/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:12:25,227 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 17:12:25,230 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 17:12:25,276 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 17:12:25,276 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 17:12:25,277 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 17:12:25,278 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 17:12:25,280 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 17:12:25,282 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 17:12:25,283 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 17:12:25,283 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 17:12:25,285 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 17:12:25,285 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:12:25,286 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:12:25,287 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:12:25,288 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:12:25,289 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:12:25,290 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:12:25,291 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:12:25,293 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:12:25,295 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:12:25,296 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:12:25,297 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:12:25,298 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:12:25,301 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 17:12:25,308 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:12:25,309 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:12:25,310 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:12:25,311 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 17:12:25,332 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:12:25,333 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:12:25,334 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:12:25,334 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:12:25,334 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:12:25,335 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:12:25,335 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:12:25,335 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:12:25,335 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:12:25,335 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:12:25,335 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:12:25,336 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:12:25,336 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:12:25,336 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:12:25,336 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:12:25,336 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:12:25,337 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:12:25,337 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:12:25,337 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:12:25,337 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:12:25,337 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:12:25,338 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:12:25,338 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:12:25,338 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:12:25,338 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:12:25,338 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:12:25,339 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:12:25,339 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:12:25,339 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:12:25,339 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; [2020-08-18 17:12:25,638 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:12:25,651 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:12:25,654 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:12:25,656 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:12:25,656 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:12:25,657 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-18 17:12:25,740 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7ba575da3/d9336a143bc54a52b7eb9930d5ae9d64/FLAG974a0416f [2020-08-18 17:12:26,192 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:12:26,194 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-18 17:12:26,200 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7ba575da3/d9336a143bc54a52b7eb9930d5ae9d64/FLAG974a0416f [2020-08-18 17:12:26,577 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7ba575da3/d9336a143bc54a52b7eb9930d5ae9d64 [2020-08-18 17:12:26,588 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:12:26,590 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:12:26,591 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:12:26,591 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:12:26,595 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:12:26,596 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:12:26" (1/1) ... [2020-08-18 17:12:26,599 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55e164ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:26, skipping insertion in model container [2020-08-18 17:12:26,599 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:12:26" (1/1) ... [2020-08-18 17:12:26,607 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:12:26,623 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:12:26,802 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:12:26,807 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:12:26,827 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:12:26,847 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:12:26,847 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:26 WrapperNode [2020-08-18 17:12:26,847 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:12:26,848 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:12:26,848 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:12:26,848 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:12:26,943 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:26" (1/1) ... [2020-08-18 17:12:26,944 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:26" (1/1) ... [2020-08-18 17:12:26,951 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:26" (1/1) ... [2020-08-18 17:12:26,951 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:26" (1/1) ... [2020-08-18 17:12:26,957 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:26" (1/1) ... [2020-08-18 17:12:26,962 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:26" (1/1) ... [2020-08-18 17:12:26,963 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:26" (1/1) ... [2020-08-18 17:12:26,965 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:12:26,966 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:12:26,966 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:12:26,966 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:12:26,967 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:26" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:12:27,024 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:12:27,024 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:12:27,024 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 17:12:27,024 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:12:27,025 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:12:27,025 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 17:12:27,025 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:12:27,025 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 17:12:27,025 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 17:12:27,026 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 17:12:27,026 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 17:12:27,026 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:12:27,026 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:12:27,230 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:12:27,230 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 17:12:27,235 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:12:27 BoogieIcfgContainer [2020-08-18 17:12:27,235 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:12:27,240 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:12:27,240 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:12:27,247 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:12:27,247 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:12:26" (1/3) ... [2020-08-18 17:12:27,251 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45f852ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:12:27, skipping insertion in model container [2020-08-18 17:12:27,251 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:26" (2/3) ... [2020-08-18 17:12:27,252 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45f852ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:12:27, skipping insertion in model container [2020-08-18 17:12:27,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:12:27" (3/3) ... [2020-08-18 17:12:27,257 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-18 17:12:27,289 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:12:27,310 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:12:27,342 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:12:27,373 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:12:27,374 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:12:27,374 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:12:27,374 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:12:27,374 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:12:27,374 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:12:27,374 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:12:27,375 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:12:27,390 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-18 17:12:27,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 17:12:27,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:27,396 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:27,396 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:27,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:27,401 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-18 17:12:27,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:27,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941094568] [2020-08-18 17:12:27,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:27,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:27,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:27,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:27,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:27,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941094568] [2020-08-18 17:12:27,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:12:27,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 17:12:27,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370853487] [2020-08-18 17:12:27,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 17:12:27,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:27,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 17:12:27,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:12:27,627 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-18 17:12:27,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:27,701 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-18 17:12:27,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 17:12:27,703 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-18 17:12:27,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:27,712 INFO L225 Difference]: With dead ends: 34 [2020-08-18 17:12:27,712 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 17:12:27,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:12:27,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 17:12:27,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 17:12:27,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 17:12:27,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 17:12:27,750 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 17:12:27,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:27,751 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 17:12:27,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 17:12:27,752 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 17:12:27,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 17:12:27,752 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:27,753 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:27,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:12:27,754 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:27,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:27,754 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-18 17:12:27,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:27,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1321438145] [2020-08-18 17:12:27,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:27,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:27,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:27,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:27,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:27,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1321438145] [2020-08-18 17:12:27,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:12:27,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:12:27,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207235308] [2020-08-18 17:12:27,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:12:27,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:27,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:12:27,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:12:27,851 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-18 17:12:27,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:27,905 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 17:12:27,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 17:12:27,906 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 17:12:27,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:27,907 INFO L225 Difference]: With dead ends: 22 [2020-08-18 17:12:27,907 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 17:12:27,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:12:27,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 17:12:27,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-18 17:12:27,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 17:12:27,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 17:12:27,914 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-18 17:12:27,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:27,915 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 17:12:27,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:12:27,915 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 17:12:27,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 17:12:27,916 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:27,916 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:27,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:12:27,917 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:27,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:27,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-18 17:12:27,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:27,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [95144975] [2020-08-18 17:12:27,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:27,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:27,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:27,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:27,986 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:27,987 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [95144975] [2020-08-18 17:12:27,987 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:27,987 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 17:12:27,987 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874377898] [2020-08-18 17:12:27,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:12:27,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:27,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:12:27,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:12:27,989 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-18 17:12:28,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:28,037 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 17:12:28,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:12:28,038 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-18 17:12:28,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:28,039 INFO L225 Difference]: With dead ends: 24 [2020-08-18 17:12:28,039 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 17:12:28,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:12:28,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 17:12:28,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-18 17:12:28,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 17:12:28,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 17:12:28,046 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-18 17:12:28,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:28,046 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 17:12:28,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:12:28,046 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 17:12:28,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 17:12:28,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:28,047 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:28,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:12:28,048 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:28,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:28,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-18 17:12:28,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:28,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1896469064] [2020-08-18 17:12:28,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:28,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:28,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,135 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:28,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1896469064] [2020-08-18 17:12:28,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:28,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 17:12:28,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537826107] [2020-08-18 17:12:28,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:12:28,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:28,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:12:28,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:12:28,138 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-18 17:12:28,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:28,194 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 17:12:28,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:12:28,195 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-18 17:12:28,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:28,196 INFO L225 Difference]: With dead ends: 26 [2020-08-18 17:12:28,196 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 17:12:28,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:12:28,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 17:12:28,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-18 17:12:28,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 17:12:28,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 17:12:28,202 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-18 17:12:28,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:28,203 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 17:12:28,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:12:28,203 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 17:12:28,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 17:12:28,204 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:28,204 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:28,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:12:28,205 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:28,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:28,205 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-18 17:12:28,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:28,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650555884] [2020-08-18 17:12:28,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:28,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:28,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,286 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:28,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [650555884] [2020-08-18 17:12:28,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:28,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 17:12:28,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941627368] [2020-08-18 17:12:28,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 17:12:28,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:28,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 17:12:28,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:12:28,289 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-18 17:12:28,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:28,350 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 17:12:28,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 17:12:28,351 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 17:12:28,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:28,351 INFO L225 Difference]: With dead ends: 28 [2020-08-18 17:12:28,352 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 17:12:28,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:12:28,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 17:12:28,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 17:12:28,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 17:12:28,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 17:12:28,359 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-18 17:12:28,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:28,359 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 17:12:28,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 17:12:28,360 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 17:12:28,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 17:12:28,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:28,361 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:28,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:12:28,361 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:28,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:28,362 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-18 17:12:28,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:28,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215202844] [2020-08-18 17:12:28,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:28,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:28,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,464 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:28,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215202844] [2020-08-18 17:12:28,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:28,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 17:12:28,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036170918] [2020-08-18 17:12:28,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 17:12:28,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:28,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 17:12:28,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:12:28,467 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-18 17:12:28,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:28,530 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 17:12:28,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 17:12:28,531 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-18 17:12:28,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:28,532 INFO L225 Difference]: With dead ends: 30 [2020-08-18 17:12:28,532 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 17:12:28,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:12:28,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 17:12:28,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 17:12:28,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 17:12:28,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 17:12:28,538 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-18 17:12:28,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:28,539 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 17:12:28,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 17:12:28,539 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 17:12:28,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 17:12:28,540 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:28,540 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:28,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:12:28,540 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:28,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:28,541 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-18 17:12:28,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:28,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1596088814] [2020-08-18 17:12:28,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:28,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:28,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,691 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:28,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1596088814] [2020-08-18 17:12:28,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:28,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 17:12:28,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177679250] [2020-08-18 17:12:28,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 17:12:28,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:28,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 17:12:28,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:12:28,693 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-18 17:12:28,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:28,753 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 17:12:28,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 17:12:28,754 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-18 17:12:28,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:28,755 INFO L225 Difference]: With dead ends: 32 [2020-08-18 17:12:28,755 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 17:12:28,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:12:28,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 17:12:28,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 17:12:28,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 17:12:28,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 17:12:28,762 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-18 17:12:28,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:28,762 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 17:12:28,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 17:12:28,762 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 17:12:28,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 17:12:28,763 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:28,763 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:28,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 17:12:28,764 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:28,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:28,764 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-18 17:12:28,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:28,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933611921] [2020-08-18 17:12:28,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:28,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:28,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,859 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:28,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933611921] [2020-08-18 17:12:28,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:28,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 17:12:28,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714853796] [2020-08-18 17:12:28,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 17:12:28,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:28,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 17:12:28,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:12:28,861 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-18 17:12:28,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:28,943 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 17:12:28,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 17:12:28,944 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-18 17:12:28,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:28,944 INFO L225 Difference]: With dead ends: 34 [2020-08-18 17:12:28,945 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 17:12:28,947 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:12:28,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 17:12:28,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 17:12:28,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 17:12:28,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 17:12:28,955 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-18 17:12:28,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:28,955 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 17:12:28,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 17:12:28,955 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 17:12:28,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 17:12:28,960 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:28,960 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:28,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 17:12:28,961 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:28,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:28,961 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-18 17:12:28,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:28,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [749584105] [2020-08-18 17:12:28,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:28,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:29,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:29,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:29,065 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:29,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [749584105] [2020-08-18 17:12:29,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:29,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 17:12:29,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347901958] [2020-08-18 17:12:29,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 17:12:29,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:29,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 17:12:29,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:12:29,068 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-18 17:12:29,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:29,141 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 17:12:29,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 17:12:29,142 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-18 17:12:29,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:29,143 INFO L225 Difference]: With dead ends: 36 [2020-08-18 17:12:29,143 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 17:12:29,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:12:29,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 17:12:29,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 17:12:29,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 17:12:29,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 17:12:29,148 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-18 17:12:29,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:29,149 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 17:12:29,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 17:12:29,149 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 17:12:29,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 17:12:29,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:29,150 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:29,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 17:12:29,151 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:29,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:29,151 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-18 17:12:29,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:29,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [455207677] [2020-08-18 17:12:29,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:29,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:29,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:29,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:29,286 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:29,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [455207677] [2020-08-18 17:12:29,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:29,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 17:12:29,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400292672] [2020-08-18 17:12:29,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 17:12:29,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:29,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 17:12:29,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:12:29,289 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-18 17:12:29,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:29,366 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 17:12:29,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 17:12:29,367 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-18 17:12:29,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:29,368 INFO L225 Difference]: With dead ends: 38 [2020-08-18 17:12:29,368 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 17:12:29,369 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:12:29,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 17:12:29,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 17:12:29,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 17:12:29,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 17:12:29,374 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-18 17:12:29,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:29,374 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 17:12:29,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 17:12:29,375 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 17:12:29,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 17:12:29,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:29,376 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:29,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 17:12:29,376 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:29,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:29,377 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-18 17:12:29,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:29,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [973454491] [2020-08-18 17:12:29,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:29,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:29,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:29,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:29,511 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:29,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [973454491] [2020-08-18 17:12:29,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:29,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:12:29,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156720555] [2020-08-18 17:12:29,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:12:29,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:29,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:12:29,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:12:29,513 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-18 17:12:29,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:29,577 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 17:12:29,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 17:12:29,577 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-18 17:12:29,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:29,578 INFO L225 Difference]: With dead ends: 40 [2020-08-18 17:12:29,578 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 17:12:29,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:12:29,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 17:12:29,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 17:12:29,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 17:12:29,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 17:12:29,584 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-18 17:12:29,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:29,584 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 17:12:29,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:12:29,584 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 17:12:29,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 17:12:29,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:29,585 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:29,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 17:12:29,586 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:29,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:29,586 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-18 17:12:29,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:29,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851270157] [2020-08-18 17:12:29,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:29,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:29,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:29,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:29,747 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:29,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851270157] [2020-08-18 17:12:29,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:29,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 17:12:29,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328728764] [2020-08-18 17:12:29,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 17:12:29,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:29,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 17:12:29,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 17:12:29,750 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-18 17:12:29,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:29,815 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 17:12:29,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 17:12:29,815 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-18 17:12:29,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:29,816 INFO L225 Difference]: With dead ends: 42 [2020-08-18 17:12:29,816 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 17:12:29,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 17:12:29,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 17:12:29,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 17:12:29,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 17:12:29,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 17:12:29,822 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-18 17:12:29,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:29,822 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 17:12:29,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 17:12:29,823 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 17:12:29,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 17:12:29,823 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:29,824 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:29,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 17:12:29,824 