nobu	2016-12-27 20:43:34 +0900 (Tue, 27 Dec 2016)

  New Revision: 57224

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=57224

  Log:
    io.c: fix race between read and close
    
    * io.c (io_fillbuf): fix race between read and close and bail out
      in the case the IO gets closed before the reading thread achieve
      the lock.  [ruby-core:78845] [Bug #13076]

  Modified files:
    trunk/io.c
Index: io.c
===================================================================
--- io.c	(revision 57223)
+++ io.c	(revision 57224)
@@ -1775,6 +1775,7 @@ io_fillbuf(rb_io_t *fptr) https://github.com/ruby/ruby/blob/trunk/io.c#L1775
 		rb_syserr_fail_path(e, path);
 	    }
         }
+	if (r > 0) rb_io_check_closed(fptr);
         fptr->rbuf.off = 0;
         fptr->rbuf.len = (int)r; /* r should be <= rbuf_capa */
         if (r == 0)

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