#13967: Simplifier ticks exhausted (when trying UnfoldingDone) from using lots of ByteString Builder literals -------------------------------------+------------------------------------- Reporter: sergv | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Description changed by sergv: Old description:
I've tried to port Cabal's `Distribution.Simple.Build.PathsModule` from `String`s to `Data.ByteString.Builder`. The module uses lot's of string literals combined via `++`. After enabling `OverloadedStrings` and changing `++` to `Data.Semigroup.<>` I got an error message like in the subject.
I have reproduced the issue on self-contained example, attached.
``` $ cd "/tmp/ghc-ticks-exhausted-bug/" && stack build test-0.1.0.0: configure (lib) Configuring test-0.1.0.0... test-0.1.0.0: build (lib) Preprocessing library test-0.1.0.0... [1 of 1] Compiling Test ( Test.hs, .stack- work/dist/x86_64-linux/Cabal-1.24.2.0/build/Test.o )
/tmp/ghc-ticks-exhausted-bug/Test.hs:17:21: warning: [-Wunused-top-binds] Defined but not used: data constructor ‘Linux’
/tmp/ghc-ticks-exhausted-bug/Test.hs:22:29: warning: [-Wunused-top-binds] Defined but not used: data constructor ‘Arm’
<no location info>: error: ghc: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-linux): Simplifier ticks exhausted When trying UnfoldingDone $ To increase the limit, use -fsimpl-tick-factor=N (default 100) If you need to do this, let GHC HQ know, and what factor you needed To see detailed counts use -ddump-simpl-stats Total ticks: 184333
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
-- While building package test-0.1.0.0 using: /home/sergey/.stack/setup-exe-cache/x86_64-linux/Cabal- simple_mPHDZzAJ_1.24.2.0_ghc-8.0.2 --builddir=.stack- work/dist/x86_64-linux/Cabal-1.24.2.0 build lib:test --ghc-options " -ddump-hi -ddump-to-file" Process exited with code: ExitFailure 1
```
New description: I've tried to port Cabal's `Distribution.Simple.Build.PathsModule` from `String`s to `Data.ByteString.Builder`. The module uses lot's of string literals combined via `++`. After enabling `OverloadedStrings` and changing `++` to `Data.Semigroup.<>` I got an error message like in the subject. I have reproduced the issue on self-contained example, attached. {{{ $ cd "/tmp/ghc-ticks-exhausted-bug/" && stack build test-0.1.0.0: configure (lib) Configuring test-0.1.0.0... test-0.1.0.0: build (lib) Preprocessing library test-0.1.0.0... [1 of 1] Compiling Test ( Test.hs, .stack- work/dist/x86_64-linux/Cabal-1.24.2.0/build/Test.o ) /tmp/ghc-ticks-exhausted-bug/Test.hs:17:21: warning: [-Wunused-top-binds] Defined but not used: data constructor ‘Linux’ /tmp/ghc-ticks-exhausted-bug/Test.hs:22:29: warning: [-Wunused-top-binds] Defined but not used: data constructor ‘Arm’ <no location info>: error: ghc: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-linux): Simplifier ticks exhausted When trying UnfoldingDone $ To increase the limit, use -fsimpl-tick-factor=N (default 100) If you need to do this, let GHC HQ know, and what factor you needed To see detailed counts use -ddump-simpl-stats Total ticks: 184333 Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug -- While building package test-0.1.0.0 using: /home/sergey/.stack/setup-exe-cache/x86_64-linux/Cabal- simple_mPHDZzAJ_1.24.2.0_ghc-8.0.2 --builddir=.stack- work/dist/x86_64-linux/Cabal-1.24.2.0 build lib:test --ghc-options " -ddump-hi -ddump-to-file" Process exited with code: ExitFailure 1 }}} -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13967#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler