# SEGV by STDIN.gets(0,0)

**URL:** <https://www.ruby-forum.com/t/segv-by-stdin-gets-0-0/143581>\
**Category:** Development\
**Created:** [July 20, 2008, 9:36pm UTC](https://www.ruby-forum.com/t/segv-by-stdin-gets-0-0/143581 "2008-07-20T21:36:41Z")\
**Posts on this page:** 1\
**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:** [July 20, 2008, 9:36pm UTC](https://www.ruby-forum.com/t/segv-by-stdin-gets-0-0/143581/1 "2008-07-20T21:36:41Z")

</div>

STDIN.gets(0,0) e$B$Ge(B SEGV e$B$7$^$9!#e(B

% ./ruby -e ‘p STDIN.gets(0,0)’  
-e:1: [BUG] Segmentation fault  
ruby 1.9.0 (2008-07-19 revision 18132) [i686-linux]

## – control frame ---------- c:0004 p:---- s:0012 b:0012 l:000011 d:000011 CFUNC :gets c:0003 p:0018 s:0007 b:0006 l:000005 d:000005 TOP -e:1 c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH :private\_class\_method c:0001 p:0000 s:0002 b:0002 l:000001 d:000001 TOP :17

## DBG\> : “-e:1:in `gets'" DBG> : "-e:1:in`'” – backtrace of native function call (Use addr2line) – 0x81026c5 0x8129aee 0x8129b4b 0x80caf42 0xb7fb0440 0x810a161 0x8070ad0 0x8070e20 0x8070e55 0x80f355e 0x80f55ac 0x80f8519 0x80fc42b 0x80fc650 0x805a3bf 0x805bcce 0x8058d65 0xb7e11ea8 0x8058c61

zsh: abort (core dumped) ./ruby -e ‘p STDIN.gets(0,0)’  
nute(4:34:53)% gdb ruby core.18834  
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: Input/output error.  
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 /lib/libgcc\_s.so.1…done.  
Loaded symbols for /lib/libgcc\_s.so.1  
Core was generated by `./ruby -e p STDIN.gets(0,0)’.  
Program terminated with signal 6, Aborted.  
#0 0xb7fb0410 in ?? ()  
(gdb) bt  
#0 0xb7fb0410 in ?? ()  
#1 0xbfb9681c in ?? ()  
#2 0x00000006 in ?? ()  
#3 0x00004992 in ?? ()  
#4 0xb7e25811 in raise () from /lib/tls/i686/cmov/libc.so.6  
#5 0xb7e26fb9 in abort () from /lib/tls/i686/cmov/libc.so.6  
#6 0x08129b50 in rb\_bug (fmt=0x8156dcd “Segmentation fault”) at  
error.c:226  
#7 0x080caf42 in sigsegv (sig=11) at signal.c:564  
#8 0xb7fb0440 in ?? ()  
#9 0x0000000b in ?? ()  
#10 0xbfb969ac in ?? ()  
#11 0xbfb96a2c in ?? ()  
#12 0x0000000b in ?? ()  
#13 0x00000000 in ?? ()  
(gdb)