Can't read in a Landsat geotiff and use multiple threads to write out different windows at the same time

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Ryan Avery #211 I moved this github issue over here since it seems like more of a usage/help question. Below is the issue with a reproducible example if you have a Landsat tif. https://github.com/mapbox/rasterio/issues/1681 The program fails at different windows when writing out windows with threads. This issue is related to this issue https://github.com/mapnik/node-mapnik/issues/437#issuecomment-103806098 I tried setting VRT_SHARED_SOURCE=0 with the rasterion.Env() context manager to allow threads to not step on each other but it didn't do anything. Have others encountered this issue and found a solution?
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