/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=HIGHLEXORDER -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 19:37:21,185 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 19:37:21,188 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 19:37:21,224 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 19:37:21,224 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 19:37:21,236 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 19:37:21,237 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 19:37:21,240 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 19:37:21,243 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 19:37:21,246 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 19:37:21,247 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 19:37:21,249 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 19:37:21,249 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 19:37:21,252 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 19:37:21,254 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 19:37:21,255 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 19:37:21,255 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 19:37:21,258 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 19:37:21,260 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 19:37:21,266 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 19:37:21,268 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 19:37:21,268 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 19:37:21,270 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 19:37:21,270 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 19:37:21,275 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 19:37:21,284 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 19:37:21,285 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 19:37:21,286 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 19:37:21,287 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 19:37:21,325 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 19:37:21,326 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 19:37:21,328 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 19:37:21,328 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 19:37:21,328 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 19:37:21,328 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 19:37:21,329 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 19:37:21,329 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 19:37:21,329 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 19:37:21,329 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 19:37:21,330 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 19:37:21,330 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 19:37:21,331 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 19:37:21,331 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 19:37:21,331 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 19:37:21,331 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 19:37:21,332 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 19:37:21,332 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 19:37:21,332 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 19:37:21,332 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 19:37:21,332 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 19:37:21,333 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 19:37:21,333 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 19:37:21,333 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 19:37:21,333 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 19:37:21,333 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 19:37:21,334 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 19:37:21,334 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 19:37:21,334 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 19:37:21,334 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=HIGHLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER; [2020-08-18 19:37:21,622 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 19:37:21,634 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 19:37:21,637 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 19:37:21,639 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 19:37:21,639 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 19:37:21,640 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-18 19:37:21,698 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/94908c200/b17d7624c59f478a9c641178970fdbc3/FLAG031559d83 [2020-08-18 19:37:22,091 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 19:37:22,094 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-18 19:37:22,100 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/94908c200/b17d7624c59f478a9c641178970fdbc3/FLAG031559d83 [2020-08-18 19:37:22,466 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/94908c200/b17d7624c59f478a9c641178970fdbc3 [2020-08-18 19:37:22,473 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 19:37:22,475 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 19:37:22,475 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 19:37:22,476 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 19:37:22,479 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 19:37:22,480 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:37:22" (1/1) ... [2020-08-18 19:37:22,483 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d265cc9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:22, skipping insertion in model container [2020-08-18 19:37:22,483 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:37:22" (1/1) ... [2020-08-18 19:37:22,490 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 19:37:22,506 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 19:37:22,681 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:37:22,685 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 19:37:22,704 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:37:22,724 INFO L208 MainTranslator]: Completed translation [2020-08-18 19:37:22,724 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:22 WrapperNode [2020-08-18 19:37:22,725 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 19:37:22,725 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 19:37:22,726 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 19:37:22,726 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 19:37:22,826 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:22" (1/1) ... [2020-08-18 19:37:22,828 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:22" (1/1) ... [2020-08-18 19:37:22,835 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:22" (1/1) ... [2020-08-18 19:37:22,836 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:22" (1/1) ... [2020-08-18 19:37:22,841 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:22" (1/1) ... [2020-08-18 19:37:22,846 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:22" (1/1) ... [2020-08-18 19:37:22,847 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:22" (1/1) ... [2020-08-18 19:37:22,855 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 19:37:22,855 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 19:37:22,855 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 19:37:22,855 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 19:37:22,856 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:22" (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 19:37:22,924 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 19:37:22,924 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 19:37:22,924 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 19:37:22,924 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 19:37:22,926 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 19:37:22,926 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 19:37:22,926 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 19:37:22,926 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 19:37:22,926 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 19:37:22,927 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 19:37:22,927 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 19:37:22,927 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 19:37:22,927 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 19:37:23,120 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 19:37:23,120 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 19:37:23,123 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:37:23 BoogieIcfgContainer [2020-08-18 19:37:23,124 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 19:37:23,125 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 19:37:23,125 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 19:37:23,128 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 19:37:23,128 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 07:37:22" (1/3) ... [2020-08-18 19:37:23,129 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40974923 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:37:23, skipping insertion in model container [2020-08-18 19:37:23,129 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:22" (2/3) ... [2020-08-18 19:37:23,130 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40974923 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:37:23, skipping insertion in model container [2020-08-18 19:37:23,130 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:37:23" (3/3) ... [2020-08-18 19:37:23,131 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-18 19:37:23,141 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 19:37:23,147 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 19:37:23,160 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 19:37:23,180 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 19:37:23,181 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 19:37:23,181 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 19:37:23,181 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 19:37:23,181 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 19:37:23,181 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 19:37:23,181 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 19:37:23,181 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 19:37:23,196 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-18 19:37:23,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 19:37:23,201 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:23,202 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:23,202 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:23,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:23,207 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-18 19:37:23,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:23,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072344528] [2020-08-18 19:37:23,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:23,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:23,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:23,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:23,406 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 19:37:23,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072344528] [2020-08-18 19:37:23,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:23,422 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 19:37:23,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308556834] [2020-08-18 19:37:23,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 19:37:23,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:23,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 19:37:23,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 19:37:23,483 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-18 19:37:23,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:23,563 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-18 19:37:23,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 19:37:23,565 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-18 19:37:23,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:23,573 INFO L225 Difference]: With dead ends: 34 [2020-08-18 19:37:23,573 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 19:37:23,577 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 19:37:23,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 19:37:23,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 19:37:23,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 19:37:23,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 19:37:23,615 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 19:37:23,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:23,616 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 19:37:23,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 19:37:23,616 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 19:37:23,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 19:37:23,617 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:23,617 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:23,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 19:37:23,618 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:23,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:23,618 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-18 19:37:23,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:23,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581469551] [2020-08-18 19:37:23,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:23,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:23,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:23,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:23,709 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 19:37:23,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581469551] [2020-08-18 19:37:23,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:23,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 19:37:23,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428792885] [2020-08-18 19:37:23,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 19:37:23,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:23,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 19:37:23,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 19:37:23,713 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-18 19:37:23,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:23,756 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 19:37:23,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 19:37:23,757 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 19:37:23,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:23,758 INFO L225 Difference]: With dead ends: 22 [2020-08-18 19:37:23,758 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 19:37:23,760 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 19:37:23,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 19:37:23,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-18 19:37:23,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 19:37:23,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 19:37:23,766 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-18 19:37:23,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:23,766 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 19:37:23,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 19:37:23,767 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 19:37:23,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 19:37:23,768 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:23,768 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:23,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 19:37:23,768 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:23,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:23,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-18 19:37:23,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:23,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [303183985] [2020-08-18 19:37:23,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:23,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:23,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:23,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:23,831 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 19:37:23,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [303183985] [2020-08-18 19:37:23,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:23,832 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 19:37:23,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667842634] [2020-08-18 19:37:23,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 19:37:23,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:23,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 19:37:23,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:37:23,834 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-18 19:37:23,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:23,886 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 19:37:23,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 19:37:23,887 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-18 19:37:23,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:23,887 INFO L225 Difference]: With dead ends: 24 [2020-08-18 19:37:23,888 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 19:37:23,888 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 19:37:23,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 19:37:23,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-18 19:37:23,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 19:37:23,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 19:37:23,894 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-18 19:37:23,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:23,894 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 19:37:23,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 19:37:23,895 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 19:37:23,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 19:37:23,896 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:23,896 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:23,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 19:37:23,896 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:23,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:23,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-18 19:37:23,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:23,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1149489219] [2020-08-18 19:37:23,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:23,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:23,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:23,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:23,997 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 19:37:23,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1149489219] [2020-08-18 19:37:23,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:23,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 19:37:23,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346133770] [2020-08-18 19:37:23,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 19:37:23,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:23,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 19:37:23,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:37:23,999 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-18 19:37:24,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:24,047 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 19:37:24,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 19:37:24,048 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-18 19:37:24,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:24,048 INFO L225 Difference]: With dead ends: 26 [2020-08-18 19:37:24,049 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 19:37:24,049 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 19:37:24,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 19:37:24,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-18 