https://git.ruby-lang.org/ruby.git/commit/?id=dde69ab5c6

From dde69ab5c63a01c20c9bc19b7a11d9c64f6dab2a Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@s...>
Date: Tue, 19 Jan 2021 14:17:51 -0500
Subject: Fix ujit block hash table bug

---
 ujit_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ujit_core.c b/ujit_core.c
index 3211643f80..6f51440b86 100644
--- a/ujit_core.c
+++ b/ujit_core.c
@@ -115,6 +115,7 @@ block_t* gen_block_version(blockid_t blockid, const ctx_t* start_ctx) https://github.com/ruby/ruby/blob/trunk/ujit_core.c#L115
 
     // Keep track of the new block version
     st_insert(version_tbl, (st_data_t)&block->blockid, (st_data_t)block);
+    RUBY_ASSERT(find_block_version(blockid, start_ctx) != NULL);
 
     // For each successor block to compile
     for (;;) {
@@ -482,7 +483,7 @@ int blockid_cmp(st_data_t arg0, st_data_t arg1) https://github.com/ruby/ruby/blob/trunk/ujit_core.c#L483
 {
     const blockid_t *block0 = (const blockid_t*)arg0;
     const blockid_t *block1 = (const blockid_t*)arg1;
-    return (block0->iseq == block1->iseq) && (block0->idx == block1->idx);
+    return (block0->iseq != block1->iseq) || (block0->idx != block1->idx);
 }
 
 st_index_t blockid_hash(st_data_t arg)
-- 
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