# Floating point exception (core dumped) ./ruby -ve 'r = 0\*\*-1; p r + r'

**URL:** <https://www.ruby-forum.com/t/floating-point-exception-core-dumped-ruby-ve-r-0-1-p-r-r/135962>\
**Category:** Development\
**Created:** [April 27, 2008, 4:02am UTC](https://www.ruby-forum.com/t/floating-point-exception-core-dumped-ruby-ve-r-0-1-p-r-r/135962 "2008-04-27T04:02:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**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:** [April 27, 2008, 4:02am UTC](https://www.ruby-forum.com/t/floating-point-exception-core-dumped-ruby-ve-r-0-1-p-r-r/135962/1 "2008-04-27T04:02:20Z")

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e$B0J2\<$N$h$&$K$9$k$H!"e(Bfloating point exception e$B$K$J$j$^$9!#e(B

% ./ruby -ve ‘r = 0\*\*-1; p r + r’  
ruby 1.9.0 (2008-04-26 revision 16213) [i686-linux]  
zsh: floating point exception (core dumped) ./ruby -ve 'r = 0\*\*-1; p r

- r’  
% gdb ruby core.18246  
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”.

warning: Can’t read pathname for load map:  
e$BF~NOe(B/e$B=PNO%(%i!\<$G$9e(B.  
Reading symbols from /lib/tls/i686/cmov/libpthread.so.0…done.  
Loaded symbols for /lib/tls/i686/cmov/libpthread.so.0  
Reading symbols from /lib/tls/i686/cmov/librt.so.1…done.  
Loaded symbols for /lib/tls/i686/cmov/librt.so.1  
Reading symbols from /lib/tls/i686/cmov/libdl.so.2…done.  
Loaded symbols for /lib/tls/i686/cmov/libdl.so.2  
Reading symbols from /lib/tls/i686/cmov/libcrypt.so.1…done.  
Loaded symbols for /lib/tls/i686/cmov/libcrypt.so.1  
Reading symbols from /lib/tls/i686/cmov/libm.so.6…done.  
Loaded symbols for /lib/tls/i686/cmov/libm.so.6  
Reading symbols from /lib/tls/i686/cmov/libc.so.6…done.  
Loaded symbols for /lib/tls/i686/cmov/libc.so.6  
Reading symbols from /lib/ld-linux.so.2…Reading symbols from  
/usr/lib/debug/lib/ld-2.3.6.so…done.  
done.  
Loaded symbols for /lib/ld-linux.so.2  
Reading symbols from  
/home/akr/ruby/yarvo0/lib/ruby/1.9.0/i686-linux/enc/encdb.so…done.  
Loaded symbols for  
/home/akr/ruby/yarvo0/lib/ruby/1.9.0/i686-linux/enc/encdb.so  
Reading symbols from  
/home/akr/ruby/yarvo0/lib/ruby/1.9.0/i686-linux/enc/trans/transdb.so…done.  
Loaded symbols for  
/home/akr/ruby/yarvo0/lib/ruby/1.9.0/i686-linux/enc/trans/transdb.so  
Reading symbols from  
/home/akr/ruby/yarvo0/lib/ruby/1.9.0/i686-linux/enc/euc\_jp.so…done.  
Loaded symbols for  
/home/akr/ruby/yarvo0/lib/ruby/1.9.0/i686-linux/enc/euc\_jp.so  
Core was generated by `./ruby -ve r = 0\*\*-1; p r + r’.  
Program terminated with signal 8, Arithmetic exception.  
#0 0x080acb6c in f\_addsub (self=135969500, anum=3, aden=1, bnum=3,  
bden=1, k=43) at rational.c:632  
632 VALUE a = f\_imul(an, bd / ig);  
(gdb) bt  
#0 0x080acb6c in f\_addsub (self=135969500, anum=3, aden=1, bnum=3,  
bden=1, k=43) at rational.c:632  
#1 0x080ac9d9 in nurat\_add (self=135969500, other=135969500) at  
rational.c:686  
#2 0x0810af7b in call\_cfunc (func=0x80ac8f0 \<nurat\_add\>,  
recv=135969500, len=1, argc=1, argv=0xb7abc02c)  
at vm\_insnhelper.c:288  
#3 0x08112a82 in vm\_call\_cfunc (th=0x81a99c8, reg\_cfp=0xb7b3bf60,  
num=1, id=43, recv=135969500, klass=136024360, flag=0,  
mn=0x81b8f20, blockptr=0x0) at vm\_insnhelper.c:372  
#4 0x081125cc in vm\_call\_method (th=0x81a99c8, cfp=0xb7b3bf60, num=1,  
blockptr=0x0, flag=0, id=43, mn=0x81b8f0c,  
recv=135969500, klass=136024360) at vm\_insnhelper.c:504  
#5 0x0810f869 in vm\_eval (th=0x81a99c8, initial=0) at insns.def:1408  
#6 0x08112c5b in vm\_eval\_body (th=0x81a99c8) at vm.c:1147  
#7 0x081132b3 in rb\_iseq\_eval (iseqval=135969720) at vm.c:1356  
#8 0x0805b94f in ruby\_exec\_node (n=0x81abbb8, file=0x0) at eval.c:227  
#9 0x0805b9f2 in ruby\_run\_node (n=0x81abbb8) at eval.c:255  
#10 0x08058a88 in main (argc=3, argv=0xbfa8e464, envp=0xbfa8e474) at  
main.c:35  
(gdb) p ig  
$1 = 0  
(gdb) p bd  
$2 = 0  
(gdb) p an  
$3 = 1  
(gdb)

---

<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:** [April 27, 2008, 12:19pm UTC](https://www.ruby-forum.com/t/floating-point-exception-core-dumped-ruby-ve-r-0-1-p-r-r/135962/2 "2008-04-27T12:19:51Z")

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