[ruby-dev:24562] Zlib::GzipReader#read causes core dump

次のようにすると core を吐きます。

% ./ruby -rstringio -rzlib -e '
f = Zlib::GzipWriter.new(StringIO.new(s = ""))
f.write "abc"
f.close
f = Zlib::GzipReader.new(StringIO.new(s))
class << f.read(1)
end
f.close
'
-e:6: [BUG] Segmentation fault
ruby 1.9.0 (2004-10-21) [i686-linux]

zsh: abort (core dumped)  ./ruby -rstringio -rzlib -e 
% gdb ruby core 
GNU gdb 6.1-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/libthread_db.so.1".

Core was generated by `./ruby -rstringio -rzlib -e 
f = Zlib::GzipWriter.new(StringIO.new(s = ""))
f.w'.
Program terminated with signal 6, Aborted.
Reading symbols from /lib/libdl.so.2...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/libcrypt.so.1...done.
Loaded symbols for /lib/libcrypt.so.1
Reading symbols from /lib/libm.so.6...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /home/akr/ruby/head-ruby/lib/ruby/1.9/i686-linux/stringio.so...done.
Loaded symbols for /home/akr/ruby/head-ruby/lib/ruby/1.9/i686-linux/stringio.so
Reading symbols from /home/akr/ruby/head-ruby/lib/ruby/1.9/i686-linux/zlib.so...done.
Loaded symbols for /home/akr/ruby/head-ruby/lib/ruby/1.9/i686-linux/zlib.so
Reading symbols from /usr/lib/libz.so.1...done.
Loaded symbols for /usr/lib/libz.so.1
#0  0x4009e741 in kill () from /lib/libc.so.6
(gdb) bt
#0  0x4009e741 in kill () from /lib/libc.so.6
#1  0x4009e4c5 in raise () from /lib/libc.so.6
#2  0x4009fa08 in abort () from /lib/libc.so.6
#3  0x080d2456 in rb_bug (fmt=0x0) at error.c:214
#4  0x080b03d2 in sigsegv (sig=11) at signal.c:446
#5  <signal handler called>
#6  0x080cc623 in rb_make_metaclass (obj=1075599936, super=0) at class.c:160
#7  0x080cd77c in rb_singleton_class (obj=1075599936) at class.c:871
#8  0x0805a6d4 in rb_eval (self=1075673496, n=0x0) at eval.c:3847
#9  0x080558bd in ruby_exec_internal () at eval.c:1457
#10 0x080558d6 in ruby_exec () at eval.c:1475
#11 0x08055920 in ruby_run () at eval.c:1492
#12 0x080539c5 in main (argc=0, argv=0x0, envp=0xbffff8ec) at main.c:38
(gdb) 
-- 
[田中 哲][たなか あきら][Tanaka Akira]