lttng-crash — Recover and view LTTng 2 trace buffers in the event of a crash
The Linux Trace Toolkit: next generation 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).
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
Launches a trace reader (see the
--viewer option) to view the
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.
Extract recovered traces to path PATH; do not execute the trace viewer.
Three levels of verbosity are available, which are triggered by
v letters to the option
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.
If you encounter any issue or usability problem, please report it on the LTTng bug tracker.
Special thanks to Michel Dagenais and the DORSAL laboratory 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.