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KDUMP(1) FreeBSD General Commands Manual KDUMP(1) NAME kdump - display kernel trace data SYNOPSIS kdump [-dElNnRT] [-e emulation] [-f file] [-m maxdata] [-p pid] [-t trstr] [-x | -X size] [file] DESCRIPTION kdump displays the kernel trace files produced with ktrace(1) in human readable format. The file ktrace.out in the current directory is displayed, unless either the -f option is used, or a file name is supplied as the last argument. The options are as follows: -d Display all numbers in decimal. -E Display elapsed timestamps (time since beginning of trace). -e emulation If an emulation of a process is unknown, interpret system call maps assuming the named emulation instead of default "netbsd". -f file Display the specified file instead of ktrace.out. -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 system call number-to-name translation. -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 pid Only display records from the trace file that are for the indicated pid. -R Display relative timestamps (time since previous entry). -T Display absolute timestamps for each entry (seconds since epoch). -t trstr Restrict display to the specified set of kernel trace points. The default is to display everything in the file. See the -t option of ktrace(1). -x Display GIO data in hex and ascii instead of vis(3) format. -X size Same as -x but display hex values by groups of size bytes. Supported values are 1, 2, 4, 8, and 16. SEE ALSO ioctlprint(1), ktrace(1) HISTORY The kdump command appeared in 4.4BSD. FreeBSD 14.1-RELEASE-p8 April 2, 2020 FreeBSD 14.1-RELEASE-p8