GNU bug report logs - #7740
Crash calling substring on a menu string in post-command-hook (w32)

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Lennart Borgman <lennart.borgman <at> gmail.com>
Subject: bug#7740: closed (Re: bug#7740: Crash calling substring on a menu
 string in post-command-hook (w32))
Date: Sun, 17 Feb 2013 03:17:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#7740: Crash calling substring on a menu string in post-command-hook (w32)

which was filed against the emacs,w32 package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 7740 <at> debbugs.gnu.org.

-- 
7740: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7740
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Glenn Morris <rgm <at> gnu.org>
To: 7740-done <at> debbugs.gnu.org
Subject: Re: bug#7740: Crash calling substring on a menu string in
	post-command-hook (w32)
Date: Sat, 16 Feb 2013 22:15:43 -0500

Sorry no-one ever replied. After so much time, I don't think we can do
anything without a recipe to reproduce this issue, or a live GDB
session. If it happens again with the current version of Emacs
(currently 24.2), please make a new report and hopefully we do better
next time.

[Message part 3 (message/rfc822, inline)]

From: Lennart Borgman <lennart.borgman <at> gmail.com>
To: Emacs Bugs <bug-gnu-emacs <at> gnu.org>
Subject: Crash calling substring on a menu string in post-command-hook (w32)
Date: Mon, 27 Dec 2010 05:24:42 +0100

A new crash, related to menu handling. It occurs in post-command-hook
while grabbing a substring from a string returned by tmm (or a
slightly modified version of it).

I notice that so far most of the crashes I have seen earlier has been
related to the system. I wonder if this one is it too in some way.
(Could the menu strings have been changed in some ways by the system
calls?)

I can't find much information. Below is the backtrace and the few
variable I know how to get. (The library menuacc is in the repository
for nXhtml. I see no reason to copy part of the code here.)

My patched version:

GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600) from trunk 2010-10-19 on
LENNART-69DE564 (patched)


(gdb) p i
$1 = (INTERVAL) 0x55bb290
(gdb) p old_diff
$2 = 48345856
(gdb) p new_diff
$3 = 67373824
(gdb)


Program received signal SIGSEGV, Segmentation fault.
0x011ddddd in balance_an_interval (i=0x55bb290) at intervals.c:410
410           old_diff = LEFT_TOTAL_LENGTH (i) - RIGHT_TOTAL_LENGTH (i);
(gdb) bt
#0  0x011ddddd in balance_an_interval (i=0x55bb290) at intervals.c:410
#1  0x011de39a in balance_possible_root_interval (interval=0x55bb290)
    at intervals.c:454
#2  0x011de5b7 in find_interval (tree=0x55bb290, position=0)
    at intervals.c:639
#3  0x01193b4f in validate_interval_range (object=68189697, begin=0x82c9c0,
    end=0x82c9c4, force=0) at textprop.c:183
#4  0x01197687 in copy_text_properties (start=0, end=12, src=68189697, pos=0,
    dest=63578305, prop=45488154) at textprop.c:1830
#5  0x010459af in Fsubstring (string=68189697, from=0, to=12) at fns.c:1189
#6  0x0102058e in Feval (form=48161934) at eval.c:2358
#7  0x010204b1 in Feval (form=48161918) at eval.c:2337
#8  0x0101d20b in Fand (args=48161974) at eval.c:319
#9  0x01020299 in Feval (form=48161862) at eval.c:2297
#10 0x0101d247 in Fif (args=63290438) at eval.c:341
#11 0x01020299 in Feval (form=63290430) at eval.c:2297
#12 0x0102081b in Feval (form=48161854) at eval.c:2410
#13 0x0101d33d in Fprogn (args=48162078) at eval.c:395
#14 0x01020299 in Feval (form=48161846) at eval.c:2297
#15 0x0101d26a in Fif (args=48161838) at eval.c:345
#16 0x01020299 in Feval (form=48161814) at eval.c:2297
#17 0x0101d33d in Fprogn (args=62617958) at eval.c:395
#18 0x01020299 in Feval (form=63290790) at eval.c:2297
#19 0x0101d26a in Fif (args=63290774) at eval.c:345
#20 0x01020299 in Feval (form=63290766) at eval.c:2297
#21 0x0102081b in Feval (form=48163518) at eval.c:2410
#22 0x0101d33d in Fprogn (args=48161150) at eval.c:395
#23 0x0101e526 in Flet (args=48163510) at eval.c:1052
#24 0x01020299 in Feval (form=48163390) at eval.c:2297
#25 0x0101d33d in Fprogn (args=63527430) at eval.c:395
#26 0x01021d38 in funcall_lambda (fun=63527382, nargs=1, arg_vector=0x82d93c)
    at eval.c:3167
#27 0x01021863 in Ffuncall (nargs=2, args=0x82d938) at eval.c:3047
#28 0x010210c9 in call1 (fn=63527382, arg1=46608126) at eval.c:2789
#29 0x01048a07 in mapcar1 (leni=13, vals=0x0, fn=63527382, seq=63715758)
    at fns.c:2356
#30 0x01048dad in Fmapc (function=63527382, sequence=63715758) at fns.c:2445
#31 0x0102055e in Feval (form=48163326) at eval.c:2355
#32 0x0101d33d in Fprogn (args=63528414) at eval.c:395
#33 0x0101e600 in Fwhile (args=63528398) at eval.c:1074
#34 0x01020299 in Feval (form=63528094) at eval.c:2297
#35 0x0101d33d in Fprogn (args=63528086) at eval.c:395
#36 0x0101e526 in Flet (args=63527902) at eval.c:1052
#37 0x01020299 in Feval (form=63527734) at eval.c:2297
#38 0x0101d33d in Fprogn (args=63527526) at eval.c:395
#39 0x0101e89e in internal_catch (tag=56118802, func=0x101d314 <Fprogn>,
    arg=63527526) at eval.c:1204
#40 0x0101e809 in Fcatch (args=63527478) at eval.c:1175
#41 0x01020299 in Feval (form=63527470) at eval.c:2297
#42 0x010204b1 in Feval (form=63527438) at eval.c:2337
#43 0x0102081b in Feval (form=63527534) at eval.c:2410
#44 0x0102081b in Feval (form=48163262) at eval.c:2410
#45 0x0101d33d in Fprogn (args=63836654) at eval.c:395
#46 0x0101e600 in Fwhile (args=63835942) at eval.c:1074
#47 0x01020299 in Feval (form=63835918) at eval.c:2297
#48 0x0101d33d in Fprogn (args=63835630) at eval.c:395
#49 0x0101e526 in Flet (args=63835622) at eval.c:1052
#50 0x01020299 in Feval (form=63729254) at eval.c:2297
#51 0x0101d33d in Fprogn (args=62617102) at eval.c:395
#52 0x0101e89e in internal_catch (tag=56118802, func=0x101d314 <Fprogn>,
    arg=62617102) at eval.c:1204
#53 0x0101e809 in Fcatch (args=63462958) at eval.c:1175
#54 0x01020299 in Feval (form=63462934) at eval.c:2297
#55 0x010204b1 in Feval (form=63462486) at eval.c:2337
#56 0x0102081b in Feval (form=63729030) at eval.c:2410
#57 0x0102081b in Feval (form=48163190) at eval.c:2410
#58 0x0101d33d in Fprogn (args=48161198) at eval.c:395
#59 0x0101e526 in Flet (args=48163126) at eval.c:1052
#60 0x01020299 in Feval (form=48162942) at eval.c:2297
#61 0x0101d33d in Fprogn (args=48161206) at eval.c:395
#62 0x01020299 in Feval (form=48162934) at eval.c:2297
#63 0x0101d33d in Fprogn (args=48161214) at eval.c:395
#64 0x01021d38 in funcall_lambda (fun=48161222, nargs=1, arg_vector=0x82f0c0)
    at eval.c:3167
#65 0x01021a4e in apply_lambda (fun=48161222, args=48161286, eval_flag=1)
    at eval.c:3100
#66 0x01020845 in Feval (form=48161278) at eval.c:2412
#67 0x0101d33d in Fprogn (args=48161294) at eval.c:395
#68 0x01021d38 in funcall_lambda (fun=48161534, nargs=1, arg_vector=0x82f300)
    at eval.c:3167
#69 0x01021a4e in apply_lambda (fun=48161534, args=48159886, eval_flag=1)
    at eval.c:3100
#70 0x01020845 in Feval (form=48159878) at eval.c:2412
#71 0x0101d33d in Fprogn (args=48159894) at eval.c:395
#72 0x0101e526 in Flet (args=48159806) at eval.c:1052
#73 0x01020299 in Feval (form=48161758) at eval.c:2297
#74 0x0101eca3 in internal_lisp_condition_case (var=45733034,
    bodyform=48161758, handlers=48159966) at eval.c:1407
#75 0x0101eac5 in Fcondition_case (args=48161750) at eval.c:1349
#76 0x01020299 in Feval (form=48161742) at eval.c:2297
#77 0x0101d33d in Fprogn (args=48159974) at eval.c:395
#78 0x01021d38 in funcall_lambda (fun=48159982, nargs=0, arg_vector=0x82fa38)
    at eval.c:3167
#79 0x01021863 in Ffuncall (nargs=1, args=0x82fa34) at eval.c:3047
#80 0x01020f02 in run_hook_with_args (nargs=1, args=0x82fa34,
    cond=to_completion) at eval.c:2679
#81 0x01020c95 in Frun_hooks (nargs=1, args=0x82faec) at eval.c:2542
#82 0x010214c1 in Ffuncall (nargs=2, args=0x82fae8) at eval.c:2971
#83 0x010210c9 in call1 (fn=45644402, arg1=45533738) at eval.c:2789
#84 0x01005b86 in safe_run_hooks_1 () at keyboard.c:2020
#85 0x0101edad in internal_condition_case (bfun=0x1005b53 <safe_run_hooks_1>,
    handlers=45488178, hfun=0x1005b8e <safe_run_hooks_error>) at eval.c:1460
#86 0x01005c26 in safe_run_hooks (hook=45533738) at keyboard.c:2046
#87 0x01004f02 in command_loop_1 () at keyboard.c:1743
#88 0x0101edad in internal_condition_case (bfun=0x10047e9 <command_loop_1>,
    handlers=45541738, hfun=0x10041de <cmd_error>) at eval.c:1460
#89 0x0100454e in command_loop_2 (ignore=45488154) at keyboard.c:1327
#90 0x0101e89e in internal_catch (tag=45539858,
    func=0x100452b <command_loop_2>, arg=45488154) at eval.c:1204
#91 0x01004506 in command_loop () at keyboard.c:1306
#92 0x01003dfa in recursive_edit_1 () at keyboard.c:929
#93 0x01003f5e in Frecursive_edit () at keyboard.c:991
#94 0x0100266f in main (argc=1, argv=0xa941b0) at emacs.c:1721

Lisp Backtrace:
"substring" (0x82ca60)
"string=" (0x82cc00)
"and" (0x82cd50)
"if" (0x82cea0)
"when" (0x82cfb0)
"progn" (0x82d100)
"if" (0x82d250)
"progn" (0x82d3a0)
"if" (0x82d4f0)
"when" (0x82d600)
"let" (0x82d7f0)
0x3c959d6 Lisp type 6
"mapc" (0x82da70)
"while" (0x82dcb0)
"let" (0x82dea0)
"catch" (0x82e0b0)
"cl-block-wrapper" (0x82e1c0)
"block" (0x82e2d0)
"dolist" (0x82e3e0)
"while" (0x82e590)
"let" (0x82e780)
"catch" (0x82e990)
"cl-block-wrapper" (0x82eaa0)
"block" (0x82ebb0)
"dolist" (0x82ecc0)
"let" (0x82eec0)
"progn" (0x82f010)
"menuacc-add-accel-1" (0x82f0c0)
"menuacc-add-accel" (0x82f300)
"let" (0x82f680)
"condition-case" (0x82f880)
"menuacc-add-accel-from-post-command-hook" (0x82fa38)
"run-hooks" (0x82faec)
(gdb)

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