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Date: Wed, 19 Mar 2014 16:43:56 +0800
From: Liu Bo <bo.li.liu@oracle.com>
To: Juan Orti Alcaine <j.orti.alcaine@gmail.com>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: Another crash when deleting a large number of snapshots
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On Wed, Mar 19, 2014 at 08:52:37AM +0100, Juan Orti Alcaine wrote:
> This kind of crashes happens me very often when I delete a large
> number (+200) of snapshots at once.
> There is a very high IO for a while, and after that, the system
> freezed at intervals. I had to reboot the system to get it responsive
> again.
> 
> Versions used:
> kernel-3.13.6-200.fc20.x86_64
> btrfs-progs-3.12-1.fc20.x86_64
> 
> The log:
> http://ur1.ca/gvr3j

Not sure if this has been fixed...

Can you try btrfs-next or compile the kernel with CONFIG_DEBUG_SPINLOCK=y?

thanks,
-liubo