#14272: GHC goes out of memory while compiling simple program with optimizations -------------------------------------+------------------------------------- Reporter: 39aldo39 | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by osa1): It seems to me that this may not be caused by allocation but maybe some code generation bug. I tried this: {{{ $ ghc-stage2 main.hs -O -fforce-recomp -ddump-ds -ddump-simpl -ddump-stg -ddump-to-file -dsuppress-all +RTS -M10000 ghc-stage2: maximum heap size (-M) is smaller than minimum alloc area size (-A) ghc-stage2: internal error: getTopHandlerThread: neither a WEAK nor a DEAD_WEAK: 0x7f9baeaa7fd8 0x7f9bae621270 -1991765780 (GHC version 8.3.20170914 for x86_64_unknown_linux) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug [1] 30799 abort ghc-stage2 main.hs -O -fforce-recomp -ddump-ds -ddump-simpl -ddump-stg +RTS $ ghc-stage2 main.hs -O -fforce-recomp -ddump-ds -ddump-simpl -ddump-stg -ddump-to-file -dsuppress-all +RTS -M100000 ghc-stage2: maximum heap size (-M) is smaller than minimum alloc area size (-A) reportHeapOverflow ghc-stage2: Heap exhausted; ghc-stage2: Current maximum heap size is 98304 bytes (0 MB). ghc-stage2: Use `+RTS -M<size>' to increase it. $ ghc-stage2 main.hs -O -fforce-recomp -ddump-ds -ddump-simpl -ddump-stg -ddump-to-file -dsuppress-all +RTS -M1000000 ghc-stage2: maximum heap size (-M) is smaller than minimum alloc area size (-A) ghc-stage2: panic! (the 'impossible' happened) (GHC version 8.3.20170914 for x86_64-unknown-linux): heap overflow Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} When I run without any RSTS parameters the error is triggered by `Storage.c:allocate` with these parameters: {{{ RtsFlags.GcFlags.maxHeapSize = 0 req_blocks = 1 LARGE_OBJECT_THRESHOLD: 3276 n: 2 }}} I don't know if `maxHeapSize = 0` is normal. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14272#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler