https://git.ruby-lang.org/ruby.git/commit/?id=ee57920008

From ee579200082329db66e153c465cb8332e55bacb2 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Thu, 5 Dec 2019 15:01:37 +0900
Subject: move an interrupt point.

`args_ptr` can be corrupted by interrupt handlers.
Pointed by nagachika <https://ruby-trunk-changes.hatenablog.com/entry/ruby_trunk_changes_20191204>.

diff --git a/thread.c b/thread.c
index d1bf612..8d4b283 100644
--- a/thread.c
+++ b/thread.c
@@ -681,6 +681,7 @@ thread_do_start(rb_thread_t *th) https://github.com/ruby/ruby/blob/trunk/thread.c#L681
 	th->ec->root_svar = Qfalse;
 
         EXEC_EVENT_HOOK(th->ec, RUBY_EVENT_THREAD_BEGIN, th->self, 0, 0, 0, Qundef);
+        vm_check_ints_blocking(th->ec);
 
         if (args_len < 8) {
             /* free proc.args if the length is enough small */
@@ -693,7 +694,6 @@ thread_do_start(rb_thread_t *th) https://github.com/ruby/ruby/blob/trunk/thread.c#L694
         }
 
         rb_adjust_argv_kw_splat(&args_len, &args_ptr, &kw_splat);
-        vm_check_ints_blocking(th->ec);
         th->value = rb_vm_invoke_proc(th->ec, proc,
                                       args_len, args_ptr,
                                       kw_splat, VM_BLOCK_HANDLER_NONE);
-- 
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