I'm in the process of upgrading to GHC 8.6.4 on OpenBSD-6.5-amd64-stable ( https://github.com/blackgnezdo/ports/commits/ghc_864_may26)
I hit a bus error when porting fgl, but then reduced the problem to a trivially reproducible one below. I've also stored a log from -v9 run in https://gist.githubusercontent.com/blackgnezdo/633a4e499c9d8162d74fbf620c9c05ec/raw/5006c836a11995b78d8d23d8443be76d2f052f4c/ghc8.6.4-openbsd-ann-module-crash.txt % cat a.hs {-# ANN module "" #-} % /usr/local/bin/ghc -v --interactive a.hs GHCi, version 8.6.4: http://www.haskell.org/ghc/ :? for help Glasgow Haskell Compiler, Version 8.6.4, stage 2 booted by GHC version 8.4.2.20190113 Using binary package database: /usr/local/lib/ghc/package.conf.d/package.cache package flags [] loading package database /usr/local/lib/ghc/package.conf.d wired-in package ghc-prim mapped to ghc-prim-0.5.3 wired-in package integer-gmp mapped to integer-gmp-1.0.2.0 wired-in package base mapped to base-4.12.0.0 wired-in package rts mapped to rts wired-in package template-haskell mapped to template-haskell-2.14.0.0 wired-in package ghc mapped to ghc-8.6.4 package flags [] loading package database /usr/local/lib/ghc/package.conf.d wired-in package ghc-prim mapped to ghc-prim-0.5.3 wired-in package integer-gmp mapped to integer-gmp-1.0.2.0 wired-in package base mapped to base-4.12.0.0 wired-in package rts mapped to rts-1.0 wired-in package template-haskell mapped to template-haskell-2.14.0.0 wired-in package ghc mapped to ghc-8.6.4 *** Parser [source]: !!! Parser [source]: finished in 0.00 milliseconds, allocated 0.182 megabytes *** Desugar: *** Simplify [expr]: !!! Simplify [expr]: finished in 0.00 milliseconds, allocated 0.124 megabytes *** CorePrep [expr]: !!! CorePrep [expr]: finished in 10.00 milliseconds, allocated 1.763 megabytes *** ByteCodeGen [Ghci1]: !!! ByteCodeGen [Ghci1]: finished in 0.00 milliseconds, allocated 0.135 megabytes Loading package ghc-prim-0.5.3 ... linking ... done. Loading package integer-gmp-1.0.2.0 ... linking ... done. Loading package base-4.12.0.0 ... linking ... done. Search directories (user): Search directories (gcc): *** Parser [source]: !!! Parser [source]: finished in 0.00 milliseconds, allocated 0.050 megabytes *** Desugar: *** Simplify [expr]: !!! Simplify [expr]: finished in 10.00 milliseconds, allocated 0.069 megabytes *** CorePrep [expr]: !!! CorePrep [expr]: finished in 0.00 milliseconds, allocated 0.022 megabytes *** ByteCodeGen [Ghci1]: !!! ByteCodeGen [Ghci1]: finished in 0.00 milliseconds, allocated 0.082 megabytes *** Parser [source]: !!! Parser [source]: finished in 0.00 milliseconds, allocated 0.085 megabytes *** Desugar: *** Simplify [expr]: !!! Simplify [expr]: finished in 0.00 milliseconds, allocated 0.076 megabytes *** CorePrep [expr]: !!! CorePrep [expr]: finished in 0.00 milliseconds, allocated 0.022 megabytes *** ByteCodeGen [Ghci1]: !!! ByteCodeGen [Ghci1]: finished in 0.00 milliseconds, allocated 0.098 megabytes *** Chasing dependencies: Chasing modules from: !!! Chasing dependencies: finished in 0.00 milliseconds, allocated 0.017 megabytes Stable obj: [] Stable BCO: [] unload: retaining objs [] unload: retaining bcos [] Ready for upsweep [] Upsweep completely successful. *** Deleting temp files: Deleting: *** Chasing dependencies: Chasing modules from: */home/greg/a.hs !!! Chasing dependencies: finished in 10.00 milliseconds, allocated 0.215 megabytes Stable obj: [] Stable BCO: [] unload: retaining objs [] unload: retaining bcos [] Ready for upsweep [NONREC ModSummary { ms_hs_date = 2019-06-02 16:39:24.038862383 UTC ms_mod = Main, ms_textual_imps = [(Nothing, Prelude)] ms_srcimps = [] }] *** Deleting temp files: Deleting: compile: input file /home/greg/a.hs *** Checking old interface for Main (use -ddump-hi-diffs for more details): [1 of 1] Compiling Main ( /home/greg/a.hs, interpreted ) *** Parser [Main]: !!! Parser [Main]: finished in 0.00 milliseconds, allocated 0.049 megabytes *** Renamer/typechecker [Main]: *** Simplify [expr]: !!! Simplify [expr]: finished in 0.00 milliseconds, allocated 0.029 megabytes *** CorePrep [expr]: !!! CorePrep [expr]: finished in 0.00 milliseconds, allocated 0.010 megabytes *** ByteCodeGen [Ghci1]: !!! ByteCodeGen [Ghci1]: finished in 0.00 milliseconds, allocated 0.033 megabytes [1] 59488 bus error (core dumped) /usr/local/bin/ghc -v --interactive ~/a.hs -- nest.cx is Gmail hosted, use PGP: https://pgp.key-server.io/0x0B1542BD8DF5A1B0 Fingerprint: 5E2B 2D0E 1E03 2046 BEC3 4D50 0B15 42BD 8DF5 A1B0
