infinite loop with show-paren-mode turned on

[Satyaki Das]

Emacs from CVS, updated about half an hour back, goes into an
infinite loop if show-paren-mode is turned on. To reproduce this
perform the following steps:

  (1) Start emacs with:
        emacs -q --no-site-file

  (2) In the running emacs do:

        M-: (show-paren-mode 1) RET
        M-x replace-string RET {} RET 0 RET
        M-x replace-string RET M-p M-p C-e

      At this point Emacs enters into an infinite loop.

I ran it in gdb and the backtrace is attached at the end of the
email. For me this is completely reproducable and happens both in
X and in the terminal.

Satyaki


$ gdb ./emacs
GNU gdb Red Hat Linux (5.3post-0.20021129.18rh)
Copyright 2003 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...
DISPLAY = :0.0
TERM = xterm
Breakpoint 1 at 0x8103fda: file emacs.c, line 417.
Breakpoint 2 at 0x80e679c: file xterm.c, line 7829.
(gdb) run -q --no-site-file
Starting program: /usr/local/garnome/emacs/src/emacs -q --no-site-file
 
Program received signal SIGTSTP, Stopped (user).
overlays_at (pos=18, extend=0, vec_ptr=0xbfffbdb4, len_ptr=0xbfffbdb8, 
next_ptr=0xbfffbdbc, prev_ptr=0x0, change_req=0) at buffer.c:2509
2509          startpos = OVERLAY_POSITION (start);
(gdb) bt
#0  overlays_at (pos=18, extend=0, vec_ptr=0xbfffbdb4, len_ptr=0xbfffbdb8, 
next_ptr=0xbfffbdbc, prev_ptr=0x0, change_req=0) at buffer.c:2509
#1  0x080de052 in face_at_buffer_position (w=0x856cef0, pos=18, region_beg=-1, 
region_end=-1, endptr=0xbfffbe58, limit=-1073758796, mouse=0) at xfaces.c:7232
#2  0x0809211a in handle_face_prop (it=0xbfffc1c0) at xdisp.c:2780
#3  0x08091c3a in handle_stop (it=0xbfffc1c0) at xdisp.c:2506
#4  0x0809584d in next_element_from_buffer (it=0xbfffc1c0) at xdisp.c:5318
#5  0x08094d30 in get_next_display_element (it=0xbfffc1c0) at xdisp.c:4670
#6  0x08095aab in move_it_in_display_line_to (it=0xbfffc1c0, to_charpos=19, 
to_x=-1, op=8) at xdisp.c:5485
#7  0x08095d88 in move_it_to (it=0xbfffc1c0, to_charpos=19, to_x=-1, to_y=-1, 
to_vpos=-1, op=8) at xdisp.c:5674
#8  0x08097f58 in resize_mini_window (w=0x856cef0, exact_p=0) at xdisp.c:7184
#9  0x0809bc6b in redisplay_internal (preserve_echo_area=1) at xdisp.c:9737
#10 0x08111d3e in detect_input_pending_run_timers (do_display=1) at 
keyboard.c:9913
#11 0x0818e05d in wait_reading_process_input (time_limit=30, microsecs=0, 
read_kbd=268435455, do_display=1) at process.c:4116
#12 0x080877d1 in sit_for (sec=30, usec=0, reading=1, display=1, 
initial_display=0) at dispnew.c:6247
#13 0x081096e2 in read_char (commandflag=1, nmaps=2, maps=0xbfffcc60, 
prev_event=405653084, used_mouse_menu=0xbfffcc98) at keyboard.c:2720
#14 0x0810fea1 in read_key_sequence (keybuf=0xbfffcdc0, bufsize=30, 
prompt=405653084, dont_downcase_last=0, can_return_switch_frame=1, 
fix_current_buffer=1)
    at keyboard.c:8825
#15 0x08106a47 in command_loop_1 () at keyboard.c:1504
#16 0x0815e5ea in internal_condition_case (bfun=0x81068c8 <command_loop_1>, 
handlers=405764172, hfun=0x81064b8 <cmd_error>) at eval.c:1333
#17 0x081067a2 in command_loop_2 () at keyboard.c:1292
#18 0x0815e189 in internal_catch (tag=138678008, func=0x8106784 
<command_loop_2>, arg=405653084) at eval.c:1094
#19 0x0810670e in command_loop () at keyboard.c:1263
#20 0x08106294 in recursive_edit_1 () at keyboard.c:987
#21 0x08128580 in read_minibuf (map=1479440664, initial=405653084, 
prompt=1214949576, backup_n=0, expflag=0, histvar=407891996, histpos=0, 
defalt=405653084,
    allow_props=0, inherit_input_method=1) at minibuf.c:657
#22 0x08128dbe in Fread_from_minibuffer (prompt=945215604, 
initial_contents=405653084, keymap=1479440664, read=405653084, hist=407891996, 
default_value=405653084,
    inherit_input_method=405653132) at minibuf.c:942
#23 0x08160142 in Ffuncall (nargs=8, args=0xbfffd244) at eval.c:2740
#24 0x08187c24 in Fbyte_code (bytestr=407892044, vector=7, 
maxdepth=-1073753536) at bytecode.c:710
#25 0x081603ef in funcall_lambda (fun=1210590100, nargs=2, 
arg_vector=0xbfffd310) at eval.c:2911
#26 0x081602be in apply_lambda (fun=1210590100, args=405653084, eval_flag=1) at 
eval.c:2833
#27 0x0815f5ac in Feval (form=1210590100) at eval.c:2136
#28 0x0815deb1 in Flet (args=1479029468) at eval.c:920
#29 0x0815f89c in Feval (form=1210700392) at eval.c:2025
#30 0x0815ca48 in Fcall_interactively (function=407892428, 
record_flag=405653132, keys=1211033704) at callint.c:377
#31 0x08111702 in Fcommand_execute (cmd=407892428, record_flag=405653132, 
keys=405653084, special=405653084) at keyboard.c:9724
#32 0x08111a08 in Fexecute_extended_command (prefixarg=405653084) at 
keyboard.c:9835
#33 0x081600fe in Ffuncall (nargs=2, args=0xbfffd854) at eval.c:2724
#34 0x0815c084 in Fcall_interactively (function=405760580, 
record_flag=405653084, keys=1211033704) at callint.c:850
#35 0x08111702 in Fcommand_execute (cmd=405760580, record_flag=405653084, 
keys=405653084, special=405653084) at keyboard.c:9724
#36 0x08106c17 in command_loop_1 () at keyboard.c:1755
#37 0x0815e5ea in internal_condition_case (bfun=0x81068c8 <command_loop_1>, 
handlers=405764172, hfun=0x81064b8 <cmd_error>) at eval.c:1333
#38 0x081067a2 in command_loop_2 () at keyboard.c:1292
#39 0x0815e189 in internal_catch (tag=138678008, func=0x8106784 
<command_loop_2>, arg=405653084) at eval.c:1094
#40 0x08106758 in command_loop () at keyboard.c:1271
#41 0x08106294 in recursive_edit_1 () at keyboard.c:987
#42 0x081063a4 in Frecursive_edit () at keyboard.c:1043
#43 0x08104cdb in main (argc=3, argv=0xbfffdfe4) at emacs.c:1666
#44 0x420156a4 in __libc_start_main () from /lib/tls/libc.so.6
(gdb)