kexec-tools/kdump-lib.sh

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#!/bin/sh
#
# Kdump common variables and functions
#
DEFAULT_PATH="/var/crash/"
FENCE_KDUMP_CONFIG_FILE="/etc/sysconfig/fence_kdump"
FENCE_KDUMP_SEND="/usr/libexec/fence_kdump_send"
FADUMP_ENABLED_SYS_NODE="/sys/kernel/fadump_enabled"
is_fadump_capable()
{
# Check if firmware-assisted dump is enabled
# if no, fallback to kdump check
if [ -f $FADUMP_ENABLED_SYS_NODE ]; then
rc=`cat $FADUMP_ENABLED_SYS_NODE`
[ $rc -eq 1 ] && return 0
fi
return 1
}
2021-07-12 08:07:05 +00:00
is_squash_available() {
for kmodule in squashfs overlay loop; do
if [ -z "$KDUMP_KERNELVER" ]; then
modprobe --dry-run $kmodule &>/dev/null || return 1
else
modprobe -S $KDUMP_KERNELVER --dry-run $kmodule &>/dev/null || return 1
fi
done
}
perror_exit() {
derror "$@"
exit 1
}
is_fs_type_nfs()
{
[ "$1" = "nfs" ] || [ "$1" = "nfs4" ]
}
is_ssh_dump_target()
{
grep -q "^ssh[[:blank:]].*@" /etc/kdump.conf
}
is_nfs_dump_target()
{
if grep -q "^nfs" /etc/kdump.conf; then
return 0;
fi
if is_fs_type_nfs $(get_dracut_args_fstype "$(grep "^dracut_args .*\-\-mount" /etc/kdump.conf)"); then
return 0
fi
local _save_path=$(get_save_path)
local _target=$(get_target_from_path $_save_path)
local _fstype=$(get_fs_type_from_target $_target)
if is_fs_type_nfs $_fstype; then
return 0
fi
return 1
}
is_raw_dump_target()
{
grep -q "^raw" /etc/kdump.conf
}
is_fs_dump_target()
{
egrep -q "^ext[234]|^xfs|^btrfs|^minix" /etc/kdump.conf
}
strip_comments()
{
echo $@ | sed -e 's/\(.*\)#.*/\1/'
}
# Read from kdump config file stripping all comments
read_strip_comments()
{
# strip heading spaces, and print any content starting with
# neither space or #, and strip everything after #
sed -n -e "s/^\s*\([^# \t][^#]\+\).*/\1/gp" $1
}
# Check if fence kdump is configured in Pacemaker cluster
is_pcs_fence_kdump()
{
# no pcs or fence_kdump_send executables installed?
type -P pcs > /dev/null || return 1
[ -x $FENCE_KDUMP_SEND ] || return 1
# fence kdump not configured?
(pcs cluster cib | grep 'type="fence_kdump"') &> /dev/null || return 1
}
# Check if fence_kdump is configured using kdump options
is_generic_fence_kdump()
{
[ -x $FENCE_KDUMP_SEND ] || return 1
grep -q "^fence_kdump_nodes" /etc/kdump.conf
}
to_dev_name() {
local dev="${1//\"/}"
case "$dev" in
UUID=*)
dev=`blkid -U "${dev#UUID=}"`
;;
LABEL=*)
dev=`blkid -L "${dev#LABEL=}"`
;;
esac
echo $dev
}
is_user_configured_dump_target()
{
grep -E -q "^ext[234]|^xfs|^btrfs|^minix|^raw|^nfs|^ssh" /etc/kdump.conf || is_mount_in_dracut_args;
}
get_user_configured_dump_disk()
{
local _target
_target=$(egrep "^ext[234]|^xfs|^btrfs|^minix|^raw" /etc/kdump.conf 2>/dev/null |awk '{print $2}')
[ -n "$_target" ] && echo $_target && return
_target=$(get_dracut_args_target "$(grep "^dracut_args .*\-\-mount" /etc/kdump.conf)")
[ -b "$_target" ] && echo $_target
}
get_root_fs_device()
{
findmnt -k -f -n -o SOURCE /
}
get_save_path()
{
local _save_path=$(awk '$1 == "path" {print $2}' /etc/kdump.conf)
[ -z "$_save_path" ] && _save_path=$DEFAULT_PATH
# strip the duplicated "/"
echo $_save_path | tr -s /
}
get_block_dump_target()
{
local _target _path
if is_ssh_dump_target || is_nfs_dump_target; then
return
fi
_target=$(get_user_configured_dump_disk)
[ -n "$_target" ] && echo $(to_dev_name $_target) && return
# Get block device name from local save path
_path=$(get_save_path)
_target=$(get_target_from_path $_path)
[ -b "$_target" ] && echo $(to_dev_name $_target)
}
is_dump_to_rootfs()
{
grep -E "^(failure_action|default)[[:space:]]dump_to_rootfs" /etc/kdump.conf >/dev/null
}
get_failure_action_target()
{
local _target
if is_dump_to_rootfs; then
# Get rootfs device name
_target=$(get_root_fs_device)
[ -b "$_target" ] && echo $(to_dev_name $_target) && return
# Then, must be nfs root
echo "nfs"
fi
}
# Get kdump targets(including root in case of dump_to_rootfs).
get_kdump_targets()
{
local _target _root
local kdump_targets
_target=$(get_block_dump_target)
if [ -n "$_target" ]; then
kdump_targets=$_target
elif is_ssh_dump_target; then
kdump_targets="ssh"
else
kdump_targets="nfs"
fi
# Add the root device if dump_to_rootfs is specified.
_root=$(get_failure_action_target)
if [ -n "$_root" -a "$kdump_targets" != "$_root" ]; then
kdump_targets="$kdump_targets $_root"
fi
echo "$kdump_targets"
}
# Return the bind mount source path, return the path itself if it's not bind mounted
# Eg. if /path/to/src is bind mounted to /mnt/bind, then:
# /mnt/bind -> /path/to/src, /mnt/bind/dump -> /path/to/src/dump
#
# findmnt uses the option "-v, --nofsroot" to exclusive the [/dir]
# in the SOURCE column for bind-mounts, then if $_src equals to
# $_src_nofsroot, the mountpoint is not bind mounted directory.
#
# Below is just an example for mount info
# /dev/mapper/atomicos-root[/ostree/deploy/rhel-atomic-host/var], if the
# directory is bind mounted. The former part represents the device path, rest
# part is the bind mounted directory which quotes by bracket "[]".
get_bind_mount_source()
{
local _mnt=$(df $1 | tail -1 | awk '{print $NF}')
local _path=${1#$_mnt}
local _src=$(get_mount_info SOURCE target $_mnt -f)
local _opt=$(get_mount_info OPTIONS target $_mnt -f)
local _fstype=$(get_mount_info FSTYPE target $_mnt -f)
# bind mount in fstab
if [[ -d "$_src" ]] && [[ "$_fstype" = none ]] && (echo "$_opt" | grep -q "\bbind\b"); then
echo $_src$_path && return
fi
# direct mount
local _src_nofsroot=$(get_mount_info SOURCE target $_mnt -v -f)
if [[ $_src_nofsroot = $_src ]]; then
echo $_mnt$_path && return
fi
local _fsroot=${_src#$_src_nofsroot[}
_fsroot=${_fsroot%]}
_mnt=$(get_mount_info TARGET source $_src_nofsroot -f)
# for btrfs, _fsroot will also contain the subvol value as well, strip it
if [[ "$_fstype" = btrfs ]]; then
local _subvol
_subvol=${_opt#*subvol=}
_subvol=${_subvol%,*}
_fsroot=${_fsroot#$_subvol}
fi
echo $_mnt$_fsroot$_path
}
# Return the current underlaying device of a path, ignore bind mounts
get_target_from_path()
{
local _target
_target=$(df $1 2>/dev/null | tail -1 | awk '{print $1}')
[[ "$_target" == "/dev/root" ]] && [[ ! -e /dev/root ]] && _target=$(get_root_fs_device)
echo $_target
}
is_mounted()
{
findmnt -k -n $1 &>/dev/null
}
get_mount_info()
{
local _info_type=$1 _src_type=$2 _src=$3; shift 3
local _info=$(findmnt -k -n -r -o $_info_type --$_src_type $_src $@)
[ -z "$_info" ] && [ -e "/etc/fstab" ] && _info=$(findmnt -s -n -r -o $_info_type --$_src_type $_src $@)
echo $_info
}
get_fs_type_from_target()
{
get_mount_info FSTYPE source $1 -f
}
get_mntopt_from_target()
{
get_mount_info OPTIONS source $1 -f
}
# Find the general mount point of a dump target, not the bind mount point
get_mntpoint_from_target()
{
# Expcilitly specify --source to findmnt could ensure non-bind mount is returned
get_mount_info TARGET source $1 -f
}
# Get the path where the target will be mounted in kdump kernel
# $1: kdump target device
get_kdump_mntpoint_from_target()
{
local _mntpoint=$(get_mntpoint_from_target $1)
