[ruby-dev:24992] IO#sysread dumps core

次のようにすると core を吐きます。

% ./ruby -ve '
r, w = IO.pipe
pid = fork {
  r.close
  sleep 1
  Process.kill("USR1", Process.ppid)
  sleep 1
  w.syswrite "a"
}
w.close
str = ""
trap("USR1") { str.clear }
p r.sysread(1, str)
Process.wait pid'
ruby 1.9.0 (2004-11-29) [i686-linux]
-e:13: [BUG] Segmentation fault
ruby 1.9.0 (2004-11-29) [i686-linux]

zsh: abort (core dumped)  ./ruby -ve 
% 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 -ve 
r, w = IO.pipe
pid = fork {
  r.close
  sleep 1
  Process.kill("USR'.
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  0x080d5916 in rb_bug (fmt=0x0) at error.c:214
#4  0x080b2982 in sigsegv (sig=11) at signal.c:446
#5  <signal handler called>
#6  0x08079278 in rb_io_sysread (argc=135222327, argv=0x80f5437, io=135222327) at io.c:2341
#7  0x0806aaba in call_cfunc (func=0x8079110 <rb_io_sysread>, recv=1075607176, len=1, argc=135521480, argv=0xbfffea98)
    at eval.c:5388
#8  0x0805e8c2 in rb_call0 (klass=1075636716, recv=1075607176, id=7545, oid=135222327, argc=2, argv=0xbfffea98, 
    body=0x401ce62c, nosuper=0) at eval.c:5529
#9  0x0805eb78 in rb_call (klass=1075636716, recv=1075607176, mid=7545, argc=2, argv=0xbfffea98, scope=0) at eval.c:5750
#10 0x0805993a in rb_eval (self=1075673536, n=0x80f5437) at ruby.h:635
#11 0x08059c6b in rb_eval (self=1075673536, n=0x80f5437) at ruby.h:664
#12 0x08055e8d in ruby_exec_internal () at eval.c:1468
#13 0x08055ea6 in ruby_exec () at eval.c:1486
#14 0x08055ef0 in ruby_run () at eval.c:1503
#15 0x08053ef5 in main (argc=135222327, argv=0x80f5437, envp=0xbffff8d4) at main.c:38
(gdb) 
-- 
[田中 哲][たなか あきら][Tanaka Akira]