bug#18162: 24.3.92; segfault on null face pointer in face_for_char

[Ken Raeburn]

Emacs crashed with a seg fault. I was typing into one of several X11
frames at the time, not doing anything particularly interesting as far
as I can tell. I think I was typing into the minibuffer. Unlike my other
crashes, this one doesn't seem to involve multiple displays at all; in
fact I don't think I used that session remotely since starting it.

My source is 24.3.92 plus:
 - Dmitry's patch to font.c (font_list_entities, font_matching_entity)
   to fix one of my earlier problems. 
 - Call delete_keyboard_wait_descriptor in x_connection_closed, before
   we clear dpyinfo->display.
 - Dmitry's patch to emacsclient to canonicalize the display name.

(gdb) bt
#0  0x00007f596c9fbb7b in raise (sig=<optimized out>) at 
../nptl/sysdeps/unix/sysv/linux/pt-raise.c:42
#1  0x0000000000519b25 in terminate_due_to_signal (sig=11, backtrace_limit=40) 
at emacs.c:378
#2  0x0000000000536dfe in handle_fatal_signal (sig=<optimized out>) at 
sysdep.c:1630
#3  0x0000000000536e63 in deliver_thread_signal (handler=0x536df0 
<handle_fatal_signal>, sig=11) at sysdep.c:1604
#4  deliver_fatal_thread_signal (sig=11) at sysdep.c:1642
#5  <signal handler called>
#6  face_for_char (f=0x66f0858, face=0x0, c=8230, pos=-1, object=13137010) at 
fontset.c:914
#7  0x0000000000619155 in Finternal_char_font (position=<optimized out>, 
ch=<optimized out>) at fontset.c:1863
#8  0x00000000005a16fe in Ffuncall (nargs=<optimized out>, args=0x7fffbcddcdd8) 
at eval.c:2818
#9  0x00000000005e055d in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=25, nargs=3, args=0x0) at bytecode.c:916
#10 0x00000000005a0f92 in funcall_lambda (fun=68493053, nargs=<optimized out>, 
arg_vector=0x7fffbcddcfa0) at eval.c:3049
#11 0x00000000005a1324 in Ffuncall (nargs=<optimized out>, args=0x7fffbcddcf98) 
at eval.c:2876
#12 0x00000000005e055d in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=127, nargs=2, args=0x0) at bytecode.c:916
#13 0x00000000005a0f92 in funcall_lambda (fun=55208949, nargs=<optimized out>, 
arg_vector=0x7fffbcddd180) at eval.c:3049
#14 0x00000000005a1324 in Ffuncall (nargs=<optimized out>, args=0x7fffbcddd178) 
at eval.c:2876
#15 0x00000000005e055d in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=20, nargs=5, args=0x0) at bytecode.c:916
#16 0x00000000005a08a2 in eval_sub (form=<optimized out>) at eval.c:2191
#17 0x000000000059f1a8 in internal_catch (tag=13137010, func=0x5a0010 
<eval_sub>, arg=55280886) at eval.c:1118
#18 0x00000000005e0816 in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=140736362042152, nargs=141, args=0x0) at bytecode.c:1097
#19 0x00000000005a08a2 in eval_sub (form=<optimized out>) at eval.c:2191
