bug#30852: 27.0.50; infinite loop in internal-get-lisp-face-attribute

bug#30852: 27.0.50; infinite loop in internal-get-lisp-face-attribute

[Aaron Jensen]

This could be a bug in a package: eterm-256color but I wanted to report
it in case it's an emacs bug.

0. Install https://github.com/dieggsy/eterm-256color devel branch
1. emacs -Q
2. (require 'eterm-256color-mode)
3. (add-hook 'term-mode-hook #'eterm-256color-mode)
4. M-x ansi-term

It's possible that you'll need a color prompt to trigger the inf loop,
I'm not sure.

Here is the trace of where it is stuck:

internal-get-lisp-face-attribute
face-attribute
face-foreground
unknown
mapcar
eterm-256color-handle-colors
unknown
unknown
eterm-256color-handle-ansi-escape
apply
term-handle-ansi-escape
term-emulate-terminal

via:

* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  * frame #0: 0x00000001002a29bd emacs`assq_no_quit(key=0x000000000204ed50, list=0x00000001152f10f3) at fns.c:1422
    frame #1: 0x000000010016a4d3 emacs`lface_from_face_name_no_resolve(f=0x0000000105008bb0, face_name=0x000000000204ed50, signal_p=true) at xfaces.c:1859
    frame #2: 0x000000010015f372 emacs`lface_from_face_name(f=0x0000000105008bb0, face_name=0x000000000204ed50, signal_p=true) at xfaces.c:1884
    frame #3: 0x000000010016309c emacs`Finternal_get_lisp_face_attribute(symbol=0x000000000204ed50, keyword=0x0000000000000a50, frame=0x0000000000000000) at xfaces.c:3589
    frame #4: 0x0000000100299c01 emacs`funcall_subr(subr=0x0000000100454e80, numargs=3, args=0x00007ffeefbf4420) at eval.c:2901
    frame #5: 0x000000010029890d emacs`Ffuncall(nargs=4, args=0x00007ffeefbf4418) at eval.c:2821
    frame #6: 0x0000000100322d7a emacs`exec_byte_code(bytestr=0x00000001004c3b1c, vector=0x00000001004c3b3d, maxdepth=0x000000000000002e, args_template=0x000000000000100a, nargs=4, args=0x00007ffeefbf4f78) at bytecode.c:632
    frame #7: 0x000000010029a014 emacs`funcall_lambda(fun=0x00000001004c3aed, nargs=4, arg_vector=0x00007ffeefbf4f58) at eval.c:3022
    frame #8: 0x0000000100298955 emacs`Ffuncall(nargs=5, args=0x00007ffeefbf4f50) at eval.c:2823
    frame #9: 0x0000000100322d7a emacs`exec_byte_code(bytestr=0x00000001004c3cdc, vector=0x00000001004c3cfd, maxdepth=0x0000000000000022, args_template=0x0000000000000c06, nargs=3, args=0x00007ffeefbf5a40) at bytecode.c:632
    frame #10: 0x000000010029a014 emacs`funcall_lambda(fun=0x00000001004c3cad, nargs=3, arg_vector=0x00007ffeefbf5a28) at eval.c:3022
    frame #11: 0x0000000100298955 emacs`Ffuncall(nargs=4, args=0x00007ffeefbf5a20) at eval.c:2823
    frame #12: 0x0000000100322d7a emacs`exec_byte_code(bytestr=0x0000000101fc6e04, vector=0x00000001174e1815, maxdepth=0x0000000000000016, args_template=0x0000000000000406, nargs=1, args=0x00007ffeefbf64f8) at bytecode.c:632
    frame #13: 0x000000010029a014 emacs`funcall_lambda(fun=0x0000000117951dc5, nargs=1, arg_vector=0x00007ffeefbf64f0) at eval.c:3022
    frame #14: 0x0000000100298955 emacs`Ffuncall(nargs=2, args=0x00007ffeefbf64e8) at eval.c:2823
    frame #15: 0x0000000100299414 emacs`call1(fn=0x0000000117951dc5, arg1=0x000000000204ed50) at eval.c:2672
    frame #16: 0x00000001002b123c emacs`mapcar1(leni=8, vals=0x00007ffeefbf65b0, fn=0x0000000117951dc5, seq=0x000000010223c215) at fns.c:2449
    frame #17: 0x00000001002b55ff emacs`Fmapcar(function=0x0000000117951dc5, sequence=0x000000010223c215) at fns.c:2538
    frame #18: 0x0000000100299bce emacs`funcall_subr(subr=0x00000001007b7038, numargs=2, args=0x00007ffeefbf6be0) at eval.c:2898
    frame #19: 0x000000010029890d emacs`Ffuncall(nargs=3, args=0x00007ffeefbf6bd8) at eval.c:2821
    frame #20: 0x0000000100322d7a emacs`exec_byte_code(bytestr=0x0000000101fc6e24, vector=0x0000000115f3d805, maxdepth=0x000000000000002a, args_template=0x0000000000000806, nargs=1, args=0x00007ffeefbf77f8) at bytecode.c:632
    frame #21: 0x000000010029a014 emacs`funcall_lambda(fun=0x0000000116741ba5, nargs=1, arg_vector=0x00007ffeefbf77f0) at eval.c:3022
    frame #22: 0x0000000100298955 emacs`Ffuncall(nargs=2, args=0x00007ffeefbf77e8) at eval.c:2823
    frame #23: 0x0000000100322d7a emacs`exec_byte_code(bytestr=0x0000000101fc6ea4, vector=0x000000011671b435, maxdepth=0x0000000000000012, args_template=0x000000000000080a, nargs=2, args=0x00007ffeefbf82e8) at bytecode.c:632
    frame #24: 0x000000010029a014 emacs`funcall_lambda(fun=0x0000000118a1c9c5, nargs=2, arg_vector=0x00007ffeefbf82d8) at eval.c:3022
    frame #25: 0x0000000100298955 emacs`Ffuncall(nargs=3, args=0x00007ffeefbf82d0) at eval.c:2823
    frame #26: 0x0000000100322d7a emacs`exec_byte_code(bytestr=0x0000000101fc6ec4, vector=0x00000001174e17c5, maxdepth=0x000000000000003e, args_template=0x0000000000001416, nargs=5, args=0x00007ffeefbf8ed0) at bytecode.c:632
    frame #27: 0x000000010029a014 emacs`funcall_lambda(fun=0x000000011754f765, nargs=5, arg_vector=0x00007ffeefbf8ea8) at eval.c:3022
    frame #28: 0x0000000100298955 emacs`Ffuncall(nargs=6, args=0x00007ffeefbf8ea0) at eval.c:2823
    frame #29: 0x0000000100322d7a emacs`exec_byte_code(bytestr=0x0000000101fc7054, vector=0x0000000117995bd5, maxdepth=0x0000000000000046, args_template=0x0000000000000606, nargs=4, args=0x00007ffeefbf99d0) at bytecode.c:632
    frame #30: 0x000000010029a014 emacs`funcall_lambda(fun=0x0000000117951d95, nargs=4, arg_vector=0x00007ffeefbf99c8) at eval.c:3022
    frame #31: 0x0000000100298955 emacs`Ffuncall(nargs=5, args=0x00007ffeefbf99c0) at eval.c:2823
    frame #32: 0x00000001002986d0 emacs`Fapply(nargs=3, args=0x00007ffeefbfa338) at eval.c:2441
    frame #33: 0x0000000100299ac8 emacs`funcall_subr(subr=0x00000001007b5b68, numargs=3, args=0x00007ffeefbfa338) at eval.c:2876
    frame #34: 0x000000010029890d emacs`Ffuncall(nargs=4, args=0x00007ffeefbfa330) at eval.c:2821
    frame #35: 0x0000000100322d7a emacs`exec_byte_code(bytestr=0x0000000101c1282c, vector=0x0000000102b71675, maxdepth=0x0000000000000016, args_template=0x0000000000000202, nargs=3, args=0x00007ffeefbfae78) at bytecode.c:632
    frame #36: 0x000000010029a014 emacs`funcall_lambda(fun=0x000000010622cd45, nargs=3, arg_vector=0x00007ffeefbfae78) at eval.c:3022
    frame #37: 0x0000000100298955 emacs`Ffuncall(nargs=4, args=0x00007ffeefbfae70) at eval.c:2823
    frame #38: 0x0000000100322d7a emacs`exec_byte_code(bytestr=0x00000001121aa2b4, vector=0x00000001056107f5, maxdepth=0x000000000000006e, args_template=0x000000000000080a, nargs=2, args=0x00007ffeefbfbe58) at bytecode.c:632
    frame #39: 0x000000010029a014 emacs`funcall_lambda(fun=0x00000001055d1dc5, nargs=2, arg_vector=0x00007ffeefbfbe48) at eval.c:3022
    frame #40: 0x0000000100298955 emacs`Ffuncall(nargs=3, args=0x00007ffeefbfbe40) at eval.c:2823
    frame #41: 0x00000001002986d0 emacs`Fapply(nargs=2, args=0x00007ffeefbfc658) at eval.c:2441
    frame #42: 0x000000010027d775 emacs`apply1(fn=0x0000000001b071a0, arg=0x0000000115a135b3) at eval.c:2657
    frame #43: 0x0000000100342dd1 emacs`read_process_output_call(fun_and_args=0x0000000115a135a3) at process.c:5797
    frame #44: 0x00000001002899da emacs`internal_condition_case_1(bfun=(emacs`read_process_output_call at process.c:5796), arg=0x0000000115a135a3, handlers=0x0000000000004920, hfun=(emacs`read_process_output_error_handler at process.c:5802)) at eval.c:1356
    frame #45: 0x0000000100342d5c emacs`read_and_dispose_of_process_output(p=0x0000000115f3dc00, chars="\x1b[1m\x1b[7m%\x1b[27m\x1b[1m\x1b[m                                                                                                                                                                                      \r \r", nbytes=206, coding=0x0000000119c0da30) at process.c:6008
    frame #46: 0x000000010033d271 emacs`read_process_output(proc=0x0000000115f3dc05, channel=26) at process.c:5919
    frame #47: 0x000000010033bdfa emacs`wait_reading_process_output(time_limit=30, nsecs=0, read_kbd=-1, do_display=true, wait_for_cell=0x0000000000000000, wait_proc=0x0000000000000000, just_wait_proc=0) at process.c:5616
    frame #48: 0x0000000100008e14 emacs`sit_for(timeout=0x000000000000007a, reading=true, display_option=1) at dispnew.c:5804
    frame #49: 0x000000010017d90c emacs`read_char(commandflag=1, map=0x0000000115a0fe23, prev_event=0x0000000000000000, used_mouse_menu=0x00007ffeefbfe9d7, end_time=0x0000000000000000) at keyboard.c:2723
    frame #50: 0x00000001001790ae emacs`read_key_sequence(keybuf=0x00007ffeefbfecf0, bufsize=30, prompt=0x0000000000000000, dont_downcase_last=false, can_return_switch_frame=true, fix_current_buffer=true, prevent_redisplay=false) at keyboard.c:9137
    frame #51: 0x0000000100177c5b emacs`command_loop_1 at keyboard.c:1370
    frame #52: 0x000000010028991f emacs`internal_condition_case(bfun=(emacs`command_loop_1 at keyboard.c:1260), handlers=0x0000000000004920, hfun=(emacs`cmd_error at keyboard.c:939)) at eval.c:1332
    frame #53: 0x000000010018cf6c emacs`command_loop_2(ignore=0x0000000000000000) at keyboard.c:1111
    frame #54: 0x0000000100289128 emacs`internal_catch(tag=0x000000000000ba00, func=(emacs`command_loop_2 at keyboard.c:1107), arg=0x0000000000000000) at eval.c:1097
    frame #55: 0x0000000100176c38 emacs`command_loop at keyboard.c:1090
    frame #56: 0x0000000100176aa0 emacs`recursive_edit_1 at keyboard.c:696
    frame #57: 0x0000000100176dd4 emacs`Frecursive_edit at keyboard.c:767
    frame #58: 0x0000000100174a33 emacs`main(argc=1, argv=0x00007ffeefbff358) at emacs.c:1724
    frame #59: 0x00007fff5f500115 libdyld.dylib`start + 1
    frame #60: 0x00007fff5f500115 libdyld.dylib`start + 1


