October 2016 - ghc-tickets

[GHC] #11735: Optimize coercionKind
by GHC 20 Apr '18

20 Apr '18

#11735: Optimize coercionKind -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: task | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Currently, the `ForAllCo` case of `coercionKind` does an inefficient one- variable substitution. This could be improved by looking for nested `ForAllCo`s. Furthermore, perhaps we don't need an in-scope set and the full substitution machinery here. The subst is simply propagating the update of a tyvar's kind. No structural changes at all. No need for smart coercion constructors or other processing. So if we're going to optimize this, it might be worth making a specialized version of `subst_ty` and `subst_co` that operate over a `VarEnv Var` instead of a full substitution. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11735> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10037: Several profiling tests give different results optimised vs. unoptimised
by GHC 19 Apr '18

19 Apr '18

#10037: Several profiling tests give different results optimised vs. unoptimised -------------------------------------+------------------------------------- Reporter: simonmar | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.12.1 Component: Profiling | Version: 7.10.1-rc2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Most of the differences are relatively harmless (mostly CAF attribution), but it would be nice to get this right. In the meantime I'll mark them expect_broken and point to this ticket. The following tests in `tests/profiling/should_run` are affected: {{{ scc001 T2552 ioprof callstack001 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10037> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9074: GHC 7.8.2's ghci does not track missing symbols when loading non-Haskell object files
by GHC 17 Apr '18

17 Apr '18

#9074: GHC 7.8.2's ghci does not track missing symbols when loading non-Haskell object files ------------------------------------+------------------------------------- Reporter: massysett | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Keywords: | Operating System: Unknown/Multiple Architecture: Unknown/Multiple | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ------------------------------------+------------------------------------- I have a package that bundles in C library sources. I never had a problem with this when using GHC 7.6. In GHC 7.8, the order of the c-sources in the cabal file now matters. Sources must be listed earlier if they have symbols that subsequently loaded object files will need. If the c-sources are in the wrong order, when running "cabal repl" I get Loading object (static) dist/build/decnumber/src/decQuad.o ... ghc: panic! (the 'impossible' happened) (GHC version 7.8.2 for x86_64-unknown-linux): Loading temp shared object failed: /tmp/ghc14294_0/ghc14294_1.so: undefined symbol: DECSTICKYTAB Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug When using the same code and cabal file with GHC 7.6, "cabal repl" works fine: GHCi loads each static object (regardless of ordering in the cabal file), links up the necessary symbols, and launches successfully. Haskell Cafe discussion here: http://www.haskell.org/pipermail/haskell-cafe/2014-May/114041.html -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9074> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #11045: Loading temp shared object failed - undefined symbol
by GHC 17 Apr '18

