From: nobu@...
Date: 2020-01-28T00:58:22+00:00
Subject: [ruby-core:97009] [Ruby master Bug#16598] Backport af899503 to	ruby_2_7

Issue #16598 has been updated by nobu (Nobuyoshi Nakada).

Description updated

A patch without gc.rb.

```diff
commit 030a30a0dc301e79b147233d2142822915f7dde9
Author:     Nobuyoshi Nakada <nobu@ruby-lang.org>
AuthorDate: 2020-01-27 10:46:57 +0900
Commit:     Nobuyoshi Nakada <nobu@ruby-lang.org>
CommitDate: 2020-01-28 09:49:53 +0900

    Fixed a segfault `GC.verify_compaction_references`
    
    Which is by coercion of `Qundef`, when any keyword argument
    without `toward:` option is given.  [Bug #16598]

diff --git a/gc.c b/gc.c
index 131ffb8246..4704925abc 100644
--- a/gc.c
+++ b/gc.c
@@ -8618,7 +8618,7 @@ gc_compact_after_gc(rb_objspace_t *objspace, int use_toward_empty, int use_doubl
 
 /*
  *  call-seq:
- *     GC.verify_compaction_references                  -> nil
+ *     GC.verify_compaction_references(toward: nil, double_heap: nil) -> nil
  *
  *  Verify compaction reference consistency.
  *
@@ -8656,7 +8656,7 @@ gc_verify_compaction_references(int argc, VALUE *argv, VALUE mod)
         }
 
         rb_get_kwargs(opt, keyword_ids, 0, 2, kwvals);
-        if (rb_intern("empty") == rb_sym2id(kwvals[0])) {
+        if (kwvals[0] != Qundef && rb_intern("empty") == rb_sym2id(kwvals[0])) {
             use_toward_empty = TRUE;
         }
         if (kwvals[1] != Qundef && RTEST(kwvals[1])) {
diff --git a/test/ruby/test_gc_compact.rb b/test/ruby/test_gc_compact.rb
index e93e775279..75d9b01f2c 100644
--- a/test/ruby/test_gc_compact.rb
+++ b/test/ruby/test_gc_compact.rb
@@ -39,6 +39,8 @@
     hash = list_of_objects.hash
     GC.verify_compaction_references(toward: :empty)
     assert_equal hash, list_of_objects.hash
+    GC.verify_compaction_references(double_heap: false)
+    assert_equal hash, list_of_objects.hash
   end
 
   def walk_ast ast
```

----------------------------------------
Bug #16598: Backport af899503 to ruby_2_7
https://bugs.ruby-lang.org/issues/16598#change-84095

* Author: nagachika (Tomoyuki Chikanaga)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: -
* Backport: 2.5: DONTNEED, 2.6: DONTNEED, 2.7: REQUIRED
----------------------------------------
nobu said that the fix at [af899503] is also necessary for ruby_2_7 branch.

[af899503]: https://bugs.ruby-lang.org/projects/ruby-master/repository/git/revisions/af899503



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