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Add a testcase for the test fixed by commit 'async: the main AioContext is only "current" if under the BQL. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20210614110214.726722-1-pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Eric Blake <eblake@redhat.com>