From: Lee A. Roberts <lee.robe...@hp.com>
Resolve SCTP association hangs observed during SCTP stress
testing. Observable symptoms include communications hangs
with data being held in the association reassembly and/or lobby
(ordering) queues. Close examination of reassembly queue shows
missing packets.
In sctp_ulpq_renege_list(), do not renege packets below the
cumulative TSN ACK point.
Patch applies to linux-3.8 kernel.
Signed-off-by: Lee A. Roberts <lee.robe...@hp.com>
---
net/sctp/ulpqueue.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff -uprN -X linux-3.8-vanilla/Documentation/dontdiff
linux-3.8-SCTP+1/net/sctp/ulpqueue.c linux-3.8-SCTP+2/net/sctp/ulpqueue.c
--- linux-3.8-SCTP+1/net/sctp/ulpqueue.c 2013-02-18 16:58:34.000000000
-0700
+++ linux-3.8-SCTP+2/net/sctp/ulpqueue.c 2013-02-21 07:39:40.888281496
-0700
@@ -969,11 +969,16 @@ static __u16 sctp_ulpq_renege_list(struc
tsnmap = &ulpq->asoc->peer.tsn_map;
- while ((skb = __skb_dequeue_tail(list)) != NULL) {
- freed += skb_headlen(skb);
+ while ((skb = skb_peek_tail(list)) != NULL) {
event = sctp_skb2event(skb);
tsn = event->tsn;
+ /* Don't renege below the Cumulative TSN ACK Point. */
+ if (TSN_lte(tsn, sctp_tsnmap_get_ctsn(tsnmap)))
+ break;
+
+ __skb_unlink(skb, list);
+ freed += skb_headlen(skb);
sctp_ulpevent_free(event);
sctp_tsnmap_renege(tsnmap, tsn);
if (freed >= needed)
--
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