Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Automatic Completion of Distributed Protocols with Symmetry   A distributed protocol is typically modeled as a set of communicating
processes, where each process is described as an extended state machine along
with fairness assumptions, and its correctness is specified using safety and
liveness requirements. Designing correct distributed protocols is a challenging
task. Aimed at simplifying this task, we allow the designer to leave some of
the guards and updates to state variables in the description of extended state
machines as unknown functions. The protocol completion problem then is to find
interpretations for these unknown functions while guaranteeing correctness. In
many distributed protocols, process behaviors are naturally symmetric, and
thus, synthesized expressions are further required to obey symmetry
constraints. Our counterexample-guided synthesis algorithm consists of
repeatedly invoking two phases. In the first phase, candidates for unknown
expressions are generated using the SMT solver Z3. This phase requires
carefully orchestrating constraints to enforce the desired symmetry in
read/write accesses. In the second phase, the resulting completed protocol is
checked for correctness using a custom-built model checker that handles
fairness assumptions, safety and liveness requirements, and exploits symmetry.
When model checking fails, our tool examines a set of counterexamples to
safety/liveness properties to generate constraints on unknown functions that
must be satisfied by subsequent completions. For evaluation, we show that our
prototype is able to automatically discover interesting missing details in
distributed protocols for mutual exclusion, self stabilization, and cache
coherence.

26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin