[GHC] #14675: GHC 8.4.1 regression: segfault when loading doctest on a module with ANNs on Ubuntu 16.04 or later

[GHC]

#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 at vm:~/14675$ /home/alp/ghc/inplace/bin/ghc-stage2 --info | grep commit
  ,("Project Git commit id","c6cf13ca63f3a11a8da7c7e3bd69e673a8df5440")
 alp at 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 at 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 at 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>
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