core/rawdb: fix double-lock causing hang (ethereum#24189)

Fixes ethereum#24159

Co-authored-by: Felix Lange <fjl@twurst.com>

core/rawdb/accessors_chain.go

@@ -447,8 +447,11 @@ func ReadCanonicalBodyRLP(db ethdb.Reader, number uint64) rlp.RawValue {
 		if len(data) > 0 {
 			return nil
 		}
-		// Get it by hash from leveldb
-		data, _ = db.Get(blockBodyKey(number, ReadCanonicalHash(db, number)))
+		// Block is not in ancients, read from leveldb by hash and number.
+		// Note: ReadCanonicalHash cannot be used here because it also
+		// calls ReadAncients internally.
+		hash, _ := db.Get(headerHashKey(number))
+		data, _ = db.Get(blockBodyKey(number, common.BytesToHash(hash)))
 		return nil
 	})
 	return data