# mount under /sysroot if dump to root disk or mount under
# mount under /kdumproot if dump target is not mounted in first kernel
# mount under /kdumproot/$_mntpoint in other cases in 2nd kernel.
# systemd will be in charge to umount it.
if [ -z "$_mntpoint" ];then
_mntpoint="/kdumproot"
else
if [ "$_mntpoint" = "/" ];then
_mntpoint="/sysroot"
else
_mntpoint="/kdumproot/$_mntpoint"
fi
fi
# strip duplicated "/"
echo $_mntpoint | tr -s "/"
}
# get_option_value <option_name>
# retrieves value of option defined in kdump.conf
get_option_value() {
strip_comments `grep "^$1[[:space:]]\+" /etc/kdump.conf | tail -1 | cut -d\ -f2-`
}
kdump_get_persistent_dev() {
local dev="${1//\"/}"
case "$dev" in
UUID=*)
dev=`blkid -U "${dev#UUID=}"`
;;
LABEL=*)
dev=`blkid -L "${dev#LABEL=}"`
;;
esac
echo $(get_persistent_dev "$dev")
}
is_atomic()
{
grep -q "ostree" /proc/cmdline
}
is_ipv6_address()
{
echo $1 | grep -q ":"
}
# get ip address or hostname from nfs/ssh config value
get_remote_host()
{
local _config_val=$1
# ipv6 address in kdump.conf is around with "[]",
# factor out the ipv6 address
_config_val=${_config_val#*@}
_config_val=${_config_val%:/*}
_config_val=${_config_val#[}
_config_val=${_config_val%]}
echo $_config_val
}
is_hostname()
{
local _hostname=`echo $1 | grep ":"`
if [ -n "$_hostname" ]; then
return 1
fi
echo $1 | grep -q "[a-zA-Z]"
}
# Copied from "/etc/sysconfig/network-scripts/network-functions"
get_hwaddr()
{
if [ -f "/sys/class/net/${1}/address" ]; then
awk '{ print toupper($0) }' < /sys/class/net/${1}/address
elif [ -d "/sys/class/net/${1}" ]; then
LC_ALL= LANG= ip -o link show ${1} 2>/dev/null | \
awk '{ print toupper(gensub(/.*link\/[^ ]* ([[:alnum:]:]*).*/,
"\\1", 1)); }'
fi
}
# Get value by a field using "nmcli -g"
#
# "nmcli --get-values" allows us to retrive value(s) by field, for example,
# nmcli --get-values <field> connection show /org/freedesktop/NetworkManager/ActiveConnection/1
# returns the following value for the corresponding field respectively,
# Field Value
# IP4.DNS "10.19.42.41 | 10.11.5.19 | 10.5.30.160"
# 802-3-ethernet.s390-subchannels ""
# bond.options "mode=balance-rr"
get_nmcli_value_by_field()
{
local _nm_show_cmd=$1
local _field=$2
local val=$(LANG=C nmcli --get-values $_field $_nm_show_cmd)
echo -n "$val"
}
# Get nmcli connection apath (a D-Bus active connection path ) by ifname
#
# apath is used for nmcli connection operations, e.g.
# $ nmcli connection show $apath
get_nmcli_connection_apath_by_ifname()
{
local _ifname=$1
local _nm_show_cmd="device show $_ifname"
local _apath=$(get_nmcli_value_by_field "$_nm_show_cmd" "GENERAL.CON-PATH")
echo -n "$_apath"
}
# Get nmcli connection show cmd by ifname
#
# "$_apath" is supposed to not contain any chracter that
# need to be escapded, e.g. space. Otherwise get_nmcli_value_by_field
# would fail.
get_nmcli_connection_show_cmd_by_ifname()
{
local _ifname="$1"
local _apath=$(get_nmcli_connection_apath_by_ifname "$_ifname")
local _nm_show_cmd="connection show $_apath"
echo -n "$_nm_show_cmd"
}
get_ifcfg_by_device()
{
grep -E -i -l "^[[:space:]]*DEVICE=\"*${1}\"*[[:space:]]*$" \
/etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
}
get_ifcfg_by_hwaddr()
{
grep -E -i -l "^[[:space:]]*HWADDR=\"*${1}\"*[[:space:]]*$" \
/etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
}
get_ifcfg_by_uuid()
{
grep -E -i -l "^[[:space:]]*UUID=\"*${1}\"*[[:space:]]*$" \
/etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
}
get_ifcfg_by_name()
{
grep -E -i -l "^[[:space:]]*NAME=\"*${1}\"*[[:space:]]*$" \
/etc/sysconfig/network-scripts/ifcfg-* 2>/dev/null | head -1
}
is_nm_running()
{
[ "$(LANG=C nmcli -t --fields running general status 2>/dev/null)" = "running" ]
}
is_nm_handling()
{
LANG=C nmcli -t --fields device,state dev status 2>/dev/null \
| grep -q "^\(${1}:connected\)\|\(${1}:connecting.*\)$"
}
# $1: netdev name
get_ifcfg_nmcli()
