lttng-crash - Man Page
Recover and read LTTng trace buffers in the event of a crash
Synopsis
lttng-crash [--extract=DIR | --viewer=READER] [-verbose]... SHMDIR
Description
The Linux Trace Toolkit: next generation <https://lttng.org/> is an open-source software package used for correlated tracing of the Linux kernel, user applications, and user libraries.
LTTng consists of Linux kernel modules (for Linux kernel tracing) and dynamically loaded libraries (for user application and library tracing).
The lttng-crash command-line tool recovers LTTng trace buffers in the event of a system crash.
lttng-crash reads files within the directory SHMDIR and does one of:
Without the --extract option
Launches a trace reader (see the --viewer option) to view the recovered traces.
With the --extract=DIR option
Extracts the files as uncorrupted LTTng traces to the DIR directory.
SHMDIR is the directory specified as the argument of the --shm-path option of the lttng-create(1) command used to create the recording session for which to recover the traces.
Options
- -x DIR, --extract=DIR
Extract recovered traces to the directory DIR; do NOT execute any trace reader.
- -v, --verbose
Increase verbosity.
Specify this option up to three times to get more levels of verbosity.
- -e READER, --viewer=READER
Use the trace reader READER to read the trace buffers.
READER is the absolute path to the reader command to use, and it can contain command arguments as well. lttng-crash passes the trace directory paths to the READER command as its last arguments.
Without this option, lttng crash uses babeltrace2(1) if it’s available. Otherwise, it tries to use babeltrace(1).
Program information
- -h, --help
Show help.
This option attempts to launch /usr/bin/man to view this manual page. Override the manual pager path with the LTTNG_MAN_BIN_PATH environment variable.
- --list-options
List available command options and quit.
- -V, --version
Show version and quit.
Exit Status
- 0
Success
- 1
Error
- 3
Fatal error
Resources
- LTTng project website <https://lttng.org>
- LTTng documentation <https://lttng.org/docs>
- LTTng bug tracker <https://bugs.lttng.org>
- Git repositories <https://git.lttng.org>
- GitHub organization <https://github.com/lttng>
- Continuous integration <https://ci.lttng.org/>
- Mailing list <https://lists.lttng.org/> for support and development: lttng-dev@lists.lttng.org
- IRC channel <irc://irc.oftc.net/lttng>: #lttng on irc.oftc.net
- Mastodon <https://mastodon.social/@lttng>
Copyright
This program is part of the LTTng-tools project.
LTTng-tools is distributed under the GNU General Public License version 2 <http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html>. See the LICENSE <https://github.com/lttng/lttng-tools/blob/master/LICENSE> file for details.
Thanks
Special thanks to Michel Dagenais and the DORSAL laboratory <http://www.dorsal.polymtl.ca/> at École Polytechnique de Montréal for the LTTng journey.
Also thanks to the Ericsson teams working on tracing which helped us greatly with detailed bug reports and unusual test cases.
See Also
Referenced By
babeltrace2-source.ctf.fs(7), lttng-create(1).