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Date: Mon, 23 Jan 2012 22:31:20 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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To: Martin Ranne <martin.ranne@kockumsonics.com>
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Cc: "freebsd-fs@freebsd.org" <freebsd-fs@FreeBSD.org>
Subject: Re: zpool import reboots computer
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on 23/01/2012 20:33 Martin Ranne said the following:
> Have done some checking and found mc->mc_vd == NULL in the function vdev_mirror_io_start() where the while-loop is. 
> 
> while (children--) { 
>     mc = &mm->mm_child[c];
>     zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
>         mc->mc_vd, mc->mc_offset, zio->io_data, zio->io_size,
>         zio->io_type, zio->io_priority, 0,
>         vdev_mirror_child_done, mc));
>     c++;
> }
> 
> if i set a break before it runs zio_nowait() it will still crash the kernel. 
> What can i check next for it to be able to continue? Is it possible to have it ignore the child where mc_vd is NULL? I am also looking into what more I can do to debug it (adding code to print to console as i can not use kernel dumps).

Not sure.  If by "set a break" you mean inserting a break statement, try
continue instead.

-- 
Andriy Gapon