Quoting Jason Ekstrand (2017-10-10 21:02:20)
> 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.
Fwiw, you are not going mad as it did used to work. The change was
kernel commit ea4d5a270b57 ("dma-buf/sw_sync: force signal all
unsignaled fences on dying timeline")
-Chris
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