Re: Gnus + Gmail + IMAP

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 30 Jun 2015 21:10:44 +0200
> From: Alexander Shukaev <haroogan@gmail.com>
> Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
> 
> God damn it. I don't know if you remember my post from yesterday where I was
> talking which hooks to attach `minibuffer-line--update' to in order to update
> minibuffer line on window and buffer switches properly. The conclusion was
> 
> (add-hook 'buffer-list-update-hook #'minibuffer-line--update)
> (add-hook 'window-configuration-change-hook #'minibuffer-line--update)
> 
> By examining the GDB output (which obviously repeats):
> 
> #1084 0x00000004001f0978 in run_hook_with_args (nargs=1, args=0x7a8d40,
> funcall=0x4001f0434 <funcall_nil>) at
> C:/Users/Haroogan/Projects/GitHub/MINGW-packages/mingw-w64-emacs-git/src/emacs/src/eval.c:2529
> #1085 0x00000004001f04e2 in Frun_hook_with_args (nargs=1, args=0x7a8d40) at
> C:/Users/Haroogan/Projects/GitHub/MINGW-packages/mingw-w64-emacs-git/src/emacs/src/eval.c:2390
> #1086 0x00000004001f0a0a in run_hook (hook=-17119289912) at
> C:/Users/Haroogan/Projects/GitHub/MINGW-packages/mingw-w64-emacs-git/src/emacs/src/eval.c:2543
> #1087 0x00000004001f049c in Frun_hooks (nargs=1, args=0x7a8e88) at
> C:/Users/Haroogan/Projects/GitHub/MINGW-packages/mingw-w64-emacs-git/src/emacs/src/eval.c:2372
> 
> I've somehow recalled those hooks. It turns out that this one
> 
> (add-hook 'buffer-list-update-hook #'minibuffer-line--update)
> 
> is seems to be causing the infinite recursion and most importantly only in the
> case of `M-x gnus RET' as I haven't experienced that before.

Yes, the recursion is clearly visible in the Lisp backtrace.

> What could be the problem here, Eli?

I think this part of the Lisp backtrace should give you a clue:

  "format-time-string" (0x8318d0)
  "propertize" (0x831b18)
  "let*" (0x831d68)
  "eval" (0x831fc8)
  "format-mode-line" (0x833810)
  "minibuffer-line--update" (0x833e88)
  "run-hooks" (0x833fc8)
  "format-time-string" (0x8356a0)
  "propertize" (0x8358e8)
  "let*" (0x835b38)
  "eval" (0x835d98)
  "format-mode-line" (0x8375e0)
  "minibuffer-line--update" (0x837c58)
  "run-hooks" (0x837d98)
  "utf-7-imap-post-read-conversion" (0x839ce8)
  "decode-coding-string" (0x83a380)
  "utf7-decode" (0x83a8d0)
  "nnimap-get-groups" (0x83ae40)
  "nnimap-request-newgroups" (0x83b3b0)
  "gnus-request-newgroups" (0x83b920)
  "gnus-ask-server-for-new-groups" (0x83be90)

Somehow, minibuffer-line--update calls format-mode-line, which calls
format-time-string, which again calls run-hooks, which again calls
minibuffer-line--update.  Look into your hook and see how this can
happen.