23.0.60; emacs segfaults when creating X display via emacsclient

23.0.60; emacs segfaults when creating X display via emacsclient

[Lawrence Mitchell]

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

The following sequence of events causes Emacs to segfault
somewhere in x-create-frame.

Run emacs in a terminal

1) emacs -nw -Q --eval '(server-start)'

Create an X frame.
2) emacsclient -c -d :0.0

Delete the frame
3) C-x 5 0

Try and create another X frame.
4) emacsclient -c -d :0.0

leading to the following backtrace:

#0  abort () at /scratch/s0198183/src/emacs/src/emacs.c:432
No locals.
#1  0x08157c0e in internal_condition_case_2 (bfun=0x815a8b8 <Frun_hook_with_args>, nargs=2, args=0xbff11018, handlers=137607417, hfun=0x805c0c8 <delete_frame_handler>) at /scratch/s0198183/src/emacs/src/eval.c:1568
	val = 1
	c = {
  tag = -1074720976, 
  val = 8, 
  next = 0xbff10f30, 
  gcpro = 0x833b8c9, 
  jmp = {{
      __jmpbuf = {140079216, -1074720900, -1074720936, 134598562, -1074720900, 137807897}, 
      __mask_was_saved = 137607369, 
      __saved_mask = {
        __val = {159, 808726579, 858863672, 3220246272, 135656940, 137817233, 147309573, 4232604, 140079216, 140079216, 3220246396, 3220246440, 134599434, 140079216, 3220246396, 137607369, 147892985, 140064784, 3220246544, 1, 147321917, 0, 3220246544, 3220246456, 3552600, 1511, 137608420, 3220246456, 135715964, 137608420, 137607369, 78}
      }
    }}, 
  backlist = 0x16, 
  handlerlist = 0x81ad7ae, 
  lisp_eval_depth = 137608420, 
  pdlcount = -1074720792, 
  poll_suppress_count = 135728988, 
  interrupt_input_blocked = 137608420, 
  byte_stack = 0x81ad7ae
}
	h = {
  handler = 137807897, 
  var = 137607369, 
  chosen_clause = -1074721000, 
  tag = 0x805c9d0, 
  next = 0x8c7f445
}
#2  0x0805db35 in Fdelete_frame (frame=140079220, force=137607417) at /scratch/s0198183/src/emacs/src/frame.c:1412
	args = {137817425, 140079220}
	gcpro1 = {
  next = 0x85eef68, 
  var = 0x8428328, 
  nvars = -1074720680
}
	gcpro2 = {
  next = 0x83739c9, 
  var = 0x833b8f9, 
  nvars = 139882744
}
	f = (struct frame *) 0x8597070
	sf = (struct frame *) 0x835b868
	kb = Variable "kb" is not available.

Further stack frames:

