On Mon, Dec 04, 2017 at 09:00:56AM -0800, Gregory Rose wrote: > On 11/18/2017 2:01 AM, w00273186 wrote: > >From: Yunjian Wang <[email protected]> > > > >The variable tun_dst in struct ovs_gso_cb isn't necessarily all-zeros which > >came from the Netlink layer. When delete a netdev port and immediately add > >a vxlan port, they maybe use the same port_no. So the variable tun_dst of > >struct ovs_gso_cb hasn't be set, when the skb sent to the vxlan port. And > >the panic will be triggered. > > > > BUG: unable to handle kernel NULL pointer dereference at > > 0000000000000052 > > IP: [<ffffffffa07954f4>] rpl_vxlan_xmit+0x34/0x60 [openvswitch] > > PGD 1f9f374067 PUD 1f9f375067 PMD 0 > > Oops: 0000 [#1] SMP > > RIP: 0010:[<ffffffffa07954f4>] [<ffffffffa07954f4>] > > rpl_vxlan_xmit+0x34/0x60 [openvswitch] > > RSP: 0018:ffff881fff483898 EFLAGS: 00010202 > > RAX: 0000000000000040 RBX: ffff881ff2d59f00 RCX: ffff881f742016b0 > > RDX: 0000000000000001 RSI: ffff881f9f5f0000 RDI: ffff881ff2d59f00 > > RBP: ffff881fff483898 R08: 000000000000002e R09: 0000000000000000 > > R10: 0000000000000000 R11: ffff881fff483a50 R12: ffff881f74201680 > > R13: 000000000000ffbe R14: 0000000000000000 R15: ffff881ff2d59f00 > > FS: 00007f8b6f7fe700(0000) GS:ffff881fff480000(0000) > > knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 0000000000000052 CR3: 0000001f9f373000 CR4: 00000000000027e0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > > Call Trace: > > <IRQ> > > [<ffffffffa0786480>] ovs_vport_send+0xa0/0x180 [openvswitch] > > [<ffffffffa077414e>] do_output+0x4e/0xf0 [openvswitch] > > [<ffffffffa07758ae>] do_execute_actions+0xa6e/0xa90 [openvswitch] > > [<ffffffff815b654f>] ? netlink_unicast+0x16f/0x1b0 > > [<ffffffff815732bb>] ? skb_zerocopy+0x1fb/0x380 > > [<ffffffffa07847ca>] ? flow_lookup.isra.8+0x4a/0xc0 [openvswitch] > > [<ffffffffa0775b2d>] ovs_execute_actions+0x4d/0x140 [openvswitch] > > [<ffffffffa077c604>] ovs_dp_process_packet+0x94/0x140 [openvswitch] > > [<ffffffffa07762c4>] ? ovs_ct_update_key+0xc4/0x150 [openvswitch] > > [<ffffffffa078637b>] ovs_vport_receive+0x7b/0xe0 [openvswitch] > > [<ffffffffa077c604>] ? ovs_dp_process_packet+0x94/0x140 [openvswitch] > > [<ffffffff816062d6>] ? __fib_validate_source.isra.13+0x2b6/0x400 > > [<ffffffff8158da15>] ? dst_init+0xe5/0xf0 > > [<ffffffffa021a2af>] ? generic_packet+0x1f/0x30 [nf_conntrack] > > [<ffffffffa02160d0>] ? nf_conntrack_in+0x350/0x5f0 [nf_conntrack] > > [<ffffffffa0787047>] netdev_port_receive+0xa7/0x100 [openvswitch] > > [<ffffffffa07870be>] netdev_frame_hook+0x1e/0x30 [openvswitch] > > [<ffffffff81581a52>] __netif_receive_skb_core+0x1e2/0x800 > > [<ffffffff81582088>] __netif_receive_skb+0x18/0x60 > > [<ffffffff81582110>] netif_receive_skb_internal+0x40/0xc0 > > [<ffffffff81583228>] napi_gro_receive+0xd8/0x130 > > [<ffffffffa04ef634>] ixgbe_clean_rx_irq+0x7c4/0xa60 [ixgbe] > > [<ffffffffa04f0930>] ixgbe_poll+0x2e0/0x6c0 [ixgbe] > > [<ffffffff815828b0>] net_rx_action+0x170/0x380 > > [<ffffffff81090b0f>] __do_softirq+0xef/0x280 > > [<ffffffff816ac15c>] call_softirq+0x1c/0x30 > > [<ffffffff8102e47d>] do_softirq+0x5d/0xb0 > > [<ffffffff81090ebd>] irq_exit+0x12d/0x140 > > [<ffffffff816accf8>] do_IRQ+0x58/0xf0 > > [<ffffffff816a1ced>] common_interrupt+0x6d/0x6d > > <EOI> > > > >Signed-off-by: Yunjian Wang <[email protected]> > >--- > > datapath/linux/compat/gso.h | 7 ++++++- > > 1 file changed, 6 insertions(+), 1 deletion(-) > > > >diff --git a/datapath/linux/compat/gso.h b/datapath/linux/compat/gso.h > >index 2e9dbb3..2010940 100644 > >--- a/datapath/linux/compat/gso.h > >+++ b/datapath/linux/compat/gso.h > >@@ -34,11 +34,16 @@ struct ovs_gso_cb { > > static inline void skb_clear_ovs_gso_cb(struct sk_buff *skb) > > { > > OVS_GSO_CB(skb)->fix_segment = NULL; > >+#ifndef USE_UPSTREAM_TUNNEL > >+ OVS_GSO_CB(skb)->tun_dst = NULL; > >+#endif > > } > > #else > > static inline void skb_clear_ovs_gso_cb(struct sk_buff *skb) > > { > >- > >+#ifndef USE_UPSTREAM_TUNNEL > >+ OVS_GSO_CB(skb)->tun_dst = NULL; > >+#endif > > } > > #endif > > I think this is the right thing to do and it passes compile and check-kmod > tests on both Ubuntu 16 and RHEL 7 hosts. > > Tested-by: Greg Rose <[email protected]> > Reviewed-by: Greg Rose <[email protected]>
Thanks, applied to master. Let me know if I should backport this (and how far). _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
