Network loss on FreeBSD guests under PVE 5.x

[ClayRabbit]

Hello

Since PVE5 is released we are facing an irregular issue with loosing network connection on FreeBSD guests.
Interface is UP, no errors inside logs, but route to gateway just stops working.

After ifconfig em0 down; ifconfig em0 up; all returns to normal.

Issue is never happened with PVE4 or Linux guests.
By default we are using e1000 network driver, but switching to virtio or realtek doesn't help.

I have read bugs.freebsd.org/bugzilla/show_bug.cgi?id=165059 , but not sure it's related to our issue.
I have tried ifconfig em0 -rxcsum -txcsum but it didn't helped either.

Any suggestions?

Thank you.

 

[lhorace]

Did you by any chance turned off TSC hardware offloading and similar parameters?