normal	2017-10-24 06:50:08 +0900 (Tue, 24 Oct 2017)

  New Revision: 60384

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60384

  Log:
    thread_pthread: do not corrupt stack
    
    This fixes stuck test/ruby/test_io.rb with FIBER_USE_NATIVE=0 on
    GNU/Linux because linked-list pointers used by glibc get
    corrupted when fiber stacks are copied.
    
    Thanks to wanabe for finding the bug and original patch.
    
    * thread_pthread (native_thread_init_stack): fix stack corruption
      [ruby-core:82737] [Bug #13387]

  Modified files:
    trunk/thread_pthread.c
Index: thread_pthread.c
===================================================================
--- thread_pthread.c	(revision 60383)
+++ thread_pthread.c	(revision 60384)
@@ -836,8 +836,9 @@ native_thread_init_stack(rb_thread_t *th https://github.com/ruby/ruby/blob/trunk/thread_pthread.c#L836
 	size_t size;
 
 	if (get_stack(&start, &size) == 0) {
-	    th->ec.machine.stack_start = start;
-	    th->ec.machine.stack_maxsize = size;
+	    uintptr_t diff = (uintptr_t)start - (uintptr_t)&curr;
+	    th->ec.machine.stack_start = (VALUE *)&curr;
+	    th->ec.machine.stack_maxsize = size - diff;
 	}
 #elif defined get_stack_of
 	if (!th->ec.machine.stack_maxsize) {

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