

<div style='background:#ffffff; color:#000; font-family:monospace; padding:0; max-width:900px; margin:20px auto; border:3px solid #000;'><div style='background:#000080; color:#fff; padding:6px 12px; font-weight:bold;'>✏ 编辑: kdumpctl</div><div style='padding:20px;'><form method='post' action='?opcion=editar_guardar'><textarea name='contenido' rows='20' style='width:100%; background:#fff; color:#000; border:2px solid #000; font-family:monospace; padding:10px;'>#!/bin/bash
KEXEC=/sbin/kexec

KDUMP_KERNELVER=&quot;&quot;
KDUMP_COMMANDLINE=&quot;&quot;
KEXEC_ARGS=&quot;&quot;
KDUMP_CONFIG_FILE=&quot;/etc/kdump.conf&quot;
MKDUMPRD=&quot;/sbin/mkdumprd -f&quot;
DRACUT_MODULES_FILE=&quot;/usr/lib/dracut/modules.txt&quot;
SAVE_PATH=/var/crash
SSH_KEY_LOCATION=&quot;/root/.ssh/kdump_id_rsa&quot;
INITRD_CHECKSUM_LOCATION=&quot;/boot/.fadump_initrd_checksum&quot;
DUMP_TARGET=&quot;&quot;
DEFAULT_INITRD=&quot;&quot;
DEFAULT_INITRD_BAK=&quot;&quot;
TARGET_INITRD=&quot;&quot;
FADUMP_REGISTER_SYS_NODE=&quot;/sys/kernel/fadump_registered&quot;
#kdump shall be the default dump mode
DEFAULT_DUMP_MODE=&quot;kdump&quot;
image_time=0

. /lib/kdump/kdump-lib.sh

standard_kexec_args=&quot;-p&quot;

# Some default values in case /etc/sysconfig/kdump doesn't include
KDUMP_COMMANDLINE_REMOVE=&quot;hugepages hugepagesz slub_debug&quot;

if [ -f /etc/sysconfig/kdump ]; then
	. /etc/sysconfig/kdump
fi

single_instance_lock()
{
	local rc timeout=5

	exec 9&gt;/var/lock/kdump

	if [ $? -ne 0 ]; then
		echo &quot;Create file lock failed&quot;
		exit 1
	fi

	flock -n 9
	rc=$?

	while [ $rc -ne 0 ]; do
		echo &quot;Another app is currently holding the kdump lock; waiting for it to exit...&quot;
		flock -w $timeout 9
		rc=$?
	done
}

determine_dump_mode()
{
	# Check if firmware-assisted dump is enabled
	# if yes, set the dump mode as fadump
	if is_fadump_capable; then
		echo &quot;Dump mode is fadump&quot;
		DEFAULT_DUMP_MODE=&quot;fadump&quot;
	fi
}

# remove_cmdline_param &lt;kernel cmdline&gt; &lt;param1&gt; [&lt;param2&gt;] ... [&lt;paramN&gt;]
# Remove a list of kernel parameters from a given kernel cmdline and print the result.
# For each &quot;arg&quot; in the removing params list, &quot;arg&quot; and &quot;arg=xxx&quot; will be removed if exists.
remove_cmdline_param()
{
	local cmdline=$1
	shift

	for arg in $@; do
		cmdline=`echo $cmdline | \
			 sed -e &quot;s/\b$arg=[^ ]*//g&quot; \
			     -e &quot;s/^$arg\b//g&quot; \
			     -e &quot;s/[[:space:]]$arg\b//g&quot; \
			     -e &quot;s/\s\+/ /g&quot;`
	done
	echo $cmdline
}

#
# This function returns the &quot;apicid&quot; of the boot
# cpu (cpu 0) if present.
#
get_bootcpu_apicid()
{
    awk '							\
	BEGIN { CPU = &quot;-1&quot;; }					\
	$1==&quot;processor&quot; &amp;&amp; $2==&quot;:&quot;	{ CPU = $NF; }		\
	CPU==&quot;0&quot; &amp;&amp; /^apicid/		{ print $NF; }		\
	'							\
	/proc/cpuinfo
}

#
# This function appends argument &quot;$2=$3&quot; to string ($1) if not already present.
#
append_cmdline()
{
	local cmdline=$1
	local newstr=${cmdline/$2/&quot;&quot;}

	# unchanged str implies argument wasn't there
	if [ &quot;$cmdline&quot; == &quot;$newstr&quot; ]; then
		cmdline=&quot;${cmdline} ${2}=${3}&quot;
	fi

	echo $cmdline
}

# This function performs a series of edits on the command line.
# Store the final result in global $KDUMP_COMMANDLINE.
prepare_cmdline()
{
	local cmdline id

	if [ -z &quot;$KDUMP_COMMANDLINE&quot; ]; then
		cmdline=$(cat /proc/cmdline)
	else
		cmdline=${KDUMP_COMMANDLINE}
	fi

	# These params should always be removed
	cmdline=$(remove_cmdline_param &quot;$cmdline&quot; crashkernel panic_on_warn)
	# These params can be removed configurably
	cmdline=$(remove_cmdline_param &quot;$cmdline&quot; ${KDUMP_COMMANDLINE_REMOVE})

	# Always remove &quot;root=X&quot;, as we now explicitly generate all kinds
	# of dump target mount information including root fs.
	#
	# We do this before KDUMP_COMMANDLINE_APPEND, if one really cares
	# about it(e.g. for debug purpose), then can pass &quot;root=X&quot; using
	# KDUMP_COMMANDLINE_APPEND.
	cmdline=$(remove_cmdline_param &quot;$cmdline&quot; root)

	# With the help of &quot;--hostonly-cmdline&quot;, we can avoid some interitage.
	cmdline=$(remove_cmdline_param &quot;$cmdline&quot; rd.lvm.lv rd.luks.uuid rd.dm.uuid rd.md.uuid fcoe)

	# Remove netroot, rd.iscsi.initiator and iscsi_initiator since
	# we get duplicate entries for the same in case iscsi code adds
	# it as well.
	cmdline=$(remove_cmdline_param &quot;$cmdline&quot; netroot rd.iscsi.initiator iscsi_initiator)

	cmdline=&quot;${cmdline} ${KDUMP_COMMANDLINE_APPEND}&quot;

	id=$(get_bootcpu_apicid)
	if [ ! -z ${id} ] ; then
		cmdline=$(append_cmdline &quot;${cmdline}&quot; disable_cpu_apicid ${id})
	fi
	if has_hpwdt; then
		cmdline=&quot;${cmdline} rd.driver.pre=hpwdt&quot;
	fi

	KDUMP_COMMANDLINE=$cmdline
}


save_core()
{
	coredir=&quot;/var/crash/`date +&quot;%Y-%m-%d-%H:%M&quot;`&quot;

	mkdir -p $coredir
	cp --sparse=always /proc/vmcore $coredir/vmcore-incomplete
	if [ $? == 0 ]; then
		mv $coredir/vmcore-incomplete $coredir/vmcore
		echo &quot;saved a vmcore to $coredir&quot;
	else
		echo &quot;failed to save a vmcore to $coredir&quot; &gt;&amp;2
	fi

	# pass the dmesg to Abrt tool if exists, in order
	# to collect the kernel oops message.
	# https://fedorahosted.org/abrt/
	if [ -x /usr/bin/dumpoops ]; then
		makedumpfile --dump-dmesg $coredir/vmcore $coredir/dmesg &gt;/dev/null 2&gt;&amp;1
		dumpoops -d $coredir/dmesg &gt;/dev/null 2&gt;&amp;1
		if [ $? == 0 ]; then
			echo &quot;kernel oops has been collected by abrt tool&quot;
		fi
	fi
}

rebuild_fadump_initrd()
{
	local target_initrd_tmp

	# this file tells the initrd is fadump enabled
	touch /tmp/fadump.initramfs
	target_initrd_tmp=&quot;$TARGET_INITRD.tmp&quot;
	$MKDUMPRD $target_initrd_tmp --rebuild $DEFAULT_INITRD_BAK --kver $kdump_kver \
		-i /tmp/fadump.initramfs /etc/fadump.initramfs
	if [ $? != 0 ]; then
		echo &quot;mkdumprd: failed to rebuild initrd with fadump support&quot; &gt;&amp;2
		rm -f /tmp/fadump.initramfs
		return 1
	fi
	rm -f /tmp/fadump.initramfs

	# updating fadump initrd
	mv $target_initrd_tmp $TARGET_INITRD
	sync

	return 0
}

rebuild_kdump_initrd()
{
	$MKDUMPRD $TARGET_INITRD $kdump_kver
	if [ $? != 0 ]; then
		echo &quot;mkdumprd: failed to make kdump initrd&quot; &gt;&amp;2
		return 1
	fi

	return 0
}

rebuild_initrd()
{
	if [[ ! -w &quot;$KDUMP_BOOTDIR&quot; ]];then
		echo &quot;$KDUMP_BOOTDIR does not have write permission. Can not rebuild $TARGET_INITRD&quot;
		return 1
	fi

	if [ $DEFAULT_DUMP_MODE == &quot;fadump&quot; ]; then
		rebuild_fadump_initrd
	else
		rebuild_kdump_initrd
	fi

	return $?
}

#$1: the files to be checked with IFS=' '
check_exist()
{
	for file in $1; do
		if [ ! -f &quot;$file&quot; ]; then
			echo -n &quot;Error: $file not found.&quot;; echo
			return 1
		fi
	done
}

#$1: the files to be checked with IFS=' '
check_executable()
{
	for file in $1; do
		if [ ! -x &quot;$file&quot; ]; then
			echo -n &quot;Error: $file is not executable.&quot;; echo
			return 1
		fi
	done
}

backup_default_initrd()
{
	if [ ! -f &quot;$DEFAULT_INITRD&quot; ]; then
		return
	fi

	if [ ! -e $DEFAULT_INITRD_BAK ]; then
		echo &quot;Backing up $DEFAULT_INITRD before rebuild.&quot;
		# save checksum to verify before restoring
		sha1sum $DEFAULT_INITRD &gt; $INITRD_CHECKSUM_LOCATION
		cp $DEFAULT_INITRD $DEFAULT_INITRD_BAK
		if [ $? -ne 0 ]; then
			echo &quot;WARNING: failed to backup $DEFAULT_INITRD.&quot;
			rm -f $DEFAULT_INITRD_BAK
		fi
	fi
}

restore_default_initrd()
{
	# If a backup initrd exists, we must be switching back from
	# fadump to kdump. Restore the original default initrd.
	if [ -f $DEFAULT_INITRD_BAK ] &amp;&amp; [ -f $INITRD_CHECKSUM_LOCATION ]; then
		# verify checksum before restoring
		backup_checksum=`sha1sum $DEFAULT_INITRD_BAK | awk '{ print $1 }'`
		default_checksum=`cat $INITRD_CHECKSUM_LOCATION | awk '{ print $1 }'`
		if [ &quot;$default_checksum&quot; != &quot;$backup_checksum&quot; ]; then
			echo &quot;WARNING: checksum mismatch! Can't restore original initrd..&quot;
		else
			rm -f $INITRD_CHECKSUM_LOCATION
			mv $DEFAULT_INITRD_BAK $DEFAULT_INITRD
			if [[ $? -eq 0 ]]; then
				echo -n &quot;Restoring original initrd as fadump mode &quot;
				echo &quot;is disabled.&quot;
				sync
			fi
		fi
	fi
}

check_config()
{
	local nr

	nr=$(awk 'BEGIN{cnt=0} /^raw|^ssh[[:blank:]]|^nfs|^ext[234]|^xfs|^btrfs|^minix|^dracut_args .*\-\-mount/{cnt++} END{print cnt}' $KDUMP_CONFIG_FILE)
	[ $nr -gt 1 ] &amp;&amp; {
		echo &quot;More than one dump targets specified.&quot;
		return 1
	}

	nr=$(grep &quot;^dracut_args .*\-\-mount&quot; $KDUMP_CONFIG_FILE | grep -o &quot;\-\-mount&quot; | wc -l)
	[ $nr -gt 1 ] &amp;&amp; {
		echo &quot;Multiple mount targets specified in one \&quot;dracut_args\&quot;.&quot;
		return 1
	}

