[ruby-dev:25251] 1.8 IO#eof? dumps core

次のようにすると core を吐きます。

% ./ruby -e '
r, w = IO.pipe
pid = fork {
  sleep 0.1
  Process.kill("USR1", Process.ppid)
}
trap("USR1") { r.close }
p r.eof?
'
-e:8: [BUG] Segmentation fault
ruby 1.8.2 (2004-12-18) [i686-linux]

zsh: abort (core dumped)  ./ruby -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 -e 
r, w = IO.pipe
pid = fork {
  sleep 0.1
  Process.kill("USR1", Proce'.
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
#0  0x4009e6b1 in kill () from /lib/libc.so.6
(gdb) bt
#0  0x4009e6b1 in kill () from /lib/libc.so.6
#1  0x4009e435 in raise () from /lib/libc.so.6
#2  0x4009f978 in abort () from /lib/libc.so.6
#3  0x080cc716 in rb_bug (fmt=0x0) at error.c:214
#4  0x080abc92 in sigsegv (sig=11) at signal.c:446
#5  <signal handler called>
#6  0x400db2fa in clearerr () from /lib/libc.so.6
#7  0x08074259 in rb_io_eof (io=0) at io.c:744
#8  0x080682b1 in call_cfunc (func=0x8074160 <rb_io_eof>, recv=1075608916, len=0, argc=135435472, argv=0x0) at eval.c:5390
#9  0x0805c112 in rb_call0 (klass=1075636796, recv=1075608916, id=7639, oid=0, argc=0, argv=0x0, body=0x401ce294, 
    nosuper=0) at eval.c:5522
#10 0x0805c968 in rb_call (klass=1075636796, recv=1075608916, mid=7639, argc=0, argv=0x0, scope=0) at eval.c:5743
#11 0x08057a90 in rb_eval (self=1075673536, n=0x0) at ruby.h:631
#12 0x08057d61 in rb_eval (self=1075673536, n=0x0) at ruby.h:636
#13 0x0805406d in ruby_exec_internal () at eval.c:1473
#14 0x080540a6 in ruby_exec () at eval.c:1493
#15 0x080540d0 in ruby_run () at eval.c:1503
#16 0x08052245 in main (argc=0, argv=0x0, envp=0xbffff914) at main.c:46
(gdb) 
-- 
[田中 哲][たなか あきら][Tanaka Akira]