On 2017-05-09 19:33, Daniel P. Berrange wrote:
> On some distros, whenever you close a block device file
> descriptor there is a udev rule that resets the file
> permissions. This can race with the test script when
> we run qemu-io multiple times against the same block
> device. Occasionally the second qemu-io invocation
> will find udev has reset the permissions causing failure.
> 
> Reviewed-by: Eric Blake <eblake@redhat.com>
> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> ---
>  tests/qemu-iotests/149     |  13 +-
>  tests/qemu-iotests/149.out | 344 ++++++++++++++++++++++-----------------------
>  2 files changed, 178 insertions(+), 179 deletions(-)
> 
> diff --git a/tests/qemu-iotests/149 b/tests/qemu-iotests/149
> index 5faf585..bc628ce 100755
> --- a/tests/qemu-iotests/149
> +++ b/tests/qemu-iotests/149
> @@ -23,6 +23,7 @@
>  import subprocess
>  import os
>  import os.path
> +import time

Why?

Rest looks good.

Max