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:29,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:29,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-18 17:12:29,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:29,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463067178] [2020-08-18 17:12:29,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:29,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:29,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:29,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:29,978 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:29,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463067178] [2020-08-18 17:12:29,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:29,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 17:12:29,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088542768] [2020-08-18 17:12:29,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 17:12:29,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:29,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 17:12:29,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:12:29,980 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-18 17:12:30,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:30,081 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 17:12:30,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 17:12:30,081 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-18 17:12:30,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:30,082 INFO L225 Difference]: With dead ends: 44 [2020-08-18 17:12:30,082 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 17:12:30,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:12:30,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 17:12:30,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 17:12:30,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 17:12:30,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 17:12:30,088 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-18 17:12:30,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:30,089 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 17:12:30,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 17:12:30,089 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 17:12:30,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 17:12:30,090 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:30,090 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:30,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 17:12:30,090 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:30,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:30,091 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-18 17:12:30,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:30,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988423559] [2020-08-18 17:12:30,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:30,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:30,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:30,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:30,293 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:30,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1988423559] [2020-08-18 17:12:30,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:30,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 17:12:30,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612174456] [2020-08-18 17:12:30,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 17:12:30,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:30,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 17:12:30,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-18 17:12:30,297 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-18 17:12:30,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:30,370 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 17:12:30,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 17:12:30,371 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-18 17:12:30,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:30,372 INFO L225 Difference]: With dead ends: 46 [2020-08-18 17:12:30,372 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 17:12:30,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-18 17:12:30,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 17:12:30,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 17:12:30,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 17:12:30,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 17:12:30,379 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-18 17:12:30,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:30,382 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 17:12:30,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 17:12:30,382 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 17:12:30,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 17:12:30,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:30,383 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:30,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 17:12:30,384 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:30,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:30,384 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-18 17:12:30,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:30,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1202244913] [2020-08-18 17:12:30,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:30,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:30,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:30,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:30,589 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:30,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1202244913] [2020-08-18 17:12:30,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:30,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 17:12:30,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997982142] [2020-08-18 17:12:30,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 17:12:30,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:30,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 17:12:30,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-18 17:12:30,592 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-18 17:12:30,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:30,690 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 17:12:30,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 17:12:30,691 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-18 17:12:30,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:30,692 INFO L225 Difference]: With dead ends: 48 [2020-08-18 17:12:30,692 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 17:12:30,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-18 17:12:30,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 17:12:30,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 17:12:30,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 17:12:30,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 17:12:30,697 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-18 17:12:30,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:30,697 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 17:12:30,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 17:12:30,697 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 17:12:30,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 17:12:30,698 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:30,698 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:30,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 17:12:30,699 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:30,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:30,699 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-18 17:12:30,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:30,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841761363] [2020-08-18 17:12:30,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:30,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:30,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:30,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:30,884 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:30,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841761363] [2020-08-18 17:12:30,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:30,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 17:12:30,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164145600] [2020-08-18 17:12:30,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 17:12:30,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:30,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 17:12:30,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-18 17:12:30,887 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-18 17:12:30,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:30,988 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 17:12:30,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 17:12:30,988 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-18 17:12:30,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:30,989 INFO L225 Difference]: With dead ends: 50 [2020-08-18 17:12:30,989 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 17:12:30,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-18 17:12:30,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 17:12:30,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 17:12:30,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 17:12:30,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 17:12:30,994 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-18 17:12:30,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:30,994 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 17:12:30,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 17:12:30,995 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 17:12:30,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 17:12:30,995 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:30,996 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:30,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 17:12:30,996 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:30,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:30,996 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-18 17:12:30,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:30,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607275486] [2020-08-18 17:12:30,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:31,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:31,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:31,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:31,187 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:31,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607275486] [2020-08-18 17:12:31,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:31,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 17:12:31,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357013380] [2020-08-18 17:12:31,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 17:12:31,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:31,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 17:12:31,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-18 17:12:31,190 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-18 17:12:31,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:31,285 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 17:12:31,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 17:12:31,285 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-18 17:12:31,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:31,286 INFO L225 Difference]: With dead ends: 52 [2020-08-18 17:12:31,286 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 17:12:31,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-18 17:12:31,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 17:12:31,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 17:12:31,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 17:12:31,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 17:12:31,291 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-18 17:12:31,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:31,291 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 17:12:31,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 17:12:31,292 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 17:12:31,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 17:12:31,293 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:31,293 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:31,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 17:12:31,293 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:31,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:31,293 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-18 17:12:31,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:31,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1893195215] [2020-08-18 17:12:31,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:31,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:31,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:31,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:31,518 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:31,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1893195215] [2020-08-18 17:12:31,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:31,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 17:12:31,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309136610] [2020-08-18 17:12:31,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 17:12:31,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:31,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 17:12:31,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-18 17:12:31,521 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-18 17:12:31,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:31,633 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 17:12:31,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 17:12:31,634 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-18 17:12:31,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:31,634 INFO L225 Difference]: With dead ends: 54 [2020-08-18 17:12:31,635 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 17:12:31,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-18 17:12:31,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 17:12:31,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-18 17:12:31,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 17:12:31,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 17:12:31,640 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-18 17:12:31,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:31,641 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 17:12:31,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 17:12:31,641 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 17:12:31,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 17:12:31,642 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:31,642 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:31,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 17:12:31,642 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:31,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:31,643 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-18 17:12:31,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:31,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1215788090] [2020-08-18 17:12:31,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:31,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:31,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:31,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:31,893 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:31,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1215788090] [2020-08-18 17:12:31,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:31,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 17:12:31,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518054250] [2020-08-18 17:12:31,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 17:12:31,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:31,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 17:12:31,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-18 17:12:31,896 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-18 17:12:31,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:31,993 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 17:12:31,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 17:12:31,993 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-18 17:12:31,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:31,994 INFO L225 Difference]: With dead ends: 56 [2020-08-18 17:12:31,994 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 17:12:31,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-18 17:12:31,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 17:12:32,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-18 17:12:32,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 17:12:32,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 17:12:32,002 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-18 17:12:32,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:32,002 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 17:12:32,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 17:12:32,003 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 17:12:32,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 17:12:32,003 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:32,003 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:32,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 17:12:32,004 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:32,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:32,004 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-18 17:12:32,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:32,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443214235] [2020-08-18 17:12:32,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:32,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:32,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:32,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:32,319 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:32,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443214235] [2020-08-18 17:12:32,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:32,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 17:12:32,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9685932] [2020-08-18 17:12:32,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 17:12:32,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:32,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 17:12:32,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-18 17:12:32,322 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-18 17:12:32,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:32,409 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 17:12:32,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 17:12:32,410 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-18 17:12:32,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:32,411 INFO L225 Difference]: With dead ends: 58 [2020-08-18 17:12:32,411 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 17:12:32,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-18 17:12:32,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 17:12:32,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 17:12:32,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 17:12:32,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 17:12:32,420 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-18 17:12:32,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:32,421 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 17:12:32,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 17:12:32,421 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 