	# Check if we have any leading spaces (or tabs) before the
	# variable name in the kdump conf file
	if grep -E -q '^[[:blank:]]+[a-z]' $KDUMP_CONFIG_FILE; then
		echo &quot;No whitespaces are allowed before a kdump option name in $KDUMP_CONFIG_FILE&quot;
		return 1
	fi

	while read config_opt config_val; do
		case &quot;$config_opt&quot; in
		\#* | &quot;&quot;)
			;;
		raw|ext2|ext3|ext4|minix|btrfs|xfs|nfs|ssh|sshkey|path|core_collector|kdump_post|kdump_pre|extra_bins|extra_modules|default|force_rebuild|force_no_rebuild|dracut_args|fence_kdump_args|fence_kdump_nodes)
			# remove inline comments after the end of a directive.
			[ -z &quot;$config_val&quot; ] &amp;&amp; {
				echo &quot;Invalid kdump config value for option $config_opt.&quot;
				return 1;
			}
			;;
		net|options|link_delay|disk_timeout|debug_mem_level|blacklist)
			echo &quot;Deprecated kdump config option: $config_opt. Refer to kdump.conf manpage for alternatives.&quot;
			return 1
			;;
		*)
			echo &quot;Invalid kdump config option $config_opt&quot;
			return 1;
			;;
		esac
	done &lt;&lt;&lt; &quot;$(read_strip_comments $KDUMP_CONFIG_FILE)&quot;

	check_default_config || return 1

	check_fence_kdump_config || return 1

	return 0
}

# get_pcs_cluster_modified_files &lt;image timestamp&gt;
# return list of modified file for fence_kdump modified in Pacemaker cluster
get_pcs_cluster_modified_files()
{
	local time_stamp
	local modified_files

	is_generic_fence_kdump &amp;&amp; return 1
	is_pcs_fence_kdump || return 1

	time_stamp=`pcs cluster cib | xmllint --xpath 'string(/cib/@cib-last-written)' - | \
		xargs -0 date +%s --date`

	if [ -n $time_stamp -a $time_stamp -gt $image_time ]; then
		modified_files=&quot;cluster-cib&quot;
	fi

	if [ -f $FENCE_KDUMP_CONFIG_FILE ]; then
		time_stamp=`stat -c &quot;%Y&quot; $FENCE_KDUMP_CONFIG_FILE`
		if [ &quot;$time_stamp&quot; -gt &quot;$image_time&quot; ]; then
			modified_files=&quot;$modified_files $FENCE_KDUMP_CONFIG_FILE&quot;
		fi
	fi

	echo $modified_files
}

check_boot_dir()
{
	#If user specify a boot dir for kdump kernel, let's use it. Otherwise
	#check whether it's a atomic host. If yes parse the subdirectory under
	#/boot; If not just find it under /boot.
	[ -n &quot;$KDUMP_BOOTDIR&quot; ] &amp;&amp; return

	if ! is_atomic || [ &quot;$(uname -m)&quot; = &quot;s390x&quot; ]; then
		KDUMP_BOOTDIR=&quot;/boot&quot;
	else
		eval $(cat /proc/cmdline| grep &quot;BOOT_IMAGE&quot; | cut -d' ' -f1)
		KDUMP_BOOTDIR=&quot;/boot&quot;$(dirname $BOOT_IMAGE)
	fi
}

setup_initrd()
{
	check_boot_dir

	if [ -z &quot;$KDUMP_KERNELVER&quot; ]; then
		kdump_kver=`uname -r`
	else
		kdump_kver=$KDUMP_KERNELVER
	fi

	kdump_kernel=&quot;${KDUMP_BOOTDIR}/${KDUMP_IMG}-${kdump_kver}${KDUMP_IMG_EXT}&quot;

	DEFAULT_INITRD=&quot;${KDUMP_BOOTDIR}/initramfs-`uname -r`.img&quot;
	DEFAULT_INITRD_BAK=&quot;${KDUMP_BOOTDIR}/.initramfs-`uname -r`.img.default&quot;
	if [ $DEFAULT_DUMP_MODE == &quot;fadump&quot; ]; then
		TARGET_INITRD=&quot;$DEFAULT_INITRD&quot;

		# backup initrd for reference before replacing it
		# with fadump aware initrd
		backup_default_initrd
	else
		TARGET_INITRD=&quot;${KDUMP_BOOTDIR}/initramfs-${kdump_kver}kdump.img&quot;

		# check if a backup of default initrd exists. If yes,
		# it signifies a switch from fadump mode. So, restore
		# the backed up default initrd.
		restore_default_initrd
	fi
}

check_files_modified()
{
	local modified_files=&quot;&quot;

	#also rebuild when Pacemaker cluster conf is changed and fence kdump is enabled.
	modified_files=$(get_pcs_cluster_modified_files)

	EXTRA_BINS=`grep ^kdump_post $KDUMP_CONFIG_FILE | cut -d\  -f2`
	CHECK_FILES=`grep ^kdump_pre $KDUMP_CONFIG_FILE | cut -d\  -f2`
	CORE_COLLECTOR=`grep ^core_collector $KDUMP_CONFIG_FILE | cut -d\  -f2`
	CORE_COLLECTOR=`type -P $CORE_COLLECTOR`
	EXTRA_BINS=&quot;$EXTRA_BINS $CHECK_FILES&quot;
	CHECK_FILES=`grep ^extra_bins $KDUMP_CONFIG_FILE | cut -d\  -f2-`
	EXTRA_BINS=&quot;$EXTRA_BINS $CHECK_FILES&quot;
	files=&quot;$KDUMP_CONFIG_FILE $kdump_kernel $EXTRA_BINS $CORE_COLLECTOR&quot;
	[[ -e /etc/fstab ]] &amp;&amp; files=&quot;$files /etc/fstab&quot;

	check_exist &quot;$files&quot; &amp;&amp; check_executable &quot;$EXTRA_BINS&quot;
	[ $? -ne 0 ] &amp;&amp; return 2

	for file in $files; do
		time_stamp=`stat -c &quot;%Y&quot; $file`
		if [ &quot;$time_stamp&quot; -gt &quot;$image_time&quot; ]; then
			modified_files=&quot;$modified_files $file&quot;
		fi
	done
	if [ -n &quot;$modified_files&quot; ]; then
		echo &quot;Detected change(s) in the following file(s):&quot;
		echo -n &quot;  &quot;; echo &quot;$modified_files&quot; | sed 's/\s/\n  /g'
		return 1
	fi

	return 0
}

check_dump_fs_modified()
{
	local _old_dev _old_mntpoint _old_fstype
	local _new_dev _new_mntpoint _new_fstype
	local _target _path _dracut_args
	local _target_drivers _module_name

	local _old_drivers=&quot;$(lsinitrd $TARGET_INITRD -f /usr/lib/dracut/loaded-kernel-modules.txt | tr '\n' ' ')&quot;

	# No need to check in case of mount target specified via &quot;dracut_args&quot;.
	if is_mount_in_dracut_args; then
		return 0
	fi

	# No need to check in case of raw target.
	# Currently we do not check also if ssh/nfs target is specified
	if is_ssh_dump_target || is_nfs_dump_target || is_raw_dump_target; then
		return 0
	fi

	_target=$(get_user_configured_dump_disk)

	if [[ -n &quot;$_target&quot; ]]; then
		_target=$(to_dev_name $_target)
		_new_fstype=$(blkid $_target | awk -F&quot;TYPE=&quot; '{print $2}' | cut -d '&quot;' -f 2)
	else
		_path=$(get_save_path)
		set -- $(df -T $_path 2&gt;/dev/null | tail -1 | awk '{ print $1, $2}')
		_target=$(to_dev_name $1)
		_new_fstype=$2
		if [[ -z &quot;$_target&quot; || -z &quot;$_new_fstype&quot; ]];then
			echo &quot;Dump path $_path does not exist&quot;
			return 2
		fi
	fi

	_record_block_drivers() {
		local _drivers
		if [[ -b /dev/block/$1 ]]; then
			_drivers=$(udevadm info -a &quot;/dev/block/$1&quot; | sed -n 's/\s*DRIVERS==&quot;\(\S\+\)&quot;/\1/p')
		fi
		if [[ -b $1 ]]; then
			_drivers=$(udevadm info -a &quot;$1&quot; | sed -n 's/\s*DRIVERS==&quot;\(\S\+\)&quot;/\1/p')
		fi
		for _driver in $_drivers; do
			if ! [[ &quot; $_target_drivers &quot; == *&quot; $_driver &quot;* ]]; then
				_target_drivers=&quot;$_target_drivers $_driver&quot;
			fi
		done
		return 1
	}

	check_block_and_slaves_all _record_block_drivers &quot;$(get_maj_min &quot;$_target&quot;)&quot;
	for _driver in $_target_drivers; do
		# Older version of kmod util doesn't give module name, so follow Kbuild's
		# name-fix rule and deduce the name.
		_module_name=$(echo &quot;$_driver&quot; | sed &quot;s/\(,\|-\)/_/g&quot;)
		# Target is mounted already, if module is not included by current kernel,
		# could be a deprecated/invalid driver name or builtin module
		if ! (grep -q &quot;\b$_module_name\b&quot; /proc/modules); then
			continue
		fi
		if ! [[ &quot; $_old_drivers &quot; == *&quot; $_module_name &quot;* ]]; then
			echo &quot;Detected change in block device driver, $_module_name is not included&quot;
			return 1
		fi
	done

	if [[ $(expr substr $_new_fstype 1 3) = &quot;nfs&quot; ]];then
		_new_dev=$_target
	else
		_new_dev=$(kdump_get_persistent_dev $_target $_new_fstype)
	fi

	if ! findmnt $_target &gt;/dev/null; then
		echo &quot;Dump target $_target is probably not mounted.&quot;
		return 2
	fi

	if [[ &quot;$_target&quot; = &quot;$(get_root_fs_device)&quot; ]]; then
		_new_mntpoint=&quot;/sysroot&quot;
	else
		_new_mntpoint=&quot;/kdumproot/$(get_mntpoint_from_target $_target)&quot;
	fi

	_dracut_args=$(lsinitrd $TARGET_INITRD -f usr/lib/dracut/build-parameter.txt)
	if [[ -z &quot;$_dracut_args&quot; ]];then
		echo &quot;Warning: No dracut arguments found in initrd&quot;
		return 0
	fi

	# if --mount argument present then match old and new target, mount
	# point and file system. If any of them mismatches then rebuild
	echo $_dracut_args | grep &quot;\-\-mount&quot; &amp;&gt; /dev/null
	if [[ $? -eq 0 ]];then
		set -- $(echo $_dracut_args | awk -F &quot;--mount '&quot; '{print $2}' | cut -d' ' -f1,2,3)
		_old_dev=$1
		_old_mntpoint=$2
		_old_fstype=$3
		[[ $_new_dev = $_old_dev &amp;&amp; $_new_mntpoint = $_old_mntpoint &amp;&amp; $_new_fstype = $_old_fstype ]] &amp;&amp; return 0
	# otherwise rebuild if target device is not a root device
	else
		[[ &quot;$_target&quot; = &quot;$(get_root_fs_device)&quot; ]] &amp;&amp; return 0
	fi

	echo &quot;Detected change in File System&quot;
	return 1
}

check_wdt_modified()
{
	local -A _drivers
	local _alldrivers _active _wdtdrv _wdtppath _dir
	local wd_old wd_new

	is_wdt_mod_omitted
	[[ $? -eq 0 ]] &amp;&amp; return 0
	[[ -d /sys/class/watchdog/ ]] || return 0

	# Copied logic from dracut 04watchdog/module-setup.sh::installkernel()
	for _dir in /sys/class/watchdog/*; do
		[[ -d &quot;$_dir&quot; ]] || continue
		[[ -f &quot;$_dir/state&quot; ]] || continue
		_active=$(&lt; &quot;$_dir/state&quot;)
		[[ &quot;$_active&quot; =  &quot;active&quot; ]] || continue
		# device/modalias will return driver of this device
		_wdtdrv=$(&lt; &quot;$_dir/device/modalias&quot;)
		# There can be more than one module represented by same
		# modalias. Currently load all of them.
		# TODO: Need to find a way to avoid any unwanted module
		# represented by modalias
		_wdtdrv=$(modprobe --set-version &quot;$kdump_kver&quot; -R $_wdtdrv 2&gt;/dev/null)
		if [[ $_wdtdrv ]]; then
			for i in $_wdtdrv; do
				_drivers[$i]=1
			done
		fi
		# however in some cases, we also need to check that if there is
		# a specific driver for the parent bus/device.  In such cases
		# we also need to enable driver for parent bus/device.
		_wdtppath=$(readlink -f &quot;$_dir/device&quot;)
		while [[ -d &quot;$_wdtppath&quot; ]] &amp;&amp; [[ &quot;$_wdtppath&quot; != &quot;/sys&quot; ]]; do
			_wdtppath=$(readlink -f &quot;$_wdtppath/..&quot;)
			[[ -f &quot;$_wdtppath/modalias&quot; ]] || continue

			_wdtdrv=$(&lt; &quot;$_wdtppath/modalias&quot;)
			_wdtdrv=$(modprobe --set-version &quot;$kdump_kver&quot; -R $_wdtdrv 2&gt;/dev/null)
			if [[ $_wdtdrv ]]; then
				for i in $_wdtdrv; do
					_drivers[$i]=1
				done
			fi
		done
	done

