status in linux-hwe-edge package in Ubuntu:
  Triaged

Bug description:
  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)

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