One person reported the same error message 7 years ago here: https://ghc.haskell.org/trac/ghc/ticket/5085 They were using git-annex get, not the assistant when it crashed. They also were able to git bisect git-annex's code and found an utterly innocuous commit that triggered whatever the problem is. (commit 828a84ba3341d4b7a84292d8b9002a8095dd2382) It's probably a memory problem, or a ghc bug, or a bug in some library that is doing something memory related and messes up, such that ghc's garbage collector sees bad data. -- see shy jo
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