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	.\" Carnegie Mellon University			.\" Carnegie Mellon University
	.\" Pittsburgh PA 15213-3890			.\" Pittsburgh PA 15213-3890
	.\"			.\"
	.\" any improvements or extensions that they make and grant Carnegie Mellon			.\" any improvements or extensions that they make and grant Carnegie Mellon
	.\" the rights to redistribute these changes.			.\" the rights to redistribute these changes.
	.\"			.\"
	.\" $FreeBSD$			.\" $FreeBSD$
	.\"			.\"
	.Dd October 17, 2019			.Dd November 19, 2020
	.Dt DDB 4			.Dt DDB 4
	.Os			.Os
	.Sh NAME			.Sh NAME
	.Nm ddb			.Nm ddb
	.Nd interactive kernel debugger			.Nd interactive kernel debugger
	.Sh SYNOPSIS			.Sh SYNOPSIS
	In order to enable kernel debugging facilities include:			In order to enable kernel debugging facilities include:
	.Bd -ragged -offset indent			.Bd -ragged -offset indent
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	if the			if the
	.Va debug.debugger_on_panic			.Va debug.debugger_on_panic
	.Xr sysctl 8			.Xr sysctl 8
	MIB variable is set non-zero,			MIB variable is set non-zero,
	which is the default			which is the default
	unless the			unless the
	.Dv KDB_UNATTENDED			.Dv KDB_UNATTENDED
	option is specified.			option is specified.
				Similarly, if the
				.Va debug.debugger_on_recursive_panic
				variable is set to
				.Dv 1 ,
				then the debugger will be invoked on a recursive kernel panic.
				This variable has a default value of
				.Dv 0 ,
				and has no effect if
				.Va debug.debugger_on_panic
				is already set non-zero.
	.Pp			.Pp
	The current location is called			The current location is called
	.Va dot .			.Va dot .
	The			The
	.Va dot			.Va dot
	is displayed with			is displayed with
	a hexadecimal format at a prompt.			a hexadecimal format at a prompt.
	The commands			The commands
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