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Emacs crashes when using Ediff


From: Frederik Fouvry
Subject: Emacs crashes when using Ediff
Date: Wed, 20 Oct 2004 16:39:42 +0200 (CEST)

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English, because the Emacs maintainers do not have
translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list,
and to the gnu.emacs.bug news group.

In GNU Emacs 21.3.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2004-02-19 on cc.at.coli.uni-sb.de
configured using `configure  --prefix=/export/black --with-xpm --with-jpeg 
--with-tiff --with-gif --with-png --with-x --with-gcc --with-pop --with-sound'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: POSIX
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: address@hidden
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_GB
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

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

I have been merging two directories with Tools > Merge > Directories ...
It happens quite frequently (roughly two to three times an hour)
that Emacs crashes during this operation.  I cannot tell
if it only happens on a specific action or not.

I have attached gdb to it, and this is the output:

[Initialisation and loading messages were removed.]

Program received signal SIGSEGV, Segmentation fault.
0x08113d24 in mem_delete_fixup (x=0x8264780) at alloc.c:3076
3076    alloc.c: No such file or directory.
        in alloc.c
(gdb) bt
#0  0x08113d24 in mem_delete_fixup (x=0x8264780) at alloc.c:3076
#1  0x08113cc8 in mem_delete (z=0x8f19090) at alloc.c:3012
#2  0x08111fde in lisp_free (block=0x918d888) at alloc.c:632
#3  0x0811572b in gc_sweep () at alloc.c:5270
#4  0x081144a4 in Fgarbage_collect () at alloc.c:4194
#5  0x08126f48 in Ffuncall (nargs=2, args=0xbfffd750) at eval.c:2599
#6  0x0814e2c4 in Fbyte_code (bytestr=147373852, vector=1, 
    maxdepth=-1073752240) at bytecode.c:716
#7  0x08127164 in funcall_lambda (fun=1224132872, nargs=3, 
    arg_vector=0xbfffd864) at eval.c:2851
#8  0x08126d82 in Ffuncall (nargs=4, args=0xbfffd860) at eval.c:2716
#9  0x0814e2c4 in Fbyte_code (bytestr=136929868, vector=3, 
    maxdepth=-1073751968) at bytecode.c:716
#10 0x08127164 in funcall_lambda (fun=1224859392, nargs=3, 
    arg_vector=0xbfffd984) at eval.c:2851
#11 0x08126d82 in Ffuncall (nargs=4, args=0xbfffd980) at eval.c:2716
#12 0x0814e2c4 in Fbyte_code (bytestr=151138556, vector=3, 
    maxdepth=-1073751680) at bytecode.c:716
#13 0x08127164 in funcall_lambda (fun=1224763112, nargs=4, 
    arg_vector=0xbfffdab4) at eval.c:2851
#14 0x08126d82 in Ffuncall (nargs=5, args=0xbfffdab0) at eval.c:2716
#15 0x0814e2c4 in Fbyte_code (bytestr=151137716, vector=4, 
    maxdepth=-1073751376) at bytecode.c:716
---Type <return> to continue, or q <return> to quit--- 
#16 0x08127164 in funcall_lambda (fun=1224335896, nargs=2, 
    arg_vector=0xbfffdbe4) at eval.c:2851
#17 0x08126d82 in Ffuncall (nargs=3, args=0xbfffdbe0) at eval.c:2716
#18 0x0814e2c4 in Fbyte_code (bytestr=147376460, vector=2, 
    maxdepth=-1073751072) at bytecode.c:716
#19 0x08127164 in funcall_lambda (fun=1224336120, nargs=1, 
    arg_vector=0xbfffdd04) at eval.c:2851
#20 0x08126d82 in Ffuncall (nargs=2, args=0xbfffdd00) at eval.c:2716
#21 0x0814e2c4 in Fbyte_code (bytestr=147430620, vector=1, 
    maxdepth=-1073750784) at bytecode.c:716
#22 0x08127164 in funcall_lambda (fun=1225088952, nargs=1, 
    arg_vector=0xbfffde24) at eval.c:2851
#23 0x08126d82 in Ffuncall (nargs=2, args=0xbfffde20) at eval.c:2716
#24 0x0814e2c4 in Fbyte_code (bytestr=146498508, vector=1, 
    maxdepth=-1073750496) at bytecode.c:716
#25 0x08127164 in funcall_lambda (fun=1224501712, nargs=0, 
    arg_vector=0xbfffdf44) at eval.c:2851
#26 0x08126d82 in Ffuncall (nargs=1, args=0xbfffdf40) at eval.c:2716
#27 0x0814e2c4 in Fbyte_code (bytestr=147299372, vector=0, 
    maxdepth=-1073750208) at bytecode.c:716
#28 0x08127164 in funcall_lambda (fun=1225024632, nargs=2, 
    arg_vector=0xbfffe064) at eval.c:2851
#29 0x08126d82 in Ffuncall (nargs=3, args=0xbfffe060) at eval.c:2716
---Type <return> to continue, or q <return> to quit---
#30 0x0814e2c4 in Fbyte_code (bytestr=146595700, vector=2, 
    maxdepth=-1073749920) at bytecode.c:716
#31 0x08127164 in funcall_lambda (fun=1225606472, nargs=1, 
    arg_vector=0xbfffe1a4) at eval.c:2851
#32 0x08126d82 in Ffuncall (nargs=2, args=0xbfffe1a0) at eval.c:2716
#33 0x08122e7b in Fcall_interactively (function=419288668, 
    record_flag=405215452, keys=1210580568) at callint.c:797
#34 0x080dbe3e in Fcommand_execute (cmd=-1728194980, record_flag=405215452, 
    keys=405215452, special=405215452) at keyboard.c:9250
#35 0x080d222e in command_loop_1 () at keyboard.c:1661
#36 0x081252fe in internal_condition_case (bfun=0x80d1eb0 <command_loop_1>, 
    handlers=405311796, hfun=0x80d1ad8 <cmd_error>) at eval.c:1267
#37 0x080d1d8a in command_loop_2 () at keyboard.c:1245
#38 0x08124eb9 in internal_catch (tag=151791368, 
    func=0x80d1d6c <command_loop_2>, arg=405215452) at eval.c:1030
#39 0x080d1d40 in command_loop () at keyboard.c:1224
#40 0x080d18a8 in recursive_edit_1 () at keyboard.c:950
#41 0x080d19c4 in Frecursive_edit () at keyboard.c:1006
#42 0x080d0457 in main (argc=1, argv=0xbfffe944, envp=0xbfffe94c)
    at emacs.c:1547
#43 0x42015967 in __libc_start_main () from /lib/i686/libc.so.6
(gdb) 


Another problem with Edit/merge is that Emacs gives an error
"trying to set a constant symbol" on moving to the next area (or
a message to that effect).  When going back and immediately
return to the same position (i.e. typing `p' `n') the message is
not repeated.

Recent input:
<down> <down> <down> <down> <down> <down> <right> <right> 
<right> <right> <right> <right> <return> <down> <down> 
<down> <down> <down> <down> <down> <up> <up> <up> <up> 
<down> <down> l <down> <left> <left> <return> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> n <down> <next> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <f8> 
C-g <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <menu-bar> 
<help-menu> <report-emacs-bug>

Recent messages:
Mark set
Loading emacsbug...done
byte-code: Quit
Composing main Info directory...
Mark set
Composing main Info directory...done
unzipping emacs.gz...done
unzipping emacs-1.gz...done
Mark saved where search started
unzipping emacs-27.gz...done
keyboard-quit: Quit




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