# SEGV by IO.pipe

**URL:** <https://www.ruby-forum.com/t/segv-by-io-pipe/123044>\
**Category:** Development\
**Created:** [December 13, 2007, 4:39pm UTC](https://www.ruby-forum.com/t/segv-by-io-pipe/123044 "2007-12-13T16:39:00Z")\
**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:** [December 13, 2007, 4:39pm UTC](https://www.ruby-forum.com/t/segv-by-io-pipe/123044/1 "2007-12-13T16:39:00Z")

</div>

e$B0J2\<$N$h$&$K$9$k$He(B SEGV e$B$7$^$9!#e(B

## % ./ruby -ve ’ class IO def initialize(\*x) end end IO.pipe ’ ruby 1.9.0 (2007-12-13 patchlevel 0) [i686-linux] -e:3: warning: method redefined; discarding old initialize -e:6: – control frame ---------- c:0004 p:---- s:0008 b:0008 l:000007 d:000007 CFUNC :pipe c:0003 p:0020 s:0005 b:0005 l:000004 d:000004 TOP -e:6 c:0002 p:---- s:0003 b:0003 l:000002 d:000002 FINISH :inherited c:0001 p:---- s:0001 b:-001 l:000000 d:000000 ------

## DBG\> : “-e:6:in `’” – backtrace of native function call (Use addr2line) – 0x80e7e20 0x8104679 0x8104712 0x80b9b90 0xffffe440 0x8070e96 0x80e5b21 0x80e70ac 0x80e6252 0x80e176b 0x80e47f0 0x80e4bba 0x805b1b9 0x805b23a 0x8058379 0xb7db6974 0x8058271

[BUG] Segmentation fault  
ruby 1.9.0 (2007-12-13) [i686-linux]

zsh: abort (core dumped) ./ruby -ve ’ class IO def initialize(\*x)  
end end IO.pipe ’  
% gdb ruby core.1439  
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 -ve  
class IO  
def initialize(\*x)  
end  
end  
IO.pipe  
'.  
Program terminated with signal 6, Aborted.

warning: current\_sos: Can’t read pathname for load map: Input/output  
error

Reading symbols from /lib/tls/libpthread.so.0…Reading symbols from  
/usr/lib/debug/lib/tls/libpthread-0.60.so…done.  
done.  
Loaded symbols for /lib/tls/libpthread.so.0  
Reading symbols from /lib/tls/librt.so.1…Reading symbols from  
/usr/lib/debug/lib/tls/librt-2.3.2.so…done.  
done.  
Loaded symbols for /lib/tls/librt.so.1  
Reading symbols from /lib/tls/libdl.so.2…Reading symbols from  
/usr/lib/debug/lib/tls/libdl-2.3.2.so…done.  
done.  
Loaded symbols for /lib/tls/libdl.so.2  
Reading symbols from /lib/tls/libcrypt.so.1…Reading symbols from  
/usr/lib/debug/lib/tls/libcrypt-2.3.2.so…done.  
done.  
Loaded symbols for /lib/tls/libcrypt.so.1  
Reading symbols from /lib/tls/libm.so.6…Reading symbols from  
/usr/lib/debug/lib/tls/libm-2.3.2.so…done.  
done.  
Loaded symbols for /lib/tls/libm.so.6  
Reading symbols from /lib/tls/libc.so.6…Reading symbols from  
/usr/lib/debug/lib/tls/libc-2.3.2.so…done.  
done.  
Loaded symbols for /lib/tls/libc.so.6  
Reading symbols from /lib/ld-linux.so.2…Reading symbols from  
/usr/lib/debug/lib/ld-2.3.2.so…done.  
done.  
Loaded symbols for /lib/ld-linux.so.2  
#0 0xb7dc983b in raise () from /lib/tls/libc.so.6  
(gdb) bt  
#0 0xb7dc983b in raise () from /lib/tls/libc.so.6  
#1 0xb7dcafa2 in abort () from /lib/tls/libc.so.6  
#2 0x08104717 in rb\_bug (fmt=0x6 \<Address 0x6 out of bounds\>) at  
error.c:228  
#3 0x080b9b90 in sigsegv (sig=11) at signal.c:541  
#4  
#5 rb\_io\_synchronized (fptr=0x0) at io.c:3304  
#6 0x08070e96 in rb\_io\_s\_pipe (klass=0) at io.c:5517  
#7 0x080e5b21 in call\_cfunc (func=0x8070e00 \<rb\_io\_s\_pipe\>,  
recv=3083910060, len=0, argc=-1078132748, argv=0xb7d1f020)  
at insnhelper.ci:286  
#8 0x080e70ac in vm\_call\_cfunc (th=0x8172160, reg\_cfp=0xb7d9ef60,  
num=0, id=5440, recv=3083910060, klass=3083910040,  
flag=97, mn=0xb7d0b8c8, blockptr=0x0) at insnhelper.ci:373  
#9 0x080e6252 in vm\_call\_method (th=0x8172160, cfp=0xb7d9ef60, num=0,  
blockptr=0x0, flag=0, id=5440, mn=0x0,  
recv=3083910060, klass=3083910040) at insnhelper.ci:505  
#10 0x080e176b in vm\_eval (th=0x8172160, initial=0) at insns.def:1069  
#11 0x080e47f0 in vm\_eval\_body (th=0x8172160) at vm.c:1163  
#12 0x080e4bba in rb\_iseq\_eval (iseqval=3083817080) at vm.c:1372  
#13 0x0805b1b9 in ruby\_exec\_node (n=0xb7cf50f0, file=0x81bb441 “-e”) at  
eval.c:232  
#14 0x0805b23a in ruby\_run\_node (n=0xb7cf50f0) at eval.c:262  
#15 0x08058379 in main (argc=3, argv=0xbfbd0614, envp=0xbfbd0624) at  
main.c:30  
(gdb)