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a40503e44b
QEMU's process monitor calls stop() by itself when the process dies, so an API stop and a process-death stop run concurrently in the normal case — and the datapath release sat outside _execute_lock, letting both stops sweep the adapter TAP map at the same time. Whichever finished first cleared _kernel_taps under the other's iterator, which died with "dictionary changed size during iteration" (the monitor's task, so it surfaced as "Task exception was never retrieved") with the rest of its sweep, the orphan-bridge removal and uBridge's shutdown skipped. Keep the previous fix's ordering (process side first, then the devices) and hold the lock across the release: serialized, the second stop finds uBridge gone and sweeps nothing. Reproduced deterministically with two concurrent stop() calls, the first parked mid-sweep — it raised at qemu_vm.py:1659 before the change, and every TAP is swept exactly once after it.