pretty good repro

examples/disk-read-file/main.rs

···
     let mut seen_keys: HashMap<Vec<u8>, usize> = HashMap::default();
 
     log::info!("writing stuff...");
-    for i in 0..1_500_000_usize {
+    for i in 0..250_000_usize {
         let k = i.to_be_bytes().to_vec();
-        ks.insert(k.clone(), vec![0xAA; 1024])?;
+        ks.insert(k.clone(), vec![0xAA; 256])?;
         seen_keys.insert(k, i);
     }