#8834: 64-bit windows cabal.exe segfaults in GC ----------------------------------+---------------------------------- Reporter: awson | Owner: Type: bug | Status: patch Priority: highest | Milestone: 7.8.1 Component: Compiler | Version: 7.8.1-rc2 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 (amd64) Type of failure: Runtime crash | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: ----------------------------------+---------------------------------- Comment (by awson): I've inspected "bad" Cmm a bit and found [https://ghc.haskell.org/trac/ghc/attachment/ticket/8834/lines1_bad#L2276 this]: {{{ call (stg_gc_fun)(R1) args: 40, res: 0, upd: 8; c2gF: if (%MO_S_Le_W64(R5, 0)) goto c2gB; else goto c2gC; }}} `R5` is `r8` and is volatile on Win64. I don't see it restored before `%MO_S_Le_W64(R5, 0)` (honestly, I don't know what `%MO_S_Le_W64(R5, 0)` is). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8834#comment:41 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler