slime + clisp + emacs: server disconnects

[Stuart Little]

I am running

- emacs 26.2
- slime 2.24
- clisp 2.49

on Linux.

Running M-x slime in emacs with 'inferior-lisp-program' set to 'clisp' starts slime fine. I can usually run one evaluation (like say (+ 2 3)), whereupon any other action (pressing 'enter', say) will result in a disconnect:

Lisp connection closed unexpectedly: connection broken by remote peer

The inferior-lisp buffer reads as follows after the disconnect:

--- buffer starts ---

(progn (load "/home/chirvasitua/quicklisp/dists/quicklisp/software/slime-v2.24/swank-loader.lisp" :verbose t) (funcall (read-from-string "swank-loader:init") :from-emacs t) (funcall (read-from-string "swank:start-server") "/tmp/slime.19223"))

  i i i i i i i       ooooo    o        ooooooo   ooooo   ooooo
  I I I I I I I      8     8   8           8     8     o  8    8
  I  \ `+' /  I      8         8           8     8        8    8
   \  `-+-'  /       8         8           8      ooooo   8oooo
    `-__|__-'        8         8           8           8  8
        |            8     o   8           8     o     8  8
  ------+------       ooooo    8oooooo  ooo8ooo   ooooo   8

Welcome to GNU CLISP 2.49 (2010-07-07) <http://clisp.cons.org/>

Copyright (c) Bruno Haible, Michael Stoll 1992, 1993
Copyright (c) Bruno Haible, Marcus Daniels 1994-1997
Copyright (c) Bruno Haible, Pierpaolo Bernardi, Sam Steingold 1998
Copyright (c) Bruno Haible, Sam Steingold 1999-2000
Copyright (c) Sam Steingold, Bruno Haible 2001-2010

Type :h and hit Enter for context help.

[1]> 
;; Loading file /home/chirvasitua/quicklisp/dists/quicklisp/software/slime-v2.24/swank-loader.lisp ...
;; Loaded file /home/chirvasitua/quicklisp/dists/quicklisp/software/slime-v2.24/swank-loader.lisp
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/packages.fas ...
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/packages.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/backend.fas ...
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/backend.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/xref.fas ...
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/xref.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/metering.fas ...
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/metering.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/clisp.fas ...
WARNING: DEFUN/DEFMACRO: redefining function BREAK in
         /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/clisp.fas,
         was defined in /builddir/clisp-2.49/src/condition.fas
WARNING: Replacing method #<STANDARD-METHOD (#<BUILT-IN-CLASS T>)> in
         #<STANDARD-GENERIC-FUNCTION EMACS-INSPECT>
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/clisp.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/gray.fas ...
WARNING: The generic function #<STANDARD-GENERIC-FUNCTION STREAM-LINE-COLUMN>
         is being modified, but has already been called.
WARNING: The generic function #<STANDARD-GENERIC-FUNCTION STREAM-FORCE-OUTPUT>
         is being modified, but has already been called.
WARNING: The generic function #<STANDARD-GENERIC-FUNCTION STREAM-LINE-COLUMN>
         is being modified, but has already been called.
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/gray.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/match.fas ...
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/match.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/rpc.fas ...
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/rpc.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/swank.fas ...
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/swank.fas
0 errors, 5 warnings
;; Swank started at port: 41975.
CL-USER> 
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-trace-dialog.fas ...
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-trace-dialog.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-package-fu.fas ...
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-package-fu.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-presentations.fas ...
;;  Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-repl.fas ...
WARNING: The generic function
         #<STANDARD-GENERIC-FUNCTION THREAD-FOR-EVALUATION> is being modified,
         but has already been called.
WARNING: Replacing method
          #<STANDARD-METHOD
            (#<STRUCTURE-CLASS MULTITHREADED-CONNECTION> (EQL :FIND-EXISTING))>
         in #<STANDARD-GENERIC-FUNCTION THREAD-FOR-EVALUATION>
;;  Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-repl.fas
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-presentations.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-macrostep.fas ...
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-macrostep.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-fuzzy.fas ...
;;  Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-util.fas ...
;;  Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-util.fas
;;  Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-c-p-c.fas ...
;;  Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-c-p-c.fas
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-fuzzy.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-fancy-inspector.fas ...
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-fancy-inspector.fas
;; Loading file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-arglists.fas ...
WARNING: Test failed: (&KEY #'#'+) => "(&key (function  #'+))"
         Expected: One of: "(&key (function #'+))", "(&key (function (function
         +)))"
;; Loaded file /home/chirvasitua/.slime/fasl/2.24/clisp-2.49-unix-pc386/contrib/swank-arglists.fas

Process inferior-lisp segmentation fault

--- buffer ends ---

More information:

- starting clisp in a terminal all on its own seems to work fine; I haven't had segmentation faults using it in isolation from slime.

- I tried to start the server from within clisp and connect to it:

(a) rlwrap clisp
(b) (load "~/quicklisp/dists/quicklisp/software/slime-v2.24/swank-loader.lisp")
(c) (swank-loader::init :reload t)
(d) (swank:create-server :port 7000)
(e) from within emacs: M-x slime-connect with localhost and port 7000

Same behavior as before: I get connected, get to make a few evaluations, get disconnected.

This time around rlwrap tells me (in the terminal where I started clisp):

rlwrap: warning: clisp crashed, killed by SIGSEGV