#16017: ghc-8.6.1 and ghc-8.6.2 use a lot of memory · Issues · Glasgow Haskell Compiler / GHC

ghc-8.6.1 and ghc-8.6.2 use a lot of memory

Currently GHC uses a lot of memory to build a relatively small module and causes my CI to fail due to there being a 4G memory limit.

The source code can be found here:

https://github.com/haskell-works/hw-json/tree/73368cee21dc72eedd5291ba689f9abf10e7fcd2

The problem module is here:

https://github.com/haskell-works/hw-json/blob/73368cee21dc72eedd5291ba689f9abf10e7fcd2/test/HaskellWorks/Data/Json/Backend/Standard/Succinct/CursorSpec.hs

The build output follows:

cabal new-build --enable-tests --enable-benchmarks --project-file="cabal.project" -j${CABAL_THREADS:-4} all
Build profile: -w ghc-8.6.2 -O2
In order, the following will be built (use -v for more details):
 - hw-json-0.9.0.1 (lib) (first run)
 - hw-json-0.9.0.1 (test:hw-json-test) (first run)
 - hw-json-0.9.0.1 (exe:hw-json) (first run)
 - hw-json-0.9.0.1 (bench:bench) (first run)
Configuring library for hw-json-0.9.0.1..
Preprocessing library for hw-json-0.9.0.1..
Building library for hw-json-0.9.0.1..
[ 1 of 32] Compiling HaskellWorks.Data.Json.DecodeError ( src/HaskellWorks/Data/Json/DecodeError.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/DecodeError.o )
[ 2 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.MakeIndex ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/MakeIndex.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/MakeIndex.o )
[ 3 of 32] Compiling HaskellWorks.Data.Json.Internal.Index ( src/HaskellWorks/Data/Json/Internal/Index.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Index.o )
[ 4 of 32] Compiling HaskellWorks.Data.Json.Internal.PartialIndex ( src/HaskellWorks/Data/Json/Internal/PartialIndex.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/PartialIndex.o )
[ 5 of 32] Compiling HaskellWorks.Data.Json.Internal.Token.Types ( src/HaskellWorks/Data/Json/Internal/Token/Types.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Token/Types.o )
[ 6 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.Token.Tokenize ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/Token/Tokenize.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/Token/Tokenize.o )
[ 7 of 32] Compiling HaskellWorks.Data.Json.Internal.Token ( src/HaskellWorks/Data/Json/Internal/Token.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Token.o )
[ 8 of 32] Compiling HaskellWorks.Data.Json.Internal.Value ( src/HaskellWorks/Data/Json/Internal/Value.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Value.o )
[ 9 of 32] Compiling HaskellWorks.Data.Json.Internal.Word8 ( src/HaskellWorks/Data/Json/Internal/Word8.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Word8.o )
[10 of 32] Compiling HaskellWorks.Data.Json.Internal.Word64 ( src/HaskellWorks/Data/Json/Internal/Word64.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Word64.o )
[11 of 32] Compiling HaskellWorks.Data.Json.Internal.CharLike ( src/HaskellWorks/Data/Json/Internal/CharLike.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/CharLike.o )
[12 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.Blank ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/Blank.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/Blank.o )
[13 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.BlankedJson ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/BlankedJson.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/BlankedJson.o )
[14 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.ToInterestBits64 ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/ToInterestBits64.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/ToInterestBits64.o )
[15 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.ToBalancedParens64 ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/ToBalancedParens64.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/ToBalancedParens64.o )
[16 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.IbBp ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/IbBp.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/IbBp.o )
[17 of 32] Compiling HaskellWorks.Data.Json.Backend.Standard.SemiIndex ( src/HaskellWorks/Data/Json/Backend/Standard/SemiIndex.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Backend/Standard/SemiIndex.o )
[18 of 32] Compiling HaskellWorks.Data.Json.Backend.Simple.SemiIndex ( src/HaskellWorks/Data/Json/Backend/Simple/SemiIndex.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Backend/Simple/SemiIndex.o )
[19 of 32] Compiling HaskellWorks.Data.Json.LightJson ( src/HaskellWorks/Data/Json/LightJson.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/LightJson.o )
[20 of 32] Compiling HaskellWorks.Data.Json.PartialValue ( src/HaskellWorks/Data/Json/PartialValue.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/PartialValue.o )
[21 of 32] Compiling HaskellWorks.Data.Json.Type ( src/HaskellWorks/Data/Json/Type.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Type.o )
[22 of 32] Compiling HaskellWorks.Data.Json.Backend.Standard.Cursor ( src/HaskellWorks/Data/Json/Backend/Standard/Cursor.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Backend/Standard/Cursor.o )
[23 of 32] Compiling HaskellWorks.Data.Json.Cursor ( src/HaskellWorks/Data/Json/Cursor.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Cursor.o )
[24 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.Cursor.Token ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/Cursor/Token.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/Cursor/Token.o )
[25 of 32] Compiling HaskellWorks.Data.Json.Value ( src/HaskellWorks/Data/Json/Value.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Value.o )
[26 of 32] Compiling HaskellWorks.Data.Json.FromValue ( src/HaskellWorks/Data/Json/FromValue.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/FromValue.o )
[27 of 32] Compiling HaskellWorks.Data.Json.Backend.Standard.LoadCursor ( src/HaskellWorks/Data/Json/Backend/Standard/LoadCursor.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Backend/Standard/LoadCursor.o )
[28 of 32] Compiling HaskellWorks.Data.Json.LoadCursor ( src/HaskellWorks/Data/Json/LoadCursor.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/LoadCursor.o )
[29 of 32] Compiling HaskellWorks.Data.Json.Backend.Standard.Load ( src/HaskellWorks/Data/Json/Backend/Standard/Load.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Backend/Standard/Load.o )
[30 of 32] Compiling HaskellWorks.Data.Json.Load ( src/HaskellWorks/Data/Json/Load.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Load.o )
[31 of 32] Compiling HaskellWorks.Data.Json ( src/HaskellWorks/Data/Json.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json.o )
[32 of 32] Compiling Paths_hw_json    ( /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/autogen/Paths_hw_json.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/Paths_hw_json.o )
Configuring test suite 'hw-json-test' for hw-json-0.9.0.1..
Configuring benchmark 'bench' for hw-json-0.9.0.1..
Configuring executable 'hw-json' for hw-json-0.9.0.1..
Preprocessing test suite 'hw-json-test' for hw-json-0.9.0.1..
Building test suite 'hw-json-test' for hw-json-0.9.0.1..
Preprocessing executable 'hw-json' for hw-json-0.9.0.1..
Preprocessing benchmark 'bench' for hw-json-0.9.0.1..
Building benchmark 'bench' for hw-json-0.9.0.1..
Building executable 'hw-json' for hw-json-0.9.0.1..
[ 1 of 11] Compiling HaskellWorks.Data.Json.Backend.Standard.Succinct.Cursor.InterestBitsSpec ( test/HaskellWorks/Data/Json/Backend/Standard/Succinct/Cursor/InterestBitsSpec.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/t/hw-json-test/opt/build/hw-json-test/hw-json-test-tmp/HaskellWorks/Data/Json/Backend/Standard/Succinct/Cursor/InterestBitsSpec.o )
[1 of 2] Compiling Main             ( bench/Main.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/b/bench/opt/build/bench/bench-tmp/Main.o )
[1 of 7] Compiling App.Commands.Types ( app/App/Commands/Types.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/App/Commands/Types.o )
[2 of 7] Compiling App.Lens         ( app/App/Lens.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/App/Lens.o )
[3 of 7] Compiling App.Commands.Demo ( app/App/Commands/Demo.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/App/Commands/Demo.o )
[2 of 2] Compiling Paths_hw_json    ( /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/b/bench/opt/build/bench/autogen/Paths_hw_json.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/b/bench/opt/build/bench/bench-tmp/Paths_hw_json.o )
Linking /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/b/bench/opt/build/bench/bench ...
[4 of 7] Compiling App.Commands.CreateIndex ( app/App/Commands/CreateIndex.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/App/Commands/CreateIndex.o )
[5 of 7] Compiling App.Commands     ( app/App/Commands.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/App/Commands.o )
[ 2 of 11] Compiling HaskellWorks.Data.Json.Backend.Standard.Succinct.CursorSpec ( test/HaskellWorks/Data/Json/Backend/Standard/Succinct/CursorSpec.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/t/hw-json-test/opt/build/hw-json-test/hw-json-test-tmp/HaskellWorks/Data/Json/Backend/Standard/Succinct/CursorSpec.o )
[6 of 7] Compiling Main             ( app/Main.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/Main.o )
[7 of 7] Compiling Paths_hw_json    ( /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/autogen/Paths_hw_json.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/Paths_hw_json.o )
Linking /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json ...
cabal: Failed to build test:hw-json-test from hw-json-0.9.0.1. The build
process was killed (i.e. SIGKILL). The typical reason for this is that there
is not enough memory available (e.g. the OS killed a process using lots of
memory).

Exited with code 1

Trac metadata

Trac field	Value
Version	8.6.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

Currently GHC uses a lot of memory to build a relatively small module and causes my CI to fail due to there being a 4G memory limit.

