Dear Alexey,
seems to help. Thank you for your quick response. Kernel 3.10.28 is now stable using h323 / Polycom.
Will test this patch with different kernel versions the next days.
Best Regards,
Toni
Original message from Alexey Dobriyan:
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Date Fri, 31 Jan 2014 16:29:58 +0300
Subject Re: OOPS in nf_ct_unlink_expect_report using Polycom RealPresence Mobile
From Alexey Dobriyan <>
Disabling nf_nat_h323 and nf_conntrack_h323 avoids crash -
but video conferencing software is no more usable.
BUG: unable to handle kernel paging request at 00100104
IP: [<f8214f07>] nf_ct_unlink_expect_report
This must be the same bug fixed in SIP module:
commit 3f509c689a07a4aa989b426893d8491a7ffcc410
netfilter: nf_nat_sip: fix incorrect handling of EBUSY for RTCP expectation
Try attached patch (if this is mangled):
--- a/net/ipv4/netfilter/nf_nat_h323.c
+++ b/net/ipv4/netfilter/nf_nat_h323.c
@@ -229,7 +229,10 @@ static int nat_rtp_rtcp(struct sk_buff *skb,
struct nf_conn *ct,
ret = nf_ct_expect_related(rtcp_exp);
if (ret == 0)
break;
- else if (ret != -EBUSY) {
+ else if (ret == -EBUSY) {
+ nf_ct_unexpect_related(rtp_exp);
+ continue;
+ } else if (ret < 0) {
nf_ct_unexpect_related(rtp_exp);
nated_port = 0;
break;--- a/net/ipv4/netfilter/nf_nat_h323.c+++ b/net/ipv4/netfilter/nf_nat_h323.c
@@ -229,7 +229,10 @@ static int nat_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
ret = nf_ct_expect_related(rtcp_exp);
if (ret == 0)
break;
- else if (ret != -EBUSY) {
+ else if (ret == -EBUSY) {
+ nf_ct_unexpect_related(rtp_exp);
+ continue;
+ } else if (ret < 0) {
nf_ct_unexpect_related(rtp_exp);
nated_port = 0;
break;