I just now reimaged cloudvirt1025. The reimage went OK, I launched a canary VM on it and I can ssh to the VM (it is canary1025-01.cloudvirt-canary.eqiad1.wikimedia.cloud).
That was a couple of hours ago. NOW I can't ssh to the host or ping it from cumin1001. Everything looks fine on the console, and I can still ssh to the canary VM.
Icinga also can't reach the host, which is noisy.