The source code can be found here:

https://github.com/haskell-works/hw-json/tree/73368cee21dc72eedd5291ba689f9abf10e7fcd2

The problem module is here:

https://github.com/haskell-works/hw-json/blob/73368cee21dc72eedd5291ba689f9abf10e7fcd2/test/HaskellWorks/Data/Json/Backend/Standard/Succinct/CursorSpec.hs

The build output follows:

```
cabal new-build --enable-tests --enable-benchmarks --project-file="cabal.project" -j${CABAL_THREADS:-4} all
Build profile: -w ghc-8.6.2 -O2
In order, the following will be built (use -v for more details):
 - hw-json-0.9.0.1 (lib) (first run)
 - hw-json-0.9.0.1 (test:hw-json-test) (first run)
 - hw-json-0.9.0.1 (exe:hw-json) (first run)
 - hw-json-0.9.0.1 (bench:bench) (first run)
Configuring library for hw-json-0.9.0.1..
Preprocessing library for hw-json-0.9.0.1..
Building library for hw-json-0.9.0.1..
[ 1 of 32] Compiling HaskellWorks.Data.Json.DecodeError ( src/HaskellWorks/Data/Json/DecodeError.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/DecodeError.o )
[ 2 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.MakeIndex ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/MakeIndex.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/MakeIndex.o )
[ 3 of 32] Compiling HaskellWorks.Data.Json.Internal.Index ( src/HaskellWorks/Data/Json/Internal/Index.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Index.o )
[ 4 of 32] Compiling HaskellWorks.Data.Json.Internal.PartialIndex ( src/HaskellWorks/Data/Json/Internal/PartialIndex.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/PartialIndex.o )
[ 5 of 32] Compiling HaskellWorks.Data.Json.Internal.Token.Types ( src/HaskellWorks/Data/Json/Internal/Token/Types.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Token/Types.o )
[ 6 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.Token.Tokenize ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/Token/Tokenize.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/Token/Tokenize.o )
[ 7 of 32] Compiling HaskellWorks.Data.Json.Internal.Token ( src/HaskellWorks/Data/Json/Internal/Token.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Token.o )
[ 8 of 32] Compiling HaskellWorks.Data.Json.Internal.Value ( src/HaskellWorks/Data/Json/Internal/Value.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Value.o )
[ 9 of 32] Compiling HaskellWorks.Data.Json.Internal.Word8 ( src/HaskellWorks/Data/Json/Internal/Word8.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Word8.o )
[10 of 32] Compiling HaskellWorks.Data.Json.Internal.Word64 ( src/HaskellWorks/Data/Json/Internal/Word64.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Word64.o )
[11 of 32] Compiling HaskellWorks.Data.Json.Internal.CharLike ( src/HaskellWorks/Data/Json/Internal/CharLike.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/CharLike.o )
[12 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.Blank ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/Blank.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/Blank.o )
[13 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.BlankedJson ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/BlankedJson.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/BlankedJson.o )
[14 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.ToInterestBits64 ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/ToInterestBits64.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/ToInterestBits64.o )
[15 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.ToBalancedParens64 ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/ToBalancedParens64.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/ToBalancedParens64.o )
[16 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.IbBp ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/IbBp.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/IbBp.o )
[17 of 32] Compiling HaskellWorks.Data.Json.Backend.Standard.SemiIndex ( src/HaskellWorks/Data/Json/Backend/Standard/SemiIndex.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Backend/Standard/SemiIndex.o )
[18 of 32] Compiling HaskellWorks.Data.Json.Backend.Simple.SemiIndex ( src/HaskellWorks/Data/Json/Backend/Simple/SemiIndex.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Backend/Simple/SemiIndex.o )
[19 of 32] Compiling HaskellWorks.Data.Json.LightJson ( src/HaskellWorks/Data/Json/LightJson.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/LightJson.o )
[20 of 32] Compiling HaskellWorks.Data.Json.PartialValue ( src/HaskellWorks/Data/Json/PartialValue.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/PartialValue.o )
[21 of 32] Compiling HaskellWorks.Data.Json.Type ( src/HaskellWorks/Data/Json/Type.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Type.o )
[22 of 32] Compiling HaskellWorks.Data.Json.Backend.Standard.Cursor ( src/HaskellWorks/Data/Json/Backend/Standard/Cursor.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Backend/Standard/Cursor.o )
[23 of 32] Compiling HaskellWorks.Data.Json.Cursor ( src/HaskellWorks/Data/Json/Cursor.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Cursor.o )
[24 of 32] Compiling HaskellWorks.Data.Json.Internal.Backend.Standard.Cursor.Token ( src/HaskellWorks/Data/Json/Internal/Backend/Standard/Cursor/Token.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Internal/Backend/Standard/Cursor/Token.o )
