Package: emacs;
Reported by: Eli Zaretskii <eliz <at> gnu.org>
Date: Sun, 15 Oct 2017 16:09:01 UTC
Severity: normal
Found in versions 27.0.50, 26.0.90
Done: Alan Mackenzie <acm <at> muc.de>
Bug is archived. No further changes may be made.
Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: bug-gnu-emacs <at> gnu.org, Alan Mackenzie <acm <at> muc.de> Subject: 26.0.90; Error running timer 'jit-lock-stealth-fontify': (error "Invalid search bound (wrong side of point)") Date: Sun, 15 Oct 2017 19:07:50 +0300
This bug is bugging me for quite some time now, and my hopes for it to
be resolved are now gone, so I finally sat down to debug it.
I have jit-lock-stealth turned on in my sessions, so whenever I
restart Emacs (e.g., when I build a new binary, or after a system
restart), and restore my session using desktop.el, Emacs starts
fontifying in the background. At some point, sometimes more than
once, I get this error:
Error running timer 'jit-lock-stealth-fontify': (error "Invalid search bound (wrong side of point)")
Today I ran Emacs under a debugger, and caught this error. The
details are below, but in a nutshell, CC mode's fontification
functions call re-search-forward with BOUND that is before point. I
hope the data below is enough to understand why that happens and fix
it; if not, please tell what additional data is needed to diagnose the
problem.
Here're the C and Lisp backtraces from the error, and some relevant
data that explains why the error happened:
Thread 1 hit Breakpoint 5, search_command (string=...,
bound=make_number(123806), noerror=..., count=...,
direction=direction <at> entry=1, RE=RE <at> entry=1, posix=posix <at> entry=false)
at search.c:1046
1046 error ("Invalid search bound (wrong side of point)");
(gdb) bt
#0 search_command (string=..., bound=make_number(123806), noerror=...,
count=..., direction=direction <at> entry=1, RE=RE <at> entry=1,
posix=posix <at> entry=false) at search.c:1046
#1 0x011cd2c9 in Fre_search_forward (regexp=XIL(0x800000000ad97598),
bound=..., noerror=..., count=...) at search.c:2271
#2 0x0121f9f0 in funcall_subr (subr=<optimized out>,
subr <at> entry=0x137fc48 <Sre_search_forward>, numargs=<optimized out>,
numargs <at> entry=3, args=<optimized out>, args <at> entry=0x8898d0) at eval.c:2849
#3 0x0121ddc6 in Ffuncall (nargs=nargs <at> entry=4, args=args <at> entry=0x8898c8)
at eval.c:2766
#4 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000ad526b8),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=0, args=<optimized out>, args <at> entry=0x0) at bytecode.c:629
#5 0x0121d94f in funcall_lambda (fun=..., nargs=nargs <at> entry=4,
arg_vector=arg_vector <at> entry=0x889ed0) at eval.c:3049
#6 0x0121de35 in Ffuncall (nargs=nargs <at> entry=5, args=args <at> entry=0x889ec8)
at eval.c:2768
#7 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000ad97558),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=0, args=<optimized out>, args <at> entry=0x0) at bytecode.c:629
#8 0x0121d94f in funcall_lambda (fun=..., nargs=nargs <at> entry=1,
arg_vector=arg_vector <at> entry=0x88a410) at eval.c:3049
#9 0x0121de35 in Ffuncall (nargs=nargs <at> entry=2, args=args <at> entry=0x88a408)
at eval.c:2768
#10 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000add7b70),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=0, args=<optimized out>, args <at> entry=0x0) at bytecode.c:629
