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Description of problem:
This is a result of upstream changes in MD driver:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/md/raid0.c?h=v5.5-rc5&id=c84a1372df929033cb1a0441fb57bd3932f39ac9


How reproducible:
Always

Steps to Reproduce:
1. Take drives with different size

2. Create native RAID 0
# mdadm --create /dev/md/r0 --level=0 --chunk 128 --raid-devices=2 /dev/nvme5n1 /dev/nvme4n1 --run --force

Actual results:
Creation is blocked due to error.

Expected results:
Operation performs successfully.

Hi,
It is fixed by two upstream mdadm commits:
https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/commit/?id=027c099fd1a31fb3815e592de75d0791a22353b4
https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/commit/?id=329dfc28debb58ffe7bd1967cea00fc583139aca

Thanks,
Mariusz

Just to be on the same page on the kernel side:
commit c84a1372df929033cb1a0441fb57bd3932f39ac9  cherry-pick clean  md/raid0: avoid RAID0 data corruption due to layout confusion
Fixed in Version: kernel-4.18.0-147.12.el8

This bug has been fixed by 1800521. The problem in comment0 should be verified too during testing of 1800521

*** This bug has been marked as a duplicate of bug 1800521 ***