In latest rawhide kdump kernel reboot hangs because systemd reports a conflict when kdump calls reboot during booting. Need further investigation about the new systemd behavior. Here is the error message copied from kdump session: [snip] kdump: saving vmcore complete Failed to start reboot.target: Transaction contains conflicting jobs 'stop' and 'start' for shutdown.target. Probably contradicting requirement dependencies configured. Failed to talk to init daemon. [FAILED] Failed to start Kdump Vmcore Save Service. [snip] We previouly use "reboot -f" but later we changed to reboot because we want systemd to take care of the shutdown path, mainly for umount filesystems. Change back to "reboot -f" works but we still need umount by ourselves. During my tests with "reboot -f" I get below dirty ext2 filesystem: [root@localhost ~]# fsck /dev/vdb fsck from util-linux 2.27 e2fsck 1.42.13 (17-May-2015) /dev/vdb was not cleanly unmounted, check forced. Actually "reboot -f" equals to "systemctl reboot -f -f" systemctl manpage says "-f" and "-f -f" means different behavior: When use -f with reboot, will execute reboot without shutting down all units. However all processes will be killed forcibly and all file systems are unmounted or remounted read-only. If -f is specified twice, will reboot immediately without terminating any processes or unmounting any file systems. Thus change to use "systemctl reboot -f" for our reboot actions. It can fix the problem and at the same time it can ensure filesystems are umounted before rebooting. OTOH, a systemd changes cause the breakage, it may be a system service new design, Later I can dig into systemd changes see which commit cause the breakage. Signed-off-by: Dave Young <dyoung@redhat.com Signed-off-by: Dangyi Liu <dliu@redhat.com> Acked-by: Baoquan He <bhe@redhat.com>
164 lines
4.4 KiB
Bash
Executable File
164 lines
4.4 KiB
Bash
Executable File
# These variables and functions are useful in 2nd kernel
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. /lib/kdump-lib.sh
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KDUMP_PATH="/var/crash"
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CORE_COLLECTOR=""
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DEFAULT_CORE_COLLECTOR="makedumpfile -l --message-level 1 -d 31"
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DMESG_COLLECTOR="/sbin/vmcore-dmesg"
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DEFAULT_ACTION="systemctl reboot -f"
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DATEDIR=`date +%Y-%m-%d-%T`
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HOST_IP='127.0.0.1'
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DUMP_INSTRUCTION=""
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SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
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KDUMP_SCRIPT_DIR="/kdumpscripts"
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DD_BLKSIZE=512
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FINAL_ACTION="systemctl reboot -f"
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KDUMP_CONF="/etc/kdump.conf"
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KDUMP_PRE=""
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KDUMP_POST=""
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NEWROOT="/sysroot"
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get_kdump_confs()
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{
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local config_opt config_val
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while read config_opt config_val;
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do
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# remove inline comments after the end of a directive.
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config_val=$(strip_comments $config_val)
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case "$config_opt" in
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path)
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KDUMP_PATH="$config_val"
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;;
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core_collector)
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[ -n "$config_val" ] && CORE_COLLECTOR="$config_val"
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;;
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sshkey)
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if [ -f "$config_val" ]; then
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SSH_KEY_LOCATION=$config_val
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fi
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;;
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kdump_pre)
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KDUMP_PRE="$config_val"
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;;
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kdump_post)
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KDUMP_POST="$config_val"
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;;
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fence_kdump_args)
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FENCE_KDUMP_ARGS="$config_val"
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;;
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fence_kdump_nodes)
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FENCE_KDUMP_NODES="$config_val"
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;;
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default)
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case $config_val in
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shell)
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DEFAULT_ACTION="kdump_emergency_shell"
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;;
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reboot)
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DEFAULT_ACTION="systemctl reboot -f"
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;;
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halt)
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DEFAULT_ACTION="halt"
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;;
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poweroff)
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DEFAULT_ACTION="poweroff"
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;;
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dump_to_rootfs)
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DEFAULT_ACTION="dump_to_rootfs"
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;;
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esac
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;;
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esac
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done < $KDUMP_CONF
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if [ -z "$CORE_COLLECTOR" ]; then
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CORE_COLLECTOR="$DEFAULT_CORE_COLLECTOR"
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if is_ssh_dump_target || is_raw_dump_target; then
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CORE_COLLECTOR="$CORE_COLLECTOR -F"
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fi
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fi
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}
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# dump_fs <mount point| device>
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dump_fs()
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{
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local _dev=$(findmnt -k -f -n -r -o SOURCE $1)
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local _mp=$(findmnt -k -f -n -r -o TARGET $1)
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echo "kdump: dump target is $_dev"
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if [ -z "$_mp" ]; then
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echo "kdump: error: Dump target $_dev is not mounted."
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return 1
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fi
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# Remove -F in makedumpfile case. We don't want a flat format dump here.
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[[ $CORE_COLLECTOR = *makedumpfile* ]] && CORE_COLLECTOR=`echo $CORE_COLLECTOR | sed -e "s/-F//g"`
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echo "kdump: saving to $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
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mount -o remount,rw $_mp || return 1
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mkdir -p $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR || return 1
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save_vmcore_dmesg_fs ${DMESG_COLLECTOR} "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
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echo "kdump: saving vmcore"
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$CORE_COLLECTOR /proc/vmcore $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete || return 1
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mv $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore
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sync
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echo "kdump: saving vmcore complete"
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}
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save_vmcore_dmesg_fs() {
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local _dmesg_collector=$1
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local _path=$2
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echo "kdump: saving vmcore-dmesg.txt"
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$_dmesg_collector /proc/vmcore > ${_path}/vmcore-dmesg-incomplete.txt
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_exitcode=$?
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if [ $_exitcode -eq 0 ]; then
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mv ${_path}/vmcore-dmesg-incomplete.txt ${_path}/vmcore-dmesg.txt
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# Make sure file is on disk. There have been instances where later
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# saving vmcore failed and system rebooted without sync and there
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# was no vmcore-dmesg.txt available.
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sync
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echo "kdump: saving vmcore-dmesg.txt complete"
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else
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echo "kdump: saving vmcore-dmesg.txt failed"
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fi
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}
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dump_to_rootfs()
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{
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echo "Kdump: trying to bring up rootfs device"
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systemctl start dracut-initqueue
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echo "Kdump: waiting for rootfs mount, will timeout after 90 seconds"
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systemctl start sysroot.mount
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dump_fs $NEWROOT
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}
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kdump_emergency_shell()
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{
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echo "PS1=\"kdump:\\\${PWD}# \"" >/etc/profile
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/bin/dracut-emergency
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rm -f /etc/profile
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}
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do_default_action()
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{
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echo "Kdump: Executing default action $DEFAULT_ACTION"
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eval $DEFAULT_ACTION
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}
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do_final_action()
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{
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eval $FINAL_ACTION
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}
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