/usr/sbin/kdump-config is in kdump-tools 1.5.5-2ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# kdump-config
# Copyright (C) 2007-2009 Hewlett-Packard Development Company, L.P.
# Written by Terry Loftin <terry.loftin@hp.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# kdump-config
# a shell script utility to manage:
# * loading a kdump kernel
# * unloading a kdump kernel
# * saving a vmcore kdump kernel
# * determining the status of kdump
PATH=/bin:/usr/bin:/sbin:/usr/sbin
NAME=${NAME:="kdump-config"}
. /lib/lsb/init-functions
. /lib/init/vars.sh
# Global Setup
KDUMP_DEFAULTS=/etc/default/kdump-tools
[ -r $KDUMP_DEFAULTS ] && . $KDUMP_DEFAULTS
KEXEC=/sbin/kexec
[ -e $KEXEC ] || exit 1;
KVER=`uname -r`
ARCH=`uname -m`
# Set up defaults
KDUMP_SYSCTL=${KDUMP_SYSCTL:="kernel.panic_on_oops=1"}
KDUMP_COREDIR=${KDUMP_COREDIR:=/var/crash}
MAKEDUMP_ARGS=${MAKEDUMP_ARGS:="-c -d 31"}
KDUMP_CMDLINE_APPEND=${KDUMP_CMDLINE_APPEND:="irqpoll maxcpus=1 nousb"}
[ -d $KDUMP_COREDIR ] || mkdir -p $KDUMP_COREDIR ;
IOMEM_ADDR=`grep -i "Crash kernel" /proc/iomem | sed "s/-..*//" | sed "s/^[ 0]*/0x/"`
# Constants
vmcore_file=/proc/vmcore
sys_kexec_crash=/sys/kernel/kexec_crash_loaded
kexec_cmd_file=$KDUMP_COREDIR/kexec_cmd
# Utility Functions
#
function kdump_help()
{
cat <<EOHELP
Usage:
kdump-config {help|test|show|status|load|unload|savecore}"
help - print this page
test - Do a dry-run of the load command. Show the kernels and
parameters that will be used and echo the kexec command.
The kexec command will not be executed.
show - Show kdump status, kexec command, and any current parameters.
status - evaluate /sys/kernel/kexec_crash_loaded and print a message
load - Locate the kdump kernel, debug kernel, and establish links for
makedumpfile. Then load the kdump kernel using kexec
unload - unload the kdump kernel using kexec
savecore - use previously made links to save /proc/vmcore
EOHELP
}
function kdump_show()
{
echo "USE_KDUMP: $USE_KDUMP"
echo "KDUMP_SYSCTL: $KDUMP_SYSCTL"
echo "KDUMP_COREDIR: $KDUMP_COREDIR"
echo "crashkernel addr: $IOMEM_ADDR"
if [ -e $sys_kexec_crash -a `cat $sys_kexec_crash` -eq 1 ] ; then
echo "current state: ready to kdump";
else
echo "current state: Not ready to kdump";
fi
echo
echo "kexec command:"
echo -n " "
if [ -e $kexec_cmd_file ] ; then
cat $kexec_cmd_file ;
else
echo "no kexec command recorded"
fi
}
function kdump_test()
{
echo "USE_KDUMP: $USE_KDUMP"
echo "KDUMP_SYSCTL: $KDUMP_SYSCTL"
echo "KDUMP_COREDIR: $KDUMP_COREDIR"
echo "crashkernel addr: $IOMEM_ADDR"
echo "kdump kernel addr: $KDUMP_ADDR"
echo "kdump kernel:"
echo " $KDUMP_KERNEL"
echo "kdump initrd: "
echo " $KDUMP_INITRD"
echo "kexec command to be used:"
echo " $KEXEC_CMD"
}
# check_kdump_support: Other miscellaneous checks go here:
# 1: if USE_KDUMP is 0, don't set up kdump.
# 2: -e /sys/kernel/kexec_crash loaded indicates that this kernel
# thinks it supports kdump
# 3: the current kernel should have booted with a crashkernel= command
# line parameter.
#
# Returns: none. prints warnings or exit
function check_kdump_support()
{
if [ -z "$USE_KDUMP" -o "$USE_KDUMP" == "0" ] ; then
log_failure_msg "$KDUMP_DEFAULTS: USE_KDUMP is not set or zero"
[ ! $DRY_RUN ] && exit 1;
fi
if [ ! -e $sys_kexec_crash ] ; then
log_failure_msg "kdump is not supported by this kernel"
[ ! $DRY_RUN ] && exit 1;
fi
CRASHKERNEL=`grep -i crashkernel= /proc/cmdline`;
if [ -z "$CRASHKERNEL" ] ; then
log_failure_msg "no crashkernel= parameter in the kernel cmdline"
[ ! $DRY_RUN ] && exit 1;