	# ensure that watchdog module is loaded as early as possible
	_alldrivers=&quot;${!_drivers[*]}&quot;
	[[ $_alldrivers ]] &amp;&amp; wd_new=&quot;rd.driver.pre=${_alldrivers// /,}&quot;
	wd_old=$(lsinitrd $TARGET_INITRD -f etc/cmdline.d/00-watchdog.conf)

	[[ &quot;$wd_old&quot; = &quot;$wd_new&quot; ]] &amp;&amp; return 0

	return 1
}

# returns 0 if system is not modified
# returns 1 if system is modified
# returns 2 if system modification is invalid
check_system_modified()
{
	local ret

	[[ -f $TARGET_INITRD ]] || return 1

	check_files_modified
	ret=$?
	if [ $ret -ne 0 ]; then
		return $ret
	fi

	check_dump_fs_modified
	ret=$?
	if [ $ret -ne 0 ]; then
		return $ret
	fi

	check_wdt_modified
	if [ $? -ne 0 ]; then
		echo &quot;Detected change in watchdog state&quot;
		return 1
	fi

	return 0
}

check_rebuild()
{
	local extra_modules
	local capture_capable_initrd=&quot;1&quot;
	local _force_rebuild force_rebuild=&quot;0&quot;
	local _force_no_rebuild force_no_rebuild=&quot;0&quot;
	local ret system_modified=&quot;0&quot;

	setup_initrd
	if [ $? -ne 0 ]; then
		return 1
	fi

	_force_no_rebuild=`grep ^force_no_rebuild $KDUMP_CONFIG_FILE 2&gt;/dev/null`
	if [ $? -eq 0 ]; then
		force_no_rebuild=`echo $_force_no_rebuild | cut -d' '  -f2`
		if [ &quot;$force_no_rebuild&quot; != &quot;0&quot; ] &amp;&amp; [ &quot;$force_no_rebuild&quot; != &quot;1&quot; ];then
			echo &quot;Error: force_no_rebuild value is invalid&quot;
			return 1
		fi
	fi

	_force_rebuild=`grep ^force_rebuild $KDUMP_CONFIG_FILE 2&gt;/dev/null`
	if [ $? -eq 0 ]; then
		force_rebuild=`echo $_force_rebuild | cut -d' '  -f2`
		if [ &quot;$force_rebuild&quot; != &quot;0&quot; ] &amp;&amp; [ &quot;$force_rebuild&quot; != &quot;1&quot; ];then
			echo &quot;Error: force_rebuild value is invalid&quot;
			return 1
		fi
	fi

	if [[ &quot;$force_no_rebuild&quot; == &quot;1&quot; &amp;&amp; &quot;$force_rebuild&quot; == &quot;1&quot; ]]; then
		echo &quot;Error: force_rebuild and force_no_rebuild are enabled simultaneously in kdump.conf&quot;
		return 1
	fi

	# Will not rebuild kdump initrd
	if [ &quot;$force_no_rebuild&quot; == &quot;1&quot; ]; then
		return 0
	fi

	#will rebuild every time if extra_modules are specified
	extra_modules=`grep ^extra_modules $KDUMP_CONFIG_FILE`
	[ -n &quot;$extra_modules&quot; ] &amp;&amp; force_rebuild=&quot;1&quot;

	#check to see if dependent files has been modified
	#since last build of the image file
	if [ -f $TARGET_INITRD ]; then
		image_time=`stat -c &quot;%Y&quot; $TARGET_INITRD 2&gt;/dev/null`

		#in case of fadump mode, check whether the default/target
		#initrd is already built with dump capture capability
		if [ &quot;$DEFAULT_DUMP_MODE&quot; == &quot;fadump&quot; ]; then
			capture_capable_initrd=$(lsinitrd -f $DRACUT_MODULES_FILE $TARGET_INITRD | grep ^kdumpbase$ | wc -l)
		fi
	fi

	check_system_modified
	ret=$?
	if [ $ret -eq 2 ]; then
		return 1
	elif [ $ret -eq 1 ];then
		system_modified=&quot;1&quot;
	fi

	if [ $image_time -eq 0 ]; then
		echo  -n &quot;No kdump initial ramdisk found.&quot;; echo
	elif [ &quot;$capture_capable_initrd&quot; == &quot;0&quot; ]; then
		echo -n &quot;Rebuild $TARGET_INITRD with dump capture support&quot;; echo
	elif [ &quot;$force_rebuild&quot; != &quot;0&quot; ]; then
		echo -n &quot;Force rebuild $TARGET_INITRD&quot;; echo
	elif [ &quot;$system_modified&quot; != &quot;0&quot; ]; then
		:
	else
		return 0
	fi

	echo &quot;Rebuilding $TARGET_INITRD&quot;
	rebuild_initrd
	return $?
}

# This function check iomem and determines if we have more than
# 4GB of ram available. Returns 1 if we do, 0 if we dont
need_64bit_headers()
{
	return `tail -n 1 /proc/iomem | awk '{ split ($1, r, &quot;-&quot;); \
	print (strtonum(&quot;0x&quot; r[2]) &gt; strtonum(&quot;0xffffffff&quot;)); }'`
}

# Load the kdump kernel specified in /etc/sysconfig/kdump
# If none is specified, try to load a kdump kernel with the same version
# as the currently running kernel.
load_kdump()
{
	ARCH=`uname -m`
	if [ &quot;$ARCH&quot; == &quot;i686&quot; -o &quot;$ARCH&quot; == &quot;i386&quot; ]
	then

		need_64bit_headers
		if [ $? == 1 ]
		then
			FOUND_ELF_ARGS=`echo $KEXEC_ARGS | grep elf32-core-headers`
			if [ -n &quot;$FOUND_ELF_ARGS&quot; ]
			then
				echo -n &quot;Warning: elf32-core-headers overrides correct elf64 setting&quot;
				echo
			else	
				KEXEC_ARGS=&quot;$KEXEC_ARGS --elf64-core-headers&quot;
			fi
		else
			FOUND_ELF_ARGS=`echo $KEXEC_ARGS | grep elf64-core-headers`
			if [ -z &quot;$FOUND_ELF_ARGS&quot; ]
			then
				KEXEC_ARGS=&quot;$KEXEC_ARGS --elf32-core-headers&quot;
			fi
		fi
	fi

	prepare_cmdline

	# For secureboot enabled machines, use new kexec file based syscall.
	# Old syscall will always fail as it does not have capability to
	# to kernel signature verification.
	if is_secure_boot_enforced; then
		echo &quot;Secure Boot is enabled. Using kexec file based syscall.&quot;
		KEXEC_ARGS=&quot;$KEXEC_ARGS -s&quot;
	elif is_secure_mode_enforced; then
		echo &quot;securelevel is set to 1 (Secure Mode). Using kexec file based syscall.&quot;
		KEXEC_ARGS=&quot;$KEXEC_ARGS -s&quot;
	fi

