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Bug #938

open

Enabling two events with same name but not the same event type cause no warning and does not behave as expected

Added by Jonathan Rajotte Julien over 9 years ago. Updated about 7 years ago.

Status:
Confirmed
Priority:
Normal
Assignee:
-
Target version:
LTTng - 2.10
Start date:
09/15/2015
Due date:
% Done:

0%

Estimated time:

Description

sudo lttng-sessiond -d
lttng create mysession
lttng enable-event --kernel kmem_kfree --probe sys_open+0xE
lttng enable-event --kernel kmem_kfree
lttng start
sleep 0.1
lttng stop
lttng view

Only the probe is considered when tracing. The metadata only shows the probe event.

This is a kernel tracer side problem (name as event key). A solution could be to prefix certain type of event on enable thus creating namespace e.g: probe_kmem_kfree.

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 #1

Updated by Jérémie Galarneau over 8 years ago

  • Project changed from LTTng to LTTng-modules
  • Target version changed from 2.8 to 2.9

Assigning to LTTng-modules as per the bug description. I have not checked if this is an lttng-modules or lttng-tools limitation (using only the name as the key vs. a tuple of type+name+...).

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 #2

Updated by Mathieu Desnoyers about 8 years ago

  • Target version changed from 2.9 to 2.10
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 #3

Updated by Francis Deslauriers about 7 years ago

I also faced that issue with the following commands with --function event type:

lttng enable-event -k --function=sys_open sched_switch
lttng enable-event -k --probe=sys_read sched_switch
lttng enable-event -k sched_switch

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