17 Apr '18

#11045: Loading temp shared object failed - undefined symbol -------------------------------------+------------------------------------- Reporter: sjakobi | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Keywords: | Operating System: Linux Architecture: x86_64 | Type of failure: Compile-time (amd64) | crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- While re-compiling [https://github.com/commercialhaskell/stack stack]: {{{ $ stack install --ghc-options -O2 stack-0.1.7.0: configure Configuring stack-0.1.7.0... stack-0.1.7.0: build Preprocessing library stack-0.1.7.0... [30 of 74] Compiling Stack.Types.Docker ( src/Stack/Types/Docker.hs, .stack-work/dist/x86_64-linux/Cabal-1.22.4.0/build/Stack/Types/Docker.o ) [31 of 74] Compiling Options.Applicative.Complicated ( src/Options/Applicative/Complicated.hs, .stack- work/dist/x86_64-linux/Cabal-1.22.4.0/build/Options/Applicative/Complicated.o ) [32 of 74] Compiling Stack.Types.Config ( src/Stack/Types/Config.hs, .stack-work/dist/x86_64-linux/Cabal-1.22.4.0/build/Stack/Types/Config.o ) [33 of 74] Compiling Stack.Constants ( src/Stack/Constants.hs, .stack- work/dist/x86_64-linux/Cabal-1.22.4.0/build/Stack/Constants.o ) [Stack.Types.Config changed] [34 of 74] Compiling Stack.Types.Internal ( src/Stack/Types/Internal.hs, .stack-work/dist/x86_64-linux/Cabal-1.22.4.0/build/Stack/Types/Internal.o ) [Stack.Types.Config changed] [35 of 74] Compiling Stack.Types.StackT ( src/Stack/Types/StackT.hs, .stack-work/dist/x86_64-linux/Cabal-1.22.4.0/build/Stack/Types/StackT.o ) [36 of 74] Compiling Stack.Docker.GlobalDB ( src/Stack/Docker/GlobalDB.hs, .stack-work/dist/x86_64-linux/Cabal-1.22.4.0/build/Stack/Docker/GlobalDB.o ) [Stack.Types.Config changed] [37 of 74] Compiling Stack.Types.Package ( src/Stack/Types/Package.hs, .stack-work/dist/x86_64-linux/Cabal-1.22.4.0/build/Stack/Types/Package.o ) [Stack.Types.Config changed] [38 of 74] Compiling Stack.Types.Build ( src/Stack/Types/Build.hs, .stack- work/dist/x86_64-linux/Cabal-1.22.4.0/build/Stack/Types/Build.o ) [39 of 74] Compiling Stack.Types ( src/Stack/Types.hs, .stack- work/dist/x86_64-linux/Cabal-1.22.4.0/build/Stack/Types.o ) [Stack.Types.Build changed] [40 of 74] Compiling Stack.GhcPkg ( src/Stack/GhcPkg.hs, .stack- work/dist/x86_64-linux/Cabal-1.22.4.0/build/Stack/GhcPkg.o ) [Stack.Constants changed] [41 of 74] Compiling Stack.PackageIndex ( src/Stack/PackageIndex.hs, .stack-work/dist/x86_64-linux/Cabal-1.22.4.0/build/Stack/PackageIndex.o ) [Data.Binary.VersionTagged changed] ghc: panic! (the 'impossible' happened) (GHC version 7.10.2 for x86_64-unknown-linux): Loading temp shared object failed: /tmp/ghc22553_0/libghc_96.so: undefined symbol: stackzuFHzzONQT9HI3ATX2xQH198L_StackziTypesziCompiler_zdfBinaryCompilerVersionzuzdszdfGSumM2_closure Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug -- While building package stack-0.1.7.0 using: /home/simon/.stack/setup-exe-cache/setup-Simple- Cabal-1.22.4.0-x86_64-linux-ghc-7.10.2 --builddir=.stack- work/dist/x86_64-linux/Cabal-1.22.4.0/ build lib:stack exe:stack --ghc- options " -ddump-hi -ddump-to-file" Process exited with code: ExitFailure 1 $ git show commit 2fb2d11fffddde3c44920f7ea93e34b9d3195dad Author: Emanuel Borsboom <manny(a)fpcomplete.com> Date: Sun Nov 1 05:21:16 2015 -0800 <snip> }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11045> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #11499: Loading temp shared object failed in GHCi
by GHC 17 Apr '18

17 Apr '18

#11499: Loading temp shared object failed in GHCi --------------------------------------+------------------------------- Reporter: alfa07 | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 7.10.3 Keywords: | Operating System: MacOS X Architecture: x86_64 (amd64) | Type of failure: GHCi crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: --------------------------------------+------------------------------- While trying to launch ghci got the following error: ❯ stack ghci The following GHC options are incompatible with GHCi and have not been passed to it: -threaded -Odph Using main module: 1. Package `line-segment-intersection' component exe:demo with main-is file: /Users/maxim/Dev/ComputationGeometry/LineSegmentIntersection/app/Main.hs Configuring GHCi with the following packages: line-segment-intersection, GLUT, GLUtil, boundingboxes, freetype-simple, freetype2 GHCi, version 7.10.3: http://www.haskell.org/ghc/ :? for help ghc: panic! (the 'impossible' happened) (GHC version 7.10.3 for x86_64-apple-darwin): Loading temp shared object failed: dlopen(/var/folders/dz/lm9jncs90nq0vn_5j7xhpg2xqyfj66/T/ghc23900_0/libghc_25.dylib, 5): Symbol not found: _bdf_driver_class Referenced from: /var/folders/dz/lm9jncs90nq0vn_5j7xhpg2xqyfj66/T/ghc23900_0/libghc_25.dylib Expected in: flat namespace in /var/folders/dz/lm9jncs90nq0vn_5j7xhpg2xqyfj66/T/ghc23900_0/libghc_25.dylib Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11499> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #11117: mdo blocks in error messages are shown modified
by GHC 17 Apr '18

