August 2015 - ghc-tickets

[GHC] #10761: GHC panic when compiling vimus: failed to map segment from shared object
by GHC 31 Dec '15

31 Dec '15

#10761: GHC panic when compiling vimus: failed to map segment from shared object -------------------------------------+------------------------------------- Reporter: haasn | 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 Revisions: | -------------------------------------+------------------------------------- When trying to build https://github.com/vimus/vimus I get a GHC panic on a specific module: {{{ λ cabal build Building vimus-0.2.1... Preprocessing library vimus-0.2.1... [38 of 39] Compiling Vimus.Command ( src/Vimus/Command.hs, dist/build/Vimus/Command.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.10.2 for x86_64-unknown-linux): Loading temp shared object failed: /tmp/ghc17990_0/libghc_39.so: failed to map segment from shared object Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} I don't know why it's only this particular module of this particular library that fails. I'm running a kernel with GrSecurity and PaX enabled, and am using a hardened GCC toolchain (although Gentoo seems to automatically disable PIE for Haskell packages). -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10761> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10046: Linker script patch in rts/Linker.c doesn't work for (non-C or non-en..) locales
by GHC 30 Dec '15

30 Dec '15

#10046: Linker script patch in rts/Linker.c doesn't work for (non-C or non-en..) locales -------------------------------------+------------------------------------- Reporter: hgolden | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: 7.12.1 Component: Runtime | Version: 7.8.4 System | Operating System: Unknown/Multiple Keywords: linker | Type of failure: Incorrect result script | at runtime Architecture: | Blocked By: Unknown/Multiple | Related Tickets: 2615, 9237 Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Please see ticket:2615#comment:40 and replies. This error only occurs on systems where linker scripts are used. The linker script patch (as it has evolved) assumes that the error messages it will receive are in English. This would be true if the locale (LC_MESSAGES) is C or en (or one of the en variants). However, in other locales, the message will be in a different language. Unfortunately, the semantics of POSIX dlerror() specify that the error is returned as a pointer to a human-readable text string, rather than an error code. The string returned depends on the locale. The code could be made more robust by momentarily changing the locale (LC_MESSAGES) to C before calling dlerror() and reverting it to its previous value immediately after. This has been tested on a zh_CN.utf-8 (see ticket:2615#comment:42) and works. The only concern I have is in the case of multithreaded code that _might_ be affected if it is running while the locale is changed. I don't know enough to know if this is a real issue or not, nor do I know how to deal with it if necessary. Also see ticket:9237 for another corner case in the linker script code that should be dealt with at the same time. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10046> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9614: ghc --print-(gcc|ld)-linker-flags broken
by GHC 29 Dec '15

29 Dec '15

#9614: ghc --print-(gcc|ld)-linker-flags broken -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- {{{ rwbarton@morphism:~/ghc$ ghc --print-gcc-linker-flags ghc: panic! (the 'impossible' happened) (GHC version 7.8.3 for x86_64-unknown-linux): Setting not found: "Gcc Linker flags" Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug rwbarton@morphism:~/ghc$ ghc --print-ld-linker-flags ghc: panic! (the 'impossible' happened) (GHC version 7.8.3 for x86_64-unknown-linux): Setting not found: "Ld Linker flags" Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} In 2d2650bf65da3aede4e1c1ca4da623092b869dbe and subsequent commits (between 7.6 and 7.8) these settings fields became "C compiler link flags" and "ld flags". (I think, more or less.) The real problem is that Cabal still looks for the settings fields "Gcc Linker flags" and "Ld Linker flags". I guess this should be updated on the Cabal side though. (They are empty on at least Linux x86_64, which I guess is why nobody noticed before.) -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9614> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9414: GHC 7.8.3 compilation fails on Raspberry PI
by GHC 27 Dec '15

27 Dec '15

#9414: GHC 7.8.3 compilation fails on Raspberry PI ----------------------------+--------------------------------------- Reporter: ipuustin | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Keywords: | Operating System: Linux Architecture: arm | Type of failure: None/Unknown Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: ----------------------------+--------------------------------------- Tried to compile GHC 7.8.3 from the source package on Raspbian (a Debian- based Raspberry PI distribution). The installed GHC version is 7.4.1. All build dependencies for 7.4.1 were installed ('apt-get build-dep ghc'). {{{ "inplace/bin/ghc-stage1" -o utils/dll-split/dist-install/build/tmp/dll- split -hisuf dyn_hi -osuf dyn_o -hcsuf dyn_hc -fPIC -dynamic -H32m -O -hide-all-packages -i -iutils/dll-split/. -iutils/dll-split/dist- install/build -iutils/dll-split/dist-install/build/autogen -Iutils/dll- split/dist-install/build -Iutils/dll-split/dist-install/build/autogen -optP-include -optPutils/dll-split/dist- install/build/autogen/cabal_macros.h -package base-4.7.0.1 -package containers-0.5.5.1 -package filepath-1.3.0.2 -XHaskell98 -no-user- package-db -rtsopts -odir utils/dll-split/dist-install/build -hidir utils/dll-split/dist-install/build -stubdir utils/dll-split/dist- install/build -optl-L'/home/pi/ghc/ghc-7.8.3/libraries/filepath/dist- install/build' -optl-L'/home/pi/ghc/ghc-7.8.3/libraries/containers/dist- install/build' -optl-L'/home/pi/ghc/ghc-7.8.3/libraries/deepseq/dist- install/build' -optl-L'/home/pi/ghc/ghc-7.8.3/libraries/array/dist- install/build' -optl-L'/home/pi/ghc/ghc-7.8.3/libraries/base/dist- install/build' -optl-L'/home/pi/ghc/ghc-7.8.3/libraries/integer-gmp/dist- install/build' -optl-L'/home/pi/ghc/ghc-7.8.3/libraries/ghc-prim/dist- install/build' -optl-L'/home/pi/ghc/ghc-7.8.3/rts/dist/build' -optl-lgmp -optl-lm -optl-lrt -optl-ldl -fPIC -dynamic -H32m -O -hide-all- packages -i -iutils/dll-split/. -iutils/dll-split/dist-install/build -iutils/dll-split/dist-install/build/autogen -Iutils/dll-split/dist- install/build -Iutils/dll-split/dist-install/build/autogen -optP- include -optPutils/dll-split/dist-install/build/autogen/cabal_macros.h -package base-4.7.0.1 -package containers-0.5.5.1 -package filepath-1.3.0.2 -XHaskell98 -no-user-package-db -rtsopts -fno-use- rpaths -optl-Wl,-rpath -optl-Wl,'$ORIGIN/../filepath-1.3.0.2' -optl- Wl,-rpath -optl-Wl,'$ORIGIN/../containers-0.5.5.1' -optl-Wl,-rpath -optl- Wl,'$ORIGIN/../deepseq-1.3.0.2' -optl-Wl,-rpath -optl- Wl,'$ORIGIN/../array-0.5.0.0' -optl-Wl,-rpath -optl- Wl,'$ORIGIN/../base-4.7.0.1' -optl-Wl,-rpath -optl-Wl,'$ORIGIN/../integer- gmp-0.5.1.0' -optl-Wl,-rpath -optl-Wl,'$ORIGIN/../ghc-prim-0.3.1.0' -optl- Wl,-rpath -optl-Wl,'$ORIGIN/../rts-1.0' -optl-Wl,-zorigin utils/dll-split /dist-install/build/Main.dyn_o "cp" -p utils/dll-split/dist-install/build/tmp/dll-split inplace/lib/bin /dll-split "rm" -f inplace/bin /dll-split echo '#!