From 7951d3d83c3c74e12ffab65cc638f21e394feb06 Mon Sep 17 00:00:00 2001
From: SuhasSrinivasan <32346517+SuhasSrinivasan@users.noreply.github.com>
Date: Wed, 5 Aug 2026 00:58:05 -0700
Subject: [PATCH 1/2] Remove stray adjust-mods debug output

---
 modkit-core/src/modbam_util/subcommands.rs |  1 -
 modkit/tests/test_adjust_mods.rs           | 25 ++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/modkit-core/src/modbam_util/subcommands.rs b/modkit-core/src/modbam_util/subcommands.rs
index 509b270b..6a84dfc4 100644
--- a/modkit-core/src/modbam_util/subcommands.rs
+++ b/modkit-core/src/modbam_util/subcommands.rs
@@ -776,7 +776,6 @@ impl Adjust {
             .map(|raw| parse_edge_filter_input(raw, self.invert_edge_filter))
             .transpose()?;
 
-        dbg!(&self.cpg);
         let motifs = parse_forward_motifs(&self.motif, self.cpg)?;
         if let Some(ms) = motifs.as_ref() {
             let patterns = ms.iter().map(|x| x.as_str()).join(",");
diff --git a/modkit/tests/test_adjust_mods.rs b/modkit/tests/test_adjust_mods.rs
index 76ae5962..bf58b5c1 100644
--- a/modkit/tests/test_adjust_mods.rs
+++ b/modkit/tests/test_adjust_mods.rs
@@ -5,6 +5,8 @@ use mod_kit::mod_bam::RawModTags;
 use mod_kit::mod_base_code::{BaseState, DnaBase};
 use rust_htslib::{bam, bam::Read};
 use std::path::PathBuf;
+use std::process::Command;
+use tempfile::tempdir;
 
 mod common;
 
@@ -14,6 +16,29 @@ fn test_help() {
     let _out = run_modkit(&pileup_help_args).unwrap();
 }
 
+#[test]
+fn test_adjust_mods_does_not_dump_cpg_to_stderr() {
+    let temp_dir = tempdir().unwrap();
+    let output_bam = temp_dir.path().join("adjusted.bam");
+    let output = Command::new(env!("CARGO_BIN_EXE_modkit"))
+        .args([
+            "adjust-mods",
+            "--ignore",
+            "h",
+            "../tests/resources/bc_anchored_10_reads.sorted.bam",
+            output_bam.to_str().unwrap(),
+        ])
+        .output()
+        .unwrap();
+    let stderr = String::from_utf8_lossy(&output.stderr);
+
+    assert!(output.status.success(), "adjust-mods failed: {stderr}");
+    let mut reader = bam::Reader::from_path(&output_bam).unwrap();
+    assert!(reader.records().next().is_some(), "expected adjusted records");
+    assert!(!stderr.contains("&self.cpg = false"), "{stderr}");
+    assert!(!stderr.contains("modbam_util/subcommands.rs"), "{stderr}");
+}
+
 fn tests_adjust_output(
     input_path: &str,
     output_path: &str,

From 8eb4867b309a3f0eac4317d16652780ea3cec506 Mon Sep 17 00:00:00 2001
From: SuhasSrinivasan <32346517+SuhasSrinivasan@users.noreply.github.com>
Date: Wed, 5 Aug 2026 00:58:21 -0700
Subject: [PATCH 2/2] Prevent interval endpoint overflow

---
 modkit-core/src/interval_chunks.rs | 67 +++++++++++++++++++++++++++++-
 1 file changed, 65 insertions(+), 2 deletions(-)

diff --git a/modkit-core/src/interval_chunks.rs b/modkit-core/src/interval_chunks.rs
index a6aa5541..2cfdd1a9 100644
--- a/modkit-core/src/interval_chunks.rs
+++ b/modkit-core/src/interval_chunks.rs
@@ -271,7 +271,7 @@ impl ReferenceIntervalBatchesFeeder {
             // in the case where we're on a large chrom end will be < length,
             // but batch length will be equal to interval size
             let end = std::cmp::min(
-                start + self.interval_size,
+                start.saturating_add(self.interval_size),
                 self.curr_contig.end(),
             );
             // get the sequence here.
@@ -660,8 +660,11 @@ where
 mod interval_chunks_tests {
     use rust_htslib::faidx;
 
-    use crate::interval_chunks::slice_dna_sequence;
+    use crate::interval_chunks::{
+        slice_dna_sequence, ReferenceIntervalBatchesFeeder,
+    };
     use crate::test_utils::load_test_sequence;
+    use crate::util::ReferenceRecord;
 
     #[test]
     fn test_check_sequence_slicing_is_same_as_fetch() {
@@ -697,4 +700,64 @@ mod interval_chunks_tests {
         // let (s, e) = (s as usize, e as usize);
         // assert_eq!(&seq[s..e], ['E', 'F']);
     }
+
+    #[test]
+    fn test_reference_interval_batches_near_u32_max() {
+        let requested_start = u32::MAX - 9;
+        let requested_end = u32::MAX;
+        let record = ReferenceRecord::new(
+            7,
+            requested_start,
+            requested_end - requested_start,
+            "near-u32-max".to_string(),
+        );
+        let mut feeder = ReferenceIntervalBatchesFeeder::new(
+            vec![record],
+            1,
+            8,
+            false,
+            None,
+            None,
+        )
+        .unwrap();
+        let mut intervals = Vec::new();
+        let mut terminated = false;
+
+        for _ in 0..4 {
+            match feeder.next() {
+                Some(Ok(batches)) => intervals.extend(
+                    batches.into_iter().flat_map(|batch| batch.0).map(
+                        |coordinates| {
+                            (coordinates.start_pos, coordinates.end_pos)
+                        },
+                    ),
+                ),
+                Some(Err(error)) => panic!("feeder failed: {error}"),
+                None => {
+                    terminated = true;
+                    break;
+                }
+            }
+        }
+
+        assert!(terminated, "feeder did not terminate");
+        assert_eq!(
+            intervals,
+            vec![
+                (requested_start, u32::MAX - 1),
+                (u32::MAX - 1, requested_end),
+            ]
+        );
+        let mut cursor = requested_start;
+        let mut covered = 0u64;
+        for (start, end) in intervals {
+            assert_eq!(start, cursor, "intervals must be monotonic");
+            assert!(start < end, "intervals must be nonempty");
+            assert!(end <= requested_end, "interval exceeds contig end");
+            covered += u64::from(end - start);
+            cursor = end;
+        }
+        assert_eq!(cursor, requested_end);
+        assert_eq!(covered, u64::from(requested_end - requested_start));
+    }
 }