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kgdb(1)
NAME
kgdb -- kernel debugger
SYNOPSIS
kgdb [-a | -f | -fullname] [-q | -quiet] [-v] [-d crashdir]
[-c core | -n dumpnr | -r device] [kernel [core]]
DESCRIPTION
The kgdb utility is a debugger based on gdb(1) that allows debugging of
kernel core files.
The options are as follows:
-a Increase the annotation level. An annotation level of 1
features the historical -fullname option of gdb(1). This is
useful when running kgdb in Emacs. The -f or -fullname
options are supported for backward compatibility as well.
-q Suppress printing of the banner when the debugger starts.
The -quiet form is supported for compatibility as well.
-v Increase verbosity.
-d crashdir Use crashdir instead of the default, /var/crash to locate
kernel core dump files in. The name vmcore. plus the dump
number will be appended to determine the actual dump file
name.
-c core Explicitly use core as the core dump file.
-n dumpnr Use the kernel core dump file numbered dumpnr for debugging.
-r device Use device to connect kgdb to for a remote debugging ses-
sion.
The -c, -n, and -r options are mutually exclusive.
Optionally, the name of the kernel symbol file and the name of the core
dump file can be supplied on the command-line as positional arguments.
If no kernel symbol file name has been given, the symbol file of the cur-
rently running kernel will be used. If no core dump file has been speci-
fied through either of the options or the last command-line argument,
/dev/mem will be opened to allow debugging the currenlty running kernel.
FILES
/dev/mem Default memory image to open if no core dump file has been
specified.
/var/crash Default directory to locate kernel core dump files.
SEE ALSO
gdb(1)
HISTORY
The kgdb utility first appeared in its current form in FreeBSD 5.3.
FreeBSD 5.4 March 2, 2005 FreeBSD 5.4
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