#11 0x0121d94f in funcall_lambda (fun=..., nargs=nargs <at> entry=5,
arg_vector=arg_vector <at> entry=0x88a980) at eval.c:3049
#12 0x0121de35 in Ffuncall (nargs=nargs <at> entry=6, args=args <at> entry=0x88a978)
at eval.c:2768
#13 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000add8368),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=0, args=<optimized out>, args <at> entry=0x0) at bytecode.c:629
#14 0x0121d94f in funcall_lambda (fun=..., nargs=nargs <at> entry=5,
arg_vector=arg_vector <at> entry=0x88ae50) at eval.c:3049
#15 0x0121de35 in Ffuncall (nargs=nargs <at> entry=6, args=args <at> entry=0x88ae48)
at eval.c:2768
#16 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000add83e8),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=0, args=<optimized out>, args <at> entry=0x0) at bytecode.c:629
#17 0x0121d94f in funcall_lambda (fun=..., nargs=nargs <at> entry=3,
arg_vector=arg_vector <at> entry=0x88b310) at eval.c:3049
#18 0x0121de35 in Ffuncall (nargs=nargs <at> entry=4, args=args <at> entry=0x88b308)
at eval.c:2768
#19 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000ad54fe0),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=0, args=<optimized out>, args <at> entry=0x0) at bytecode.c:629
#20 0x0121d94f in funcall_lambda (fun=..., nargs=nargs <at> entry=4,
arg_vector=arg_vector <at> entry=0x88c040) at eval.c:3049
#21 0x0121de35 in Ffuncall (nargs=nargs <at> entry=5, args=args <at> entry=0x88c038)
at eval.c:2768
#22 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000add83c8),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=0, args=<optimized out>, args <at> entry=0x0) at bytecode.c:629
#23 0x0121d94f in funcall_lambda (fun=..., nargs=nargs <at> entry=1,
arg_vector=arg_vector <at> entry=0x88c410) at eval.c:3049
#24 0x0121de35 in Ffuncall (nargs=nargs <at> entry=2, args=args <at> entry=0x88c408)
at eval.c:2768
#25 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000146ae20),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=0, args=<optimized out>, args <at> entry=0x0) at bytecode.c:629
#26 0x0121d94f in funcall_lambda (fun=..., nargs=nargs <at> entry=3,
arg_vector=arg_vector <at> entry=0x88ca70) at eval.c:3049
#27 0x0121de35 in Ffuncall (nargs=nargs <at> entry=4, args=args <at> entry=0x88ca68)
at eval.c:2768
#28 0x0129445c in exec_byte_code (bytestr=XIL(0x8000000001469d78),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=0, args=<optimized out>, args <at> entry=0x0) at bytecode.c:629
#29 0x0121d94f in funcall_lambda (fun=..., nargs=nargs <at> entry=3,
arg_vector=arg_vector <at> entry=0x88ce60) at eval.c:3049
#30 0x0121de35 in Ffuncall (nargs=nargs <at> entry=4, args=args <at> entry=0x88ce58)
at eval.c:2768
#31 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000adad4c0),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=0, args=<optimized out>, args <at> entry=0x0) at bytecode.c:629
#32 0x0121d94f in funcall_lambda (fun=..., nargs=nargs <at> entry=3,
arg_vector=arg_vector <at> entry=0x88d230) at eval.c:3049
#33 0x0121de35 in Ffuncall (nargs=nargs <at> entry=4, args=args <at> entry=0x88d228)
at eval.c:2768
#34 0x0129445c in exec_byte_code (bytestr=XIL(0x8000000001469798),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=0, args=<optimized out>, args <at> entry=0x0) at bytecode.c:629
#35 0x0121d94f in funcall_lambda (fun=..., nargs=nargs <at> entry=2,
arg_vector=arg_vector <at> entry=0x88d578) at eval.c:3049
#36 0x0121de35 in Ffuncall (nargs=nargs <at> entry=3, args=args <at> entry=0x88d570)
at eval.c:2768
#37 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000146d9a8),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=1, args=<optimized out>, args <at> entry=0x88daf8)
at bytecode.c:629
#38 0x0121d467 in funcall_lambda (fun=..., nargs=nargs <at> entry=1,
arg_vector=arg_vector <at> entry=0x88daf8) at eval.c:2967
#39 0x0121de35 in Ffuncall (nargs=nargs <at> entry=2, args=args <at> entry=0x88daf0)
at eval.c:2768
#40 0x0121dfff in run_hook_wrapped_funcall (nargs=2, args=0x88daf0)
at eval.c:2493
#41 0x0121b1e2 in run_hook_with_args (nargs=nargs <at> entry=2,
args=args <at> entry=0x88daf0,
funcall=funcall <at> entry=0x121dfcf <run_hook_wrapped_funcall>) at eval.c:2574
#42 0x0121b38b in Frun_hook_wrapped (nargs=2, args=0x88daf0) at eval.c:2508
#43 0x0121f8f8 in funcall_subr (
subr=subr <at> entry=0x167d5c8 <Srun_hook_wrapped>, numargs=numargs <at> entry=2,
args=args <at> entry=0x88daf0) at eval.c:2821
#44 0x0121ddc6 in Ffuncall (nargs=nargs <at> entry=3, args=args <at> entry=0x88dae8)
at eval.c:2766
#45 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000146d938),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=2, args=<optimized out>, args <at> entry=0x88dee0)
at bytecode.c:629
#46 0x0121d467 in funcall_lambda (fun=..., nargs=nargs <at> entry=2,
arg_vector=arg_vector <at> entry=0x88dee0) at eval.c:2967
#47 0x0121de35 in Ffuncall (nargs=nargs <at> entry=3, args=args <at> entry=0x88ded8)
at eval.c:2768
#48 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000146da00),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=2, args=<optimized out>, args <at> entry=0x88e3e0)
at bytecode.c:629
#49 0x0121d467 in funcall_lambda (fun=..., nargs=nargs <at> entry=2,
arg_vector=arg_vector <at> entry=0x88e3e0) at eval.c:2967
#50 0x0121de35 in Ffuncall (nargs=nargs <at> entry=3, args=args <at> entry=0x88e3d8)
at eval.c:2768
#51 0x0129445c in exec_byte_code (bytestr=XIL(0x800000000146dc90),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=1, args=<optimized out>, args <at> entry=0x88e9d0)
at bytecode.c:629
#52 0x0121d467 in funcall_lambda (fun=..., nargs=nargs <at> entry=1,
arg_vector=arg_vector <at> entry=0x88e9d0) at eval.c:2967
#53 0x0121de35 in Ffuncall (nargs=nargs <at> entry=2, args=args <at> entry=0x88e9c8)
at eval.c:2768
#54 0x01220d8a in Fapply (nargs=2, args=0x88e9c8) at eval.c:2343
#55 0x0121f8f8 in funcall_subr (subr=subr <at> entry=0x167d668 <Sapply>,
numargs=numargs <at> entry=2, args=args <at> entry=0x88e9c8) at eval.c:2821
#56 0x0121ddc6 in Ffuncall (nargs=nargs <at> entry=3, args=args <at> entry=0x88e9c0)
at eval.c:2766
#57 0x0129445c in exec_byte_code (bytestr=XIL(0x80000000014770f8),
vector=..., maxdepth=..., args_template=..., nargs=<optimized out>,
nargs <at> entry=1, args=<optimized out>, args <at> entry=0x88edb8)
at bytecode.c:629
#58 0x0121d467 in funcall_lambda (fun=..., nargs=nargs <at> entry=1,
arg_vector=arg_vector <at> entry=0x88edb8) at eval.c:2967
#59 0x0121de35 in Ffuncall (nargs=nargs <at> entry=2, args=args <at> entry=0x88edb0)
at eval.c:2768
#60 0x0121e088 in call1 (fn=XIL(0xf1f0), arg1=...) at eval.c:2617
#61 0x0114a180 in timer_check_2 (timers=..., idle_timers=...)
at keyboard.c:4462
#62 0x01150644 in timer_check () at keyboard.c:4524
#63 0x0115069a in readable_events (flags=flags <at> entry=1) at keyboard.c:3340
#64 0x011594d2 in get_input_pending (flags=flags <at> entry=1) at keyboard.c:6824
#65 0x011596b9 in detect_input_pending_run_timers (
do_display=do_display <at> entry=true) at keyboard.c:9951
#66 0x012a9223 in wait_reading_process_output (time_limit=<optimized out>,
nsecs=<optimized out>, nsecs <at> entry=0, read_kbd=<optimized out>,
read_kbd <at> entry=-1, do_display=<optimized out>, wait_for_cell=...,
wait_proc=<optimized out>, wait_proc <at> entry=0x0,
just_wait_proc=<optimized out>, just_wait_proc <at> entry=0) at process.c:5504
#67 0x01159b56 in kbd_buffer_get_event (kbp=kbp <at> entry=0x88f47c,
used_mouse_menu=used_mouse_menu <at> entry=0x88f7c3,
end_time=end_time <at> entry=0x0) at keyboard.c:3831
#68 0x0115aab4 in read_event_from_main_queue (end_time=end_time <at> entry=0x0,
local_getcjmp=local_getcjmp <at> entry=0x88f670,
used_mouse_menu=used_mouse_menu <at> entry=0x88f7c3) at keyboard.c:2151
#69 0x0115ae38 in read_decoded_event_from_main_queue (
end_time=end_time <at> entry=0x0, local_getcjmp=local_getcjmp <at> entry=0x88f670,
prev_event=XIL(0), used_mouse_menu=used_mouse_menu <at> entry=0x88f7c3)
at keyboard.c:2214
#70 0x0115c9ff in read_char (commandflag=1, map=..., prev_event=...,
used_mouse_menu=used_mouse_menu <at> entry=0x88f7c3,
end_time=end_time <at> entry=0x0) at keyboard.c:2802
#71 0x0115e6be in read_key_sequence (keybuf=keybuf <at> entry=0x88f870,
bufsize=bufsize <at> entry=30, prompt=XIL(0xfb938800000000),
dont_downcase_last=dont_downcase_last <at> entry=false,
can_return_switch_frame=can_return_switch_frame <at> entry=true,
fix_current_buffer=fix_current_buffer <at> entry=true,
prevent_redisplay=prevent_redisplay <at> entry=false) at keyboard.c:9147
#72 0x01161825 in command_loop_1 () at keyboard.c:1368
#73 0x0121a98e in internal_condition_case (
bfun=bfun <at> entry=0x1161517 <command_loop_1>, handlers=...,
hfun=hfun <at> entry=0x114d246 <cmd_error>) at eval.c:1332
#74 0x01142ce3 in command_loop_2 (ignore=XIL(0)) at keyboard.c:1110
#75 0x0121a8f0 in internal_catch (tag=XIL(0xf538),
func=func <at> entry=0x1142cbc <command_loop_2>, arg=...) at eval.c:1097
#76 0x01142c8b in command_loop () at keyboard.c:1089
#77 0x0114cba6 in recursive_edit_1 () at keyboard.c:695
#78 0x0114cff7 in Frecursive_edit () at keyboard.c:766
#79 0x01141ab3 in main (argc=<optimized out>, argv=<optimized out>)
at emacs.c:1713
Lisp Backtrace:
"re-search-forward" (0x8898d0)
"c-syntactic-re-search-forward" (0x889ed0)
"c-forward-declarator" (0x88a410)
"c-font-lock-declarators" (0x88a980)
"c-font-lock-single-decl" (0x88ae50)
0xad881a0 PVEC_COMPILED
"c-find-decl-spots" (0x88c040)
"c-font-lock-declarations" (0x88c410)
"font-lock-fontify-keywords-region" (0x88ca70)
"font-lock-default-fontify-region" (0x88ce60)
"c-font-lock-fontify-region" (0x88d230)
"font-lock-fontify-region" (0x88d578)
0x83d89a8 PVEC_COMPILED
"run-hook-wrapped" (0x88daf0)
"jit-lock--run-functions" (0x88dee0)
"jit-lock-fontify-now" (0x88e3e0)
"jit-lock-stealth-fontify" (0x88e9d0)
"apply" (0x88e9c8)
"timer-event-handler" (0x88edb8)
(gdb) p n
$1 = 1
(gdb) p lim
$2 = <optimized out>
(gdb) pp bound
123806
(gdb) p PT
$3 = 123811
So point is 123811 and the BOUND argument of re-search-forward is
123806, too small.
(gdb) up
#1 0x011cd2c9 in Fre_search_forward (regexp=XIL(0x800000000ad97598),
bound=..., noerror=..., count=...) at search.c:2271
2271 return search_command (regexp, bound, noerror, count, 1, 1, 0);
(gdb) pp regexp
"[;:,]\\|\\s)\\|\\(=\\|\\s(\\)"
(gdb) p current_buffer
$4 = (struct buffer *) 0xb362590
(gdb) pp current_buffer->name_
"process.c"
These are the regexp argument to re-search-forward and the buffer
which was being fontified.
The problem happens in c-syntactic-re-search-forward in this snippet:
(condition-case err
(while
(and
(progn
(setq search-pos (point))
(if (re-search-forward regexp bound noerror) <<<<<<<<<<<
t
;; Without the following, when PAREN-LEVEL is non-nil, and
;; NOERROR is not nil or t, and the very first search above
;; has just failed, point would end up at BOUND rather than
;; just before the next close paren.
(when (and (eq search-pos start)
paren-level
(not (memq noerror '(nil t))))
(setq state (parse-partial-sexp start bound -1))
(if (eq (car state) -1)
(setq bound (1- (point)))))
nil))
This is called from c-forward-declarator:
;; Search syntactically to the end of the declarator (";",
;; ",", a closing paren, eob etc) or to the beginning of an
;; initializer or function prototype ("=" or "\\s\(").
;; Note that square brackets are now not also treated as
;; initializers, since this broke when there were also
;; initializing brace lists.
(let (found)
(while
(and (progn
;; In the next loop, we keep searching forward whilst
;; we find ":"s which aren't single colons inside C++
;; "for" statements.
(while
(and
(setq found
(c-syntactic-re-search-forward <<<<<<<<<<<
"[;:,]\\|\\s)\\|\\(=\\|\\s(\\)"
limit t t))
It looks like c-syntactic-re-search-forward calls re-search-forward in
a loop, but perhaps it fails to update the limit to be in sync with
point that moves as the search proceeds?
Let me know what other data I can provide to help fix this annoying
problem.
In GNU Emacs 26.0.90 (build 1, i686-pc-mingw32)
of 2017-10-12 built on HOME-C4E4A596F7
Windowing system distributor 'Microsoft Corp.', version 5.1.2600
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Configured using:
'configure --prefix=/d/usr --with-wide-int --with-modules
--enable-checking=yes,glyphs 'CFLAGS=-Og -gdwarf-4 -g3''
Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS MODULES LCMS2
Important settings:
value of $LANG: ENU
locale-coding-system: cp1255
Major mode: Lisp Interaction
Minor modes in effect:
tooltip-mode: t
global-eldoc-mode: t
eldoc-mode: t
electric-indent-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
line-number-mode: t
transient-mark-mode: t
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv cl-loaddefs cl-lib dired dired-loaddefs
format-spec rfc822 mml easymenu mml-sec password-cache epa derived epg
epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils elec-pair time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel dos-w32 ls-lisp disp-table term/w32-win w32-win
w32-vars term/common-win tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote w32notify w32 lcms2 multi-tty make-network-process emacs)
Memory information:
((conses 16 100974 11112)
(symbols 56 21280 1)
(miscs 48 40 107)
(strings 16 31517 1999)
(string-bytes 1 759703)
(vectors 16 14009)
(vector-slots 8 645650 16134)
(floats 8 51 226)
(intervals 40 268 103)
(buffers 880 11))
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