In GNU Emacs 27.0.50 (build 1, x86_64-apple-darwin17.4.0, NS appkit-1561.20 Version 10.13.3 (Build 17D102))
 of 2018-03-18 built on aaron-mbt.local
Repository revision: 667cdf421ff64b1fe736f75e8a7f8864de1b5026
Windowing system distributor 'Apple', version 10.3.1561
System Description:  Mac OS X 10.13.3

Recent messages:
Starting new Ispell process aspell with default dictionary...
Spacemacs is ready.
Warning: desktop file appears to be in use by PID 40925.
Using it may cause conflicts.  Use it anyway? (y or n) y
Wrote /Users/aaronjensen/.emacs.d/.cache/.emacs.desktop.lock
Desktop: 1 frame, 0 buffers restored.
Loading /Users/aaronjensen/.emacs-private.el (source)...done
Loading /Users/aaronjensen/.emacs.d/.cache/recentf...done
Open the quickhelp.
Skipping check for new version (reason: dotfile)

Configured using:
 'configure --enable-locallisppath=/usr/local/share/emacs/site-lisp
 --infodir=/usr/local/opt/emacs-plus/share/info/emacs
 --prefix=/usr/local/opt/emacs-plus 'CFLAGS=-g -O0
 -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/include/libxml2
 -I/usr/local/opt/imagemagick@6/include' 'LDFLAGS=-g
 -L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/lib
 -lxml2 -lz -lpthread -licucore''

Configured features:
RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS
THREADS LCMS2

Important settings:
  value of $LC_CTYPE: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Messages

