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Josh Siviour
5cf5cba7ac
The LB system microVM stripped its module tree to virtio + fw_cfg +
failover, but init.sh only loaded qemu_fw_cfg and virtio_net. virtio_net
depends on net_failover -> failover; modprobe resolves that chain via
modules.dep, and load_mod()'s insmod-by-path fallback loads a single .ko
with no dependency resolution.
When the image is built on a kmod-less host (depmod skipped, no
modules.dep) the chain can't be resolved either way, so virtio_net fails
to load, no NIC appears ('no interface found for MAC'), the lb-agent has
no network, heartbeats never reach AWSGW and every LB hangs in
provisioning until the 5m e2e timeout. Baremetal runners ship kmod so
modules.dep is generated and the chain resolves — which is why the LB
suite passed there but failed on normal CI.
Load failover -> net_failover -> virtio_net explicitly bottom-up so the
NIC comes up regardless of whether modules.dep exists.