Hi,
could you outline what exactly you do to "attach Vf's manually"?
Do you use libvirt`s `virsh attach-device` and if so which config do you use 
for the device?

Furthermore "I can see VM is crashed/shutdown" what exactly is it.
Is there crash file in /var/crash for a real crash?
What is in /var/log/libvirt/qemu/<guestname>.log when this happens?

I see the memlock limit, did you have anything further in dmesg around
apparmor, maybe DENIES to raise that limit (was an issue that existed in
the past)?

Which kind of VF are you using exactly HW model and type and the way you
split it into VFs?

And finally which Ubuntu release are you on so that one can consider the
right SW versions?

** Changed in: libvirt (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1854952

Title:
  VM is getting crashed/shutdown when we attach VF's on demand

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