Minor modes in effect:
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  global-origami-mode: t
  origami-mode: t
  Info-breadcrumbs-in-mode-line-mode: t
  flycheck-pos-tip-mode: t
  global-flycheck-mode: t
  flx-ido-mode: t
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  global-evil-surround-mode: t
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  ivy-mode: t
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  which-key-mode: t
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  global-undo-tree-mode: t
  undo-tree-mode: t
  evil-mode: t
  evil-local-mode: t
  spacemacs-leader-override-mode: t
  global-spacemacs-leader-override-mode: t
  global-hl-line-mode: t
  xterm-mouse-mode: t
  global-auto-revert-mode: t
  shell-dirtrack-mode: t
  ido-vertical-mode: t
  global-page-break-lines-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
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  font-lock-mode: t
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Features:
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Memory information:
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 (strings 32 188350 120720)
 (string-bytes 1 5820556)
 (vectors 16 87066)
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bug#30852: (27.0.50; infinite loop in internal-get-lisp-face-attribute)

[Aaron Jensen]

After stepping through this, it looks like it may be eterm-256color that
is inf looping. Please disregard this for now and I'll respond after
figuring it out one way or the other for sure.

We're discussing here: https://github.com/dieggsy/eterm-256color/issues/5

bug#30852: (27.0.50; infinite loop in internal-get-lisp-face-attribute)

[Aaron Jensen]

close 30852
quit

This appears to be a problem in the library.

bug#30852: 27.0.50; infinite loop in internal-get-lisp-face-attribute

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Sun, 18 Mar 2018 20:39:29 -0700
> 
> This could be a bug in a package: eterm-256color but I wanted to report
> it in case it's an emacs bug.
> 
> 0. Install https://github.com/dieggsy/eterm-256color devel branch
> 1. emacs -Q
> 2. (require 'eterm-256color-mode)
> 3. (add-hook 'term-mode-hook #'eterm-256color-mode)
> 4. M-x ansi-term
> 
> It's possible that you'll need a color prompt to trigger the inf loop,
> I'm not sure.
> 
> Here is the trace of where it is stuck:
> 
> internal-get-lisp-face-attribute

Are you that saying eterm-256color causes Emacs to create a face alist
that is a circular list?

> * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
>   * frame #0: 0x00000001002a29bd emacs`assq_no_quit(key=0x000000000204ed50, list=0x00000001152f10f3) at fns.c:1422
>     frame #1: 0x000000010016a4d3 emacs`lface_from_face_name_no_resolve(f=0x0000000105008bb0, face_name=0x000000000204ed50, signal_p=true) at xfaces.c:1859

Can you show the value of f->face_alist in this frame #1?

bug#30852: 27.0.50; infinite loop in internal-get-lisp-face-attribute

[Aaron Jensen]

On Sun, Mar 18, 2018 at 11:54 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> Are you that saying eterm-256color causes Emacs to create a face alist
> that is a circular list?

No, the problem, which I do not fully understand, is here:

https://github.com/dieggsy/eterm-256color/blob/a43f38a7d78364c34efde10dfce0d518f9f4df62/eterm-256color.el#L126-L156

(defun eterm-256color-handle-ansi-escape (handle-fun &rest args)
  (pcase-let
      (((or ;; Parameters from Emacs 27.
         `(,proc ,params ,char)
         ;; Parameters up to Emacs 26.
         (and
          `(,proc ,char)
          (let params
            ;; Hack the dynamic vars into a list.
            (delq nil
                  (delq -1
                        (list
                         (bound-and-true-p term-terminal-previous-parameter-4)
                         (bound-and-true-p term-terminal-previous-parameter-3)
                         (bound-and-true-p term-terminal-previous-parameter-2)
                         (bound-and-true-p term-terminal-previous-parameter)
                         (bound-and-true-p term-terminal-parameter)))))))
        args))
    (if (eq char '?m)
        (while params
          (pcase params
            (`(38 5 ,color256 . ,_)
             (eterm-256color-handle-colors color256 'fg)
             (setq params (nthcdr 3 params)))
            (`(48 5 ,color256 . ,_)
             (eterm-256color-handle-colors color256 'bg)
             (setq params (nthcdr 3 params)))
            (`(,x . ,_)
             (eterm-256color-handle-colors x)
             (setq params (cdr params)))))
      (apply handle-fun args))))

Specifically, what happens is that the `(setq params ...)` are
ineffective. `params` is always bound to what it is bound to via the
pcase-let. This only happens the first time this function is run--I'm
guessing if `params` is already bound as a variable (as it would be
the second time) then the `setq` and the `let` affect the same thing.

Changing the while loop to this fixes the bug:

(setq my-params params)
(while my-params
  (pcase my-params
    (`(38 5 ,color256 . ,_)
     (eterm-256color-handle-colors color256 'fg)
     (setq my-params (nthcdr 3 my-params)))
    (`(48 5 ,color256 . ,_)
     (eterm-256color-handle-colors color256 'bg)
     (setq my-params (nthcdr 3 my-params)))
    (`(,x . ,_)
     (eterm-256color-handle-colors x)
     (setq my-params (cdr my-params)))))