#0  abort () at /scratch/s0198183/src/emacs/src/emacs.c:432
#1  0x08157c0e in internal_condition_case_2 (bfun=0x815a8b8 <Frun_hook_with_args>, nargs=2, args=0xbff11018, handlers=137607417, hfun=0x805c0c8 <delete_frame_handler>) at /scratch/s0198183/src/emacs/src/eval.c:1568
#2  0x0805db35 in Fdelete_frame (frame=140079220, force=137607417) at /scratch/s0198183/src/emacs/src/frame.c:1412
#3  0x080d787a in x_connection_closed (dpy=0x8428328, error_message=0xbff11300 "X protocol error: BadFont (invalid Font parameter) on protocol request 55") at /scratch/s0198183/src/emacs/src/xterm.c:8054
#4  0x080d7bf8 in x_error_quitter (display=0x8428328, error=0xbff115d0) at /scratch/s0198183/src/emacs/src/xterm.c:8187
#5  0x080d7c34 in x_error_handler (display=0x8428328, error=0x0) at /scratch/s0198183/src/emacs/src/xterm.c:8143
#6  0x00363f90 in _XError () from /usr/X11R6/lib/libX11.so.6
#7  0x003646a7 in _XReply () from /usr/X11R6/lib/libX11.so.6
#8  0x0035f266 in XSync () from /usr/X11R6/lib/libX11.so.6
#9  0x080d0cad in x_catch_errors (dpy=0x8428328) at /scratch/s0198183/src/emacs/src/xterm.c:7859
#10 0x080d7601 in x_connection_closed (dpy=0x8428328, error_message=0xbff11990 "X protocol error: BadFont (invalid Font parameter) on protocol request 55") at /scratch/s0198183/src/emacs/src/xterm.c:8017
#11 0x080d7bf8 in x_error_quitter (display=0x8428328, error=0xbff11c60) at /scratch/s0198183/src/emacs/src/xterm.c:8187
#12 0x080d7c34 in x_error_handler (display=0x8428328, error=0x0) at /scratch/s0198183/src/emacs/src/xterm.c:8143
#13 0x00363f90 in _XError () from /usr/X11R6/lib/libX11.so.6
#14 0x003646a7 in _XReply () from /usr/X11R6/lib/libX11.so.6
#15 0x0035f266 in XSync () from /usr/X11R6/lib/libX11.so.6
#16 0x080d0cad in x_catch_errors (dpy=0x8428328) at /scratch/s0198183/src/emacs/src/xterm.c:7859
#17 0x080d7601 in x_connection_closed (dpy=0x8428328, error_message=0xbff12020 "X protocol error: BadFont (invalid Font parameter) on protocol request 55") at /scratch/s0198183/src/emacs/src/xterm.c:8017
#18 0x080d7bf8 in x_error_quitter (display=0x8428328, error=0xbff122f0) at /scratch/s0198183/src/emacs/src/xterm.c:8187
#19 0x080d7c34 in x_error_handler (display=0x8428328, error=0x0) at /scratch/s0198183/src/emacs/src/xterm.c:8143
#20 0x00363f90 in _XError () from /usr/X11R6/lib/libX11.so.6
#21 0x003646a7 in _XReply () from /usr/X11R6/lib/libX11.so.6
#22 0x0034b528 in XAllocColor () from /usr/X11R6/lib/libX11.so.6
#23 0x001111a5 in xpmParseHeader () from /usr/X11R6/lib/libXpm.so.4
#24 0x0011123d in xpmParseHeader () from /usr/X11R6/lib/libXpm.so.4
#25 0x00111b36 in xpmParseHeader () from /usr/X11R6/lib/libXpm.so.4
#26 0x001136f9 in xpmParseDataAndCreate () from /usr/X11R6/lib/libXpm.so.4
#27 0x0011adeb in XpmCreateImageFromData () from /usr/X11R6/lib/libXpm.so.4
#28 0x00119fad in XpmCreatePixmapFromData () from /usr/X11R6/lib/libXpm.so.4
#29 0x080f063c in x_create_bitmap_from_xpm_data (f=0x8597070, bits=0x81c5e20) at /scratch/s0198183/src/emacs/src/image.c:3942
#30 0x080d4f15 in x_bitmap_icon (f=0x8597070, file=137607417) at /scratch/s0198183/src/emacs/src/xterm.c:7744
#31 0x080dad3d in x_set_icon_type (f=0x8597070, arg=137607417, oldval=137607369) at /scratch/s0198183/src/emacs/src/xfns.c:1250
#32 0x0805e45f in x_set_frame_parameters (f=0x8597070, alist=147322741) at /scratch/s0198183/src/emacs/src/frame.c:3052
#33 0x0806024c in x_default_parameter (f=0x8597070, alist=147309765, prop=137816825, deflt=137607417, xprop=0x81b3ece "bitmapIcon", xclass=0x81b3ec3 "BitmapIcon", type=RES_TYPE_SYMBOL) at /scratch/s0198183/src/emacs/src/frame.c:4043
#34 0x080dec07 in Fx_create_frame (parms=147309765) at /scratch/s0198183/src/emacs/src/xfns.c:3560
#35 0x08159773 in Ffuncall (nargs=2, args=0xbff17314) at /scratch/s0198183/src/emacs/src/eval.c:3028
#36 0x08181491 in Fbyte_code (bytestr=136311699, vector=136311716, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:679
#37 0x081591f7 in funcall_lambda (fun=Variable "fun" is not available.
) at /scratch/s0198183/src/emacs/src/eval.c:3212
#38 0x08159622 in Ffuncall (nargs=2, args=0xbff17440) at /scratch/s0198183/src/emacs/src/eval.c:3082
#39 0x08181491 in Fbyte_code (bytestr=136562403, vector=136562420, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:679
#40 0x081591f7 in funcall_lambda (fun=Variable "fun" is not available.
) at /scratch/s0198183/src/emacs/src/eval.c:3212
#41 0x08159622 in Ffuncall (nargs=2, args=0xbff17580) at /scratch/s0198183/src/emacs/src/eval.c:3082
#42 0x08181491 in Fbyte_code (bytestr=136561147, vector=136561164, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:679
#43 0x081591f7 in funcall_lambda (fun=Variable "fun" is not available.
) at /scratch/s0198183/src/emacs/src/eval.c:3212
#44 0x08159622 in Ffuncall (nargs=3, args=0xbff176b0) at /scratch/s0198183/src/emacs/src/eval.c:3082
#45 0x08181491 in Fbyte_code (bytestr=143330219, vector=146520924, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:679
#46 0x081591f7 in funcall_lambda (fun=Variable "fun" is not available.
) at /scratch/s0198183/src/emacs/src/eval.c:3212
#47 0x08159622 in Ffuncall (nargs=4, args=0xbff177f0) at /scratch/s0198183/src/emacs/src/eval.c:3082
#48 0x08181491 in Fbyte_code (bytestr=143340787, vector=146500140, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:679
#49 0x08158d9b in Feval (form=147592405) at /scratch/s0198183/src/emacs/src/eval.c:2356
#50 0x0815ae35 in internal_lisp_condition_case (var=138048433, bodyform=147592405, handlers=147591637) at /scratch/s0198183/src/emacs/src/eval.c:1439
#51 0x08181886 in Fbyte_code (bytestr=143341411, vector=146743916, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:869
#52 0x08158d9b in Feval (form=147594205) at /scratch/s0198183/src/emacs/src/eval.c:2356
#53 0x081577c1 in internal_catch (tag=140559425, func=0x8158924 <Feval>, arg=147594205) at /scratch/s0198183/src/emacs/src/eval.c:1230
#54 0x081818cd in Fbyte_code (bytestr=143341459, vector=145934812, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:854
#55 0x081591f7 in funcall_lambda (fun=Variable "fun" is not available.
) at /scratch/s0198183/src/emacs/src/eval.c:3212
#56 0x08159622 in Ffuncall (nargs=3, args=0xbff17e10) at /scratch/s0198183/src/emacs/src/eval.c:3082
#57 0x0815aa24 in Fapply (nargs=2, args=0xbff17ea0) at /scratch/s0198183/src/emacs/src/eval.c:2513
#58 0x0815ab61 in apply1 (fn=140558777, arg=147242837) at /scratch/s0198183/src/emacs/src/eval.c:2777
#59 0x081860be in read_process_output_call (fun_and_args=147242829) at /scratch/s0198183/src/emacs/src/process.c:4974
