Comment 5 for bug 1852432

Verified on Bionic with the following test case:
$ echo 64 | sudo tee /sys/class/net/ens1f0/device/sriov_numvfs && virsh attach-interface valuable-bluefish hostdev 0000:08:02.6 --managed --live

On 4.15.0-72.81, I get the following GPF:
[119044.656412] general protection fault: 0000 [#1] SMP PTI
[119044.656455] Modules linked in: i40evf vfio_pci vfio_virqfd vfio_iommu_type1 vfio vhost_net vhost tap ebtable_filter ebtables devlink ip6t
able_filter ip6_tables kvm_intel binfmt_misc ipt_REJECT nf_reject_ipv4 xt_conntrack ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_CHECKSUM xt_comm
ent xt_tcpudp iptable_mangle iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_filter bridge stp llc dummy
 ixgbevf ipmi_ssif nls_iso8859_1 intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm irqbypass intel_cstate intel_rapl_perf
 lpc_ich hpilo ioatdma shpchp ipmi_si ipmi_devintf ipmi_msghandler mac_hid acpi_power_meter sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core
iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs zstd_compress raid10
[119044.656929] raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear mgag2
00 i2c_algo_bit crct10dif_pclmul crc32_pclmul ttm ghash_clmulni_intel ses pcbc enclosure drm_kms_helper aesni_intel syscopyarea aes_x86_64 cr
ypto_simd sysfillrect glue_helper cryptd sysimgblt ixgbe fb_sys_fops i40e tg3 dca drm nvme ptp hpsa pps_core nvme_core mdio scsi_transport_sa
s wmi [last unloaded: kvm_intel]
[119044.657204] CPU: 11 PID: 10300 Comm: libvirtd Not tainted 4.15.0-72-generic #81-Ubuntu
[119044.657255] Hardware name: HP ProLiant DL360 Gen9, BIOS P89 05/06/2015
[119044.657310] RIP: 0010:i40e_sync_vsi_filters+0x95/0xd00 [i40e]
[119044.657349] RSP: 0018:ffffbcc5479fb718 EFLAGS: 00010202
[119044.657385] RAX: 77b7ed74a738c96d RBX: ffff9aad58382000 RCX: 0000000000000000
[119044.657431] RDX: 0000000000000001 RSI: 00000000fffffe01 RDI: ffff9aad58382000
[119044.657477] RBP: ffffbcc5479fb7b8 R08: 0000000000000000 R09: 0000000000003494
[119044.657523] R10: 0000000000000000 R11: 0000d9714ff8ecd4 R12: ffff9aad58382000
[119044.657569] R13: ffff9aad384662a0 R14: ffff9aad58382a28 R15: ffff9aad67b1643c
[119044.657616] FS: 00007fd7aef27700(0000) GS:ffff9aad7f0c0000(0000) knlGS:0000000000000000
[119044.657668] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[119044.657706] CR2: 00007fd79001c058 CR3: 0000001029f30001 CR4: 00000000001626e0
[119044.657752] Call Trace:
[119044.657778] ? del_timer_sync+0x45/0x50
[119044.657809] ? __next_timer_interrupt+0xe0/0xe0
[119044.657851] i40e_ndo_set_vf_mac+0x109/0x2b0 [i40e]
[119044.657890] do_setlink+0x8a5/0xed0
[119044.657919] ? kmalloc_large_node+0x3b/0x60
[119044.657951] ? security_sock_rcv_skb+0x41/0x60
[119044.657986] rtnl_setlink+0xdc/0x130
[119044.658017] rtnetlink_rcv_msg+0x221/0x2b0
[119044.658049] ? aa_label_sk_perm+0x129/0x140
[119044.658081] ? _cond_resched+0x19/0x40
[119044.658110] ? rtnl_calcit.isra.25+0x110/0x110
[119044.658142] netlink_rcv_skb+0x54/0x130
[119044.658172] rtnetlink_rcv+0x15/0x20
[119044.658198] netlink_unicast+0x19e/0x240
[119044.658227] netlink_sendmsg+0x2d1/0x3d0
[119044.658258] sock_sendmsg+0x3e/0x50
[119044.659986] ___sys_sendmsg+0x2a0/0x2f0
[119044.661666] ? aa_label_sk_perm+0x129/0x140
[119044.663304] ? _raw_spin_unlock_bh+0x1e/0x20
[119044.664914] __sys_sendmsg+0x54/0x90
[119044.666469] ? __sys_sendmsg+0x54/0x90
[119044.668027] SyS_sendmsg+0x12/0x20
[119044.669602] do_syscall_64+0x73/0x130
[119044.671139] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[119044.672643] RIP: 0033:0x7fd7bbcab607
[119044.674095] RSP: 002b:00007fd7aef263d0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e
[119044.675548] RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 00007fd7bbcab607
[119044.676968] RDX: 0000000000000000 RSI: 00007fd7aef26430 RDI: 0000000000000016
[119044.678355] RBP: 00007fd7aef26430 R08: 0000000000000000 R09: 0000000000000000
[119044.679718] R10: 00007fd7aef264bc R11: 0000000000000293 R12: 0000000000000000
[119044.681012] R13: 00007fd7aef26430 R14: 00007fd790012a70 R15: 0000000000000016
[119044.682258] Code: e8 91 38 15 e5 f0 41 0f ba 2c 24 02 72 e8 48 8b 83 40 0f 00 00 c7 45 8c 00 00 00 00 48 89 85 78 ff ff ff 48 8b 03 48 85
 c0 74 17 <8b> 80 30 02 00 00 8b b3 0c 02 00 00 31 c6 89 83 0c 02 00 00 89
[119044.685125] RIP: i40e_sync_vsi_filters+0x95/0xd00 [i40e] RSP: ffffbcc5479fb718
[119044.686379] ---[ end trace f85bde9c06a1d01a ]---

On 4.15.0-73-generic:
$ echo 64 | sudo tee /sys/class/net/ens1f0/device/sriov_numvfs && virsh attach-interface valuable-bluefish hostdev 0000:08:02
.6 --managed --live
64
Interface attached successfully
$ uname -r
4.15.0-73-generic