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Date: Mon, 17 Sep 2012 13:19:34 -0400
From: Josef Bacik <jbacik@fusionio.com>
To: Kay Sievers <kay@vrfy.org>
CC: btrfs <linux-btrfs@vger.kernel.org>,
        Lennart Poettering <lennart@poettering.net>
Subject: Re: 'umount' of multi-device volume hangs until the device is
 physically un-plugged
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On Sun, Sep 16, 2012 at 10:07:39PM -0600, Kay Sievers wrote:
> I'm currently playing around with native btrfs multi-device support in
> systemd. There might be a few "hotplug issues" to solve, here is the
> first one:
> 
> A mounted (otherwise unused) multi-device volume (USB multi-slot card
> reader), hangs at:
>   $ umount /mnt
> with (fedora) kernel
>   3.6.0-0.rc5.git0.1.fc18.x86_64
> 
> Any idea what to look for or what to try?
> 

Can I see the whole sysrq+w?  Also can you try btrfs-next and see if you have
the same problems?  Thanks,

Josef