/bin/bash' >> inplace/bin/dll-split echo 'executablename="/home/pi/ghc/ghc-7.8.3/inplace/lib/bin/dll-split"' >> inplace/bin/dll-split echo 'datadir="/home/pi/ghc/ghc-7.8.3/inplace/lib"' >> inplace/bin/dll-split echo 'bindir="/home/pi/ghc/ghc-7.8.3/inplace/bin"' >> inplace/bin/dll-split echo 'topdir="/home/pi/ghc/ghc-7.8.3/inplace/lib"' >> inplace/bin/dll-split echo 'pgmgcc="/usr/bin/gcc"' >> inplace/bin/dll-split echo 'export LD_LIBRARY_PATH="/home/pi/ghc/ghc-7.8.3/libraries/filepath /dist-install/build:/home/pi/ghc/ghc-7.8.3/libraries/containers/dist- install/build:/home/pi/ghc/ghc-7.8.3/libraries/deepseq/dist- install/build:/home/pi/ghc/ghc-7.8.3/libraries/array/dist- install/build:/home/pi/ghc/ghc-7.8.3/libraries/base/dist- install/build:/home/pi/ghc/ghc-7.8.3/libraries/integer-gmp/dist- install/build:/home/pi/ghc/ghc-7.8.3/libraries/ghc-prim/dist- install/build:/home/pi/ghc/ghc-7.8.3/rts/dist/build:$LD_LIBRARY_PATH"' >> inplace/bin/dll-split echo 'exec "$executablename" ${1+"$@"}' >> inplace/bin /dll-split chmod +x inplace/bin /dll-split inplace/bin/dll-split compiler/stage2/build/.depend-v-p-dyn.haskell "DynFlags" "Annotations Avail Bag BasicTypes BinIface Binary Bitmap BlockId BooleanFormula BreakArray BufWrite BuildTyCl ByteCodeAsm ByteCodeInstr ByteCodeItbls CLabel Class CmdLineParser Cmm CmmCallConv CmmExpr CmmInfo CmmMachOp CmmNode CmmType CmmUtils CoAxiom ConLike CodeGen.Platform CodeGen.Platform.ARM CodeGen.Platform.NoRegs CodeGen.Platform.PPC CodeGen.Platform.PPC_Darwin CodeGen.Platform.SPARC CodeGen.Platform.X86 CodeGen.Platform.X86_64 Coercion Config Constants CoreArity CoreFVs CoreLint CoreSubst CoreSyn CoreTidy CoreUnfold CoreUtils CostCentre DataCon Demand Digraph DriverPhases DsMonad DynFlags Encoding ErrUtils Exception ExtsCompat46 FamInstEnv FastBool FastFunctions FastMutInt FastString FastTypes Finder Fingerprint FiniteMap ForeignCall Hooks Hoopl Hoopl.Dataflow HsBinds HsDecls HsDoc HsExpr HsImpExp HsLit HsPat HsSyn HsTypes HsUtils HscTypes IOEnv Id IdInfo IfaceEnv IfaceSyn IfaceType InstEnv InteractiveEvalTypes Kind ListSetOps Literal LoadIface Maybes MkCore MkGraph MkId Module MonadUtils Name NameEnv NameSet OccName OccurAnal OptCoercion OrdList Outputable PackageConfig Packages Pair Panic PatSyn PipelineMonad Platform PlatformConstants PprCmm PprCmmDecl PprCmmExpr PprCore PrelInfo PrelNames PrelRules Pretty PrimOp RdrName Reg RegClass Rules SMRep Serialized SrcLoc StaticFlags StgCmmArgRep StgCmmClosure StgCmmEnv StgCmmLayout StgCmmMonad StgCmmProf StgCmmTicky StgCmmUtils StgSyn Stream StringBuffer TcEvidence TcIface TcRnMonad TcRnTypes TcType TcTypeNats TrieMap TyCon Type TypeRep TysPrim TysWiredIn Unify UniqFM UniqSet UniqSupply Unique Util Var VarEnv VarSet" dll-split: internal error: evacuate(static): strange closure type 0 (GHC version 7.8.3 for arm_unknown_linux) Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug make[1]: *** [compiler/stage2/dll-split.stamp] Keskeytetty make: *** [all] Virhe 2 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9414> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10376: arm/linux linking failure
by GHC 27 Dec '15

27 Dec '15

#10376: arm/linux linking failure -------------------------------------+------------------------------------- Reporter: erikd | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.12.1 Component: Compiler | Version: 7.11 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Other Unknown/Multiple | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Tests `sigcabal01` and `sigcabal02` both fail with an error like: {{{ /usr/bin/ld.gold: warning: cannot scan executable section 1 of \ /home/erikd/ghc-upstream/testsuite/tests/cabal/sigcabal01/inst-p/lib/\ arm-linux-ghc-7.11.20150501/p_F3lh2Js8iHV9qItpHBsq0d/\ libHSp-1.0-F3lh2Js8iHV9qItpHBsq0d.a(P.o) for Cortex-A8 erratum because it has no mapping symbols. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10376> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10589: Core Lint error with LambdaCase
by GHC 26 Dec '15

26 Dec '15

#10589: Core Lint error with LambdaCase -------------------------------------+------------------------------------- Reporter: goldfire | Owner: goldfire Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 (Type checker) | Operating System: Unknown/Multiple Keywords: | Type of failure: None/Unknown Architecture: | Blocked By: Unknown/Multiple | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- When I say {{{ {-# LANGUAGE LambdaCase, TypeFamilies #-} type family F a where F a = Bool -> a foo = (\case True -> 5 False -> 6) :: F Int }}} `-dcore-lint` tells me {{{ *** Core Lint errors : in result of Desugar (after optimization) *** /Users/rae/temp/Bug.hs:6:1: Warning: [RHS of foo :: Bool -> Int] From-type of Cast differs from type of enclosed expression ... }}} The problem is a missing `mkTcSymCo` in the relevant bit of `tcExpr`. Will fix in ongoing work. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10589> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9176: GHC not generating dyn_hi files
by GHC 25 Dec '15

25 Dec '15

#9176: GHC not generating dyn_hi files ----------------------------------+---------------------------- Reporter: heatsink | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.9 Keywords: dynamic | Operating System: MacOS X Architecture: x86_64 (amd64) | Type of failure: Other Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ----------------------------------+---------------------------- In some situations, GHC terminates successfully and generates a `dyn_o` file, but no `dyn_hi` file. As a result, a package that contains a library seems to build successfully, but fails to install. I narrowed the problem down to the following test case. I compile it with `ghc --make -shared -dynamic-too Foo`. It seems to be Parsec-related, but I don't know how to trace it further. {{{ module Foo where import Text.ParserCombinators.Parsec }}} Parsec was installed with `cabal install --reinstall --user --enable- shared --disable-library-profiling parsec-3.1.5`. Some Parsec modules do not cause the missing `dyn_hi` file. For instance, all output files are created if Foo imports `Text.Parsec.Pos` instead of `Text.ParserCombinators.Parsec`. GHC was built from source, commit 9e10963e394680dbb1b964c66cb428a2aa03df09, compiled by GHC 7.6.3 with XCode 5.1.1 on OS X 10.9.3. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9176> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9760: ghc -c 7.8 drops last char of file name if -osuf contains a dot
by GHC 24 Dec '15

24 Dec '15

#9760: ghc -c 7.8 drops last char of file name if -osuf contains a dot -------------------------------------+------------------------------------- Reporter: nh2 | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.8.4 Component: Build System | Version: 7.8.3 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Moderate (less | Type of failure: than a day) | None/Unknown Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- I discovered that if I compile with `ghc -c -osuf .something Myfile.hs` where `Myfile.hs` contains TH and thus has to dynamically link in, say, `Other.hs`, I get the error that {{{ Myfile.hs:1:1: cannot find normal object file 'Othe.dyn_o` while linking an interpreted expression }}} So `Other` was wrongly made into `Othe`, dropping the last character. If I don't pass `-osuf .something`, or have it not have a dot, everything's fine. The trouble is that `-osuf .something` worked fine in GHC <= 7.6. So I believe this is a regression, or at least a very bad error message. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9760> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #9975: RecordWildCards and PatternSynonyms cause impossible bug
by GHC 24 Dec '15

