Every clone wakes up confused

Boxd’s VM-forking system creates a byte-identical, already-running child machine in roughly a tenth of a second, but the restored guest initially retains invalid parent-specific state such as its IP address, hostname, random-number pool, clock calibration, and timer setup. Because all virtual CPUs resume halted, the system injects a non-maskable interrupt after placing a validated mailbox in guest memory, allowing a kernel handler to schedule repair work safely in normal execution context. The guest refreshes KVM clock parameters by rewriting an MSR, revives an AMD local APIC timer by rewriting its initial count register, and signals PID 1 so userspace can apply the child’s identity and configuration. Reseeding the kernel entropy pool with host-generated random bytes is prioritized to prevent separately forked children from producing identical tokens, keys, nonces, and UUIDs. Network settings and the hostname are then updated through raw netlink calls rather than cold-starting command-line tools, preserving the system’s sub-200-millisecond performance target while allowing the original workload to resume without observing the migration.

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