# \[Bug:1.9\] Enumerator.new { }.take(1).inject(&:+) causes stack overflow

**URL:** <https://www.ruby-forum.com/t/bug-1-9-enumerator-new-take-1-inject-causes-stack-overflow/168502>\
**Category:** Development\
**Created:** [May 21, 2009, 3:55pm UTC](https://www.ruby-forum.com/t/bug-1-9-enumerator-new-take-1-inject-causes-stack-overflow/168502 "2009-05-21T15:55:16Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Yusuke\_ENDOH](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/c89c15/32.png) [@Yusuke\_ENDOH](https://www.ruby-forum.com/u/Yusuke_ENDOH)\
**Post date:** [May 21, 2009, 3:55pm UTC](https://www.ruby-forum.com/t/bug-1-9-enumerator-new-take-1-inject-causes-stack-overflow/168502/1 "2009-05-21T15:55:16Z")

</div>

e$B1sF#$G$9!#e(B

e$B0J2\<$N$h$&$K$9$k$H!"Ff$Ne(B SystemStackError e$B$,=P$F$-$^$9!#e(B

$ ./ruby -ve ‘Enumerator.new { }.take(1).inject(&:+)’  
ruby 1.9.2dev (2009-05-19 trunk 23489) [i686-linux]  
-e:1:in `proc': stack level too deep (SystemStackError) from -e:1:in`to\_proc’  
from -e:1:in `’

1.9.1-p0 e$B$G$bF1$8$G$7$?!#e(B

e$BD4$Y$F$_$?$H$3$m!"8=:_$N%V%m%C%/$Ne(B cfp-\>lfp[0]  
e$B$,;X$9%V%m%C%/$,e(B  
e$B\<+J,\<+?H$K$J$C$F$$$k$h$&$G$9e(B (e$B@53N$K$O!“B\>$N%V%m%C%/$r2r$7$Fe(B  
e$B4V@\E\*$K=[4D$7$F$$$k$h$&$G$7$?e(B) e$B!#e(B  
e$B$=$N$;$$$G!“e(Bvm.c e$B$Ne(B rb\_vm\_make\_proc e$B$He(B  
vm\_make\_proc\_from\_block e$B$,e(B  
e$BAj8\_$K8F$S=P$7$”$C$FL58B:F5”$7$F$$$k$h$&$G$9!#e(B

cfp-\>lfp[0] e$B$,$\*$+$7$/$J$k860x$O$?$V$se(B enumerator.c e$B$G!"e(B

- yielder\_new e$B$,e(B rb\_iterate(yielder\_new\_i, …) e$B$r8F$Ve(B
- passed\_block e$B$,@\_Dj$5$l$ke(B
- yielder\_new\_i e$B$Oe(B Ruby e$B%l%Y%k$N%a%=%C%I$r8F$P$:$K=\*N;$9$ke(B
- passed\_block e$B$,@\_Dj$5$l$?$^$^!"e(Byielder\_new e$B$,=\*$o$j!"e(BYARV  
e$B$Ne(B  
eval e$B%k!\<%W$KLa$ke(B
- passed\_block e$B$,$I$3$+JQ$J$H$3$m$Ge(B cfp-\>lfp[0] e$B$KBeF~$5$l$ke(B

e$B$H$$$&N.$l$K$J$C$F$$$k$h$&$K46$8$^$7$?e(B (yielder  
e$B$,$I$s$J$b$N$+$Oe(B  
e$B$h$/$o$+$C$F$$$^$;$se(B) e$B!#e(B

e$B$=$3$G!"0J2\<$N$h$&$K!"e(Byielder\_new\_i e$B$Ge(B proc  
e$B%a%=%C%I$r8F$V$3$H$Ge(B  
e$B%P%0$OD\>$j$^$7$?!#e(B

# Index: enumerator.c

— enumerator.c (revision 23508)  
+++ enumerator.c (working copy)  
@@ -720,7 +720,7 @@  
static VALUE  
yielder\_new\_i(VALUE dummy)  
{

- return yielder\_init(yielder\_allocate(rb\_cYielder),  
rb\_block\_proc());

