Python REPL freezes within a couple of minutes, every time (reproducible)

[tsoernes]

Description :octocat:

Python REPL freezes

Reproduction guide :beetle:

• Start Emacs
• Open a Python buffer
• Execute python-start-or-switch-repl
• Use the REPL as you normally would

Happens with both IPython and regular Python.

Observed behaviour: :eyes: :broken_heart: The REPL freezes within a couple of minutes. Emacs becomes unresponsive. Is reproducible. Happens every time.

I activated 'toggle-debug-on-quit'. Then, when the REPL froze, I hit C-g and got this:

Debugger entered--entering a function:
* python-util-strip-string(nil)
  python-shell-completion-get-completions(#<process Python> nil "OA")
  apply(python-shell-completion-get-completions (#<process Python> nil "OA"))
  #f(compiled-function (&rest args2) #<bytecode 0x1d290f1>)("OA")
  #f(compiled-function (string pred action) #<bytecode 0x1d29119>)("OA" nil t)
  all-completions("OA" #f(compiled-function (string pred action) #<bytecode 0x1d29119>) nil)
  completion-pcm--all-completions("" ("OA" point) #f(compiled-function (string pred action) #<bytecode 0x1d29119>) nil)
  completion-basic-all-completions("OA" #f(compiled-function (string pred action) #<bytecode 0x1d29119>) nil 2)
  #f(compiled-function (style) #<bytecode 0x1d29141>)(basic)
  completion--some(#f(compiled-function (style) #<bytecode 0x1d29141>) (basic partial-completion emacs22))
  completion--nth-completion(2 "OA" #f(compiled-function (string pred action) #<bytecode 0x1d29119>) nil 2 nil)
  completion-all-completions("OA" #f(compiled-function (string pred action) #<bytecode 0x1d29119>) nil 2)
  company-capf(candidates "OA")
  company--multi-backend-adapter-candidates((company-files company-capf) "OA" nil)
  company--multi-backend-adapter((company-files company-capf) candidates "OA")
  apply(company--multi-backend-adapter (company-files company-capf) (candidates "OA"))
  company-call-backend-raw(candidates "OA")
  company--fetch-candidates("OA")
  company-calculate-candidates("OA" nil)
  company--begin-new()
  company--perform()
  company-auto-begin()
  company-idle-begin(#<buffer *Python*> #<window 14 on *Python*> 520 1710)
  apply(company-idle-begin (#<buffer *Python*> #<window 14 on *Python*> 520 1710))
  timer-event-handler([t 23701 11465 771002 nil company-idle-begin (#<buffer *Python*> #<window 14 on *Python*> 520 1710) nil 875000])

Expected behaviour: :heart: :smile: Should not freeze.

System Info :computer:

• OS: gnu/linux
• Emacs: 26.1
• Spacemacs: 0.300.0
• Spacemacs branch: develop (rev. 4b195ddfc)
• Graphic display: t
• Distribution: spacemacs
• Editing style: vim
• Completion: helm
• Layers:

  (html yaml javascript python rust latex bibtex theming auto-completion shell-scripts helm auto-completion better-defaults emacs-lisp git markdown org spell-checking syntax-checking shell lsp ipython-notebook
    (markdown :variables markdown-live-preview-engine 'vmd)
    (shell :variables shell-default-shell 'shell))

• System configuration features: XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 MODULES THREADS XWIDGETS LCMS2

Backtrace :paw_prints:

Debugger entered--entering a function:
* python-util-strip-string(nil)
  python-shell-completion-get-completions(#<process Python> nil "OA")
  apply(python-shell-completion-get-completions (#<process Python> nil "OA"))
  #f(compiled-function (&rest args2) #<bytecode 0x1d290f1>)("OA")
  #f(compiled-function (string pred action) #<bytecode 0x1d29119>)("OA" nil t)
  all-completions("OA" #f(compiled-function (string pred action) #<bytecode 0x1d29119>) nil)
  completion-pcm--all-completions("" ("OA" point) #f(compiled-function (string pred action) #<bytecode 0x1d29119>) nil)
  completion-basic-all-completions("OA" #f(compiled-function (string pred action) #<bytecode 0x1d29119>) nil 2)
  #f(compiled-function (style) #<bytecode 0x1d29141>)(basic)
  completion--some(#f(compiled-function (style) #<bytecode 0x1d29141>) (basic partial-completion emacs22))
  completion--nth-completion(2 "OA" #f(compiled-function (string pred action) #<bytecode 0x1d29119>) nil 2 nil)
  completion-all-completions("

[tsoernes]

Disabling company-mode in the buffer seems to 'resolve' this issue. Here's an assortment of the errors I get in messages when it is enabled:

Shell native completion is disabled, using fallback
Company: An error occurred in auto-begin
Wrong type argument: integer-or-marker-p, nil
Company: An error occurred in auto-begin
Wrong type argument: integer-or-marker-p, nil
Shell native completion is disabled, using fallback
Company: An error occurred in post-command
Company: backend (company-files company-capf) error "Wrong type argument: arrayp, nil" with args (candidates df)

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