normal	2018-12-06 19:09:30 +0900 (Thu, 06 Dec 2018)

  New Revision: 66242

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66242

  Log:
    io.c (io_write_nonblock): add RB_GC_GUARD, io_fflush may switch threads
    
    Since io_fflush may block on mutex or rb_io_wait_readable and
    switch threads, we need to ensure the `str' VALUE returned by
    `rb_obj_as_string` is visible to GC.

  Modified files:
    trunk/io.c
Index: io.c
===================================================================
--- io.c	(revision 66241)
+++ io.c	(revision 66242)
@@ -3001,6 +3001,7 @@ io_write_nonblock(VALUE io, VALUE str, V https://github.com/ruby/ruby/blob/trunk/io.c#L3001
 
     rb_io_set_nonblock(fptr);
     n = write(fptr->fd, RSTRING_PTR(str), RSTRING_LEN(str));
+    RB_GC_GUARD(str);
 
     if (n < 0) {
 	int e = errno;

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