internal error: ASSERTION FAILED: file rts/RetainerProfile.c, line 1717

Summary

> stack exec zeno --profile -- notarise seed +RTS -p -hr
zeno 0.2.4.0 flood@b0962e2e Jun 20 (commit 193) (dirty)                           
[04:13:00][Info] Listening on 0.0.0.0:40440                                       
zeno: internal error: ASSERTION FAILED: file rts/RetainerProfile.c, line 1717     
                                                                                  
    (GHC version 8.8.2 for x86_64_unknown_linux)                                  
    Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug      
Aborted (core dumped)                                                             

Steps to reproduce

git clone https://github.com/ssadler/zeno
cd zeno
git checkout flood
./manage.sh build-profile
stack exec zeno --profile -- notarise seed +RTS -p -hr

In another terminal, install python3-gevent and run python3 flood.py.

The server dies with the above error as soon as the script is called, and it does so reliably. Using -hc instead of -hr works as expected.

Expected behavior

The script floods the server with noops on a single connection, the server is leaking memory.

Environment

• GHC version used: 8.8.2
• Operating System: Ubuntu 18.04
• System Architecture: x86-64