I suspect it's related to the large number of commits in my repo. I made some tweaks and succeeded to create the fast-import file. But I get:

All files in a single commit will be held temporarily in MemoryStore, so unless you have GBs of code in _single_ commit it shouldn't be a problem.

There's also a possiblity that Pharo was going too fast and didn't manage to GC it in time or there's a memory leak.

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fatal: Unsupported command: .
fast-import: dumping crash report to .git/fast_import_crash_10301

Do you recognize this error?��

Please look into the mentioned file, it should give you a context for the error (and then you can look into the import file around the same context).

Peter