TEST 064

TEST-064

Stimulus

Concurrent operations under two names for the same UUID, different UUIDs, and an unsafe lock; if Linux flock is considered, duplicated or inherited descriptors across coordinator exit and retained or closed descriptors during exec

Required observation

Same-VM mutations serialize; different VMs can proceed; lock failure does not fall back to unlocked mutation. A retained descriptor can keep a flock lock held; lock release or reacquisition alone does not prove an earlier VirtualBox operation stopped. Descriptor cases are conditional on the lock mechanism selected.