Note: This bug is displayed in read-only format because
the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Description of problem:
Mounting XFS partition formatted on RHEL9 fails, it is not even possible mount in read-only mode (regression when comparing RHEL7-RHEL8 case).
Version-Release number of selected component (if applicable):
kernel-4.18.0-357.el8.x86_64
How reproducible:
always
Steps to Reproduce:
1. create XFS partition using RHEL9 (USB flash drive should suffice, I have RHEL9 installed on another partition)
2. boot to RHEL8 (or insert created USB to RHEL8 system)
3. try to mount
4. try to mount read-only
Actual results:
step 3. fails, dmesg:
[ 93.310468] XFS (dm-4): Superblock has unknown read-only compatible features (0x8) enabled.
[ 93.310476] XFS (dm-4): Attempted to mount read-only compatible filesystem read-write.
[ 93.310479] XFS (dm-4): Filesystem can only be safely mounted read only.
[ 93.310485] XFS (dm-4): SB validate failed with error -22.
step 4. fails, dmesg:
[ 170.593298] XFS (dm-4): Superblock has unknown read-only compatible features (0x8) enabled.
[ 170.593306] XFS (dm-4): Superblock has unknown incompatible features (0x8) enabled.
[ 170.593309] XFS (dm-4): Filesystem cannot be safely mounted by this kernel.
[ 170.593315] XFS (dm-4): SB validate failed with error -22.
Expected results:
at least read-only should be possible, as it is when mounting RHEL8 partition in RHEL7.
Yes, RHEL8.6 and newer kernels will have the capability to mount filesystems with these new features. (It's really not a bug for older kernels to be unable to mount newer formats; that is by design.)
So this is either NOTABUG or NEXTRELEASE, I'll close it NEXTRELEASE since this will be resolved in RHEL8.6.