Segfault in retainer profiling

To reproduce, build ghc using "prof" flavor, then

$ ghc-stage2 --interactive +RTS -hr
GHCi, version 8.7.20180905: http://www.haskell.org/ghc/  :? for help
Loaded GHCi configuration from /home/omer/rcbackup/.ghci
λ:1> sequence_ (replicate 100000000 (return ()))
zsh: segmentation fault (core dumped)  ghc-stage2 --interactive +RTS -hr

If I use debug runtime in stage2 compiler I can't even run the repl:

haskell $ ghc-stage2 --interactive +RTS -hr
rr: Saving execution to trace directory `/home/omer/.local/share/rr/ghc-stage2-13'.
GHCi, version 8.7.20180906: http://www.haskell.org/ghc/  :? for help
zsh: segmentation fault  ghc-stage2 --interactive +RTS -hr

Edited Mar 10, 2019 by Ömer Sinan Ağacan

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