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@@ -1083,6 +1083,18 @@ Bug Fixes since HDF5-1.12.0 release
(DER - 2021/11/23, HDFFV-11286)
+ - Fixed several potential MPI deadlocks in library failure conditions
+
+ In the parallel library, there were several places where MPI rank 0
+ could end up skipping past collective MPI operations when some failure
+ occurs in rank 0-specific processing. This would lead to deadlocks
+ where rank 0 completes an operation while other ranks wait in the
+ collective operation. These places have been rewritten to have rank 0
+ push an error and try to cleanup after the failure, then continue to
+ participate in the collective operation to the best of its ability.
+
+ (JTH - 2021/11/09)
+
- Fixed an issue with collective metadata reads being permanently disabled
after a dataset chunk lookup operation. This would usually cause a
mismatched MPI_Bcast and MPI_ERR_TRUNCATE issue in the library for