24 Dec '15

#9975: RecordWildCards and PatternSynonyms cause impossible bug -------------------------------------+------------------------------------- Reporter: gamegoblin | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.4 Keywords: | Operating System: MacOS X RecordWildCards PatternSynonyms | Type of failure: Compile-time Architecture: x86_64 | crash (amd64) | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- When using RecordWildCards with PatternSynonyms, I have found a way to cause this bug: $ /usr/local/bin/ghc-7.10.0.20141222 test.hs [1 of 1] Compiling Main ( test.hs, test.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.10.0.20141222 for x86_64-apple-darwin): find_tycon Test [Test defined at test.hs:6:9, Test parent:Test defined at test.hs:4:13] Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug Here is the full code that causes it: {{{#!hs {-# LANGUAGE RecordWildCards #-} {-# LANGUAGE PatternSynonyms #-} data Test = Test { x :: Int } pattern Test wat = Test { x = wat } }}} If you remove RecordWildCards, the bug does not happen. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9975> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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[GHC] #10404: GHC panic when creating a monomorphised pattern synonym for GADT
by GHC 23 Dec '15

23 Dec '15

#10404: GHC panic when creating a monomorphised pattern synonym for GADT -------------------------------------+------------------------------------- Reporter: | Owner: Iceland_jack | Status: new Type: bug | Milestone: Priority: normal | Version: 7.10.1-rc1 Component: Compiler | Operating System: Linux Keywords: | Type of failure: GHC rejects Architecture: x86 | valid program Test Case: | Blocked By: Blocking: | Related Tickets: Differential Revisions: | -------------------------------------+------------------------------------- I have an expression {{{#!hs {-# LANGUAGE GADTs #-} {-# LANGUAGE PatternSynonyms #-} data Exp a where Fun :: (a -> b) - (Exp a -> Exp b) }}} and I want to create a pattern synonym for Int-expressions: {{{#!hs -- This works: -- pattern :: (a -> b) -> (Exp a -> Exp b) -- pattern IntFun f x = Fun f x pattern :: (Int -> Int) -> (Exp Int -> Exp Int) pattern IntFun f x = Fun f x }}} which results in {{{#!hs % ghci -ignore-dot-ghci Panic.hs GHCi, version 7.10.0.20150316: http://www.haskell.org/ghc/ :? for help [1 of 1] Compiling Main ( Panic.hs, interpreted ) Panic.hs:8:28: Couldn't match type ‘a’ with ‘Int’ ‘a’ is a rigid type variable bound by a pattern with constructor Fun :: forall b a. (a -> b) -> Exp a -> Exp b, in a pattern synonym declaration at Panic.hs:8:22 Expected type: Int -> Int Actual type: a -> Int Relevant bindings include b :: Exp a (bound at Panic.hs:8:28) a :: a -> Int (bound at Panic.hs:8:26) Failed, modules loaded: none. }}} So I try to be sneaky: {{{#!hs pattern :: (a ~ Int) => (a -> b) -> (Exp a -> Exp b) pattern IntFun f x = Fun f x -- % ghci -ignore-dot-ghci Panic.hs -- … -- Couldn't match type ‘a’ with ‘Int’ -- ‘a’ is a rigid type variable bound by -- the type signature for IntFun :: (a1 -> b) -> Exp a1 -> Exp b -- at Panic.hs:8:22 }}} and if I constrain both type variables it panics {{{#!hs pattern :: (a ~ Int, b ~ Int) => (a -> b) -> (Exp a -> Exp b) pattern IntFun f x = Fun f x -- Couldn't match type ‘b’ with ‘Int’ -- ‘b’ is untouchable -- inside the constraints () -- bound by the type signature for -- IntFun :: (a1 -> b) -> Exp a1 -> Exp b -- at Panic.hs:8:9-14ghc: panic! (the 'impossible' happened) -- (GHC version 7.10.0.20150316 for i386-unknown-linux): -- No skolem info: b_alF[sk] -- -- Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} The final version should look like: {{{#!hs type Name = String data Exp a where Fun :: Name -> (a -> b) -> (Exp a -> Exp b) ... pattern Suc :: Exp Int -> Exp Int pattern Suc n <- Fun _ _ n where Suc n = Fun "suc" (+ 1) n }}} Shouldn't this work? -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10404> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler

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