#20 0x00000000005a43f9 in internal_lisp_condition_case (var=13137010, 
bodyform=55280758, handlers=<optimized out>) at eval.c:1323
#21 0x00000000005e0a2f in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=140736362042680, nargs=143, args=0x0) at bytecode.c:1162
#22 0x00000000005a0f92 in funcall_lambda (fun=55208901, nargs=<optimized out>, 
arg_vector=0x7fffbcddd710) at eval.c:3049
#23 0x00000000005a1324 in Ffuncall (nargs=<optimized out>, args=0x7fffbcddd708) 
at eval.c:2876
#24 0x00000000005e055d in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=13137010, nargs=1, args=0x0) at bytecode.c:916
#25 0x00000000005a0f92 in funcall_lambda (fun=55206941, nargs=<optimized out>, 
arg_vector=0x7fffbcddd8b0) at eval.c:3049
#26 0x00000000005a1324 in Ffuncall (nargs=<optimized out>, args=0x7fffbcddd8a8) 
at eval.c:2876
#27 0x00000000005a19a8 in call0 (fn=54172594) at eval.c:2599
#28 0x000000000059f2a2 in internal_condition_case (bfun=0x51f110 
<safe_run_hooks_1>, handlers=<optimized out>, hfun=0x51cc40 
<safe_run_hooks_error>) at eval.c:1354
#29 0x000000000051cbd9 in safe_run_hook_funcall (nargs=<optimized out>, 
args=<optimized out>) at keyboard.c:1930
#30 0x000000000059f754 in run_hook_with_args (nargs=1, args=0x7fffbcddd958, 
funcall=0x51cb90 <safe_run_hook_funcall>) at eval.c:2551
#31 0x000000000052030f in safe_run_hooks (hook=54172594) at keyboard.c:1947
#32 0x000000000052b3e8 in command_loop_1 () at keyboard.c:1573
#33 0x000000000059f2a2 in internal_condition_case (bfun=0x52ae70 
<command_loop_1>, handlers=<optimized out>, hfun=0x5200f0 <cmd_error>) at 
eval.c:1354
#34 0x000000000051cc2e in command_loop_2 (ignore=<optimized out>) at 
keyboard.c:1177
#35 0x000000000059f1a8 in internal_catch (tag=13137010, func=0x51cc10 
<command_loop_2>, arg=13137010) at eval.c:1118
#36 0x000000000051fb7c in command_loop () at keyboard.c:1148
#37 recursive_edit_1 () at keyboard.c:777
#38 0x0000000000551271 in read_minibuf (map=77373078, initial=113165873, 
prompt=<optimized out>, expflag=false, histvar=<optimized out>, 
histpos=74575237, defalt=113165969, allow_props=false, 
inherit_input_method=false) at minibuf.c:674
#39 0x0000000000551a76 in Fread_from_minibuffer (prompt=9342561, 
initial_contents=113165873, keymap=77373078, read=13137010, hist=13204834, 
default_value=113165969, inherit_input_method=13137010) at minibuf.c:957
#40 0x00000000005a15b8 in Ffuncall (nargs=<optimized out>, args=0x7fffbcdddd18) 
at eval.c:2841
#41 0x00000000005e055d in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=46, nargs=8, args=0x0) at bytecode.c:916
#42 0x00000000005a1324 in Ffuncall (nargs=<optimized out>, args=0x7fffbcddde80) 
at eval.c:2876
#43 0x000000000054e9e7 in Fcompleting_read (prompt=9342561, 
collection=13346450, predicate=13203650, require_match=17289890, 
initial_input=113165873, hist=13204834, def=113165969, 
inherit_input_method=13137010) at minibuf.c:1674
#44 0x00000000005a17bb in Ffuncall (nargs=<optimized out>, args=0x7fffbcdde050) 
at eval.c:2848
#45 0x00000000005e055d in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=140736362045520, nargs=8, args=0x0) at bytecode.c:916
#46 0x00000000005a1324 in Ffuncall (nargs=<optimized out>, args=0x7fffbcdde1f8) 
at eval.c:2876
#47 0x00000000005e055d in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=5, nargs=7, args=0x0) at bytecode.c:916
#48 0x00000000005a1324 in Ffuncall (nargs=<optimized out>, args=0x7fffbcdde368) 
at eval.c:2876
#49 0x00000000005e055d in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=2, nargs=5, args=0x0) at bytecode.c:916
#50 0x00000000005a1324 in Ffuncall (nargs=<optimized out>, args=0x7fffbcdde4b8) 
at eval.c:2876
#51 0x00000000005e055d in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=13137010, nargs=3, args=0x0) at bytecode.c:916
#52 0x00000000005a08a2 in eval_sub (form=<optimized out>) at eval.c:2191
#53 0x00000000005a3311 in Feval (form=9484614, lexical=<optimized out>) at 
eval.c:2003
#54 0x000000000059c70e in Fcall_interactively (function=13516626, 
record_flag=13137010, keys=13172029) at callint.c:345
#55 0x00000000005a16c6 in Ffuncall (nargs=<optimized out>, args=0x7fffbcdde818) 
at eval.c:2822
#56 0x00000000005e055d in exec_byte_code (bytestr=0, vector=0, maxdepth=8230, 
args_template=108, nargs=4, args=0x0) at bytecode.c:916
#57 0x00000000005a1324 in Ffuncall (nargs=<optimized out>, args=0x7fffbcdde970) 
at eval.c:2876
#58 0x00000000005a198a in call1 (fn=<optimized out>, arg1=<optimized out>) at 
eval.c:2614
#59 0x000000000052b3b6 in command_loop_1 () at keyboard.c:1559
#60 0x000000000059f2a2 in internal_condition_case (bfun=0x52ae70 
<command_loop_1>, handlers=<optimized out>, hfun=0x5200f0 <cmd_error>) at 
eval.c:1354
#61 0x000000000051cc2e in command_loop_2 (ignore=<optimized out>) at 
keyboard.c:1177
#62 0x000000000059f1a8 in internal_catch (tag=13137010, func=0x51cc10 
<command_loop_2>, arg=13137010) at eval.c:1118
#63 0x000000000051fc07 in command_loop () at keyboard.c:1156
#64 recursive_edit_1 () at keyboard.c:777
#65 0x000000000051ff55 in Frecursive_edit () at keyboard.c:848
#66 0x0000000000411a95 in main (argc=2, argv=<optimized out>) at emacs.c:1646
You can't do that without a process to debug.
(gdb) fr 6
#6  face_for_char (f=0x66f0858, face=0x0, c=8230, pos=-1, object=13137010) at 
fontset.c:914
914       eassert (fontset_id_valid_p (face->fontset));
(gdb) up
#7  0x0000000000619155 in Finternal_char_font (position=<optimized out>, 
ch=<optimized out>) at fontset.c:1863
1863      face_id = FACE_FOR_CHAR (f, FACE_FROM_ID (f, face_id), c, pos, Qnil);
(gdb)

The incoming face_id value was optimized out, but since "position" is
nil (from looking in the caller's frame), it should've been assigned
from lookup_basic_face(f,DEFAULT_FACE_ID), and since
Vface_remapping_alist is nil, that would just be DEFAULT_FACE_ID or 0.

c=8230 is HORIZONTAL ELLIPSIS

pos=-1

f->face_cache points to:

$22 = {
  buckets = 0x6122800, 
  f = 0x66f0858, 
  faces_by_id = 0x77a97c0, 
  size = 112, 
  used = 0, 
  menu_face_changed_p = false
}

Since "used" is 0, FACE_FROM_ID returns a null pointer, which gets
passed to FACE_FOR_CHAR and face_for_char, and the latter assumes it's
not a null pointer.

The "buckets" array (1001 entries if I read the code right) is all
null pointers. The "faces_by_id" array isn't all null, but the only
non-null entries are at indices above 90 and it looks like anything
above "used" may just be uninitialized.

The funcall_lambda in stack frame 10 appears to be calling
char-displayable-p (from the doc string filename and offset).
The funcall_lambda in stack frame 13 is calling icomplete-completions.
In frame 22 we're calling icomplete-exhibit.
In frame 25 the COMPILED_DOC_STRING slot is 0.

The recent keys typed (extracted from the recent_keys array) end with:

48, 96, 24, 28, 536871384, 536871384, 96, 24, 28, 96, 24, 18259138,
436, 468, 432, 464

536871384 is 0x8000076 or CHAR_META + v
18259138 is the symbol M-backspace

So:
M-v M-v C-x C-f C-g C-x C-f M-backspace m u l t
Then *splat*.

I do not have any recipe for reproducing this.




In GNU Emacs 24.3.92.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2014-06-27 on just-testing.permabit.com
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
System Description:     Ubuntu 12.04.4 LTS

Configured using:
 `configure
 --prefix=/permabit/user/raeburn/I64/install/emacs-24.3.92.precise
 --with-x-toolkit=lucid --enable-checking'

Important settings:
  locale-coding-system: nil

Major mode: CPerl

Minor modes in effect:
  shell-dirtrack-mode: t
  rcirc-track-minor-mode: t
  display-time-mode: t
  which-function-mode: t
  icomplete-mode: t
  hideshowvis-minor-mode: t
  desktop-save-mode: t
  jabber-activity-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t
  hs-minor-mode: t

Recent input:
e s s SPC <M-backspace> s u b p r o c e s s SPC t o 
SPC e x e c SPC C-u C-f C-u C-f C-u C-f C-b C-u C-k 
i n SPC b a c k g r o u n d SPC h a s n ' t SPC d o 
n e SPC t h e SPC e x e c SPC y e t <M-backspace> b 
y SPC t h e SPC t i m e SPC p k i l l SPC r u n s . 
<backspace> , SPC s o SPC t h a t SPC p k i l l SPC 
o e <backspace> <backspace> d o e s n ' t SPC f i n 
d SPC t h e SPC p r o c e s s . SPC I f SPC t h a t 
' s SPC t h e SPC c a s e , SPC s l e e p i n g SPC 
a SPC f e w SPC <M-backspace> 1 <backspace> s e c o 
n d SPC o r SPC t w o SPC w o u l d SPC p r o b a b 
l y SPC f i x SPC i t . <return> I t SPC w o u l d 
SPC b e SPC k i n d SPC o f SPC w e i r d SPC f o r 
SPC t h i n g s SPC t o SPC h a p p e n SPC i n SPC 
t h a t SPC o r d e r SPC t h o u g h . <return> C-M-d 
<escape> x r e p o r t - e m <tab> <return>

Recent messages:
Message from NagiosAdmin in system-alerts@conference.chat.permabit.com
Mark saved where search started
Mark set
Mark saved where search started
limershein@chat.permabit.com is now Online
Checking spelling of RECOGNIZEABLE...
Mark set
tomj@chat.permabit.com is now Offline
simon@chat.permabit.com is now Away (I'm not here right now)
limershein@chat.permabit.com is now Offline

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/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-ratpoison hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-ratpoison
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-si-common hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-si-common
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-wmii hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-wmii
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-disco hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-disco
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-search hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-search
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-keymap hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-keymap
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-gmail hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-gmail
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-socks5 hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-socks5
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-vcard-avatars 
hides /usr/share/emacs/site-lisp/emacs-jabber/jabber-vcard-avatars
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-private hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-private
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-sawfish hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-sawfish
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-ahc hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-ahc
/permabit/user/raeburn/.emacs.d/elpa/jabber-20140523.153/jabber-logon hides 
/usr/share/emacs/site-lisp/emacs-jabber/jabber-logon
~/permabit-emacs/objdump hides /permabit/user/raeburn/elisp/objdump/objdump
~/permabit-emacs/kr-pdoc hides /permabit/user/raeburn/elisp/kr-pdoc
/permabit/user/raeburn/.emacs.d/elpa/systemtap-mode-20121209.1510/systemtap-mode
 hides /permabit/user/raeburn/elisp/systemtap-mode
/permabit/user/raeburn/.emacs.d/elpa/ssh-20120904.1342/ssh hides 
/permabit/user/raeburn/elisp/ssh
/permabit/user/raeburn/.emacs.d/elpa/edit-server-20131229.441/edit-server hides 
/permabit/user/raeburn/elisp/edit-server
~/permabit-emacs/c-fns hides /permabit/user/raeburn/elisp/c-fns
/permabit/user/raeburn/elisp/objdump/loaddefs hides 
/permabit/user/raeburn/I64/install/emacs-24.3.92.precise/share/emacs/24.3.92/lisp/loaddefs

