bug#10664: 24.0.93; JIT font-lock infloops in a C file

[Eli Zaretskii]

> Date: Mon, 30 Jan 2012 20:23:49 +0200
> From: Eli Zaretskii <eliz@gnu.org>

Ping!

> This bug report will be sent to the Bug-GNU-Emacs mailing list
> and the GNU bug tracker at debbugs.gnu.org.  Please check that
> the From: line contains a valid email address.  After a delay of up
> to one day, you should receive an acknowledgement at that address.
> 
> Please write in English if possible, as the Emacs maintainers
> usually do not have translators for other languages.
> 
> Please describe exactly what actions triggered the bug, and
> the precise symptoms of the bug.  If you can, give a recipe
> starting from `emacs -Q':
> 
> I don't have a recipe starting from "emacs -Q", sorry.
> 
> I left my freshly built Emacs 24.0.93 running, and when I returned to
> it a few hours later, I found it unresponsive, endlessly showing in
> the echo area "JIT lock socket.c", interspersed with GC messages
> (I have garbage-collection-messages set non-nil).
> 
> Breaking into Emacs with a debugger produced the backtrace below (it's
> an optimized build, so the backtrace may be inaccurate, sorry).  I
> attach the file socket.c (part of the Guile sources) as well.
> 
> I still have that session in a debugger, so if someone wants me to
> look around and show some values, I can do that.
> 
> #0  find_symbol_value (symbol=50731778) at data.c:1044
> 1044          return do_symval_forwarding (SYMBOL_FWD (sym));
> (gdb) bt
> #0  find_symbol_value (symbol=50731778) at data.c:1044
> #1  0x0100fb9b in specbind (symbol=50731778, value=50616370) at eval.c:3322
> #2  0x0109f6d5 in exec_byte_code (bytestr=50731778, vector=2,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:747
> #3  0x01011a8a in funcall_lambda (fun=69096517, nargs=1, arg_vector=0x82df24)
>     at eval.c:3218
> #4  0x01011eed in Ffuncall (nargs=2, args=0x41e5445) at eval.c:3048
> #5  0x0109f68c in exec_byte_code (bytestr=50731778, vector=1,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:785
> #6  0x0109ff82 in Fbyte_code (bytestr=3, vector=3, maxdepth=3)
>     at bytecode.c:423
> #7  0x01011227 in eval_sub (form=20240912) at eval.c:2341
> #8  0x0100eef0 in internal_catch (tag=3, func=0x1010ce6 <eval_sub>,
>     arg=68864406) at eval.c:1257
> #9  0x0109ed60 in exec_byte_code (bytestr=50731778, vector=141,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:966
> #10 0x01011a8a in funcall_lambda (fun=68468261, nargs=1, arg_vector=0x82e2d4)
>     at eval.c:3218
> #11 0x01011eed in Ffuncall (nargs=2, args=0x414be25) at eval.c:3048
> #12 0x0109f68c in exec_byte_code (bytestr=50731778, vector=1,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:785
> #13 0x01011a8a in funcall_lambda (fun=69603781, nargs=1, arg_vector=0x82e444)
>     at eval.c:3218
> #14 0x01011eed in Ffuncall (nargs=2, args=0x42611c5) at eval.c:3048
> #15 0x0109f68c in exec_byte_code (bytestr=50731778, vector=1,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:785
> #16 0x01011a8a in funcall_lambda (fun=69603397, nargs=2, arg_vector=0x82e5b4)
>     at eval.c:3218
> #17 0x01011eed in Ffuncall (nargs=3, args=0x4261045) at eval.c:3048
> #18 0x0109f68c in exec_byte_code (bytestr=50731778, vector=2,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:785
> #19 0x01011a8a in funcall_lambda (fun=69619589, nargs=1, arg_vector=0x82e72c)
>     at eval.c:3218
> #20 0x01011eed in Ffuncall (nargs=2, args=0x4264f85) at eval.c:3048
> #21 0x0101257a in call1 (fn=3, arg1=3) at eval.c:2756
