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KDUMP(1) FreeBSD General Commands Manual KDUMP(1) NAME kdump - display kernel trace data SYNOPSIS kdump [-dHlnRTXx] [-f file] [-m maxdata] [-P program] [-p pid] [-t trstr] [-u label] DESCRIPTION kdump 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, unless overridden by the -f option. The options are as follows: -d Display all numbers in decimal. By default, values are printed out in hexadecimal. -f file Display the specified file instead of ktrace.out. Specifying `-' will read from standard input. -H Display thread identifiers. -l Loop reading the trace file, once the end-of-file is reached, waiting for more data. -m maxdata Display at most maxdata bytes when decoding I/O. -n 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. -P program Show output only for processes with program as their command name. -p pid Show output only for the pid specified. -R Display relative timestamps (time since previous entry). -T Display absolute timestamps for each entry (seconds since the Epoch). -TR If both options are specified, display timestamps relative to trace start. -t trstr Select which tracepoints to display. The argument can contain one or more of the following letters. By default all trace points except for X are enabled. c trace system calls i trace I/O n trace namei translations p trace violation of pledge(2) restrictions s trace signal processing S trace violation of pinsyscalls(2) t trace various structures u trace user data coming from utrace(2) x trace argument vector in execve(2) X trace environment in execve(2) + trace the default points -u label Display utrace(2) tracepoints having utrace(2) label label as strings with vis(3) escaping, without ktrace(2) header information. -X Display I/O data with hexadecimal data and printable ASCII characters side by side. -x Display I/O data in hexadecimal. The -t and -u options are mutually exclusive; the last one specified overrides any previous ones. FILES ktrace.out default ktrace dump file SEE ALSO ktrace(1) HISTORY The kdump command appeared in 4.3BSD-Reno. FreeBSD 14.1-RELEASE-p8 December 15, 2023 FreeBSD 14.1-RELEASE-p8