bug#23158: 25.1.50; crash by consecutive http accesses

[Katsumi Yamaoka <yamaoka@jpl.org>]

On Wed, 30 Mar 2016 18:23:19 +0300, Eli Zaretskii wrote:
>> those consecutive http accesses seem to crash Emacs.

> Thanks.  Can you try reproducing the problem in an unoptimized build,
> and show the backtrace from that?

I built Emacs from the git master with the option CFLAGS='-O0'
and verified it works for the test code with no problem.  However,
for reading the spam mail in question, Emacs doesn't crash but it
gets to be unusable; when I try to run some command, Emacs says

Wrong type argument: sequencep, #<process www.gravatar.com<46>>

and does not proceed.  A Lisp backtrace follows:

Debugger entered--Lisp error: (wrong-type-argument sequencep #<process www.gravatar.com<46>>)
  process-list()
  window--process-window-list()
  window--adjust-process-windows()
  read-from-minibuffer("Switch to buffer in other frame (default *Summary nnml:tmp*): " nil (keymap (10 . minibuffer-complete-and-exit) (13 . minibuffer-complete-and-exit) keymap (menu-bar keymap (minibuf "Minibuf" keymap (tab menu-item "Complete" minibuffer-complete :help "Complete as far as possible") (space menu-item "Complete Word" minibuffer-complete-word :help "Complete at most one word") (63 menu-item "List Completions" minibuffer-completion-help :help "Display all possible completions") "Minibuf")) (27 keymap (118 . switch-to-completions)) (prior . switch-to-completions) (63 . minibuffer-completion-help) (32 . minibuffer-complete-word) (9 . minibuffer-complete) keymap (menu-bar keymap (minibuf "Minibuf" keymap (previous menu-item "Previous History Item" previous-history-element :help "Put previous minibuffer history element in the minibuffer") (next menu-item "Next History Item" next-history-element :help "Put next minibuffer history element in the minibuffer") (isearch-backward menu-item "Isearch History Backward" isearch-backward :help "Incrementally search minibuffer history backward") (isearch-forward menu-item "Isearch History Forward" isearch-forward :help "Incrementally search minibuffer history forward") (return menu-item "Enter" exit-minibuffer :key-sequence "" :help "Terminate input and exit minibuffer") (quit menu-item "Quit" abort-recursive-edit :help "Abort input and exit minibuffer") "Minibuf")) (10 . exit-minibuffer) (13 . exit-minibuffer) (7 . abort-recursive-edit) (C-tab . file-cache-minibuffer-complete) (9 . self-insert-command) (XF86Back . previous-history-element) (up . previous-line-or-history-element) (prior . previous-history-element) (XF86Forward . next-history-element) (down . next-line-or-history-element) (next . next-history-element) (27 keymap (114 . previous-matching-history-element) (115 . next-matching-history-element) (112 . previous-history-element) (110 . next-history-element))) nil buffer-name-history "*Summary nnml:tmp*" nil)
  completing-read-default("Switch to buffer in other frame (default *Summary nnml:tmp*): " internal-complete-buffer nil confirm-after-completion nil buffer-name-history "*Summary nnml:tmp*" nil)
  read-buffer("Switch to buffer in other frame: " #<buffer *Summary nnml:tmp*> confirm-after-completion)
  read-buffer-to-switch("Switch to buffer in other frame: ")
  (list (read-buffer-to-switch "Switch to buffer in other frame: "))
  call-interactively(switch-to-buffer-other-frame nil nil)
  command-execute(switch-to-buffer-other-frame)

Thanks.