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[Bug 1262692] Re: oops using openvswitch 1.4.6 with 3.5 series kernel


Ok so the problem is that Linux changed the prototype of
ip_select_indent. We can fix this on the ovs side using the following:

diff --git a/datapath/tunnel.c b/datapath/tunnel.c
index 1ebbc77..d62e1ea 100644
--- a/datapath/tunnel.c
+++ b/datapath/tunnel.c
@@ -1294,8 +1294,14 @@ int ovs_tnl_send(struct vport *vport, struct sk_buff *skb)
                iph->tos = tos;
                iph->ttl = ttl;
                iph->frag_off = frag_off;
-               ip_select_ident(iph, &rt_dst(rt), NULL);
+               /* linux commit 703133de changes the interface of
+                  ip_select_ident from iph to skb */
+               ip_select_ident(skb, &rt_dst(rt), NULL);
+               ip_select_ident(iph, &rt_dst(rt), NULL);
                skb = tnl_vport->tnl_ops->update_header(vport, mutable,
                                                        &rt_dst(rt), skb);
                if (unlikely(!skb))

So we just need to check if the kernel version has this header and switch accordingly. The version I have above isn't exactly correct since there are differences between linux upstream and stable.

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  oops using openvswitch 1.4.6 with 3.5 series kernel

Status in “linux” package in Ubuntu:
  In Progress
Status in “openvswitch” package in Ubuntu:
  In Progress

Bug description:
  1) This affects Precise w/ 3.5 HWE kernel and Quantal series.
  This is using the openvswitch 1.4.6 package currently in proposed.

  ii openvswitch-common 1.4.6-0ubuntu1.12.10.1 amd64 Open vSwitch common components
  ii openvswitch-datapath-dkms 1.4.6-0ubuntu1.12.10.1 all Open vSwitch datapath module source - DKMS version
  ii openvswitch-switch 1.4.6-0ubuntu1.12.10.1 amd64 Open vSwitch switch implementations
  ii openvswitch-test 1.4.6-0ubuntu1.12.10.1 all Open vSwitch test package

  Expected that setting up a GRE tunnel won't cause an oops.

  Test Case:
  # Install above packages with affected versions.
  # Ensure you have an isolated network setup for eth1 between vms
  # Obviously replace IPs with what's appropriate on your network
  ovs-vsctl del-br integbr
  ovs-vsctl add-br integbr
  ifconfig eth1 netmask
  ovs-vsctl add-port integbr gre0 -- set interface gre0 type=gre options:remote_ip=
  ovs-vsctl add-port integbr tsp0 -- set interface tsp0 type=internal
  ifconfig tsp0 netmask
  iptables -F
  iptables -F -t nat
  # goes boom here

  This is the bt from crash:

  PID: 1197   TASK: ffff88007a009700  CPU: 0   COMMAND: "ovs-vswitchd"
   #0 [ffff8800799213f0] machine_kexec at ffffffff8103a275
   #1 [ffff880079921460] crash_kexec at ffffffff810b9d68
   #2 [ffff880079921530] oops_end at ffffffff81685600
   #3 [ffff880079921560] no_context at ffffffff81676637
   #4 [ffff8800799215c0] __bad_area_nosemaphore at ffffffff81676822
   #5 [ffff880079921610] bad_area_nosemaphore at ffffffff81676854
   #6 [ffff880079921620] do_page_fault at ffffffff816881bb
   #7 [ffff880079921730] do_async_page_fault at ffffffff81687a35
   #8 [ffff880079921750] async_page_fault at ffffffff81684a95
   #9 [ffff8800799218b0] ovs_vport_send at ffffffffa01b956e [openvswitch]
  #10 [ffff8800799218d0] do_output at ffffffffa01b0214 [openvswitch]
  #11 [ffff8800799218e0] do_execute_actions at ffffffffa01b031f [openvswitch]
  #12 [ffff880079921970] ovs_execute_actions at ffffffffa01b0a68 [openvswitch]
  #13 [ffff8800799219b0] ovs_packet_cmd_execute at ffffffffa01b1279 [openvswitch]
  #14 [ffff880079921a10] genl_rcv_msg at ffffffff8159c9b0
  #15 [ffff880079921aa0] netlink_rcv_skb at ffffffff8159c2d1
  #16 [ffff880079921ad0] genl_rcv at ffffffff8159c745
  #17 [ffff880079921af0] netlink_unicast at ffffffff8159bc2d
  #18 [ffff880079921b40] netlink_sendmsg at ffffffff8159bf8a
  #19 [ffff880079921bd0] sock_sendmsg at ffffffff8155c838
  #20 [ffff880079921d50] ___sys_sendmsg at ffffffff8155cc81
  #21 [ffff880079921f00] __sys_sendmsg at ffffffff8155ea09
  #22 [ffff880079921f70] sys_sendmsg at ffffffff8155ea62
  #23 [ffff880079921f80] system_call_fastpath at ffffffff8168c5a9
      RIP: 00007f4b2bfee570  RSP: 00007fff3cfd08e8  RFLAGS: 00000206
      RAX: 000000000000002e  RBX: ffffffff8168c5a9  RCX: ffffffffffffffff
      RDX: 0000000000000000  RSI: 00007fff3cfcd910  RDI: 0000000000000025
      RBP: 00007f4b2f2a9e40   R8: 00007f4b2f2ab2c0   R9: 00000000000002ff
      R10: 1600000000000000  R11: 0000000000000246  R12: ffffffff8155ea62
      R13: ffff880079921f78  R14: 00007fff3cfcd910  R15: 0000000000000002
      ORIG_RAX: 000000000000002e  CS: 0033  SS: 002b

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