#10279: panic on haskell-src-exts -------------------------------------+------------------------------------- Reporter: throwaway123 | Owner: ezyang Type: bug | Status: closed Priority: normal | Milestone: 8.0.1 Component: Template Haskell | Version: 7.10.1 Resolution: wontfix | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1342 Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: patch => closed * resolution: => wontfix Old description:
Compiling `Bug.hs`:
{{{ {-# LANGUAGE QuasiQuotes #-}
import Language.Haskell.Exts.QQ (dec)
main :: IO () main = return () where foo = [dec| bar = 3 |] }}} by `ghc --make -v -dcore-lint Bug.hs` gives {{{ ghc --make -v -dcore-lint Bug.hs Glasgow Haskell Compiler, Version 7.10.1, stage 2 booted by GHC version 7.8.4 Using binary package database: /usr/lib/ghc-7.10.1/package.conf.d/package.cache wired-in package ghc-prim mapped to ghc- prim-0.4.0.0-7c945cc0c41d3b7b70f3edd125671166 wired-in package integer-gmp mapped to integer- gmp-1.0.0.0-3c947e5fb6dca14804d9b2793c521b67 wired-in package base mapped to base-4.8.0.0-1b689eb8d72c4d4cc88f445839c1f01a wired-in package rts mapped to builtin_rts wired-in package template-haskell mapped to template- haskell-2.10.0.0-e895139a0ffff267d412e3d0191ce93b wired-in package ghc mapped to ghc-7.10.1-325809317787a897b7a97d646ceaa3a3 wired-in package dph-seq not found. wired-in package dph-par not found. Hsc static flags: wired-in package ghc-prim mapped to ghc- prim-0.4.0.0-7c945cc0c41d3b7b70f3edd125671166 wired-in package integer-gmp mapped to integer- gmp-1.0.0.0-3c947e5fb6dca14804d9b2793c521b67 wired-in package base mapped to base-4.8.0.0-1b689eb8d72c4d4cc88f445839c1f01a wired-in package rts mapped to builtin_rts wired-in package template-haskell mapped to template- haskell-2.10.0.0-e895139a0ffff267d412e3d0191ce93b wired-in package ghc mapped to ghc-7.10.1-325809317787a897b7a97d646ceaa3a3 wired-in package dph-seq not found. wired-in package dph-par not found. *** Chasing dependencies: Chasing modules from: *Bug.hs Stable obj: [] Stable BCO: [] Ready for upsweep [NONREC ModSummary { ms_hs_date = 2015-04-09 10:01:43.312180074 UTC ms_mod = Main, ms_textual_imps = [import (implicit) Prelude, import Language.Haskell.Exts.QQ ( dec )] ms_srcimps = [] }] *** Deleting temp files: Deleting: compile: input file Bug.hs Created temporary directory: /tmp/ghc7356_0 *** Checking old interface for Main: [1 of 1] Compiling Main ( Bug.hs, Bug.o ) *** Parser: *** Renamer/typechecker: *** Simplify: *** CorePrep: *** ByteCodeGen: Loading package ghc-prim-0.4.0.0 ... linking ... done. *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/usr/lib/ghc-7.10.1/integ_2aU3IZNMF9a7mQ0OzsZ0dS --print-file-name libgmp.so Loading package integer-gmp-1.0.0.0 ... linking ... done. Loading package base-4.8.0.0 ... linking ... done. Loading package array-0.5.1.0 ... linking ... done. Loading package filepath-1.4.0.0 ... linking ... done. Loading package deepseq-1.4.1.1 ... linking ... done. Loading package time-1.5.0.1 ... linking ... done. Loading package bytestring-0.10.6.0 ... linking ... done. *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/usr/lib/ghc-7.10.1/unix_G4Yo1pNtYrk8nCq1cx8P9d --print-file-name librt.so *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/usr/lib/ghc-7.10.1/unix_G4Yo1pNtYrk8nCq1cx8P9d --print-file-name libutil.so *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/usr/lib/ghc-7.10.1/unix_G4Yo1pNtYrk8nCq1cx8P9d --print-file-name libdl.so *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/usr/lib/ghc-7.10.1/unix_G4Yo1pNtYrk8nCq1cx8P9d --print-file-name libpthread.so Loading package unix-2.7.1.0 ... linking ... done. Loading package directory-1.2.2.0 ... linking ... done. Loading package old-locale-1.0.0.7 ... linking ... done. Loading package old-time-1.1.0.3 ... linking ... done. Loading package text-1.2.0.4 ... linking ... done. Loading package polyparse-1.11 ... linking ... done. Loading package cpphs-1.19 ... linking ... done. Loading package pretty-1.1.2.0 ... linking ... done. Loading package haskell-src-exts-1.16.0.1 ... linking ... done. Loading package syb-0.4.4 ... linking ... done. Loading package template-haskell-2.10.0.0 ... linking ... done. Loading package transformers-0.4.2.0 ... linking ... done. Loading package mtl-2.2.1 ... linking ... done. Loading package nats-1 ... linking ... done. Loading package th-lift-0.7.2 ... linking ... done. Loading package containers-0.5.6.2 ... linking ... done. Loading package safe-0.3.8 ... linking ... done. Loading package th-expand-syns-0.3.0.6 ... linking ... done. Loading package th-reify-many-0.1.3 ... linking ... done. Loading package th-orphans-0.11.1 ... linking ... done. Loading package haskell-src-meta-0.6.0.9 ... linking ... done. Loading package haskell-src-exts-qq-0.6.1 ... linking ... done.
Bug.hs:8:16:*** Deleting temp files: Deleting: /tmp/ghc7356_0/ghc7356_1.s Warning: deleting non-existent /tmp/ghc7356_0/ghc7356_1.s *** Deleting temp dirs: Deleting: /tmp/ghc7356_0 ghc: panic! (the 'impossible' happened) (GHC version 7.10.1 for x86_64-unknown-linux): qual_pkg haskell-src-exts-1.16.0.1
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} on my machine: {{{ $ uname -a Linux io 3.19.3-1-ARCH #1 SMP PREEMPT Thu Mar 26 14:56:16 CET 2015 x86_64 GNU/Linux
$ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/lto- wrapper Target: x86_64-unknown-linux-gnu Configured with: /build/gcc/src/gcc-4.9-20150304/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared --enable-threads=posix --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx- pch --disable-libssp --enable-gnu-unique-object --enable-linker-build-id --enable-cloog-backend=isl --enable-lto --enable-plugin --enable-install- libiberty --with-linker-hash-style=gnu --disable-multilib --disable- werror --enable-checking=release Thread model: posix gcc version 4.9.2 20150304 (prerelease) (GCC)
$ ghc-pkg list /usr/lib/ghc-7.10.1/package.conf.d Cabal-1.22.2.0 array-0.5.1.0 async-2.0.2 base-4.8.0.0 bin-package-db-0.0.0.0 binary-0.7.3.0 bytestring-0.10.6.0 containers-0.5.6.2 cpphs-1.19 deepseq-1.4.1.1 directory-1.2.2.0 filepath-1.4.0.0 ghc-7.10.1 ghc-paths-0.1.0.9 ghc-prim-0.4.0.0 haddock-api-2.16.0 haddock-library-1.2.0 haskeline-0.7.2.1 haskell-src-exts-1.16.0.1 haskell-src-exts-qq-0.6.1 haskell-src-meta-0.6.0.9 hoopl-3.10.0.2 hpc-0.6.0.2 integer-gmp-1.0.0.0 minisat-0.1.1 mtl-2.2.1 nats-1 old-locale-1.0.0.7 old-time-1.1.0.3 polyparse-1.11 pretty-1.1.2.0 process-1.2.3.0 rts-1.0 safe-0.3.8 satchmo-core-0.8.0 stm-2.4.4 syb-0.4.4 template-haskell-2.10.0.0 terminfo-0.4.0.1 text-1.2.0.4 th-expand-syns-0.3.0.6 th-lift-0.7.2 th-orphans-0.11.1 th-reify-many-0.1.3 time-1.5.0.1 transformers-0.4.2.0 unix-2.7.1.0 xhtml-3000.2.1 }}}
I realized while thinking about this today that this new API is not a solution to `NameG` problems caused by new `UnitId` business, because query functions like `reifyPackage` are running in `Q`, so running TH is needed for these functions.
But the whole point of using `NameG` instead of generating names using quotations was to avoid running TH.
So this API doesn't solve the problem.
We were chatting with @ezyang on IRC and he showed me two things:
1. Cabal now has a macro `CURRENT_PACKAGE_KEY` which will keep things working even when `NameG` is used. (it only helps if we refer to the current package of course, but that's enough for most of the use cases)
2. With next major release we'll have this: https://git.haskell.org/ghc.git/commitdiff/f16ddcee0c64a92ab911a7841a8cf64e3... which will solve all the problems caused by `NameG` and `UnitIds`.
Long story short, this patch is not needed. What we need is to document
New description: Compiling `Bug.hs`: {{{#!hs {-# LANGUAGE QuasiQuotes #-} import Language.Haskell.Exts.QQ (dec) main :: IO () main = return () where foo = [dec| bar = 3 |] }}} by `ghc --make -v -dcore-lint Bug.hs` gives {{{ ghc --make -v -dcore-lint Bug.hs Glasgow Haskell Compiler, Version 7.10.1, stage 2 booted by GHC version 7.8.4 Using binary package database: /usr/lib/ghc-7.10.1/package.conf.d/package.cache wired-in package ghc-prim mapped to ghc- prim-0.4.0.0-7c945cc0c41d3b7b70f3edd125671166 wired-in package integer-gmp mapped to integer- gmp-1.0.0.0-3c947e5fb6dca14804d9b2793c521b67 wired-in package base mapped to base-4.8.0.0-1b689eb8d72c4d4cc88f445839c1f01a wired-in package rts mapped to builtin_rts wired-in package template-haskell mapped to template- haskell-2.10.0.0-e895139a0ffff267d412e3d0191ce93b wired-in package ghc mapped to ghc-7.10.1-325809317787a897b7a97d646ceaa3a3 wired-in package dph-seq not found. wired-in package dph-par not found. Hsc static flags: wired-in package ghc-prim mapped to ghc- prim-0.4.0.0-7c945cc0c41d3b7b70f3edd125671166 wired-in package integer-gmp mapped to integer- gmp-1.0.0.0-3c947e5fb6dca14804d9b2793c521b67 wired-in package base mapped to base-4.8.0.0-1b689eb8d72c4d4cc88f445839c1f01a wired-in package rts mapped to builtin_rts wired-in package template-haskell mapped to template- haskell-2.10.0.0-e895139a0ffff267d412e3d0191ce93b wired-in package ghc mapped to ghc-7.10.1-325809317787a897b7a97d646ceaa3a3 wired-in package dph-seq not found. wired-in package dph-par not found. *** Chasing dependencies: Chasing modules from: *Bug.hs Stable obj: [] Stable BCO: [] Ready for upsweep [NONREC ModSummary { ms_hs_date = 2015-04-09 10:01:43.312180074 UTC ms_mod = Main, ms_textual_imps = [import (implicit) Prelude, import Language.Haskell.Exts.QQ ( dec )] ms_srcimps = [] }] *** Deleting temp files: Deleting: compile: input file Bug.hs Created temporary directory: /tmp/ghc7356_0 *** Checking old interface for Main: [1 of 1] Compiling Main ( Bug.hs, Bug.o ) *** Parser: *** Renamer/typechecker: *** Simplify: *** CorePrep: *** ByteCodeGen: Loading package ghc-prim-0.4.0.0 ... linking ... done. *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/usr/lib/ghc-7.10.1/integ_2aU3IZNMF9a7mQ0OzsZ0dS --print-file-name libgmp.so Loading package integer-gmp-1.0.0.0 ... linking ... done. Loading package base-4.8.0.0 ... linking ... done. Loading package array-0.5.1.0 ... linking ... done. Loading package filepath-1.4.0.0 ... linking ... done. Loading package deepseq-1.4.1.1 ... linking ... done. Loading package time-1.5.0.1 ... linking ... done. Loading package bytestring-0.10.6.0 ... linking ... done. *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/usr/lib/ghc-7.10.1/unix_G4Yo1pNtYrk8nCq1cx8P9d --print-file-name librt.so *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/usr/lib/ghc-7.10.1/unix_G4Yo1pNtYrk8nCq1cx8P9d --print-file-name libutil.so *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/usr/lib/ghc-7.10.1/unix_G4Yo1pNtYrk8nCq1cx8P9d --print-file-name libdl.so *** gcc: /usr/bin/gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE -L/usr/lib/ghc-7.10.1/unix_G4Yo1pNtYrk8nCq1cx8P9d --print-file-name libpthread.so Loading package unix-2.7.1.0 ... linking ... done. Loading package directory-1.2.2.0 ... linking ... done. Loading package old-locale-1.0.0.7 ... linking ... done. Loading package old-time-1.1.0.3 ... linking ... done. Loading package text-1.2.0.4 ... linking ... done. Loading package polyparse-1.11 ... linking ... done. Loading package cpphs-1.19 ... linking ... done. Loading package pretty-1.1.2.0 ... linking ... done. Loading package haskell-src-exts-1.16.0.1 ... linking ... done. Loading package syb-0.4.4 ... linking ... done. Loading package template-haskell-2.10.0.0 ... linking ... done. Loading package transformers-0.4.2.0 ... linking ... done. Loading package mtl-2.2.1 ... linking ... done. Loading package nats-1 ... linking ... done. Loading package th-lift-0.7.2 ... linking ... done. Loading package containers-0.5.6.2 ... linking ... done. Loading package safe-0.3.8 ... linking ... done. Loading package th-expand-syns-0.3.0.6 ... linking ... done. Loading package th-reify-many-0.1.3 ... linking ... done. Loading package th-orphans-0.11.1 ... linking ... done. Loading package haskell-src-meta-0.6.0.9 ... linking ... done. Loading package haskell-src-exts-qq-0.6.1 ... linking ... done. Bug.hs:8:16:*** Deleting temp files: Deleting: /tmp/ghc7356_0/ghc7356_1.s Warning: deleting non-existent /tmp/ghc7356_0/ghc7356_1.s *** Deleting temp dirs: Deleting: /tmp/ghc7356_0 ghc: panic! (the 'impossible' happened) (GHC version 7.10.1 for x86_64-unknown-linux): qual_pkg haskell-src-exts-1.16.0.1 Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} on my machine: {{{ $ uname -a Linux io 3.19.3-1-ARCH #1 SMP PREEMPT Thu Mar 26 14:56:16 CET 2015 x86_64 GNU/Linux $ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.2/lto- wrapper Target: x86_64-unknown-linux-gnu Configured with: /build/gcc/src/gcc-4.9-20150304/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared --enable-threads=posix --with-system-zlib --enable-__cxa_atexit --disable- libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object --enable-linker-build-id --enable-cloog-backend=isl --enable-lto --enable-plugin --enable-install- libiberty --with-linker-hash-style=gnu --disable-multilib --disable-werror --enable-checking=release Thread model: posix gcc version 4.9.2 20150304 (prerelease) (GCC) $ ghc-pkg list /usr/lib/ghc-7.10.1/package.conf.d Cabal-1.22.2.0 array-0.5.1.0 async-2.0.2 base-4.8.0.0 bin-package-db-0.0.0.0 binary-0.7.3.0 bytestring-0.10.6.0 containers-0.5.6.2 cpphs-1.19 deepseq-1.4.1.1 directory-1.2.2.0 filepath-1.4.0.0 ghc-7.10.1 ghc-paths-0.1.0.9 ghc-prim-0.4.0.0 haddock-api-2.16.0 haddock-library-1.2.0 haskeline-0.7.2.1 haskell-src-exts-1.16.0.1 haskell-src-exts-qq-0.6.1 haskell-src-meta-0.6.0.9 hoopl-3.10.0.2 hpc-0.6.0.2 integer-gmp-1.0.0.0 minisat-0.1.1 mtl-2.2.1 nats-1 old-locale-1.0.0.7 old-time-1.1.0.3 polyparse-1.11 pretty-1.1.2.0 process-1.2.3.0 rts-1.0 safe-0.3.8 satchmo-core-0.8.0 stm-2.4.4 syb-0.4.4 template-haskell-2.10.0.0 terminfo-0.4.0.1 text-1.2.0.4 th-expand-syns-0.3.0.6 th-lift-0.7.2 th-orphans-0.11.1 th-reify-many-0.1.3 time-1.5.0.1 transformers-0.4.2.0 unix-2.7.1.0 xhtml-3000.2.1 }}} -- Comment: Sadly it appears there isn't any good fix here. Instead, we must simply document our way around the problem. To quote osa1 on Phab:D1342, things. And also `template-haskell` package needs some cleaning. For example, we can hide `Name` stuff. We can move some types that are used by TH generated code to an internal module to prevent users from using them. For example, why `mkNameG_v` even in `Language.Haskell.TH.Syntax`? It's not documented, it's not supposed to be used by users. The whole package is a mess.
Oh, also, the package database I'm using in this patch is not the
database I should be using. Because such a database doesn't even exist. I actually asked about this here: https://phabricator.haskell.org/D1342#38429 and got this answer: https://phabricator.haskell.org/D1342#38441 which was misleading. Consequently I'll be closing this as wontfix. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10279#comment:38 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler