https://git.ruby-lang.org/ruby.git/commit/?id=a4d5ee4f31

From a4d5ee4f31bf3ff36c1a8c8fe3cda16aa1016b12 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Fri, 22 Oct 2021 14:03:23 -0400
Subject: [Bug #18264] Fix memory leak in TracePoint

TracePoint leaks memory because it allocates a `rb_tp_t` struct
without ever freeing it (it is created with `RUBY_TYPED_NEVER_FREE`).
---
 test/ruby/test_settracefunc.rb | 10 ++++++++++
 vm_trace.c                     |  2 +-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/test/ruby/test_settracefunc.rb b/test/ruby/test_settracefunc.rb
index 88488aef5c4..c6955467c47 100644
--- a/test/ruby/test_settracefunc.rb
+++ b/test/ruby/test_settracefunc.rb
@@ -564,6 +564,16 @@ class TestSetTraceFunc < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_settracefunc.rb#L564
     }
   end
 
+  # Bug #18264
+  def test_tracpoint_memory_leak
+    assert_no_memory_leak([], <<-PREP, <<-CODE, rss: true)
+code = proc { TracePoint.new(:line) { } }
+1_000.times(&code)
+PREP
+1_000_000.times(&code)
+CODE
+  end
+
   def trace_by_set_trace_func
     events = []
     trace = nil
diff --git a/vm_trace.c b/vm_trace.c
index b22b2ceb34d..63e4c3ac1a9 100644
--- a/vm_trace.c
+++ b/vm_trace.c
@@ -748,7 +748,7 @@ tp_memsize(const void *ptr) https://github.com/ruby/ruby/blob/trunk/vm_trace.c#L748
 
 static const rb_data_type_t tp_data_type = {
     "tracepoint",
-    {tp_mark, RUBY_TYPED_NEVER_FREE, tp_memsize,},
+    {tp_mark, RUBY_TYPED_DEFAULT_FREE, tp_memsize,},
     0, 0, RUBY_TYPED_FREE_IMMEDIATELY
 };
 
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