- return yielder\_init(yielder\_allocate(rb\_cYielder),  
rb\_funcall(Qnil, rb\_intern(“proc”), 0));  
}

static VALUE

e$B$5$5$@$5$s$,$$$$$H8@$C$F$/$l$?$ie(B (e$B$b$7$/$O2?$b8@$o$J$$$J$ie(B)  
e$B%3%\_%C%H$7$h$&$H;W$$$^$9!#e(B

e$B\>e$K4X78$7$F!“e(BRuby  
e$B$N%=!\<%9%3!\<%I$K$O0J2\<$N%”%5!\<%7%g%s$,0EL[$Ke(B  
e$BB8:\_$9$k$H;W$C$?$N$G$9$,!"@5$7$$$G$7$g$&$+!#e(B

- passed\_block e$B$,@\_Dj$5$l$?$i!"e(Beval e$B%k!\<%W$KLa$kA0$Ke(B Ruby  
e$B%l%Y%k$Ne(B  
e$B%a%=%C%I$r8F$s$Ge(B passed\_block e$B$r2s\<}$5$;$J$$$H$$$1$J$$e(B

- rb\_iterate e$B$de(B rb\_block\_call  
e$B$NBh0l0z?t$KEO$5$l$k4X?t$O!"$=$NCf$Ge(B  
Ruby e$B%l%Y%k$N%a%=%C%I$r8F$P$J$$$H$$$1$J$$e(B

e$B8e\<T$Oe(B C API e$B$K4X$o$kOC$J$N$G!"@5$7$$$h$&$J$ie(B README.EXT  
e$B$K=q$-e(B  
e$B2C$($?J}$,$$$$$H;W$$$^$9!#$H$$$&$+=q$-2C$($h$&$H;W$$$^$9!#e(B

---

<div class="post-metadata">

**Author:** ![Yusuke\_ENDOH](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/c89c15/32.png) [@Yusuke\_ENDOH](https://www.ruby-forum.com/u/Yusuke_ENDOH)\
**Post date:** [May 21, 2009, 10:40pm UTC](https://www.ruby-forum.com/t/bug-1-9-enumerator-new-take-1-inject-causes-stack-overflow/168502/2 "2009-05-21T22:40:44Z")

</div>

e$B!!$5$5$@$G$9!%e(B

Yusuke ENDOH wrote::

> e$B$=$3$G!"0J2\<$N$h$&$K!"e(Byielder\_new\_i e$B$Ge(B proc e$B%a%=%C%I$r8F$V$3$H$Ge(B  
> e$B%P%0$OD\>$j$^$7$?!#e(B

e$B!!;w$?$h$&$JOC$J$s$G$9$,!$$=$b$=$be(B rb\_iterate  
e$B$r;H$&\>lLL$8$c$J$5$=$&$J!%e(B

# Index: enumerator.c

— enumerator.c (e$B%j%S%8%g%se(B 23496)  
+++ enumerator.c (e$B:n6H%3%T!\<e(B)  
@@ -718,12 +718,6 @@  
}

static VALUE  
-yielder\_new\_i(VALUE dummy)  
-{

- return yielder\_init(yielder\_allocate(rb\_cYielder),  
rb\_block\_proc());  
-}
- 

-static VALUE  
yielder\_yield\_i(VALUE obj, VALUE memo, int argc, VALUE \*argv)  
{  
return rb\_yield\_values2(argc, argv);  
@@ -732,7 +726,7 @@  
static VALUE  
yielder\_new(void)  
{

- return rb\_iterate(yielder\_new\_i, (VALUE)0, yielder\_yield\_i,  
(VALUE)0);

- return yielder\_init(yielder\_allocate(rb\_cYielder),  
rb\_proc\_new(yielder\_yield\_i, 0));  
}

/\*

> e$B\>e$K4X78$7$F!“e(BRuby e$B$N%=!\<%9%3!\<%I$K$O0J2\<$N%”%5!\<%7%g%s$,0EL[$Ke(B  
> e$BB8:\_$9$k$H;W$C$?$N$G$9$,!"@5$7$$$G$7$g$&$+!#e(B
> 
> - passed\_block e$B$,@\_Dj$5$l$?$i!"e(Beval e$B%k!\<%W$KLa$kA0$Ke(B Ruby e$B%l%Y%k$Ne(B  
> e$B%a%=%C%I$r8F$s$Ge(B passed\_block e$B$r2s\<}$5$;$J$$$H$$$1$J$$e(B

yes.

> - rb\_iterate e$B$de(B rb\_block\_call e$B$NBh0l0z?t$KEO$5$l$k4X?t$O!"$=$NCf$Ge(B  
> Ruby e$B%l%Y%k$N%a%=%C%I$r8F$P$J$$$H$$$1$J$$e(B

yes.

> e$B8e\<T$Oe(B C API e$B$K4X$o$kOC$J$N$G!"@5$7$$$h$&$J$ie(B README.EXT e$B$K=q$-e(B  
> e$B2C$($?J}$,$$$$$H;W$$$^$9!#$H$$$&$+=q$-2C$($h$&$H;W$$$^$9!#e(B

e$B!!$3$l$O!$\<B$Oe(B 1.8 e$B0JA0$H$NHs8\_49$NLdBj$@$C$?$s$G$9$h$M!%e(B

e$B!!$3$l$r??LLL$K2r7h$7$h$&$H$9$k$H!$$3$N$h$&$J%l%"%1!\<%9$N$?$a$K%V%m%C%/e(B  
e$B$r%A%’%C%/$9$kA4$F$N%3!\<%I$Ke(B passed\_block  
e$B$r%A%’%C%/$9$k$h$&$KJQ99$9$kI,e(B  
e$BMW$,=P$F$-$F!$$A$g$C$H8=\<BE\*$8$c$J$$$N$G$9!%e(B

e$B!v%U%l!\<%`$r$=$N;~$@$1$$$8$C$A$c$&!$$H$$$&2sHr\<jCJ$,$"$k$h$&$J!$e(B  
e$B!!7y$J$H$3$m$KGH5Z$7$=$&$J!%e(B

e$B!!Nc$($P!$e(Brb\_iterate e$B$Oe(B obsolete  
e$B$K$7$F$7$^$C$F!J@)8BIU$-$GB8:\_!K!$e(B  
rb\_block\_call  
e$B$r;H$&$h$&$K$7$F2\<$5$$!$$H%I%-%e%a%s%H$9$k$N$O$I$s$J$b$s$Ge(B  
e$B$7$g$&$+!%e(B

---

<div class="post-metadata">

**Author:** ![Yusuke\_ENDOH](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/c89c15/32.png) [@Yusuke\_ENDOH](https://www.ruby-forum.com/u/Yusuke_ENDOH)\
**Post date:** [May 22, 2009, 12:41am UTC](https://www.ruby-forum.com/t/bug-1-9-enumerator-new-take-1-inject-causes-stack-overflow/168502/3 "2009-05-22T00:41:25Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:38521] Re: [Bug:1.9] Enumerator.new {  
}.take(1).inject(&:+) causes stack overflow”  
on Fri, 22 May 2009 05:39:46 +0900, SASADA Koichi [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
writes:

|e$B!!$3$l$O!$\<B$Oe(B 1.8 e$B0JA0$H$NHs8\_49$NLdBj$@$C$?$s$G$9$h$M!%e(B  
|  
|e$B!!$3$l$r??LLL$K2r7h$7$h$&$H$9$k$H!$$3$N$h$&$J%l%“%1!\<%9$N$?$a$K%V%m%C%/e(B  
|e$B$r%A%‘%C%/$9$kA4$F$N%3!\<%I$Ke(B passed\_block e$B$r%A%’%C%/$9$k$h$&$KJQ99$9$kI,e(B  
|e$BMW$,=P$F$-$F!$$A$g$C$H8=\<BE\*$8$c$J$$$N$G$9!%e(B  
|  
|e$B!v%U%l!\<%`$r$=$N;~$@$1$$$8$C$A$c$&!$$H$$$&2sHr\<jCJ$,$”$k$h$&$J!$e(B  
|e$B!!7y$J$H$3$m$KGH5Z$7$=$&$J!%e(B  
|  
|  
|e$B!!Nc$($P!$e(Brb\_iterate e$B$Oe(B obsolete e$B$K$7$F$7$^$C$F!J@)8BIU$-$GB8:\_!K!$e(B  
|rb\_block\_call e$B$r;H$&$h$&$K$7$F2\<$5$$!$$H%I%-%e%a%s%H$9$k$N$O$I$s$J$b$s$Ge(B  
|e$B$7$g$&$+!%e(B

e$B$^$“!”$=$l$O$=$l$G9=$$$^$;$s!#e(B

---

<div class="post-metadata">

**Author:** ![Yusuke\_ENDOH](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/c89c15/32.png) [@Yusuke\_ENDOH](https://www.ruby-forum.com/u/Yusuke_ENDOH)\
**Post date:** [May 22, 2009, 3:00am UTC](https://www.ruby-forum.com/t/bug-1-9-enumerator-new-take-1-inject-causes-stack-overflow/168502/4 "2009-05-22T03:00:33Z")

</div>

e$B1sF#$G$9!#e(B

2009/05/22 5:39 SASADA Koichi [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> Yusuke ENDOH wrote::
> 
> > e$B$=$3$G!"0J2\<$N$h$&$K!"e(Byielder\_new\_i e$B$Ge(B proc e$B%a%=%C%I$r8F$V$3$H$Ge(B  
> > e$B%P%0$OD\>$j$^$7$?!#e(B
> 
> e$B!!;w$?$h$&$JOC$J$s$G$9$,!$$=$b$=$be(B rb\_iterate e$B$r;H$&\>lLL$8$c$J$5$=$&$J!%e(B

e$B3N$+$K!#$5$5$@$5$s$N%Q%C%A$G$bD\>$k$3$H$r3NG’$7$^$7$?!#e(B

> e$BNc$($P!$e(Brb\_iterate e$B$Oe(B obsolete e$B$K$7$F$7$^$C$F!J@)8BIU$-$GB8:\_!K!$e(B  
> rb\_block\_call e$B$r;H$&$h$&$K$7$F2\<$5$$!$$H%I%-%e%a%s%H$9$k$N$O$I$s$J$b$s$Ge(B  
> e$B$7$g$&$+!%e(B

e$B$J$k$[$I!"e(Brb\_block\_call e$B$OI,$:%a%=%C%I$r8F$S=P$9$+$iBg\>fIWe(B  
e$B$J$s$G$9$M!#e(B

e$B%I%-%e%a%s%H=$@50F$N%Q%C%A$G$9!#e(B

# Index: README.EXT

— README.EXT (revision 23508)  
+++ README.EXT (working copy)  
@@ -1159,11 +1159,22 @@

\*\* Control Structure

- VALUE rb\_iterate(VALUE (\*func1)(), void \*arg1, VALUE (\*func2)(), void  
\*arg2)

- VALUE rb\_block\_call(VALUE recv, ID mid, int argc, VALUE \* argv,
- 

```
    VALUE (*func) (ANYARGS), VALUE data2)

```

+Calls a method on the recv, with the method name specified by the  
+symbol mid, supplying func as the block. func will receive the  
+value from yield as the first argument, data2 as the second, and  
+argc/argv as the third/fourth arguments.  
+

- [OBSOLETE] VALUE rb\_iterate(VALUE (\*func1)(), void \*arg1, VALUE  
(\*func2)(), void \*arg2)
- 

Calls the function func1, supplying func2 as the block. func1 will be  
called with the argument arg1. func2 receives the value from yield as  
the first argument, arg2 as the second argument.  
+  
+When rb\_iterate is used in 1.9, func1 has to call some Ruby-level  
method.  
+This function is obsolete since 1.9; use rb\_block\_call instead.