#60 0x081578c8 in internal_condition_case_1 (bfun=0x81860a8 <read_process_output_call>, arg=147242829, handlers=137651601, hfun=0x81860c0 <read_process_output_error_handler>) at /scratch/s0198183/src/emacs/src/eval.c:1542
#61 0x081864d7 in read_process_output (proc=139920596, channel=Variable "channel" is not available.
) at /scratch/s0198183/src/emacs/src/process.c:5200
#62 0x08187dcb in wait_reading_process_output (time_limit=30, microsecs=0, read_kbd=-1, do_display=1, wait_for_cell=137607369, wait_proc=0x0, just_wait_proc=0) at /scratch/s0198183/src/emacs/src/process.c:4808
#63 0x08059e35 in sit_for (timeout=240, reading=1, do_display=1) at /scratch/s0198183/src/emacs/src/dispnew.c:6608
#64 0x081001c3 in read_char (commandflag=1, nmaps=2, maps=0xbff196c0, prev_event=137607369, used_mouse_menu=0xbff19708, end_time=0x0) at /scratch/s0198183/src/emacs/src/keyboard.c:2969
#65 0x081025ab in read_key_sequence (keybuf=0xbff19840, bufsize=30, prompt=137607369, dont_downcase_last=0, can_return_switch_frame=1, fix_current_buffer=1) at /scratch/s0198183/src/emacs/src/keyboard.c:9460
#66 0x0810435d in command_loop_1 () at /scratch/s0198183/src/emacs/src/keyboard.c:1655
#67 0x08157ae2 in internal_condition_case (bfun=0x81041b4 <command_loop_1>, handlers=137651601, hfun=0x80fd00c <cmd_error>) at /scratch/s0198183/src/emacs/src/eval.c:1494
#68 0x080f7cc2 in command_loop_2 () at /scratch/s0198183/src/emacs/src/keyboard.c:1370
#69 0x081577c1 in internal_catch (tag=137746577, func=0x80f7ca4 <command_loop_2>, arg=137607369) at /scratch/s0198183/src/emacs/src/eval.c:1230
#70 0x080f7a8a in command_loop () at /scratch/s0198183/src/emacs/src/keyboard.c:1335
#71 0x080f7b70 in recursive_edit_1 () at /scratch/s0198183/src/emacs/src/keyboard.c:958
#72 0x080f7c8f in Frecursive_edit () at /scratch/s0198183/src/emacs/src/keyboard.c:1020
#73 0x0815977e in Ffuncall (nargs=1, args=0xbff19bb0) at /scratch/s0198183/src/emacs/src/eval.c:3022
#74 0x08181491 in Fbyte_code (bytestr=143490955, vector=138050540, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:679
#75 0x08158d9b in Feval (form=138941941) at /scratch/s0198183/src/emacs/src/eval.c:2356
#76 0x0815905b in Fprogn (args=0) at /scratch/s0198183/src/emacs/src/eval.c:451
#77 0x08091604 in Fsave_window_excursion (args=138942085) at /scratch/s0198183/src/emacs/src/window.c:6746
#78 0x0818190e in Fbyte_code (bytestr=143492347, vector=137799884, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:840
#79 0x081591f7 in funcall_lambda (fun=Variable "fun" is not available.
) at /scratch/s0198183/src/emacs/src/eval.c:3212
#80 0x08159622 in Ffuncall (nargs=3, args=0xbff19ee0) at /scratch/s0198183/src/emacs/src/eval.c:3082
#81 0x0815aa24 in Fapply (nargs=2, args=0xbff19f70) at /scratch/s0198183/src/emacs/src/eval.c:2513
#82 0x0815ab61 in apply1 (fn=137746721, arg=138944981) at /scratch/s0198183/src/emacs/src/eval.c:2777
#83 0x08158572 in call_debugger (arg=138944981) at /scratch/s0198183/src/emacs/src/eval.c:308
#84 0x081586c3 in maybe_call_debugger (conditions=137596837, sig=137651769, data=138944957) at /scratch/s0198183/src/emacs/src/eval.c:1984
#85 0x0815885a in find_handler_clause (handlers=137651601, conditions=137596837, sig=137651769, data=138944957) at /scratch/s0198183/src/emacs/src/eval.c:1912
#86 0x081599d1 in Fsignal (error_symbol=137651769, data=138944957) at /scratch/s0198183/src/emacs/src/eval.c:1683
#87 0x08159aed in xsignal (error_symbol=137651769, data=138944957) at /scratch/s0198183/src/emacs/src/eval.c:1733
#88 0x08159dd5 in xsignal1 (error_symbol=137651769, arg=147806537) at /scratch/s0198183/src/emacs/src/eval.c:1750
#89 0x08148e7f in Fsymbol_value (symbol=147806537) at /scratch/s0198183/src/emacs/src/data.c:1121
#90 0x08158bca in Feval (form=147806537) at /scratch/s0198183/src/emacs/src/eval.c:2237
#91 0x08159773 in Ffuncall (nargs=2, args=0xbff1a1d4) at /scratch/s0198183/src/emacs/src/eval.c:3028
#92 0x08181491 in Fbyte_code (bytestr=136690955, vector=136690972, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:679
#93 0x081591f7 in funcall_lambda (fun=Variable "fun" is not available.
) at /scratch/s0198183/src/emacs/src/eval.c:3212
#94 0x08159622 in Ffuncall (nargs=2, args=0xbff1a300) at /scratch/s0198183/src/emacs/src/eval.c:3082
#95 0x08181491 in Fbyte_code (bytestr=136691203, vector=136691220, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:679
#96 0x081591f7 in funcall_lambda (fun=Variable "fun" is not available.
) at /scratch/s0198183/src/emacs/src/eval.c:3212
#97 0x08159622 in Ffuncall (nargs=2, args=0xbff1a430) at /scratch/s0198183/src/emacs/src/eval.c:3082
#98 0x08181491 in Fbyte_code (bytestr=136689403, vector=136689420, maxdepth=Variable "maxdepth" is not available.
) at /scratch/s0198183/src/emacs/src/bytecode.c:679
#99 0x081591f7 in funcall_lambda (fun=Variable "fun" is not available.
) at /scratch/s0198183/src/emacs/src/eval.c:3212
#100 0x08159622 in Ffuncall (nargs=1, args=0xbff1a580) at /scratch/s0198183/src/emacs/src/eval.c:3082
#101 0x0815ab72 in apply1 (fn=143338897, arg=137607369) at /scratch/s0198183/src/emacs/src/eval.c:2766
#102 0x08155fcd in Fcall_interactively (function=143338897, record_flag=137607369, keys=137645788) at /scratch/s0198183/src/emacs/src/callint.c:386
#103 0x0815974f in Ffuncall (nargs=4, args=0xbff1a760) at /scratch/s0198183/src/emacs/src/eval.c:3028
#104 0x0815987c in call3 (fn=137770177, arg1=143338897, arg2=137607369, arg3=137607369) at /scratch/s0198183/src/emacs/src/eval.c:2855
#105 0x080fc766 in Fcommand_execute (cmd=143338897, record_flag=137607369, keys=137607369, special=137607369) at /scratch/s0198183/src/emacs/src/keyboard.c:10444
#106 0x0810451a in command_loop_1 () at /scratch/s0198183/src/emacs/src/keyboard.c:1910
#107 0x08157ae2 in internal_condition_case (bfun=0x81041b4 <command_loop_1>, handlers=137651601, hfun=0x80fd00c <cmd_error>) at /scratch/s0198183/src/emacs/src/eval.c:1494
#108 0x080f7cc2 in command_loop_2 () at /scratch/s0198183/src/emacs/src/keyboard.c:1370
#109 0x081577c1 in internal_catch (tag=137646449, func=0x80f7ca4 <command_loop_2>, arg=137607369) at /scratch/s0198183/src/emacs/src/eval.c:1230
#110 0x080f7ad4 in command_loop () at /scratch/s0198183/src/emacs/src/keyboard.c:1349
#111 0x080f7b70 in recursive_edit_1 () at /scratch/s0198183/src/emacs/src/keyboard.c:958
#112 0x080f7c8f in Frecursive_edit () at /scratch/s0198183/src/emacs/src/keyboard.c:1020
#113 0x080f6e49 in main (argc=5, argv=0xbff1ade4) at /scratch/s0198183/src/emacs/src/emacs.c:1793


Lisp Backtrace:
"x-create-frame" (0xbff17318)
"x-create-frame-with-faces" (0xbff17444)
"make-frame" (0xbff17584)
"make-frame-on-display" (0xbff176b4)
"server-create-window-system-frame" (0xbff177f4)
"byte-code" (0xbff178e0)
"byte-code" (0xbff17b50)
"server-process-filter" (0xbff17e14)
"recursive-edit" (0xbff19bb4)
"byte-code" (0xbff19c60)
"debug" (0xbff19ee4)
"eval" (0xbff1a1d8)
"eval-last-sexp-1" (0xbff1a304)
"eval-last-sexp" (0xbff1a434)
"eval-print-last-sexp" (0xbff1a584)
"call-interactively" (0xbff1a764)


-- 
Lawrence Mitchell <wence@gmx.li>

Re: 23.0.60; emacs segfaults when creating X display via emacsclient

[Lawrence Mitchell]

Lawrence Mitchell wrote:
> Please describe exactly what actions triggered the bug
> and the precise symptoms of the bug:

> The following sequence of events causes Emacs to segfault
> somewhere in x-create-frame.

> Run emacs in a terminal

> 1) emacs -nw -Q --eval '(server-start)'

> Create an X frame.
> 2) emacsclient -c -d :0.0

> Delete the frame
> 3) C-x 5 0

> Try and create another X frame.
> 4) emacsclient -c -d :0.0

[...]

I managed to cut my configuration info from that bug email it is:

In GNU Emacs 23.0.60.2 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2008-02-04 on lamacq.ph.ed.ac.uk
configured using `configure  '--prefix=/scratch/s0198183/applications/emacs-trunk/' '--enable-font-backend' '--with-xft' '--with-libotf' '\
--with-m17n-flt' '-C''

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: en_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

-- 
Lawrence Mitchell <wence@gmx.li>

--enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Dan Nicolaescu]

Lawrence Mitchell <wence@gmx.li> writes:

  > Please describe exactly what actions triggered the bug
  > and the precise symptoms of the bug:
  > 
  > The following sequence of events causes Emacs to segfault
  > somewhere in x-create-frame.
  > 
  > Run emacs in a terminal
  > 
  > 1) emacs -nw -Q --eval '(server-start)'
  > 
  > Create an X frame.
  > 2) emacsclient -c -d :0.0
  > 
  > Delete the frame
  > 3) C-x 5 0
  > 
  > Try and create another X frame.
  > 4) emacsclient -c -d :0.0
  > 
  > leading to the following backtrace:

I don't get a segfault, but emacs and emacsclient hang.

It only happens when configuring with --enable-font-backend, it works
fine without that flag.

Re: --enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Kenichi Handa]

In article <200802050018.m150IrgE007563@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:

> Run emacs in a terminal
> 
> 1) emacs -nw -Q --eval '(server-start)'
> 
> Create an X frame.
> 2) emacsclient -c -d :0.0
> 
> Delete the frame
> 3) C-x 5 0
> 
> Try and create another X frame.
> 4) emacsclient -c -d :0.0
> 
> leading to the following backtrace:

> I don't get a segfault, but emacs and emacsclient hang.

As I got "Fatal error (6)Aborted", I started the debugging
by running the first emacs under gdb.  But I found that I
can't suspend it by typing C-z once I did the step 2).
Emacs just shows this message: "Suspending an Emacs running
under X makes no sense".

This makes the debugging very difficult.  :-(
Is this a multi-tty problem?

---
Kenichi Handa
handa@ni.aist.go.jp

PS.  I had to do this to get this "abort".

1) emacs -nw -Q --eval '(server-start)'
2) emacsclient -c -d :0.0
3) type C-h h
4) C-x 5 0
5) emacsclient -c -d :0.0
6) type C-h h

Re: --enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Dan Nicolaescu]

Kenichi Handa <handa@ni.aist.go.jp> writes:

  > In article <200802050018.m150IrgE007563@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:
  > 
  > > Run emacs in a terminal
  > > 
  > > 1) emacs -nw -Q --eval '(server-start)'
  > > 
  > > Create an X frame.
  > > 2) emacsclient -c -d :0.0
  > > 
  > > Delete the frame
  > > 3) C-x 5 0
  > > 
  > > Try and create another X frame.
  > > 4) emacsclient -c -d :0.0
  > > 
  > > leading to the following backtrace:
  > 
  > > I don't get a segfault, but emacs and emacsclient hang.
  > 
  > As I got "Fatal error (6)Aborted", I started the debugging
  > by running the first emacs under gdb.  But I found that I
  > can't suspend it by typing C-z once I did the step 2).
  > Emacs just shows this message: "Suspending an Emacs running
  > under X makes no sense".
  > 
  > This makes the debugging very difficult.  :-(

Why not start the debugger in another terminal and attach to the emacs
process?

  > Is this a multi-tty problem?

The "Suspending an Emacs running under X" message? It is, I posted a
message about that on emacs-devel a week or two ago. But that is
harmless, it should not affect anything here. Emacs just refuses to
suspend an tty frame thinking that it has an X11 frame.

Again, if emacs is not configured with --enable-font-backend everything
works fine.  So it seems that the new font backend is the culprit here.

  > ---
  > Kenichi Handa
  > handa@ni.aist.go.jp
  > 
  > PS.  I had to do this to get this "abort".
  > 
  > 1) emacs -nw -Q --eval '(server-start)'
  > 2) emacsclient -c -d :0.0
  > 3) type C-h h
  > 4) C-x 5 0
  > 5) emacsclient -c -d :0.0

After this step emacs and emacsclien hang completely for me, so I can't
do step 6.

  > 6) type C-h h

Re: --enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Kenichi Handa]

In article <200802050815.m158FAHS021150@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:

> Why not start the debugger in another terminal and attach to the emacs
> process?

I tried it, but, when I type C-z on gdb terminal, gdb itself
is suspended.

> Is this a multi-tty problem?

> The "Suspending an Emacs running under X" message? It is, I posted a
> message about that on emacs-devel a week or two ago.

Ah, sorry, I overlooked it.  I've just found your mail in
the archive, and found this solution from it, thank you:
  (setq suspend-emacs nil)

> Again, if emacs is not configured with --enable-font-backend everything
> works fine.  So it seems that the new font backend is the culprit here.

Yes, I'm not doubting it.

