[gdal-dev] Notice: issue about multi-threaded GTiff compression+decompression

[Even Rouault]

Hi,

For GDAL 3.6.0 to 3.7.2, use of multi-threaded GTiff 
compression+decompression, in particular within the same file, as for 
example in a "gdalwarp -co COMPRESS=... -co NUM_THREADS=..." workflow 
can lead to deadlocks (process stalled forever) and/or data corruption 
(sometimes without errors at generation). Cf 
https://github.com/OSGeo/gdal/issues/8470 for a reproducer. The fix is 
in https://github.com/OSGeo/gdal/pull/8561

The issue is particularly visible on Windows, or more generally any 
operating system (or file system where the output file is located) which 
has no VSIVirtualHandle::PRead() implementation, but it can also be 
occasionally reproduced on Linux (at least as a deadlock).

Even

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