[25 of 32] Compiling HaskellWorks.Data.Json.Value ( src/HaskellWorks/Data/Json/Value.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Value.o )
[26 of 32] Compiling HaskellWorks.Data.Json.FromValue ( src/HaskellWorks/Data/Json/FromValue.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/FromValue.o )
[27 of 32] Compiling HaskellWorks.Data.Json.Backend.Standard.LoadCursor ( src/HaskellWorks/Data/Json/Backend/Standard/LoadCursor.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Backend/Standard/LoadCursor.o )
[28 of 32] Compiling HaskellWorks.Data.Json.LoadCursor ( src/HaskellWorks/Data/Json/LoadCursor.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/LoadCursor.o )
[29 of 32] Compiling HaskellWorks.Data.Json.Backend.Standard.Load ( src/HaskellWorks/Data/Json/Backend/Standard/Load.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Backend/Standard/Load.o )
[30 of 32] Compiling HaskellWorks.Data.Json.Load ( src/HaskellWorks/Data/Json/Load.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json/Load.o )
[31 of 32] Compiling HaskellWorks.Data.Json ( src/HaskellWorks/Data/Json.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/HaskellWorks/Data/Json.o )
[32 of 32] Compiling Paths_hw_json    ( /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/autogen/Paths_hw_json.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/opt/build/Paths_hw_json.o )
Configuring test suite 'hw-json-test' for hw-json-0.9.0.1..
Configuring benchmark 'bench' for hw-json-0.9.0.1..
Configuring executable 'hw-json' for hw-json-0.9.0.1..
Preprocessing test suite 'hw-json-test' for hw-json-0.9.0.1..
Building test suite 'hw-json-test' for hw-json-0.9.0.1..
Preprocessing executable 'hw-json' for hw-json-0.9.0.1..
Preprocessing benchmark 'bench' for hw-json-0.9.0.1..
Building benchmark 'bench' for hw-json-0.9.0.1..
Building executable 'hw-json' for hw-json-0.9.0.1..
[ 1 of 11] Compiling HaskellWorks.Data.Json.Backend.Standard.Succinct.Cursor.InterestBitsSpec ( test/HaskellWorks/Data/Json/Backend/Standard/Succinct/Cursor/InterestBitsSpec.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/t/hw-json-test/opt/build/hw-json-test/hw-json-test-tmp/HaskellWorks/Data/Json/Backend/Standard/Succinct/Cursor/InterestBitsSpec.o )
[1 of 2] Compiling Main             ( bench/Main.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/b/bench/opt/build/bench/bench-tmp/Main.o )
[1 of 7] Compiling App.Commands.Types ( app/App/Commands/Types.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/App/Commands/Types.o )
[2 of 7] Compiling App.Lens         ( app/App/Lens.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/App/Lens.o )
[3 of 7] Compiling App.Commands.Demo ( app/App/Commands/Demo.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/App/Commands/Demo.o )
[2 of 2] Compiling Paths_hw_json    ( /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/b/bench/opt/build/bench/autogen/Paths_hw_json.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/b/bench/opt/build/bench/bench-tmp/Paths_hw_json.o )
Linking /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/b/bench/opt/build/bench/bench ...
[4 of 7] Compiling App.Commands.CreateIndex ( app/App/Commands/CreateIndex.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/App/Commands/CreateIndex.o )
[5 of 7] Compiling App.Commands     ( app/App/Commands.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/App/Commands.o )
[ 2 of 11] Compiling HaskellWorks.Data.Json.Backend.Standard.Succinct.CursorSpec ( test/HaskellWorks/Data/Json/Backend/Standard/Succinct/CursorSpec.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/t/hw-json-test/opt/build/hw-json-test/hw-json-test-tmp/HaskellWorks/Data/Json/Backend/Standard/Succinct/CursorSpec.o )
[6 of 7] Compiling Main             ( app/Main.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/Main.o )
[7 of 7] Compiling Paths_hw_json    ( /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/autogen/Paths_hw_json.hs, /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json-tmp/Paths_hw_json.o )
Linking /root/project/dist-newstyle/build/x86_64-linux/ghc-8.6.2/hw-json-0.9.0.1/x/hw-json/opt/build/hw-json/hw-json ...
cabal: Failed to build test:hw-json-test from hw-json-0.9.0.1. The build
process was killed (i.e. SIGKILL). The typical reason for this is that there
is not enough memory available (e.g. the OS killed a process using lots of
memory).

Exited with code 1
```

<details><summary>Trac metadata</summary>

| Trac field             | Value        |
| ---------------------- | ------------ |
| Version                | 8.6.2        |
| Type                   | Bug          |
| TypeOfFailure          | OtherFailure |
| Priority               | normal       |
| Resolution             | Unresolved   |
| Component              | Compiler     |
| Test case              |              |
| Differential revisions |              |
| BlockedBy              |              |
| Related                |              |
| Blocking               |              |
| CC                     |              |
| Operating system       |              |
| Architecture           |              |

</details>

Edited Aug 23, 2019 by John Ky

Discussion
Designs

ghc-8.6.1 and ghc-8.6.2 use a lot of memory

Linked issues