Re: Issues with md raid 1 on kernel 6.18 after booting kernel 6.19rc1 once

[BugReports <bugreports61@gmail.com>]

Hi,

many thx for the clarification cause that makes a huge diff !

Br

Am 17.12.25 um 08:17 schrieb Yu Kuai:
> Hi,
>
> 在 2025/12/17 15:13, BugReports 写道:
>> ...
>>
>> We'll have to backport following patch into old kernels to make new
>> arrays to assemble in old
>> kernels.
>>
>> ....
>>
>>
>> The md array which i am talking about was not created with kernel
>> 6.19, it was created sometime in 2024.
>>
>> It was just used in kernel 6.19 and that broke compatibility with my
>> 6.18 kernel.
> I know, I mean any array that is created or assembled in new kernels will now have
> lsb field stored in metadata. This field is not defined in old kernels and that's why
> array can't assembled in old kernels, due to unknown metadata.
>
> This is what we have to do for new features, and we're planning to avoid the forward
> compatibility issue with the above patch that I mentioned.
>