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[Bug 2067702] Re: lttng-modules failed to build on J-azure-6.8

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Also seen on:
 	SRU Cycle:	2025.01.13
 	Series:	jammy
 	Package:	linux-realtime
 	Version:	5.15.0-1078.86
 	Cloud:	openstack
 	Instance:	amd64-vm
 	Region:	prodstack5
 	Operation:	sru

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https://bugs.launchpad.net/bugs/2067702

Title:
  lttng-modules failed to build on J-azure-6.8

Status in ubuntu-kernel-tests:
  New

Bug description:
  Issue found with J-azure-6.8.0-1008.8~22.04.1

  Module build failed with:
   Running 'cat /var/lib/dkms/lttng-modules/*/build/make.log'
   DKMS make.log for lttng-modules-2.13.8 for kernel 6.8.0-1008-azure (x86_64)
   Thu May 30 14:53:24 UTC 2024
   make: Entering directory '/usr/src/linux-headers-6.8.0-1008-azure'
   warning: the compiler differs from the one used to build the kernel
     The kernel was built by: x86_64-linux-gnu-gcc-11 (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
     You are using:           gcc-11 (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
   /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/Kbuild:27: File ./mm/slab.h not found. Probe "kmem" is disabled. Use full kernel source tree to enable it.
   /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/Kbuild:80: File ./arch/x86/kvm/lapic.h not found. Probe "kvm" x86-specific is disabled. Use full kernel source tree to enable it.
   /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/Kbuild:187: Files ./fs/btrfs/*.h not found. Probe "btrfs" is disabled. Use full kernel source tree to enable it.
   /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/Kbuild:206: Files ./mm/internal.h not found. Probe "compaction" is disabled. Use full kernel source tree to enable it.
   /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/Kbuild:215: Files ./fs/ext4/*.h not found. Probe "ext4" is disabled. Use full kernel source tree to enable it.
   /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/Kbuild:244: File ./drivers/base/regmap/trace.h not found. Probe "regmap" is disabled. Need Linux 4.1+ kernel source tree to enable it.
     CC [M]  /var/lib/dkms/lttng-modules/2.13.8/build/src/lib/ringbuffer/ring_buffer_backend.o
     CC [M]  /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/lttng-probe-sched.o
   /var/lib/dkms/lttng-modules/2.13.8/build/src/lib/ringbuffer/ring_buffer_backend.c: In function ‘channel_backend_init’:
   /var/lib/dkms/lttng-modules/2.13.8/build/src/lib/ringbuffer/ring_buffer_backend.c:408:9: error: implicit declaration of function ‘strlcpy’; did you mean ‘strscpy’? [-Werror=implicit-function-declaration]
     408 |         strlcpy(chanb->name, name, NAME_MAX);
         |         ^~~~~~~
         |         strscpy
   In file included from /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/../../include/lttng/define_trace.h:87,
                    from /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/../../include/instrumentation/events/sched.h:709,
                    from /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/lttng-probe-sched.c:28:
   /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/../../include/lttng/tracepoint-event-impl.h:133:6: error: conflicting types for ‘trace_sched_stat_runtime’; have ‘void(struct task_struct *, u64,  u64)’ {aka ‘void(struct task_struct *, long long unsigned int,  long long unsigned int)’}
     133 | void trace_##_name(_proto);
         |      ^~~~~~
   /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/../../include/lttng/tracepoint-event-impl.h:45:9: note: in expansion of macro ‘LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP’
      45 |         LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(map, name, map, PARAMS(proto), PARAMS(args))
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/../../include/lttng/tracepoint-event-impl.h:87:9: note: in expansion of macro ‘LTTNG_TRACEPOINT_EVENT_MAP’
      87 |         LTTNG_TRACEPOINT_EVENT_MAP(name, name,                          \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
   /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/../../include/instrumentation/events/sched.h:651:1: note: in expansion of macro ‘LTTNG_TRACEPOINT_EVENT’
     651 | LTTNG_TRACEPOINT_EVENT(sched_stat_runtime,
         | ^~~~~~~~~~~~~~~~~~~~~~
   In file included from ./include/trace/events/sched.h:10,
                    from /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/lttng-probe-sched.c:17:
   ./include/linux/tracepoint.h:255:28: note: previous definition of ‘trace_sched_stat_runtime’ with type ‘void(struct task_struct *, u64)’ {aka ‘void(struct task_struct *, long long unsigned int)’}
     255 |         static inline void trace_##name(proto)                          \
         |                            ^~~~~~
   ./include/linux/tracepoint.h:432:9: note: in expansion of macro ‘__DECLARE_TRACE’
     432 |         __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),              \
         |         ^~~~~~~~~~~~~~~
   ./include/linux/tracepoint.h:555:9: note: in expansion of macro ‘DECLARE_TRACE’
     555 |         DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
         |         ^~~~~~~~~~~~~
   ./include/trace/events/sched.h:517:1: note: in expansion of macro ‘DEFINE_EVENT’
     517 | DEFINE_EVENT(sched_stat_runtime, sched_stat_runtime,
         | ^~~~~~~~~~~~
   make[4]: *** [scripts/Makefile.build:243: /var/lib/dkms/lttng-modules/2.13.8/build/src/probes/lttng-probe-sched.o] Error 1
   make[3]: *** [scripts/Makefile.build:481: /var/lib/dkms/lttng-modules/2.13.8/build/src/probes] Error 2
   make[3]: *** Waiting for unfinished jobs....
     CC [M]  /var/lib/dkms/lttng-modules/2.13.8/build/src/lib/ringbuffer/ring_buffer_frontend.o
   cc1: some warnings being treated as errors
   make[4]: *** [scripts/Makefile.build:243: /var/lib/dkms/lttng-modules/2.13.8/build/src/lib/ringbuffer/ring_buffer_backend.o] Error 1
   make[4]: *** Waiting for unfinished jobs....
   /var/lib/dkms/lttng-modules/2.13.8/build/src/lib/ringbuffer/ring_buffer_frontend.c:2409:12: warning: no previous prototype for ‘init_lib_ring_buffer_frontend’ [-Wmissing-prototypes]
    2409 | int __init init_lib_ring_buffer_frontend(void)
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   /var/lib/dkms/lttng-modules/2.13.8/build/src/lib/ringbuffer/ring_buffer_frontend.c:2420:13: warning: no previous prototype for ‘exit_lib_ring_buffer_frontend’ [-Wmissing-prototypes]
    2420 | void __exit exit_lib_ring_buffer_frontend(void)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   make[3]: *** [scripts/Makefile.build:481: /var/lib/dkms/lttng-modules/2.13.8/build/src/lib] Error 2
   make[2]: *** [scripts/Makefile.build:481: /var/lib/dkms/lttng-modules/2.13.8/build/src] Error 2
   make[1]: *** [/usr/src/linux-headers-6.8.0-1008-azure/Makefile:1926: /var/lib/dkms/lttng-modules/2.13.8/build] Error 2
   make: *** [Makefile:240: __sub-make] Error 2
   make: Leaving directory '/usr/src/linux-headers-6.8.0-1008-azure'

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