diff --git a/traffic_core/src/swap.rs b/traffic_core/src/swap.rs
index fe6fd5a..c8edfa7 100644
--- a/traffic_core/src/swap.rs
+++ b/traffic_core/src/swap.rs
@@ -339,7 +339,7 @@ fn render_fstab_line(path: &Path, priority: i32) -> String {
 fn enable_desired_swap(desired: &DesiredSwap) -> anyhow::Result<()> {
     let active = read_active_swaps()?;
     if let Some(found) = active.iter().find(|v| v.name == desired.path)
-        && found.size_bytes == desired.size_bytes
+        && active_swap_size_matches(found.size_bytes, desired.size_bytes)
         && found.priority == desired.priority
     {
         return Ok(());
@@ -553,8 +553,11 @@ mod tests {
 
     #[test]
     fn active_swap_size_accepts_mkswap_usable_size_delta() {
+        // Debian 13: swapon may report 4096 bytes less than file size.
         assert!(active_swap_size_matches(2147479552, 2147483648));
+        assert!(active_swap_size_matches(2147483648, 2147483648));
         assert!(!active_swap_size_matches(2146435072, 2147483648));
+        assert!(!active_swap_size_matches(2147487744, 2147483648));
     }
 
     #[test]
diff --git a/traffic_core/src/traffic.rs b/traffic_core/src/traffic.rs
index 6c9c168..43c94da 100644
--- a/traffic_core/src/traffic.rs
+++ b/traffic_core/src/traffic.rs
@@ -600,6 +600,7 @@ fn is_not_found_error(stderr_or_msg: &str) -> bool {
         || s.contains("cannot find device")
         || s.contains("no such device")
         || s.contains("no such file")
+        || s.contains("handle of zero")
 }
 
 fn parse_root_class_rate_ceil(raw: &str, class_id: &str) -> Option<ClassRateCeil> {
@@ -953,6 +954,7 @@ fn run_allow_notfound(transport: &dyn NsTransport, args: &[&str]) -> anyhow::Res
                 || msg.contains("cannot find device")
                 || msg.contains("no such device")
                 || msg.contains("does not exist")
+                || msg.contains("handle of zero")
             {
                 return Ok(());
             }
@@ -1115,6 +1117,9 @@ mod tests {
         assert!(is_not_found_error("RTNETLINK answers: No such device"));
         assert!(is_not_found_error("Cannot find device \"ifb0\""));
         assert!(is_not_found_error("does not exist"));
+        assert!(is_not_found_error(
+            "Cannot delete qdisc with handle of zero"
+        ));
         assert!(!is_not_found_error("permission denied"));
     }