On Sat, Jun 11, 2022 at 11:14:38AM +0200, Pascal Hambourg wrote:
Please apply Upstream commit ea23994edc4169bd90d7a9b5908c6ccefd82fa40 to kernel versions 4.14, 4.19, 5.4 and above.
Reason: Commits c84a1372df929033cb1a0441fb57bd3932f39ac9 "md/raid0: avoid RAID0 data corruption due to layout confusion." and 33f2c35a54dfd75ad0e7e86918dcbe4de799a56c "md: add feature flag MD_FEATURE_RAID0_LAYOUT" added handling of original and alternate layouts of RAID0 arrays with members of different sizes. However they introduced a regression: assembly of such RAID0 array fails if the per-array or default layout is not defined even when the layout is irrelevant and can be safely ignored. One common case is when the RAID0 array is composed of two members of different sizes because the disk or partition sizes are slightly different. This patch aims to fix this regression.
Newer versions of mdadm can set a per-array RAID0 layout but some stable distributions such as Debian 10 ship an older version of mdadm which does not handle RAID0 layouts and a kernel series (4.19.y) which now includes the backported commits. As a result, assembly fails after the kernel upgrade unless the default layout is defined with a kernel parameter.
Related Debian bug reports : https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=944676 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=954816
Now queued up, thanks.
greg k-h