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Date:      Tue, 29 Sep 2009 10:53:40 +0200
From:      Borja Marcos <borjam@sarenet.es>
To:        Borja Marcos <borjam@sarenet.es>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: 8.0RC1, ZFS: deadlock
Message-ID:  <5A4D8AEF-4C87-400D-8F4F-198A31295963@sarenet.es>
In-Reply-To: <089F63A7-574B-4646-97C7-D82B226CD4CF@sarenet.es>
References:  <089F63A7-574B-4646-97C7-D82B226CD4CF@sarenet.es>

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On Sep 29, 2009, at 10:29 AM, Borja Marcos wrote:

> I have observed a deadlock condition when using ZFS. We are making a  
> heavy usage of zfs send/zfs receive to keep a replica of a dataset  
> on a remote machine. It can be done at one minute intervals. Maybe  
> we're doing a somehow atypical usage of ZFS, but, well, seems to be  
> a great solution to keep filesystem replicas once this is sorted out.

Not sure the backtraces screenshots will get through...

First one is the backtrace for the zfs command.

Second one, a tar process doing a "cf - ." on the dataset being  
replicated, sending to a pipe.

Third one, the receiving tar process, doing an "xf -" on a second  
dataset.


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