* thread.c (thread_start_func_2): check deadlock condition before

	  release thread stack. fix memory violation when deadlock detected.
	  reported by Max Aller. [Bug #4009] [ruby-core:32982]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30743 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 2 deletions

diff --git a/thread.c b/thread.c
index 69fc299fcd..b1a802b89c 100644
--- a/thread.c
+++ b/thread.c
@@ -524,13 +524,14 @@ thread_start_func_2(rb_thread_t *th, VALUE *stack_start, VALUE *register_stack_s
 	    join_th = join_th->join_list_next;
 	}
 
+	thread_unlock_all_locking_mutexes(th);
+	if (th != main_th) rb_check_deadlock(th->vm);
+
 	if (!th->root_fiber) {
 	    rb_thread_recycle_stack_release(th->stack);
 	    th->stack = 0;
 	}
     }
-    thread_unlock_all_locking_mutexes(th);
-    if (th != main_th) rb_check_deadlock(th->vm);
     if (th->vm->main_thread == th) {
 	ruby_cleanup(state);
     }