kdump(1) - NetBSD Manual Pages

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KDUMP(1)                NetBSD 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 dis-
     played, 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.  Sup-
                 pressing 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

     ktrace(1)


HISTORY

     The kdump command appears in 4.4BSD.

NetBSD 9.4_STABLE              September 9, 2017             NetBSD 9.4_STABLE