Update notes.txt

Author: johnousterhout

notes.txt

@@ -1,6 +1,10 @@
 Notes for Homa implementation in Linux:
 ---------------------------------------
 
+* Bug with homa_qdisc: if a TSO packet gets segmented in software, the
+  homa_skb_info is not replicated in the segments, which causes crashes
+  (e.g., homq_qdisc_defer_homa ends up with a NULL value for rpc).
+
 * (12/12/25) Something is wrong with the xl170 cluster: both Homa and TCP
   are showing considerably worse performance than previously. I tried multiple
   different clusters, and tried backing out to older versions of Homa and