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KDUMP(1) General Commands Manual KDUMP(1)

kdump — display kernel trace data

kdump [-acdjnlRT] [-f file] [-m maxdata] [-t [cnisuw]] [-p pid]

The kdump command displays the kernel trace files produced with ktrace(1) in human readable format. By default, the file ktrace.out in the current directory is displayed, which may be overridden by the -f option.

The options are as follows:

Display full human readable output. This option turns on -c and -R.
Display the cpu the thread is executing on.
Display all numbers in decimal.
Use a fixed format output, otherwise a more human readable output is used.
file
Display the specified file instead of ktrace.out.
Loop reading the trace file, once the end-of-file is reached, waiting for more data.
maxdata
Display at most maxdata bytes when decoding I/O; set to 0 to disable the size limit.
pid
Display only records for process pid.
Suppress ad hoc translations. Normally kdump tries to decode many system calls into a more human readable format. For example, ioctl(2) values are replaced with the macro name and errno values are replaced with the strerror(3) string. Suppressing this feature yields a more consistent output format and is easily amenable to further processing.
Display relative timestamps (time since previous entry).
Display absolute timestamps for each entry (seconds since epoch).
cnisuw
See the -t option of ktrace(1).

ktrace.out
default ktrace dump file

ktrace(1)

The kdump command appeared in 4.4BSD.

October 5, 2017 DragonFly-5.6.1