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Description of problem:
Running grubby even to add kernel parameters to the command-line and then rebooting "hard" (power outage or open file descriptor in /boot) often results in boot issues.
Booting manually, or mounting (and playing the journal) of the /boot filesystem repairs the issue most of the time.


Version-Release number of selected component (if applicable):
grubby-0.28-17.el7
though looking at upstream ( https://github.com/rhboot/grubby ) all versions up to and including 34b1436ccbd56eab8024314cab48f2fc880eef08 seem problematic.


How reproducible:
Nearly always.


Steps to Reproduce:
1. Create a RHEL7 VM called rhel7-vm in KVM, with IP=192.168.122.10
2. Run "ssh root@$192.168.122.10 grubby --args elevator=deadline --update-kernel DEFAULT && virsh destroy rhel7-vm"
3. Run "virsh start rhel7-vm"

Actual results:
VM is stopped at grub prompt due to a missing grub.cfg configuration file: this is typically repaired by a filesystem journal replay.


Expected results:
VM boots.


Additional info:
writeConfig() doesn't close its configuration file before rename() is called, nor when/before the process exits successfully. 

fsync() is not called on the configuration file nor on the configuration directory.

Upstream PR: https://github.com/rhboot/grubby/pull/24

Red Hat Enterprise Linux 7 shipped it's final minor release on September 29th, 2020. 7.9 was the last minor releases scheduled for RHEL 7.
From intial triage it does not appear the remaining Bugzillas meet the inclusion criteria for Maintenance Phase 2 and will now be closed. 

From the RHEL life cycle page:
https://access.redhat.com/support/policy/updates/errata#Maintenance_Support_2_Phase
"During Maintenance Support 2 Phase for Red Hat Enterprise Linux version 7,Red Hat defined Critical and Important impact Security Advisories (RHSAs) and selected (at Red Hat discretion) Urgent Priority Bug Fix Advisories (RHBAs) may be released as they become available."

If this BZ was closed in error and meets the above criteria please re-open it flag for 7.9.z, provide suitable business and technical justifications, and follow the process for Accelerated Fixes:
https://source.redhat.com/groups/public/pnt-cxno/pnt_customer_experience_and_operations_wiki/support_delivery_accelerated_fix_release_handbook  

Feature Requests can re-opened and moved to RHEL 8 if the desired functionality is not already present in the product. 

Please reach out to the applicable Product Experience Engineer[0] if you have any questions or concerns.  

[0] https://bugzilla.redhat.com/page.cgi?id=agile_component_mapping.html&product=Red+Hat+Enterprise+Linux+7