Re: STABLE-15: ZFS incorrectly orders metaslabs (?)

On Sat, Sep 13, 2025 at 12:21 AM Volodymyr Kostyrko <arcade@b1t.name> wrote:

> Hello.
>
> So I like, thought about looking at 15 on my book. As I'm normally using
> STABLE on my workplace and non-prod servers this wasn't that much scary,
> so I just went ahead and compiled kernel. Everything seems to be working
> pretty much fine, so I also updated world and kernel modules (so I can
> use desktop). Again, everything was working pretty much fine, so I went
> ahead rebuilding packages. And after a few dozen my host just stuck. I
> rebooted only to face instapanic on boot, someting like this:
>
> https://t.me/freebsd_ua/18931
>
> I tried booting from old kernel (STABLE-14), and suddenly host just
> booted. Then I tried repating steps under 15 to make sure it's real bug.
> And after some disk activity host stuck again. This time, however, 14
> wasn't able to boot too:
>
> https://t.me/freebsd_ua/18948
>
> My setup:
>
> * Custom kernel, mostly based off MINIMAL.
> * ZFS was NOT upgraded.
> * There was a number of features enabled on ZFS, like checksums, big
> blocks, dedup, etc.
>
> I'll try to boot GENERIC 15 on the pool to check.
>
> Hope that helps someone to debug the issue. Thanks.
>
> --
> Sphinx of black quartz judge my vow.
>

It's a known issue.  See https://github.com/openzfs/zfs/issues/15030 .