17:12:32,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 17:12:32,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:32,422 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:32,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 17:12:32,422 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:32,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:32,423 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-18 17:12:32,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:32,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [841484376] [2020-08-18 17:12:32,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:32,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:32,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:32,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:32,750 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:32,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [841484376] [2020-08-18 17:12:32,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:32,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 17:12:32,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121909240] [2020-08-18 17:12:32,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 17:12:32,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:32,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 17:12:32,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-18 17:12:32,756 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-18 17:12:32,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:32,882 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 17:12:32,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 17:12:32,882 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-18 17:12:32,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:32,883 INFO L225 Difference]: With dead ends: 60 [2020-08-18 17:12:32,883 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 17:12:32,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-18 17:12:32,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 17:12:32,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 17:12:32,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 17:12:32,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 17:12:32,894 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-18 17:12:32,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:32,894 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 17:12:32,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 17:12:32,895 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 17:12:32,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 17:12:32,895 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:32,896 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:32,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 17:12:32,896 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:32,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:32,899 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-18 17:12:32,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:32,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523352759] [2020-08-18 17:12:32,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:32,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:33,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:33,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:33,206 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:33,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523352759] [2020-08-18 17:12:33,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:33,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 17:12:33,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896408566] [2020-08-18 17:12:33,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 17:12:33,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:33,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 17:12:33,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-18 17:12:33,209 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-18 17:12:33,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:33,295 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 17:12:33,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 17:12:33,297 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-18 17:12:33,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:33,298 INFO L225 Difference]: With dead ends: 62 [2020-08-18 17:12:33,298 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 17:12:33,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-18 17:12:33,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 17:12:33,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 17:12:33,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 17:12:33,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 17:12:33,306 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-18 17:12:33,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:33,306 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 17:12:33,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 17:12:33,306 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 17:12:33,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 17:12:33,307 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:33,307 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:33,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 17:12:33,308 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:33,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:33,308 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-18 17:12:33,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:33,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1695539165] [2020-08-18 17:12:33,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:33,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:33,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:33,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:33,664 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:33,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1695539165] [2020-08-18 17:12:33,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:33,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 17:12:33,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256594758] [2020-08-18 17:12:33,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 17:12:33,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:33,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 17:12:33,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-18 17:12:33,667 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-18 17:12:33,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:33,873 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 17:12:33,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 17:12:33,874 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-18 17:12:33,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:33,874 INFO L225 Difference]: With dead ends: 64 [2020-08-18 17:12:33,874 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 17:12:33,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-18 17:12:33,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 17:12:33,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 17:12:33,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 17:12:33,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 17:12:33,888 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-18 17:12:33,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:33,890 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 17:12:33,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 17:12:33,890 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 17:12:33,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 17:12:33,891 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:33,891 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:33,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 17:12:33,891 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:33,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:33,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-18 17:12:33,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:33,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000583856] [2020-08-18 17:12:33,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:33,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:34,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:34,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:34,245 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:34,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000583856] [2020-08-18 17:12:34,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:34,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 17:12:34,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633140469] [2020-08-18 17:12:34,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 17:12:34,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:34,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 17:12:34,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-18 17:12:34,248 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-18 17:12:34,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:34,404 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-18 17:12:34,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 17:12:34,404 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-18 17:12:34,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:34,405 INFO L225 Difference]: With dead ends: 66 [2020-08-18 17:12:34,405 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 17:12:34,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-18 17:12:34,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 17:12:34,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 17:12:34,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 17:12:34,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 17:12:34,412 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-18 17:12:34,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:34,412 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 17:12:34,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 17:12:34,412 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 17:12:34,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 17:12:34,414 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:34,414 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:34,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 17:12:34,419 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:34,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:34,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-18 17:12:34,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:34,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2123838349] [2020-08-18 17:12:34,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:34,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:34,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:34,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:34,837 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:34,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2123838349] [2020-08-18 17:12:34,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:34,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 17:12:34,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056114987] [2020-08-18 17:12:34,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 17:12:34,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:34,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 17:12:34,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-18 17:12:34,840 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-18 17:12:34,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:34,978 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-18 17:12:34,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 17:12:34,978 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-18 17:12:34,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:34,979 INFO L225 Difference]: With dead ends: 68 [2020-08-18 17:12:34,980 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 17:12:34,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-18 17:12:34,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 17:12:34,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 17:12:34,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 17:12:34,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-18 17:12:34,984 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-18 17:12:34,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:34,984 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-18 17:12:34,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 17:12:34,985 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-18 17:12:34,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 17:12:34,985 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:34,985 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:34,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 17:12:34,986 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:34,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:34,986 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-18 17:12:34,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:34,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761916953] [2020-08-18 17:12:34,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:35,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:35,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:35,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:35,426 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:35,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761916953] [2020-08-18 17:12:35,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:35,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 17:12:35,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911402147] [2020-08-18 17:12:35,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 17:12:35,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:35,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 17:12:35,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-18 17:12:35,428 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-18 17:12:35,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:35,615 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-18 17:12:35,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 17:12:35,616 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-18 17:12:35,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:35,617 INFO L225 Difference]: With dead ends: 70 [2020-08-18 17:12:35,617 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 17:12:35,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-18 17:12:35,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 17:12:35,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 17:12:35,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 17:12:35,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-18 17:12:35,621 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-18 17:12:35,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:35,622 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-18 17:12:35,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 17:12:35,622 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-18 17:12:35,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 17:12:35,622 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:35,623 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:35,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 17:12:35,623 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:35,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:35,623 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-18 17:12:35,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:35,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251738413] [2020-08-18 17:12:35,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:35,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:36,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,033 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:36,033 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251738413] [2020-08-18 17:12:36,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:36,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 17:12:36,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585764413] [2020-08-18 17:12:36,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 17:12:36,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:36,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 17:12:36,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-18 17:12:36,035 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-18 17:12:36,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:36,214 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-18 17:12:36,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 17:12:36,215 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-18 17:12:36,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:36,216 INFO L225 Difference]: With dead ends: 72 [2020-08-18 17:12:36,216 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 17:12:36,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-18 17:12:36,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 17:12:36,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 17:12:36,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 17:12:36,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-18 17:12:36,222 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-18 17:12:36,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:36,222 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-18 17:12:36,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 17:12:36,222 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-18 17:12:36,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 17:12:36,223 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:36,223 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:36,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 17:12:36,224 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:36,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:36,224 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-18 17:12:36,224 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:36,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [884609791] [2020-08-18 17:12:36,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:36,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:36,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,678 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:36,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [884609791] [2020-08-18 17:12:36,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:36,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 17:12:36,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160424192] [2020-08-18 17:12:36,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 17:12:36,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:36,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 17:12:36,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-18 17:12:36,680 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-18 17:12:36,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:36,849 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-18 17:12:36,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 17:12:36,850 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-18 17:12:36,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:36,850 INFO L225 Difference]: With dead ends: 74 [2020-08-18 17:12:36,850 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 17:12:36,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-18 17:12:36,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 17:12:36,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 17:12:36,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 17:12:36,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-18 17:12:36,855 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-18 17:12:36,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:36,855 