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Date: Mon, 31 Mar 2014 10:55:24 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Idwer Vollering <vidwer@gmail.com>, freebsd-fs@FreeBSD.org
Subject: Re: ZFS panic: spin lock held too long
References: <CAPp9OrnFL-bNbocA++UqSb+W79QHr5=q_ZFQdod3N8SZ8=iOFQ@mail.gmail.com>
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on 30/03/2014 21:43 Idwer Vollering said the following:
> Unread portion of the kernel message buffer:
> spin lock 0xffffffff814fa030 (smp rendezvous) held by
> 0xfffff8000fb42920 (tid 100428) too long

Please note the tid and obtain a stack trace for that thread.
You can switch to the thread using 'tid' command in kgdb.

-- 
Andriy Gapon