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From: Thomas Backman <serenity@exscape.org>
To: Kip Macy <kmacy@freebsd.org>
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Date: Fri, 10 Jul 2009 22:01:04 +0200
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Cc: freebsd-fs@freebsd.org, FreeBSD current <freebsd-current@freebsd.org>
Subject: Re: Reproducible ZFS panic,
	w/ script (Was: "New" ZFS crash on FS  (pool?) unmount/export)
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On Jul 10, 2009, at 21:27, Kip Macy wrote:

> "zfs export" does a forced unmount. We may not be properly handling
> dangling references.
>
> -Kip
>
> On Fri, Jul 10, 2009 at 12:25 PM, Thomas  
> Backman<serenity@exscape.org> wrote:
>> On Jul 10, 2009, at 21:01, Thomas Backman wrote:
>> ...

Just one more thing to add for me today: the crash always happens when  
exporting the slave. Constant send/recv loops multiple times a second,  
no sweat.  import/export of both pools multiple times a second,  
without any send/recv in between them, no sweat. Combined, however, it  
panics on "zpool export crashtestslave". (I verified this twice, once  
by changing stress() to simply run loads of incremental backups for a  
for a few minutes, break, and export the pools manually. Both times,  
the master pool was no problem, and it immediately panics on exporting  
the slave.)

Regards,
Thomas