[ruby-dev:24985] IO#flush dumps core

次のようにすると core を吐きます。

% ./ruby -rio/nonblock -de '
r,w = IO.pipe
w.nonblock = true
w.sync = false
w << "b"
w.flush
w << "a" * 4096
Thread.new { Thread.pass
  w.close
}
w.flush 
'
deadlock 0x401d46d0: sleep:S (main) - -e:11
deadlock 0x401c6bc0: sleep:S  - -e:9
Exception `fatal' at -e:9 - Thread(0x401c6bc0): deadlock
-e:9: Thread(0x401c6bc0): deadlock (fatal)
-e:9: [BUG] Segmentation fault
ruby 1.9.0 (2004-11-28) [i686-linux]

zsh: abort (core dumped)  ./ruby -rio/nonblock -de 
% 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 -rio/nonblock -de 
r,w = IO.pipe
w.nonblock = true
w.sync = false
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/fcntl.so...done.
Loaded symbols for /home/akr/ruby/head-ruby/lib/ruby/1.9/i686-linux/fcntl.so
#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  0x080d5796 in rb_bug (fmt=0x0) at error.c:214
#4  0x080b2802 in sigsegv (sig=11) at signal.c:446
#5  <signal handler called>
#6  0x400e2ccc in _IO_do_write () from /lib/libc.so.6
#7  0x400e2bf6 in _IO_do_write () from /lib/libc.so.6
#8  0x400e2889 in _IO_file_close_it () from /lib/libc.so.6
#9  0x400dd578 in fclose () from /lib/libc.so.6
#10 0x400d478b in fclose () from /lib/libc.so.6
#11 0x0807883a in fptr_finalize (fptr=0x813f138, noraise=2) at io.c:1960
#12 0x08078983 in rb_io_fptr_finalize (fptr=0x813f138) at io.c:2004
#13 0x0807211c in rb_gc_call_finalizer_at_exit () at gc.c:1850
#14 0x08055c34 in ruby_finalize_1 () at eval.c:1407
#15 0x08055d43 in ruby_cleanup (ex=1) at eval.c:1442
#16 0x08055ea1 in ruby_stop (ex=1701606176) at eval.c:1491
#17 0x08055eef in ruby_run () at eval.c:1503
#18 0x08053ed5 in main (argc=1701606176, argv=0x656c7320, envp=0xbffff908) at main.c:38
(gdb) 
-- 
[田中 哲][たなか あきら][Tanaka Akira]