This is probably being caused by the following commit:
commit 4fbb658dd8ce96384852ceae18b0b09034de7b36
Author: Marcelo Henrique Cerri <[email protected]>
Date: Mon Jun 11 18:22:54 2018 -0300
UBUNTU: [Config] azure: CONFIG_HOTPLUG_CPU=n
The lttng_hp_prepare and lttng_hp_online variables are declared inside a
#ifdef block and are probably used somewhere else without the proper
checking.
So this is a regression that needs to be fixed on the lttng dkms code.
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https://bugs.launchpad.net/bugs/1778642
Title:
ubuntu_lttng_smoke_test failed on Azure 4.15
Status in lttng-modules:
New
Status in ubuntu-kernel-tests:
New
Status in linux-azure package in Ubuntu:
New
Bug description:
***THIS IS A POTENTIAL REGRESSION***
This test will pass with the older kernel, 4.15.0-1013-azure, but not
the 4.15.0-1014-azure in -proposed.
It looks like the kernel module can be installed, but four tests have
failed:
== lttng smoke test of session create/destroy ==
Session test-kernel-session created.
Traces will be written in /tmp/lttng-kernel-trace-14716-session
PASSED (lttng create)
Session test-kernel-session destroyed
PASSED (lttng destroy)
== lttng smoke test list kernel events ==
FAILED (lttng list --kernel)
FAILED (lttng list --kernel more output expected)
== lttng smoke test trace open/close system calls ==
Session test-kernel-session created.
Traces will be written in /tmp/lttng-kernel-trace-14716-session
PASSED (lttng create)
FAILED (lttng enable-event)
Session test-kernel-session destroyed
== lttng smoke test trace context switches ==
Session test-kernel-session created.
Traces will be written in /tmp/lttng-kernel-trace-14716-session
PASSED (lttng create)
FAILED (lttng enable-event)
Session test-kernel-session destroyed
Summary: 4 passed, 4 failed
http://10.246.72.46/4.15.0-1014.14-azure/bionic-linux-azure-
azure-4.15.0-Standard_D12-ubuntu_lttng_smoke_test/ubuntu_lttng_smoke_test/results/ubuntu_lttng_smoke_test
.lttng-smoke-test/debug/ubuntu_lttng_smoke_test.lttng-smoke-
test.DEBUG.html
Error message from /var/log/syslog:
kernel: [ 639.531889] PKCS#7 signature not signed with a trusted key
kernel: [ 639.538251] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
kernel: [ 639.538280] lttng_tracer: Unknown symbol lttng_hp_online (err 0)
lttng-sessiond[1097]: Error: Unable to load required module
lttng-ring-buffer-client-discard
lttng-sessiond[1097]: Warning: No kernel tracer available
kernel: [ 639.606845] PKCS#7 signature not signed with a trusted key
kernel: [ 639.613331] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
kernel: [ 639.613360] lttng_tracer: Unknown symbol lttng_hp_online (err 0)
lttng-sessiond[1097]: Error: Unable to load required module
lttng-ring-buffer-client-discard
lttng-sessiond[1097]: Warning: No kernel tracer available
kernel: [ 639.677124] PKCS#7 signature not signed with a trusted key
kernel: [ 639.680857] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
kernel: [ 639.680886] lttng_tracer: Unknown symbol lttng_hp_online (err 0)
lttng-sessiond[1097]: Error: Unable to load required module
lttng-ring-buffer-client-discard
lttng-sessiond[1097]: Warning: No kernel tracer available
kernel: [ 639.737914] PKCS#7 signature not signed with a trusted key
kernel: [ 639.753366] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
kernel: [ 639.753394] lttng_tracer: Unknown symbol lttng_hp_online (err 0)
lttng-sessiond[1097]: Error: Unable to load required module
lttng-ring-buffer-client-discard
lttng-sessiond[1097]: Warning: No kernel tracer available
kernel: [ 639.829710] PKCS#7 signature not signed with a trusted key
kernel: [ 639.843736] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
kernel: [ 639.843765] lttng_tracer: Unknown symbol lttng_hp_online (err 0)
lttng-sessiond[1097]: Error: Unable to load required module
lttng-ring-buffer-client-discard
lttng-sessiond[1097]: Warning: No kernel tracer available
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