UNTITLED() LOCAL UNTITLED() 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 fea- tures the historical -fullname option of gdb(1). This is use- ful 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 ker- nel 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 session. 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 currently running kernel will be used. If no core dump file has been specified through either of the options or the last command-line argument, /dev/mem will be opened to allow debugging the currently 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 6.0 March 2, 2005 KGDB(1)
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