#14675: GHC 8.4.1 regression: segfault when loading doctest on a module with ANNs on Ubuntu 16.04 or later -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: alpmestan Type: bug | Status: new Priority: highest | Milestone: 8.4.1 Component: GHC API | Version: 8.4.1-alpha1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: #14603 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by alpmestan): Alright, I did another build, `perf` flavour instead of `quick` previously, using `./configure --with-ghc=/opt/ghc/8.2.2/bin/ghc --prefix=/opt/ghc/my-8.4.1/bin/ghc --enable-dwarf-unwind` along with `GhcLibHcOpts += -g3` and `GhcRtsHcOpts += -g3`, so that I can use gdb to figure out where exactly things are going wrong, if I can reproduce the crash. Also from the same commit as hvr's build: {{{#!haskell alp@vm:~/14675$ /home/alp/ghc/inplace/bin/ghc-stage2 --info | grep commit ,("Project Git commit id","c6cf13ca63f3a11a8da7c7e3bd69e673a8df5440") alp@vm:~/14675$ /opt/ghc/8.4.1/bin/ghc --info | grep commit ,("Project Git commit id","c6cf13ca63f3a11a8da7c7e3bd69e673a8df5440") }}} And with this precise setup, even though for some reason I can't `make install` this build, I can reproduce the problem. {{{#!bash alp@vm:~/14675$ /home/alp/ghc/inplace/bin/ghc-stage2 -fforce-recomp -package ghc Bug.hs [1 of 1] Compiling Main ( Bug.hs, Bug.o ) Linking Bug ... alp@vm:~/14675$ PATH=/home/alp/ghc/inplace/bin:$PATH ./Bug /home/alp/ghc/inplace/lib Using binary package database: /home/alp/ghc/inplace/lib/package.conf.d/package.cache package flags [-package base{package base True ([])}] loading package database /home/alp/ghc/inplace/lib/package.conf.d wired-in package ghc-prim mapped to ghc-prim-0.5.2.0 wired-in package integer-gmp mapped to integer-gmp-1.0.1.0 wired-in package base mapped to base-4.11.0.0 wired-in package rts mapped to rts wired-in package template-haskell mapped to template-haskell-2.13.0.0 wired-in package ghc mapped to ghc-8.4.0.20171222 wired-in package dph-seq not found. wired-in package dph-par not found. *** Chasing dependencies: Chasing modules from: *Foo.hs !!! Chasing dependencies: finished in 0.96 milliseconds, allocated 0.400 megabytes Before parseModule *** Parser [Foo]: !!! Parser [Foo]: finished in 0.08 milliseconds, allocated 0.070 megabytes Before typecheckModule *** Renamer/typechecker [Foo]: *** Simplify [expr]: !!! Simplify [expr]: finished in 0.07 milliseconds, allocated 0.000 megabytes *** CorePrep [expr]: !!! CorePrep [expr]: finished in 1.37 milliseconds, allocated 1.666 megabytes *** ByteCodeGen [Ghci1]: !!! ByteCodeGen [Ghci1]: finished in 0.10 milliseconds, allocated 0.047 megabytes Loading package ghc-prim-0.5.2.0 ... linking ... done. *** gcc: gcc -fno-stack-protector -DTABLES_NEXT_TO_CODE '-fuse-ld=gold' -B/home/alp/ghc/libraries/integer-gmp/dist-install/build --print-file-name libgmp.so Loading package integer-gmp-1.0.1.0 ... linking ... done. Loading package base-4.11.0.0 ... linking ... done. Erreur de segmentation (core dumped) }}} Tomorrow I'll fire up gdb and see if this builds lets me figure out precisely where things are going wrong. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14675#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler