/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=SHALLOWEST -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 20:25:38,241 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:25:38,244 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:25:38,284 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:25:38,284 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:25:38,296 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:25:38,298 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:25:38,299 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:25:38,300 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:25:38,301 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:25:38,302 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:25:38,303 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:25:38,303 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:25:38,304 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:25:38,305 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:25:38,306 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:25:38,307 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:25:38,308 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:25:38,309 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:25:38,311 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:25:38,312 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:25:38,313 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:25:38,314 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:25:38,315 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:25:38,318 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 20:25:38,325 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:25:38,325 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:25:38,326 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:25:38,327 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 20:25:38,348 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:25:38,348 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:25:38,349 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:25:38,350 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:25:38,350 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:25:38,350 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:25:38,350 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:25:38,351 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:25:38,351 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:25:38,351 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:25:38,351 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:25:38,351 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:25:38,352 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:25:38,352 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:25:38,352 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:25:38,352 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:25:38,352 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:25:38,353 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:25:38,353 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:25:38,353 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:25:38,353 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:25:38,353 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:25:38,354 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:25:38,354 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:25:38,354 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:25:38,354 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:25:38,355 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:25:38,355 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:25:38,355 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:25:38,355 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=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:25:38,627 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:25:38,650 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:25:38,655 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:25:38,657 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:25:38,657 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:25:38,658 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-18 20:25:38,729 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/15a6f71fa/281e99e3c7654af7a09874db0635fe83/FLAGf6344dfad [2020-08-18 20:25:39,162 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:25:39,162 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-18 20:25:39,168 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/15a6f71fa/281e99e3c7654af7a09874db0635fe83/FLAGf6344dfad [2020-08-18 20:25:39,528 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/15a6f71fa/281e99e3c7654af7a09874db0635fe83 [2020-08-18 20:25:39,537 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:25:39,539 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:25:39,540 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:25:39,540 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:25:39,543 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:25:39,544 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:25:39" (1/1) ... [2020-08-18 20:25:39,547 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17ea2dc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:39, skipping insertion in model container [2020-08-18 20:25:39,547 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:25:39" (1/1) ... [2020-08-18 20:25:39,554 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:25:39,571 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:25:39,729 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:25:39,733 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:25:39,752 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:25:39,772 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:25:39,772 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:39 WrapperNode [2020-08-18 20:25:39,773 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:25:39,773 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:25:39,773 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:25:39,774 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:25:39,866 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:39" (1/1) ... [2020-08-18 20:25:39,866 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:39" (1/1) ... [2020-08-18 20:25:39,874 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:39" (1/1) ... [2020-08-18 20:25:39,875 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:39" (1/1) ... [2020-08-18 20:25:39,880 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:39" (1/1) ... [2020-08-18 20:25:39,891 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:39" (1/1) ... [2020-08-18 20:25:39,891 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:39" (1/1) ... [2020-08-18 20:25:39,893 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:25:39,894 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:25:39,894 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:25:39,894 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:25:39,895 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:39" (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 20:25:39,949 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:25:39,950 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:25:39,950 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 20:25:39,950 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:25:39,950 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:25:39,950 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 20:25:39,950 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:25:39,951 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 20:25:39,951 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 20:25:39,951 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 20:25:39,951 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 20:25:39,951 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:25:39,951 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:25:40,145 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:25:40,145 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 20:25:40,149 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:25:40 BoogieIcfgContainer [2020-08-18 20:25:40,149 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:25:40,150 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:25:40,150 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:25:40,155 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:25:40,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:25:39" (1/3) ... [2020-08-18 20:25:40,159 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79cab64d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:25:40, skipping insertion in model container [2020-08-18 20:25:40,159 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:25:39" (2/3) ... [2020-08-18 20:25:40,159 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79cab64d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:25:40, skipping insertion in model container [2020-08-18 20:25:40,160 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:25:40" (3/3) ... [2020-08-18 20:25:40,167 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-18 20:25:40,182 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:25:40,189 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:25:40,221 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:25:40,279 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:25:40,279 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:25:40,279 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:25:40,279 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:25:40,280 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:25:40,280 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:25:40,280 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:25:40,280 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:25:40,298 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-18 20:25:40,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 20:25:40,305 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:40,306 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:40,307 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:40,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:40,311 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-18 20:25:40,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:40,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [441555194] [2020-08-18 20:25:40,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:40,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:40,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:40,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:40,475 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 20:25:40,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [441555194] [2020-08-18 20:25:40,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:25:40,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 20:25:40,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78483887] [2020-08-18 20:25:40,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 20:25:40,488 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:40,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 20:25:40,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:25:40,507 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-18 20:25:40,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:40,576 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-18 20:25:40,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 20:25:40,578 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-18 20:25:40,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:40,587 INFO L225 Difference]: With dead ends: 34 [2020-08-18 20:25:40,587 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 20:25:40,592 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 20:25:40,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 20:25:40,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 20:25:40,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 20:25:40,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 20:25:40,633 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 20:25:40,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:40,634 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 20:25:40,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 20:25:40,635 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 20:25:40,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 20:25:40,635 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:40,636 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:40,636 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:25:40,636 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:40,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:40,637 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-18 20:25:40,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:40,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [338747716] [2020-08-18 20:25:40,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:40,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:40,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:40,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:40,710 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 20:25:40,711 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [338747716] [2020-08-18 20:25:40,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:25:40,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 20:25:40,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138261140] [2020-08-18 20:25:40,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:25:40,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:40,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:25:40,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:25:40,715 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-18 20:25:40,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:40,762 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 20:25:40,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:25:40,763 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 20:25:40,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:40,764 INFO L225 Difference]: With dead ends: 22 [2020-08-18 20:25:40,764 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 20:25:40,765 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 20:25:40,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 20:25:40,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-18 20:25:40,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 20:25:40,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 20:25:40,772 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-18 20:25:40,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:40,772 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 20:25:40,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:25:40,772 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 20:25:40,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 20:25:40,773 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:40,773 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:40,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:25:40,774 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:40,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:40,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-18 20:25:40,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:40,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1405507651] [2020-08-18 20:25:40,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:40,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:40,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:40,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:40,858 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 20:25:40,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1405507651] [2020-08-18 20:25:40,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:40,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 20:25:40,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342383530] [2020-08-18 20:25:40,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:25:40,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:40,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:25:40,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:25:40,861 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-18 20:25:40,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:40,912 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 20:25:40,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:25:40,913 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-18 20:25:40,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:40,914 INFO L225 Difference]: With dead ends: 24 [2020-08-18 20:25:40,914 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 20:25:40,915 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 20:25:40,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 20:25:40,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-18 20:25:40,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 20:25:40,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 20:25:40,920 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-18 20:25:40,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:40,921 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 20:25:40,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:25:40,921 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 20:25:40,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 20:25:40,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:40,922 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:40,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:25:40,923 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:40,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:40,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-18 20:25:40,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:40,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [55547306] [2020-08-18 20:25:40,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:40,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:41,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,014 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 20:25:41,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [55547306] [2020-08-18 20:25:41,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:41,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 20:25:41,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644400065] [2020-08-18 20:25:41,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:25:41,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:41,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:25:41,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:25:41,017 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-18 20:25:41,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:41,062 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 20:25:41,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:25:41,063 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-18 20:25:41,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:41,064 INFO L225 Difference]: With dead ends: 26 [2020-08-18 20:25:41,064 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 20:25:41,065 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 20:25:41,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 20:25:41,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-18 20:25:41,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 20:25:41,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 20:25:41,070 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-18 20:25:41,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:41,071 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 20:25:41,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:25:41,071 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 20:25:41,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 20:25:41,072 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:41,072 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:41,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 20:25:41,073 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:41,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:41,073 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-18 20:25:41,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:41,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96195937] [2020-08-18 20:25:41,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:41,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:41,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,166 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 20:25:41,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96195937] [2020-08-18 20:25:41,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:41,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 20:25:41,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442900393] [2020-08-18 20:25:41,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 20:25:41,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:41,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 20:25:41,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:25:41,171 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-18 20:25:41,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:41,227 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 20:25:41,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 20:25:41,227 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 20:25:41,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:41,228 INFO L225 Difference]: With dead ends: 28 [2020-08-18 20:25:41,228 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 20:25:41,229 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 20:25:41,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 20:25:41,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 20:25:41,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 20:25:41,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 20:25:41,235 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-18 20:25:41,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:41,236 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 20:25:41,236 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 20:25:41,236 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 20:25:41,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 20:25:41,237 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:41,237 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:41,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 20:25:41,238 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:41,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:41,238 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-18 20:25:41,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:41,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [134673884] [2020-08-18 20:25:41,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:41,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:41,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,341 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 20:25:41,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [134673884] [2020-08-18 20:25:41,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:41,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 20:25:41,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245788927] [2020-08-18 20:25:41,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 20:25:41,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:41,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 20:25:41,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:25:41,344 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-18 20:25:41,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:41,399 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 20:25:41,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 20:25:41,400 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-18 20:25:41,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:41,400 INFO L225 Difference]: With dead ends: 30 [2020-08-18 20:25:41,401 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 20:25:41,401 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 20:25:41,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 20:25:41,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 20:25:41,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 20:25:41,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 20:25:41,407 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-18 20:25:41,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:41,407 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 20:25:41,408 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 20:25:41,408 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 20:25:41,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 20:25:41,408 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:41,409 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:41,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 20:25:41,409 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:41,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:41,409 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-18 20:25:41,410 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:41,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1674473940] [2020-08-18 20:25:41,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:41,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:41,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,497 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 20:25:41,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1674473940] [2020-08-18 20:25:41,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:41,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:25:41,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694242370] [2020-08-18 20:25:41,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:25:41,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:41,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:25:41,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:25:41,500 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-18 20:25:41,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:41,562 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 20:25:41,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 20:25:41,563 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-18 20:25:41,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:41,564 INFO L225 Difference]: With dead ends: 32 [2020-08-18 20:25:41,564 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 20:25:41,564 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 20:25:41,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 20:25:41,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 20:25:41,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 20:25:41,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 20:25:41,570 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-18 20:25:41,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:41,570 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 20:25:41,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:25:41,571 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 20:25:41,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 20:25:41,571 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:41,572 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:41,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 20:25:41,572 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:41,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:41,572 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-18 20:25:41,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:41,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [61491716] [2020-08-18 20:25:41,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:41,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:41,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,672 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 20:25:41,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [61491716] [2020-08-18 20:25:41,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:41,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 20:25:41,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508104382] [2020-08-18 20:25:41,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 20:25:41,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:41,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 20:25:41,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:25:41,674 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-18 20:25:41,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:41,737 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 20:25:41,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:25:41,737 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-18 20:25:41,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:41,738 INFO L225 Difference]: With dead ends: 34 [2020-08-18 20:25:41,738 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 20:25:41,739 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 20:25:41,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 20:25:41,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 20:25:41,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 20:25:41,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 20:25:41,745 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-18 20:25:41,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:41,746 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 20:25:41,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 20:25:41,746 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 20:25:41,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 20:25:41,747 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:41,747 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:41,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 20:25:41,747 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:41,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:41,748 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-18 20:25:41,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:41,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441243985] [2020-08-18 20:25:41,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:41,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:41,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:41,841 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 20:25:41,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1441243985] [2020-08-18 20:25:41,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:41,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 20:25:41,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082849229] [2020-08-18 20:25:41,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 20:25:41,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:41,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 20:25:41,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:25:41,843 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-18 20:25:41,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:41,905 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 20:25:41,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 20:25:41,905 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-18 20:25:41,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:41,906 INFO L225 Difference]: With dead ends: 36 [2020-08-18 20:25:41,906 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 20:25:41,907 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 20:25:41,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 20:25:41,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 20:25:41,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 20:25:41,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 20:25:41,912 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-18 20:25:41,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:41,912 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 20:25:41,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 20:25:41,912 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 20:25:41,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 20:25:41,913 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:41,913 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:41,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 20:25:41,914 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:41,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:41,914 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-18 20:25:41,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:41,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1178746190] [2020-08-18 20:25:41,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:41,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:42,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,037 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 20:25:42,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1178746190] [2020-08-18 20:25:42,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:42,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 20:25:42,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291396155] [2020-08-18 20:25:42,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 20:25:42,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:42,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 20:25:42,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:25:42,040 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-18 20:25:42,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:42,113 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 20:25:42,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 20:25:42,114 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-18 20:25:42,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:42,114 INFO L225 Difference]: With dead ends: 38 [2020-08-18 20:25:42,115 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 20:25:42,115 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 20:25:42,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 20:25:42,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 20:25:42,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 20:25:42,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 20:25:42,120 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-18 20:25:42,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:42,121 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 20:25:42,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 20:25:42,121 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 20:25:42,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 20:25:42,122 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:42,122 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:42,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 20:25:42,123 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:42,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:42,123 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-18 20:25:42,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:42,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690015553] [2020-08-18 20:25:42,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:42,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:42,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,259 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 20:25:42,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690015553] [2020-08-18 20:25:42,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:42,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:25:42,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214604217] [2020-08-18 20:25:42,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:25:42,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:42,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:25:42,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:25:42,262 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-18 20:25:42,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:42,326 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 20:25:42,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 20:25:42,327 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-18 20:25:42,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:42,329 INFO L225 Difference]: With dead ends: 40 [2020-08-18 20:25:42,329 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 20:25:42,330 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 20:25:42,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 20:25:42,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 20:25:42,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 20:25:42,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 20:25:42,335 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-18 20:25:42,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:42,335 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 20:25:42,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:25:42,337 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 20:25:42,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 20:25:42,340 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:42,340 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:42,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 20:25:42,340 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:42,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:42,342 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-18 20:25:42,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:42,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989967556] [2020-08-18 20:25:42,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:42,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:42,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,509 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 20:25:42,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989967556] [2020-08-18 20:25:42,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:42,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 20:25:42,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266997710] [2020-08-18 20:25:42,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 20:25:42,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:42,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 20:25:42,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 20:25:42,512 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-18 20:25:42,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:42,575 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 20:25:42,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 20:25:42,576 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-18 20:25:42,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:42,577 INFO L225 Difference]: With dead ends: 42 [2020-08-18 20:25:42,577 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 20:25:42,577 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 20:25:42,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 20:25:42,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 20:25:42,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 20:25:42,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 20:25:42,582 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-18 20:25:42,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:42,582 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 20:25:42,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 20:25:42,583 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 20:25:42,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 20:25:42,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:42,584 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:42,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 20:25:42,584 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:42,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:42,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-18 20:25:42,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:42,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408822773] [2020-08-18 20:25:42,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:42,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:42,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,730 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 20:25:42,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [408822773] [2020-08-18 20:25:42,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:42,731 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 20:25:42,731 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103349355] [2020-08-18 20:25:42,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 20:25:42,732 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:42,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 20:25:42,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:25:42,733 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-18 20:25:42,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:42,806 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 20:25:42,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 20:25:42,807 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-18 20:25:42,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:42,808 INFO L225 Difference]: With dead ends: 44 [2020-08-18 20:25:42,808 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 20:25:42,808 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 20:25:42,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 20:25:42,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 20:25:42,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 20:25:42,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 20:25:42,813 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-18 20:25:42,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:42,813 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 20:25:42,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 20:25:42,813 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 20:25:42,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 20:25:42,814 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:42,814 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:42,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 20:25:42,815 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:42,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:42,815 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-18 20:25:42,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:42,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [50060275] [2020-08-18 20:25:42,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:42,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:42,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,988 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 20:25:42,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [50060275] [2020-08-18 20:25:42,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:42,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 20:25:42,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238153016] [2020-08-18 20:25:42,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 20:25:42,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:42,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 20:25:42,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:25:42,991 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-18 20:25:43,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:43,060 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 20:25:43,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 20:25:43,060 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-18 20:25:43,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:43,061 INFO L225 Difference]: With dead ends: 46 [2020-08-18 20:25:43,061 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 20:25:43,062 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 20:25:43,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 20:25:43,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 20:25:43,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 20:25:43,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 20:25:43,066 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-18 20:25:43,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:43,067 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 20:25:43,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 20:25:43,067 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 20:25:43,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 20:25:43,068 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:43,068 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:43,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 20:25:43,068 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:43,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:43,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-18 20:25:43,069 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:43,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443171929] [2020-08-18 20:25:43,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:43,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:43,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,243 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 20:25:43,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443171929] [2020-08-18 20:25:43,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:43,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 20:25:43,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538530445] [2020-08-18 20:25:43,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 20:25:43,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:43,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 20:25:43,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:25:43,247 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-18 20:25:43,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:43,325 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 20:25:43,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 20:25:43,326 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-18 20:25:43,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:43,327 INFO L225 Difference]: With dead ends: 48 [2020-08-18 20:25:43,327 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 20:25:43,327 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 20:25:43,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 20:25:43,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 20:25:43,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 20:25:43,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 20:25:43,332 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-18 20:25:43,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:43,332 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 20:25:43,332 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 20:25:43,332 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 20:25:43,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 20:25:43,333 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:43,333 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:43,333 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 20:25:43,333 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:43,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:43,334 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-18 20:25:43,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:43,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224189367] [2020-08-18 20:25:43,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:43,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:43,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,495 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 20:25:43,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224189367] [2020-08-18 20:25:43,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:43,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 20:25:43,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841265701] [2020-08-18 20:25:43,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 20:25:43,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:43,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 20:25:43,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-18 20:25:43,498 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-18 20:25:43,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:43,586 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 20:25:43,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 20:25:43,587 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-18 20:25:43,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:43,588 INFO L225 Difference]: With dead ends: 50 [2020-08-18 20:25:43,588 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 20:25:43,589 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 20:25:43,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 20:25:43,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 20:25:43,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 20:25:43,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 20:25:43,594 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-18 20:25:43,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:43,594 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 20:25:43,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 20:25:43,594 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 20:25:43,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 20:25:43,595 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:43,595 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:43,595 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 20:25:43,596 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:43,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:43,596 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-18 20:25:43,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:43,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462048201] [2020-08-18 20:25:43,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:43,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:43,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,800 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 20:25:43,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462048201] [2020-08-18 20:25:43,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:43,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 20:25:43,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154242465] [2020-08-18 20:25:43,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 20:25:43,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:43,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 20:25:43,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-18 20:25:43,804 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-18 20:25:43,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:43,910 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 20:25:43,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 20:25:43,911 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-18 20:25:43,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:43,912 INFO L225 Difference]: With dead ends: 52 [2020-08-18 20:25:43,912 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 20:25:43,912 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 20:25:43,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 20:25:43,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 20:25:43,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 20:25:43,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 20:25:43,917 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-18 20:25:43,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:43,918 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 20:25:43,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 20:25:43,918 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 20:25:43,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 20:25:43,918 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:43,918 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:43,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 20:25:43,919 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:43,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:43,919 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-18 20:25:43,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:43,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339071603] [2020-08-18 20:25:43,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:43,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:44,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,112 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 20:25:44,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339071603] [2020-08-18 20:25:44,113 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:44,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 20:25:44,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392550553] [2020-08-18 20:25:44,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 20:25:44,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:44,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 20:25:44,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-18 20:25:44,114 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-18 20:25:44,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:44,202 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 20:25:44,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 20:25:44,202 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-18 20:25:44,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:44,203 INFO L225 Difference]: With dead ends: 54 [2020-08-18 20:25:44,203 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 20:25:44,204 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 20:25:44,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 20:25:44,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-18 20:25:44,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 20:25:44,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 20:25:44,209 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-18 20:25:44,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:44,209 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 20:25:44,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 20:25:44,209 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 20:25:44,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 20:25:44,210 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:44,210 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:44,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 20:25:44,210 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:44,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:44,211 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-18 20:25:44,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:44,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359139076] [2020-08-18 20:25:44,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:44,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:44,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,477 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 20:25:44,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359139076] [2020-08-18 20:25:44,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:44,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 20:25:44,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696337000] [2020-08-18 20:25:44,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 20:25:44,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:44,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 20:25:44,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:25:44,480 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-18 20:25:44,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:44,564 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 20:25:44,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 20:25:44,564 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-18 20:25:44,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:44,565 INFO L225 Difference]: With dead ends: 56 [2020-08-18 20:25:44,565 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 20:25:44,566 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 20:25:44,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 20:25:44,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-18 20:25:44,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 20:25:44,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 20:25:44,574 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-18 20:25:44,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:44,574 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 20:25:44,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 20:25:44,574 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 20:25:44,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 20:25:44,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:44,576 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:44,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 20:25:44,577 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:44,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:44,577 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-18 20:25:44,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:44,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1194607935] [2020-08-18 20:25:44,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:44,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:44,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:44,865 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 20:25:44,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1194607935] [2020-08-18 20:25:44,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:44,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 20:25:44,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373992525] [2020-08-18 20:25:44,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 20:25:44,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:44,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 20:25:44,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-18 20:25:44,870 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-18 20:25:44,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:44,939 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 20:25:44,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 20:25:44,939 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-18 20:25:44,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:44,940 INFO L225 Difference]: With dead ends: 58 [2020-08-18 20:25:44,940 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 20:25:44,941 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 20:25:44,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 20:25:44,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 20:25:44,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 20:25:44,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 20:25:44,950 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-18 20:25:44,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:44,951 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 20:25:44,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 20:25:44,951 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 20:25:44,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 20:25:44,954 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:44,954 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:44,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 20:25:44,955 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:44,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:44,955 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-18 20:25:44,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:44,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1652616655] [2020-08-18 20:25:44,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:44,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:45,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:45,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:45,278 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 20:25:45,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1652616655] [2020-08-18 20:25:45,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:45,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 20:25:45,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663427092] [2020-08-18 20:25:45,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 20:25:45,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:45,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 20:25:45,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-18 20:25:45,282 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-18 20:25:45,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:45,413 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 20:25:45,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 20:25:45,413 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-18 20:25:45,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:45,414 INFO L225 Difference]: With dead ends: 60 [2020-08-18 20:25:45,414 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 20:25:45,415 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 20:25:45,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 20:25:45,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 20:25:45,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 20:25:45,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 20:25:45,422 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-18 20:25:45,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:45,423 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 20:25:45,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 20:25:45,423 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 20:25:45,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 20:25:45,424 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:45,424 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:45,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 20:25:45,424 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:45,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:45,424 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-18 20:25:45,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:45,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [129090751] [2020-08-18 20:25:45,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:45,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:45,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:45,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:45,735 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 20:25:45,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [129090751] [2020-08-18 20:25:45,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:45,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 20:25:45,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289500455] [2020-08-18 20:25:45,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 20:25:45,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:45,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 20:25:45,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:25:45,738 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-18 20:25:45,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:45,826 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 20:25:45,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 20:25:45,828 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-18 20:25:45,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:45,829 INFO L225 Difference]: With dead ends: 62 [2020-08-18 20:25:45,829 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 20:25:45,830 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 20:25:45,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 20:25:45,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 20:25:45,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 20:25:45,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 20:25:45,837 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-18 20:25:45,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:45,837 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 20:25:45,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 20:25:45,837 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 20:25:45,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 20:25:45,841 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:45,841 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:45,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 20:25:45,841 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:45,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:45,841 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-18 20:25:45,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:45,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654728792] [2020-08-18 20:25:45,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:45,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:46,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:46,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:46,147 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 20:25:46,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654728792] [2020-08-18 20:25:46,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:46,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 20:25:46,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540870883] [2020-08-18 20:25:46,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 20:25:46,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:46,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 20:25:46,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:25:46,149 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-18 20:25:46,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:46,275 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 20:25:46,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 20:25:46,275 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-18 20:25:46,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:46,276 INFO L225 Difference]: With dead ends: 64 [2020-08-18 20:25:46,276 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 20:25:46,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:25:46,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 20:25:46,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 20:25:46,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 20:25:46,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 20:25:46,281 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-18 20:25:46,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:46,281 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 20:25:46,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 20:25:46,282 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 20:25:46,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 20:25:46,282 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:46,283 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:46,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 20:25:46,283 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:46,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:46,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-18 20:25:46,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:46,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94769573] [2020-08-18 20:25:46,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:46,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:46,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:46,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:46,626 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 20:25:46,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94769573] [2020-08-18 20:25:46,626 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:46,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 20:25:46,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5842727] [2020-08-18 20:25:46,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 20:25:46,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:46,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 20:25:46,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-18 20:25:46,628 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-18 20:25:46,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:46,757 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-18 20:25:46,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 20:25:46,757 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-18 20:25:46,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:46,758 INFO L225 Difference]: With dead ends: 66 [2020-08-18 20:25:46,759 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 20:25:46,759 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 20:25:46,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 20:25:46,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 20:25:46,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 20:25:46,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 20:25:46,763 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-18 20:25:46,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:46,763 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 20:25:46,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 20:25:46,763 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 20:25:46,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 20:25:46,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:46,764 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:46,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 20:25:46,765 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:46,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:46,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-18 20:25:46,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:46,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622406312] [2020-08-18 20:25:46,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:46,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:47,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,148 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 20:25:47,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622406312] [2020-08-18 20:25:47,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:47,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 20:25:47,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153180259] [2020-08-18 20:25:47,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 20:25:47,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:47,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 20:25:47,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-18 20:25:47,150 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-18 20:25:47,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:47,303 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-18 20:25:47,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 20:25:47,303 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-18 20:25:47,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:47,304 INFO L225 Difference]: With dead ends: 68 [2020-08-18 20:25:47,304 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 20:25:47,305 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 20:25:47,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 20:25:47,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 20:25:47,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 20:25:47,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-18 20:25:47,309 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-18 20:25:47,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:47,309 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-18 20:25:47,309 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 20:25:47,309 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-18 20:25:47,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 20:25:47,310 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:47,310 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:47,310 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 20:25:47,310 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:47,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:47,311 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-18 20:25:47,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:47,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1277194124] [2020-08-18 20:25:47,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:47,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:47,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:47,705 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 20:25:47,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1277194124] [2020-08-18 20:25:47,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:47,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 20:25:47,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902570320] [2020-08-18 20:25:47,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 20:25:47,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:47,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 20:25:47,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-18 20:25:47,707 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-18 20:25:47,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:47,878 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-18 20:25:47,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 20:25:47,878 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-18 20:25:47,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:47,879 INFO L225 Difference]: With dead ends: 70 [2020-08-18 20:25:47,879 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 20:25:47,880 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 20:25:47,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 20:25:47,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 20:25:47,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 20:25:47,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-18 20:25:47,886 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-18 20:25:47,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:47,886 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-18 20:25:47,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 20:25:47,889 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-18 20:25:47,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 20:25:47,889 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:47,889 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:47,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 20:25:47,890 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:47,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:47,890 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-18 20:25:47,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:47,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1141045798] [2020-08-18 20:25:47,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:47,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:48,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,363 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 20:25:48,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1141045798] [2020-08-18 20:25:48,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:48,364 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 20:25:48,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335424901] [2020-08-18 20:25:48,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 20:25:48,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:48,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 20:25:48,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:25:48,365 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-18 20:25:48,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:48,526 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-18 20:25:48,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 20:25:48,526 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-18 20:25:48,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:48,527 INFO L225 Difference]: With dead ends: 72 [2020-08-18 20:25:48,527 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 20:25:48,529 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:25:48,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 20:25:48,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 20:25:48,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 20:25:48,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-18 20:25:48,533 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-18 20:25:48,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:48,533 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-18 20:25:48,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 20:25:48,533 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-18 20:25:48,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 20:25:48,534 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:48,534 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:48,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 20:25:48,534 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:48,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:48,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-18 20:25:48,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:48,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178708372] [2020-08-18 20:25:48,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:48,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:48,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:48,960 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 20:25:48,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [178708372] [2020-08-18 20:25:48,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:48,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 20:25:48,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78061093] [2020-08-18 20:25:48,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 20:25:48,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:48,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 20:25:48,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-18 20:25:48,962 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-18 20:25:49,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:49,125 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-18 20:25:49,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 20:25:49,126 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-18 20:25:49,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:49,127 INFO L225 Difference]: With dead ends: 74 [2020-08-18 20:25:49,127 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 20:25:49,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-18 20:25:49,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 20:25:49,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 20:25:49,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 20:25:49,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-18 20:25:49,133 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-18 20:25:49,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:49,133 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-18 20:25:49,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 20:25:49,133 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-18 20:25:49,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 20:25:49,134 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:49,134 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:49,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 20:25:49,134 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:49,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:49,135 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-18 20:25:49,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:49,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [208500826] [2020-08-18 20:25:49,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:49,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:49,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:49,582 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 20:25:49,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [208500826] [2020-08-18 20:25:49,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:49,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 20:25:49,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185972748] [2020-08-18 20:25:49,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 20:25:49,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:49,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 20:25:49,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-18 20:25:49,585 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-18 20:25:49,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:49,764 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-18 20:25:49,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 20:25:49,765 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-18 20:25:49,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:49,766 INFO L225 Difference]: With dead ends: 76 [2020-08-18 20:25:49,766 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 20:25:49,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-18 20:25:49,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 20:25:49,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 20:25:49,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 20:25:49,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-18 20:25:49,772 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-18 20:25:49,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:49,773 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-18 20:25:49,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 20:25:49,773 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-18 20:25:49,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 20:25:49,774 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:49,774 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:49,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 20:25:49,775 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:49,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:49,775 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-18 20:25:49,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:49,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [25036417] [2020-08-18 20:25:49,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:49,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:50,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:50,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:50,253 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 20:25:50,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [25036417] [2020-08-18 20:25:50,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:50,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 20:25:50,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929479708] [2020-08-18 20:25:50,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 20:25:50,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:50,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 20:25:50,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-18 20:25:50,258 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-18 20:25:50,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:50,441 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-18 20:25:50,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 20:25:50,441 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-18 20:25:50,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:50,443 INFO L225 Difference]: With dead ends: 78 [2020-08-18 20:25:50,443 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 20:25:50,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-18 20:25:50,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 20:25:50,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 20:25:50,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 20:25:50,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-18 20:25:50,447 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-18 20:25:50,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:50,448 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-18 20:25:50,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 20:25:50,448 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-18 20:25:50,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 20:25:50,448 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:50,448 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:50,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 20:25:50,448 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:50,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:50,449 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-18 20:25:50,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:50,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1297090489] [2020-08-18 20:25:50,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:50,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:51,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:51,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:51,089 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 20:25:51,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1297090489] [2020-08-18 20:25:51,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:51,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 20:25:51,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972930273] [2020-08-18 20:25:51,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 20:25:51,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:51,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 20:25:51,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 20:25:51,092 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-18 20:25:51,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:51,301 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-18 20:25:51,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 20:25:51,301 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-18 20:25:51,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:51,302 INFO L225 Difference]: With dead ends: 80 [2020-08-18 20:25:51,303 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 20:25:51,304 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 20:25:51,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 20:25:51,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 20:25:51,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 20:25:51,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-18 20:25:51,309 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-18 20:25:51,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:51,309 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-18 20:25:51,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 20:25:51,310 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-18 20:25:51,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 20:25:51,314 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:51,314 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:51,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 20:25:51,315 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:51,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:51,316 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-18 20:25:51,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:51,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050852123] [2020-08-18 20:25:51,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:51,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:52,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:52,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:52,078 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 20:25:52,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050852123] [2020-08-18 20:25:52,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:52,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 20:25:52,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329677676] [2020-08-18 20:25:52,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 20:25:52,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:52,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 20:25:52,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 20:25:52,080 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-18 20:25:52,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:52,259 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-18 20:25:52,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 20:25:52,260 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-18 20:25:52,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:52,260 INFO L225 Difference]: With dead ends: 82 [2020-08-18 20:25:52,261 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 20:25:52,261 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 20:25:52,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 20:25:52,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 20:25:52,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 20:25:52,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-18 20:25:52,265 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-18 20:25:52,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:52,265 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-18 20:25:52,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 20:25:52,265 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-18 20:25:52,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 20:25:52,266 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:52,266 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:52,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 20:25:52,266 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:52,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:52,267 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-18 20:25:52,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:52,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104714790] [2020-08-18 20:25:52,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:52,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:53,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:53,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:53,028 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 20:25:53,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104714790] [2020-08-18 20:25:53,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:53,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 20:25:53,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405702098] [2020-08-18 20:25:53,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 20:25:53,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:53,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 20:25:53,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 20:25:53,031 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-18 20:25:53,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:53,226 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-18 20:25:53,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 20:25:53,227 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-18 20:25:53,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:53,228 INFO L225 Difference]: With dead ends: 84 [2020-08-18 20:25:53,228 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 20:25:53,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 20:25:53,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 20:25:53,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 20:25:53,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 20:25:53,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-18 20:25:53,234 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-18 20:25:53,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:53,234 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-18 20:25:53,235 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 20:25:53,235 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-18 20:25:53,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 20:25:53,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:53,236 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:53,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 20:25:53,236 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:53,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:53,236 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-18 20:25:53,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:53,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [9491901] [2020-08-18 20:25:53,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:53,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:53,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:53,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:53,898 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 20:25:53,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [9491901] [2020-08-18 20:25:53,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:53,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 20:25:53,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872950721] [2020-08-18 20:25:53,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 20:25:53,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:53,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 20:25:53,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 20:25:53,901 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-18 20:25:54,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:54,080 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-18 20:25:54,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 20:25:54,080 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-18 20:25:54,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:54,081 INFO L225 Difference]: With dead ends: 86 [2020-08-18 20:25:54,081 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 20:25:54,082 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 20:25:54,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 20:25:54,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 20:25:54,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 20:25:54,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-18 20:25:54,086 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-18 20:25:54,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:54,086 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-18 20:25:54,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 20:25:54,086 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-18 20:25:54,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 20:25:54,087 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:54,087 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:54,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 20:25:54,088 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:54,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:54,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-18 20:25:54,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:54,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960876168] [2020-08-18 20:25:54,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:54,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:54,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:54,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:54,807 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 20:25:54,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960876168] [2020-08-18 20:25:54,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:54,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 20:25:54,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291120432] [2020-08-18 20:25:54,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 20:25:54,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:54,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 20:25:54,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 20:25:54,809 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-18 20:25:54,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:54,989 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-18 20:25:54,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 20:25:54,990 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-18 20:25:54,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:54,991 INFO L225 Difference]: With dead ends: 88 [2020-08-18 20:25:54,991 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 20:25:54,992 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 20:25:54,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 20:25:54,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 20:25:54,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 20:25:54,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-18 20:25:54,995 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-18 20:25:54,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:54,995 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-18 20:25:54,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 20:25:54,995 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-18 20:25:54,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 20:25:54,996 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:54,996 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:54,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 20:25:54,997 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:54,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:54,997 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-18 20:25:54,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:54,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817057086] [2020-08-18 20:25:54,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:55,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:55,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:55,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:55,752 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 20:25:55,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817057086] [2020-08-18 20:25:55,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:55,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 20:25:55,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549238983] [2020-08-18 20:25:55,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 20:25:55,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:55,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 20:25:55,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 20:25:55,755 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-18 20:25:55,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:55,943 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-18 20:25:55,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 20:25:55,944 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-18 20:25:55,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:55,945 INFO L225 Difference]: With dead ends: 90 [2020-08-18 20:25:55,945 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 20:25:55,946 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 20:25:55,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 20:25:55,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 20:25:55,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 20:25:55,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-18 20:25:55,950 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-18 20:25:55,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:55,950 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-18 20:25:55,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 20:25:55,951 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-18 20:25:55,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 20:25:55,951 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:55,951 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:55,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 20:25:55,952 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:55,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:55,952 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-18 20:25:55,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:55,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1743247362] [2020-08-18 20:25:55,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:55,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:56,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:56,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:56,883 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 20:25:56,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1743247362] [2020-08-18 20:25:56,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:56,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 20:25:56,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049432894] [2020-08-18 20:25:56,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 20:25:56,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:56,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 20:25:56,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 20:25:56,886 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-18 20:25:57,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:57,014 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-18 20:25:57,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 20:25:57,014 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-18 20:25:57,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:57,016 INFO L225 Difference]: With dead ends: 92 [2020-08-18 20:25:57,016 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 20:25:57,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 20:25:57,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 20:25:57,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 20:25:57,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 20:25:57,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-18 20:25:57,021 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-18 20:25:57,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:57,021 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-18 20:25:57,022 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 20:25:57,022 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-18 20:25:57,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 20:25:57,022 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:57,023 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:57,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 20:25:57,023 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:57,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:57,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-18 20:25:57,023 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:57,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438282621] [2020-08-18 20:25:57,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:57,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:57,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:57,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:57,801 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 20:25:57,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438282621] [2020-08-18 20:25:57,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:57,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 20:25:57,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879779262] [2020-08-18 20:25:57,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 20:25:57,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:57,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 20:25:57,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 20:25:57,804 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-18 20:25:58,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:58,019 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-18 20:25:58,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 20:25:58,021 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-18 20:25:58,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:58,022 INFO L225 Difference]: With dead ends: 94 [2020-08-18 20:25:58,022 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 20:25:58,023 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 20:25:58,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 20:25:58,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 20:25:58,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 20:25:58,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-18 20:25:58,026 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-18 20:25:58,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:58,028 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-18 20:25:58,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 20:25:58,028 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-18 20:25:58,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 20:25:58,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:58,029 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:58,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 20:25:58,029 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:58,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:58,029 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-18 20:25:58,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:58,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049348407] [2020-08-18 20:25:58,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:58,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:58,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:58,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:58,903 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 20:25:58,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049348407] [2020-08-18 20:25:58,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:58,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 20:25:58,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595442716] [2020-08-18 20:25:58,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 20:25:58,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:58,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 20:25:58,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 20:25:58,905 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-18 20:25:59,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:59,152 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-18 20:25:59,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 20:25:59,153 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-18 20:25:59,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:59,153 INFO L225 Difference]: With dead ends: 96 [2020-08-18 20:25:59,154 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 20:25:59,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 20:25:59,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 20:25:59,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 20:25:59,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 20:25:59,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-18 20:25:59,158 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-18 20:25:59,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:59,158 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-18 20:25:59,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 20:25:59,158 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-18 20:25:59,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 20:25:59,159 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:59,159 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:59,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 20:25:59,160 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:59,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:59,160 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-18 20:25:59,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:59,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434873612] [2020-08-18 20:25:59,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:59,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:00,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:00,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:00,039 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 20:26:00,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434873612] [2020-08-18 20:26:00,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:00,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 20:26:00,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798092991] [2020-08-18 20:26:00,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 20:26:00,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:00,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 20:26:00,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 20:26:00,041 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-18 20:26:00,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:00,273 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-18 20:26:00,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 20:26:00,274 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-18 20:26:00,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:00,275 INFO L225 Difference]: With dead ends: 98 [2020-08-18 20:26:00,275 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 20:26:00,276 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 20:26:00,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 20:26:00,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 20:26:00,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 20:26:00,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-18 20:26:00,281 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-18 20:26:00,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:00,282 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-18 20:26:00,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 20:26:00,282 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-18 20:26:00,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 20:26:00,282 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:00,283 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:00,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 20:26:00,283 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:00,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:00,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-18 20:26:00,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:00,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [238022687] [2020-08-18 20:26:00,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:00,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:01,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:01,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:01,161 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 20:26:01,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [238022687] [2020-08-18 20:26:01,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:01,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 20:26:01,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754590231] [2020-08-18 20:26:01,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 20:26:01,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:01,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 20:26:01,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 20:26:01,163 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-18 20:26:01,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:01,398 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-18 20:26:01,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 20:26:01,398 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-18 20:26:01,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:01,399 INFO L225 Difference]: With dead ends: 100 [2020-08-18 20:26:01,400 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 20:26:01,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 20:26:01,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 20:26:01,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 20:26:01,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 20:26:01,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-18 20:26:01,406 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-18 20:26:01,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:01,406 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-18 20:26:01,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 20:26:01,406 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-18 20:26:01,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 20:26:01,407 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:01,407 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:01,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 20:26:01,408 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:01,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:01,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-18 20:26:01,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:01,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1561098274] [2020-08-18 20:26:01,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:01,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:02,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:02,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:02,367 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 20:26:02,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1561098274] [2020-08-18 20:26:02,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:02,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 20:26:02,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56027581] [2020-08-18 20:26:02,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 20:26:02,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:02,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 20:26:02,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 20:26:02,369 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-18 20:26:02,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:02,540 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-18 20:26:02,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 20:26:02,540 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-18 20:26:02,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:02,542 INFO L225 Difference]: With dead ends: 102 [2020-08-18 20:26:02,542 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 20:26:02,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 20:26:02,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 20:26:02,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 20:26:02,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 20:26:02,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-18 20:26:02,547 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-18 20:26:02,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:02,548 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-18 20:26:02,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 20:26:02,548 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-18 20:26:02,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 20:26:02,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:02,549 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:02,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 20:26:02,549 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:02,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:02,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-18 20:26:02,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:02,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891043729] [2020-08-18 20:26:02,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:02,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:03,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:03,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:03,549 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 20:26:03,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891043729] [2020-08-18 20:26:03,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:03,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 20:26:03,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391230591] [2020-08-18 20:26:03,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 20:26:03,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:03,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 20:26:03,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 20:26:03,552 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-18 20:26:03,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:03,804 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-18 20:26:03,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 20:26:03,804 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-18 20:26:03,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:03,806 INFO L225 Difference]: With dead ends: 104 [2020-08-18 20:26:03,806 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 20:26:03,807 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 20:26:03,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 20:26:03,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 20:26:03,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 20:26:03,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-18 20:26:03,811 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-18 20:26:03,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:03,812 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-18 20:26:03,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 20:26:03,812 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-18 20:26:03,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 20:26:03,812 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:03,813 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:03,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 20:26:03,813 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:03,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:03,813 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-18 20:26:03,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:03,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [232129920] [2020-08-18 20:26:03,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:03,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:04,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:04,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:04,879 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 20:26:04,879 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [232129920] [2020-08-18 20:26:04,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:04,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 20:26:04,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781590894] [2020-08-18 20:26:04,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 20:26:04,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:04,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 20:26:04,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 20:26:04,881 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-18 20:26:05,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:05,044 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-18 20:26:05,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 20:26:05,045 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-18 20:26:05,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:05,046 INFO L225 Difference]: With dead ends: 106 [2020-08-18 20:26:05,046 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 20:26:05,047 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 20:26:05,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 20:26:05,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 20:26:05,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 20:26:05,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-18 20:26:05,051 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-18 20:26:05,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:05,051 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-18 20:26:05,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 20:26:05,052 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-18 20:26:05,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 20:26:05,052 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:05,052 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:05,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 20:26:05,053 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:05,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:05,053 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-18 20:26:05,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:05,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [220038840] [2020-08-18 20:26:05,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:05,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:06,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:06,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:06,139 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 20:26:06,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [220038840] [2020-08-18 20:26:06,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:06,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 20:26:06,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964329474] [2020-08-18 20:26:06,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 20:26:06,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:06,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 20:26:06,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 20:26:06,141 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-18 20:26:06,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:06,407 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-18 20:26:06,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 20:26:06,408 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-18 20:26:06,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:06,409 INFO L225 Difference]: With dead ends: 108 [2020-08-18 20:26:06,409 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 20:26:06,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 20:26:06,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 20:26:06,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 20:26:06,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 20:26:06,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-18 20:26:06,418 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-18 20:26:06,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:06,418 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-18 20:26:06,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 20:26:06,419 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-18 20:26:06,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 20:26:06,420 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:06,420 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:06,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 20:26:06,421 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:06,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:06,421 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-18 20:26:06,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:06,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988167402] [2020-08-18 20:26:06,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:06,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:07,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:07,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:07,683 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 20:26:07,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1988167402] [2020-08-18 20:26:07,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:07,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 20:26:07,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660094277] [2020-08-18 20:26:07,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 