Comment # 2 on bug 103188 from Chris Wilson

commit 136100c2f00b590bc9485100cce012282c1217cf (HEAD, upstream/master)
Author: Jason Ekstrand <jason@jlekstrand.net>
Date:   Tue Oct 10 13:02:20 2017 -0700

    igt/syncobj_wait: Don't close the timeline early in wait_snapshot

    Closing the sw_sync timeline now signals any remaining fences upon it;
    but test_wait_snapshot requires the fence to continue to be busy so that
    the __syncobj_wait() will return with -ETIME.