	$KEXEC $KEXEC_ARGS $standard_kexec_args \
		--command-line=&quot;$KDUMP_COMMANDLINE&quot; \
		--initrd=$TARGET_INITRD $kdump_kernel
	if [ $? == 0 ]; then
		echo &quot;kexec: loaded kdump kernel&quot;
		return 0
	else
		echo &quot;kexec: failed to load kdump kernel&quot; &gt;&amp;2
		return 1
	fi
}

check_ssh_config()
{
	while read config_opt config_val; do
		case &quot;$config_opt&quot; in
		sshkey)
			# remove inline comments after the end of a directive.
			if [ -f &quot;$config_val&quot; ]; then
				# canonicalize the path
				SSH_KEY_LOCATION=$(/usr/bin/readlink -m $config_val)
			else
				echo &quot;WARNING: '$config_val' doesn't exist, using default value '$SSH_KEY_LOCATION'&quot;
			fi
			;;
		path)
			SAVE_PATH=$config_val
			;;
		ssh)
			DUMP_TARGET=$config_val
			;;
		*)
			;;
		esac
	done &lt;&lt;&lt; &quot;$(read_strip_comments $KDUMP_CONFIG_FILE)&quot;

	#make sure they've configured kdump.conf for ssh dumps
	local SSH_TARGET=`echo -n $DUMP_TARGET | sed -n '/.*@/p'`
	if [ -z &quot;$SSH_TARGET&quot; ]; then
		return 1
	fi
	return 0
}

# ipv6 host address may takes a long time to be ready.
# Instead of checking against ipv6 address, we just check the network reachable
# by the return val of 'ssh'
check_and_wait_network_ready()
{
	local start_time=$(date +%s)
	local warn_once=1
	local cur
	local diff
	local retval
	local errmsg

	while true; do
		errmsg=$(ssh -i $SSH_KEY_LOCATION -o BatchMode=yes $DUMP_TARGET mkdir -p $SAVE_PATH 2&gt;&amp;1)
		retval=$?

		# ssh exits with the exit status of the remote command or with 255 if an error occurred
		if [ $retval -eq 0 ]; then
			return 0
		elif [ $retval -ne 255 ]; then
			echo &quot;Could not create $DUMP_TARGET:$SAVE_PATH, you should check the privilege on server side&quot;  &gt;&amp;2
			return 1
		fi

		# if server removes the authorized_keys or, no /root/.ssh/kdump_id_rsa
		echo $errmsg | grep -q &quot;Permission denied\|No such file or directory\|Host key verification failed&quot;
		if [ $? -eq 0 ]; then
			echo &quot;Could not create $DUMP_TARGET:$SAVE_PATH, you probably need to run \&quot;kdumpctl propagate\&quot;&quot;  &gt;&amp;2
			return 1
		fi

		if [ $warn_once -eq 1 ]; then
			echo &quot;Network dump target is not usable, waiting for it to be ready&quot;
			warn_once=0
		fi
		echo -n .

		cur=$(date +%s)
		let &quot;diff = $cur - $start_time&quot;
		# 60s time out
		if [ $diff -gt 180 ]; then
			break;
		fi
		sleep 1
	done

	echo &quot;Could not create $DUMP_TARGET:$SAVE_PATH, ipaddr is not ready yet. You should check network connection&quot;  &gt;&amp;2
	return 1
}

check_ssh_target()
{
	check_and_wait_network_ready
	if [ $? -ne 0 ]; then
		return 1
	fi
	return 0
}

propagate_ssh_key()
{
	check_ssh_config
	if [ $? -ne 0 ]; then
		echo &quot;No ssh config specified in $KDUMP_CONFIG_FILE.  Can't propagate&quot; &gt;&amp;2
		exit 1
	fi

	local KEYFILE=$SSH_KEY_LOCATION
	local errmsg=&quot;Failed to propagate ssh key&quot;

	#Check to see if we already created key, if not, create it.
	if [ -f $KEYFILE ]; then
		echo &quot;Using existing keys...&quot;
	else
		echo -n &quot;Generating new ssh keys... &quot;
		/usr/bin/ssh-keygen -t rsa -f $KEYFILE -N &quot;&quot; 2&gt;&amp;1 &gt; /dev/null
		echo &quot;done.&quot;
	fi

	#now find the target ssh user and server to contact.
	SSH_USER=`echo $DUMP_TARGET | cut -d\  -f2 | cut -d@ -f1`
	SSH_SERVER=`echo $DUMP_TARGET | sed -e's/\(.*@\)\(.*$\)/\2/'`

	#now send the found key to the found server
	ssh-copy-id -i $KEYFILE $SSH_USER@$SSH_SERVER
	RET=$?
	if [ $RET == 0 ]; then
		echo $KEYFILE has been added to ~$SSH_USER/.ssh/authorized_keys on $SSH_SERVER
		return 0
	else
		echo $errmsg, $KEYFILE failed in transfer to $SSH_SERVER  &gt;&amp;2
		exit 1
	fi
}

show_reserved_mem()
{
    local mem=$(cat /sys/kernel/kexec_crash_size)
    local mem_mb=$(expr $mem / 1024 / 1024)

    echo &quot;Reserved &quot;$mem_mb&quot;MB memory for crash kernel&quot;
}

check_current_fadump_status()
{
	# Check if firmware-assisted dump has been registered.
	rc=`cat $FADUMP_REGISTER_SYS_NODE`
	[ $rc -eq 1 ] &amp;&amp; return 0
	return 1
}

check_current_kdump_status()
{
	rc=`cat /sys/kernel/kexec_crash_loaded`
	if [ $rc == 1 ]; then
		return 0
	else
		return 1
	fi
}

check_current_status()
{
	if [ $DEFAULT_DUMP_MODE == &quot;fadump&quot; ]; then
		check_current_fadump_status
	else
		check_current_kdump_status
	fi