---
Kenichi Handa
handa@ni.aist.go.jp

Re: --enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Dan Nicolaescu]

Kenichi Handa <handa@ni.aist.go.jp> writes:

  > In article <200802050815.m158FAHS021150@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:
  > 
  > > Why not start the debugger in another terminal and attach to the emacs
  > > process?
  > 
  > I tried it, but, when I type C-z on gdb terminal, gdb itself
  > is suspended.

Use C-c to get the gdb prompt, not C-z.

Re: --enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Kenichi Handa]

In article <200802051357.m15DvHou009298@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:

> Kenichi Handa <handa@ni.aist.go.jp> writes:
> In article <200802050815.m158FAHS021150@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:
> 
> > Why not start the debugger in another terminal and attach to the emacs
> > process?
> 
> I tried it, but, when I type C-z on gdb terminal, gdb itself
> is suspended.

> Use C-c to get the gdb prompt, not C-z.

When I type C-c in the gdb terminal, nothing happens except
for beep sound.

---
Kenichi Handa
handa@ni.aist.go.jp

Re: --enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Nick Roberts]

 > > > Why not start the debugger in another terminal and attach to the emacs
 > > > process?
 > > 
 > > I tried it, but, when I type C-z on gdb terminal, gdb itself
 > > is suspended.
 > 
 > > Use C-c to get the gdb prompt, not C-z.
 > 
 > When I type C-c in the gdb terminal, nothing happens except
 > for beep sound.

Yes, I'm not sure if the signal handling in .gdbinit is appropriate for this
situation and signal handling appears to have changed in X.  What happens if
you comment out the line

handle 2 noprint pass

in .gdbinit before starting gdb?  Does typing C-c DTRT now?

-- 
Nick                                           http://www.inet.net.nz/~nickrob

Re: --enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Dan Nicolaescu]

Kenichi Handa <handa@ni.aist.go.jp> writes:

  > In article <200802051357.m15DvHou009298@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:
  > 
  > > Kenichi Handa <handa@ni.aist.go.jp> writes:
  > > In article <200802050815.m158FAHS021150@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:
  > > 
  > > > Why not start the debugger in another terminal and attach to the emacs
  > > > process?
  > > 
  > > I tried it, but, when I type C-z on gdb terminal, gdb itself
  > > is suspended.
  > 
  > > Use C-c to get the gdb prompt, not C-z.
  > 
  > When I type C-c in the gdb terminal, nothing happens except
  > for beep sound.

Does this backtrace (from an up to date build) help?


(gdb) bt
#0  0x005ed0a0 in _xcb_unlock_io () from /usr/lib/libxcb.so.1
#1  0x005c9649 in xcb_xlib_lock () from /usr/lib/libxcb-xlib.so.0
#2  0x00644a56 in ?? () from /usr/lib/libX11.so.6
#3  0x0064518c in _XReply () from /usr/lib/libX11.so.6
#4  0x00638eaa in XSync () from /usr/lib/libX11.so.6
#5  0x080d7a7d in x_catch_errors (dpy=0x8686890)
    at /tmp/emacs/src/xterm.c:7859
#6  0x080db19d in x_connection_closed (dpy=0x8686890, 
    error_message=0xbfebc758 "X protocol error: BadFont (invalid Font parameter) on protocol request 55") at /tmp/emacs/src/xterm.c:8017
#7  0x080db84a in x_error_quitter (display=0x8686890, error=0xbfebca18)
    at /tmp/emacs/src/xterm.c:8187
#8  0x080db89d in x_error_handler (display=0x8686890, error=0x0)
    at /tmp/emacs/src/xterm.c:8143
#9  0x0063d71e in _XError () from /usr/lib/libX11.so.6
#10 0x00644aaa in ?? () from /usr/lib/libX11.so.6
#11 0x0064518c in _XReply () from /usr/lib/libX11.so.6
#12 0x006329f8 in XQueryColors () from /usr/lib/libX11.so.6
#13 0x081c525f in xftfont_get_colors (f=0x8cb7050, face=0x86d76e8, gc=<value optimized out>, 
    xftface_info=0x0, fg=0x8c156c0, bg=0x8c156cc)
    at /tmp/emacs/src/xftfont.c:120
#14 0x081c57ee in xftfont_prepare_face (f=0x8cb7050, face=0x86d76e8)
    at /tmp/emacs/src/xftfont.c:425
#15 0x080cabda in prepare_face_for_display (f=0x8cb7050, face=0x86d76e8)
    at /tmp/emacs/src/xfaces.c:5631
#16 0x080677d6 in get_glyph_face_and_encoding (f=0x8cb7050, glyph=<value optimized out>, 
    char2b=0xbfebcd80, two_byte_p=0xbfebcd58)
    at /tmp/emacs/src/xdisp.c:19276
#17 0x08067a89 in fill_glyph_string (s=0xbfebce30, face_id=12, start=<value optimized out>, end=83, 
    overlaps=0) at /tmp/emacs/src/xdisp.c:19426
#18 0x08068b44 in draw_glyphs (w=0x870ac50, x=<value optimized out>, row=0x8601078, area=TEXT_AREA, 
    start=0, end=83, hl=DRAW_NORMAL_TEXT, overlaps=0)
    at /tmp/emacs/src/xdisp.c:20026
#19 0x0806a7e1 in x_write_glyphs (start=0x8718440, len=83)
    at /tmp/emacs/src/xdisp.c:21478
#20 0x08052d9e in update_window_line (w=0x870ac50, vpos=64, mouse_face_overwritten_p=0xbfebd2e8)
    at /tmp/emacs/src/dispnew.c:4446
#21 0x080552b4 in update_window (w=0x870ac50, force_p=0)
    at /tmp/emacs/src/dispnew.c:4245
#22 0x0805635c in update_window_tree (w=0x870ac50, force_p=0)
    at /tmp/emacs/src/dispnew.c:3995
#23 0x08058521 in update_frame (f=0x8cb7050, force_p=0, inhibit_hairy_id_p=0)
    at /tmp/emacs/src/dispnew.c:3923
#24 0x08087d3e in redisplay_internal (preserve_echo_area=<value optimized out>)
    at /tmp/emacs/src/xdisp.c:11621
#25 0x08119a28 in read_char (commandflag=1, nmaps=2, maps=0xbfebde40, prev_event=137743681, 
    used_mouse_menu=0xbfebdee8, end_time=0x0)
    at /tmp/emacs/src/keyboard.c:2724
#26 0x0811b8aa in read_key_sequence (keybuf=0xbfebdf84, bufsize=30, prompt=137743681, 
    dont_downcase_last=0, can_return_switch_frame=1, fix_current_buffer=1)
    at /tmp/emacs/src/keyboard.c:9460
#27 0x0811d743 in command_loop_1 () at /tmp/emacs/src/keyboard.c:1655
#28 0x081758a2 in internal_condition_case (bfun=0x811d5a0 <command_loop_1>, handlers=137787897, 
    hfun=0x8118650 <cmd_error>) at /tmp/emacs/src/eval.c:1494
#29 0x08117ac3 in command_loop_2 () at /tmp/emacs/src/keyboard.c:1370
#30 0x0817595a in internal_catch (tag=137782745, func=0x8117aa0 <command_loop_2>, arg=137743681)
    at /tmp/emacs/src/eval.c:1230
#31 0x081184b7 in command_loop () at /tmp/emacs/src/keyboard.c:1349
#32 0x0811881a in recursive_edit_1 () at /tmp/emacs/src/keyboard.c:958
#33 0x08118951 in Frecursive_edit () at /tmp/emacs/src/keyboard.c:1020
#34 0x0810d3a7 in main (argc=3, argv=0xbfebe684)
    at /tmp/emacs/src/emacs.c:1793

Re: --enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Kenichi Handa]

In article <200802061528.m16FSb4C026474@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:

> Does this backtrace (from an up to date build) help?

> (gdb) bt
> #0  0x005ed0a0 in _xcb_unlock_io () from /usr/lib/libxcb.so.1
> #1  0x005c9649 in xcb_xlib_lock () from /usr/lib/libxcb-xlib.so.0
> #2  0x00644a56 in ?? () from /usr/lib/libX11.so.6
> #3  0x0064518c in _XReply () from /usr/lib/libX11.so.6
> #4  0x00638eaa in XSync () from /usr/lib/libX11.so.6
> #5  0x080d7a7d in x_catch_errors (dpy=0x8686890)
>     at /tmp/emacs/src/xterm.c:7859
> #6  0x080db19d in x_connection_closed (dpy=0x8686890, 
>     error_message=0xbfebc758 "X protocol error: BadFont (invalid Font parameter) on protocol request 55") at /tmp/emacs/src/xterm.c:8017
[...]

Yes, thank you.  I found what is wrong, but the fix needs
more time.  Please wait.

---
Kenichi Handa
handa@ni.aist.go.jp

Re: --enable-font-backend bug

[Leo]

On 2008-02-13 12:42 +0000, Kenichi Handa wrote:
>> #0  0x005ed0a0 in _xcb_unlock_io () from /usr/lib/libxcb.so.1
>> #1  0x005c9649 in xcb_xlib_lock () from /usr/lib/libxcb-xlib.so.0
>> #2  0x00644a56 in ?? () from /usr/lib/libX11.so.6
>> #3  0x0064518c in _XReply () from /usr/lib/libX11.so.6
>> #4  0x00638eaa in XSync () from /usr/lib/libX11.so.6
>> #5  0x080d7a7d in x_catch_errors (dpy=0x8686890)
>>     at /tmp/emacs/src/xterm.c:7859
>> #6  0x080db19d in x_connection_closed (dpy=0x8686890, 
>>     error_message=0xbfebc758 "X protocol error: BadFont (invalid Font parameter) on protocol request 55") at /tmp/emacs/src/xterm.c:8017
> [...]
>
> Yes, thank you.  I found what is wrong, but the fix needs more time.
> Please wait.

Looking forward to this fix ;)

-- 
.:  Leo  :.  [ sdl.web AT gmail.com ]  .:  [ GPG Key: 9283AA3F ]  :.

          Use the best OS -- http://www.fedoraproject.org/

Re: --enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Kenichi Handa]

In article <E1JPGwe-0007Bj-Oc@etlken.m17n.org>, Kenichi Handa <handa@ni.aist.go.jp> writes:

> In article <200802061528.m16FSb4C026474@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:
> > Does this backtrace (from an up to date build) help?

> > (gdb) bt
> > #0  0x005ed0a0 in _xcb_unlock_io () from /usr/lib/libxcb.so.1
> > #1  0x005c9649 in xcb_xlib_lock () from /usr/lib/libxcb-xlib.so.0
> > #2  0x00644a56 in ?? () from /usr/lib/libX11.so.6
> > #3  0x0064518c in _XReply () from /usr/lib/libX11.so.6
> > #4  0x00638eaa in XSync () from /usr/lib/libX11.so.6
> > #5  0x080d7a7d in x_catch_errors (dpy=0x8686890)
> >     at /tmp/emacs/src/xterm.c:7859
> > #6  0x080db19d in x_connection_closed (dpy=0x8686890, 
> >     error_message=0xbfebc758 "X protocol error: BadFont (invalid Font parameter) on protocol request 55") at /tmp/emacs/src/xterm.c:8017
> [...]

> Yes, thank you.  I found what is wrong, but the fix needs
> more time.  Please wait.

I installed some fixes.  With the new code, the emacs
configured with '--with-x-toolkit=lucid
--enable-font-backend' works.

But, if I configured emacs to use Gtk, emacsclient causes
segfault as this:

(gdb) bt
#0  0xb78cf727 in XFreeGC () from /usr/X11R6/lib/libX11.so.6
#1  0xb7c728be in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#2  0x00000000 in ?? ()

Lisp Backtrace:
"delete-frame" (0xbfdb6ae4)
"call-interactively" (0xbfdb6d44)

and it's reproducable with the emacs before unicode merge.
On this system, the version of Gtk+ is 2.6.4.

---
Kenichi Handa
handa@ni.aist.go.jp

Re: --enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Dan Nicolaescu]

Kenichi Handa <handa@m17n.org> writes:

  > In article <E1JPGwe-0007Bj-Oc@etlken.m17n.org>, Kenichi Handa <handa@ni.aist.go.jp> writes:
  > 
  > > In article <200802061528.m16FSb4C026474@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:
  > > > Does this backtrace (from an up to date build) help?
  > 
  > > > (gdb) bt
  > > > #0  0x005ed0a0 in _xcb_unlock_io () from /usr/lib/libxcb.so.1
  > > > #1  0x005c9649 in xcb_xlib_lock () from /usr/lib/libxcb-xlib.so.0
  > > > #2  0x00644a56 in ?? () from /usr/lib/libX11.so.6
  > > > #3  0x0064518c in _XReply () from /usr/lib/libX11.so.6
  > > > #4  0x00638eaa in XSync () from /usr/lib/libX11.so.6
  > > > #5  0x080d7a7d in x_catch_errors (dpy=0x8686890)
  > > >     at /tmp/emacs/src/xterm.c:7859
  > > > #6  0x080db19d in x_connection_closed (dpy=0x8686890, 
  > > >     error_message=0xbfebc758 "X protocol error: BadFont (invalid Font parameter) on protocol request 55") at /tmp/emacs/src/xterm.c:8017
  > > [...]
  > 
  > > Yes, thank you.  I found what is wrong, but the fix needs
  > > more time.  Please wait.
  > 
  > I installed some fixes.  With the new code, the emacs
  > configured with '--with-x-toolkit=lucid
  > --enable-font-backend' works.
  > 
  > But, if I configured emacs to use Gtk, emacsclient causes
  > segfault as this:
  > 
  > (gdb) bt
  > #0  0xb78cf727 in XFreeGC () from /usr/X11R6/lib/libX11.so.6
  > #1  0xb7c728be in ?? () from /usr/lib/libgdk-x11-2.0.so.0
  > #2  0x00000000 in ?? ()
  > 
  > Lisp Backtrace:
  > "delete-frame" (0xbfdb6ae4)
  > "call-interactively" (0xbfdb6d44)
  > 
  > and it's reproducable with the emacs before unicode merge.
  > On this system, the version of Gtk+ is 2.6.4.

Everything works fine for me when using gtk 2.12.
Thanks!

Re: --enable-font-backend bug (was: Re: 23.0.60; emacs segfaults when creating X display via emacsclient)

[Kenichi Handa]

In article <200802171548.m1HFmQEo003995@sallyv1.ics.uci.edu>, Dan Nicolaescu <dann@ics.uci.edu> writes:

> Kenichi Handa <handa@m17n.org> writes:
[...]
> I installed some fixes.  With the new code, the emacs
> configured with '--with-x-toolkit=lucid
> --enable-font-backend' works.
> 
> But, if I configured emacs to use Gtk, emacsclient causes
> segfault as this:
> 
> (gdb) bt
> #0  0xb78cf727 in XFreeGC () from /usr/X11R6/lib/libX11.so.6
> #1  0xb7c728be in ?? () from /usr/lib/libgdk-x11-2.0.so.0
> #2  0x00000000 in ?? ()
> 
> Lisp Backtrace:
> "delete-frame" (0xbfdb6ae4)
> "call-interactively" (0xbfdb6d44)
> 
> and it's reproducable with the emacs before unicode merge.
> On this system, the version of Gtk+ is 2.6.4.

> Everything works fine for me when using gtk 2.12.

Thank you for testing it.  I updated my gtk to 2.12 too, and
confirmed that the above segfault doesn't happen anymore.

I hope this problem is settled now.

---
Kenichi Handa
handa@ni.aist.go.jp