To run the test: Go to wreck.lisp Modify the first line to point to your base directory: (defvar **prog-lisp-dir** "c:/prog/wreck/") Paste the ENTIRE file into TWO command line/Win64 SBCLs In the FIRST one - call (start-server) In the SECOND one - call (start-stress-test) The FIRST will now serve a web server on port 82 The SECOND one will keep connecting/disconnecting If on the SECOND one you call (show-progress), you should see positive growing values for successes AND failures. Within about 6-10 hours, the SERVER (FIRST) will crash to the debugger: * fatal error encountered in SBCL pid 10604(tid 10225392): GC invariant lost, file "gencgc.c", line 3525