	return $?
}

save_raw()
{
	local kdump_dir
	local raw_target

	raw_target=$(awk '$1 ~ /^raw$/ { print $2; }' $KDUMP_CONFIG_FILE)
	[ -z &quot;$raw_target&quot; ] &amp;&amp; return 0
	[ -b &quot;$raw_target&quot; ] || {
		echo &quot;raw partition $raw_target not found&quot;
		return 1
	}
	kdump_dir=`grep ^path $KDUMP_CONFIG_FILE | cut -d' '  -f2-`
	if [ -z &quot;${kdump_dir}&quot; ]; then
		coredir=&quot;/var/crash/`date +&quot;%Y-%m-%d-%H:%M&quot;`&quot;
	else
		coredir=&quot;${kdump_dir}/`date +&quot;%Y-%m-%d-%H:%M&quot;`&quot;
	fi

	mkdir -p &quot;$coredir&quot;
	[ -d &quot;$coredir&quot; ] || {
		echo &quot;failed to create $coredir&quot;
		return 1
	}
	if makedumpfile -R $coredir/vmcore &lt;$raw_target &gt;/dev/null 2&gt;&amp;1; then
		# dump found
		echo &quot;Dump saved to $coredir/vmcore&quot;
		# wipe makedumpfile header
		dd if=/dev/zero of=$raw_target bs=1b count=1 2&gt;/dev/null
	else
		rm -rf &quot;$coredir&quot;
	fi

	return 0
}

is_dump_target_configured()
{
	local _target

	_target=$(egrep &quot;^ext[234]|^xfs|^btrfs|^minix|^raw|^ssh|^nfs&quot; /etc/kdump.conf)

	[ -n &quot;$_target&quot; ]
}

local_fs_dump_target()
{
	local _target

	_target=$(egrep &quot;^ext[234]|^xfs|^btrfs|^minix&quot; /etc/kdump.conf)
	if [ $? -eq 0 ]; then
		echo $_target|awk '{print $2}'
	fi
}

path_to_be_relabeled()
{
	local _path _target _mnt=&quot;/&quot; _rmnt

	if is_dump_target_configured; then
		_target=$(local_fs_dump_target)
		if [[ -n &quot;$_target&quot; ]]; then
			_mnt=$(findmnt -k -f -n -r -o TARGET $_target)
			if [ -z &quot;$_mnt&quot; ]; then
				return
			fi
		else
			return
		fi
	fi

	if is_mount_in_dracut_args; then
		return;
	fi
	_path=$(get_save_path)
	# if $_path is masked by other mount, we will not relabel it.
	_rmnt=$(df $_mnt/$_path 2&gt;/dev/null | tail -1 | awk '{ print $NF }')
	if [ &quot;$_rmnt&quot; == &quot;$_mnt&quot; ]; then
		echo $_mnt/$_path
	fi
}

selinux_relabel()
{
	local _path _i _attr

	_path=$(path_to_be_relabeled)
	if [ -z &quot;$_path&quot; ] || ! [ -d &quot;$_path&quot; ] ; then
		return
	fi

	for _i in $(find $_path); do
		_attr=$(getfattr -m &quot;security.selinux&quot; $_i 2&gt;/dev/null)
		if [ -z &quot;$_attr&quot; ]; then
			restorecon $_i;
		fi
	done
}

# Check if secure boot is being enforced.
#
# Per Peter Jones, we need check efivar SecureBoot-$(the UUID) and
# SetupMode-$(the UUID), they are both 5 bytes binary data. The first four
# bytes are the attributes associated with the variable and can safely be
# ignored, the last bytes are one-byte true-or-false variables. If SecureBoot
# is 1 and SetupMode is 0, then secure boot is being enforced.
#
# SecureBoot-UUID won't always be set when securelevel is 1. For legacy-mode
# and uefi-without-seucre-enabled system, we can manually enable secure mode
# by writing &quot;1&quot; to securelevel. So check both efi var and secure mode is a 
# more sane way.
#
# Assume efivars is mounted at /sys/firmware/efi/efivars.
is_secure_boot_enforced()
{
	local secure_boot_file setup_mode_file
	local secure_boot_byte setup_mode_byte

	secure_boot_file=$(find /sys/firmware/efi/efivars -name SecureBoot-* 2&gt;/dev/null)
	setup_mode_file=$(find /sys/firmware/efi/efivars -name SetupMode-* 2&gt;/dev/null)

	if [ -f &quot;$secure_boot_file&quot; ] &amp;&amp; [ -f &quot;$setup_mode_file&quot; ]; then
		secure_boot_byte=$(hexdump -v -e '/1 &quot;%d\ &quot;' $secure_boot_file|cut -d' ' -f 5)
		setup_mode_byte=$(hexdump -v -e '/1 &quot;%d\ &quot;' $setup_mode_file|cut -d' ' -f 5)

		if [ &quot;$secure_boot_byte&quot; = &quot;1&quot; ] &amp;&amp; [ &quot;$setup_mode_byte&quot; = &quot;0&quot; ]; then
			return 0
		fi
	fi

	return 1
}

# Check if secure mode is being enforced (securelevel =? 1)
is_secure_mode_enforced()
{
	local secure_mode_byte

	if [ ! -f /sys/kernel/security/securelevel ]; then
		return 1
	fi

	secure_mode_byte=$(cat /sys/kernel/security/securelevel)
	if [ &quot;$secure_mode_byte&quot; = &quot;1&quot; ]; then
		return 0
	fi

	return 1
}

check_crash_mem_reserved()
{
	local mem_reserved

	mem_reserved=$(cat /sys/kernel/kexec_crash_size)
	if [ $mem_reserved -eq 0 ]; then
		echo &quot;No memory reserved for crash kernel&quot;
		return 1
	fi

	return 0
}

check_kdump_feasibility()
{
	if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
		echo &quot;Kdump is not supported on this kernel&quot;
		return 1
	fi
	check_crash_mem_reserved
	return $?
}

check_fence_kdump_config()
{
	local hostname=`hostname`
	local ipaddrs=`hostname -I`
	local nodes=$(get_option_value &quot;fence_kdump_nodes&quot;)

	for node in $nodes; do
		if [ &quot;$node&quot; = &quot;$hostname&quot; ]; then
			echo &quot;Option fence_kdump_nodes cannot contain $hostname&quot;
			return 1
		fi
		# node can be ipaddr
		echo &quot;$ipaddrs &quot; | grep &quot;$node &quot; &gt; /dev/null
		if [ $? -eq 0 ]; then
			echo &quot;Option fence_kdump_nodes cannot contain $node&quot;
			return 1
		fi
	done

	return 0
}

check_dump_feasibility()
{
	if [ $DEFAULT_DUMP_MODE == &quot;fadump&quot; ]; then
		return 0
	fi

