#!/bin/sh # # The main kdump routine in capture kernel # . /lib/dracut-lib.sh . /lib/kdump-logger.sh . /lib/kdump-lib-initramfs.sh #initiate the kdump logger dlog_init if [ $? -ne 0 ]; then echo "failed to initiate the kdump logger." exit 1 fi KDUMP_PATH="/var/crash" KDUMP_LOG_FILE="/run/initramfs/kexec-dmesg.log" CORE_COLLECTOR="" DEFAULT_CORE_COLLECTOR="makedumpfile -l --message-level 7 -d 31" DMESG_COLLECTOR="/sbin/vmcore-dmesg" FAILURE_ACTION="systemctl reboot -f" DATEDIR=`date +%Y-%m-%d-%T` HOST_IP='127.0.0.1' DUMP_INSTRUCTION="" SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa" DD_BLKSIZE=512 FINAL_ACTION="systemctl reboot -f" KDUMP_PRE="" KDUMP_POST="" NEWROOT="/sysroot" OPALCORE="/sys/firmware/opal/mpipl/core" set -o pipefail DUMP_RETVAL=0 get_kdump_confs() { while read -r config_opt config_val; do # remove inline comments after the end of a directive. case "$config_opt" in path) KDUMP_PATH="$config_val" ;; core_collector) [ -n "$config_val" ] && CORE_COLLECTOR="$config_val" ;; sshkey) if [ -f "$config_val" ]; then SSH_KEY_LOCATION=$config_val fi ;; kdump_pre) KDUMP_PRE="$config_val" ;; kdump_post) KDUMP_POST="$config_val" ;; fence_kdump_args) FENCE_KDUMP_ARGS="$config_val" ;; fence_kdump_nodes) FENCE_KDUMP_NODES="$config_val" ;; failure_action|default) case $config_val in shell) FAILURE_ACTION="kdump_emergency_shell" ;; reboot) FAILURE_ACTION="systemctl reboot -f && exit" ;; halt) FAILURE_ACTION="halt && exit" ;; poweroff) FAILURE_ACTION="systemctl poweroff -f && exit" ;; dump_to_rootfs) FAILURE_ACTION="dump_to_rootfs" ;; esac ;; final_action) case $config_val in reboot) FINAL_ACTION="systemctl reboot -f" ;; halt) FINAL_ACTION="halt" ;; poweroff) FINAL_ACTION="systemctl poweroff -f" ;; esac ;; esac done <<< "$(kdump_read_conf)" if [ -z "$CORE_COLLECTOR" ]; then CORE_COLLECTOR="$DEFAULT_CORE_COLLECTOR" if is_ssh_dump_target || is_raw_dump_target; then CORE_COLLECTOR="$CORE_COLLECTOR -F" fi fi } # store the kexec kernel log to a file. save_log() { dmesg -T > $KDUMP_LOG_FILE if command -v journalctl > /dev/null; then journalctl -ab >> $KDUMP_LOG_FILE fi chmod 600 $KDUMP_LOG_FILE } # dump_fs dump_fs() { local _exitcode local _mp=$1 local _op=$(get_mount_info OPTIONS target $_mp -f) ddebug "dump_fs _mp=$_mp _opts=$_op" if ! is_mounted "$_mp"; then dinfo "dump path \"$_mp\" is not mounted, trying to mount..." mount --target $_mp if [ $? -ne 0 ]; then derror "failed to dump to \"$_mp\", it's not a mount point!" return 1 fi fi # Remove -F in makedumpfile case. We don't want a flat format dump here. [[ $CORE_COLLECTOR = *makedumpfile* ]] && CORE_COLLECTOR=`echo $CORE_COLLECTOR | sed -e "s/-F//g"` local _dump_path=$(echo "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/" | tr -s /) dinfo "saving to $_dump_path" # Only remount to read-write mode if the dump target is mounted read-only. if [[ "$_op" = "ro"* ]]; then dinfo "Remounting the dump target in rw mode." mount -o remount,rw $_mp || return 1 fi mkdir -p $_dump_path || return 1 save_vmcore_dmesg_fs ${DMESG_COLLECTOR} "$_dump_path" save_opalcore_fs "$_dump_path" dinfo "saving vmcore" $CORE_COLLECTOR /proc/vmcore $_dump_path/vmcore-incomplete _exitcode=$? if [ $_exitcode -eq 0 ]; then mv $_dump_path/vmcore-incomplete $_dump_path/vmcore sync dinfo "saving vmcore complete" else derror "saving vmcore failed, _exitcode:$_exitcode" fi dinfo "saving the $KDUMP_LOG_FILE to $_dump_path/" save_log mv $KDUMP_LOG_FILE $_dump_path/ if [ $_exitcode -ne 0 ]; then return 1 fi # improper kernel cmdline can cause the failure of echo, we can ignore this kind of failure return 0 } save_vmcore_dmesg_fs() { local _dmesg_collector=$1 local _path=$2 dinfo "saving vmcore-dmesg.txt to ${_path}" $_dmesg_collector /proc/vmcore > ${_path}/vmcore-dmesg-incomplete.txt _exitcode=$? if [ $_exitcode -eq 0 ]; then mv ${_path}/vmcore-dmesg-incomplete.txt ${_path}/vmcore-dmesg.txt chmod 600 ${_path}/vmcore-dmesg.txt # Make sure file is on disk. There have been instances where later # saving vmcore failed and system rebooted without sync and there # was no vmcore-dmesg.txt available. sync dinfo "saving vmcore-dmesg.txt complete" else if [ -f ${_path}/vmcore-dmesg-incomplete.txt ]; then chmod 600 ${_path}/vmcore-dmesg-incomplete.txt fi derror "saving vmcore-dmesg.txt failed" fi } save_opalcore_fs() { local _path=$1 if [ ! -f $OPALCORE ]; then # Check if we are on an old kernel that uses a different path if [ -f /sys/firmware/opal/core ]; then OPALCORE="/sys/firmware/opal/core" else return 0 fi fi dinfo "saving opalcore:$OPALCORE to ${_path}/opalcore" cp $OPALCORE ${_path}/opalcore if [ $? -ne 0 ]; then derror "saving opalcore failed" return 1 fi sync dinfo "saving opalcore complete" return 0 } dump_to_rootfs() { if [[ $(systemctl status dracut-initqueue | sed -n "s/^\s*Active: \(\S*\)\s.*$/\1/p") == "inactive" ]]; then dinfo "Trying to bring up initqueue for rootfs mount" systemctl start dracut-initqueue fi dinfo "Clean up dead systemd services" systemctl cancel dinfo "Waiting for rootfs mount, will timeout after 90 seconds" systemctl start --no-block sysroot.mount _loop=0 while [ $_loop -lt 90 ] && ! is_mounted /sysroot; do sleep 1 _loop=$((_loop + 1)) done if ! is_mounted /sysroot; then derror "Failed to mount rootfs" return fi ddebug "NEWROOT=$NEWROOT" dump_fs $NEWROOT } kdump_emergency_shell() { ddebug "Switching to kdump emergency shell..." [ -f /etc/profile ] && . /etc/profile export PS1='kdump:${PWD}# ' . /lib/dracut-lib.sh if [ -f /dracut-state.sh ]; then . /dracut-state.sh 2>/dev/null fi source_conf /etc/conf.d type plymouth >/dev/null 2>&1 && plymouth quit source_hook "emergency" while read _tty rest; do ( echo echo echo 'Entering kdump emergency mode.' echo 'Type "journalctl" to view system logs.' echo 'Type "rdsosreport" to generate a sosreport, you can then' echo 'save it elsewhere and attach it to a bug report.' echo echo ) > /dev/$_tty done < /proc/consoles sh -i -l /bin/rm -f -- /.console_lock } do_failure_action() { dinfo "Executing failure action $FAILURE_ACTION" eval $FAILURE_ACTION } do_final_action() { dinfo "Executing final action $FINAL_ACTION" eval $FINAL_ACTION } do_dump() { local _ret eval $DUMP_INSTRUCTION _ret=$? if [ $_ret -ne 0 ]; then derror "saving vmcore failed" fi return $_ret } do_kdump_pre() { local _ret if [ -n "$KDUMP_PRE" ]; then "$KDUMP_PRE" _ret=$? if [ $_ret -ne 0 ]; then derror "$KDUMP_PRE exited with $_ret status" return $_ret fi fi # if any script fails, it just raises warning and continues if [ -d /etc/kdump/pre.d ]; then for file in /etc/kdump/pre.d/*; do "$file" _ret=$? if [ $_ret -ne 0 ]; then derror "$file exited with $_ret status" fi done fi return 0 } do_kdump_post() { local _ret if [ -d /etc/kdump/post.d ]; then for file in /etc/kdump/post.d/*; do "$file" "$1" _ret=$? if [ $_ret -ne 0 ]; then derror "$file exited with $_ret status" fi done fi if [ -n "$KDUMP_POST" ]; then "$KDUMP_POST" "$1" _ret=$? if [ $_ret -ne 0 ]; then derror "$KDUMP_POST exited with $_ret status" fi fi } dump_raw() { local _raw=$1 [ -b "$_raw" ] || return 1 dinfo "saving to raw disk $_raw" if ! $(echo -n $CORE_COLLECTOR|grep -q makedumpfile); then _src_size=`ls -l /proc/vmcore | cut -d' ' -f5` _src_size_mb=$(($_src_size / 1048576)) /kdumpscripts/monitor_dd_progress $_src_size_mb & fi dinfo "saving vmcore" $CORE_COLLECTOR /proc/vmcore | dd of=$_raw bs=$DD_BLKSIZE >> /tmp/dd_progress_file 2>&1 || return 1 sync dinfo "saving vmcore complete" return 0 } dump_ssh() { local _ret=0 local _exitcode=0 _exitcode2=0 local _opt="-i $1 -o BatchMode=yes -o StrictHostKeyChecking=yes" local _dir="$KDUMP_PATH/$HOST_IP-$DATEDIR" local _host=$2 local _vmcore="vmcore" if is_ipv6_address "$_host"; then _scp_address=${_host%@*}@"[${_host#*@}]" else _scp_address=$_host fi dinfo "saving to $_host:$_dir" cat /var/lib/random-seed > /dev/urandom ssh -q $_opt $_host mkdir -p $_dir || return 1 save_vmcore_dmesg_ssh ${DMESG_COLLECTOR} ${_dir} "${_opt}" "$_host" dinfo "saving vmcore" save_opalcore_ssh ${_dir} "${_opt}" "$_host" "$_scp_address" if [ "${CORE_COLLECTOR%%[[:blank:]]*}" = "scp" ]; then scp -q $_opt /proc/vmcore "$_scp_address:$_dir/vmcore-incomplete" _exitcode=$? else $CORE_COLLECTOR /proc/vmcore | ssh $_opt $_host "umask 0077 && dd bs=512 of=$_dir/vmcore-incomplete" _exitcode=$? _vmcore="vmcore.flat" fi if [ $_exitcode -eq 0 ]; then ssh $_opt $_host "mv $_dir/vmcore-incomplete $_dir/$_vmcore" _exitcode2=$? if [ $_exitcode2 -ne 0 ]; then derror "moving vmcore failed, _exitcode:$_exitcode2" else dinfo "saving vmcore complete" fi else derror "saving vmcore failed, _exitcode:$_exitcode" fi dinfo "saving the $KDUMP_LOG_FILE to $_host:$_dir/" save_log scp -q $_opt $KDUMP_LOG_FILE "$_scp_address:$_dir/" _ret=$? if [ $_ret -ne 0 ]; then derror "saving log file failed, _exitcode:$_ret" fi if [ $_exitcode -ne 0 ] || [ $_exitcode2 -ne 0 ];then return 1 fi return 0 } save_opalcore_ssh() { local _path=$1 local _opts="$2" local _location=$3 local _scp_address=$4 ddebug "_path=$_path _opts=$_opts _location=$_location" if [ ! -f $OPALCORE ]; then # Check if we are on an old kernel that uses a different path if [ -f /sys/firmware/opal/core ]; then OPALCORE="/sys/firmware/opal/core" else return 0 