Features:
(shadow sort mail-extr gnus-msg emacsbug sendmail gud descr-text
help-mode misearch multi-isearch face-remap shell pcomplete grep
jabber-rtt goto-addr jabber-keepalive jabber-ping jabber-bookmarks
jabber-private sasl-digest hmac-md5 hex-util mule-util bug-reference
jka-compr flyspell ispell git-commit-mode server log-edit easy-mmode
pcvs-util add-log sh-script smie executable nroff-mode make-mode
systemtap-mode cc-awk python autorevert filenotify vc-dispatcher vc-svn
vc-git rcirc hideshow cc-langs cc-mode cc-fonts cc-guess cc-menus
cc-cmds edit-server-autoloads info git-rebase-mode-autoloads
git-commit-mode-autoloads popup-autoloads ssh-autoloads
systemtap-mode-autoloads package time which-func warnings imenu
icomplete kr-stuff hideshowvis desktop frameset ses byte-opt bytecomp
byte-compile cconv unsafep browse-url edit-server gnus-demon nntp
gnus-art mm-uu mml2015 epg-config mm-view mml-smime smime password-cache
dig gnus-sum nnoo gnus-group gnus-undo nnmail mail-source gnus-start
gnus-spec gnus-int gnus-range message cl-macs rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev gmm-utils mailheader gnus-win gnus gnus-ems
nnheader gnus-util mail-utils mm-util mail-prsvr iso-transl kr-dbus
notifications dbus kr-math jabber jabber-awesome jabber-osd jabber-wmii
jabber-xmessage jabber-festival jabber-sawfish jabber-ratpoison
jabber-screen jabber-socks5 jabber-ft-server jabber-si-server
jabber-ft-client jabber-ft-common jabber-si-client jabber-si-common
jabber-feature-neg jabber-truncate jabber-time jabber-autoaway
jabber-vcard-avatars jabber-chatstates jabber-events jabber-vcard
jabber-avatar mailcap jabber-activity jabber-watch jabber-modeline
jabber-ahc-presence jabber-ahc jabber-version jabber-ourversion
jabber-muc-nick-completion hippie-exp jabber-browse jabber-search
jabber-register jabber-roster format-spec jabber-presence time-date
assoc jabber-muc jabber-newdisco jabber-widget jabber-disco wid-edit
jabber-chat ewoc jabber-history jabber-chatbuffer jabber-alert jabber-iq
jabber-keymap jabber-core jabber-sasl sasl sasl-anonymous sasl-login
sasl-plain fsm jabber-logon jabber-conn srv dns starttls tls jabber-xml
xml jabber-menu jabber-util jabber-autoloads idutils derived thingatpt
compile comint ansi-color ring cperl-mode easymenu cc-styles cc-align
cc-engine cc-vars p4 dired kr-message-timestamp advice c-eldoc cl gv
cl-loaddefs cl-lib cc-defs eldoc help-fns timeclock 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 system-font-setting
font-render-setting x-toolkit x multi-tty emacs)

Memory information:
((conses 16 653516 77413)
 (symbols 48 50191 1)
 (miscs 40 88809 7040)
 (strings 32 99387 12399)
 (string-bytes 1 3055253)
 (vectors 16 40112)
 (vector-slots 8 1303460 94829)
 (floats 8 376 468)
 (intervals 56 41734 2747)
 (buffers 960 208)
 (heap 1024 73655 3286))