# \[Bug:1.8\] SEGV by ObjectSpace.define\_finalizer("") {}

**URL:** <https://www.ruby-forum.com/t/bug-1-8-segv-by-objectspace-define-finalizer/162884>\
**Category:** Development\
**Created:** [March 15, 2009, 3:10am UTC](https://www.ruby-forum.com/t/bug-1-8-segv-by-objectspace-define-finalizer/162884 "2009-03-15T03:10:32Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Tanaka\_A](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/c67d28/32.png) [@Tanaka\_A](https://www.ruby-forum.com/u/Tanaka_A)\
**Post date:** [March 15, 2009, 3:10am UTC](https://www.ruby-forum.com/t/bug-1-8-segv-by-objectspace-define-finalizer/162884/1 "2009-03-15T03:10:32Z")

</div>

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% ./ruby -ve ‘ObjectSpace.define\_finalizer("") {}’  
ruby 1.8.8dev (2009-03-15 revision 22961) [i686-linux]  
zsh: segmentation fault ./ruby -ve ‘ObjectSpace.define\_finalizer("")  
{}’

% gdb ruby  
GNU gdb 6.4.90-debian  
Copyright © 2006 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 “i486-linux-gnu”…Using host libthread\_db  
library “/lib/tls/i686/cmov/libthread\_db.so.1”.

(gdb) run -ve ‘ObjectSpace.define\_finalizer("") {}’  
Starting program: /home/akr/ruby/18/ruby/ruby -ve  
‘ObjectSpace.define\_finalizer("") {}’  
Failed to read a valid object file image from memory.  
[Thread debugging using libthread\_db enabled]  
[New Thread -1210190144 (LWP 30411)]  
ruby 1.8.8dev (2009-03-15 revision 22961) [i686-linux]

Program received signal SIGSEGV, Segmentation fault.  
[Switching to Thread -1210190144 (LWP 30411)]  
0x081428c2 in ?? ()  
(gdb) bt  
#0 0x081428c2 in ?? ()  
#1 0xbfcdb98c in ?? ()  
#2 0x080716f6 in run\_final (obj=3084700200) at gc.c:1964  
#3 0x08071ab7 in rb\_gc\_call\_finalizer\_at\_exit () at gc.c:2020  
#4 0x0805a5b4 in ruby\_finalize\_1 () at eval.c:1601  
#5 0x0806b782 in ruby\_cleanup (ex=0) at eval.c:1641  
#6 0x0806b8c1 in ruby\_stop (ex=0) at eval.c:1699  
#7 0x0806ba31 in ruby\_run () at eval.c:1720  
#8 0x080536bf in main (argc=Cannot access memory at address 0x2  
) at main.c:48  
(gdb)