system: Linux mars.sprixweb.com 3.10.0-1160.119.1.el7.x86_64 #1 SMP Tue Jun 4 14:43:51 UTC 2024 x86_64

cmd: 

# These variables and functions are useful in 2nd kernel

. /lib/kdump-lib.sh

KDUMP_PATH="/var/crash"
CORE_COLLECTOR=""
DEFAULT_CORE_COLLECTOR="makedumpfile -l --message-level 1 -d 31"
DMESG_COLLECTOR="/sbin/vmcore-dmesg"
DEFAULT_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"
KDUMP_SCRIPT_DIR="/kdumpscripts"
DD_BLKSIZE=512
FINAL_ACTION="systemctl reboot -f"
KDUMP_CONF="/etc/kdump.conf"
KDUMP_PRE=""
KDUMP_POST=""
NEWROOT="/sysroot"

get_kdump_confs()
{
    local config_opt config_val

    while read 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"
            ;;
            default)
                case $config_val in
                    shell)
                        DEFAULT_ACTION="kdump_emergency_shell"
                    ;;
                    reboot)
                        DEFAULT_ACTION="systemctl reboot -f"
                    ;;
                    halt)
                        DEFAULT_ACTION="halt"
                    ;;
                    poweroff)
                        DEFAULT_ACTION="poweroff"
                    ;;
                    dump_to_rootfs)
                        DEFAULT_ACTION="dump_to_rootfs"
                    ;;
                esac
            ;;
        esac
    done <<< "$(read_strip_comments $KDUMP_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
}

# dump_fs <mount point| device>
dump_fs()
{

    local _dev=$(findmnt -k -f -n -r -o SOURCE $1)
    local _mp=$(findmnt -k -f -n -r -o TARGET $1)

    echo "kdump: dump target is $_dev"

    if [ -z "$_mp" ]; then
        echo "kdump: error: Dump target $_dev is not mounted."
        return 1
    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"`

    echo "kdump: saving to $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"

    mount -o remount,rw $_mp || return 1
    mkdir -p $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR || return 1

    save_vmcore_dmesg_fs ${DMESG_COLLECTOR} "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"

    echo "kdump: saving vmcore"
    $CORE_COLLECTOR /proc/vmcore $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete || return 1
    mv $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore
    sync

    echo "kdump: saving vmcore complete"
    # 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

    echo "kdump: saving vmcore-dmesg.txt"
    $_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

        # 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
        echo "kdump: saving vmcore-dmesg.txt complete"
    else
        echo "kdump: saving vmcore-dmesg.txt failed"
    fi
}

dump_to_rootfs()
{

    echo "Kdump: trying to bring up rootfs device"
    systemctl start dracut-initqueue
    echo "Kdump: waiting for rootfs mount, will timeout after 90 seconds"
    systemctl start sysroot.mount

    dump_fs $NEWROOT
}

kdump_emergency_shell()
{
    echo "PS1=\"kdump:\\\${PWD}# \"" >/etc/profile
    /bin/dracut-emergency
    rm -f /etc/profile
}

do_default_action()
{
    echo "Kdump: Executing default action $DEFAULT_ACTION"
    eval $DEFAULT_ACTION
}

do_final_action()
{
    eval $FINAL_ACTION
}