LTTNG−CRASH - Online Linux Manual PageSection : 1
Updated : 2 April 2020
Source : LTTng 2​.12​.2
Note : LTTng Manual

NAMElttng-crash − Recover and view LTTng 2 trace buffers in the event of a crash

SYNOPSISlttng−crash [--extract=PATH | --viewer=VIEWER] [-v | -vv | -vvv] SHMDIR

DESCRIPTIONThe 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 is used to recover and view 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 option Extracts them as uncorrupted LTTng traces on the file system​. SHMDIR is the directory specified as the argument of the --shm-path option of the lttng-create(1) command used to create the tracing session for which to recover the traces​.

OPTIONS-x PATH, --extract=PATH Extract recovered traces to path PATH; do not execute the trace viewer​. -v, --verbose Increase verbosity​. Three levels of verbosity are available, which are triggered by appending additional v letters to the option (that is, -vv and -vvv)​. -e VIEWER, --viewer=VIEWER Use trace viewer VIEWER to view the trace buffers​. VIEWER is the absolute path to the viewer command to use, and it can contain command arguments as well​. The trace directory paths are passed to the VIEWER command as its last arguments​. Without this option, lttng crash uses babeltrace2(1) if its available​. Otherwise, it tries to use babeltrace(1)​.

Program information-h, --help Show help​. -V, --version Show version​.

EXIT STATUS0 Success 1 Error 3 Fatal error

BUGSIf you encounter any issue or usability problem, please report it on the LTTng bug tracker <https://bugs.lttng.org/projects/lttng-tools>​.

RESOURCES•  LTTng project website <https://lttng.org> •  LTTng documentation <https://lttng.org/docs> •  Git repositories <http://git.lttng.org> •  GitHub organization <http://github.com/lttng> •  Continuous integration <http://ci.lttng.org/> •  Mailing list <http://lists.lttng.org> for support and development: lttng-dev@lists.lttng.org •  IRC channel <irc://irc.oftc.net/lttng>: #lttng on irc.oftc.net

COPYRIGHTSThis 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​.

THANKSSpecial 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 ALSOlttng(1), lttng-sessiond(8), lttng-relayd(8), lttng-ust(3), babeltrace2(1)
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