fi
}
# check_relocatable: check if the given kernel config is relocatable
# Arguments:
# 1: the config file to check
# Returns: 0 if the given kernel config indicates a relocatable kernel.
# 1 otherwise.
function check_relocatable()
{
if [ $ARCH = "ia64" ]; then
# Linux is always relocatable on ia64
return 0
elif grep -q 'CONFIG_RELOCATABLE=y' $1; then
return 0
else
return 1
fi
}
# Find the kexec/kdump kernel and possibly a corresponding initrd.
# A kdump kernel does not need to match the `uname -r` of the booted kernel.
#
# Use the following priorites in determining the kdump kernel:
# 1. An explicit Kdump kernel in the defaults file overrides all
# 2. Use the current running kernel if it is relocatable.
# 3. Give up. Note, a kdump kernel is required.
#
# Returns: 0/1 (success/fail)
# Returns: none. prints warnings or exit
# Sets: KDUMP_KERNEL, KDUMP_INITRD
function locate_kdump_kernel()
{
# 1: User may have specified the KDUMP_KERNEL and KDUMP_INITRD
# explicitly. Test for existance and either use it or fail.
if [ -n "$KDUMP_KERNEL" ] ; then
if [ ! -e "$KDUMP_KERNEL" ] ; then
log_failure_msg "$KDUMP_DEFAULTS: KDUMP_KERNEL does not exist: $KDUMP_KERNEL"
[ ! $DRY_RUN ] && exit 1;
elif [ -n "$KDUMP_INITRD" -a ! -e "$KDUMP_INITRD" ] ; then
log_failure_msg "$KDUMP_DEFAULTS: KDUMP_INITRD does not exist: $KDUMP_INITRD"
[ ! $DRY_RUN ] && exit 1;
fi
return 0;
fi
# 2: The currently running kernel may be relocatable. If so, then
# use the currently running kernel as the crash kernel.
if check_relocatable /boot/config-$KVER; then
KDUMP_KERNEL=/boot/vmlinuz-$KVER
if [ -f /boot/initrd.img-$KVER ]; then
KDUMP_INITRD=/boot/initrd.img-$KVER
else
KDUMP_INITRD=
fi
KDUMP_ADDR="relocatable"
return 0;
fi
# If the kdump kernel is not relocatable, we need to make sure it was
# built to start at the crashkernel= address. IOMEM_ADDR is already
# set...
if [ -z "$KDUMP_CONFIG" ] ; then return 0 ; fi
if check_relocatable $KDUMP_CONFIG; then
KDUMP_ADDR="relocatable"
else
KDUMP_ADDR=`grep CONFIG_PHYSICAL_START $KDUMP_CONFIG | sed "s/CONFIG_PHYSICAL_START=//"`
# compare the two
if [ $KDUMP_ADDR != $IOMEM_ADDR ] ; then
log_failure_msg "kdump kernel relocation address does not match crashkernel parameter"
[ ! $DRY_RUN ] && exit 1;
return 1;
fi
fi
return 0;
}
#
# Load the already determined kdump kernel and kdump initrd using kexec
# 1: A KDUMP_CMDLINE in the defaults file overrides all.
# 2: Use /proc/cmdline
# a. strip out the crashkernel= parameter.
# b. strip out the abm= parameter.
# c. append KDUMP_CMDLINE_APPEND from defaults file
# Sets: KEXEC_CMD
# Returns: none. prints warnings or exit
function kdump_load()
{
# assemble the kexec command used to load the kdump kernel
KEXEC_CMD="$KEXEC -p"
# Different kernel types allow/require different options:
# The only special case here is that x86, x86_64 elf style
# binaries require the --args-linux argument.
if [ $ARCH != "ia64" ] ; then
ELF_TST=`file $KDUMP_KERNEL | grep ELF`
if [ -n "$ELF_TST" ] ; then
KEXEC_CMD="$KEXEC_CMD --args-linux"
fi
fi
# KDUMP_KEXEC_ARGS, if non-empty, comes from the defaults file.
if [ -n "$KDUMP_KEXEC_ARGS" ] ; then
KEXEC_CMD="$KEXEC_CMD $KDUMP_KEXEC_ARGS"
fi
# Assemble the --commmand-line:
if [ -z "$KDUMP_CMDLINE" ] ; then
KDUMP_CMDLINE=`cat /proc/cmdline | \
sed -r -e 's/(^| )crashkernel=[^ ]*//g' \
-e 's/(^| )abm=[^ ]*//g'`
fi
KDUMP_CMDLINE="$KDUMP_CMDLINE $KDUMP_CMDLINE_APPEND"
KEXEC_CMD="$KEXEC_CMD --command-line=\"$KDUMP_CMDLINE\""
# Assemble the --initrd:
if [ -e "$KDUMP_INITRD" ] ; then
KEXEC_CMD="$KEXEC_CMD --initrd=$KDUMP_INITRD"
fi
# Finally, add the kernel:
KEXEC_CMD="$KEXEC_CMD $KDUMP_KERNEL"
if [ $DRY_RUN ] ; then return 0; fi
eval $KEXEC_CMD
if [ $? == 0 ]; then
log_success_msg "loaded kdump kernel"
logger -t $NAME "$KEXEC_CMD"
logger -t $NAME "loaded kdump kernel"
echo "$KEXEC_CMD" >$kexec_cmd_file
else
log_failure_msg "failed to load kdump kernel"
logger -t $NAME "failed to load kdump kernel"
[ ! $DRY_RUN ] && exit 1;
fi
# Last step: make sure panic_on_oops is enabled
if [ -x /sbin/sysctl -a "$KDUMP_SYSCTL" != " " ] ; then
sysctl -w $KDUMP_SYSCTL >/dev/null
fi
}
# Returns: none. prints warnings or exit
function kdump_unload()
{
$KEXEC -p -u
if [ $? == 0 ]; then
log_success_msg "unloaded kdump kernel"
logger -t $NAME "unloaded kdump kernel"
else
log_failure_msg "failed to unload kdump kernel"
logger -t $NAME "failed to unload kdump kernel"
[ ! $DRY_RUN ] && exit 1;
fi
}
# Saving the vmcore:
# Our priorities are:
# 1. If the makedumpfile config link is valid, use that
# 2. else if the vmlinux link is valid, use that
# 3. else fallback to using: makedumpfile -d 1 -c
# 4. else use cp
#
# TODO: implement different transport options other than
# store to local disk
#
# Returns: 0/1 (success/fail)
# Sets: KDUMP_STAMPDIR, KDUMP_COREFILE
function kdump_save_core()
{
KDUMP_STAMP=`date +"%Y%m%d%H%M"`
KDUMP_STAMPDIR="$KDUMP_COREDIR/$KDUMP_STAMP"
KDUMP_CORETEMP="$KDUMP_STAMPDIR/dump-incomplete"
KDUMP_COREFILE="$KDUMP_STAMPDIR/dump.$KDUMP_STAMP"
KDUMP_DMESGFILE="$KDUMP_STAMPDIR/dmesg.$KDUMP_STAMP"
mkdir -p $KDUMP_STAMPDIR
log_action_msg "running makedumpfile $MAKEDUMP_ARGS $vmcore_file $KDUMP_CORETEMP"
makedumpfile $MAKEDUMP_ARGS $vmcore_file $KDUMP_CORETEMP
if [ $? -ne 0 ] ; then
log_failure_msg "$NAME: makedumpfile failed, falling back to 'cp'"
logger -t $NAME "makedumpfile failed, falling back to 'cp'"
KDUMP_CORETEMP="$KDUMP_STAMPDIR/vmcore-incomplete"
KDUMP_COREFILE="$KDUMP_STAMPDIR/vmcore.$KDUMP_STAMP"
cp $vmcore_file $KDUMP_CORETEMP
fi
# did we succeed?
if [ $? == 0 ]; then
mv $KDUMP_CORETEMP $KDUMP_COREFILE
log_success_msg "$NAME: saved vmcore in $KDUMP_STAMPDIR"
logger -t $NAME "saved vmcore in $KDUMP_STAMPDIR"
else
log_failure_msg "$NAME: failed to save vmcore in $KDUMP_STAMPDIR"
logger -t $NAME "failed to save vmcore in $KDUMP_STAMPDIR"
fi
log_action_msg "running makedumpfile --dump-dmesg $vmcore_file $KDUMP_DMESGFILE"
makedumpfile --dump-dmesg $vmcore_file $KDUMP_DMESGFILE
ERROR=$?
if [ $ERROR -ne 0 ] ; then
log_failure_msg "$NAME: makedumpfile --dump-dmesg failed. dmesg content will be unavailable"
logger -t $NAME "makedumpfile --dump-dmesg failed. dmesg content will be unavailable"
fi
# did we succeed?
if [ $ERROR == 0 ]; then
log_success_msg "$NAME: saved dmesg content in $KDUMP_STAMPDIR"
logger -t $NAME "saved dmesg content in $KDUMP_STAMPDIR"
return 0;
else
log_failure_msg "$NAME: failed to save dmesg content in $KDUMP_STAMPDIR"
logger -t $NAME "failed to save dmesg content in $KDUMP_STAMPDIR"
return 1;
fi
}
case "$1" in
test)
DRY_RUN="true"
check_kdump_support;
locate_kdump_kernel;
kdump_load;
kdump_test
;;
show)
DRY_RUN="true"
check_kdump_support;
kdump_show
;;
load)
check_kdump_support;
locate_kdump_kernel;
kdump_load;
;;
unload)
kdump_unload;
;;
status)
check_kdump_support;
if [ `cat $sys_kexec_crash` -eq 1 ] ; then
echo "current state : ready to kdump";
else
echo "current state : Not ready to kdump";
fi
exit 0;
;;
savecore)
kdump_save_core
exit $?
;;
help|-h*|--h*)
kdump_help
;;
*)
echo "Usage: $0 {help|test|show|status|load|unload|savecore}"
exit 1
;;
esac
exit 0
|