19:37:24,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 19:37:24,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 19:37:24,054 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-18 19:37:24,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:24,055 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 19:37:24,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 19:37:24,055 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 19:37:24,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 19:37:24,056 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:24,056 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:24,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 19:37:24,057 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:24,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:24,057 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-18 19:37:24,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:24,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662326528] [2020-08-18 19:37:24,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:24,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:24,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,170 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 19:37:24,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1662326528] [2020-08-18 19:37:24,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:24,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 19:37:24,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317316512] [2020-08-18 19:37:24,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 19:37:24,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:24,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 19:37:24,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 19:37:24,173 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-18 19:37:24,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:24,248 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 19:37:24,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 19:37:24,248 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 19:37:24,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:24,249 INFO L225 Difference]: With dead ends: 28 [2020-08-18 19:37:24,249 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 19:37:24,250 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 19:37:24,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 19:37:24,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 19:37:24,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 19:37:24,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 19:37:24,261 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-18 19:37:24,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:24,261 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 19:37:24,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 19:37:24,262 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 19:37:24,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 19:37:24,262 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:24,263 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:24,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 19:37:24,264 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:24,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:24,264 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-18 19:37:24,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:24,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139915106] [2020-08-18 19:37:24,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:24,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:24,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,402 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 19:37:24,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139915106] [2020-08-18 19:37:24,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:24,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 19:37:24,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343041679] [2020-08-18 19:37:24,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 19:37:24,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:24,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 19:37:24,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 19:37:24,405 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-18 19:37:24,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:24,464 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 19:37:24,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 19:37:24,465 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-18 19:37:24,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:24,466 INFO L225 Difference]: With dead ends: 30 [2020-08-18 19:37:24,466 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 19:37:24,467 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 19:37:24,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 19:37:24,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 19:37:24,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 19:37:24,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 19:37:24,472 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-18 19:37:24,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:24,472 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 19:37:24,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 19:37:24,473 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 19:37:24,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 19:37:24,474 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:24,474 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:24,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 19:37:24,474 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:24,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:24,475 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-18 19:37:24,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:24,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011029997] [2020-08-18 19:37:24,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:24,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:24,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,583 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 19:37:24,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011029997] [2020-08-18 19:37:24,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:24,584 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 19:37:24,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988898829] [2020-08-18 19:37:24,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 19:37:24,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:24,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 19:37:24,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 19:37:24,586 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-18 19:37:24,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:24,645 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 19:37:24,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 19:37:24,645 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-18 19:37:24,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:24,646 INFO L225 Difference]: With dead ends: 32 [2020-08-18 19:37:24,646 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 19:37:24,647 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 19:37:24,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 19:37:24,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 19:37:24,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 19:37:24,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 19:37:24,652 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-18 19:37:24,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:24,653 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 19:37:24,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 19:37:24,653 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 19:37:24,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 19:37:24,654 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:24,654 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:24,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 19:37:24,654 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:24,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:24,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-18 19:37:24,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:24,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449975030] [2020-08-18 19:37:24,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:24,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:24,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,751 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 19:37:24,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449975030] [2020-08-18 19:37:24,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:24,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 19:37:24,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149424586] [2020-08-18 19:37:24,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 19:37:24,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:24,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 19:37:24,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 19:37:24,754 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-18 19:37:24,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:24,811 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 19:37:24,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 19:37:24,812 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-18 19:37:24,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:24,813 INFO L225 Difference]: With dead ends: 34 [2020-08-18 19:37:24,813 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 19:37:24,813 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 19:37:24,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 19:37:24,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 19:37:24,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 19:37:24,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 19:37:24,819 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-18 19:37:24,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:24,819 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 19:37:24,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 19:37:24,819 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 19:37:24,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 19:37:24,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:24,820 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:24,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 19:37:24,820 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:24,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:24,821 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-18 19:37:24,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:24,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280456335] [2020-08-18 19:37:24,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:24,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:24,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,953 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 19:37:24,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280456335] [2020-08-18 19:37:24,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:24,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 19:37:24,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119635432] [2020-08-18 19:37:24,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 19:37:24,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:24,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 19:37:24,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 19:37:24,956 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-18 19:37:25,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,041 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 19:37:25,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 19:37:25,042 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-18 19:37:25,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,043 INFO L225 Difference]: With dead ends: 36 [2020-08-18 19:37:25,043 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 19:37:25,043 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 19:37:25,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 19:37:25,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 19:37:25,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 19:37:25,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 19:37:25,048 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-18 19:37:25,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,049 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 19:37:25,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 19:37:25,049 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 19:37:25,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 19:37:25,050 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,050 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 19:37:25,050 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,051 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-18 19:37:25,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1588095557] [2020-08-18 19:37:25,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:25,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,154 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 19:37:25,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1588095557] [2020-08-18 19:37:25,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:25,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 19:37:25,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006687358] [2020-08-18 19:37:25,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 19:37:25,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:25,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 19:37:25,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 19:37:25,157 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-18 19:37:25,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,238 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 19:37:25,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 19:37:25,238 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-18 19:37:25,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,239 INFO L225 Difference]: With dead ends: 38 [2020-08-18 19:37:25,239 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 19:37:25,240 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 19:37:25,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 19:37:25,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 19:37:25,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 19:37:25,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 19:37:25,246 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-18 19:37:25,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,246 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 19:37:25,246 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 19:37:25,246 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 19:37:25,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 19:37:25,247 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,248 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,248 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 19:37:25,248 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,248 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-18 19:37:25,249 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [522863760] [2020-08-18 19:37:25,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:25,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,381 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 19:37:25,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [522863760] [2020-08-18 19:37:25,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:25,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 19:37:25,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210367184] [2020-08-18 19:37:25,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 19:37:25,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:25,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 19:37:25,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 19:37:25,383 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-18 19:37:25,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,446 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 19:37:25,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 19:37:25,447 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-18 19:37:25,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,447 INFO L225 Difference]: With dead ends: 40 [2020-08-18 19:37:25,448 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 19:37:25,448 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 19:37:25,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 19:37:25,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 19:37:25,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 19:37:25,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 19:37:25,453 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-18 19:37:25,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,454 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 19:37:25,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 19:37:25,454 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 19:37:25,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 19:37:25,455 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,455 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 19:37:25,455 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,456 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-18 19:37:25,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1486591795] [2020-08-18 19:37:25,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:25,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,582 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 19:37:25,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1486591795] [2020-08-18 19:37:25,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:25,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 19:37:25,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250570753] [2020-08-18 19:37:25,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 19:37:25,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:25,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 19:37:25,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 19:37:25,584 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-18 19:37:25,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,643 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 19:37:25,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 19:37:25,643 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-18 19:37:25,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,644 INFO L225 Difference]: With dead ends: 42 [2020-08-18 19:37:25,644 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 19:37:25,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 19:37:25,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 19:37:25,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 19:37:25,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 19:37:25,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 19:37:25,650 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-18 19:37:25,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,650 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 19:37:25,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 19:37:25,651 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 19:37:25,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 19:37:25,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,652 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 19:37:25,652 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,652 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-18 19:37:25,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621023331] [2020-08-18 19:37:25,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:25,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,806 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 19:37:25,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621023331] [2020-08-18 19:37:25,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:25,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 19:37:25,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358680548] [2020-08-18 19:37:25,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 19:37:25,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:25,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 19:37:25,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-18 19:37:25,808 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-18 19:37:25,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,894 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 19:37:25,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 19:37:25,894 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-18 19:37:25,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,895 INFO L225 Difference]: With dead ends: 44 [2020-08-18 19:37:25,895 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 19:37:25,896 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 19:37:25,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 19:37:25,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 19:37:25,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 19:37:25,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 19:37:25,906 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-18 19:37:25,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,907 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 19:37:25,907 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 19:37:25,907 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 19:37:25,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 19:37:25,909 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,909 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 19:37:25,909 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,909 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-18 19:37:25,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531226649] [2020-08-18 19:37:25,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:26,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,109 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 19:37:26,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531226649] [2020-08-18 19:37:26,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:26,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 19:37:26,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355767624] [2020-08-18 19:37:26,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 19:37:26,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:26,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 19:37:26,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-18 19:37:26,111 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-18 19:37:26,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:26,190 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 19:37:26,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 19:37:26,190 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-18 19:37:26,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:26,191 INFO L225 Difference]: With dead ends: 46 [2020-08-18 19:37:26,191 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 19:37:26,191 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 19:37:26,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 19:37:26,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 19:37:26,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 19:37:26,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 19:37:26,196 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-18 19:37:26,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:26,196 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 19:37:26,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 19:37:26,197 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 19:37:26,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 19:37:26,197 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:26,198 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:26,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 19:37:26,198 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:26,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:26,198 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-18 19:37:26,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:26,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1464538844] [2020-08-18 19:37:26,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:26,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:26,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,348 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 19:37:26,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1464538844] [2020-08-18 19:37:26,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:26,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 19:37:26,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609041283] [2020-08-18 19:37:26,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 19:37:26,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:26,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 19:37:26,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-18 19:37:26,351 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-18 19:37:26,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:26,455 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 19:37:26,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 19:37:26,455 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-18 19:37:26,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:26,456 INFO L225 Difference]: With dead ends: 48 [2020-08-18 19:37:26,456 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 19:37:26,457 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 19:37:26,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 19:37:26,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 19:37:26,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 19:37:26,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 19:37:26,462 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-18 19:37:26,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:26,462 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 19:37:26,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 19:37:26,462 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 19:37:26,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 19:37:26,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:26,463 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:26,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 19:37:26,464 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:26,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:26,464 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-18 19:37:26,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:26,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [641919795] [2020-08-18 19:37:26,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:26,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:26,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,645 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 19:37:26,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [641919795] [2020-08-18 19:37:26,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:26,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 19:37:26,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026550146] [2020-08-18 19:37:26,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 19:37:26,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:26,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 19:37:26,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-18 19:37:26,647 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-18 19:37:26,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:26,751 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 19:37:26,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 19:37:26,752 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-18 19:37:26,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:26,753 INFO L225 Difference]: With dead ends: 50 [2020-08-18 19:37:26,753 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 19:37:26,754 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 19:37:26,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 19:37:26,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 19:37:26,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 19:37:26,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 19:37:26,759 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-18 19:37:26,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:26,760 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 19:37:26,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 19:37:26,760 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 19:37:26,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 19:37:26,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:26,761 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:26,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 19:37:26,761 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:26,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:26,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-18 19:37:26,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:26,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1785819916] [2020-08-18 19:37:26,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:26,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:26,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,970 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 19:37:26,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1785819916] [2020-08-18 19:37:26,971 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:26,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 19:37:26,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590504703] [2020-08-18 19:37:26,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 19:37:26,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:26,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 19:37:26,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-18 19:37:26,973 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-18 19:37:27,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:27,072 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 19:37:27,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 19:37:27,073 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-18 19:37:27,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:27,074 INFO L225 Difference]: With dead ends: 52 [2020-08-18 19:37:27,074 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 19:37:27,074 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 19:37:27,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 19:37:27,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 19:37:27,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 19:37:27,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 19:37:27,079 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-18 19:37:27,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:27,080 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 19:37:27,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 19:37:27,080 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 19:37:27,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 19:37:27,080 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:27,081 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:27,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 19:37:27,081 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:27,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:27,081 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-18 19:37:27,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:27,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1522041954] [2020-08-18 19:37:27,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:27,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:27,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:27,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:27,302 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 19:37:27,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1522041954] [2020-08-18 19:37:27,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:27,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 19:37:27,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792443508] [2020-08-18 19:37:27,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 19:37:27,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:27,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 19:37:27,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-18 19:37:27,304 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-18 19:37:27,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:27,413 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 19:37:27,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 19:37:27,413 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-18 19:37:27,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:27,414 INFO L225 Difference]: With dead ends: 54 [2020-08-18 19:37:27,414 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 19:37:27,415 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 19:37:27,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 19:37:27,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-18 19:37:27,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 19:37:27,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 19:37:27,421 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-18 19:37:27,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:27,421 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 19:37:27,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 19:37:27,422 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 19:37:27,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 19:37:27,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:27,423 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:27,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 19:37:27,423 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:27,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:27,423 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-18 19:37:27,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:27,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296487809] [2020-08-18 19:37:27,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:27,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:27,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:27,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:27,689 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 19:37:27,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296487809] [2020-08-18 19:37:27,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:27,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 19:37:27,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299658975] [2020-08-18 19:37:27,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 19:37:27,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:27,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 19:37:27,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-18 19:37:27,693 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-18 19:37:27,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:27,773 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 19:37:27,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 19:37:27,773 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-18 19:37:27,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:27,774 INFO L225 Difference]: With dead ends: 56 [2020-08-18 19:37:27,774 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 19:37:27,775 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 19:37:27,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 19:37:27,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-18 19:37:27,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 19:37:27,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 19:37:27,782 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-18 19:37:27,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:27,783 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 19:37:27,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 19:37:27,783 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 19:37:27,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 19:37:27,784 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:27,785 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:27,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 19:37:27,785 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:27,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:27,786 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-18 19:37:27,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:27,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [502226832] [2020-08-18 19:37:27,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:27,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:28,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:28,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:28,072 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 19:37:28,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [502226832] [2020-08-18 19:37:28,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:28,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 19:37:28,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574865791] [2020-08-18 19:37:28,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 19:37:28,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:28,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 19:37:28,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-18 19:37:28,074 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-18 19:37:28,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:28,157 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 19:37:28,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 19:37:28,158 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-18 19:37:28,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:28,158 INFO L225 Difference]: With dead ends: 58 [2020-08-18 19:37:28,159 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 19:37:28,160 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 19:37:28,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 19:37:28,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 19:37:28,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 19:37:28,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 19:37:28,172 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-18 19:37:28,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:28,173 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 19:37:28,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 19:37:28,175 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 19:37:28,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 19:37:28,176 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:28,176 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:28,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 19:37:28,177 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:28,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:28,177 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-18 19:37:28,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:28,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646039039] [2020-08-18 19:37:28,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:28,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:28,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:28,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:28,565 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 19:37:28,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646039039] [2020-08-18 19:37:28,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:28,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 19:37:28,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794207693] [2020-08-18 19:37:28,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 19:37:28,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:28,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 19:37:28,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-18 19:37:28,569 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-18 19:37:28,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:28,688 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 19:37:28,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 19:37:28,689 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-18 19:37:28,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:28,689 INFO L225 Difference]: With dead ends: 60 [2020-08-18 19:37:28,690 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 19:37:28,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-18 19:37:28,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 19:37:28,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 19:37:28,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 19:37:28,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 19:37:28,697 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-18 19:37:28,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:28,698 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 19:37:28,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 19:37:28,698 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 19:37:28,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 19:37:28,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:28,702 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:28,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 19:37:28,702 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:28,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:28,703 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-18 19:37:28,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:28,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [262505801] [2020-08-18 19:37:28,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:28,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:29,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:29,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:29,010 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 19:37:29,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [262505801] [2020-08-18 19:37:29,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:29,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 19:37:29,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874599433] [2020-08-18 19:37:29,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 19:37:29,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:29,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 19:37:29,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-18 19:37:29,012 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-18 19:37:29,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:29,126 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 19:37:29,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 19:37:29,129 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-18 19:37:29,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:29,129 INFO L225 Difference]: With dead ends: 62 [2020-08-18 19:37:29,130 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 19:37:29,130 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 19:37:29,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 19:37:29,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 19:37:29,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 19:37:29,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 19:37:29,136 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-18 19:37:29,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:29,137 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 19:37:29,137 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 19:37:29,137 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 19:37:29,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 19:37:29,137 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:29,138 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:29,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 19:37:29,140 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:29,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:29,140 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-18 19:37:29,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:29,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [564539285] [2020-08-18 19:37:29,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:29,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:29,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:29,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:29,470 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 19:37:29,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [564539285] [2020-08-18 19:37:29,471 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:29,471 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 19:37:29,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637512796] [2020-08-18 19:37:29,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 19:37:29,472 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:29,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 19:37:29,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-18 19:37:29,473 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-18 19:37:29,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:29,586 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 19:37:29,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 19:37:29,587 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-18 19:37:29,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:29,588 INFO L225 Difference]: With dead ends: 64 [2020-08-18 19:37:29,588 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 19:37:29,588 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 19:37:29,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 19:37:29,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 19:37:29,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 19:37:29,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 19:37:29,593 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-18 19:37:29,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:29,593 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 19:37:29,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 19:37:29,593 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 19:37:29,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 19:37:29,594 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:29,594 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:29,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 19:37:29,594 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:29,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:29,595 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-18 19:37:29,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:29,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [553598305] [2020-08-18 19:37:29,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:29,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:29,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:29,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:29,919 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 19:37:29,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [553598305] [2020-08-18 19:37:29,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:29,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 19:37:29,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190685195] [2020-08-18 19:37:29,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 19:37:29,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:29,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 19:37:29,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-18 19:37:29,921 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-18 19:37:30,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:30,040 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-18 19:37:30,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 19:37:30,040 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-18 19:37:30,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:30,041 INFO L225 Difference]: With dead ends: 66 [2020-08-18 19:37:30,041 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 19:37:30,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-18 19:37:30,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 19:37:30,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 19:37:30,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 19:37:30,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 19:37:30,046 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-18 19:37:30,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:30,047 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 19:37:30,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 19:37:30,047 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 19:37:30,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 19:37:30,048 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:30,048 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:30,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 19:37:30,051 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:30,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:30,052 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-18 19:37:30,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:30,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943524027] [2020-08-18 19:37:30,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:30,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:30,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:30,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:30,473 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 19:37:30,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943524027] [2020-08-18 19:37:30,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:30,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 19:37:30,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279376016] [2020-08-18 19:37:30,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 19:37:30,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:30,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 19:37:30,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-18 19:37:30,475 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-18 19:37:30,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:30,598 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-18 19:37:30,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 19:37:30,599 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-18 19:37:30,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:30,600 INFO L225 Difference]: With dead ends: 68 [2020-08-18 19:37:30,600 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 19:37:30,600 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 19:37:30,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 19:37:30,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 19:37:30,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 19:37:30,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-18 19:37:30,603 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-18 19:37:30,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:30,604 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-18 19:37:30,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 19:37:30,604 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-18 19:37:30,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 19:37:30,605 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:30,606 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:30,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 19:37:30,606 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:30,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:30,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-18 19:37:30,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:30,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [316796882] [2020-08-18 19:37:30,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:30,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:30,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:30,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:31,003 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 19:37:31,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [316796882] [2020-08-18 19:37:31,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:31,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 19:37:31,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746710301] [2020-08-18 19:37:31,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 19:37:31,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:31,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 19:37:31,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-18 19:37:31,005 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-18 19:37:31,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:31,166 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-18 19:37:31,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 19:37:31,166 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-18 19:37:31,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:31,167 INFO L225 Difference]: With dead ends: 70 [2020-08-18 19:37:31,168 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 19:37:31,168 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 19:37:31,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 19:37:31,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 19:37:31,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 19:37:31,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-18 19:37:31,173 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-18 19:37:31,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:31,173 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-18 19:37:31,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 19:37:31,174 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-18 19:37:31,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 19:37:31,174 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:31,175 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:31,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 19:37:31,175 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:31,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:31,176 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-18 19:37:31,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:31,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439664402] [2020-08-18 19:37:31,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:31,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:31,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:31,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:31,630 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 19:37:31,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439664402] [2020-08-18 19:37:31,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:31,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 19:37:31,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744702790] [2020-08-18 19:37:31,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 19:37:31,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:31,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 19:37:31,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-18 19:37:31,632 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-18 19:37:31,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:31,785 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-18 19:37:31,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 19:37:31,786 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-18 19:37:31,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:31,787 INFO L225 Difference]: With dead ends: 72 [2020-08-18 19:37:31,787 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 19:37:31,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-18 19:37:31,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 19:37:31,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 19:37:31,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 19:37:31,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-18 19:37:31,792 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-18 19:37:31,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:31,793 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-18 19:37:31,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 19:37:31,793 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-18 19:37:31,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 19:37:31,794 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:31,794 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:31,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 19:37:31,794 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:31,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:31,794 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-18 19:37:31,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:31,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053176232] [2020-08-18 19:37:31,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:31,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:32,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:32,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:32,244 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 19:37:32,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053176232] [2020-08-18 19:37:32,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:32,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 19:37:32,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59709484] [2020-08-18 19:37:32,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 19:37:32,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:32,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 19:37:32,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-18 19:37:32,246 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-18 19:37:32,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:32,400 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-18 19:37:32,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 19:37:32,401 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-18 19:37:32,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:32,402 INFO L225 Difference]: With dead ends: 74 [2020-08-18 19:37:32,402 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 19:37:32,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-18 19:37:32,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 19:37:32,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 19:37:32,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 19:37:32,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-18 19:37:32,407 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-18 19:37:32,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:32,407 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-18 19:37:32,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 19:37:32,407 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-18 19:37:32,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 19:37:32,408 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:32,408 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:32,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 19:37:32,408 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:32,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:32,409 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-18 19:37:32,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:32,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1711951382] [2020-08-18 19:37:32,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:32,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:32,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:32,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:32,858 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 19:37:32,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1711951382] [2020-08-18 19:37:32,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:32,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 19:37:32,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112889204] [2020-08-18 19:37:32,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 19:37:32,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:32,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 19:37:32,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-18 19:37:32,861 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-18 19:37:33,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:33,047 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-18 19:37:33,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 19:37:33,047 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-18 19:37:33,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:33,048 INFO L225 Difference]: With dead ends: 76 [2020-08-18 19:37:33,049 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 19:37:33,050 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 19:37:33,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 19:37:33,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 19:37:33,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 19:37:33,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-18 19:37:33,057 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-18 19:37:33,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:33,057 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-18 19:37:33,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 19:37:33,058 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-18 19:37:33,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 19:37:33,059 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:33,059 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:33,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 19:37:33,059 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:33,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:33,060 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-18 19:37:33,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:33,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1894209930] [2020-08-18 19:37:33,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:33,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:33,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:33,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:33,638 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 19:37:33,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1894209930] [2020-08-18 19:37:33,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:33,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 19:37:33,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332297743] [2020-08-18 19:37:33,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 19:37:33,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:33,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 19:37:33,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-18 19:37:33,641 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-18 19:37:33,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:33,867 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-18 19:37:33,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 19:37:33,868 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-18 19:37:33,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:33,869 INFO L225 Difference]: With dead ends: 78 [2020-08-18 19:37:33,869 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 19:37:33,870 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-18 19:37:33,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 19:37:33,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 19:37:33,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 19:37:33,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-18 19:37:33,875 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-18 19:37:33,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:33,876 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-18 19:37:33,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 19:37:33,876 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-18 19:37:33,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 19:37:33,877 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:33,877 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:33,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 19:37:33,878 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:33,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:33,879 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-18 19:37:33,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:33,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203637330] [2020-08-18 19:37:33,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:33,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:34,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:34,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:34,546 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 19:37:34,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203637330] [2020-08-18 19:37:34,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:34,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 19:37:34,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128300344] [2020-08-18 19:37:34,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 19:37:34,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:34,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 19:37:34,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 19:37:34,548 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-18 19:37:34,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:34,721 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-18 19:37:34,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 19:37:34,722 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-18 19:37:34,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:34,723 INFO L225 Difference]: With dead ends: 80 [2020-08-18 19:37:34,723 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 19:37:34,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 19:37:34,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 19:37:34,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 19:37:34,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 19:37:34,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-18 19:37:34,728 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-18 19:37:34,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:34,728 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-18 19:37:34,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 19:37:34,728 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-18 19:37:34,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 19:37:34,729 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:34,729 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:34,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 19:37:34,730 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:34,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:34,731 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-18 19:37:34,731 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:34,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718630260] [2020-08-18 19:37:34,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:34,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:35,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:35,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:35,474 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 19:37:35,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718630260] [2020-08-18 19:37:35,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:35,476 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 19:37:35,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475859756] [2020-08-18 19:37:35,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 19:37:35,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:35,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 19:37:35,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 19:37:35,478 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-18 19:37:35,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:35,688 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-18 19:37:35,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 19:37:35,689 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-18 19:37:35,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:35,690 INFO L225 Difference]: With dead ends: 82 [2020-08-18 19:37:35,690 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 19:37:35,691 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 19:37:35,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 19:37:35,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 19:37:35,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 19:37:35,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-18 19:37:35,697 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-18 19:37:35,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:35,697 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-18 19:37:35,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 19:37:35,697 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-18 19:37:35,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 19:37:35,698 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:35,698 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:35,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 19:37:35,698 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:35,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:35,699 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-18 19:37:35,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:35,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1729995743] [2020-08-18 19:37:35,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:35,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:36,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:36,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:36,320 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 19:37:36,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1729995743] [2020-08-18 19:37:36,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:36,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 19:37:36,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500258278] [2020-08-18 19:37:36,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 19:37:36,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:36,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 19:37:36,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 19:37:36,323 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-18 19:37:36,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:36,513 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-18 19:37:36,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 19:37:36,514 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-18 19:37:36,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:36,515 INFO L225 Difference]: With dead ends: 84 [2020-08-18 19:37:36,515 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 19:37:36,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 19:37:36,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 19:37:36,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 19:37:36,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 19:37:36,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-18 19:37:36,521 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-18 19:37:36,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:36,522 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-18 19:37:36,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 19:37:36,523 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-18 19:37:36,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 19:37:36,523 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:36,524 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:36,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 19:37:36,524 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:36,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:36,525 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-18 19:37:36,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:36,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471520577] [2020-08-18 19:37:36,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:36,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:37,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:37,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:37,200 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 19:37:37,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471520577] [2020-08-18 19:37:37,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:37,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 19:37:37,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198352743] [2020-08-18 19:37:37,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 19:37:37,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:37,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 19:37:37,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 19:37:37,203 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-18 19:37:37,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:37,362 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-18 19:37:37,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 19:37:37,363 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-18 19:37:37,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:37,364 INFO L225 Difference]: With dead ends: 86 [2020-08-18 19:37:37,364 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 19:37:37,365 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 19:37:37,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 19:37:37,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 19:37:37,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 19:37:37,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-18 19:37:37,369 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-18 19:37:37,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:37,370 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-18 19:37:37,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 19:37:37,370 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-18 19:37:37,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 19:37:37,371 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:37,371 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:37,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 19:37:37,371 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:37,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:37,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-18 19:37:37,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:37,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2011141178] [2020-08-18 19:37:37,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:37,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:38,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:38,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:38,017 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 19:37:38,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2011141178] [2020-08-18 19:37:38,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:38,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 19:37:38,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843627238] [2020-08-18 19:37:38,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 19:37:38,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:38,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 19:37:38,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 19:37:38,019 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-18 19:37:38,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:38,231 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-18 19:37:38,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 19:37:38,232 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-18 19:37:38,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:38,233 INFO L225 Difference]: With dead ends: 88 [2020-08-18 19:37:38,233 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 19:37:38,234 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 19:37:38,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 19:37:38,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 19:37:38,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 19:37:38,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-18 19:37:38,237 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-18 19:37:38,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:38,238 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-18 19:37:38,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 19:37:38,238 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-18 19:37:38,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 19:37:38,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:38,239 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:38,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 19:37:38,239 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:38,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:38,240 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-18 19:37:38,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:38,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1598323960] [2020-08-18 19:37:38,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:38,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:39,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:39,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:39,018 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 19:37:39,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1598323960] [2020-08-18 19:37:39,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:39,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 19:37:39,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137011445] [2020-08-18 19:37:39,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 19:37:39,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:39,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 19:37:39,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 19:37:39,021 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-18 19:37:39,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:39,189 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-18 19:37:39,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 19:37:39,190 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-18 19:37:39,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:39,191 INFO L225 Difference]: With dead ends: 90 [2020-08-18 19:37:39,191 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 19:37:39,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 19:37:39,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 19:37:39,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 19:37:39,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 19:37:39,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-18 19:37:39,198 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-18 19:37:39,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:39,198 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-18 19:37:39,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 19:37:39,199 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-18 19:37:39,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 19:37:39,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:39,200 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:39,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 19:37:39,200 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:39,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:39,200 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-18 19:37:39,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:39,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [794363545] [2020-08-18 19:37:39,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:39,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:39,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:39,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:39,937 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 19:37:39,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [794363545] [2020-08-18 19:37:39,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:39,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 19:37:39,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202121655] [2020-08-18 19:37:39,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 19:37:39,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:39,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 19:37:39,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 19:37:39,941 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-18 19:37:40,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:40,090 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-18 19:37:40,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 19:37:40,090 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-18 19:37:40,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:40,091 INFO L225 Difference]: With dead ends: 92 [2020-08-18 19:37:40,091 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 19:37:40,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 19:37:40,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 19:37:40,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 19:37:40,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 19:37:40,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-18 19:37:40,096 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-18 19:37:40,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:40,097 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-18 19:37:40,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 19:37:40,097 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-18 19:37:40,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 19:37:40,098 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:40,098 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:40,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 19:37:40,098 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:40,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:40,099 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-18 19:37:40,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:40,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920682574] [2020-08-18 19:37:40,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:40,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:40,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:40,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:40,883 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 19:37:40,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920682574] [2020-08-18 19:37:40,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:40,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 19:37:40,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343482776] [2020-08-18 19:37:40,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 19:37:40,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:40,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 19:37:40,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 19:37:40,886 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-18 19:37:41,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:41,095 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-18 19:37:41,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 19:37:41,096 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-18 19:37:41,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:41,097 INFO L225 Difference]: With dead ends: 94 [2020-08-18 19:37:41,097 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 19:37:41,098 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 19:37:41,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 19:37:41,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 19:37:41,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 19:37:41,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-18 19:37:41,104 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-18 19:37:41,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:41,104 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-18 19:37:41,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 19:37:41,105 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-18 19:37:41,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 19:37:41,106 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:41,106 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:41,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 19:37:41,106 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:41,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:41,107 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-18 19:37:41,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:41,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891105915] [2020-08-18 19:37:41,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:41,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:42,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:42,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:42,138 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 19:37:42,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891105915] [2020-08-18 19:37:42,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:42,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 19:37:42,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892170106] [2020-08-18 19:37:42,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 19:37:42,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:42,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 19:37:42,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 19:37:42,142 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-18 19:37:42,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:42,404 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-18 19:37:42,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 19:37:42,404 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-18 19:37:42,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:42,405 INFO L225 Difference]: With dead ends: 96 [2020-08-18 19:37:42,405 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 19:37:42,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 19:37:42,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 19:37:42,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 19:37:42,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 19:37:42,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-18 19:37:42,410 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-18 19:37:42,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:42,410 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-18 19:37:42,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 19:37:42,410 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-18 19:37:42,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 19:37:42,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:42,411 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:42,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 19:37:42,411 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:42,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:42,412 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-18 19:37:42,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:42,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1671891280] [2020-08-18 19:37:42,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:42,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:43,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:43,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:43,279 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 19:37:43,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1671891280] [2020-08-18 19:37:43,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:43,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 19:37:43,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277518811] [2020-08-18 19:37:43,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 19:37:43,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:43,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 19:37:43,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 19:37:43,281 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-18 19:37:43,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:43,515 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-18 19:37:43,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 19:37:43,515 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-18 19:37:43,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:43,516 INFO L225 Difference]: With dead ends: 98 [2020-08-18 19:37:43,517 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 19:37:43,517 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 19:37:43,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 19:37:43,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 19:37:43,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 19:37:43,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-18 19:37:43,522 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-18 19:37:43,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:43,523 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-18 19:37:43,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 19:37:43,523 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-18 19:37:43,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 19:37:43,524 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:43,524 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:43,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 19:37:43,524 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:43,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:43,524 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-18 19:37:43,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:43,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1540494130] [2020-08-18 19:37:43,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:43,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:44,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:44,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:44,493 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 19:37:44,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1540494130] [2020-08-18 19:37:44,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:44,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 19:37:44,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775108929] [2020-08-18 19:37:44,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 19:37:44,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:44,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 19:37:44,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 19:37:44,495 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-18 19:37:44,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:44,725 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-18 19:37:44,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 19:37:44,726 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-18 19:37:44,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:44,727 INFO L225 Difference]: With dead ends: 100 [2020-08-18 19:37:44,727 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 19:37:44,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 19:37:44,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 19:37:44,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 19:37:44,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 19:37:44,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-18 19:37:44,732 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-18 19:37:44,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:44,732 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-18 19:37:44,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 19:37:44,732 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-18 19:37:44,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 19:37:44,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:44,733 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:44,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 19:37:44,734 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:44,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:44,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-18 19:37:44,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:44,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1837290274] [2020-08-18 19:37:44,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:44,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:45,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:45,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:45,696 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 19:37:45,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1837290274] [2020-08-18 19:37:45,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:45,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 19:37:45,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076588507] [2020-08-18 19:37:45,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 19:37:45,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:45,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 19:37:45,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 19:37:45,699 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-18 19:37:45,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:45,863 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-18 19:37:45,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 19:37:45,864 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-18 19:37:45,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:45,865 INFO L225 Difference]: With dead ends: 102 [2020-08-18 19:37:45,865 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 19:37:45,867 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 19:37:45,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 19:37:45,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 19:37:45,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 19:37:45,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-18 19:37:45,876 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-18 19:37:45,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:45,876 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-18 19:37:45,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 19:37:45,877 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-18 19:37:45,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 19:37:45,879 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:45,879 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:45,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 19:37:45,880 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:45,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:45,882 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-18 19:37:45,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:45,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174972645] [2020-08-18 19:37:45,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:45,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:46,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:46,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:46,872 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 19:37:46,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174972645] [2020-08-18 19:37:46,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:46,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 19:37:46,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872076097] [2020-08-18 19:37:46,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 19:37:46,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:46,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 19:37:46,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 19:37:46,874 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-18 19:37:47,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:47,142 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-18 19:37:47,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 19:37:47,142 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-18 19:37:47,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:47,144 INFO L225 Difference]: With dead ends: 104 [2020-08-18 19:37:47,144 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 19:37:47,145 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 19:37:47,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 19:37:47,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 19:37:47,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 19:37:47,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-18 19:37:47,150 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-18 19:37:47,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:47,150 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-18 19:37:47,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 19:37:47,151 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-18 19:37:47,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 19:37:47,151 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:47,151 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:47,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 19:37:47,152 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:47,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:47,152 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-18 19:37:47,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:47,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359003825] [2020-08-18 19:37:47,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:47,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:48,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:48,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:48,164 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 19:37:48,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359003825] [2020-08-18 19:37:48,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:48,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 19:37:48,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184854462] [2020-08-18 19:37:48,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 19:37:48,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:48,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 19:37:48,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 19:37:48,167 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-18 19:37:48,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:48,299 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-18 19:37:48,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 19:37:48,299 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-18 19:37:48,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:48,300 INFO L225 Difference]: With dead ends: 106 [2020-08-18 19:37:48,301 