I can reproduce the issue in Azure with Ubuntu 18.04 and the kernel
linux-azure-edge 4.18.0.1004.5 from bionic-proposed.

I use an instance of type "Standard F4s_v2 (4 vcpus, 8 GB memory)"

I launch the instance and get the 4.15.0-1030-azure kernel:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:        18.04
Codename:       bionic

$ uname -a
Linux davecore-an 4.15.0-1030-azure #31-Ubuntu SMP Tue Oct 30 18:35:53 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux

$ dmesg | grep -i mella
[   27.398120] mlx4_core: Mellanox ConnectX core driver v4.0-0
[   27.425228] <mlx4_ib> mlx4_ib_add: mlx4_ib: Mellanox ConnectX InfiniBand 
driver v4.0-0
[   27.658916] mlx4_en: Mellanox ConnectX HCA Ethernet driver v4.0-0

$ dpkg -l | grep linux-azure
ii  linux-azure                         4.15.0.1030.30                          
    amd64        Complete Linux kernel for Azure systems.
ii  linux-azure-cloud-tools-4.15.0-1030 4.15.0-1030.31                          
    amd64        Linux kernel version specific cloud tools for version 
4.15.0-1030
ii  linux-azure-headers-4.15.0-1030     4.15.0-1030.31                          
    all          Header files related to Linux kernel version 4.15.0
ii  linux-azure-tools-4.15.0-1030       4.15.0-1030.31                          
    amd64        Linux kernel version specific tools for version 4.15.0-1030

$ lsmod  | grep -i mlx
mlx4_en               114688  0

$ lspci
0000:00:00.0 Host bridge: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX Host 
bridge (AGP disabled) (rev 03)
0000:00:07.0 ISA bridge: Intel Corporation 82371AB/EB/MB PIIX4 ISA (rev 01)
0000:00:07.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01)
0000:00:07.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 02)
0000:00:08.0 VGA compatible controller: Microsoft Corporation Hyper-V virtual 
VGA
0001:00:02.0 Ethernet controller: Mellanox Technologies MT27500/MT27520 Family 
[ConnectX-3/ConnectX-3 Pro Virtual Function]

I then enable bionic-proposed and install the linux-azure-edge kernel
and reboot. I can't see the Mellanox device anymore:

$ dmesg | grep -i mella

$ uname -a
Linux davecore-an 4.18.0-1004-azure #4~18.04.1-Ubuntu SMP Thu Oct 25 14:25:41 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

$ dpkg -l | grep linux-azure
ii  linux-azure                              4.15.0.1030.30                     
         amd64        Complete Linux kernel for Azure systems.
ii  linux-azure-cloud-tools-4.15.0-1030      4.15.0-1030.31                     
         amd64        Linux kernel version specific cloud tools for version 
4.15.0-1030
ii  linux-azure-edge                         4.18.0.1004.5                      
         amd64        Complete Linux kernel for Azure systems.
ii  linux-azure-edge-cloud-tools-4.18.0-1004 4.18.0-1004.4~18.04.1              
         amd64        Linux kernel version specific cloud tools for version 
4.18.0-1004
ii  linux-azure-edge-tools-4.18.0-1004       4.18.0-1004.4~18.04.1              
         amd64        Linux kernel version specific tools for version 
4.18.0-1004
ii  linux-azure-headers-4.15.0-1030          4.15.0-1030.31                     
         all          Header files related to Linux kernel version 4.15.0
ii  linux-azure-headers-4.18.0-1004          4.18.0-1004.4~18.04.1              
         all          Header files related to Linux kernel version 4.18.0
ii  linux-azure-tools-4.15.0-1030            4.15.0-1030.31                     
         amd64        Linux kernel version specific tools for version 
4.15.0-1030

$ lspci
00:00.0 Host bridge: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX Host bridge 
(AGP disabled) (rev 03)
00:07.0 ISA bridge: Intel Corporation 82371AB/EB/MB PIIX4 ISA (rev 01)
00:07.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01)
00:07.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 02)
00:08.0 VGA compatible controller: Microsoft Corporation Hyper-V virtual VGA

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https://bugs.launchpad.net/bugs/1794477

Title:
  Accelerated networking (SR-IOV VF) broken in 18.10 daily

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