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Markus A Kuppe

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Smart Casual Verification of the Confidential Consortium FrameworkNSDI '252025-04-28
Specifies CCF's distributed consensus and client-consistency model in TLA+, instruments the C++ code to emit tiny JSON state traces, and repurposes the TLC…
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Weeks of Debugging Can Save You Hours of TLA+Craft Conference 20232023-05-18
A TLA+ model of a simple webshop reproduces a real-world bug: after about 1800 reads the backend sometimes sees no order because replication lag plus the wrong…
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Turning an Incident Report into a Design Issue with TLA+SREcon23 Americas2023-03-21
A precise TLA+ specification of Cosmos DB behavior reproduces the 28-day outage as a counterexample and shows the root cause is missing session tokens between…
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Workshop: TLA+ in action (Part 1)Hydra 20212021-06-15
Workshop builds a TLA+ specification of Safra’s EWD998 termination detector, iterates from a token-free counter to the token+count version, and exercises the…
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Workshop: TLA+ in action (Part 2)Hydra 20212021-06-15
Workshop models Safra’s EWD998 termination detector in TLA+ using TLC model checking and Lamport’s tutorial style, exercises include reducing Naturals to a…
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Workshop: TLA+ in action (Part 3)Hydra 20212021-06-15
A runnable TLA+ model of Dijkstra/Safra EWD998 appears, modeling node color and per-node counters, a token record with position Q and color, and message…
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Workshop: TLA+ in action (Part 4)Hydra 20212021-06-15
Workshop models EWD998 termination detection in TLA+, writes a low‑level spec that replaces counters with inboxes and a recursive sum, and checks safety and…
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Weeks of Debugging Can Save You Hours of TLA+SREcon20 Americas2020-12-07
A TLA+ spec of a bounded MPMC queue reproduces and explains a surprising deadlock that unit tests miss: TLC finds a violating trace (shortest 9 steps, another…
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