** Description changed:
+ [Impact]
+
+ lttng-modules FTBFS in Resolute on kernel 7.0.0-28.28:
+
+ probes/Kbuild:214: File
/usr/src/linux-headers-7.0.0-28-generic/drivers/base/regmap/trace.h not found.
Probe "regmap" is disabled. Use full kernel source tree
+ to enable it.
+ CC [M] probes/lttng-probe-sched.o
+ CC [M] probes/lttng-probe-irq.o
+ CC [M] probes/lttng-probe-timer.o
+ In file included from probes/../../include/lttng/define_trace.h:87,
+ from probes/../../include/instrumentation/events/timer.h:437,
+ from probes/lttng-probe-timer.c:30:
+ probes/../../include/lttng/tracepoint-event-impl.h:133:6: error: conflicting
types for ‘trace_hrtimer_start’; have ‘void(struct hrtimer *, enum
hrtimer_mode)’
+ 133 | void trace_##_name(_proto);
+ | ^~~~~~
+ 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))
+ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ probes/../../include/instrumentation/events/timer.h:229:1: note: in expansion
of macro ‘LTTNG_TRACEPOINT_EVENT_MAP’
+ 229 | LTTNG_TRACEPOINT_EVENT_MAP(hrtimer_start,
+ | ^~~~~~~~~~~~~~~~~~~~~~~~~~
+ In file included from
/usr/src/linux-headers-7.0.0-28-generic/include/trace/events/timer.h:8,
+ from probes/lttng-probe-timer.c:19:
+ /usr/src/linux-headers-7.0.0-28-generic/include/linux/tracepoint.h:309:28:
note: previous definition of ‘trace_hrtimer_start’ with type ‘void(struct
hrtimer *, enum hrtimer_mode, bool)’ {aka ‘void(struct hrtimer *, enum
hrtimer_mode, _Bool)’}
+ 309 | static inline void trace_##name(proto)
\
+ | ^~~~~~
+ /usr/src/linux-headers-7.0.0-28-generic/include/linux/tracepoint.h:515:9:
note: in expansion of macro ‘__DECLARE_TRACE’
+ 515 | __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),
\
+ | ^~~~~~~~~~~~~~~
+ /usr/src/linux-headers-7.0.0-28-generic/include/linux/tracepoint.h:653:9:
note: in expansion of macro ‘DECLARE_TRACE_EVENT’
+ 653 | DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args))
+ | ^~~~~~~~~~~~~~~~~~~
+ /usr/src/linux-headers-7.0.0-28-generic/include/trace/events/timer.h:223:1:
note: in expansion of macro ‘TRACE_EVENT’
+ 223 | TRACE_EVENT(hrtimer_start,
+ | ^~~~~~~~~~~
+ make[5]: ***
[/usr/src/linux-headers-7.0.0-28-generic/scripts/Makefile.build:289:
probes/lttng-probe-timer.o] Error 1
+ make[4]: ***
[/usr/src/linux-headers-7.0.0-28-generic/scripts/Makefile.build:548: probes]
Error 2
+ make[3]: *** [/usr/src/linux-headers-7.0.0-28-generic/Makefile:2115: .] Error
2
+ make[2]: *** [/usr/src/linux-headers-7.0.0-28-generic/Makefile:248:
__sub-make] Error 2
+ make[2]: Leaving directory '/var/lib/dkms/lttng-modules/2.15.0/build/src'
+ make[1]: *** [Makefile:248: __sub-make] Error 2
+ make[1]: Leaving directory '/usr/src/linux-headers-7.0.0-28-generic'
+ make: *** [Makefile:44: modules] Error 2
+
+ This is a regression happening because of an update coming from upstream
+ to Resolute kernel.
+
+ [Fix]
+
+ Appply the following patches from upstream to lttng-modules:
+ - 0f80fc3f ("fix: hrtimer: Reduce trace noise in hrtimer_start() (v7.1)")
+ - 5d6b115f ("fix: backport: hrtimer: Reduce trace noise in hrtimer_start()
(v6.1.175)")
+
+ [Test Plan]
+
+ Build and load lttng-modules-dkms on Resolute.
+ $ sudo apt install lttng-modules-dkms
+ $ sudo dkms status
+ $ sudo modprobe lttng-test
+
+ [Regression Potential]
+
+ We may experience regressions in systems that are using the lttng
+ debugging tools in Resolute.
+
+ ---
This is a potential regression:
- * Test did not fail with previous kernel 7.0.0-27.27 in s2026.05.18 and
7.0.0-26.26 in 2026.05.18
- * They are using the same version of DKMS lttng-modules-dkms
(2.15.0-1ubuntu1) between these cycles
+ * Test did not fail with previous kernel 7.0.0-27.27 in s2026.05.18 and
7.0.0-26.26 in 2026.05.18
+ * They are using the same version of DKMS lttng-modules-dkms
(2.15.0-1ubuntu1) between these cycles
With 7.0.0-27.27, this test can be found failing on Openstack AMD64
1687 ID: com.canonical.kernel::ubuntu_lttng_smoke_test/lttng-smoke-test
1688 Category: com.canonical.plainbox::uncategorised
1689 ... 8<
-------------------------------------------------------------------------
1690 22:31:07 Running 'timeout 1800s ubuntu_lttng_smoke_test.sh'
1691 == lttng smoke test of session create/destroy ==
1692 Session test-kernel-session created.
1693 Traces will be output to /tmp/lttng-kernel-trace-12477-session
1694 PASSED (lttng create)
1695 Session `test-kernel-session` destroyed
1696 PASSED (lttng destroy)
- 1697
+ 1697
1698 == lttng smoke test trace context switches ==
1699 Session test-kernel-session created.
1700 Traces will be output to /tmp/lttng-kernel-trace-12477-session
1701 PASSED (lttng create)
1702 FAILED (lttng enable-event)
1703 Session `test-kernel-session` destroyed
- 1704
+ 1704
1705 Summary: 3 passed, 2 failed
1706
------------------------------------------------------------------------- >8 ---
1707 Outcome: job failed
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https://bugs.launchpad.net/bugs/2158238
Title:
[Potential regression] ubuntu_lttng_smoke_test failed with R/linux
7.0.0-28.28
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