# \[Bug #943\] Segmentation fault (cygwin)

**URL:** <https://www.ruby-forum.com/t/bug-943-segmentation-fault-cygwin/156501>\
**Category:** Development\
**Created:** [December 29, 2008, 7:53am UTC](https://www.ruby-forum.com/t/bug-943-segmentation-fault-cygwin/156501 "2008-12-29T07:53:32Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Martin\_DSSS\_rst](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e9c0ed/32.png) [@Martin\_DSSS\_rst](https://www.ruby-forum.com/u/Martin_DSSS_rst)\
**Post date:** [December 29, 2008, 7:53am UTC](https://www.ruby-forum.com/t/bug-943-segmentation-fault-cygwin/156501/1 "2008-12-29T07:53:32Z")

</div>

Bug #943: Segmentation fault (cygwin)  
[http://redmine.ruby-lang.org/issues/show/943](http://redmine.ruby-lang.org/issues/show/943)

e$B5/I\<\<Te(B: Martin De$(D+de(Brst  
e$B%9%F!\<%?%9e(B: Open, e$BM%@hEYe(B: Normal

e$B\<!$N%9%/%j%W%H$,e(B Segmentation fault (core dumped)  
e$B$G=\*$o$j$^$9!#e(B

ruby -e ‘puts “A=[”; 0.upto(1000000) { puts " [22, 55]," }; puts “]”’ |  
ruby

[ruby-dev:37611] e$B$GJs9p$7$?LdBj$r4JC12=$7$^$7$?!#LdBj$O:8B&$Ne(B ruby  
e$B$N$G$O$J$/!"e(B  
e$B1&B&$Ne(B ruby e$B$G5/$3$j$^$9!#e(B

e$B$h$m$7$/$\*4j$$$7$^$9!#e(B Martin.

---

<div class="post-metadata">

**Author:** ![Martin\_DSSS\_rst](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e9c0ed/32.png) [@Martin\_DSSS\_rst](https://www.ruby-forum.com/u/Martin_DSSS_rst)\
**Post date:** [December 29, 2008, 8:19am UTC](https://www.ruby-forum.com/t/bug-943-segmentation-fault-cygwin/156501/2 "2008-12-29T08:19:15Z")

</div>

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

Martin Du"rst wrote::

> e$B\<!$N%9%/%j%W%H$,e(B Segmentation fault (core dumped) e$B$G=\*$o$j$^$9!#e(B
> 
> ruby -e ‘puts “A=[”; 0.upto(1000000) { puts " [22, 55]," }; puts “]”’ | ruby
> 
> [ruby-dev:37611] e$B$GJs9p$7$?LdBj$r4JC12=$7$^$7$?!#LdBj$O:8B&$Ne(B ruby e$B$N$G$O$J$/!"e(B  
> e$B1&B&$Ne(B ruby e$B$G5/$3$j$^$9!#e(B

e$B!!%9%?%C%/%\*!\<%P!\<%U%m!\<%A%’%C%/$,B-$j$F$$$^$;$s$G$7$?!%B?J,!$$3$l$GD\>$je(B  
e$B$^$9!%\<j85$G$OD\>$j$^$7$?!%e(B[ruby-dev:37611]  
e$B$N$[$&$O;n$7$F$$$J$$$N$G$9e(B  
e$B$,!$8+$F$b$i$($^$;$s$+!%e(B

# Index: vm.c

— vm.c (e$B%j%S%8%g%se(B 21150)  
+++ vm.c (e$B:n6H%3%T!\<e(B)  
@@ -77,6 +77,8 @@ vm\_set\_top\_stack(rb\_thread\_t \* th, VALUE  
vm\_push\_frame(th, iseq, VM\_FRAME\_MAGIC\_TOP,  
th-\>top\_self, 0, iseq-\>iseq\_encoded,  
th-\>cfp-\>sp, 0, iseq-\>local\_size);  
+

- 

```
   CHECK_STACK_OVERFLOW(th->cfp, iseq->stack_max);

```

}

static void  
@@ -95,6 +97,8 @@ vm\_set\_eval\_stack(rb\_thread\_t \* th, VALU  
if (cref) {  
th-\>cfp-\>dfp[-1] = (VALUE)cref;  
}  
+

- CHECK\_STACK\_OVERFLOW(th-\>cfp, iseq-\>stack\_max);  
}

static void  
@@ -116,6 +120,8 @@ vm\_set\_main\_stack(rb\_thread\_t \*th, VALUE  
if (bind && iseq-\>local\_size \> 0) {  
bind-\>env = vm\_make\_env\_object(th, th-\>cfp);  
}  
+

- CHECK\_STACK\_OVERFLOW(th-\>cfp, iseq-\>stack\_max);  
}

rb\_control\_frame\_t \*

---

<div class="post-metadata">

**Author:** ![Martin\_DSSS\_rst](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e9c0ed/32.png) [@Martin\_DSSS\_rst](https://www.ruby-forum.com/u/Martin_DSSS_rst)\
**Post date:** [December 29, 2008, 8:47am UTC](https://www.ruby-forum.com/t/bug-943-segmentation-fault-cygwin/156501/3 "2008-12-29T08:47:26Z")

</div>

e$B%A%1%C%He(B #943 e$B$,99?7$5$l$^$7$?!#e(B (by Koichi Sasada)

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

## Applied in changeset r21163.

[http://redmine.ruby-lang.org/issues/show/943](http://redmine.ruby-lang.org/issues/show/943)

---

<div class="post-metadata">

**Author:** ![Martin\_DSSS\_rst](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e9c0ed/32.png) [@Martin\_DSSS\_rst](https://www.ruby-forum.com/u/Martin_DSSS_rst)\
**Post date:** [December 29, 2008, 9:20am UTC](https://www.ruby-forum.com/t/bug-943-segmentation-fault-cygwin/156501/4 "2008-12-29T09:20:11Z")

</div>

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

Martin D. wrote::

> e$B$KD\>$9$H!";~4V$,$+$+$k$b$N$N!"LdBj$J$/40@.$5$l$^$9!#e(B  
> e$B!!e(B[e1, e2, …, eN] e$B$H$$$&%j%F%i%k$O!$0lEYe(B e1, e2, …, eN  
> e$B$rA4It%9%?%Ce(B  
> e$B%/$K@Q$s$G!$%9%?%C%/\>e$NCM$rMxMQ$7$FG[Ns$r:n$j$^$9!%$=$N$?$a!$%9%?%C%/e(B  
> e$B%\*!\<%P!\<%U%m!\<$K$J$j$^$9!%e(B

e$B!!\>e5-Nc$N$h$&$K!$6u$NG[Ns$r:n$C$F!$$=$l$Ke(B push  
e$B$9$k$h$&$KJQ99$9$k$3$H$be(B  
e$B2DG=$G$9$,!$$=$l$r=PMh$k$h$&$K$7$?$[$&$,$$$$$G$9$+$M$’!%$9$k$K$7$F$b!$e(B  
1.9.2  
e$B$GL?NaDI2C$C$F$3$H$K$J$k$H;W$$$^$9$,!%$=$&JQ99$7$?$i!$$A$g$C$HB.EYe(B  
e$B$,CY$/$J$k$C$F$/$i$$$+$J$!!%e(B

---

<div class="post-metadata">

**Author:** ![Martin\_DSSS\_rst](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e9c0ed/32.png) [@Martin\_DSSS\_rst](https://www.ruby-forum.com/u/Martin_DSSS_rst)\
**Post date:** [December 29, 2008, 9:08am UTC](https://www.ruby-forum.com/t/bug-943-segmentation-fault-cygwin/156501/5 "2008-12-29T09:08:29Z")

</div>

e$B:{ED$5$s!"$3$s$K$A$O!#e(B

At 16:18 08/12/29, SASADA Koichi wrote:

> e$B!!%9%?%C%/%\*!\<%P!\<%U%m!\<%A%'%C%/$,B-$j$F$$$^$;$s$G$7$?!%B?J,!$$3$l$GD\>$je(B  
> e$B$^$9!%\<j85$G$OD\>$j$^$7$?!%e(B[ruby-dev:37611] e$B$N$[$&$O;n$7$F$$$J$$$N$G$9e(B  
> e$B$,!$8+$F$b$i$($^$;$s$+!%e(B

e$B0J2\<$N=$@5$G\>e5-$NLdBj$be(B [ruby-dev:37611] e$B$bD\>$C$F$$$^$9!#e(B  
e$B$H$$$&$N$O!“e(BSegmentation fault e$B$+$ie(B SystemStackError  
e$B$Ke(B  
e$BJQ$o$C$?$@$1$G$9!#$=$NJ}$,$$$$$G$9$N$G!”@'Hs2\<5-$N%Q%C%A$re(B  
e$B%3%\_%C%H$7$F$/$@$5$$!#e(B

e$B$7$+$7!"??$CJ?$i$J%G!\<%?$rFI$\_9~$`$@$1$G%9%?%C%/$,$3$s$J$K?-$S$ke(B  
e$B$N$O$J$\<$G$7$g$&$+!#\>e5-$N%9%/%j%W%H$re(B

ruby -e ‘puts “A=[]”; 0.upto(1000000) { puts “A\<\<[22, 55]” }’ | ruby

e$B$KD\>$9$H!";~4V$,$+$+$k$b$N$N!"LdBj$J$/40@.$5$l$^$9!#e(B

e$B$h$m$7$/$\*4j$$$7$^$9!#e(B Martin.

