Why kdump fails to generate vmcore on CoreOS with error from coreos-propagate-multipath-conf?

Solution Unverified - Updated

Environment

  • RHOCP 4.14

Issue

  • Why kdump fails to generate vmcore on CoreOS with error from coreos-propagate-multipath-conf?
[   17.162904] coreos-propagate-multipath-conf[753]: info: propagating initrd multipath configuration
[   17.190100] coreos-propagate-multipath-conf[754]: '/etc/multipath.conf' -> '/sysroot/etc/'
[   17.222166] coreos-propagate-multipath-conf[754]: cp: cannot create regular file '/sysroot/etc/': Not a directory

Resolution

  • At the moment, applying following workaround will help kdump to save vmcore on multipath dumping target. Add below line in /etc/kdump.conf file and restart kdump service.
dracut_args --omit "coreos-multipath"

Root Cause

Diagnostic Steps

  • Following messages are observed in serial console log.
[   17.162904] coreos-propagate-multipath-conf[753]: info: propagating initrd multipath configuration
[   17.183455] systemd[1]: Reached target Basic System.
[   17.190100] coreos-propagate-multipath-conf[754]: '/etc/multipath.conf' -> '/sysroot/etc/'     <-----
[   17.222166] coreos-propagate-multipath-conf[754]: cp: cannot create regular file '/sysroot/etc/': Not a directory     <-----
[   17.252761] systemd[1]: Persist Osmet Files (ISO) was skipped because of an unmet condition check (ConditionKernelCommandLine=coreos.liveiso).
[   17.269220] systemd[1]: Acquire Live PXE rootfs Image was skipped because of an unmet condition check (ConditionPathExists=/run/ostree-live).
[   17.315764] systemd[1]: Persist Osmet Files (PXE) was skipped because of an unmet condition check (ConditionPathExists=/run/ostree-live).
[   17.356699] systemd[1]: Mounted /sysroot.
[   17.362521] systemd[1]: Reached target Initrd Root File System.
[   17.370462] systemd[1]: Starting CoreOS Propagate Multipath Configuration...
[   17.414818] systemd[1]: coreos-propagate-multipath-conf.service: Main process exited, code=exited, status=1/FAILURE     <-----
[   17.427899] systemd[1]: coreos-propagate-multipath-conf.service: Failed with result 'exit-code'.
[   17.439130] systemd[1]: Failed to start CoreOS Propagate Multipath Configuration.
[   17.482933] systemd[1]: Dependency failed for Initrd Default Target.
[   17.491449] systemd[1]: initrd.target: Job initrd.target/start failed with result 'dependency'.
[   17.502566] systemd[1]: initrd.target: Triggering OnFailure= dependencies.
[   17.511624] systemd[1]: coreos-propagate-multipath-conf.service: Triggering OnFailure= dependencies.     <-----
[   17.554138] systemd[1]: Stopped target Basic System.
[   17.561073] systemd[1]: Stopped target Subsequent (Not Ignition) boot complete.
[   17.570624] systemd[1]: Stopped target Ignition Subsequent Boot Disk Setup.
[   17.627273] systemd[1]: Stopped target Initrd Root Device.
[   17.649170] systemd[1]: Stopped target Initrd /usr File System.
[   17.661315] multipathd[534]: exit (signal)
[   17.671112] multipathd[534]: --------shut down-------
[   17.683138] kdump[769]: Kdump is using the default log level(3).
[   17.745109] systemd[1]: Stopped target Network.
[   17.751586] kdump[774]: Executing failure action systemctl reboot -f     <-----
[   17.759673] systemd[1]: Stopped target Path Units.
[   17.766030] kdump[777]: Executing final action systemctl reboot -f
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