kernel 5.0.0-21-generic fixes the issue. Thanks for your help!

** Tags removed: disco verification-needed-disco
** Tags added: verification-done-disco

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https://bugs.launchpad.net/bugs/1829652

Title:
  Kernel panic upon resetting ixgbe SR-IOV VFIO virtual function using
  5.0 kernel

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Disco:
  Fix Committed
Status in linux source package in Eoan:
  In Progress

Bug description:
  [Impact]
  If you pass a vf of an intel 10G nic - such as the X550T - into a VM, and 
that nic does not support IPsec, the system will oops.

  [Test Case]
  Enable virtual functions (e.g. (class/net/em1/device/sriov_numvfs = 4).

  Use an XML snippet to delegate virtual function to VM, e.g.:

      <hostdev mode='subsystem' type='pci' managed='yes'>
        <driver name='vfio'/>
        <source>
          <address domain='0x0000' bus='0x05' slot='0x10' function='0x0'/>
        </source>
        <alias name='hostdev0'/>
        <address type='pci' domain='0x0000' bus='0x03' slot='0x00' 
function='0x0'/>
      </hostdev>

  Start VM.

  [Fix]
  
https://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue.git/commit/?h=dev-queue&id=a2243a4faae5a3c210995ade2cbca369b20daa0f

  [Regression Risk]
  Restricted to the ixgbe driver.

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