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Date: Wed, 21 Nov 2012 20:33:57 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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To: Willem Jan Withagen <wjw@digiware.nl>
Subject: Re: Some new hardware with 9.1 does not reboot easily
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on 21/11/2012 20:15 Willem Jan Withagen said the following:
> On 2012-11-21 19:11, Andriy Gapon wrote:
>> on 21/11/2012 20:08 Willem Jan Withagen said the following:
>>> On 2012-11-21 19:05, Andriy Gapon wrote:
>>>> on 21/11/2012 19:48 Willem Jan Withagen said the following:
>> [snip]
>>>>> It seems to to be waiting/working in the ZFS code to get things unmounted.
>>>>
>>>> Yeah, oops, this is a known ZFS deadlock in zfs_freebsd_reclaim -> zfs_zget path.
>>>> I may commit my fix for it to head on the next weekend.
>>>> You may share this information with the list.
>>>
>>> Any change of getting this back into 9.1?
>>> Preferably before 9.1-RELEASE, but otherwise real soon after that.
>>>
>>> I'm the perfect test guinea-pig, it happens every time I reboot.
>>
>> I will definitely MFC it to stable/9, just not sure if I would be able to do it
>> before New Year.  It definitely won't be in 9.1.  I'll send you a patch later.
> 
> Right,
> 
> As long as I can deliver it to the customer with this patch, it be great.
> 
> It is due to using more than 1 zfs pool?

I don't think so.
It appears to be dependent on filesystem usage/workload.

-- 
Andriy Gapon