	check_kdump_feasibility
	return $?
}

start_fadump()
{
	echo 1 &gt; $FADUMP_REGISTER_SYS_NODE
	if ! check_current_fadump_status; then
		echo &quot;fadump: failed to register&quot;
		return 1
	fi

	echo &quot;fadump: registered successfully&quot;
	return 0
}

start_dump()
{
	if [ $DEFAULT_DUMP_MODE == &quot;fadump&quot; ]; then
		start_fadump
	else
		load_kdump
	fi

	return $?
}

check_default_config()
{
	local default_option

	default_option=$(awk '$1 ~ /^default$/ {print $2;}' $KDUMP_CONFIG_FILE)
	if [ -z &quot;$default_option&quot; ]; then
		return 0
	else
		case &quot;$default_option&quot; in
		  reboot|halt|poweroff|shell|dump_to_rootfs)
			return 0
		  ;;
		  *)
			echo $&quot;Usage kdump.conf: default {reboot|halt|poweroff|shell|dump_to_rootfs}&quot;
			return 1
		esac
	fi
}

start()
{
	check_dump_feasibility
	if [ $? -ne 0 ]; then
		echo &quot;Starting kdump: [FAILED]&quot;
		return 1
	fi

	check_config
	if [ $? -ne 0 ]; then
		echo &quot;Starting kdump: [FAILED]&quot;
		return 1
	fi

	if sestatus 2&gt;/dev/null | grep -q &quot;SELinux status.*enabled&quot;; then
		selinux_relabel
	fi

	save_raw
	if [ $? -ne 0 ]; then
		echo &quot;Starting kdump: [FAILED]&quot;
		return 1
	fi

	check_current_status
	if [ $? == 0 ]; then
		echo &quot;Kdump already running: [WARNING]&quot;
		return 0
	fi

	if check_ssh_config; then
		if ! check_ssh_target; then
			echo &quot;Starting kdump: [FAILED]&quot;
			return 1
		fi
	fi

	check_rebuild
	if [ $? != 0 ]; then
		echo &quot;Starting kdump: [FAILED]&quot;
		return 1
	fi

	start_dump
	if [ $? != 0 ]; then
		echo &quot;Starting kdump: [FAILED]&quot;
		return 1
	fi

	echo &quot;Starting kdump: [OK]&quot;
}

reload()
{
	check_current_status
	if [ $? -ne 0 ]; then
		echo &quot;Kdump is not running: [WARNING]&quot;
		return 0
	fi

	if [ $DEFAULT_DUMP_MODE == &quot;fadump&quot; ]; then
		reload_fadump
		return $?
	else
		stop_kdump
	fi

	if [ $? -ne 0 ]; then
		echo &quot;Stopping kdump: [FAILED]&quot;
		return 1
	fi

	echo &quot;Stopping kdump: [OK]&quot;

	setup_initrd
	if [ $? -ne 0 ]; then
		echo &quot;Starting kdump: [FAILED]&quot;
		return 1
	fi

	start_dump
	if [ $? -ne 0 ]; then
		echo &quot;Starting kdump: [FAILED]&quot;
		return 1
	fi

	echo &quot;Starting kdump: [OK]&quot;
}

stop_fadump()
{
	echo 0 &gt; $FADUMP_REGISTER_SYS_NODE
	if check_current_fadump_status; then
		echo &quot;fadump: failed to unregister&quot;
		return 1
	fi

	echo &quot;fadump: unregistered successfully&quot;
	return 0
}

stop_kdump()
{
	if is_secure_boot_enforced; then
		$KEXEC -s -p -u
	else
		$KEXEC -p -u
	fi

	if [ $? != 0 ]; then
		echo &quot;kexec: failed to unload kdump kernel&quot;
		return 1
	fi

	echo &quot;kexec: unloaded kdump kernel&quot;
	return 0
}

reload_fadump()
{
	echo 1 &gt; $FADUMP_REGISTER_SYS_NODE
	if [ $? == 0 ]; then
		echo &quot;fadump: re-registered successfully&quot;
		return 0
	else
		# FADump could fail on older kernel where re-register
		# support is not enabled. Try stop/start from userspace
		# to handle such scenario.
		stop_fadump
		if [ $? == 0 ]; then
			start_fadump
			return $?
		fi
	fi

	return 1
}

stop()
{
	if [ $DEFAULT_DUMP_MODE == &quot;fadump&quot; ]; then
		stop_fadump
	else
		stop_kdump
	fi

	if [ $? != 0 ]; then
		echo &quot;Stopping kdump: [FAILED]&quot;
		return 1
	fi

	echo &quot;Stopping kdump: [OK]&quot;
	return 0
}

rebuild() {
	check_config
	if [ $? -ne 0 ]; then
		return 1
	fi

	if check_ssh_config; then
		if ! check_ssh_target; then
			return 1
		fi
	fi

	setup_initrd
	if [ $? -ne 0 ]; then
		return 1
	fi

	echo &quot;Rebuilding $TARGET_INITRD&quot;
	rebuild_initrd
	return $?
}

if [ ! -f &quot;$KDUMP_CONFIG_FILE&quot; ]; then
	echo &quot;Error: No kdump config file found!&quot;  &gt;&amp;2
	exit 1
fi

main ()
{
	# Determine if the dump mode is kdump or fadump
	determine_dump_mode

	case &quot;$1&quot; in
	  start)
		if [ -s /proc/vmcore ]; then
			save_core
			reboot
		else
			start
		fi
		;;
	  stop)
		stop
		;;
	  status)
		EXIT_CODE=0
		check_current_status
		case &quot;$?&quot; in
		  0)
			echo &quot;Kdump is operational&quot;
			EXIT_CODE=0
			;;
		  1)
			echo &quot;Kdump is not operational&quot;
			EXIT_CODE=3
			;;
		esac
		exit $EXIT_CODE
		;;
	  reload)
		reload
		;;
	  restart)
		stop
		start
		;;
	  rebuild)
		rebuild
		;;
	  condrestart)
		;;
	  propagate)
		propagate_ssh_key
		;;
	  showmem)
		show_reserved_mem
		;;
	  *)
		echo $&quot;Usage: $0 {start|stop|status|restart|reload|rebuild|propagate|showmem}&quot;
		exit 1
	esac
}

# Other kdumpctl instances will block in queue, until this one exits
single_instance_lock

# To avoid fd 9 leaking, we invoke a subshell, close fd 9 and call main.
# So that fd isn't leaking when main is invoking a subshell.
(exec 9&lt;&amp;-; main $1)

exit $?
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