VALUE rb\_yield(VALUE val)

# Index: README.EXT.ja

— README.EXT.ja (revision 23508)  
+++ README.EXT.ja (working copy)  
@@ -1258,11 +1258,22 @@

\*\* e$B@)8f9=B$e(B

-VALUE rb\_iterate(VALUE (\*func1)(), VALUE arg1, VALUE (\*func2)(), VALUE  
arg2)  
+VALUE rb\_block\_call(VALUE obj, ID mid, int argc, VALUE \* argv,

- 

```
   VALUE (*func) (ANYARGS), VALUE data2)

```

- funce$B$r%V%m%C%/$H$7$F@\_Dj$7e(B, obje$B$r%l%7!\<%Pe(B,  
argce$B$He(Bargve$B$r0ze(B

- e$B?t$H$7$Fe(Bmide$B%a%=%C%I$r8F$S=P$9e(B.  
funce$B$OBh0l0z?t$Ke(Byielde$B$5$l$?e(B

- e$BCMe(B, e$BBhFs0z?t$Ke(Bdata2, e$BBh;0e(B,  
e$BBh;M0z?t$Ke(Bargce$B$He(Bargve$B$r\<u$1\<h$ke(B.

- 

+[OBSOLETE] VALUE rb\_iterate(VALUE (\*func1)(), VALUE arg1, VALUE  
(\*func2)(), VALUE arg2)  
+  
func2e$B$r%V%m%C%/$H$7$F@\_Dj$7e(B,  
func1e$B$r%$%F%l!\<%?$H$7$F8F$V!%e(B  
func1e$B$K$Oe(B arg1e$B$,0z?t$H$7$FEO$5$le(B,  
func2e$B$K$OBhe(B1e$B0z?t$K%$%F%l!\<e(B  
e$B%?$+$iM?$($i$l$?CMe(B, e$BBhe(B2e$B0z?t$Ke(Barg2e$B$,EO$5$l$k!%e(B  
+

- 1.9e$B$Ge(Brb\_iteratee$B$r;H$&\>l9g$Oe(B,  
func1e$B$NCf$Ge(BRubye$B%l%Y%k$N%a%=%C%Ie(B
- e$B$r8F$S=P$5$J$1$l$P$J$i$J$$e(B.
- 1.9e$B$Ge(Bobsoletee$B$H$J$C$?e(B.  
e$BBe$o$j$Ke(Brb\_block\_calle$B$,MQ0U$5$l$?e(B.

VALUE rb\_yield(VALUE val)

---

<div class="post-metadata">

**Author:** ![Yusuke\_ENDOH](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/c89c15/32.png) [@Yusuke\_ENDOH](https://www.ruby-forum.com/u/Yusuke_ENDOH)\
**Post date:** [June 14, 2009, 11:36pm UTC](https://www.ruby-forum.com/t/bug-1-9-enumerator-new-take-1-inject-causes-stack-overflow/168502/5 "2009-06-14T23:36:25Z")

</div>

e$B!!$5$5$@$G$9!%e(B

e$B!!JV;v$,?oJ,CY$/$J$C$F$7$^$C$F$9$\_$^$;$s!%e(B

Yusuke ENDOH wrote::

> e$B$J$k$[$I!"e(Brb\_block\_call e$B$OI,$:%a%=%C%I$r8F$S=P$9$+$iBg\>fIWe(B  
> e$B$J$s$G$9$M!#e(B
> 
> e$B%I%-%e%a%s%H=$@50F$N%Q%C%A$G$9!#e(B

e$B!!$h$m$7$$$+$H;W$$$^$7$?!%e(B

---

<div class="post-metadata">

**Author:** ![Yusuke\_ENDOH](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/c89c15/32.png) [@Yusuke\_ENDOH](https://www.ruby-forum.com/u/Yusuke_ENDOH)\
**Post date:** [July 13, 2009, 6:17pm UTC](https://www.ruby-forum.com/t/bug-1-9-enumerator-new-take-1-inject-causes-stack-overflow/168502/6 "2009-07-13T18:17:35Z")

</div>

e$B%A%1%C%He(B #1501 e$B$,99?7$5$l$^$7$?!#e(B (by Yusuke E.)

e$B%9%F!\<%?%9e(B Assignede$B$+$ie(BClosede$B$KJQ99e(B  
e$B?JD=e(B % 0e$B$+$ie(B100e$B$KJQ99e(B

## Applied in changeset r24094.

[http://redmine.ruby-lang.org/issues/show/1501](http://redmine.ruby-lang.org/issues/show/1501)