Re: [Xen-devel] [PATCH v3] xen-blkback: defer freeing blkif to avoid blocking xenwatch

[Valentin Priescu <vali.priescu@xxxxxxxxx>]

Hi Vasiliy,

Can you tell me more about the state of the md array? Are there any
requests pending on the device?
Did you suspend the array before you shutdown the domain? What's the
open count of the md device?

From your previous description, looks like the device still has
pending IO and the domain couldn't be entirely destroyed. Or something
messed up the refcnt and the blkif/vbd was never released.

--
Valentin

On Tue, Jun 3, 2014 at 10:07 AM, Vasiliy Tolstov <v.tolstov@xxxxxxxxx> wrote:
>
>
> I have latest 3.10.x kernel with this patch (link is
> https://gist.github.com/raw/3d7009a18dc920ba64fe)
> I'm create md device (raid1) /dev/md121 and start vm.
> After it shutdown my block script can't stop array because device or
> resource busy.
> Domains dies :
> xl list
> (null)                                       9     0     8     --p--d
> 129291.0
> (null)                                       2     0     4     --ps-d
> 1196.2
>

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