> }  
> static void
> 
> –  
> // SASADA Koichi at atdot dot net

#-#-# Martin J. Du"rst, Assoc. Professor, Aoyama Gakuin University  
#-#-# [http://www.sw.it.aoyama.ac.jp](http://www.sw.it.aoyama.ac.jp)[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

---

<div class="post-metadata">

**Author:** ![Martin\_DSSS\_rst](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e9c0ed/32.png) [@Martin\_DSSS\_rst](https://www.ruby-forum.com/u/Martin_DSSS_rst)\
**Post date:** [December 30, 2008, 7:59am UTC](https://www.ruby-forum.com/t/bug-943-segmentation-fault-cygwin/156501/6 "2008-12-30T07:59:46Z")

</div>

At 17:19 08/12/29, SASADA Koichi wrote:

> e$B!!$5$5$@$G$9!%e(B
> 
> Martin D. wrote::

> > e$B$7$+$7!"??$CJ?$i$J%G!\<%?$rFI$\_9~$`$@$1$G%9%?%C%/$,$3$s$J$K?-$S$ke(B  
> > e$B$N$O$J$\<$G$7$g$&$+!#\>e5-$N%9%/%j%W%H$re(B
> > 
> > ruby -e ‘puts “A=[]”; 0.upto(1000000) { puts “A\<\<[22, 55]” }’ | ruby
> > 
> > e$B$KD\>$9$H!";~4V$,$+$+$k$b$N$N!"LdBj$J$/40@.$5$l$^$9!#e(B
> 
> e$B!!e(B[e1, e2, …, eN] e$B$H$$$&%j%F%i%k$O!$0lEYe(B e1, e2, …, eN e$B$rA4It%9%?%Ce(B  
> e$B%/$K@Q$s$G!$%9%?%C%/\>e$NCM$rMxMQ$7$FG[Ns$r:n$j$^$9!%$=$N$?$a!$%9%?%C%/e(B  
> e$B%\*!\<%P!\<%U%m!\<$K$J$j$^$9!%e(B

e$B$=$N$0$i$$$OA[A|$,IU$-$^$7$?!#e(B

> e$B!!\>e5-Nc$N$h$&$K!$6u$NG[Ns$r:n$C$F!$$=$l$Ke(B push e$B$9$k$h$&$KJQ99$9$k$3$H$be(B  
> e$B2DG=$G$9$,!$$=$l$r=PMh$k$h$&$K$7$?$[$&$,$$$$$G$9$+$M$'!%$9$k$K$7$F$b!$e(B  
> 1.9.2 e$B$GL?NaDI2C$C$F$3$H$K$J$k$H;W$$$^$9$,!%$=$&JQ99$7$?$i!$$A$g$C$HB.EYe(B  
> e$B$,CY$/$J$k$C$F$/$i$$$+$J$!!%e(B

e$B$3$s$J$K$G$+$$!VDj?t!W$NG[Ns$O$I$N$0$i$$I,MW$K$J$k$N$+$OJ,$+$j$^$;$s$,!“e(B  
e$B!VDj?t$+$iDI2C$K5-=R$rJQ99$7$F$/$@$5$$!#!W$H8@$&I,MW$,$G$F$/$k$N$Oe(B  
e$B2?$H$J$/5U$N$h$&$J5$$,$9$k!#$^$”!"e(B1.9.2  
e$B$H$+$NCJ3,$G$8$C$/$j9M$($?e(B  
e$BJ}$,$$$$$H;W$$$^$9!#e(B

e$B$h$m$7$/$\*4j$$$7$^$9!#e(B Martin.

#-#-# Martin J. Du"rst, Assoc. Professor, Aoyama Gakuin University  
#-#-# [http://www.sw.it.aoyama.ac.jp](http://www.sw.it.aoyama.ac.jp)[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)