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Bug #660

closed

lttng snapshot record fails to increment the snapshot sequence number

Added by Daniel U. Thibault about 11 years ago. Updated almost 11 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
-
Target version:
LTTng - 2.3
Start date:
11/15/2013
Due date:
% Done:

0%

Estimated time:

Description

Using:
lttng-modules 2.3.0-1 78c8710
lttng-tools 2.3.0-1 c9dc128
lttng-ust 2.3.0-1 9f00ce3
userspace-rcu 0.8.0-1 ca617ca
on:
Ubuntu 12.04.3 LTS precise,
3.2.0-53-virtual kernel

$ sudo -H lttng create mySession --snapshot
Spawning a session daemon
Session mySession created.
Default snapshot output set to: /root/lttng-traces/mySession-20130925-101114
Snapshot mode set. Every channel enabled for that session will be set in overwrite mode and mmap output.
$ sudo -H lttng enable-event -a -k -syscall
All kernel system calls are enabled in channel channel0
$ sudo -H lttng start
Tracing started for session mySession
$ sudo -H lttng snapshot record
Snapshot recorded successfully for session mySession
$ sudo -H lttng snapshot record
Snapshot recorded successfully for session mySession

If the two snapshot record commands are issued within the same one-second window, I get just one snapshot in lttng-traces (e.g. mySession-20131115-102848/snapshot-1-20131115-103147-0). Presumably the second one overwrote the first. I am unable to get any snapshots with a ...-1 snapshot folder name.

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