> #22 0x0103162e in mapcar1 (leni=1, vals=0x0, fn=69619589, seq=50731778)
>     at fns.c:2346
> #23 0x010319d5 in Fmapc (function=3, sequence=71107830) at fns.c:2434
> #24 0x010120e8 in Ffuncall (nargs=3, args=0x134acf8) at eval.c:2990
> #25 0x0109f68c in exec_byte_code (bytestr=50731778, vector=2,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:785
> #26 0x01011a8a in funcall_lambda (fun=69619429, nargs=3, arg_vector=0x82e9e4)
>     at eval.c:3218
> #27 0x01011eed in Ffuncall (nargs=4, args=0x4264ee5) at eval.c:3048
> #28 0x0109f68c in exec_byte_code (bytestr=50731778, vector=3,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:785
> #29 0x01011a8a in funcall_lambda (fun=19193997, nargs=2, arg_vector=0x82ec68)
>     at eval.c:3218
> #30 0x01011eed in Ffuncall (nargs=3, args=0x124e08d) at eval.c:3048
> #31 0x01012618 in funcall_nil (nargs=3, args=0x3) at eval.c:2504
> #32 0x0100f5af in run_hook_with_args (nargs=3, args=0x82ec64,
>     funcall=0x1012600 <funcall_nil>) at eval.c:2693
> #33 0x0100f6f3 in Frun_hook_with_args (nargs=3, args=0x3) at eval.c:2554
> #34 0x01012184 in Ffuncall (nargs=4, args=0x134a01d) at eval.c:2969
> #35 0x0109f68c in exec_byte_code (bytestr=50731778, vector=3,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:785
> #36 0x0109ff82 in Fbyte_code (bytestr=3, vector=3, maxdepth=3)
>     at bytecode.c:423
> #37 0x01011227 in eval_sub (form=20240912) at eval.c:2341
> #38 0x01012fbf in internal_lisp_condition_case (var=50869346,
>     bodyform=19206126, handlers=19206174) at eval.c:1454
> #39 0x0109ed1e in exec_byte_code (bytestr=50731778, vector=143,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:981
> #40 0x01011a8a in funcall_lambda (fun=19205877, nargs=2, arg_vector=0x82f034)
>     at eval.c:3218
> #41 0x01011eed in Ffuncall (nargs=3, args=0x1250ef5) at eval.c:3048
> #42 0x0109f68c in exec_byte_code (bytestr=50731778, vector=2,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:785
> #43 0x01011a8a in funcall_lambda (fun=19206717, nargs=1, arg_vector=0x82f278)
>     at eval.c:3218
> #44 0x01011eed in Ffuncall (nargs=2, args=0x125123d) at eval.c:3048
> #45 0x0101275e in Fapply (nargs=2, args=0x82f274) at eval.c:2439
> #46 0x01012184 in Ffuncall (nargs=3, args=0x134a065) at eval.c:2969
> #47 0x0109f68c in exec_byte_code (bytestr=50731778, vector=2,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:785
> #48 0x0109ff82 in Fbyte_code (bytestr=3, vector=3, maxdepth=3)
>     at bytecode.c:423
> #49 0x01011227 in eval_sub (form=20240912) at eval.c:2341
> #50 0x01012fbf in internal_lisp_condition_case (var=50616346,
>     bodyform=19235438, handlers=18612686) at eval.c:1454
> #51 0x0109ed1e in exec_byte_code (bytestr=50731778, vector=143,
>     maxdepth=50731776, args_template=50616346, nargs=0, args=0x0)
>     at bytecode.c:981
> #52 0x01011a8a in funcall_lambda (fun=19235277, nargs=1, arg_vector=0x82f64c)
>     at eval.c:3218
> #53 0x01011eed in Ffuncall (nargs=2, args=0x12581cd) at eval.c:3048
> #54 0x0101257a in call1 (fn=3, arg1=3) at eval.c:2756
> #55 0x0101e391 in timer_check () at keyboard.c:4437
> #56 0x0101e5c2 in readable_events (flags=1) at keyboard.c:3388
> #57 0x010244ad in get_input_pending (addr=0x13c51b0, flags=1)
>     at keyboard.c:6713
> #58 0x01024562 in detect_input_pending_run_timers (do_display=1)
>     at keyboard.c:10480
> #59 0x0101984b in wait_reading_process_output (time_limit=0, microsecs=0,
>     read_kbd=-1, do_display=1, wait_for_cell=50616346, wait_proc=0x0,
