Remove mpio vfd from default list processed by unknown driver#517
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markcmiller86 merged 3 commits into4.12RCfrom Mar 24, 2026
Merged
Remove mpio vfd from default list processed by unknown driver#517markcmiller86 merged 3 commits into4.12RCfrom
markcmiller86 merged 3 commits into4.12RCfrom
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Remove mpio vfd from default list processed by unknown driver
markcmiller86
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Merge pull request #517 from llnl/bug-mcm86-10feb26-unkdrvr-mpio
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This has never been seen before because most people link Silo against serial HDF5 and/or do not use Silo's
DB_UNKNOWNdriver when opening some file.The combination of linking to a parallel-enabled HDF5 library and using Silo's
DB_UNKNOWNto open a file could lead to a seg-fault in MPI.Because Silo can be used with a variety of HDF5 virtual file drivers (vfd), when opening an "unknown" file, different vfds maybe to be tried (e.g. split, family, silo-block-based, etc.). This list also included HDF5's built-in MPIO vfd if the HDF5 Silo was linked to was enabled with parallel. This would eventually trigger
MPI_xxx()calls in the HDF5 library whenMPI_Init()had not been called.This PR fixes this problem. It also fixes some problems running tests on macOS. The key patch commit for the funky MPI behavior is 7cb7983