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-18 17:12:36,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 17:12:36,855 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-18 17:12:36,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 17:12:36,856 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:36,856 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:36,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 17:12:36,856 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:36,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:36,857 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-18 17:12:36,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:36,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199690740] [2020-08-18 17:12:36,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:36,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:37,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:37,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:37,446 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:37,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199690740] [2020-08-18 17:12:37,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:37,447 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 17:12:37,447 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898528735] [2020-08-18 17:12:37,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 17:12:37,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:37,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 17:12:37,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-18 17:12:37,449 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-18 17:12:37,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:37,668 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-18 17:12:37,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 17:12:37,668 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-18 17:12:37,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:37,669 INFO L225 Difference]: With dead ends: 76 [2020-08-18 17:12:37,669 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 17:12:37,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-18 17:12:37,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 17:12:37,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 17:12:37,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 17:12:37,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-18 17:12:37,676 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-18 17:12:37,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:37,676 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-18 17:12:37,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 17:12:37,677 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-18 17:12:37,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 17:12:37,678 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:37,678 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:37,678 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 17:12:37,678 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:37,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:37,679 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-18 17:12:37,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:37,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343027643] [2020-08-18 17:12:37,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:37,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:38,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:38,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:38,382 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:38,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343027643] [2020-08-18 17:12:38,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:38,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 17:12:38,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562430191] [2020-08-18 17:12:38,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 17:12:38,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:38,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 17:12:38,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-18 17:12:38,386 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-18 17:12:38,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:38,606 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-18 17:12:38,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 17:12:38,607 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-18 17:12:38,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:38,607 INFO L225 Difference]: With dead ends: 78 [2020-08-18 17:12:38,608 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 17:12:38,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-18 17:12:38,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 17:12:38,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 17:12:38,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 17:12:38,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-18 17:12:38,613 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-18 17:12:38,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:38,613 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-18 17:12:38,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 17:12:38,613 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-18 17:12:38,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 17:12:38,629 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:38,629 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:38,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 17:12:38,629 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:38,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:38,629 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-18 17:12:38,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:38,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612471631] [2020-08-18 17:12:38,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:38,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:39,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:39,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:39,189 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:39,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612471631] [2020-08-18 17:12:39,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:39,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 17:12:39,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461177089] [2020-08-18 17:12:39,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 17:12:39,190 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:39,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 17:12:39,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 17:12:39,191 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-18 17:12:39,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:39,380 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-18 17:12:39,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 17:12:39,381 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-18 17:12:39,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:39,381 INFO L225 Difference]: With dead ends: 80 [2020-08-18 17:12:39,382 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 17:12:39,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 17:12:39,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 17:12:39,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 17:12:39,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 17:12:39,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-18 17:12:39,386 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-18 17:12:39,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:39,386 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-18 17:12:39,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 17:12:39,387 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-18 17:12:39,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 17:12:39,387 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:39,387 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:39,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 17:12:39,388 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:39,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:39,388 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-18 17:12:39,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:39,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [716302458] [2020-08-18 17:12:39,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:39,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:40,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:40,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:40,051 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:40,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [716302458] [2020-08-18 17:12:40,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:40,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 17:12:40,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608359728] [2020-08-18 17:12:40,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 17:12:40,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:40,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 17:12:40,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 17:12:40,054 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-18 17:12:40,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:40,270 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-18 17:12:40,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 17:12:40,271 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-18 17:12:40,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:40,273 INFO L225 Difference]: With dead ends: 82 [2020-08-18 17:12:40,273 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 17:12:40,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 17:12:40,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 17:12:40,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 17:12:40,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 17:12:40,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-18 17:12:40,279 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-18 17:12:40,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:40,279 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-18 17:12:40,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 17:12:40,279 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-18 17:12:40,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 17:12:40,280 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:40,281 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:40,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 17:12:40,281 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:40,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:40,282 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-18 17:12:40,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:40,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [198890651] [2020-08-18 17:12:40,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:40,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:40,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:40,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:40,865 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:40,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [198890651] [2020-08-18 17:12:40,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:40,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 17:12:40,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144712603] [2020-08-18 17:12:40,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 17:12:40,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:40,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 17:12:40,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 17:12:40,868 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-18 17:12:41,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:41,041 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-18 17:12:41,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 17:12:41,042 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-18 17:12:41,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:41,043 INFO L225 Difference]: With dead ends: 84 [2020-08-18 17:12:41,043 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 17:12:41,044 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 17:12:41,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 17:12:41,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 17:12:41,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 17:12:41,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-18 17:12:41,051 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-18 17:12:41,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:41,051 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-18 17:12:41,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 17:12:41,052 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-18 17:12:41,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 17:12:41,055 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:41,055 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:41,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 17:12:41,055 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:41,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:41,056 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-18 17:12:41,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:41,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233822416] [2020-08-18 17:12:41,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:41,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:41,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:41,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:41,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:41,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233822416] [2020-08-18 17:12:41,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:41,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 17:12:41,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595641909] [2020-08-18 17:12:41,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 17:12:41,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:41,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 17:12:41,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 17:12:41,777 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-18 17:12:41,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:41,935 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-18 17:12:41,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 17:12:41,935 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-18 17:12:41,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:41,936 INFO L225 Difference]: With dead ends: 86 [2020-08-18 17:12:41,936 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 17:12:41,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 17:12:41,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 17:12:41,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 17:12:41,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 17:12:41,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-18 17:12:41,942 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-18 17:12:41,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:41,943 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-18 17:12:41,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 17:12:41,943 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-18 17:12:41,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 17:12:41,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:41,944 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:41,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 17:12:41,945 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:41,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:41,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-18 17:12:41,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:41,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676028449] [2020-08-18 17:12:41,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:41,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:42,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:42,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:42,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:42,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676028449] [2020-08-18 17:12:42,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:42,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 17:12:42,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859697011] [2020-08-18 17:12:42,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 17:12:42,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:42,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 17:12:42,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 17:12:42,647 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-18 17:12:42,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:42,874 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-18 17:12:42,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 17:12:42,874 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-18 17:12:42,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:42,875 INFO L225 Difference]: With dead ends: 88 [2020-08-18 17:12:42,875 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 17:12:42,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 17:12:42,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 17:12:42,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 17:12:42,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 17:12:42,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-18 17:12:42,880 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-18 17:12:42,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:42,880 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-18 17:12:42,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 17:12:42,880 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-18 17:12:42,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 17:12:42,881 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:42,881 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:42,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 17:12:42,882 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:42,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:42,882 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-18 17:12:42,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:42,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [819121052] [2020-08-18 17:12:42,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:42,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:43,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:43,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:43,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:43,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [819121052] [2020-08-18 17:12:43,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:43,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 17:12:43,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948804034] [2020-08-18 17:12:43,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 17:12:43,624 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:43,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 17:12:43,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 17:12:43,625 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-18 17:12:43,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:43,831 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-18 17:12:43,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 17:12:43,832 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-18 17:12:43,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:43,833 INFO L225 Difference]: With dead ends: 90 [2020-08-18 17:12:43,833 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 17:12:43,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 17:12:43,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 17:12:43,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 17:12:43,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 17:12:43,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-18 17:12:43,838 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-18 17:12:43,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:43,838 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-18 17:12:43,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 17:12:43,838 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-18 17:12:43,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 17:12:43,839 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:43,839 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:43,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 17:12:43,839 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:43,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:43,840 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-18 17:12:43,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:43,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [940488892] [2020-08-18 17:12:43,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:43,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:44,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:44,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:44,650 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:44,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [940488892] [2020-08-18 17:12:44,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:44,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 17:12:44,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303656701] [2020-08-18 17:12:44,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 17:12:44,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:44,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 17:12:44,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 17:12:44,652 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-18 17:12:44,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:44,795 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-18 17:12:44,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 17:12:44,795 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-18 17:12:44,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:44,796 INFO L225 Difference]: With dead ends: 92 [2020-08-18 17:12:44,796 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 17:12:44,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 17:12:44,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 17:12:44,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 17:12:44,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 17:12:44,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-18 17:12:44,801 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-18 17:12:44,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:44,801 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-18 17:12:44,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 17:12:44,801 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-18 17:12:44,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 17:12:44,802 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:44,802 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:44,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 17:12:44,802 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:44,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:44,803 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-18 17:12:44,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:44,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103893941] [2020-08-18 17:12:44,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:44,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:45,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:45,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:45,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:45,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103893941] [2020-08-18 17:12:45,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:45,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 17:12:45,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979073987] [2020-08-18 17:12:45,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 17:12:45,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:45,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 17:12:45,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 17:12:45,632 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-18 17:12:45,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:45,897 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-18 17:12:45,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 17:12:45,898 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-18 17:12:45,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:45,899 INFO L225 Difference]: With dead ends: 94 [2020-08-18 17:12:45,899 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 17:12:45,901 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 17:12:45,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 17:12:45,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 17:12:45,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 17:12:45,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-18 17:12:45,906 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-18 17:12:45,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:45,906 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-18 17:12:45,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 17:12:45,906 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-18 17:12:45,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 17:12:45,907 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:45,907 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:45,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 17:12:45,907 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:45,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:45,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-18 17:12:45,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:45,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1832173547] [2020-08-18 17:12:45,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:45,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:46,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:46,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:46,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:46,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1832173547] [2020-08-18 17:12:46,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:46,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 17:12:46,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379618900] [2020-08-18 17:12:46,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 17:12:46,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:46,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 17:12:46,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 17:12:46,756 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-18 17:12:47,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:47,009 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-18 17:12:47,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 17:12:47,011 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-18 17:12:47,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:47,011 INFO L225 Difference]: With dead ends: 96 [2020-08-18 17:12:47,012 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 17:12:47,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 17:12:47,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 17:12:47,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 17:12:47,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 17:12:47,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-18 17:12:47,016 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-18 17:12:47,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:47,016 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-18 17:12:47,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 17:12:47,016 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-18 17:12:47,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 17:12:47,017 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:47,017 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:47,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 17:12:47,017 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:47,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:47,018 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-18 17:12:47,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:47,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703982375] [2020-08-18 17:12:47,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:47,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:47,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:47,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:47,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:47,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703982375] [2020-08-18 17:12:47,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:47,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 17:12:47,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694058294] [2020-08-18 17:12:47,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 17:12:47,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:47,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 17:12:47,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 17:12:47,913 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-18 17:12:48,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:48,167 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-18 17:12:48,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 17:12:48,168 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-18 17:12:48,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:48,169 INFO L225 Difference]: With dead ends: 98 [2020-08-18 17:12:48,169 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 17:12:48,171 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 17:12:48,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 17:12:48,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 17:12:48,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 17:12:48,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-18 17:12:48,175 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-18 17:12:48,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:48,175 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-18 17:12:48,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 17:12:48,176 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-18 17:12:48,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 17:12:48,176 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:48,176 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:48,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 17:12:48,176 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:48,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:48,177 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-18 17:12:48,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:48,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808005873] [2020-08-18 17:12:48,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:48,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:49,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:49,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:49,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:49,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1808005873] [2020-08-18 17:12:49,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:49,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 17:12:49,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948345186] [2020-08-18 17:12:49,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 17:12:49,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:49,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 17:12:49,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 17:12:49,164 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-18 17:12:49,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:49,460 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-18 17:12:49,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 17:12:49,461 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-18 17:12:49,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:49,463 INFO L225 Difference]: With dead ends: 100 [2020-08-18 17:12:49,463 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 17:12:49,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 17:12:49,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 17:12:49,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 17:12:49,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 17:12:49,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-18 17:12:49,469 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-18 17:12:49,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:49,470 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-18 17:12:49,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 17:12:49,471 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-18 17:12:49,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 17:12:49,472 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:49,472 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:49,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 17:12:49,472 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:49,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:49,473 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-18 17:12:49,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:49,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [447283176] [2020-08-18 17:12:49,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:49,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:50,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:50,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:50,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:50,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [447283176] [2020-08-18 17:12:50,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:50,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 17:12:50,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276220109] [2020-08-18 17:12:50,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 17:12:50,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:50,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 17:12:50,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 17:12:50,834 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-18 17:12:51,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:51,083 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-18 17:12:51,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 17:12:51,083 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-18 17:12:51,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:51,085 INFO L225 Difference]: With dead ends: 102 [2020-08-18 17:12:51,085 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 17:12:51,086 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 17:12:51,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 17:12:51,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 17:12:51,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 17:12:51,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-18 17:12:51,092 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-18 17:12:51,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:51,092 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-18 17:12:51,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 17:12:51,093 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-18 17:12:51,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 17:12:51,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:51,094 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:51,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 17:12:51,094 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:51,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:51,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-18 17:12:51,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:51,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125577619] [2020-08-18 17:12:51,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:51,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:52,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:52,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:52,215 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:52,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125577619] [2020-08-18 17:12:52,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:52,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 17:12:52,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040889635] [2020-08-18 17:12:52,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 17:12:52,216 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:52,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 17:12:52,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 17:12:52,218 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-18 17:12:52,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:52,497 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-18 17:12:52,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 17:12:52,498 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-18 17:12:52,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:52,499 INFO L225 Difference]: With dead ends: 104 [2020-08-18 17:12:52,500 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 17:12:52,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 17:12:52,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 17:12:52,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 17:12:52,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 17:12:52,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-18 17:12:52,506 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-18 17:12:52,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:52,506 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-18 17:12:52,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 17:12:52,506 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-18 17:12:52,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 17:12:52,507 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:52,507 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:52,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 17:12:52,508 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:52,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:52,508 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-18 17:12:52,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:52,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639469475] [2020-08-18 17:12:52,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:52,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:53,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:53,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:53,605 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:53,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639469475] [2020-08-18 17:12:53,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:53,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 17:12:53,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692617078] [2020-08-18 17:12:53,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 17:12:53,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:53,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 17:12:53,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 17:12:53,607 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-18 17:12:53,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:53,784 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-18 17:12:53,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 17:12:53,785 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-18 17:12:53,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:53,786 INFO L225 Difference]: With dead ends: 106 [2020-08-18 17:12:53,786 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 17:12:53,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 17:12:53,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 17:12:53,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 17:12:53,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 17:12:53,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-18 17:12:53,793 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-18 17:12:53,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:53,794 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-18 17:12:53,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 17:12:53,794 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-18 17:12:53,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 17:12:53,795 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:53,795 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:53,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 17:12:53,795 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:53,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:53,795 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-18 17:12:53,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:53,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [388368707] [2020-08-18 17:12:53,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:53,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:55,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:55,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:55,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:55,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [388368707] [2020-08-18 17:12:55,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:55,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 17:12:55,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575075335] [2020-08-18 17:12:55,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 17:12:55,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:55,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 17:12:55,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 17:12:55,175 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-18 17:12:55,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:55,479 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-18 17:12:55,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 17:12:55,480 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-18 17:12:55,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:55,481 INFO L225 Difference]: With dead ends: 108 [2020-08-18 17:12:55,482 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 17:12:55,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 17:12:55,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 17:12:55,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 17:12:55,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 17:12:55,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-18 17:12:55,489 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-18 17:12:55,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:55,490 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-18 17:12:55,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 17:12:55,490 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-18 17:12:55,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 17:12:55,491 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:55,491 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:55,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 17:12:55,491 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:55,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:55,492 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-18 17:12:55,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:55,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856778439] [2020-08-18 17:12:55,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:55,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:56,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:56,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:56,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:56,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856778439] [2020-08-18 17:12:56,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:56,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 17:12:56,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098859553] [2020-08-18 17:12:56,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 17:12:56,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:56,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 17:12:56,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 17:12:56,699 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-18 17:12:56,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:56,909 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-18 17:12:56,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 17:12:56,909 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-18 17:12:56,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:56,911 INFO L225 Difference]: With dead ends: 110 [2020-08-18 17:12:56,911 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 17:12:56,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 17:12:56,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 17:12:56,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 17:12:56,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 17:12:56,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-18 17:12:56,917 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-18 17:12:56,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:56,917 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-18 17:12:56,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 17:12:56,917 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-18 17:12:56,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 17:12:56,918 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:56,918 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:56,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 17:12:56,918 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:56,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:56,919 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-18 17:12:56,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:56,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352595212] [2020-08-18 17:12:56,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:56,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:58,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,145 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:58,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352595212] [2020-08-18 17:12:58,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:58,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 17:12:58,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9037794] [2020-08-18 17:12:58,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 17:12:58,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:58,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 17:12:58,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 17:12:58,146 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-18 17:12:58,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:58,352 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-18 17:12:58,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 17:12:58,352 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-18 17:12:58,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:58,353 INFO L225 Difference]: With dead ends: 112 [2020-08-18 17:12:58,354 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 17:12:58,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 17:12:58,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 17:12:58,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 17:12:58,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 17:12:58,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-18 17:12:58,358 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-18 17:12:58,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:58,359 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-18 17:12:58,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 17:12:58,359 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-18 17:12:58,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-18 17:12:58,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:58,360 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:58,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 17:12:58,360 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:58,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:58,361 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-18 17:12:58,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:58,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [814286663] [2020-08-18 17:12:58,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:58,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:59,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:59,684 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:12:59,685 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [814286663] [2020-08-18 17:12:59,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:59,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 17:12:59,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215104700] [2020-08-18 17:12:59,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 17:12:59,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:59,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 17:12:59,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 17:12:59,687 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-18 17:12:59,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:59,861 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-18 17:12:59,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 17:12:59,861 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-18 17:12:59,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:59,863 INFO L225 Difference]: With dead ends: 114 [2020-08-18 17:12:59,863 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 17:12:59,864 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 17:12:59,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 17:12:59,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 17:12:59,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 17:12:59,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-18 17:12:59,869 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-18 17:12:59,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:59,869 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-18 17:12:59,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 17:12:59,869 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-18 17:12:59,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-18 17:12:59,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:59,870 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:59,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 17:12:59,871 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:59,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:59,871 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-18 17:12:59,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:59,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255056415] [2020-08-18 17:12:59,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:59,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:01,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:01,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:01,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:13:01,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255056415] [2020-08-18 17:13:01,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:01,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-18 17:13:01,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894523427] [2020-08-18 17:13:01,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-18 17:13:01,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:01,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-18 17:13:01,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-18 17:13:01,231 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-18 17:13:01,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:01,428 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-18 17:13:01,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-18 17:13:01,428 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-18 17:13:01,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:01,430 INFO L225 Difference]: With dead ends: 116 [2020-08-18 17:13:01,430 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 17:13:01,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-18 17:13:01,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 17:13:01,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-18 17:13:01,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 17:13:01,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-18 17:13:01,436 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-18 17:13:01,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:01,436 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-18 17:13:01,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-18 17:13:01,436 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-18 17:13:01,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-18 17:13:01,437 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:01,437 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:01,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-18 17:13:01,437 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:01,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:01,438 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-18 17:13:01,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:01,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296026168] [2020-08-18 17:13:01,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:01,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:02,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:02,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:02,862 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:13:02,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296026168] [2020-08-18 17:13:02,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:02,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-18 17:13:02,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726263885] [2020-08-18 17:13:02,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-18 17:13:02,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:02,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-18 17:13:02,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-18 17:13:02,864 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-18 17:13:03,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:03,064 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-18 17:13:03,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-18 17:13:03,065 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-18 17:13:03,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:03,066 INFO L225 Difference]: With dead ends: 118 [2020-08-18 17:13:03,067 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 17:13:03,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-18 17:13:03,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 17:13:03,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-18 17:13:03,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-18 17:13:03,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-18 17:13:03,072 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-18 17:13:03,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:03,072 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-18 17:13:03,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-18 17:13:03,072 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-18 17:13:03,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-18 17:13:03,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:03,073 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:03,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-18 17:13:03,074 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:03,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:03,074 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-18 17:13:03,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:03,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [223992871] [2020-08-18 17:13:03,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:03,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:04,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:04,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:04,563 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:13:04,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [223992871] [2020-08-18 17:13:04,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:04,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-18 17:13:04,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214250608] [2020-08-18 17:13:04,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-18 17:13:04,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:04,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-18 17:13:04,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-18 17:13:04,565 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-18 17:13:04,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:04,840 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-18 17:13:04,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-18 17:13:04,841 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-18 17:13:04,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:04,842 INFO L225 Difference]: With dead ends: 120 [2020-08-18 17:13:04,843 INFO L226 Difference]: Without dead ends: 114 [2020-08-18 17:13:04,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-18 17:13:04,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-18 17:13:04,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-18 17:13:04,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-18 17:13:04,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-18 17:13:04,846 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-18 17:13:04,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:04,847 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-18 17:13:04,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-18 17:13:04,847 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-18 17:13:04,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-18 17:13:04,847 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:04,847 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:04,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-18 17:13:04,848 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:04,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:04,848 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-18 17:13:04,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:04,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694296893] [2020-08-18 17:13:04,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:04,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:06,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:06,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:06,402 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:13:06,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1694296893] [2020-08-18 17:13:06,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:06,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-18 17:13:06,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874855154] [2020-08-18 17:13:06,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-18 17:13:06,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:06,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-18 17:13:06,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-18 