20:26:07,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:07,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 20:26:07,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 20:26:07,685 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-18 20:26:07,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:07,894 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-18 20:26:07,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 20:26:07,894 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-18 20:26:07,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:07,896 INFO L225 Difference]: With dead ends: 110 [2020-08-18 20:26:07,896 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 20:26:07,896 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 20:26:07,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 20:26:07,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 20:26:07,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 20:26:07,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-18 20:26:07,901 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-18 20:26:07,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:07,901 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-18 20:26:07,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 20:26:07,901 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-18 20:26:07,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 20:26:07,902 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:07,902 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:07,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 20:26:07,902 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:07,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:07,903 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-18 20:26:07,903 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:07,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234285106] [2020-08-18 20:26:07,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:07,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:09,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:09,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:09,079 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 20:26:09,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234285106] [2020-08-18 20:26:09,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:09,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 20:26:09,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921044434] [2020-08-18 20:26:09,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 20:26:09,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:09,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 20:26:09,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 20:26:09,081 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-18 20:26:09,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:09,261 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-18 20:26:09,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 20:26:09,261 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-18 20:26:09,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:09,262 INFO L225 Difference]: With dead ends: 112 [2020-08-18 20:26:09,262 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 20:26:09,263 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 20:26:09,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 20:26:09,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 20:26:09,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 20:26:09,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-18 20:26:09,268 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-18 20:26:09,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:09,268 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-18 20:26:09,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 20:26:09,269 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-18 20:26:09,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-18 20:26:09,269 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:09,269 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:09,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 20:26:09,270 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:09,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:09,270 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-18 20:26:09,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:09,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930935584] [2020-08-18 20:26:09,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:09,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:10,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:10,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:10,491 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 20:26:10,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930935584] [2020-08-18 20:26:10,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:10,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 20:26:10,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522739171] [2020-08-18 20:26:10,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 20:26:10,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:10,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 20:26:10,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 20:26:10,493 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-18 20:26:10,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:10,661 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-18 20:26:10,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 20:26:10,662 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-18 20:26:10,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:10,663 INFO L225 Difference]: With dead ends: 114 [2020-08-18 20:26:10,663 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 20:26:10,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 20:26:10,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 20:26:10,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 20:26:10,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 20:26:10,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-18 20:26:10,668 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-18 20:26:10,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:10,668 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-18 20:26:10,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 20:26:10,668 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-18 20:26:10,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-18 20:26:10,669 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:10,669 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:10,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 20:26:10,669 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:10,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:10,670 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-18 20:26:10,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:10,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1208383045] [2020-08-18 20:26:10,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:10,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:11,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:11,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:11,940 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 20:26:11,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1208383045] [2020-08-18 20:26:11,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:11,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-18 20:26:11,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52406806] [2020-08-18 20:26:11,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-18 20:26:11,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:11,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-18 20:26:11,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-18 20:26:11,945 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-18 20:26:12,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:12,123 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-18 20:26:12,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-18 20:26:12,124 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-18 20:26:12,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:12,125 INFO L225 Difference]: With dead ends: 116 [2020-08-18 20:26:12,126 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 20:26:12,126 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 20:26:12,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 20:26:12,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-18 20:26:12,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 20:26:12,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-18 20:26:12,130 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-18 20:26:12,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:12,131 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-18 20:26:12,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-18 20:26:12,131 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-18 20:26:12,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-18 20:26:12,132 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:12,132 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:12,132 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-18 20:26:12,132 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:12,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:12,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-18 20:26:12,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:12,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506628194] [2020-08-18 20:26:12,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:12,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:13,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:13,522 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 20:26:13,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506628194] [2020-08-18 20:26:13,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:13,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-18 20:26:13,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524872583] [2020-08-18 20:26:13,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-18 20:26:13,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:13,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-18 20:26:13,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-18 20:26:13,524 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-18 20:26:13,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:13,733 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-18 20:26:13,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-18 20:26:13,734 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-18 20:26:13,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:13,735 INFO L225 Difference]: With dead ends: 118 [2020-08-18 20:26:13,735 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 20:26:13,736 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 20:26:13,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 20:26:13,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-18 20:26:13,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-18 20:26:13,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-18 20:26:13,740 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-18 20:26:13,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:13,740 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-18 20:26:13,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-18 20:26:13,741 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-18 20:26:13,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-18 20:26:13,741 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:13,741 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:13,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-18 20:26:13,741 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:13,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:13,742 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-18 20:26:13,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:13,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468179840] [2020-08-18 20:26:13,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:13,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:15,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:15,133 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 20:26:15,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468179840] [2020-08-18 20:26:15,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:15,133 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-18 20:26:15,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179355895] [2020-08-18 20:26:15,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-18 20:26:15,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:15,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-18 20:26:15,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-18 20:26:15,135 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-18 20:26:15,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:15,370 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-18 20:26:15,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-18 20:26:15,372 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-18 20:26:15,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:15,374 INFO L225 Difference]: With dead ends: 120 [2020-08-18 20:26:15,374 INFO L226 Difference]: Without dead ends: 114 [2020-08-18 20:26:15,374 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-18 20:26:15,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-18 20:26:15,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-18 20:26:15,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-18 20:26:15,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-18 20:26:15,378 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-18 20:26:15,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:15,378 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-18 20:26:15,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-18 20:26:15,379 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-18 20:26:15,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-18 20:26:15,379 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:15,379 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:15,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-18 20:26:15,380 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:15,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:15,380 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-18 20:26:15,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:15,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280069637] [2020-08-18 20:26:15,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:15,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:16,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:16,832 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 20:26:16,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280069637] [2020-08-18 20:26:16,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:16,832 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-18 20:26:16,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547764747] [2020-08-18 20:26:16,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-18 20:26:16,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:16,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-18 20:26:16,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-18 20:26:16,834 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-18 20:26:17,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:17,137 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-18 20:26:17,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-18 20:26:17,138 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-18 20:26:17,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:17,139 INFO L225 Difference]: With dead ends: 122 [2020-08-18 20:26:17,139 INFO L226 Difference]: Without dead ends: 116 [2020-08-18 20:26:17,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-18 20:26:17,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-18 20:26:17,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-18 20:26:17,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-18 20:26:17,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-18 20:26:17,145 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-18 20:26:17,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:17,145 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-18 20:26:17,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-18 20:26:17,145 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-18 20:26:17,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-18 20:26:17,146 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:17,146 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:17,147 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-18 20:26:17,147 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:17,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:17,147 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-18 20:26:17,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:17,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689575465] [2020-08-18 20:26:17,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:17,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:18,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:18,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:18,644 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 20:26:18,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689575465] [2020-08-18 20:26:18,644 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:18,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-18 20:26:18,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013894622] [2020-08-18 20:26:18,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-18 20:26:18,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:18,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-18 20:26:18,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-18 20:26:18,645 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-18 20:26:18,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:18,958 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-18 20:26:18,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-18 20:26:18,958 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-18 20:26:18,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:18,960 INFO L225 Difference]: With dead ends: 124 [2020-08-18 20:26:18,960 INFO L226 Difference]: Without dead ends: 118 [2020-08-18 20:26:18,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-18 20:26:18,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-18 20:26:18,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-18 20:26:18,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-18 20:26:18,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-18 20:26:18,966 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-18 20:26:18,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:18,966 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-18 20:26:18,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-18 20:26:18,966 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-18 20:26:18,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-18 20:26:18,967 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:18,967 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:18,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-18 20:26:18,968 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:18,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:18,968 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-18 20:26:18,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:18,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [547669453] [2020-08-18 20:26:18,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:18,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:20,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:20,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:20,582 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 20:26:20,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [547669453] [2020-08-18 20:26:20,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:20,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-18 20:26:20,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207433631] [2020-08-18 20:26:20,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-18 20:26:20,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:20,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-18 20:26:20,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-18 20:26:20,583 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-18 20:26:20,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:20,959 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-18 20:26:20,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-18 20:26:20,959 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-18 20:26:20,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:20,960 INFO L225 Difference]: With dead ends: 126 [2020-08-18 20:26:20,961 INFO L226 Difference]: Without dead ends: 120 [2020-08-18 20:26:20,961 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 20:26:20,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-18 20:26:20,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-18 20:26:20,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-18 20:26:20,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-18 20:26:20,966 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-18 20:26:20,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:20,966 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-18 20:26:20,967 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-18 20:26:20,967 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-18 20:26:20,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-18 20:26:20,967 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:20,967 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:20,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-18 20:26:20,968 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:20,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:20,968 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-18 20:26:20,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:20,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1910737501] [2020-08-18 20:26:20,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:20,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:22,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:22,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:22,594 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 20:26:22,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1910737501] [2020-08-18 20:26:22,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:22,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-18 20:26:22,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543087542] [2020-08-18 20:26:22,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-18 20:26:22,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:22,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-18 20:26:22,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-18 20:26:22,596 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-18 20:26:22,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:22,865 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-18 20:26:22,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-18 20:26:22,866 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-18 20:26:22,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:22,867 INFO L225 Difference]: With dead ends: 128 [2020-08-18 20:26:22,867 INFO L226 Difference]: Without dead ends: 122 [2020-08-18 20:26:22,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-18 20:26:22,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-18 20:26:22,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-18 20:26:22,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-18 20:26:22,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-18 20:26:22,873 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-18 20:26:22,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:22,873 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-18 20:26:22,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-18 20:26:22,873 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-18 20:26:22,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-18 20:26:22,874 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:22,874 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:22,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-18 20:26:22,874 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:22,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:22,875 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-18 20:26:22,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:22,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1553068532] [2020-08-18 20:26:22,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:22,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:24,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:24,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:24,710 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 20:26:24,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1553068532] [2020-08-18 20:26:24,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:24,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-18 20:26:24,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097906057] [2020-08-18 20:26:24,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-18 20:26:24,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:24,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-18 20:26:24,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-18 20:26:24,711 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-18 20:26:25,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:25,043 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-18 20:26:25,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-18 20:26:25,044 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-18 20:26:25,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:25,045 INFO L225 Difference]: With dead ends: 130 [2020-08-18 20:26:25,045 INFO L226 Difference]: Without dead ends: 124 [2020-08-18 20:26:25,046 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 20:26:25,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-18 20:26:25,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-18 20:26:25,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-18 20:26:25,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-18 20:26:25,050 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-18 20:26:25,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:25,051 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-18 20:26:25,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-18 20:26:25,051 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-18 20:26:25,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-18 20:26:25,052 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:25,052 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:25,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-18 20:26:25,052 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:25,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:25,052 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-18 20:26:25,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:25,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1794358580] [2020-08-18 20:26:25,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:25,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:26,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:26,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:26,773 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 20:26:26,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1794358580] [2020-08-18 20:26:26,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:26,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-18 20:26:26,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161971853] [2020-08-18 20:26:26,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-18 20:26:26,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:26,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-18 20:26:26,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-18 20:26:26,775 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-18 20:26:26,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:26,987 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-18 20:26:26,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-18 20:26:26,988 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-18 20:26:26,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:26,989 INFO L225 Difference]: With dead ends: 132 [2020-08-18 20:26:26,989 INFO L226 Difference]: Without dead ends: 126 [2020-08-18 20:26:26,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-18 20:26:26,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-18 20:26:26,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-18 20:26:26,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-18 20:26:26,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-18 20:26:26,994 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-18 20:26:26,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:26,995 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-18 20:26:26,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-18 20:26:26,995 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-18 20:26:26,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-18 20:26:26,996 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:26,996 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:26,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-18 20:26:26,996 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:26,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:26,996 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-18 20:26:26,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:26,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1485004806] [2020-08-18 20:26:26,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:27,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:28,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:28,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:28,734 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 20:26:28,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1485004806] [2020-08-18 20:26:28,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:28,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-18 20:26:28,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719104744] [2020-08-18 20:26:28,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-18 20:26:28,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:28,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-18 20:26:28,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-18 20:26:28,736 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-18 20:26:29,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:29,097 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-18 20:26:29,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-18 20:26:29,098 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-18 20:26:29,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:29,099 INFO L225 Difference]: With dead ends: 134 [2020-08-18 20:26:29,099 INFO L226 Difference]: Without dead ends: 128 [2020-08-18 20:26:29,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-18 20:26:29,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-18 20:26:29,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-18 20:26:29,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-18 20:26:29,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-18 20:26:29,105 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-18 20:26:29,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:29,105 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-18 20:26:29,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-18 20:26:29,105 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-18 20:26:29,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-18 20:26:29,106 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:29,106 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:29,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-18 20:26:29,106 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:29,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:29,107 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-18 20:26:29,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:29,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174668522] [2020-08-18 20:26:29,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:29,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:30,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:30,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:30,981 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 20:26:30,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174668522] [2020-08-18 20:26:30,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:30,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-18 20:26:30,981 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843748774] [2020-08-18 20:26:30,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-18 20:26:30,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:30,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-18 20:26:30,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-18 20:26:30,982 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-18 20:26:31,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:31,219 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-18 20:26:31,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-18 20:26:31,219 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-18 20:26:31,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:31,221 INFO L225 Difference]: With dead ends: 136 [2020-08-18 20:26:31,221 INFO L226 Difference]: Without dead ends: 130 [2020-08-18 20:26:31,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-18 20:26:31,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-18 20:26:31,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-18 20:26:31,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-18 20:26:31,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-18 20:26:31,224 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-18 20:26:31,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:31,225 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-18 20:26:31,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-18 20:26:31,225 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-18 20:26:31,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-18 20:26:31,226 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:31,226 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:31,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-18 20:26:31,226 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:31,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:31,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-18 20:26:31,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:31,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [337526058] [2020-08-18 20:26:31,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:31,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:33,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:33,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:33,167 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 0 proven. 3364 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:33,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [337526058] [2020-08-18 20:26:33,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:33,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-08-18 20:26:33,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442891695] [2020-08-18 20:26:33,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-08-18 20:26:33,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:33,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-08-18 20:26:33,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-18 20:26:33,168 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 62 states. [2020-08-18 20:26:33,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:33,518 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2020-08-18 20:26:33,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-08-18 20:26:33,519 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 128 [2020-08-18 20:26:33,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:33,520 INFO L225 Difference]: With dead ends: 138 [2020-08-18 20:26:33,520 INFO L226 Difference]: Without dead ends: 132 [2020-08-18 20:26:33,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-18 20:26:33,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-08-18 20:26:33,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2020-08-18 20:26:33,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-08-18 20:26:33,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 131 transitions. [2020-08-18 20:26:33,525 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 131 transitions. Word has length 128 [2020-08-18 20:26:33,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:33,525 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 131 transitions. [2020-08-18 20:26:33,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-08-18 20:26:33,525 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 131 transitions. [2020-08-18 20:26:33,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-08-18 20:26:33,526 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:33,526 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:33,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-08-18 20:26:33,527 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:33,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:33,527 INFO L82 PathProgramCache]: Analyzing trace with hash 2089102067, now seen corresponding path program 59 times [2020-08-18 20:26:33,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:33,527 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [212318081] [2020-08-18 20:26:33,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:33,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:35,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:26:35,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:26:35,539 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 0 proven. 3481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:26:35,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [212318081] [2020-08-18 20:26:35,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:26:35,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-08-18 20:26:35,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779273183] [2020-08-18 20:26:35,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-08-18 20:26:35,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:26:35,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-08-18 20:26:35,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1893, Invalid=2013, Unknown=0, NotChecked=0, Total=3906 [2020-08-18 20:26:35,541 INFO L87 Difference]: Start difference. First operand 131 states and 131 transitions. Second operand 63 states. [2020-08-18 20:26:35,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:26:35,886 INFO L93 Difference]: Finished difference Result 140 states and 140 transitions. [2020-08-18 20:26:35,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-08-18 20:26:35,887 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 130 [2020-08-18 20:26:35,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:26:35,888 INFO L225 Difference]: With dead ends: 140 [2020-08-18 20:26:35,888 INFO L226 Difference]: Without dead ends: 134 [2020-08-18 20:26:35,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1893, Invalid=2013, Unknown=0, NotChecked=0, Total=3906 [2020-08-18 20:26:35,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-08-18 20:26:35,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2020-08-18 20:26:35,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-18 20:26:35,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2020-08-18 20:26:35,893 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 130 [2020-08-18 20:26:35,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:26:35,893 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2020-08-18 20:26:35,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 63 states. [2020-08-18 20:26:35,893 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2020-08-18 20:26:35,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-18 20:26:35,894 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:26:35,894 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:26:35,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2020-08-18 20:26:35,895 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:26:35,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:26:35,895 INFO L82 PathProgramCache]: Analyzing trace with hash 1036637461, now seen corresponding path program 60 times [2020-08-18 20:26:35,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:26:35,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1040215763] [2020-08-18 20:26:35,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:26:35,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat