"Text is read-only" infinite loop (Carbon)

[Magnus Henoch]

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Please write in English if possible, because the Emacs maintainers
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Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Running Carbon Emacs from CVS a couple of days ago, I suddenly noticed
that I couldn't open menus from the menubar - clicking it gave a "Text
is read-only" error.  I tried getting a backtrace by M-x
toggle-debug-on-error, but that didn't change anything.  I switched
between buffers trying to think about something to do.  I use
icomplete-mode, and somehow the "(No matches)" string of icomplete got
into the buffer name I was writing, to which was appended another "(No
matches)" in a loop.  I got out of the minibuffer with C-g, but after
that Emacs got into a loop, giving the "Text is read-only" error and
beeping, and not responding to any keystroke.  I was running Emacs in
gdb, so I switched to the terminal window, hit C-z and got the
backtrace below.

Emacs had been running for about six hours.  I was running Gnus, ERC
and jabber.el at the time.  

This has happened to me before, but I don't know a way to reproduce
this.  What more information can I provide if/when this happens next
time?

(gdb) bt
#0  0xffff8660 in __bzero ()
#1  0x935f2684 in aa_render_shape ()
#2  0x91b859cc in ripr_Coverage ()
#3  0x91b823b4 in ripc_GetClippingState ()
#4  0x91b847a8 in ripc_GetRenderingState ()
#5  0x91b87884 in ripc_DrawRects ()
#6  0x935f023c in __CGContextDrawRects ()
#7  0x93602f40 in CGContextFillRects ()
#8  0x93607830 in CGContextFillRect ()
#9  0x927d99b8 in TilePixMapListCG ()
#10 0x927db78c in DrawPartCG(TTheme*, CGRect const&, CGRect const&, ThemePart*, 
ThemeStateData*, ThemeStateData*, float, CGContext*) ()
#11 0x927db3cc in DrawLayoutCG(TTheme*, LayoutCache*, long, CGRect const&, 
unsigned short, unsigned long, CGRect const&, unsigned long const*, unsigned 
long const*, float, CGContext*) ()
#12 0x927e6dd4 in LayoutEngine::DrawLayoutWithClipComposited(TTheme*, long, 
CGRect const&, unsigned short, long const*, unsigned long, short, unsigned long 
const*, unsigned long const*, float, CGContext*, short) ()
#13 0x927faf88 in LayoutEngine::DrawLayoutWithClip(TTheme*, long, CGRect 
const&, unsigned short, long const*, unsigned long, short, unsigned long 
const*, CGContext*, short) ()
#14 0x927faf3c in LayoutEngine::DrawLayout(TTheme*, long, CGRect const&, 
unsigned short, long const*, unsigned long, unsigned long const*, CGContext*, 
short) ()
#15 0x927eb4b0 in DataEngine::DrawThemeTrack(HIThemeTrackDrawInfo const*, 
CGRect const*, ThemeEraseXUPP*, unsigned long, CGContext*) ()
#16 0x92808a38 in _HIThemeDrawTrack(HIThemeTrackDrawInfo const*, CGRect const*, 
ThemeEraseXUPP*, unsigned long, CGContext*, unsigned long) ()
#17 0x9280f610 in HIScrollBar::DrawSelf(short, OpaqueRgnHandle*, CGContext*) ()
#18 0x927f5abc in HIView::DrawCacheOrSelf(short, OpaqueRgnHandle*, CGContext*) 
()
#19 0x927d5500 in HIView::EventHandler(OpaqueEventHandlerCallRef*, 
OpaqueEventRef*, void*) ()
#20 0x927d1fc8 in DispatchEventToHandlers ()
#21 0x927d223c in SendEventToEventTargetInternal ()
#22 0x927d66bc in SendEventToEventTargetWithOptions ()
#23 0x927ddd5c in SendControlDefDraw(HIView*, short, OpaqueGrafPtr*, 
OpaqueRgnHandle*, CGContext*) ()
#24 0x927dbb74 in HIView::DrawInternal(short, OpaqueGrafPtr*, OpaqueRgnHandle*, 
unsigned char, unsigned char, unsigned char, HIView*, CGContext*) ()
#25 0x927dcc18 in HIView::Draw(short, OpaqueGrafPtr*, OpaqueRgnHandle*, 
unsigned long, HIView*, CGContext*) ()
#26 0x00138860 in XTset_vertical_scroll_bar (w=0x267a1d0, portion=323, 
whole=323, position=0) at /Users/magnus/src/emacs/src/macterm.c:4241
#27 0x0002e608 in redisplay_window (window=40346068, just_this_one_p=0) at 
/Users/magnus/src/emacs/src/xdisp.c:12277
#28 0x0002a15c in redisplay_window_0 (window=-1073760528) at 
/Users/magnus/src/emacs/src/xdisp.c:10646
#29 0x000e7264 in internal_condition_case_1 (bfun=0x2a120 <redisplay_window_0>, 
arg=40346068, handlers=5764349, hfun=0x2a0ec <redisplay_window_error>) at 
/Users/magnus/src/emacs/src/eval.c:1408
#30 0x0002a0c4 in redisplay_windows (window=2804) at 
/Users/magnus/src/emacs/src/xdisp.c:10625
#31 0x000296cc in redisplay_internal (preserve_echo_area=-1073760528) at 
/Users/magnus/src/emacs/src/xdisp.c:10207
#32 0x0008247c in read_char (commandflag=1, nmaps=2, maps=0xbfffed30, 
prev_event=58721281, used_mouse_menu=0xbfffee24) at 
/Users/magnus/src/emacs/src/keyboard.c:2531
#33 0x0008a984 in read_key_sequence (keybuf=0x1, bufsize=40346068, prompt=0, 
dont_downcase_last=2650736, can_return_switch_frame=2650728, 
fix_current_buffer=2650720) at /Users/magnus/src/emacs/src/keyboard.c:8785
#34 0x00080200 in command_loop_1 () at 
/Users/magnus/src/emacs/src/keyboard.c:1528
#35 0x000e70f8 in internal_condition_case (bfun=0x7fd44 <command_loop_1>, 
handlers=58766401, hfun=0x7f6d4 <cmd_error>) at 
/Users/magnus/src/emacs/src/eval.c:1367
#36 0x0007fafc in command_loop_2 () at 
/Users/magnus/src/emacs/src/keyboard.c:1309
#37 0x000e6b6c in internal_catch (tag=-1073760528, func=0x7fabc 
<command_loop_2>, arg=58721281) at /Users/magnus/src/emacs/src/eval.c:1128
#38 0x0007fa54 in command_loop () at /Users/magnus/src/emacs/src/keyboard.c:1288
#39 0x0007f43c in recursive_edit_1 () at 
/Users/magnus/src/emacs/src/keyboard.c:981
#40 0x0007f5d4 in Frecursive_edit () at 
/Users/magnus/src/emacs/src/keyboard.c:1042
#41 0x0007e0d4 in main (argc=2663756, argv=0x287b14) at 
/Users/magnus/src/emacs/src/emacs.c:1736



In GNU Emacs 21.3.50.1 (powerpc-apple-darwin7.6.0)
 of 2004-11-17 on zemdatav.local
Distributor `Apple Computers', version 10.3.6
configured using `configure '--enable-carbon-app' '--without-x''

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: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-undo-mode: t
  erc-autojoin-mode: t
  erc-button-mode: t
  erc-ring-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-fill-mode: t
  erc-netsplit-mode: t
  erc-match-mode: t
  jabber-activity-mode: t
  jabber-mode-line-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t

Recent input:
<return> y M-x r e p o r t SPC e m <return>

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