This bug seems to be resolved by the following commits from lttng-
modules upstream:
===============================================
commit 1ee63d8d1b0aaf30564d3879d8e9282d0ddfef1b
Author: Michael Jeanson <mjean...@efficios.com>
Date: Tue Mar 13 12:14:43 2018 -0400
Cleanup: comment about CONFIG_HOTPLUG_CPU ifdef
Signed-off-by: Michael Jeanson <mjean...@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
commit 894ce5dc825733d1ccab25b1aede9ce0be2a7c4e
Author: Lars Persson <lars.pers...@axis.com>
Date: Sun Mar 11 15:02:43 2018 +0100
Fix: do not use CONFIG_HOTPLUG_CPU for the new hotplug API
Kernel configurations without CONFIG_HOTPLUG_CPU throw an unknown
symbol error when attempting to insert the lttng-trace module:
lttng_tracer: Unknown symbol lttng_hp_prepare (err 0)
lttng_tracer: Unknown symbol lttng_hp_online (err 0)
This was caused by lttng-events and lttng-context-perf-counter not
agreeing on which preprocessor condition that should guard the use of
the hotplug API. In fact the API is available also on kernels built
without CONFIG_HOTPLUG_CPU.
Signed-off-by: Lars Persson <lar...@axis.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
===============================================
I will build a test package and attach here a debdiff.
** Changed in: linux-azure (Ubuntu)
Status: New => Invalid
** Changed in: ubuntu-kernel-tests
Status: New => Invalid
** Also affects: lttng-modules (Ubuntu)
Importance: Undecided
Status: New
** Also affects: lttng-modules (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux-azure (Ubuntu Bionic)
Status: New => Invalid
** Changed in: lttng-modules (Ubuntu Bionic)
Status: New => In Progress
** Changed in: lttng-modules (Ubuntu)
Status: New => Fix Released
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Packages, which is subscribed to linux-azure in Ubuntu.
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:
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 Bionic:
Invalid
Status in lttng-modules source package in Bionic:
In Progress
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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