17 Apr '18

#11117: mdo blocks in error messages are shown modified -------------------------------------+------------------------------------- Reporter: nomeata | Owner: Type: bug | Status: new Priority: low | Milestone: Component: Compiler | Version: 7.8.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Incorrect Unknown/Multiple | warning at compile-time Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- {{{#!hs {-# LANGUAGE RecursiveDo #-} main = mdo Just x <- return (Right x) return () }}} gives {{{ MdoTypeError.hs:3:3: Couldn't match expected type ‘Either a0 b0’ with actual type ‘Maybe b0’ Relevant bindings include x :: b0 (bound at MdoTypeError.hs:3:8) In the pattern: Just x In a stmt of an 'mdo' block: Just x <- return (Right x) In a stmt of an 'mdo' block: rec { Just x <- return (Right x) } }}} Note that the error message mentions `rec` even though that is not what the user entered. In other instances, we are careful to show the code more similar to the original (e.g. `do`-notation instead of `>>=`). This should also be done here. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11117> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10920: ghci can't load local Prelude module
by GHC 14 Apr '18

14 Apr '18

#10920: ghci can't load local Prelude module -------------------------------------+------------------------------------- Reporter: Yuras | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 7.10.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | -------------------------------------+------------------------------------- I have a `Prelude.hs` file which contains {{{#!hs module Prelude where }}} If I invoke `ghci` from the same directory, I get {{{ Top level: attempting to use module ‘Prelude’ (./Prelude.hs) which is not loaded }}} Note: `ghc --make` correctly compiles modules that use the local `Prelude.hs`, so I expect `ghci` to handle that case too. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10920> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10631: Report of GHC Panic
by GHC 13 Apr '18

13 Apr '18

#10631: Report of GHC Panic -------------------------------------+------------------------------------- Reporter: seewalker | Owner: Type: bug | Status: new Priority: low | Milestone: Component: Compiler | Version: 7.10.1 Keywords: | Operating System: MacOS X Architecture: x86_64 | Type of failure: Compile-time (amd64) | crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Revisions: | -------------------------------------+------------------------------------- I'll just copy here the error message; I wouldn't say I have the judgement to interpret it: ''ghc: panic! (the 'impossible' happened) (GHC version 7.10.1 for x86_64-apple-darwin): Loading temp shared object failed: dlopen(/var/folders/84/5rj51n8x70g4km60lfh_ds1m0000gt/T/ghc22694_0/libghc22694_107.dylib, 5): Symbol not found: _AlexSzuELoZZpfyhWUk8IXGTl3Kiel_ModulesziDBTypes_zdfPersistFieldLinkTag_closure Referenced from: /var/folders/84/5rj51n8x70g4km60lfh_ds1m0000gt/T/ghc22694_0/libghc22694_107.dylib Expected in: flat namespace in /var/folders/84/5rj51n8x70g4km60lfh_ds1m0000gt/T/ghc22694_0/libghc22694_107.dylib Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug'' This occurred while interactively developing a website with "yesod devel". After the compiler crashed, I killed the program, invoked "yesod devel" again without changing anything in my source code. This next time, no error occurred. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10631> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9307: wave4main in nofib fails
by GHC 13 Apr '18

13 Apr '18

#9307: wave4main in nofib fails -------------------------------------+------------------------------------- Reporter: jrp | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: NoFib benchmark | Version: 7.8.3 suite | Operating System: MacOS X Keywords: wave4main | Type of failure: Incorrect result Architecture: x86_64 (amd64) | at runtime Difficulty: Unknown | Test Case: wave4main Blocked By: | Blocking: Related Tickets: | -------------------------------------+------------------------------------- Compiling HEAD with perf-llvm, (3.4.2) and running the nofib suite fails at the wave4main case. It is not clear to me whether wave4main should always produce the same output (and so the test fails because it does not do so) or whether the numbers generated depend on some feature of the build settings, or OS. {{{ HC = /Users/xxx/Projects/ghc/inplace/bin/ghc-stage2 HC_OPTS = -O2 -Rghc-timing -H32m -hisuf hi -cpp -fglasgow-exts -rtsopts RUNTEST_OPTS = -ghc-timing ==nofib== wave4main: size of wave4main follows... __TEXT __DATA __OBJC others dec hex 4091904 450560 0 4295947176 4300489640 1005443a8 ==nofib== wave4main: time to run wave4main follows... ../../../runstdtest/runstdtest ./wave4main -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -ghc-timing 4000; ../../../runstdtest/runstdtest ./wave4main -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -ghc-timing 4000; ../../../runstdtest/runstdtest ./wave4main -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -ghc-timing 4000; ../../../runstdtest/runstdtest ./wave4main -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -ghc-timing 4000; ../../../runstdtest/runstdtest ./wave4main -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -o1 wave4main.stdout -o1 wave4main.stdout2 -o1 wave4main.stdout3 -ghc-timing 4000; real 0m0.217s user 0m0.191s sys 0m0.011s ././wave4main 4000 < /dev/null expected stdout not matched by reality --- wave4main.stdout 2014-07-08 20:57:14.000000000 +0100 +++ /var/folders/d9/94xh7l810mz3_skcsfh68khh0000gn/T//runtest16932.1 2014-07-13 13:43:22.000000000 +0100 @@ -1 +1 @@ -69923/1465 +69096/1465 real 0m0.197s user 0m0.186s sys 0m0.008s ././wave4main 4000 < /dev/null expected stdout not matched by reality --- wave4main.stdout 2014-07-08 20:57:14.000000000 +0100 +++ /var/folders/d9/94xh7l810mz3_skcsfh68khh0000gn/T//runtest16961.1 2014-07-13 13:43:22.000000000 +0100 @@ -1 +1 @@ -69923/1465 +69096/1465 real 0m0.201s user 0m0.189s sys 0m0.009s ././wave4main 4000 < /dev/null expected stdout not matched by reality --- wave4main.stdout 2014-07-08 20:57:14.000000000 +0100 +++ /var/folders/d9/94xh7l810mz3_skcsfh68khh0000gn/T//runtest17011.1 2014-07-13 13:43:22.000000000 +0100 @@ -1 +1 @@ -69923/1465 +69096/1465 real 0m0.201s user 0m0.190s sys 0m0.008s ././wave4main 4000 < /dev/null expected stdout not matched by reality --- wave4main.stdout 2014-07-08 20:57:14.000000000 +0100 +++ /var/folders/d9/94xh7l810mz3_skcsfh68khh0000gn/T//runtest17051.1 2014-07-13 13:43:23.000000000 +0100 @@ -1 +1 @@ -69923/1465 +69096/1465 real 0m0.200s user 0m0.189s sys 0m0.009s ././wave4main 4000 < /dev/null expected stdout not matched by reality --- wave4main.stdout 2014-07-08 20:57:14.000000000 +0100 +++ /var/folders/d9/94xh7l810mz3_skcsfh68khh0000gn/T//runtest17080.1 2014-07-13 13:43:23.000000000 +0100 @@ -1 +1 @@ -69923/1465 +69096/1465 make: *** [runtests] Error 1 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9307> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10367: "ghc: panic! (the 'impossible' happened)"
by GHC 13 Apr '18

13 Apr '18

#10367: "ghc: panic! (the 'impossible' happened)" -------------------------------------+------------------------------------- Reporter: bgwines | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 Keywords: panic | Operating System: MacOS X Architecture: | Type of failure: Runtime crash Unknown/Multiple | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- When running tasty-hunit tests through `cabal repl`, I get the following error: {{{ ghc: panic! (the 'impossible' happened) (GHC version 7.8.3 for x86_64-apple-darwin): Loading temp shared object failed: dlopen(/var/folders/l6/v2vhn_3j6bb1yvp6k5sh2hv80000gp/T/ghc80357_0/ghc80357_61.dylib, 9): Symbol not found: __hpc_tickboxes_horsezmcontrolzm0zi1zi0zi0_HorseziCommands_hpc Referenced from: /var/folders/l6/v2vhn_3j6bb1yvp6k5sh2hv80000gp/T/ghc80357_0/ghc80357_61.dylib Expected in: flat namespace in /var/folders/l6/v2vhn_3j6bb1yvp6k5sh2hv80000gp/T/ghc80357_0/ghc80357_61.dylib Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} I have a hunch that it's because I enabled the following flags in my .cabal file, since I didn't get the exception before adding them: {{{ Test-Suite test-horse ... GHC-Options: -fhpc -hpcdir dist/hpc/horse-control-1.0 }}} When I run the tests via `cabal test`, I don't get the exception. I've created a branch that showcases the crash: https://github.com/bgwines /horse-control/tree/ghc-panic Repro steps: * clone repo * cd to repo * run `cabal repl` * run `:l Tests/test-horse.hs` * run `main` Reproducability: 100% Please feel free to contact me if there's information lacking, here! :) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10367> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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