problem booting to multi-vdev root pool [Was: kern/150503: [zfs] ZFS disks are UNAVAIL and corrupted after reboot]

Guido Falsi mad at
Fri Nov 16 16:17:15 UTC 2012

On 11/16/12 16:45, Andriy Gapon wrote:
> on 13/11/2012 18:16 Guido Falsi said the following:
>> My idea, but is just a speculation, i could be very wrong, is that the geom
>> tasting code has some problem with multiple vdev root pools.
> Guido,
> you are absolutely correct.  The code for reconstructing/tasting a root pool
> configuration is a modified upstream code, so it inherited a limitation from it:
> the support for only a single top-level vdev in a root pool.
> I have an idea how to add the missing support, but it turned out not to be
> something that I can hack together in couple of hours.

I can imagine, it does not look simple in any way!

> So, instead I wrote the following patch that should fall back to using a root pool
> configuration from zpool.cache (if it's present there) for a multi-vdev root pool:
> The patch also fixes a minor (single-time) memory leak.
> Guido, Bartosz,
> could you please test the patch?

I have just compiler an r242910 kernel with this patch (and just this 
one) applied.

System booted so it seems to work fine! :)

> Apologies for the breakage.

No worries, and thanks for this fix.

Also thanks for all the work on ZFS!

Guido Falsi <mad at>

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