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 19:37:48,301 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 19:37:48,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 19:37:48,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 19:37:48,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 19:37:48,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-18 19:37:48,306 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-18 19:37:48,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:48,306 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-18 19:37:48,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 19:37:48,307 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-18 19:37:48,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 19:37:48,307 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:48,307 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:48,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 19:37:48,308 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:48,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:48,308 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-18 19:37:48,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:48,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704334324] [2020-08-18 19:37:48,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:48,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:49,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:49,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:49,376 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 19:37:49,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704334324] [2020-08-18 19:37:49,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:49,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 19:37:49,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328336819] [2020-08-18 19:37:49,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 19:37:49,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:49,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 19:37:49,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 19:37:49,378 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-18 19:37:49,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:49,641 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-18 19:37:49,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 19:37:49,642 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-18 19:37:49,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:49,643 INFO L225 Difference]: With dead ends: 108 [2020-08-18 19:37:49,643 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 19:37:49,644 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 19:37:49,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 19:37:49,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 19:37:49,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 19:37:49,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-18 19:37:49,647 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-18 19:37:49,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:49,648 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-18 19:37:49,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 19:37:49,648 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-18 19:37:49,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 19:37:49,649 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:49,649 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:49,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 19:37:49,649 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:49,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:49,650 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-18 19:37:49,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:49,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531566829] [2020-08-18 19:37:49,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:49,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:50,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:50,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:50,785 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 19:37:50,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531566829] [2020-08-18 19:37:50,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:50,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 19:37:50,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921127803] [2020-08-18 19:37:50,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 19:37:50,786 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:50,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 19:37:50,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 19:37:50,786 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-18 19:37:50,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:50,991 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-18 19:37:50,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 19:37:50,991 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-18 19:37:50,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:50,992 INFO L225 Difference]: With dead ends: 110 [2020-08-18 19:37:50,992 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 19:37:50,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 19:37:50,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 19:37:50,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 19:37:50,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 19:37:50,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-18 19:37:50,996 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-18 19:37:50,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:50,997 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-18 19:37:50,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 19:37:50,997 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-18 19:37:50,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 19:37:50,997 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:50,998 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:50,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 19:37:50,998 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:50,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:50,998 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-18 19:37:50,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:50,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1996966115] [2020-08-18 19:37:50,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:51,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:52,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:52,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:52,180 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 19:37:52,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1996966115] [2020-08-18 19:37:52,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:52,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 19:37:52,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457290256] [2020-08-18 19:37:52,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 19:37:52,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:52,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 19:37:52,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 19:37:52,182 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-18 19:37:52,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:52,354 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-18 19:37:52,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 19:37:52,355 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-18 19:37:52,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:52,356 INFO L225 Difference]: With dead ends: 112 [2020-08-18 19:37:52,356 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 19:37:52,357 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 19:37:52,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 19:37:52,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 19:37:52,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 19:37:52,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-18 19:37:52,361 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-18 19:37:52,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:52,361 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-18 19:37:52,361 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 19:37:52,362 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-18 19:37:52,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-18 19:37:52,362 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:52,362 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:52,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 19:37:52,363 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:52,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:52,363 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-18 19:37:52,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:52,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1533939312] [2020-08-18 19:37:52,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:52,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:54,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:54,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:54,026 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 19:37:54,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1533939312] [2020-08-18 19:37:54,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:54,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 19:37:54,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942396653] [2020-08-18 19:37:54,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 19:37:54,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:54,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 19:37:54,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 19:37:54,029 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-18 19:37:54,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:54,268 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-18 19:37:54,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 19:37:54,269 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-18 19:37:54,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:54,270 INFO L225 Difference]: With dead ends: 114 [2020-08-18 19:37:54,270 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 19:37:54,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 19:37:54,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 19:37:54,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 19:37:54,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 19:37:54,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-18 19:37:54,276 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-18 19:37:54,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:54,277 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-18 19:37:54,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 19:37:54,277 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-18 19:37:54,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-18 19:37:54,278 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:54,278 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:54,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 19:37:54,279 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:54,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:54,279 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-18 19:37:54,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:54,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1942498817] [2020-08-18 19:37:54,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:54,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:55,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:55,688 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 19:37:55,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1942498817] [2020-08-18 19:37:55,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:55,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-18 19:37:55,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803658778] [2020-08-18 19:37:55,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-18 19:37:55,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:55,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-18 19:37:55,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-18 19:37:55,690 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-18 19:37:55,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:55,870 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-18 19:37:55,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-18 19:37:55,870 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-18 19:37:55,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:55,872 INFO L225 Difference]: With dead ends: 116 [2020-08-18 19:37:55,872 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 19:37:55,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-18 19:37:55,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 19:37:55,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-18 19:37:55,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 19:37:55,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-18 19:37:55,886 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-18 19:37:55,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:55,886 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-18 19:37:55,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-18 19:37:55,886 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-18 19:37:55,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-18 19:37:55,889 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:55,889 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:55,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-18 19:37:55,890 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:55,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:55,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-18 19:37:55,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:55,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370152843] [2020-08-18 19:37:55,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:55,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:57,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,231 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 19:37:57,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370152843] [2020-08-18 19:37:57,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:57,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-18 19:37:57,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184307160] [2020-08-18 19:37:57,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-18 19:37:57,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:57,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-18 19:37:57,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-18 19:37:57,233 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-18 19:37:57,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:57,435 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-18 19:37:57,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-18 19:37:57,435 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-18 19:37:57,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:57,437 INFO L225 Difference]: With dead ends: 118 [2020-08-18 19:37:57,437 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 19:37:57,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-18 19:37:57,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 19:37:57,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-18 19:37:57,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-18 19:37:57,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-18 19:37:57,442 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-18 19:37:57,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:57,442 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-18 19:37:57,442 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-18 19:37:57,443 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-18 19:37:57,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-18 19:37:57,443 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:57,443 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:57,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-18 19:37:57,444 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:57,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:57,444 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-18 19:37:57,444 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:57,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [747285803] [2020-08-18 19:37:57,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:57,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:58,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:58,825 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 19:37:58,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [747285803] [2020-08-18 19:37:58,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:58,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-18 19:37:58,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808971250] [2020-08-18 19:37:58,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-18 19:37:58,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:58,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-18 19:37:58,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-18 19:37:58,827 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-18 19:37:59,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:59,062 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-18 19:37:59,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-18 19:37:59,067 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-18 19:37:59,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:59,068 INFO L225 Difference]: With dead ends: 120 [2020-08-18 19:37:59,068 INFO L226 Difference]: Without dead ends: 114 [2020-08-18 19:37:59,069 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 19:37:59,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-18 19:37:59,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-18 19:37:59,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-18 19:37:59,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-18 19:37:59,072 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-18 19:37:59,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:59,072 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-18 19:37:59,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-18 19:37:59,073 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-18 19:37:59,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-18 19:37:59,074 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:59,074 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:59,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-18 19:37:59,074 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:59,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:59,075 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-18 19:37:59,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:59,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1699502856] [2020-08-18 19:37:59,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:59,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:00,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:00,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:00,528 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 19:38:00,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1699502856] [2020-08-18 19:38:00,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:00,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-18 19:38:00,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598924780] [2020-08-18 19:38:00,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-18 19:38:00,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:00,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-18 19:38:00,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-18 19:38:00,529 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-18 19:38:00,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:00,840 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-18 19:38:00,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-18 19:38:00,841 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-18 19:38:00,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:00,842 INFO L225 Difference]: With dead ends: 122 [2020-08-18 19:38:00,842 INFO L226 Difference]: Without dead ends: 116 [2020-08-18 19:38:00,843 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 19:38:00,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-18 19:38:00,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-18 19:38:00,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-18 19:38:00,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-18 19:38:00,846 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-18 19:38:00,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:00,847 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-18 19:38:00,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-18 19:38:00,847 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-18 19:38:00,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-18 19:38:00,848 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:00,848 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:00,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-18 19:38:00,848 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:00,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:00,849 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-18 19:38:00,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:00,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [308360530] [2020-08-18 19:38:00,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:00,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:02,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:02,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:02,399 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 19:38:02,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [308360530] [2020-08-18 19:38:02,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:02,400 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-18 19:38:02,400 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883036760] [2020-08-18 19:38:02,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-18 19:38:02,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:02,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-18 19:38:02,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-18 19:38:02,402 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-18 19:38:02,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:02,706 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-18 19:38:02,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-18 19:38:02,706 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-18 19:38:02,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:02,708 INFO L225 Difference]: With dead ends: 124 [2020-08-18 19:38:02,708 INFO L226 Difference]: Without dead ends: 118 [2020-08-18 19:38:02,709 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 19:38:02,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-18 19:38:02,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-18 19:38:02,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-18 19:38:02,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-18 19:38:02,713 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-18 19:38:02,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:02,714 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-18 19:38:02,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-18 19:38:02,714 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-18 19:38:02,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-18 19:38:02,715 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:02,715 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:02,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-18 19:38:02,715 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:02,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:02,716 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-18 19:38:02,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:02,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [22045305] [2020-08-18 19:38:02,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:02,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:04,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:04,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:04,306 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 19:38:04,306 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [22045305] [2020-08-18 19:38:04,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:04,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-18 19:38:04,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954792136] [2020-08-18 19:38:04,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-18 19:38:04,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:04,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-18 19:38:04,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-18 19:38:04,308 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-18 19:38:04,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:04,637 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-18 19:38:04,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-18 19:38:04,637 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-18 19:38:04,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:04,638 INFO L225 Difference]: With dead ends: 126 [2020-08-18 19:38:04,639 INFO L226 Difference]: Without dead ends: 120 [2020-08-18 19:38:04,639 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 19:38:04,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-18 19:38:04,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-18 19:38:04,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-18 19:38:04,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-18 19:38:04,642 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-18 19:38:04,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:04,643 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-18 19:38:04,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-18 19:38:04,643 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-18 19:38:04,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-18 19:38:04,643 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:04,644 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:04,644 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-18 19:38:04,644 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:04,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:04,644 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-18 19:38:04,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:04,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423313927] [2020-08-18 19:38:04,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:04,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:06,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:06,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:06,235 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 19:38:06,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423313927] [2020-08-18 19:38:06,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:06,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-18 19:38:06,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213655221] [2020-08-18 19:38:06,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-18 19:38:06,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:06,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-18 19:38:06,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-18 19:38:06,236 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-18 19:38:06,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:06,493 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-18 19:38:06,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-18 19:38:06,494 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-18 19:38:06,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:06,495 INFO L225 Difference]: With dead ends: 128 [2020-08-18 19:38:06,495 INFO L226 Difference]: Without dead ends: 122 [2020-08-18 19:38:06,495 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 19:38:06,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-18 19:38:06,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-18 19:38:06,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-18 19:38:06,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-18 19:38:06,500 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-18 19:38:06,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:06,500 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-18 19:38:06,500 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-18 19:38:06,500 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-18 19:38:06,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-18 19:38:06,501 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:06,501 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:06,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-18 19:38:06,501 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:06,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:06,502 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-18 19:38:06,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:06,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [260840786] [2020-08-18 19:38:06,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:06,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:08,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:08,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:08,325 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 19:38:08,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [260840786] [2020-08-18 19:38:08,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:08,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-18 19:38:08,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124806449] [2020-08-18 19:38:08,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-18 19:38:08,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:08,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-18 19:38:08,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-18 19:38:08,327 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-18 19:38:08,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:08,655 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-18 19:38:08,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-18 19:38:08,656 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-18 19:38:08,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:08,657 INFO L225 Difference]: With dead ends: 130 [2020-08-18 19:38:08,657 INFO L226 Difference]: Without dead ends: 124 [2020-08-18 19:38:08,658 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 19:38:08,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-18 19:38:08,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-18 19:38:08,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-18 19:38:08,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-18 19:38:08,662 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-18 19:38:08,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:08,663 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-18 19:38:08,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-18 19:38:08,663 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-18 19:38:08,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-18 19:38:08,664 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:08,664 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:08,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-18 19:38:08,664 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:08,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:08,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-18 19:38:08,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:08,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813508600] [2020-08-18 19:38:08,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:08,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:10,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:10,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:10,484 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 19:38:10,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813508600] [2020-08-18 19:38:10,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:10,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-18 19:38:10,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198059905] [2020-08-18 19:38:10,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-18 19:38:10,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:10,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-18 19:38:10,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-18 19:38:10,486 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-18 19:38:10,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:10,704 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-18 19:38:10,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-18 19:38:10,705 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-18 19:38:10,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:10,706 INFO L225 Difference]: With dead ends: 132 [2020-08-18 19:38:10,706 INFO L226 Difference]: Without dead ends: 126 [2020-08-18 19:38:10,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-18 19:38:10,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-18 19:38:10,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-18 19:38:10,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-18 19:38:10,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-18 19:38:10,710 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-18 19:38:10,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:10,710 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-18 19:38:10,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-18 19:38:10,710 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-18 19:38:10,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-18 19:38:10,711 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:10,711 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:10,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-18 19:38:10,711 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:10,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:10,712 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-18 19:38:10,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:10,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822806651] [2020-08-18 19:38:10,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:10,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:12,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:12,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:12,583 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 19:38:12,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822806651] [2020-08-18 19:38:12,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:12,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-18 19:38:12,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393230551] [2020-08-18 19:38:12,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-18 19:38:12,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:12,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-18 19:38:12,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-18 19:38:12,585 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-18 19:38:12,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:12,939 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-18 19:38:12,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-18 19:38:12,939 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-18 19:38:12,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:12,941 INFO L225 Difference]: With dead ends: 134 [2020-08-18 19:38:12,941 INFO L226 Difference]: Without dead ends: 128 [2020-08-18 19:38:12,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-18 19:38:12,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-18 19:38:12,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-18 19:38:12,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-18 19:38:12,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-18 19:38:12,945 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-18 19:38:12,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:12,945 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-18 19:38:12,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-18 19:38:12,945 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-18 19:38:12,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-18 19:38:12,946 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:12,946 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:12,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-18 19:38:12,946 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:12,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:12,946 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-18 19:38:12,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:12,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [977199563] [2020-08-18 19:38:12,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:12,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:14,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:14,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:14,805 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 19:38:14,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [977199563] [2020-08-18 19:38:14,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:14,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-18 19:38:14,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066620557] [2020-08-18 19:38:14,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-18 19:38:14,807 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:14,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-18 19:38:14,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-18 19:38:14,807 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-18 19:38:15,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:15,052 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-18 19:38:15,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-18 19:38:15,052 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-18 19:38:15,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:15,054 INFO L225 Difference]: With dead ends: 136 [2020-08-18 19:38:15,054 INFO L226 Difference]: Without dead ends: 130 [2020-08-18 19:38:15,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-18 19:38:15,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-18 19:38:15,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-18 19:38:15,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-18 19:38:15,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-18 19:38:15,058 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-18 19:38:15,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:15,058 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-18 19:38:15,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-18 19:38:15,058 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-18 19:38:15,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-18 19:38:15,059 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:15,059 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:15,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-18 19:38:15,059 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:15,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:15,060 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-18 19:38:15,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:15,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [136621629] [2020-08-18 19:38:15,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:15,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat