# \[bug:trunk\] undef load and backtrace

**URL:** <https://www.ruby-forum.com/t/bug-trunk-undef-load-and-backtrace/189904>\
**Category:** Development\
**Created:** [June 9, 2010, 5:18pm UTC](https://www.ruby-forum.com/t/bug-trunk-undef-load-and-backtrace/189904 "2010-06-09T17:18:47Z")\
**Posts on this page:** 2\
**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:** [June 9, 2010, 5:18pm UTC](https://www.ruby-forum.com/t/bug-trunk-undef-load-and-backtrace/189904/1 "2010-06-09T17:18:47Z")

</div>

e$B0J2\<$N$h$&$K$9$k$He(B SEGV e$B$7$^$9!#e(B

% cat t.rb  
class C  
def initialize  
@a = @b = @c = @d = nil  
end  
end  
GC.stress = true  
module Kernel  
undef load  
end  
C.new  
raise  
% ./ruby -ve ‘load “t.rb”’  
ruby 1.9.3dev (2010-06-08 trunk 28202) [i686-linux]  
t.rb:11: [BUG] Segmentation fault  
ruby 1.9.3dev (2010-06-08 trunk 28202) [i686-linux]

– control frame ----------  
c:0006 p:0063 s:0014 b:0014 l:000013 d:000013 TOP t.rb:11  
c:0005 p:---- s:0012 b:0012 l:000011 d:000011 FINISH  
zsh: segmentation fault (core dumped) ./ruby -ve ‘load “t.rb”’  
% RUBY\_DEBUG=core ./ruby -ve ‘load “t.rb”’  
ruby 1.9.3dev (2010-06-08 trunk 28202) [i686-linux]  
zsh: segmentation fault (core dumped) RUBY\_DEBUG=core ./ruby -ve ‘load  
“t.rb”’  
% gdb ruby core.5445  
GNU gdb 6.8-debian  
Copyright (C) 2008 Free Software Foundation, Inc.  
License GPLv3+: GNU GPL version 3 or later  
[http://gnu.org/licenses/gpl.html](http://gnu.org/licenses/gpl.html)  
This is free software: you are free to change and redistribute it.  
There is NO WARRANTY, to the extent permitted by law. Type “show  
copying”  
and “show warranty” for details.  
This GDB was configured as “i486-linux-gnu”…

warning: Can’t read pathname for load map: Input/output error.  
Reading symbols from /lib/i686/cmov/libpthread.so.0…Reading symbols  
from /usr/lib/debug/lib/i686/cmov/libpthread-2.7.so…done.  
done.  
Loaded symbols for /lib/i686/cmov/libpthread.so.0  
Reading symbols from /lib/i686/cmov/librt.so.1…Reading symbols from  
/usr/lib/debug/lib/i686/cmov/librt-2.7.so…done.  
done.  
Loaded symbols for /lib/i686/cmov/librt.so.1  
Reading symbols from /lib/i686/cmov/libdl.so.2…Reading symbols from  
/usr/lib/debug/lib/i686/cmov/libdl-2.7.so…done.  
done.  
Loaded symbols for /lib/i686/cmov/libdl.so.2  
Reading symbols from /lib/i686/cmov/libcrypt.so.1…Reading symbols  
from /usr/lib/debug/lib/i686/cmov/libcrypt-2.7.so…done.  
done.  
Loaded symbols for /lib/i686/cmov/libcrypt.so.1  
Reading symbols from /lib/i686/cmov/libm.so.6…Reading symbols from  
/usr/lib/debug/lib/i686/cmov/libm-2.7.so…done.  
done.  
Loaded symbols for /lib/i686/cmov/libm.so.6  
Reading symbols from /lib/i686/cmov/libc.so.6…Reading symbols from  
/usr/lib/debug/lib/i686/cmov/libc-2.7.so…done.  
done.  
Loaded symbols for /lib/i686/cmov/libc.so.6  
Reading symbols from /lib/ld-linux.so.2…Reading symbols from  
/usr/lib/debug/lib/ld-2.7.so…done.  
done.  
Loaded symbols for /lib/ld-linux.so.2  
Reading symbols from  
/home/ruby/tcio/lib/ruby/1.9.1/i686-linux/enc/encdb.so…done.  
Loaded symbols for  
/home/ruby/tcio/lib/ruby/1.9.1/i686-linux/enc/encdb.so  
Reading symbols from  
/home/ruby/tcio/lib/ruby/1.9.1/i686-linux/enc/euc\_jp.so…done.  
Loaded symbols for  
/home/ruby/tcio/lib/ruby/1.9.1/i686-linux/enc/euc\_jp.so  
Reading symbols from  
/home/ruby/tcio/lib/ruby/1.9.1/i686-linux/enc/trans/transdb.so…done.  
Loaded symbols for  
/home/ruby/tcio/lib/ruby/1.9.1/i686-linux/enc/trans/transdb.so  
Core was generated by `./ruby -ve load “t.rb”'.  
Program terminated with signal 11, Segmentation fault.  
[New process 5445]  
[New process 5446]  
#0 0x08154da2 in vm\_backtrace\_each (th=0x87cb030, lev=-2,  
init=0x8154dfe \<vm\_backtrace\_alloc\>,  
iter=0x8154e18 \<vm\_backtrace\_push\>, arg=0xbff27034) at vm.c:741  
741 id = cfp-\>me-\>def-\>original\_id;  
(gdb) bt  
#0 0x08154da2 in vm\_backtrace\_each (th=0x87cb030, lev=-2,  
init=0x8154dfe \<vm\_backtrace\_alloc\>,  
iter=0x8154e18 \<vm\_backtrace\_push\>, arg=0xbff27034) at vm.c:741  
#1 0x08154f86 in vm\_backtrace (th=0x87cb030, lev=-1) at vm.c:784  
#2 0x08153492 in rb\_make\_backtrace () at vm\_eval.c:1610  
#3 0x0805f194 in setup\_exception (th=0x87cb030, tag=6,  
mesg=142541120) at eval.c:389  
#4 0x0805f81c in rb\_raise\_jump (mesg=4) at eval.c:589  
#5 0x0805f606 in rb\_f\_raise (argc=0, argv=0xb7a46044) at eval.c:519  
#6 0x0814d8a1 in call\_cfunc (func=0x805f5c3 \<rb\_f\_raise\>,  
recv=142587860, len=-1, argc=0, argv=0xb7a46044)  
at vm\_insnhelper.c:314  
#7 0x0814d779 in vm\_call\_cfunc (th=0x87cb030, reg\_cfp=0xb7ac5f00,  
num=0, recv=142587860, blockptr=0x0, me=0x880f730)  
at vm\_insnhelper.c:401  
#8 0x0814cd4d in vm\_call\_method (th=0x87cb030, cfp=0xb7ac5f00, num=0,  
blockptr=0x0, flag=24, id=2752, me=0x880f730,  
recv=142587860) at vm\_insnhelper.c:523  
#9 0x0814893a in vm\_exec\_core (th=0x87cb030, initial=0) at  
insns.def:1006  
#10 0x08155b59 in vm\_exec (th=0x87cb030) at vm.c:1145  
#11 0x081562f9 in rb\_iseq\_eval (iseqval=142496180) at vm.c:1372  
#12 0x081914b1 in rb\_load\_internal (fname=142497460, wrap=0) at  
load.c:302  
#13 0x081916b6 in rb\_f\_load (argc=1, argv=0xb7a46024) at load.c:375  
#14 0x0814d8a1 in call\_cfunc (func=0x81915ff \<rb\_f\_load\>,  
recv=142587860, len=-1, argc=1, argv=0xb7a46024)  
at vm\_insnhelper.c:314  
#15 0x0814d779 in vm\_call\_cfunc (th=0x87cb030, reg\_cfp=0xb7ac5f84,  
num=1, recv=142587860, blockptr=0x0, me=0x88476c8)  
at vm\_insnhelper.c:401  
#16 0x0814cd4d in vm\_call\_method (th=0x87cb030, cfp=0xb7ac5f84, num=1,  
blockptr=0x0, flag=8, id=5944, me=0x88476c8,  
recv=142587860) at vm\_insnhelper.c:523  
#17 0x0814893a in vm\_exec\_core (th=0x87cb030, initial=0) at  
insns.def:1006  
#18 0x08155b59 in vm\_exec (th=0x87cb030) at vm.c:1145  
#19 0x08156332 in rb\_iseq\_eval\_main (iseqval=142497640) at vm.c:1386  
#20 0x0805edb8 in ruby\_exec\_internal (n=0x87e5768) at eval.c:214  
#21 0x0805eec1 in ruby\_exec\_node (n=0x87e5768) at eval.c:261  
#22 0x0805ee95 in ruby\_run\_node (n=0x87e5768) at eval.c:254  
#23 0x0805d908 in main (argc=3, argv=0xbff287f4) at main.c:35  
(gdb)

e$B$J$\*!"$3$l$Oe(B RUBY\_DEBUG=gc\_stress e$B$Ge(B  
rubyspec/core/kernel/autoload\_spec.rb  
e$B$H$$$&$N$+$i8+$D$1$?$b$N$G$9!#e(B

---

<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:** [September 9, 2010, 2:37am UTC](https://www.ruby-forum.com/t/bug-trunk-undef-load-and-backtrace/189904/2 "2010-09-09T02:37:28Z")

</div>

e$B%A%1%C%He(B #3417 e$B$,99?7$5$l$^$7$?!#e(B (by Yui NARUSE)

e$B%9%F!\<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B  
ruby -v ruby 1.9.3dev (2010-06-08 trunk 28202)  
[i686-linux]e$B$K%;%C%He(B

## trunk r29199 e$B$G$OD\>$C$F$$$k$h$&$G$9e(B

[http://redmine.ruby-lang.org/issues/show/3417](http://redmine.ruby-lang.org/issues/show/3417)