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H A Dtest-bdrv-drain.cebd31837618cdc7bda83090773dcdd87475d55b7 Fri Mar 23 11:40:21 UTC 2018 Kevin Wolf <kwolf@redhat.com> test-bdrv-drain: Test node deletion in subtree recursion

If bdrv_do_drained_begin() polls during its subtree recursion, the graph
can change and mess up the bs->children iteration. Test that this
doesn't happen.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>