| | 1 | lttng-crash(1) |
| | 2 | ============== |
| | 3 | :revdate: 2 April 2020 |
| | 4 | |
| | 5 | |
| | 6 | NAME |
| | 7 | ---- |
| | 8 | lttng-crash - Recover and view LTTng 2 trace buffers in the event of a crash |
| | 9 | |
| | 10 | |
| | 11 | SYNOPSIS |
| | 12 | -------- |
| | 13 | [verse] |
| | 14 | *lttng-crash* [option:--extract='PATH' | option:--viewer='VIEWER'] [option:-v | option:-vv | option:-vvv] 'SHMDIR' |
| | 15 | |
| | 16 | |
| | 17 | DESCRIPTION |
| | 18 | ----------- |
| | 19 | The https://lttng.org/[_Linux Trace Toolkit: next generation_] is an open |
| | 20 | source software package used for correlated tracing of the Linux kernel, |
| | 21 | user applications, and user libraries. |
| | 22 | |
| | 23 | LTTng consists of Linux kernel modules (for Linux kernel tracing) and |
| | 24 | dynamically loaded libraries (for user application and library tracing). |
| | 25 | |
| | 26 | The `lttng-crash` command-line tool is used to recover and view |
| | 27 | LTTng trace buffers in the event of a system crash. |
| | 28 | |
| | 29 | `lttng-crash` reads files within the directory 'SHMDIR' and does one |
| | 30 | of: |
| | 31 | |
| | 32 | Without the option:--extract option:: |
| | 33 | Launches a trace reader (see the option:--viewer option) to view the |
| | 34 | recovered traces. |
| | 35 | |
| | 36 | With the option:--extract option:: |
| | 37 | Extracts them as uncorrupted LTTng traces on the file system. |
| | 38 | |
| | 39 | 'SHMDIR' is the directory specified as the argument of the |
| | 40 | nloption:--shm-path option of the man:lttng-create(1) command used to |
| | 41 | create the tracing session for which to recover the traces. |
| | 42 | |
| | 43 | |
| | 44 | OPTIONS |
| | 45 | ------- |
| | 46 | option:-x 'PATH', option:--extract='PATH':: |
| | 47 | Extract recovered traces to path 'PATH'; do not execute the trace |
| | 48 | viewer. |
| | 49 | |
| | 50 | option:-v, option:--verbose:: |
| | 51 | Increase verbosity. |
| | 52 | + |
| | 53 | Three levels of verbosity are available, which are triggered by |
| | 54 | appending additional `v` letters to the option |
| | 55 | (that is, `-vv` and `-vvv`). |
| | 56 | |
| | 57 | option:-e 'VIEWER', option:--viewer='VIEWER':: |
| | 58 | Use trace viewer 'VIEWER' to view the trace buffers. 'VIEWER' is the |
| | 59 | absolute path to the viewer command to use, and it can contain |
| | 60 | command arguments as well. The trace directory paths are passed to |
| | 61 | the 'VIEWER' command as its last arguments. |
| | 62 | + |
| | 63 | Without this option, `lttng crash` uses man:babeltrace2(1) if it's |
| | 64 | available. Otherwise, it tries to use man:babeltrace(1). |
| | 65 | |
| | 66 | |
| | 67 | Program information |
| | 68 | ~~~~~~~~~~~~~~~~~~~ |
| | 69 | option:-h, option:--help:: |
| | 70 | Show help. |
| | 71 | |
| | 72 | option:-V, option:--version:: |
| | 73 | Show version. |
| | 74 | |
| | 75 | |
| | 76 | EXIT STATUS |
| | 77 | ----------- |
| | 78 | *0*:: |
| | 79 | Success |
| | 80 | |
| | 81 | *1*:: |
| | 82 | Error |
| | 83 | |
| | 84 | *3*:: |
| | 85 | Fatal error |
| | 86 | |
| | 87 | |
| | 88 | include::common-footer.txt[] |
| | 89 | |
| | 90 | |
| | 91 | SEE ALSO |
| | 92 | -------- |
| | 93 | man:lttng(1), |
| | 94 | man:lttng-sessiond(8), |
| | 95 | man:lttng-relayd(8), |
| | 96 | man:lttng-ust(3), |
| | 97 | man:babeltrace2(1) |
projects / lttng-tools.git / blame_incremental