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Date: Sat, 5 Jul 2014 11:34:28 +0200
From: Kristof Provost <kristof@sigsegv.be>
To: Vladislav Prodan <universite@ukr.net>
Subject: Re: ZFS panic on zvol resize
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On 2014-07-05 04:52:18 (+0300), Vladislav Prodan <universite@ukr.net> wrote:
> r268271
> # uname -a
> FreeBSD vm-10-2.domain.com 10.0-STABLE FreeBSD 10.0-STABLE #0: Sat Jul  5 04:38:25 EEST 2014     root@vm-10-2.domain.com:/usr/obj/usr/src/sys/vm-10-2.3  amd64
> 
> This sequence of commands does not cause panic:
> zfs create zroot/zvol
> zfs set mountpoint=none zroot/zvol
> zfs create -V1G zroot/zvol/disk0
> zfs set volsize=2G zroot/zvol/disk0
> 
> 
> Do you recommend to install revision r268263 and check again? or use larger disks - 200-400GB?
> 
No, the zvol size doesn't matter for me. I can reproduce it with 1G/2G
as well.

I'm also still seeing the panic on r268286 (11-current), so the version
you tested should have failed too.

Both of the affected systems are amd64, and both are running on raidz
(or raidz-2). I've also been able to reproduce it on a zpool on a single
disk.

Regards,
Kristof