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SIGSEGV in garbage collection

From: Reiner Steib
Subject: SIGSEGV in garbage collection
Date: Wed, 19 Feb 2003 17:09:10 +0100
User-agent: Gnus/5.090016 (Oort Gnus v0.16) Emacs/21.2.95

This bug report will be sent to the Free Software Foundation,
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Please write in English, because the Emacs maintainers do not have
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In GNU Emacs (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2003-02-17 on ni
configured using `configure  --prefix=/import/xtra/emacs/RC'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: POSIX
  value of $LC_CTYPE: en_US.ISO_8859-1
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  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:

While using Gnus (Oort Gnus v0.16) with the pretest-Emacs (,
CVS update approximately on Mon Feb 17 11:42:56 CET 2003) I
experienced crashes from time to time.  Therefore I ran it under gdb
for a while and got the following back trace:

| theotp5:~$ gdb /import/xtra/emacs/RC/bin/emacs
| GNU gdb 5.0
| Copyright 2000 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-suse-linux"...
| (gdb) run /home/dept/ste/etc/emacsen/gnus/personal.el \
|  /home/dept/ste/etc/emacsen/gnus/split-methods.el \
|  /home/dept/ste/work/misc/home/gnus -f gnus
| Starting program: /import/xtra/emacs/RC/bin/emacs \
|  /home/dept/ste/etc/emacsen/gnus/personal.el \
|  /home/dept/ste/etc/emacsen/gnus/split-methods.el \
|  /home/dept/ste/work/misc/home/gnus -f gnus
| Program received signal SIGSEGV, Segmentation fault.
| 0x8116dae in mem_delete_fixup (x=0x826bc80) at alloc.c:3043
| 3043              if (w->left->color == MEM_BLACK && w->right->color == 
| (gdb) bt
| #0  0x8116dae in mem_delete_fixup (x=0x826bc80) at alloc.c:3043
| #1  0x8116d40 in mem_delete (z=0x9247ad8) at alloc.c:3012
| #2  0x8114e8b in lisp_free (block=0x9247ab0) at alloc.c:632
| #3  0x81191b4 in gc_sweep () at alloc.c:5270
| #4  0x8117e87 in Fgarbage_collect () at alloc.c:4194
| #5  0x80d64b9 in read_char (commandflag=1, nmaps=3, maps=0xbfffdec4, 
|     prev_event=405245404, used_mouse_menu=0xbfffdf0c) at keyboard.c:2514
| #6  0x80dcc22 in read_key_sequence (keybuf=0xbfffe014, bufsize=30, 
|     prompt=405245404, dont_downcase_last=0, can_return_switch_frame=1, 
|     fix_current_buffer=1) at keyboard.c:8191
| #7  0x80d4aa4 in command_loop_1 () at keyboard.c:1440
| #8  0x8128927 in internal_condition_case (bfun=0x80d47b0 <command_loop_1>, 
|     handlers=405341748, hfun=0x80d43c0 <cmd_error>) at eval.c:1267
| #9  0x80d466e in command_loop_2 () at keyboard.c:1245
| #10 0x812849f in internal_catch (tag=405303332, 
|     func=0x80d4650 <command_loop_2>, arg=405245404) at eval.c:1030
| #11 0x80d4613 in command_loop () at keyboard.c:1224
| #12 0x80d412d in recursive_edit_1 () at keyboard.c:950
| #13 0x80d4271 in Frecursive_edit () at keyboard.c:1006
| #14 0x80d3071 in main (argc=6, argv=0xbfffe5d4, envp=0xbfffe5f0)
|     at emacs.c:1547
| #15 0x4032ebaf in __libc_start_main () from /lib/libc.so.6

I have the following setting:

 gc-cons-threshold 10000000; garbage collection
 garbage-collection-messages t)

Therefore, I saw that Emacs was doing garbage collection during the
crash, at least that is the last message, that I have seen.

I still have the crashed session in gdb, so if I can provide other
(more useful) information from the gdb session, you should tell me

Recent input:
[deleted, doesn't correspond to the bug]

Recent messages:
[deleted, doesn't correspond to the bug]

Bye, Reiner.
      (o o)
---ooO-(_)-Ooo--- PGP key available via WWW   http://rsteib.home.pages.de/

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