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This tests exercises graph locking, draining, and graph modifications with AioContext switches a lot. Amongst others, it serves as a regression test for bdrv_graph_wrlock() deadlocking because it is called with a locked AioContext and for AioContext handling in the NBD server. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20230517152834.277483-4-kwolf@redhat.com> Tested-by: Eric Blake <eblake@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>