This bug was fixed in the package lttng-modules - 2.8.0-1ubuntu1~16.04.7
---------------
lttng-modules (2.8.0-1ubuntu1~16.04.7) xenial; urgency=medium
* ubuntu_lttng_smoke_test failed on Azure 4.15 (LP: #1778642)
-
debian/patches/0041-Fix-do-not-use-CONFIG_HOTPLUG_CPU-for-the-new-hotplu.patch
- debian/patches/0042-Cleanup-comment-about-CONFIG_HOTPLUG_CPU-ifdef.patch
-- Kleber Sacilotto de Souza <kleber.so...@canonical.com> Thu, 19 Jul
2018 17:47:16 +0200
** Changed in: lttng-modules (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1778642
Title:
ubuntu_lttng_smoke_test failed on Azure 4.15
Status in ubuntu-kernel-tests:
Invalid
Status in linux-azure package in Ubuntu:
Invalid
Status in lttng-modules package in Ubuntu:
Fix Released
Status in linux-azure source package in Xenial:
Invalid
Status in lttng-modules source package in Xenial:
Fix Released
Status in linux-azure source package in Bionic:
Invalid
Status in lttng-modules source package in Bionic:
In Progress
Status in linux-azure source package in Cosmic:
Invalid
Status in lttng-modules source package in Cosmic:
Fix Released
Bug description:
SRU Request:
[Impact]
After bionic/linux-azure commit
4fbb658dd8ce96384852ceae18b0b09034de7b36 (UBUNTU: [Config] azure:
CONFIG_HOTPLUG_CPU=n) the lttng_tracer module cannot find some symbols
and cannot be loaded.
kernel: [ 639.538251] lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
kernel: [ 639.538280] lttng_tracer: Unknown symbol lttng_hp_online (err 0)
This is caused by lttng-modules incorrectly handling the case when
CONFIG_HOTPLUG_CPU is not enabled.
[Test Case]
Install linux-azure >= 4.15.0-1014, install lttng-modules-dkms and run
the autotest ubuntu_lttng_smoke_test testcase (or just 'sudo lttng
list --kernel').
[Fix]
commit 894ce5dc825733d1ccab25b1aede9ce0be2a7c4e (Fix: do not use
CONFIG_HOTPLUG_CPU for the new hotplug API)
commit 1ee63d8d1b0aaf30564d3879d8e9282d0ddfef1b (Cleanup: comment
about CONFIG_HOTPLUG_CPU ifdef)
[Regression Potential]
Very low. The two patches can be cleanly cherry-picked from the
upstream commits. The first one that really fixed the issue just
changes a single #ifdef to compile a piece of code when
CONFIG_HOTPLUG_CPU is not defined. The second one just updates some
comments on the code to make them consistent with the changes.
[Original Description]
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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