# Dumps core when 'def a; a.foo; end; a'

**URL:** <https://www.ruby-forum.com/t/dumps-core-when-def-a-a-foo-end-a/69392>\
**Category:** Development\
**Created:** [September 20, 2006, 7:03pm UTC](https://www.ruby-forum.com/t/dumps-core-when-def-a-a-foo-end-a/69392 "2006-09-20T19:03:15Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![sugie](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/82dd89/32.png) [@sugie](https://www.ruby-forum.com/u/sugie)\
**Post date:** [September 20, 2006, 7:03pm UTC](https://www.ruby-forum.com/t/dumps-core-when-def-a-a-foo-end-a/69392/1 "2006-09-20T19:03:15Z")

</div>

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$ ruby-trunk -ve ‘def a; a.foo; end; a’  
ruby 1.9.0 (2006-09-20) [i686-linux]  
e$B%;%0%a%s%F!\<%7%g%s0cH?$G$9e(B (core dumped)  
$

"foo"e$B$r4{B8$N%a%=%C%I$KJQ$($F$bF1MM$G$9!#e(B

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$ gdb ruby-trunk core  
GNU gdb 6.3-debian  
Copyright 2004 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-linux”…Using host libthread\_db  
library “/lib/tls/libthread\_db.so.1”.

Core was generated by `ruby-trunk -ve def a; a.object\_id; end; a’.  
Program terminated with signal 11, Segmentation fault.

warning: current\_sos: Can’t read pathname for load map:  
e$BF~NOe(B/e$B=PNO%(%i!\<$G$9e(B

Reading symbols from /lib/tls/libdl.so.2…done.  
Loaded symbols for /lib/tls/libdl.so.2  
Reading symbols from /lib/tls/libcrypt.so.1…done.  
Loaded symbols for /lib/tls/libcrypt.so.1  
Reading symbols from /lib/tls/libm.so.6…done.  
Loaded symbols for /lib/tls/libm.so.6  
Reading symbols from /lib/tls/libc.so.6…done.  
Loaded symbols for /lib/tls/libc.so.6  
Reading symbols from /lib/ld-linux.so.2…done.  
Loaded symbols for /lib/ld-linux.so.2  
#0 rb\_eval (self=1075675500, n=0x22) at …/eval.c:3280  
3280 CALLARGS;  
(gdb) bt  
#0 rb\_eval (self=1075675500, n=0x22) at …/eval.c:3280  
#1 0x080600a9 in rb\_call0 (klass=1075686580, recv=1075675500, id=10801,  
oid=10801, argc=0, argv=0x0, block=0x0, body=0x401af0f0, flags=18)  
at …/eval.c:5841  
#2 0x080609cd in rb\_call (klass=1075686580, recv=1075675500, mid=10801,  
argc=0, argv=0x0, block=0x0, scope=CALLING\_VCALL, iter=0) at  
…/eval.c:5975  
#3 0x0805a939 in rb\_eval (self=1075675500, n=0x22) at ruby.h:752  
#4 0x0805a7a7 in rb\_eval (self=1075675500, n=0x22) at …/eval.c:3283  
#5 0x080600a9 in rb\_call0 (klass=1075686580, recv=1075675500, id=10801,  
oid=10801, argc=0, argv=0x0, block=0x0, body=0x401af0f0, flags=18)  
at …/eval.c:5841  
#6 0x080609cd in rb\_call (klass=1075686580, recv=1075675500, mid=10801,  
argc=0, argv=0x0, block=0x0, scope=CALLING\_VCALL, iter=0) at  
…/eval.c:5975  
#7 0x0805a939 in rb\_eval (self=1075675500, n=0x22) at ruby.h:752  
#8 0x0805a7a7 in rb\_eval (self=1075675500, n=0x22) at …/eval.c:3283  
#9 0x080600a9 in rb\_call0 (klass=1075686580, recv=1075675500, id=10801,  
oid=10801, argc=0, argv=0x0, block=0x0, body=0x401af0f0, flags=18)  
at …/eval.c:5841  
#10 0x080609cd in rb\_call (klass=1075686580, recv=1075675500, mid=10801,  
argc=0, argv=0x0, block=0x0, scope=CALLING\_VCALL, iter=0) at  
…/eval.c:5975  
#11 0x0805a939 in rb\_eval (self=1075675500, n=0x22) at ruby.h:752  
#12 0x0805a7a7 in rb\_eval (self=1075675500, n=0x22) at …/eval.c:3283  
#13 0x080600a9 in rb\_call0 (klass=1075686580, recv=1075675500, id=10801,

(e$B0J2\<e(Brb\_evale$B$He(Brb\_calle$B!"e(Brb\_call0e$B$N$\_$,2?I42s$bB3$/e(B)

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---

<div class="post-metadata">

**Author:** ![sugie](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/82dd89/32.png) [@sugie](https://www.ruby-forum.com/u/sugie)\
**Post date:** [September 21, 2006, 12:48am UTC](https://www.ruby-forum.com/t/dumps-core-when-def-a-a-foo-end-a/69392/2 "2006-09-21T00:48:13Z")

</div>

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In message “Re: [ruby-dev:29594] dumps core when ‘def a; a.foo; end; a’”  
on Thu, 21 Sep 2006 02:01:20 +0900, Tadashi S.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

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|  
|$ ruby-trunk -ve ‘def a; a.foo; end; a’  
|ruby 1.9.0 (2006-09-20) [i686-linux]  
|e$B%;%0%a%s%F!\<%7%g%s0cH?$G$9e(B (core dumped)  
|$  
|  
|"foo"e$B$r4{B8$N%a%=%C%I$KJQ$($F$bF1MM$G$9!#e(B

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```
                            e$B$^$D$b$He(B e$B$f$-$R$me(B /:|)

```

---

<div class="post-metadata">

**Author:** ![sugie](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/82dd89/32.png) [@sugie](https://www.ruby-forum.com/u/sugie)\
**Post date:** [September 21, 2006, 7:34pm UTC](https://www.ruby-forum.com/t/dumps-core-when-def-a-a-foo-end-a/69392/3 "2006-09-21T19:34:50Z")

</div>

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On Thu, 21 Sep 2006 07:47:58 +0900  
Yukihiro M. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> e$B\<B$O!“%9%?%C%/%l%Y%k$N%A%'%C%/$OKh2s$d$k$H=E2a$.$k$N$G$+$J$je(B  
> e$B4V0z$$$F$$$k$N$G$9$,!”$3$N%A%'%C%/$N4V$K%9%?%C%/$r\>CHq$7$9$.e(B  
> e$B$k$He(Bsegmentation faulte$B$K$J$j$^$9!#$3$l$Oe(BYARVe$B$K$G$b$J$i$J$$8Be(B  
> e$B$jD\>$;$J$$e(B(e$B4{CN$Ne(B)e$B%P%0$G$9!#e(B

e$B$J$k$[$I!"$3$A$i$ON;2r$7$^$7$?!#e(B

> e$B$3$l$OFf$G$9$,e(B(e$BK\Ev$Ke(Bn=0x22e$B$J$i:F5"$9$kA0$KMn$A$F$k$O$:e(B)e$B!"$\*e(B  
> e$B$=$i$/:GE,2=$N1F6A$G$O$J$$$G$7$g$&$+!#e(B

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$ ruby-trunk -ve ‘def a; a.foo; end; a’  
ruby 1.9.0 (2006-09-22) [i686-linux]  
-e:1:in `a': stack level too deep (SystemStackError) from -e:1:in `a’  
from -e:1

e$B$A$J$\_$K%3%s%Q%$%i$N%P!\<%8%g%s$O$3$s$J46$8$G$7$?!#e(B

$ gcc --version|head -1  
gcc (GCC) 3.3.5 (Debian 1:3.3.5-13)

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