Rechecked today on artful:
OVS: 2.8.0-0ubuntu2
Kernel: 4.13.0-16-generic
Based on the cloud image of today, which is post release.

Still crashing with the simple steps to reproduce I listed above:
[   37.370757] IP: add_grec+0x28/0x440
[   37.371002] *pdpt = 000000001dacc001 *pde = 0000000000000000 
[   37.371004] 
[   37.371499] Oops: 0000 [#1] SMP
[   37.371757] Modules linked in: veth openvswitch nf_conntrack_ipv6 
nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_defrag_ipv6 nf_nat 
nf_conntrack libcrc32c 9p fscache kvm_intel ppdev kvm irqbypass 9pnet_virtio 
joydev input_leds serio_raw 9pnet parport_pc parport mac_hid i2c_piix4 
qemu_fw_cfg ip_tables x_tables autofs4 btrfs xor raid6_pq psmouse virtio_blk 
virtio_net pata_acpi floppy
[   37.375047] CPU: 0 PID: 2148 Comm: iperf Tainted: G        W       
4.13.0-16-generic #19-Ubuntu
[   37.375872] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.10.1-1ubuntu1~cloud0 04/01/2014
[   37.376775] task: dd9c3a80 task.stack: ddb1e000
[   37.377206] EIP: add_grec+0x28/0x440
[   37.377548] EFLAGS: 00010202 CPU: 0
[   37.377880] EAX: 00000000 EBX: dd9e8540 ECX: 00000006 EDX: dd9e8540
[   37.378470] ESI: ddacee00 EDI: ddacee00 EBP: db8c5f30 ESP: db8c5ef0
[   37.379063]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[   37.379572] CR0: 80050033 CR2: 00000000 CR3: 1efb1080 CR4: 000006f0
[   37.380167] Call Trace:
[   37.380404]  <SOFTIRQ>
[   37.380632]  mld_ifc_timer_expire+0xfe/0x250
[   37.381037]  ? mld_dad_timer_expire+0x50/0x50
[   37.381451]  call_timer_fn+0x30/0x120
[   37.381800]  ? mld_dad_timer_expire+0x50/0x50
[   37.382214]  ? mld_dad_timer_expire+0x50/0x50
[   37.382627]  run_timer_softirq+0x3c5/0x420
[   37.383015]  ? __softirqentry_text_start+0x8/0x8
[   37.383452]  __do_softirq+0xa9/0x245
[   37.383822]  ? __softirqentry_text_start+0x8/0x8
[   37.384260]  do_softirq_own_stack+0x24/0x30
[   37.384655]  </SOFTIRQ>
[   37.384892]  irq_exit+0xad/0xb0
[   37.385191]  smp_apic_timer_interrupt+0x38/0x50
[   37.385620]  apic_timer_interrupt+0x39/0x40
[   37.386017] EIP: __copy_user_ll+0x3e/0xf0
[   37.386395] EFLAGS: 00010246 CPU: 0
[   37.386726] EAX: b6700b50 EBX: 00000000 ECX: 000013d0 EDX: dd1d0c00
[   37.387315] ESI: dd1d30c0 EDI: b6703010 EBP: ddb1fd34 ESP: ddb1fd28
[   37.387908]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[   37.388417]  ? tcp_rcv_established+0x3b/0x6e0
[   37.388831]  copyout+0x21/0x30
[   37.389123]  copy_page_to_iter+0x1c6/0x3a0
[   37.389512]  skb_copy_datagram_iter+0x133/0x250
[   37.389940]  tcp_recvmsg+0x219/0xb40
[   37.390277]  inet_recvmsg+0x4a/0xc0
[   37.390606]  sock_recvmsg+0x36/0x40
[   37.390934]  SYSC_recvfrom+0xd0/0x150
[   37.391280]  ? set_next_entity+0xb7/0x2c0
[   37.391654]  ? pick_next_task_fair+0x523/0x5d0
[   37.392075]  SyS_socketcall+0x2c6/0x670
[   37.392436]  ? _copy_to_user+0x21/0x30
[   37.392789]  ? put_timespec64+0x34/0x60
[   37.393147]  ? SyS_clock_gettime+0x5b/0xa0
[   37.393530]  do_fast_syscall_32+0x71/0x150
[   37.393915]  entry_SYSENTER_32+0x4e/0x7c
[   37.394280] EIP: 0xb7fb0cf9
[   37.394543] EFLAGS: 00000293 CPU: 0
[   37.394870] EAX: ffffffda EBX: 0000000a ECX: b5efe25c EDX: 00000000
[   37.395448] ESI: b7cf7000 EDI: b6700b30 EBP: b6720b60 ESP: b5efe240
[   37.396033]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[   37.396533] Code: 00 00 00 3e 8d 74 26 00 55 89 e5 57 56 53 89 c6 83 ec 34 
89 4d e8 65 a1 14 00 00 00 89 45 f0 31 c0 8b 42 10 f6 42 48 08 89 45 cc <8b> 00 
c7 45 ec 00 00 00 00 89 45 c8 89 f0 0f 85 b4 02 00 00 8b
[   37.398275] EIP: add_grec+0x28/0x440 SS:ESP: 0068:db8c5ef0
[   37.398783] CR2: 0000000000000000
[   37.399097] ---[ end trace 7e31f16756dddc4e ]---
[   37.399556] Kernel panic - not syncing: Fatal exception in interrupt
[   37.400269] Kernel Offset: 0x14000000 from 0xc1000000 (relocation range: 
0xc0000000-0xdfbfdfff)
[   37.401102] ---[ end Kernel panic - not syncing: Fatal exception in interrupt

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https://bugs.launchpad.net/bugs/1712831

Title:
  4.12.0-11-generic - crashing in infrastructure on i386 openvswitch
  tests

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