From 1d0bf3d8dd8de40d498a7c2784a84aa566d290b9 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Sat, 5 Dec 2020 05:42:44 +0900
Subject: log for the beggining of vm_lock_enter

Before this patch, there is no information to start locking.
---
 vm_sync.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/vm_sync.c b/vm_sync.c
index 8eb2cdf1e9..0a14d5394c 100644
--- a/vm_sync.c
+++ b/vm_sync.c
@@ -41,6 +41,8 @@ rb_vm_locked_p(void)
 static void
 vm_lock_enter(rb_ractor_t *cr, rb_vm_t *vm, bool locked, unsigned int *lev APPEND_LOCATION_ARGS)
 {
+    RUBY_DEBUG_LOG2(file, line, "start locked:%d", locked);
+
     if (locked) {
         ASSERT_vm_locking();
     }
-- 
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