fi fi dinfo "saving opalcore:$OPALCORE to $_location:$_path" scp $_opts $OPALCORE $_scp_address:$_path/opalcore-incomplete if [ $? -ne 0 ]; then derror "saving opalcore failed" return 1 fi ssh $_opts $_location mv $_path/opalcore-incomplete $_path/opalcore dinfo "saving opalcore complete" return 0 } save_vmcore_dmesg_ssh() { local _dmesg_collector=$1 local _path=$2 local _opts="$3" local _location=$4 dinfo "saving vmcore-dmesg.txt to $_location:$_path" $_dmesg_collector /proc/vmcore | ssh $_opts $_location "umask 0077 && dd of=$_path/vmcore-dmesg-incomplete.txt" _exitcode=$? if [ $_exitcode -eq 0 ]; then ssh -q $_opts $_location mv $_path/vmcore-dmesg-incomplete.txt $_path/vmcore-dmesg.txt dinfo "saving vmcore-dmesg.txt complete" else derror "saving vmcore-dmesg.txt failed" fi } get_host_ip() { local _host if is_nfs_dump_target || is_ssh_dump_target then kdumpnic=$(getarg kdumpnic=) [ -z "$kdumpnic" ] && derror "failed to get kdumpnic!" && return 1 _host=`ip addr show dev $kdumpnic|grep '[ ]*inet'` [ $? -ne 0 ] && derror "wrong kdumpnic: $kdumpnic" && return 1 _host=`echo $_host | head -n 1 | cut -d' ' -f2` _host="${_host%%/*}" [ -z "$_host" ] && derror "wrong kdumpnic: $kdumpnic" && return 1 HOST_IP=$_host fi return 0 } read_kdump_confs() { if [ ! -f "$KDUMP_CONFIG_FILE" ]; then derror "$KDUMP_CONFIG_FILE not found" return fi get_kdump_confs # rescan for add code for dump target while read config_opt config_val; do # remove inline comments after the end of a directive. case "$config_opt" in dracut_args) config_val=$(get_dracut_args_target "$config_val") if [ -n "$config_val" ]; then config_val=$(get_mntpoint_from_target "$config_val") DUMP_INSTRUCTION="dump_fs $config_val" fi ;; ext[234]|xfs|btrfs|minix|nfs) config_val=$(get_mntpoint_from_target "$config_val") DUMP_INSTRUCTION="dump_fs $config_val" ;; raw) DUMP_INSTRUCTION="dump_raw $config_val" ;; ssh) DUMP_INSTRUCTION="dump_ssh $SSH_KEY_LOCATION $config_val" ;; esac done <<< "$(kdump_read_conf)" } fence_kdump_notify() { if [ -n "$FENCE_KDUMP_NODES" ]; then $FENCE_KDUMP_SEND $FENCE_KDUMP_ARGS $FENCE_KDUMP_NODES & fi } if [ "$1" = "--error-handler" ]; then get_kdump_confs do_failure_action do_final_action exit $? fi # continue here only if we have to save dump. if [ -f /etc/fadump.initramfs ] && [ ! -f /proc/device-tree/rtas/ibm,kernel-dump ] && [ ! -f /proc/device-tree/ibm,opal/dump/mpipl-boot ]; then exit 0 fi read_kdump_confs fence_kdump_notify get_host_ip if [ $? -ne 0 ]; then derror "get_host_ip exited with non-zero status!" exit 1 fi if [ -z "$DUMP_INSTRUCTION" ]; then DUMP_INSTRUCTION="dump_fs $NEWROOT" fi do_kdump_pre if [ $? -ne 0 ]; then derror "kdump_pre script exited with non-zero status!" do_final_action # During systemd service to reboot the machine, stop this shell script running exit 1 fi make_trace_mem "kdump saving vmcore" '1:shortmem' '2+:mem' '3+:slab' do_dump DUMP_RETVAL=$? do_kdump_post $DUMP_RETVAL if [ $? -ne 0 ]; then derror "kdump_post script exited with non-zero status!" fi if [ $DUMP_RETVAL -ne 0 ]; then exit 1 fi do_final_action