LoadNexusProcessed Is Unreliable on macOS about mantid HOT 4 CLOSED

This isn't actually an unreliable test. Running it twice in a script will crash on macOS, the test just revealed the failure. Tested on the nightly, mantid 6.9.1 and mantid 6.7. All crash.

It only seems to happen with the SingleCrystalLeanElasticPeakTable.nxs file, so it's now a question of working out what's wrong with the file or wrong with the loading process for those types of files.

When testing, the crash would often occur during the next test that's run. Interestingly, I think this is due to the original load of the file corrupting something on the heap, then the second load identifies the problem and crashes out. Guess based on this error message:

python3.10(16416,0x70000f855000) malloc: Heap corruption detected, free list is damaged at 0x600002a851e0
*** Incorrect guard value: 0
python3.10(16416,0x70000f855000) malloc: *** set a breakpoint in malloc_error_break to debug

Actual crash when using the breakpoint at malloc_error_break seems to occur in two places, inconsistently. Why this happens for this specific file, I'm not sure.

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Interesting. Thanks for tracking it down. Yes, I added the file. The context was to preserve the peak shape when saving/loading lean peaks workspaces.

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The file was created loading SingleCrystalPeakTable.nxs and converting to LeanElasticPeak

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Closed by #37515.

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