{
local nm_uuid nm_name
local ifcfg_file
# Get the active nmcli config name of $1
if is_nm_running && is_nm_handling "${1}" ; then
# The configuration "uuid" and "name" generated by nm is wrote to
# the ifcfg file as "UUID=<nm_uuid>" and "NAME=<nm_name>".
nm_uuid=$(LANG=C nmcli -t --fields uuid,device c show --active 2>/dev/null \
| grep "${1}" | head -1 | cut -d':' -f1)
nm_name=$(LANG=C nmcli -t --fields name,device c show --active 2>/dev/null \
| grep "${1}" | head -1 | cut -d':' -f1)
ifcfg_file=$(get_ifcfg_by_uuid "${nm_uuid}")
[ -z "${ifcfg_file}" ] && ifcfg_file=$(get_ifcfg_by_name "${nm_name}")
fi
echo -n "${ifcfg_file}"
}
# $1: netdev name
get_ifcfg_legacy()
{
local ifcfg_file
ifcfg_file="/etc/sysconfig/network-scripts/ifcfg-${1}"
[ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return
ifcfg_file=$(get_ifcfg_by_name "${1}")
[ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return
local hwaddr=$(get_hwaddr "${1}")
if [ -n "$hwaddr" ]; then
ifcfg_file=$(get_ifcfg_by_hwaddr "${hwaddr}")
[ -f "${ifcfg_file}" ] && echo -n "${ifcfg_file}" && return
fi
ifcfg_file=$(get_ifcfg_by_device "${1}")
echo -n "${ifcfg_file}"
}
# $1: netdev name
# Return the ifcfg file whole name(including the path) of $1 if any.
get_ifcfg_filename() {
local ifcfg_file
ifcfg_file=$(get_ifcfg_nmcli "${1}")
if [ -z "${ifcfg_file}" ]; then
ifcfg_file=$(get_ifcfg_legacy "${1}")
fi
echo -n "${ifcfg_file}"
}
# returns 0 when omission of a module is desired in dracut_args
# returns 1 otherwise
is_dracut_mod_omitted() {
local dracut_args dracut_mod=$1
set -- $(grep "^dracut_args" /etc/kdump.conf)
while [ $# -gt 0 ]; do
case $1 in
-o|--omit)
[[ " ${2//[^[:alnum:]]/ } " == *" $dracut_mod "* ]] && return 0
esac
shift
done
return 1
}
is_wdt_active() {
local active
[ -d /sys/class/watchdog ] || return 1
for dir in /sys/class/watchdog/*; do
[ -f "$dir/state" ] || continue
active=$(< "$dir/state")
[ "$active" = "active" ] && return 0
done
return 1
}
# If "dracut_args" contains "--mount" information, use it
# directly without any check(users are expected to ensure
# its correctness).
is_mount_in_dracut_args()
{
grep -q "^dracut_args .*\-\-mount" /etc/kdump.conf
}
# If $1 contains dracut_args "--mount", return <filesystem type>
get_dracut_args_fstype()
{
echo $1 | grep "\-\-mount" | sed "s/.*--mount .\(.*\)/\1/" | cut -d' ' -f3
}
# If $1 contains dracut_args "--mount", return <device>
get_dracut_args_target()
{
echo $1 | grep "\-\-mount" | sed "s/.*--mount .\(.*\)/\1/" | cut -d' ' -f1
}
check_crash_mem_reserved()
{
local mem_reserved
mem_reserved=$(cat /sys/kernel/kexec_crash_size)
if [ $mem_reserved -eq 0 ]; then
derror "No memory reserved for crash kernel"
return 1
fi
return 0
}
check_kdump_feasibility()
{
if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
derror "Kdump is not supported on this kernel"
return 1
fi
check_crash_mem_reserved
return $?
}
check_current_kdump_status()
{
if [ ! -f /sys/kernel/kexec_crash_loaded ];then
derror "Perhaps CONFIG_CRASH_DUMP is not enabled in kernel"
return 1
fi
rc=`cat /sys/kernel/kexec_crash_loaded`
if [ $rc == 1 ]; then
return 0
else
return 1
fi
}
# remove_cmdline_param <kernel cmdline> <param1> [<param2>] ... [<paramN>]
# Remove a list of kernel parameters from a given kernel cmdline and print the result.
# For each "arg" in the removing params list, "arg" and "arg=xxx" will be removed if exists.
remove_cmdline_param()
{
local cmdline=$1
shift
for arg in $@; do
cmdline=`echo $cmdline | \
sed -e "s/\b$arg=[^ ]*//g" \
-e "s/^$arg\b//g" \
-e "s/[[:space:]]$arg\b//g" \
-e "s/\s\+/ /g"`
done
echo $cmdline
}
#
# This function returns the "apicid" of the boot
# cpu (cpu 0) if present.
#
get_bootcpu_apicid()
{
awk ' \
BEGIN { CPU = "-1"; } \
$1=="processor" && $2==":" { CPU = $NF; } \
CPU=="0" && /^apicid/ { print $NF; } \
' \
/proc/cpuinfo
}
#
# append_cmdline <kernel cmdline> <parameter name> <parameter value>
# This function appends argument "$2=$3" to string ($1) if not already present.
#
append_cmdline()
{
local cmdline=$1
local newstr=${cmdline/$2/""}
# unchanged str implies argument wasn't there
if [ "$cmdline" == "$newstr" ]; then
cmdline="${cmdline} ${2}=${3}"
fi
echo $cmdline
}
# 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 ($1, r, "-"); \
print (strtonum("0x" r[2]) > strtonum("0xffffffff")); }'`
}
# Check if secure boot is being enforced.
#
# Per Peter Jones, we need check efivar SecureBoot-$(the UUID) and
# SetupMode-$(the UUID), they are both 5 bytes binary data. The first four
# bytes are the attributes associated with the variable and can safely be
# ignored, the last bytes are one-byte true-or-false variables. If SecureBoot
# is 1 and SetupMode is 0, then secure boot is being enforced.
#
# Assume efivars is mounted at /sys/firmware/efi/efivars.
is_secure_boot_enforced()
{
local secure_boot_file setup_mode_file
local secure_boot_byte setup_mode_byte
# On powerpc, os-secureboot-enforcing DT property indicates whether secureboot
# is enforced. Return success, if it is found.
if [ -f /proc/device-tree/ibm,secureboot/os-secureboot-enforcing ]; then
return 0
fi
# Detect secure boot on x86 and arm64
secure_boot_file=$(find /sys/firmware/efi/efivars -name SecureBoot-* 2>/dev/null)
setup_mode_file=$(find /sys/firmware/efi/efivars -name SetupMode-* 2>/dev/null)
if [ -f "$secure_boot_file" ] && [ -f "$setup_mode_file" ]; then
secure_boot_byte=$(hexdump -v -e '/1 "%d\ "' $secure_boot_file|cut -d' ' -f 5)
setup_mode_byte=$(hexdump -v -e '/1 "%d\ "' $setup_mode_file|cut -d' ' -f 5)
if [ "$secure_boot_byte" = "1" ] && [ "$setup_mode_byte" = "0" ]; then
return 0
fi
fi
# Detect secure boot on s390x
if [[ -e "/sys/firmware/ipl/secure" && "$(cat /sys/firmware/ipl/secure)" == "1" ]]; then
return 0
fi
return 1
}
#
# prepare_kexec_args <kexec args>
# This function prepares kexec argument.
#
prepare_kexec_args()
{
local kexec_args=$1
local found_elf_args
ARCH=`uname -m`
if [ "$ARCH" == "i686" -o "$ARCH" == "i386" ]
then
need_64bit_headers
if [ $? == 1 ]
then
found_elf_args=`echo $kexec_args | grep elf32-core-headers`
if [ -n "$found_elf_args" ]
then
dwarn "Warning: elf32-core-headers overrides correct elf64 setting"
else
kexec_args="$kexec_args --elf64-core-headers"
fi
else
found_elf_args=`echo $kexec_args | grep elf64-core-headers`
if [ -z "$found_elf_args" ]
then
kexec_args="$kexec_args --elf32-core-headers"
fi
fi
fi
echo $kexec_args
}
#
# Detect initrd and kernel location, results are stored in global enviromental variables:
# KDUMP_BOOTDIR, KDUMP_KERNELVER, KDUMP_KERNEL, DEFAULT_INITRD, and KDUMP_INITRD
#
# Expectes KDUMP_BOOTDIR, KDUMP_IMG, KDUMP_IMG_EXT, KDUMP_KERNELVER to be loaded from config already
# and will prefer already set values so user can specify custom kernel/initramfs location
#
prepare_kdump_bootinfo()
{
local boot_imglist boot_dirlist boot_initrdlist curr_kver="$(uname -r)"
local machine_id
if [ -z "$KDUMP_KERNELVER" ]; then
KDUMP_KERNELVER="$(uname -r)"
fi
read machine_id < /etc/machine-id
boot_dirlist=${KDUMP_BOOTDIR:-"/boot /boot/efi /efi /"}
boot_imglist="$KDUMP_IMG-$KDUMP_KERNELVER$KDUMP_IMG_EXT $machine_id/$KDUMP_KERNELVER/$KDUMP_IMG"
# Use BOOT_IMAGE as reference if possible, strip the GRUB root device prefix in (hd0,gpt1) format
local boot_img="$(cat /proc/cmdline | sed "s/^BOOT_IMAGE=\((\S*)\)\?\(\S*\) .*/\2/")"
if [ -n "$boot_img" ]; then
boot_imglist="$boot_img $boot_imglist"
fi
for dir in $boot_dirlist; do
for img in $boot_imglist; do
if [ -f "$dir/$img" ]; then
KDUMP_KERNEL=$(echo $dir/$img | tr -s '/')
break 2
fi
done
done
if ! [ -e "$KDUMP_KERNEL" ]; then
derror "Failed to detect kdump kernel location"
return 1
fi
# Set KDUMP_BOOTDIR to where kernel image is stored
KDUMP_BOOTDIR=$(dirname $KDUMP_KERNEL)
# Default initrd should just stay aside of kernel image, try to find it in KDUMP_BOOTDIR
boot_initrdlist="initramfs-$KDUMP_KERNELVER.img initrd"
for initrd in $boot_initrdlist; do
if [ -f "$KDUMP_BOOTDIR/$initrd" ]; then
defaut_initrd_base="$initrd"
DEFAULT_INITRD="$KDUMP_BOOTDIR/$defaut_initrd_base"
break
fi
done
# Create kdump initrd basename from default initrd basename
# initramfs-5.7.9-200.fc32.x86_64.img => initramfs-5.7.9-200.fc32.x86_64kdump.img
# initrd => initrdkdump
if [[ -z "$defaut_initrd_base" ]]; then
kdump_initrd_base=initramfs-${KDUMP_KERNELVER}kdump.img
elif [[ $defaut_initrd_base == *.* ]]; then
kdump_initrd_base=${defaut_initrd_base%.*}kdump.${DEFAULT_INITRD##*.}
else
kdump_initrd_base=${defaut_initrd_base}kdump
fi
# Place kdump initrd in `/var/lib/kdump` if `KDUMP_BOOTDIR` not writable
if [[ ! -w "$KDUMP_BOOTDIR" ]];then
var_target_initrd_dir="/var/lib/kdump"
mkdir -p "$var_target_initrd_dir"
KDUMP_INITRD="$var_target_initrd_dir/$kdump_initrd_base"
else
KDUMP_INITRD="$KDUMP_BOOTDIR/$kdump_initrd_base"
fi
}
get_watchdog_drvs()
{
local _wdtdrvs _drv _dir
for _dir in /sys/class/watchdog/*; do
# device/modalias will return driver of this device
[[ -f "$_dir/device/modalias" ]] || continue
_drv=$(< "$_dir/device/modalias")
_drv=$(modprobe --set-version "$KDUMP_KERNELVER" -R $_drv 2>/dev/null)
for i in $_drv; do
if ! [[ " $_wdtdrvs " == *" $i "* ]]; then
_wdtdrvs="$_wdtdrvs $i"
fi
done
done
echo $_wdtdrvs
}
#
# prepare_cmdline <commandline> <commandline remove> <commandline append>
# 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 "$1" ]; then
cmdline=$(cat /proc/cmdline)
else
cmdline="$1"
fi
# These params should always be removed
cmdline=$(remove_cmdline_param "$cmdline" crashkernel panic_on_warn)
# These params can be removed configurably
cmdline=$(remove_cmdline_param "$cmdline" "$2")
# Always remove "root=X", as we now explicitly generate all kinds
# of dump target mount information including root fs.
#
# We do this before KDUMP_COMMANDLINE_APPEND, if one really cares
# about it(e.g. for debug purpose), then can pass "root=X" using
# KDUMP_COMMANDLINE_APPEND.
cmdline=$(remove_cmdline_param "$cmdline" root)
# With the help of "--hostonly-cmdline", we can avoid some interitage.
cmdline=$(remove_cmdline_param "$cmdline" rd.lvm.lv rd.luks.uuid rd.dm.uuid rd.md.uuid fcoe)
# Remove netroot, rd.iscsi.initiator and iscsi_initiator since
# we get duplicate entries for the same in case iscsi code adds
# it as well.
cmdline=$(remove_cmdline_param "$cmdline" netroot rd.iscsi.initiator iscsi_initiator)
cmdline="${cmdline} $3"
id=$(get_bootcpu_apicid)
if [ ! -z ${id} ] ; then
cmdline=$(append_cmdline "${cmdline}" disable_cpu_apicid ${id})
fi
# If any watchdog is used, set it's pretimeout to 0. pretimeout let
# watchdog panic the kernel first, and reset the system after the
# panic. If the system is already in kdump, panic is not helpful
# and only increase the chance of watchdog failure.
for i in $(get_watchdog_drvs); do
cmdline+=" $i.pretimeout=0"
if [[ $i == hpwdt ]]; then
# hpwdt have a special parameter kdumptimeout, is's only suppose
# to be set to non-zero in first kernel. In kdump, non-zero
# value could prevent the watchdog from resetting the system.
cmdline+=" $i.kdumptimeout=0"
fi
done
echo ${cmdline}
}
#get system memory size in the unit of GB
get_system_size()
{
result=$(cat /proc/iomem | grep "System RAM" | awk -F ":" '{ print $1 }' | tr [:lower:] [:upper:] | paste -sd+)
result="+$result"
# replace '-' with '+0x' and '+' with '-0x'
sum=$( echo $result | sed -e 's/-/K0x/g' | sed -e 's/+/-0x/g' | sed -e 's/K/+/g' )
size=$(printf "%d\n" $(($sum)))
let size=$size/1024/1024/1024
echo $size
}
get_recommend_size()
{
local mem_size=$1
local _ck_cmdline=$2
local OLDIFS="$IFS"
last_sz=""
last_unit=""
start=${_ck_cmdline: :1}
if [ $mem_size -lt $start ]; then
echo "0M"
return
fi
IFS=','
for i in $_ck_cmdline; do
end=$(echo $i | awk -F "-" '{ print $2 }' | awk -F ":" '{ print $1 }')
recommend=$(echo $i | awk -F "-" '{ print $2 }' | awk -F ":" '{ print $2 }')
size=${end: : -1}
unit=${end: -1}
if [ $unit == 'T' ]; then
let size=$size*1024
fi
if [ $mem_size -lt $size ]; then
echo $recommend
IFS="$OLDIFS"
return
fi
done
IFS="$OLDIFS"
}
# return recommended size based on current system RAM size
kdump_get_arch_recommend_size()
{
if ! [[ -r "/proc/iomem" ]] ; then
echo "Error, can not access /proc/iomem."
return 1
fi
arch=$(lscpu | grep Architecture | awk -F ":" '{ print $2 }' | tr [:lower:] [:upper:])
if [ $arch == "X86_64" ] || [ $arch == "S390X" ]; then
ck_cmdline="1G-4G:160M,4G-64G:192M,64G-1T:256M,1T-:512M"
elif [ $arch == "AARCH64" ]; then
ck_cmdline="2G-:448M"
elif [ $arch == "PPC64LE" ]; then
if is_fadump_capable; then
ck_cmdline="4G-16G:768M,16G-64G:1G,64G-128G:2G,128G-1T:4G,1T-2T:6G,2T-4T:12G,4T-8T:20G,8T-16T:36G,16T-32T:64G,32T-64T:128G,64T-:180G"
else
ck_cmdline="2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G"
fi
fi
ck_cmdline=$(echo $ck_cmdline | sed -e 's/-:/-102400T:/g')
sys_mem=$(get_system_size)
result=$(get_recommend_size $sys_mem "$ck_cmdline")
echo $result
return 0
}
# Print all underlying crypt devices of a block device
# print nothing if device is not on top of a crypt device
# $1: the block device to be checked in maj:min format
get_luks_crypt_dev()
{
[[ -b /dev/block/$1 ]] || return 1
local _type=$(eval "$(blkid -u filesystem,crypto -o export -- /dev/block/$1); echo \$TYPE")
[[ $_type == "crypto_LUKS" ]] && echo $1
for _x in /sys/dev/block/$1/slaves/*; do
[[ -f $_x/dev ]] || continue
[[ $_x/subsystem -ef /sys/class/block ]] || continue
get_luks_crypt_dev "$(< "$_x/dev")"
done
}
# kdump_get_maj_min <device>
# Prints the major and minor of a device node.
# Example:
# $ get_maj_min /dev/sda2
# 8:2
kdump_get_maj_min() {
local _majmin
_majmin="$(stat -L -c '%t:%T' "$1" 2> /dev/null)"
printf "%s" "$((0x${_majmin%:*})):$((0x${_majmin#*:}))"
}
get_all_kdump_crypt_dev()
{
local _dev _crypt
for _dev in $(get_block_dump_target); do
_crypt=$(get_luks_crypt_dev $(kdump_get_maj_min "$_dev"))
[[ -n "$_crypt" ]] && echo $_crypt
done
}
kdumpctl: Add kdumpctl estimate Resolves: bz1951415 Upstream: fedora Conflict: none commit e9e6a2c745d41f5447c0062525c0e4f3f489b903 Author: Kairui Song <kasong@redhat.com> Date: Thu Apr 22 03:27:10 2021 +0800 kdumpctl: Add kdumpctl estimate Add a rough esitimation support, currently, following memory usage are checked by this sub command: - System RAM - Kdump Initramfs size - Kdump Kernel image size - Kdump Kernel module size - Kdump userspace user and other runtime allocated memory (currently simply using a fixed value: 64M) - LUKS encryption memory usage The output of kdumpctl estimate looks like this: # kdumpctl estimate Reserved crashkernel: 256M Recommanded crashkernel: 160M Kernel image size: 47M Kernel modules size: 12M Initramfs size: 19M Runtime reservation: 64M Large modules: xfs: 1892352 nouveau: 2318336 And if the kdump target is encrypted: # kdumpctl estimate Encrypted kdump target requires extra memory, assuming using the keyslot with minimun memory requirement Reserved crashkernel: 256M Recommanded crashkernel: 655M Kernel image size: 47M Kernel modules size: 12M Initramfs size: 19M Runtime reservation: 64M LUKS required size: 512M Large modules: xfs: 1892352 nouveau: 2318336 WARNING: Current crashkernel size is lower than recommanded size 655M. The "Recommanded" value is calculated based on memory usages mentioned above, and will be adjusted accodingly to be no less than the value provided by kdump_get_arch_recommend_size. Signed-off-by: Kairui Song <kasong@redhat.com> Acked-by: Pingfan Liu <piliu@redhat.com> Signed-off-by: Kairui Song <kasong@redhat.com>
2021-04-21 19:27:10 +00:00
check_vmlinux()
{
# Use readelf to check if it's a valid ELF
readelf -h $1 &>/dev/null || return 1
}
get_vmlinux_size()
{
local size=0
while read _type _offset _virtaddr _physaddr _fsize _msize _flg _aln; do
size=$(( $size + $_msize ))
done <<< $(readelf -l -W $1 | grep "^ LOAD" 2>/dev/stderr)
echo $size
}
try_decompress()
{
# The obscure use of the "tr" filter is to work around older versions of
# "grep" that report the byte offset of the line instead of the pattern.
# Try to find the header ($1) and decompress from here
for pos in `tr "$1\n$2" "\n$2=" < "$4" | grep -abo "^$2"`
do
if ! type -P $3 > /dev/null; then
ddebug "Signiature detected but '$3' is missing, skip this decompressor"
break
fi
pos=${pos%%:*}
tail -c+$pos "$img" | $3 > $5 2> /dev/null
if check_vmlinux $5; then
ddebug "Kernel is extracted with '$3'"
return 0
fi
done
return 1
}
# Borrowed from linux/scripts/extract-vmlinux
get_kernel_size()
{
# Prepare temp files:
local img=$1 tmp=$(mktemp /tmp/vmlinux-XXX)
trap "rm -f $tmp" 0
# Try to check if it's a vmlinux already
check_vmlinux $img && get_vmlinux_size $img && return 0
# That didn't work, so retry after decompression.
try_decompress '\037\213\010' xy gunzip $img $tmp || \
try_decompress '\3757zXZ\000' abcde unxz $img $tmp || \
try_decompress 'BZh' xy bunzip2 $img $tmp || \
try_decompress '\135\0\0\0' xxx unlzma $img $tmp || \
try_decompress '\211\114\132' xy 'lzop -d' $img $tmp || \
try_decompress '\002!L\030' xxx 'lz4 -d' $img $tmp || \
try_decompress '(\265/\375' xxx unzstd $img $tmp
# Finally check for uncompressed images or objects:
[[ $? -eq 0 ]] && get_vmlinux_size $tmp && return 0
# Fallback to use iomem
local _size=0
for _seg in $(cat /proc/iomem | grep -E "Kernel (code|rodata|data|bss)" | cut -d ":" -f 1); do
_size=$(( $_size + 0x${_seg#*-} - 0x${_seg%-*} ))
done
echo $_size
}