17:13:06,404 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-18 17:13:06,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:06,744 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-18 17:13:06,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-18 17:13:06,745 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-18 17:13:06,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:06,747 INFO L225 Difference]: With dead ends: 122 [2020-08-18 17:13:06,747 INFO L226 Difference]: Without dead ends: 116 [2020-08-18 17:13:06,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-18 17:13:06,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-18 17:13:06,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-18 17:13:06,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-18 17:13:06,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-18 17:13:06,752 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-18 17:13:06,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:06,752 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-18 17:13:06,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-18 17:13:06,752 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-18 17:13:06,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-18 17:13:06,753 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:06,753 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:06,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-18 17:13:06,754 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:06,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:06,754 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-18 17:13:06,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:06,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1903599201] [2020-08-18 17:13:06,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:06,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:08,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:08,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:08,338 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:13:08,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1903599201] [2020-08-18 17:13:08,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:08,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-18 17:13:08,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518353592] [2020-08-18 17:13:08,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-18 17:13:08,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:08,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-18 17:13:08,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-18 17:13:08,340 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-18 17:13:08,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:08,682 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-18 17:13:08,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-18 17:13:08,683 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-18 17:13:08,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:08,685 INFO L225 Difference]: With dead ends: 124 [2020-08-18 17:13:08,686 INFO L226 Difference]: Without dead ends: 118 [2020-08-18 17:13:08,686 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-18 17:13:08,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-18 17:13:08,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-18 17:13:08,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-18 17:13:08,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-18 17:13:08,690 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-18 17:13:08,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:08,690 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-18 17:13:08,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-18 17:13:08,690 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-18 17:13:08,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-18 17:13:08,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:08,691 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:08,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-18 17:13:08,692 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:08,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:08,692 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-18 17:13:08,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:08,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437045558] [2020-08-18 17:13:08,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:08,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:10,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:10,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:10,279 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:13:10,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437045558] [2020-08-18 17:13:10,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:10,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-18 17:13:10,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233748154] [2020-08-18 17:13:10,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-18 17:13:10,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:10,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-18 17:13:10,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-18 17:13:10,281 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-18 17:13:10,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:10,660 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-18 17:13:10,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-18 17:13:10,661 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-18 17:13:10,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:10,662 INFO L225 Difference]: With dead ends: 126 [2020-08-18 17:13:10,662 INFO L226 Difference]: Without dead ends: 120 [2020-08-18 17:13:10,663 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-18 17:13:10,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-18 17:13:10,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-18 17:13:10,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-18 17:13:10,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-18 17:13:10,667 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-18 17:13:10,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:10,667 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-18 17:13:10,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-18 17:13:10,667 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-18 17:13:10,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-18 17:13:10,668 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:10,668 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:10,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-18 17:13:10,669 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:10,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:10,669 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-18 17:13:10,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:10,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853747940] [2020-08-18 17:13:10,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:10,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:12,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:12,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:12,394 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:13:12,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853747940] [2020-08-18 17:13:12,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:12,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-18 17:13:12,395 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951542549] [2020-08-18 17:13:12,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-18 17:13:12,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:12,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-18 17:13:12,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-18 17:13:12,397 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-18 17:13:12,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:12,692 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-18 17:13:12,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-18 17:13:12,693 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-18 17:13:12,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:12,695 INFO L225 Difference]: With dead ends: 128 [2020-08-18 17:13:12,695 INFO L226 Difference]: Without dead ends: 122 [2020-08-18 17:13:12,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-18 17:13:12,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-18 17:13:12,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-18 17:13:12,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-18 17:13:12,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-18 17:13:12,700 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-18 17:13:12,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:12,700 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-18 17:13:12,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-18 17:13:12,700 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-18 17:13:12,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-18 17:13:12,701 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:12,701 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:12,701 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-18 17:13:12,701 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:12,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:12,702 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-18 17:13:12,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:12,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [394666802] [2020-08-18 17:13:12,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:12,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:14,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:14,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:14,499 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:13:14,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [394666802] [2020-08-18 17:13:14,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:14,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-18 17:13:14,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374180022] [2020-08-18 17:13:14,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-18 17:13:14,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:14,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-18 17:13:14,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-18 17:13:14,501 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-18 17:13:14,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:14,885 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-18 17:13:14,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-18 17:13:14,885 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-18 17:13:14,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:14,887 INFO L225 Difference]: With dead ends: 130 [2020-08-18 17:13:14,887 INFO L226 Difference]: Without dead ends: 124 [2020-08-18 17:13:14,888 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-18 17:13:14,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-18 17:13:14,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-18 17:13:14,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-18 17:13:14,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-18 17:13:14,891 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-18 17:13:14,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:14,892 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-18 17:13:14,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-18 17:13:14,892 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-18 17:13:14,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-18 17:13:14,893 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:14,893 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:14,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-18 17:13:14,893 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:14,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:14,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-18 17:13:14,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:14,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291482114] [2020-08-18 17:13:14,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:14,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:16,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:16,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:16,771 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:13:16,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291482114] [2020-08-18 17:13:16,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:16,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-18 17:13:16,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525161388] [2020-08-18 17:13:16,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-18 17:13:16,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:16,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-18 17:13:16,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-18 17:13:16,774 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-18 17:13:17,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:17,013 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-18 17:13:17,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-18 17:13:17,014 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-18 17:13:17,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:17,016 INFO L225 Difference]: With dead ends: 132 [2020-08-18 17:13:17,016 INFO L226 Difference]: Without dead ends: 126 [2020-08-18 17:13:17,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-18 17:13:17,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-18 17:13:17,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-18 17:13:17,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-18 17:13:17,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-18 17:13:17,021 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-18 17:13:17,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:17,021 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-18 17:13:17,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-18 17:13:17,021 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-18 17:13:17,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-18 17:13:17,022 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:17,022 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:17,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-18 17:13:17,023 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:17,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:17,023 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-18 17:13:17,023 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:17,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [882324255] [2020-08-18 17:13:17,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:17,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:18,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:18,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:18,974 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:13:18,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [882324255] [2020-08-18 17:13:18,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:18,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-18 17:13:18,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958505287] [2020-08-18 17:13:18,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-18 17:13:18,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:18,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-18 17:13:18,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-18 17:13:18,976 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-18 17:13:19,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:19,367 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-18 17:13:19,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-18 17:13:19,367 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-18 17:13:19,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:19,369 INFO L225 Difference]: With dead ends: 134 [2020-08-18 17:13:19,369 INFO L226 Difference]: Without dead ends: 128 [2020-08-18 17:13:19,370 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-18 17:13:19,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-18 17:13:19,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-18 17:13:19,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-18 17:13:19,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-18 17:13:19,374 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-18 17:13:19,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:19,374 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-18 17:13:19,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-18 17:13:19,375 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-18 17:13:19,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-18 17:13:19,375 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:19,375 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:19,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-18 17:13:19,376 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:19,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:19,376 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-18 17:13:19,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:19,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [24402412] [2020-08-18 17:13:19,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:19,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:21,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:21,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:21,436 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 17:13:21,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [24402412] [2020-08-18 17:13:21,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:21,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-18 17:13:21,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027534263] [2020-08-18 17:13:21,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-18 17:13:21,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:21,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-18 17:13:21,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-18 17:13:21,438 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-18 17:13:21,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:21,713 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-18 17:13:21,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-18 17:13:21,714 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-18 17:13:21,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:21,715 INFO L225 Difference]: With dead ends: 136 [2020-08-18 17:13:21,715 INFO L226 Difference]: Without dead ends: 130 [2020-08-18 17:13:21,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-18 17:13:21,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-18 17:13:21,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-18 17:13:21,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-18 17:13:21,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-18 17:13:21,720 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-18 17:13:21,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:21,720 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-18 17:13:21,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-18 17:13:21,720 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-18 17:13:21,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-18 17:13:21,721 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:21,721 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:13:21,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-18 17:13:21,721 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:21,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:21,722 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-18 17:13:21,722 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:21,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901821156] [2020-08-18 17:13:21,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:21,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat