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bug#17753: Cygwin emacs-X11 core dump

From: markus . hoenicka
Subject: bug#17753: Cygwin emacs-X11 core dump
Date: Mon, 9 Jun 2014 23:55:32 +0200


I had to upgrade my box at work from Windows XP to Windows 7. The
latter runs the 64 bit version of Cygwin, whereas the former ran the
32 bit version. I've never experienced any Emacs crashes of the 32 bit
version in years. Since upgrading I noticed approx. one crash per
day. As suggested on the Cygwin list [1], I've upgraded to a test
release of Emacs. The crash frequency is now close to once in two
weeks. As I started to collect crash data only about two weeks ago, it
is too early to search for patterns or for ways to reproduce the
crashes. This is also why I can't offer backtraces after starting
Emacs with the -Q switch. I hope that someone can make sense of the
backtrace data anyway.

I'll be happy to provide further information and run tests if needed.


System information
Windows 7 Professional Ver 6.1 Build 7601 Service Pack 1
uname -a output:
CYGWIN_NT-6.1 SBHC123 1.7.29(0.272/5/3) 2014-04-07 13:46 x86_64 Cygwin

Installed Emacs packages:
emacs                                 24.3.90-1
emacs-debuginfo                       24.3.90-1
emacs-el                              24.3.90-1
emacs-X11                             24.3.90-1

In GNU Emacs (x86_64-unknown-cygwin, GTK+ Version 3.10.7)
of 2014-05-03 on fiona
Windowing system distributor `The Cygwin/X Project', version 11.0.11501000
Configured using:
--prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin
--libexecdir=/usr/libexec --datadir=/usr/share --localstatedir=/var
--sysconfdir=/etc --libdir=/usr/lib --datarootdir=/usr/share
--docdir=/usr/share/doc/emacs --htmldir=/usr/share/doc/emacs/html -C
--without-gconf --without-gsettings 'CFLAGS=-ggdb -O2 -pipe
-Wimplicit-function-declaration -O0
CPPFLAGS= LDFLAGS=-Wl,--stack,0x400000'

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

Major mode: Fundamental

Minor modes in effect:
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-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

(shadow mail-extr emacsbug message rfc822 mml mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
sendmail rfc2047 rfc2045 ietf-drums mail-utils wrolo-menu lmenu noutline
outline help-mode mule-util cal-move warnings erc-list erc-menu erc-join
erc-ring erc-networks erc-pcomplete pcomplete comint ansi-color ring
erc-track erc-match erc-button erc-fill erc-stamp erc-netsplit
erc-goodies erc erc-backend erc-compat format-spec auth-source eieio
byte-opt bytecomp byte-compile cconv eieio-core gnus-util mm-util
mail-prsvr password-cache thingatpt pp muse-backlink planner-cyclic
diary-lib diary-loaddefs planner-publish muse-xml planner advice
help-fns sort muse-colors muse-html muse-xml-common muse-publish
muse-project muse-protocols info muse-regexps muse muse-nested-tags
muse-mode wrolo htz cal-julian cal-menu calendar cal-loaddefs hmail
hversion hfyview cl-macs gv htmlfontify cus-edit cus-start cus-load
wid-edit cl cl-loaddefs cl-lib refdb-output-mode derived refdb-mode
easy-mmode easymenu server time-date tooltip electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
prog-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 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 make-network-process
dbusbind gfilenotify dynamic-setting font-render-setting move-toolbar
gtk x-toolkit x multi-tty emacs)

How to reproduce
This is the tricky part as mentioned above. On the occasion recorded
below I was simply typing text.


(gdb) bt full
#0  0x0000003300001fa4 in ?? ()
No symbol table info available.
#1  0x0000000100a49832 in bss_sbrk_buffer ()
No symbol table info available.
#2  0x000000000042ccf0 in ?? ()
No symbol table info available.
#3  0x0000000000000004 in ?? ()
No symbol table info available.
#4  0x0000000101013c48 in bss_sbrk_buffer ()
No symbol table info available.
#5  0x0000000000425170 in ?? ()
No symbol table info available.
#6  0x000000010052b64d in CHAR_TABLE_REF (
    ct=<error reading variable: Cannot access memory at address 
    address@hidden<error reading variable: Cannot access memory at address 
    idx=<error reading variable: Cannot access memory at address 
0x4251a000000018>) at /usr/src/debug/emacs-24.3.90-1/src/lisp.h:1468
No locals.
(gdb) xbacktrace
Undefined command: "xbacktrace".  Try "help".

[1] https://cygwin.com/ml/cygwin/2014-05/msg00047.html

Markus Hoenicka
AQ score 38

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