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RHEL 8.4 has an incorrect optimization in the write_begin codepath, such that we could corrupt data if writing to an offset beyond the EOF, but that is within a page that already has data.

There is a fix proposed here that should go into stable kernels v5.10..v5.12. We'll want the same fix for RHEL8.4.z and RHEL8.5.

https://lore.kernel.org/ceph-devel/20210612001141.167797-1-jlayton@kernel.org/T/#mfd7fe6b4251433bd7beb6f49e01fde50f370fc70

Hi Yogesh,
Plan for this BZ verification

I should mention too that there is a new xfstest for this problem:

    https://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git/commit/?id=80b8fe47d01347d9c5c433440861f41b8954463e

I recommend using that to verify this bug.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: kernel security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:4356