Re: Redisplay crash

[Piet van Oostrum]

>>>>> Kenichi Handa <address@hidden> (KH) wrote:

KH> Thank you for the info.  I found at least one way to crash
KH> Emacs constantly.

KH> At first, evaluate this in *scratch* buffer.

KH> (put-text-property 2 3 'display '(when (clear-face-cache t)))

KH> Then, type C-h h C-x C-k (i.e. view HELLO file and kill that
KH> buffer).

For me, on Mac OS X, the first step alone will already crash emacs.
This is the backtrace:

Program received signal EXC_BAD_ACCESS, Could not access memory.
0x00021054 in get_next_display_element (it=0xbfffd430) at xdisp.c:4948
4948              it->face_id = FACE_FOR_CHAR (it->f, face, it->c);
(gdb) bt
#0  0x00021054 in get_next_display_element (it=0xbfffd430) at xdisp.c:4948
#1  0x00021970 in next_element_from_buffer (it=0xbfffd430) at xdisp.c:5436
#2  0x00020cc0 in get_next_display_element (it=0xbfffd430) at xdisp.c:4787
#3  0x00031520 in display_line (it=0xbfffd430) at xdisp.c:14411
#4  0x0002d6c4 in try_window (window=10719952, pos={charpos = 1, bytepos = 1}) 
at xdisp.c:12140
#5  0x0002c820 in redisplay_window (window=-2110188656, just_this_one_p=0) at 
xdisp.c:11783
#6  0x00029978 in redisplay_window_0 (window=10719952) at xdisp.c:10538
#7  0x000e0cc0 in internal_condition_case_1 (bfun=0x2993c <redisplay_window_0>, 
arg=-2110188656, handlers=-1604078312, hfun=0x29908 <redisplay_window_error>) 
at eval.c:1374
#8  0x000298e0 in redisplay_windows (window=0) at xdisp.c:10517
#9  0x000298c0 in redisplay_windows (window=0) at xdisp.c:10511
#10 0x00028f20 in redisplay_internal (preserve_echo_area=10719952) at 
xdisp.c:10102
#11 0x0007e24c in read_char (commandflag=1, nmaps=3, maps=0xbfffecc0, 
prev_event=595592192, used_mouse_menu=0xbfffedc4) at keyboard.c:2472
#12 0x0008686c in read_key_sequence (keybuf=0x34b6f4, bufsize=3505968, 
prompt=-2110188656, dont_downcase_last=-1821406164, can_return_switch_frame=1, 
fix_current_buffer=1) at keyboard.c:8770
#13 0x0007c01c in command_loop_1 () at keyboard.c:1476
#14 0x000e0b54 in internal_condition_case (bfun=0x7bb60 <command_loop_1>, 
handlers=595637240, hfun=0x7b560 <cmd_error>) at eval.c:1333
#15 0x0007b988 in command_loop_2 () at keyboard.c:1264
#16 0x000e05bc in internal_catch (tag=10719952, func=0x7b948 <command_loop_2>, 
arg=595592192) at eval.c:1094
#17 0x0007b8e0 in command_loop () at keyboard.c:1243
#18 0x0007b2fc in recursive_edit_1 () at keyboard.c:959
#19 0x0007b484 in Frecursive_edit () at keyboard.c:1015
#20 0x00079fac in main (argc=3510216, argv=0x3565ac) at emacs.c:1692
(gdb) quit

-- 
Piet van Oostrum <address@hidden>
URL: http://www.cs.uu.nl/~piet [PGP]
Private email: address@hidden