>     just_wait_proc=0) at process.c:4733
> #60 0x01025c6a in read_char (commandflag=1, nmaps=2, maps=0x82fab0,
>     prev_event=50616346, used_mouse_menu=0x82fbb8, end_time=0x0)
>     at keyboard.c:3851
> #61 0x01027b26 in read_key_sequence (keybuf=0x82fcb0, bufsize=30,
>     prompt=50616346, dont_downcase_last=0, can_return_switch_frame=1,
>     fix_current_buffer=1) at keyboard.c:9300
> #62 0x01029a9f in command_loop_1 () at keyboard.c:1448
> #63 0x0100efbb in internal_condition_case (bfun=0x10298ff <command_loop_1>,
>     handlers=50674074, hfun=0x102374d <cmd_error>) at eval.c:1500
> #64 0x0101cf0f in command_loop_2 (ignore=50616346) at keyboard.c:1159
> #65 0x0100eef0 in internal_catch (tag=3, func=0x101ceec <command_loop_2>,
>     arg=50616346) at eval.c:1257
> #66 0x0101cdc2 in recursive_edit_1 () at keyboard.c:1138
> #67 0x0101ced6 in Frecursive_edit () at keyboard.c:822
> #68 0x01002f21 in main (argc=1, argv=0xa47ff0) at emacs.c:1715
> 
> Lisp Backtrace:
> "c-in-knr-argdecl" (0x82df24)
> "byte-code" (0x82e030)
> "c-beginning-of-decl-1" (0x82e2d4)
> "c-set-fl-decl-start" (0x82e444)
> "c-context-set-fl-decl-start" (0x82e5b4)
> 0x4264f80 PVEC_COMPILED
> "mapc" (0x82e874)
> "c-font-lock-fontify-region" (0x82e9e4)
> "font-lock-fontify-region" (0x82ec68)
> "run-hook-with-args" (0x82ec64)
> "byte-code" (0x82ed60)
> "jit-lock-fontify-now" (0x82f034)
> "jit-lock-stealth-fontify" (0x82f278)
> "apply" (0x82f274)
> "byte-code" (0x82f370)
> "timer-event-handler" (0x82f64c)
> (gdb) p symbol
> $1 = 50731778
> (gdb) xtype
> Lisp_Symbol
> (gdb) xsymbol
> $2 = (struct Lisp_Symbol *) 0x3061b00
> "buffer-undo-list"
> (gdb)
> 
> 
> 
> If Emacs crashed, and you have the Emacs process in the gdb debugger,
> please include the output from the following gdb commands:
>     `bt full' and `xbacktrace'.
> For information about debugging Emacs, please read the file
> d:/usr/emacs/etc/DEBUG.
> 
> 
> In GNU Emacs 24.0.93.1 (i386-mingw-nt5.1.2600)
>  of 2012-01-29 on HOME-C4E4A596F7
> Windowing system distributor `Microsoft Corp.', version 5.1.2600
> Configured using:
>  `configure --with-gcc (3.4)'
> 
> Important settings:
>   value of $LC_ALL: nil
>   value of $LC_COLLATE: nil
>   value of $LC_CTYPE: nil
>   value of $LC_MESSAGES: nil
>   value of $LC_MONETARY: nil
>   value of $LC_NUMERIC: nil
>   value of $LC_TIME: nil
>   value of $LANG: ENU
>   value of $XMODIFIERS: nil
>   locale-coding-system: cp1255
>   default enable-multibyte-characters: t
> 
> Major mode: Mail
> 
> Minor modes in effect:
>   flyspell-mode: t
>   diff-auto-refine-mode: t
>   desktop-save-mode: t
>   show-paren-mode: t
>   display-time-mode: t
>   tooltip-mode: t
>   mouse-wheel-mode: t
>   tool-bar-mode: t
>   menu-bar-mode: t
>   file-name-shadow-mode: t
>   global-font-lock-mode: t
>   font-lock-mode: t
>   blink-cursor-mode: t
>   auto-composition-mode: t
>   auto-encryption-mode: t
>   auto-compression-mode: t
>   temp-buffer-resize-mode: t
>   line-number-mode: t
>   abbrev-mode: t
> 
> Recent input:
> <delete> <delete> <delete> <delete> <delete> <delete> 
> <delete> <delete> <delete> <delete> t h e SPC o t h 
> e r SPC p o s s i b l e SPC r e a s i n SPC <backspace> 
> <backspace> <backspace> o n SPC i s SPC t h a t M-q 
> <C-right> <C-right> <C-right> M-d <C-right> <C-right> 
> SPC ( n o t SPC i n s t a l l e d ) M-q <down> <down> 
> <C-home> C-c C-s <switch-frame> d SPC M-z M-z M-z M-z 
> M-z M-z M-z M-z M-z M-z M-z M-z M-z C-z C-z C-z C-z 
> C-z C-z C-z C-z C-z C-z C-z C-z C-z C-z C-z C-z C-z 
> C-z C-z C-z C-z C-z C-z C-z C-z C-z C-z C-z C-z C-z 
> C-z C-z C-z C-z C-z C-z C-z C-z C-z C-z M-z n o G N 
> U W <tab> <return> SPC M-z n d SPC SPC d SPC d p p 
> p p p p p p n n n n n C-z C-z C-z C-z C-z C-z C-z C-z 
> <switch-frame> <help-echo> <switch-frame> <help-echo> 
> <switch-frame> <switch-frame> <C-home> f n e s s SPC 
> <backspace> <down> <down> <down> <down> <down> C h 
> e c k SPC t h i s SPC o u t . C-c C-s C-g C-x 1 <down> 
> <down> <down> <down> <down> <down> <down> <down> <down> 
> <down> <down> C-x <return> f <return> C-c C-s <switch-frame> 
> n SPC o P O <tab> <return> SPC n p p p p p p p p p 
> p p p n n n n n n n n n n n n n n n n n n n n n n n 
> n n n n <help-echo> <switch-frame> <help-echo> <help-echo> 
> <help-echo> <help-echo> <switch-frame> C-x C-s <switch-frame> 
> M-x r e p o r t - e m <tab> <return>
> 
> Recent messages:
> Quit
> Sending...
> Added to d:/usr/eli/rmail/SENT.MAIL
> Sending email 
> Sending email done
> Sending...done
> Added to d:/usr/eli/rmail/PORTS.rmail
> No following nondeleted message [16 times]
> Saving file d:/usr/eli/rmail/INBOX...
> Wrote d:/usr/eli/rmail/INBOX [2 times]
> 
> Load-path shadows:
> None found.
> 
> Features:
> (shadow emacsbug find-func multi-isearch help-mode view dabbrev
> network-stream starttls tls smtpmail auth-source eieio assoc gnus-util
> password-cache mailalias sendmail rmailout ld-script sh-script
> executable dired-x dired tcl nxml-uchnm rng-xsd xsd-regexp rng-cmpct
> rng-nxml rng-valid rng-loc rng-uri rng-parse nxml-parse rng-match
> rng-dt rng-util rng-pttrn nxml-ns nxml-mode nxml-outln nxml-rap
> nxml-util nxml-glyph nxml-enc xmltok sgml-mode org-wl org-w3m org-vm
> org-rmail org-mhe org-mew org-irc org-jsinfo org-infojs org-html
> org-exp ob-exp org-exp-blocks org-agenda org-info org-gnus org-docview
> org-bibtex bibtex org-bbdb org byte-opt warnings bytecomp byte-compile
> cconv macroexp advice help-fns advice-preload ob-emacs-lisp ob-tangle
> ob-ref ob-lob ob-table org-footnote org-src ob-comint ob-keys ob
> ob-eval org-pcomplete pcomplete comint ring org-list org-faces
> org-compat org-entities org-macs cal-menu calendar cal-loaddefs
> noutline outline arc-mode archive-mode jka-compr flyspell ispell
> autorevert diff-mode easy-mmode make-mode conf-mode newcomment generic
> parse-time vc-cvs info vc-bzr cc-mode cc-fonts cc-guess cc-menus
> cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs regexp-opt
> rmailsum qp rmailmm message format-spec rfc822 mml easymenu mml-sec
> mm-decode mm-bodies mm-encode mailabbrev gmm-utils mailheader
> mail-parse rfc2231 rmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
> mail-utils desktop server filecache saveplace midnight generic-x paren
> battery time time-date tooltip ediff-hook vc-hooks lisp-float-type
> mwheel dos-w32 disp-table ls-lisp w32-win w32-vars tool-bar dnd
> fontset image fringe lisp-mode register page menu-bar rfn-eshadow
> timer select scroll-bar mouse jit-lock font-lock syntax facemenu
> font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan
> thai tai-viet lao korean japanese hebrew greek romanian slovak czech
> european ethiopic indian cyrillic chinese case-table epa-hook
> jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces
> cus-face files text-properties overlay sha1 md5 base64 format env
> code-pages mule custom widget hashtable-print-readable backquote
> make-network-process multi-tty emacs)
> 
> 
> [2:application/octet-stream Show Save:socket.c (55kB)]
>