[GHC] #13433: Segmentation faults in profiled way

[GHC]

#13433: Segmentation faults in profiled way
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        Reporter:  bgamari           |                Owner:  simonmar
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Alright, I have once again reproduced this. Unfortunately I realized that
 you actually need to cherry-pick a few patches on top of 6ebfbd as it
 doesn't build on its own. One of these patches fixes a silly typo. The
 other is my rather crude fix to #13233 (Phab:D3063) ensuring we don't
 attempt to tick string literals. I'm a bit suspicious of the latter, but
 the build doesn't build any lint warnings so I've been operating under the
 assumption that it's safe.

 Without further ado, here is a full repro,
 {{{
 #!/bin/bash -e

 git clone git://git.haskell.org/ghc --recursive ghc-T13433
 cd ghc-T13433
 cat >mk/build.mk <<'EOF'
 BuildFlavour = prof

 ifneq "$(BuildFlavour)" ""
   include mk/flavours/$(BuildFlavour).mk
 endif

 GhcStage2HcOpts += -dcore-lint -dcmm-lint
 define add_mods_flag =
   $(foreach mod,$(2),$(eval $(basename $(mod))_HC_OPTS += $(1)))
 endef

 $(call add_mods_flag,-fprof-auto,$(wildcard compiler/typecheck/*.hs))

 STRIP_CMD = :
 EOF
 ./boot
 ./configure
 make -j8

 wget https://ghc.haskell.org/trac/ghc/raw-attachment/ticket/13387/Main.hs
 inplace/bin/ghc-stage2 -O2 -fforce-recomp Main.hs +RTS -p
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13433#comment:15>
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