** Description changed:

  [ Impact ]
  
  DKMS make.log for lttng-modules-2.13.11 for kernel 6.17.0-7-generic (x86_64)
  Thu Dec  4 18:20:31 UTC 2025
  make: Entering directory '/usr/src/linux-headers-6.17.0-7-generic'
  make[1]: Entering directory '/var/lib/dkms/lttng-modules/2.13.11/build'
  warning: the compiler differs from the one used to build the kernel
    The kernel was built by: x86_64-linux-gnu-gcc-13 (Ubuntu 
13.3.0-6ubuntu2~24.04) 13.3.0
    You are using:           gcc-13 (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
    CC [M]  src/lttng-ring-buffer-client-discard.o
  src/probes/Kbuild:27: File /usr/src/linux-headers-6.17.0-7-generic/mm/slab.h 
not found. Probe "kmem" is disabled. Use full kernel source tree to enable it.
  src/probes/Kbuild:81: File 
/usr/src/linux-headers-6.17.0-7-generic/arch/x86/kvm/lapic.h not found. Probe 
"kvm" x86-specific is disabled. Use full kernel source tree to enable it.
    CC [M]  src/tests/probes/lttng-test.o
    CC [M]  src/lib/ringbuffer/ring_buffer_backend.o
  src/probes/Kbuild:188: Files 
/usr/src/linux-headers-6.17.0-7-generic/fs/btrfs/*.h not found. Probe "btrfs" 
is disabled. Use full kernel source tree to enable it.
  src/probes/Kbuild:207: Files 
/usr/src/linux-headers-6.17.0-7-generic/mm/internal.h not found. Probe 
"compaction" is disabled. Use full kernel source tree to enable it.
  src/probes/Kbuild:216: Files 
/usr/src/linux-headers-6.17.0-7-generic/fs/ext4/*.h not found. Probe "ext4" is 
disabled. Use full kernel source tree to enable it.
  src/probes/Kbuild:245: File 
/usr/src/linux-headers-6.17.0-7-generic/drivers/base/regmap/trace.h not found. 
Probe "regmap" is disabled. Need Linux 4.1+ kernel source tree to enable it.
    CC [M]  src/probes/lttng-probe-sched.o
  In file included from <command-line>:
  
/usr/src/linux-headers-6.17.0-7-generic/include/linux/static_call_types.h:15:41:
 error: ‘__SCT__tp_func_lttng_test_filter_event’ undeclared here (not in a 
function); did you mean ‘__SCK__tp_func_lttng_test_filter_event’?
     15 | #define STATIC_CALL_TRAMP_PREFIX        __SCT__
        |                                         ^~~~~~~
  /usr/src/linux-headers-6.17.0-7-generic/include/linux/compiler_types.h:83:23: 
note: in definition of macro ‘___PASTE’
     83 | #define ___PASTE(a,b) a##b
        |                       ^
  
/usr/src/linux-headers-6.17.0-7-generic/include/linux/static_call_types.h:18:41:
 note: in expansion of macro ‘__PASTE’
     18 | #define STATIC_CALL_TRAMP(name)         
__PASTE(STATIC_CALL_TRAMP_PREFIX, name)
        |                                         ^~~~~~~
  
/usr/src/linux-headers-6.17.0-7-generic/include/linux/static_call_types.h:18:49:
 note: in expansion of macro ‘STATIC_CALL_TRAMP_PREFIX’
     18 | #define STATIC_CALL_TRAMP(name)         
__PASTE(STATIC_CALL_TRAMP_PREFIX, name)
        |                                                 
^~~~~~~~~~~~~~~~~~~~~~~~
  /usr/src/linux-headers-6.17.0-7-generic/include/linux/static_call.h:146:39: 
note: in expansion of macro ‘STATIC_CALL_TRAMP’
    146 | #define STATIC_CALL_TRAMP_ADDR(name) &STATIC_CALL_TRAMP(name)
        |                                       ^~~~~~~~~~~~~~~~~
  /usr/src/linux-headers-6.17.0-7-generic/include/linux/tracepoint.h:325:38: 
note: in expansion of macro ‘STATIC_CALL_TRAMP_ADDR’
    325 |                 .static_call_tramp = 
STATIC_CALL_TRAMP_ADDR(tp_func_##_name), \
        |                                      ^~~~~~~~~~~~~~~~~~~~~~
  /usr/src/linux-headers-6.17.0-7-generic/include/linux/tracepoint.h:371:9: 
note: in expansion of macro ‘__DEFINE_TRACE_EXT’
    371 |         __DEFINE_TRACE_EXT(_name, NULL, PARAMS(_proto), 
PARAMS(_args));
        |         ^~~~~~~~~~~~~~~~~~
  src/tests/../../include/wrapper/tracepoint.h:19:9: note: in expansion of 
macro ‘DEFINE_TRACE’
     19 |         DEFINE_TRACE(name, PARAMS(proto), PARAMS(args))
        |         ^~~~~~~~~~~~
  src/tests/probes/lttng-test.c:28:1: note: in expansion of macro 
‘LTTNG_DEFINE_TRACE’
     28 | LTTNG_DEFINE_TRACE(lttng_test_filter_event,
        | ^~~~~~~~~~~~~~~~~~
  In file included from src/probes/../../include/lttng/define_trace.h:87,
                   from 
src/probes/../../include/instrumentation/events/sched.h:730,
                   from src/probes/lttng-probe-sched.c:28:
  src/probes/../../include/lttng/tracepoint-event-impl.h:133:6: error: 
conflicting types for ‘trace_sched_process_exit’; have ‘void(struct task_struct 
*)’
    133 | void trace_##_name(_proto);
        |      ^~~~~~
  src/probes/../../include/lttng/tracepoint-event-impl.h:98:9: note: in 
expansion of macro ‘LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP’
     98 |         LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(template, name, name, 
PARAMS(proto), PARAMS(args))
        |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  src/probes/../../include/instrumentation/events/sched.h:474:1: note: in 
expansion of macro ‘LTTNG_TRACEPOINT_EVENT_INSTANCE’
    474 | LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_process_template, 
sched_process_exit,
        | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  In file included from 
/usr/src/linux-headers-6.17.0-7-generic/include/trace/events/sched.h:10,
                   from src/probes/lttng-probe-sched.c:17:
  /usr/src/linux-headers-6.17.0-7-generic/include/linux/tracepoint.h:278:28: 
note: previous definition of ‘trace_sched_process_exit’ with type ‘void(struct 
task_struct *, bool)’ {aka ‘void(struct task_struct *, _Bool)’}
    278 |         static inline void trace_##name(proto)                        
  \
        |                            ^~~~~~
  /usr/src/linux-headers-6.17.0-7-generic/include/linux/tracepoint.h:481:9: 
note: in expansion of macro ‘__DECLARE_TRACE’
    481 |         __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),            
  \
        |         ^~~~~~~~~~~~~~~
  /usr/src/linux-headers-6.17.0-7-generic/include/linux/tracepoint.h:619:9: 
note: in expansion of macro ‘DECLARE_TRACE_EVENT’
    619 |         DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
        |         ^~~~~~~~~~~~~~~~~~~
  /usr/src/linux-headers-6.17.0-7-generic/include/trace/events/sched.h:335:1: 
note: in expansion of macro ‘TRACE_EVENT’
    335 | TRACE_EVENT(sched_process_exit,
        | ^~~~~~~~~~~
  make[5]: *** 
[/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:287: 
src/tests/probes/lttng-test.o] Error 1
  make[4]: *** 
[/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:556: src/tests] 
Error 2
  make[4]: *** Waiting for unfinished jobs....
    CC [M]  src/probes/lttng-probe-irq.o
  make[5]: *** 
[/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:287: 
src/probes/lttng-probe-sched.o] Error 1
  make[5]: *** Waiting for unfinished jobs....
    CC [M]  src/lib/ringbuffer/ring_buffer_frontend.o
    CC [M]  src/lib/ringbuffer/ring_buffer_iterator.o
    CC [M]  src/lib/ringbuffer/ring_buffer_vfs.o
  In file included from src/lib/ringbuffer/ring_buffer_frontend.c:54:
  src/lib/ringbuffer/ring_buffer_frontend.c: In function ‘switch_buffer_timer’:
  src/lib/../../include/wrapper/timer.h:38:9: error: implicit declaration of 
function ‘from_timer’; did you mean ‘mod_timer’? 
[-Werror=implicit-function-declaration]
     38 |         from_timer(var, callback_timer, timer_fieldname)
        |         ^~~~~~~~~~
  src/lib/ringbuffer/ring_buffer_frontend.c:337:48: note: in expansion of macro 
‘lttng_from_timer’
    337 |         struct lttng_kernel_ring_buffer *buf = lttng_from_timer(buf, 
t, switch_timer);
        |                                                ^~~~~~~~~~~~~~~~
  src/lib/ringbuffer/ring_buffer_frontend.c:337:73: error: ‘switch_timer’ 
undeclared (first use in this function); did you mean ‘switch_mode’?
    337 |         struct lttng_kernel_ring_buffer *buf = lttng_from_timer(buf, 
t, switch_timer);
        |                                                                       
  ^~~~~~~~~~~~
  src/lib/../../include/wrapper/timer.h:38:41: note: in definition of macro 
‘lttng_from_timer’
     38 |         from_timer(var, callback_timer, timer_fieldname)
        |                                         ^~~~~~~~~~~~~~~
  src/lib/ringbuffer/ring_buffer_frontend.c:337:73: note: each undeclared 
identifier is reported only once for each function it appears in
    337 |         struct lttng_kernel_ring_buffer *buf = lttng_from_timer(buf, 
t, switch_timer);
        |                                                                       
  ^~~~~~~~~~~~
  src/lib/../../include/wrapper/timer.h:38:41: note: in definition of macro 
‘lttng_from_timer’
     38 |         from_timer(var, callback_timer, timer_fieldname)
        |                                         ^~~~~~~~~~~~~~~
  src/lib/ringbuffer/ring_buffer_frontend.c: In function 
‘lib_ring_buffer_stop_switch_timer’:
  src/lib/ringbuffer/ring_buffer_frontend.c:391:9: error: implicit declaration 
of function ‘del_timer_sync’ [-Werror=implicit-function-declaration]
    391 |         del_timer_sync(&buf->switch_timer);
        |         ^~~~~~~~~~~~~~
  src/lib/ringbuffer/ring_buffer_frontend.c: In function ‘read_buffer_timer’:
  src/lib/ringbuffer/ring_buffer_frontend.c:400:73: error: ‘read_timer’ 
undeclared (first use in this function); did you mean ‘vread_iter’?
    400 |         struct lttng_kernel_ring_buffer *buf = lttng_from_timer(buf, 
t, read_timer);
        |                                                                       
  ^~~~~~~~~~
  src/lib/../../include/wrapper/timer.h:38:41: note: in definition of macro 
‘lttng_from_timer’
     38 |         from_timer(var, callback_timer, timer_fieldname)
        |                                         ^~~~~~~~~~~~~~~
  make[4]: *** 
[/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:556: 
src/probes] Error 2
    CC [M]  src/lib/ringbuffer/ring_buffer_splice.o
  src/lib/ringbuffer/ring_buffer_frontend.c: At top level:
  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)
        |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  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)
        |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  cc1: some warnings being treated as errors
  make[5]: *** 
[/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:287: 
src/lib/ringbuffer/ring_buffer_frontend.o] Error 1
  make[5]: *** Waiting for unfinished jobs....
  make[4]: *** 
[/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:556: src/lib] 
Error 2
  make[3]: *** 
[/usr/src/linux-headers-6.17.0-7-generic/scripts/Makefile.build:556: src] Error 
2
  make[2]: *** [/usr/src/linux-headers-6.17.0-7-generic/Makefile:2016: .] Error 
2
  make[1]: *** [/usr/src/linux-headers-6.17.0-7-generic/Makefile:248: 
__sub-make] Error 2
  make[1]: Leaving directory '/var/lib/dkms/lttng-modules/2.13.11/build'
  make: *** [Makefile:248: __sub-make] Error 2
  make: Leaving directory '/usr/src/linux-headers-6.17.0-7-generic'
  
  [ Test case ]
  
  Install the latest linux-6.17 kernel on Noble:
  
  $ sudo add-apt-repository ppa:canonical-kernel-team/ppa3
  $ sudo apt install linux-generic-hwe-24.04-edge
  
  Install lttng-modules-dkms:
  
  $ sudo apt install lttng-modules-dkms
  
  Module built and installed successfully.
  
  Load the module:
  
  $ sudo modprobe lttng-test
  
  Module loaded successfully.
  
  The same procedure can be repeated on linux-6.8 to test for possible
  regressions.
  
  Install the latest kernel on Questing and Resolute:
  
  Install lttng-modules-dkms:
  
  $ sudo apt install lttng-modules-dkms
  
  Module built and installed successfully.
  
  Load the module:
  
  $ sudo modprobe lttng-test
  
  Module loaded successfully.
  
+ The same test must be repeated on Noble linux-6.8 and linux-6.14 kernels.
+ The same test can be repeated for Questing.
+ 
  [ Fix ]
  
  Backport upstream patches from lttng-modules
  (https://git.lttng.org/?p=lttng-modules.git):
  
  [ Regression potential ]
  
  We may experience regressions in systems that are using the lttng-
  modules drivers, especially with kernels >= 6.8 kernel.

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https://bugs.launchpad.net/bugs/2133894

Title:
  lttng-modules-dkms FTBS in Noble with the linux-6.17 kernel

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