[ruby-dev:23074] pthread-enabled ruby receives SEGV when requiring a large library on gdb

永井@知能．九工大です．

表題の通り，pthread-enable な ruby を gdb 上で動かした際に
大きなライブラリを require すると Segmentation fault で
止ってしまいます．
gdb 上でなければ，そのライブラリは正常に読み込まれます．

例えば，次のような具合です．

----------------------------------------------------
% gdb /usr/local/bin/ruby 
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-redhat-linux"...
(gdb) run -e 'require "cgi"'
Starting program: /usr/local/bin/ruby -e 'require "cgi"'
[New Thread 1024 (LWP 25937)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1024 (LWP 25937)]
rb_newobj () at gc.c:379
379         freelist = freelist->as.free.next;
(gdb) bt
#0  rb_newobj () at gc.c:379
#1  0x080913bf in rb_node_newnode (type=NODE_IVAR, a0=10570, a1=0, a2=0)
    at parse.y:4440
#2  0x08052d7f in rb_attr (klass=1075656904, id=10577, read=1, write=0, ex=2)
    at eval.c:628
#3  0x08080732 in rb_mod_attr_reader (argc=1, argv=0xbfffc094, 
    klass=1075656904) at object.c:1679
#4  0x0805bfc1 in rb_call0 (klass=1075731724, recv=1075656904, id=3457, 
    oid=3457, argc=1, argv=0xbfffc094, body=0x401e4e0c, nosuper=0)
    at eval.c:5319
#5  0x0805ca76 in rb_call (klass=1075731724, recv=1075656904, mid=3457, 
    argc=1, argv=0xbfffc094, scope=1) at eval.c:5658
#6  0x08057aaf in rb_eval (self=1075656904, n=0x401c8c34) at eval.c:3256
#7  0x08059596 in module_setup (module=1075656904, n=0x401c7e88) at eval.c:3949
#8  0x080590bd in rb_eval (self=1075659124, n=0x401d37ec) at eval.c:3829
#9  0x08059596 in module_setup (module=1075659124, n=0x401b7c04) at eval.c:3949
#10 0x080590bd in rb_eval (self=1075726864, n=0x401d4bd8) at eval.c:3829
#11 0x080537f8 in eval_node (self=1075726864, node=0x401d4bd8) at eval.c:1276
#12 0x0805e04e in rb_load (fname=1075662824, wrap=0) at eval.c:6407
#13 0x0805e954 in rb_require_safe (fname=1075663044, safe=0) at eval.c:6714
#14 0x0805e503 in rb_f_require (obj=1075726864, fname=1075663044)
    at eval.c:6596
#15 0x0805bf9b in rb_call0 (klass=1075731624, recv=1075726864, id=9505, 
    oid=9505, argc=1, argv=0xbfffeb24, body=0x401d6730, nosuper=0)
    at eval.c:5313
#16 0x0805ca76 in rb_call (klass=1075731624, recv=1075726864, mid=9505, 
    argc=1, argv=0xbfffeb24, scope=1) at eval.c:5658
#17 0x08057aaf in rb_eval (self=1075726864, n=0x401d50d8) at eval.c:3256
#18 0x080537f8 in eval_node (self=1075726864, node=0x401d50d8) at eval.c:1276
#19 0x08053d26 in ruby_exec () at eval.c:1445
#20 0x08053d85 in ruby_run () at eval.c:1466
#21 0x08052122 in Letext () at main.c:50
#22 0x400a613f in __libc_start_main (main=0x8052100 <main>, argc=3, 
    ubp_av=0xbffff7c4, init=0x80514c4 <_init>, fini=0x80c6770 <_fini>, 
    rtld_fini=0x4000c770 <_dl_fini>, stack_end=0xbffff7bc)
    at ../sysdeps/generic/libc-start.c:129
(gdb) 
----------------------------------------------------
% /usr/local/bin/ruby -W -e 'require "cgi"; p 111'
111
----------------------------------------------------

情けなくもお手上げ状態になってしまっているのですが，
原因に何か心当たりはないでしょうか．
-- 
                                         永井 秀利 （九工大 知能情報）
                                             [e-mail]