https://git.ruby-lang.org/ruby.git/commit/?id=29e42b8bfd

From 29e42b8bfdfc7a2d879a4ddb1db3d4453d66143a Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Fri, 18 Dec 2020 08:25:24 +0900
Subject: add explicit check

To debug this issue:
https://rubyci.org/logs/rubyci.s3.amazonaws.com/solaris10-gcc/ruby-master/log/20201217T220004Z.fail.html.gz

diff --git a/gc.c b/gc.c
index f6bfaf6..f59ac6a 100644
--- a/gc.c
+++ b/gc.c
@@ -8439,12 +8439,12 @@ gc_enter_count(enum gc_enter_event event) https://github.com/ruby/ruby/blob/trunk/gc.c#L8439
 static inline void
 gc_enter(rb_objspace_t *objspace, enum gc_enter_event event, unsigned int *lock_lev)
 {
-    // stop other ractors
     RB_VM_LOCK_ENTER_LEV(lock_lev);
 
     switch (event) {
       case gc_enter_event_start:
       case gc_enter_event_mark_continue:
+        // stop other ractors
         rb_vm_barrier();
         break;
       default:
@@ -8452,7 +8452,7 @@ gc_enter(rb_objspace_t *objspace, enum gc_enter_event event, unsigned int *lock_ https://github.com/ruby/ruby/blob/trunk/gc.c#L8452
     }
 
     gc_enter_count(event);
-    GC_ASSERT(during_gc == 0);
+    if (UNLIKELY(during_gc != 0)) rb_bug("during_gc != 0");
     if (RGENGC_CHECK_MODE >= 3) gc_verify_internal_consistency(objspace);
 
     mjit_gc_start_hook();
-- 
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