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xen-devel
Re: [Xen-devel] losetup -d fails when domU is destroyed
On Mon, May 08, 2006 at 09:24:26AM -0600, Kirk Allan wrote:
> I do not see this happen very often, but every once in a while after a domU
> is destroyed the loop device is still in use. From the /var/log/messages
> file I see:
>
> May 8 08:54:00 kdell logger: /etc/xen/scripts/block: remove
> XENBUS_PATH=backend/vbd/3/768
>
> In the xen-hotplug.log there is an entry
>
> ioctl: LOOP_CLR_FD: Device or resource busy
>
> It appears that when the /etc/xen/scripts/block script goes to remove the
> device with the losetup -d ?$node? that the device is still busy and the
> command fails. But by the time you can enter losetup -d /dev/<loopdevice>
> from the command line, the device is no longer busy and the command
> succeeds.
>
> As a test I modified the /etc/xen/scripts/block script to sleep 1 and try
> the losetup -d again if the first try failed. After many attempts to cause
> the problem, it finally happened. The first losetup -d failed and the
> second succeeded. Although this worked, it doesn't seem to be the correct
> solution to the underlying problem. Any help or guidance would greatly be
> appreciated.
IIRC, we've had people report this before, but no-one's managed to get to the
root cause. I'd be happy to take a patch that just sleeps and retries a few
times if you can't find the root cause yourself.
You might also speak with Kurt Garloff about bug #374
(http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=374) which is similar,
though in his case the losetup -d failed when the domain had crashed.
Ewan.
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