/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=NARROWEST -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 22:02:29,223 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:02:29,227 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:02:29,269 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 22:02:29,269 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 22:02:29,278 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 22:02:29,281 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 22:02:29,284 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 22:02:29,287 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 22:02:29,290 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 22:02:29,291 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 22:02:29,292 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 22:02:29,292 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:02:29,295 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:02:29,298 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:02:29,300 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:02:29,301 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:02:29,302 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:02:29,304 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:02:29,314 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:02:29,316 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:02:29,317 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:02:29,318 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:02:29,319 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:02:29,331 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 22:02:29,341 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:02:29,342 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:02:29,343 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:02:29,344 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 22:02:29,387 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:02:29,387 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:02:29,389 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:02:29,390 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:02:29,390 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:02:29,390 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:02:29,390 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:02:29,391 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:02:29,391 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:02:29,391 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:02:29,392 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:02:29,392 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:02:29,393 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:02:29,393 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:02:29,393 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:02:29,394 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:02:29,394 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:02:29,394 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:02:29,394 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:02:29,394 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:02:29,395 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:02:29,395 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:02:29,395 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:02:29,395 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:02:29,395 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:02:29,396 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:02:29,396 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:02:29,396 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:02:29,396 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:02:29,396 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=NARROWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; [2020-08-18 22:02:29,700 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:02:29,714 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:02:29,717 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:02:29,719 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:02:29,719 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:02:29,720 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-18 22:02:29,783 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/21cd6e081/236e5abcdae34498a3ee21504ae9bcfc/FLAG133240ad8 [2020-08-18 22:02:30,240 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:02:30,241 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-18 22:02:30,247 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/21cd6e081/236e5abcdae34498a3ee21504ae9bcfc/FLAG133240ad8 [2020-08-18 22:02:30,648 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/21cd6e081/236e5abcdae34498a3ee21504ae9bcfc [2020-08-18 22:02:30,656 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:02:30,658 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:02:30,659 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:02:30,659 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:02:30,662 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:02:30,663 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:02:30" (1/1) ... [2020-08-18 22:02:30,666 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ed69f49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:30, skipping insertion in model container [2020-08-18 22:02:30,667 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:02:30" (1/1) ... [2020-08-18 22:02:30,675 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:02:30,697 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:02:30,873 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:02:30,879 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:02:30,900 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:02:30,920 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:02:30,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:30 WrapperNode [2020-08-18 22:02:30,921 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:02:30,921 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:02:30,922 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:02:30,922 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:02:31,012 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:30" (1/1) ... [2020-08-18 22:02:31,012 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:30" (1/1) ... [2020-08-18 22:02:31,019 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:30" (1/1) ... [2020-08-18 22:02:31,019 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:30" (1/1) ... [2020-08-18 22:02:31,024 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:30" (1/1) ... [2020-08-18 22:02:31,028 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:30" (1/1) ... [2020-08-18 22:02:31,029 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:30" (1/1) ... [2020-08-18 22:02:31,031 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:02:31,031 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:02:31,031 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:02:31,032 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:02:31,032 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:30" (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 22:02:31,088 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:02:31,088 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:02:31,088 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 22:02:31,088 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:02:31,088 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:02:31,089 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 22:02:31,089 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:02:31,089 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 22:02:31,089 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 22:02:31,089 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 22:02:31,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 22:02:31,090 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:02:31,090 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:02:31,303 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:02:31,303 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 22:02:31,307 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:02:31 BoogieIcfgContainer [2020-08-18 22:02:31,308 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:02:31,309 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:02:31,309 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:02:31,313 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:02:31,313 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:02:30" (1/3) ... [2020-08-18 22:02:31,314 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26dafe32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:02:31, skipping insertion in model container [2020-08-18 22:02:31,315 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:30" (2/3) ... [2020-08-18 22:02:31,315 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26dafe32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:02:31, skipping insertion in model container [2020-08-18 22:02:31,315 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:02:31" (3/3) ... [2020-08-18 22:02:31,317 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-18 22:02:31,329 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:02:31,338 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:02:31,365 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:02:31,396 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:02:31,396 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:02:31,396 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:02:31,396 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:02:31,397 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:02:31,397 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:02:31,397 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:02:31,397 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:02:31,421 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-18 22:02:31,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 22:02:31,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:31,429 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:31,429 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:31,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:31,438 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-18 22:02:31,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:31,449 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1351794483] [2020-08-18 22:02:31,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:31,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:31,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:31,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:31,629 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 22:02:31,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1351794483] [2020-08-18 22:02:31,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:31,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 22:02:31,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741387703] [2020-08-18 22:02:31,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 22:02:31,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:31,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 22:02:31,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:02:31,658 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-18 22:02:31,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:31,727 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-18 22:02:31,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 22:02:31,732 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-18 22:02:31,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:31,739 INFO L225 Difference]: With dead ends: 34 [2020-08-18 22:02:31,740 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 22:02:31,743 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 22:02:31,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 22:02:31,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 22:02:31,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 22:02:31,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 22:02:31,776 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 22:02:31,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:31,777 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 22:02:31,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 22:02:31,777 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 22:02:31,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 22:02:31,778 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:31,778 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:31,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:02:31,779 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:31,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:31,779 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-18 22:02:31,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:31,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721536756] [2020-08-18 22:02:31,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:31,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:31,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:31,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:31,862 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 22:02:31,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721536756] [2020-08-18 22:02:31,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:31,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 22:02:31,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778633230] [2020-08-18 22:02:31,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:02:31,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:31,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:02:31,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:02:31,867 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-18 22:02:31,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:31,910 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 22:02:31,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 22:02:31,911 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 22:02:31,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:31,912 INFO L225 Difference]: With dead ends: 22 [2020-08-18 22:02:31,912 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 22:02:31,913 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 22:02:31,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 22:02:31,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-18 22:02:31,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 22:02:31,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 22:02:31,920 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-18 22:02:31,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:31,920 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 22:02:31,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:02:31,921 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 22:02:31,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 22:02:31,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:31,922 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:31,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:02:31,922 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:31,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:31,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-18 22:02:31,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:31,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052905533] [2020-08-18 22:02:31,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:31,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:31,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:31,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:31,991 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 22:02:31,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052905533] [2020-08-18 22:02:31,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:31,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 22:02:31,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000933555] [2020-08-18 22:02:31,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:02:31,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:31,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:02:31,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:02:31,994 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-18 22:02:32,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:32,040 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 22:02:32,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:02:32,041 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-18 22:02:32,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:32,042 INFO L225 Difference]: With dead ends: 24 [2020-08-18 22:02:32,042 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 22:02:32,043 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 22:02:32,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 22:02:32,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-18 22:02:32,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 22:02:32,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 22:02:32,050 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-18 22:02:32,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:32,051 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 22:02:32,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:02:32,052 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 22:02:32,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 22:02:32,053 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:32,053 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:32,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:02:32,054 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:32,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:32,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-18 22:02:32,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:32,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898068163] [2020-08-18 22:02:32,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:32,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:32,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,146 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 22:02:32,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898068163] [2020-08-18 22:02:32,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:32,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 22:02:32,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450273869] [2020-08-18 22:02:32,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 22:02:32,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:32,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 22:02:32,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:02:32,149 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-18 22:02:32,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:32,202 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 22:02:32,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:02:32,202 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-18 22:02:32,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:32,203 INFO L225 Difference]: With dead ends: 26 [2020-08-18 22:02:32,203 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 22:02:32,204 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 22:02:32,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 22:02:32,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-18 22:02:32,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 22:02:32,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 22:02:32,210 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-18 22:02:32,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:32,210 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 22:02:32,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 22:02:32,211 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 22:02:32,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 22:02:32,211 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:32,212 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:32,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:02:32,212 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:32,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:32,213 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-18 22:02:32,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:32,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437043427] [2020-08-18 22:02:32,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:32,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:32,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,312 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 22:02:32,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437043427] [2020-08-18 22:02:32,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:32,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:02:32,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709606638] [2020-08-18 22:02:32,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:02:32,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:32,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:02:32,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:02:32,316 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-18 22:02:32,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:32,376 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 22:02:32,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 22:02:32,377 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 22:02:32,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:32,378 INFO L225 Difference]: With dead ends: 28 [2020-08-18 22:02:32,378 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 22:02:32,389 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 22:02:32,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 22:02:32,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 22:02:32,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 22:02:32,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 22:02:32,394 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-18 22:02:32,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:32,395 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 22:02:32,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:02:32,395 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 22:02:32,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 22:02:32,396 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:32,396 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:32,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:02:32,397 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:32,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:32,397 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-18 22:02:32,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:32,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [446198888] [2020-08-18 22:02:32,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:32,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:32,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,495 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 22:02:32,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [446198888] [2020-08-18 22:02:32,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:32,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:02:32,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263361384] [2020-08-18 22:02:32,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:02:32,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:32,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:02:32,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:02:32,498 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-18 22:02:32,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:32,560 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 22:02:32,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 22:02:32,560 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-18 22:02:32,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:32,561 INFO L225 Difference]: With dead ends: 30 [2020-08-18 22:02:32,561 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 22:02:32,562 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 22:02:32,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 22:02:32,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 22:02:32,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 22:02:32,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 22:02:32,568 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-18 22:02:32,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:32,568 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 22:02:32,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:02:32,569 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 22:02:32,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 22:02:32,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:32,569 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:32,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:02:32,570 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:32,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:32,570 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-18 22:02:32,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:32,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [744587404] [2020-08-18 22:02:32,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:32,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:32,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,663 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 22:02:32,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [744587404] [2020-08-18 22:02:32,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:32,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:02:32,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429599661] [2020-08-18 22:02:32,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:02:32,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:32,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:02:32,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:02:32,666 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-18 22:02:32,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:32,730 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 22:02:32,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:02:32,731 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-18 22:02:32,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:32,732 INFO L225 Difference]: With dead ends: 32 [2020-08-18 22:02:32,732 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 22:02:32,732 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 22:02:32,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 22:02:32,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 22:02:32,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 22:02:32,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 22:02:32,738 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-18 22:02:32,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:32,739 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 22:02:32,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:02:32,739 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 22:02:32,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 22:02:32,740 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:32,740 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:32,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:02:32,741 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:32,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:32,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-18 22:02:32,741 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:32,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1671607938] [2020-08-18 22:02:32,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:32,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:32,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,845 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 22:02:32,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1671607938] [2020-08-18 22:02:32,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:32,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 22:02:32,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200735197] [2020-08-18 22:02:32,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 22:02:32,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:32,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 22:02:32,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:02:32,847 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-18 22:02:32,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:32,913 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 22:02:32,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:02:32,913 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-18 22:02:32,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:32,914 INFO L225 Difference]: With dead ends: 34 [2020-08-18 22:02:32,914 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 22:02:32,915 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 22:02:32,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 22:02:32,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 22:02:32,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 22:02:32,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 22:02:32,920 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-18 22:02:32,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:32,920 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 22:02:32,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 22:02:32,921 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 22:02:32,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 22:02:32,921 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:32,922 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:32,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:02:32,922 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:32,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:32,922 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-18 22:02:32,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:32,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140227679] [2020-08-18 22:02:32,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:32,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:33,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:33,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:33,029 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 22:02:33,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140227679] [2020-08-18 22:02:33,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:33,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 22:02:33,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249129647] [2020-08-18 22:02:33,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:02:33,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:33,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:02:33,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:02:33,031 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-18 22:02:33,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:33,098 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 22:02:33,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 22:02:33,099 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-18 22:02:33,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:33,099 INFO L225 Difference]: With dead ends: 36 [2020-08-18 22:02:33,100 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 22:02:33,100 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 22:02:33,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 22:02:33,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 22:02:33,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 22:02:33,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 22:02:33,105 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-18 22:02:33,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:33,106 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 22:02:33,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:02:33,106 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 22:02:33,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 22:02:33,107 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:33,107 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:33,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:02:33,107 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:33,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:33,108 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-18 22:02:33,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:33,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690385396] [2020-08-18 22:02:33,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:33,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:33,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:33,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:33,228 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 22:02:33,228 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690385396] [2020-08-18 22:02:33,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:33,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 22:02:33,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982794815] [2020-08-18 22:02:33,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 22:02:33,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:33,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 22:02:33,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:02:33,230 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-18 22:02:33,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:33,308 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 22:02:33,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 22:02:33,309 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-18 22:02:33,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:33,310 INFO L225 Difference]: With dead ends: 38 [2020-08-18 22:02:33,310 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 22:02:33,311 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 22:02:33,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 22:02:33,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 22:02:33,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 22:02:33,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 22:02:33,324 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-18 22:02:33,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:33,324 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 22:02:33,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 22:02:33,324 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 22:02:33,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 22:02:33,325 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:33,325 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:33,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:02:33,326 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:33,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:33,326 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-18 22:02:33,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:33,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2054604126] [2020-08-18 22:02:33,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:33,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:33,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:33,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:33,462 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 22:02:33,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2054604126] [2020-08-18 22:02:33,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:33,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:02:33,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567552473] [2020-08-18 22:02:33,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:02:33,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:33,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:02:33,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:02:33,464 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-18 22:02:33,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:33,533 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 22:02:33,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 22:02:33,534 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-18 22:02:33,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:33,535 INFO L225 Difference]: With dead ends: 40 [2020-08-18 22:02:33,535 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 22:02:33,536 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 22:02:33,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 22:02:33,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 22:02:33,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 22:02:33,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 22:02:33,540 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-18 22:02:33,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:33,541 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 22:02:33,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:02:33,541 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 22:02:33,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 22:02:33,542 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:33,542 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:33,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:02:33,543 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:33,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:33,543 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-18 22:02:33,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:33,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [752264060] [2020-08-18 22:02:33,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:33,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:33,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:33,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:33,683 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 22:02:33,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [752264060] [2020-08-18 22:02:33,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:33,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 22:02:33,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326491136] [2020-08-18 22:02:33,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 22:02:33,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:33,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 22:02:33,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:02:33,686 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-18 22:02:33,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:33,754 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 22:02:33,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 22:02:33,755 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-18 22:02:33,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:33,756 INFO L225 Difference]: With dead ends: 42 [2020-08-18 22:02:33,756 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 22:02:33,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:02:33,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 22:02:33,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 22:02:33,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 22:02:33,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 22:02:33,762 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-18 22:02:33,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:33,762 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 22:02:33,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 22:02:33,763 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 22:02:33,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 22:02:33,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:33,764 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:33,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 22:02:33,764 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:33,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:33,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-18 22:02:33,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:33,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1727910886] [2020-08-18 22:02:33,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:33,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:33,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:33,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:33,916 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 22:02:33,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1727910886] [2020-08-18 22:02:33,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:33,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 22:02:33,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080905886] [2020-08-18 22:02:33,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 22:02:33,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:33,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 22:02:33,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:02:33,918 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-18 22:02:34,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:34,003 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 22:02:34,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 22:02:34,004 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-18 22:02:34,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:34,004 INFO L225 Difference]: With dead ends: 44 [2020-08-18 22:02:34,005 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 22:02:34,005 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 22:02:34,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 22:02:34,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 22:02:34,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 22:02:34,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 22:02:34,010 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-18 22:02:34,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:34,010 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 22:02:34,011 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 22:02:34,011 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 22:02:34,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 22:02:34,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:34,012 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:34,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 22:02:34,012 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:34,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:34,013 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-18 22:02:34,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:34,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911655073] [2020-08-18 22:02:34,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:34,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:34,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:34,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:34,171 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 22:02:34,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911655073] [2020-08-18 22:02:34,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:34,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 22:02:34,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960802291] [2020-08-18 22:02:34,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 22:02:34,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:34,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 22:02:34,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:02:34,173 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-18 22:02:34,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:34,246 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 22:02:34,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 22:02:34,247 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-18 22:02:34,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:34,248 INFO L225 Difference]: With dead ends: 46 [2020-08-18 22:02:34,248 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 22:02:34,249 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 22:02:34,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 22:02:34,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 22:02:34,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 22:02:34,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 22:02:34,254 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-18 22:02:34,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:34,254 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 22:02:34,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 22:02:34,255 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 22:02:34,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 22:02:34,256 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:34,256 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:34,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 22:02:34,256 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:34,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:34,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-18 22:02:34,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:34,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706145795] [2020-08-18 22:02:34,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:34,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:34,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:34,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:34,433 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 22:02:34,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706145795] [2020-08-18 22:02:34,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:34,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 22:02:34,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62322187] [2020-08-18 22:02:34,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 22:02:34,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:34,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 22:02:34,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:02:34,436 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-18 22:02:34,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:34,540 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 22:02:34,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 22:02:34,541 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-18 22:02:34,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:34,542 INFO L225 Difference]: With dead ends: 48 [2020-08-18 22:02:34,542 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 22:02:34,542 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 22:02:34,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 22:02:34,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 22:02:34,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 22:02:34,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 22:02:34,547 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-18 22:02:34,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:34,547 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 22:02:34,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 22:02:34,548 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 22:02:34,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 22:02:34,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:34,549 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:34,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 22:02:34,549 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:34,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:34,550 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-18 22:02:34,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:34,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1796095291] [2020-08-18 22:02:34,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:34,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:34,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:34,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:34,792 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 22:02:34,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1796095291] [2020-08-18 22:02:34,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:34,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 22:02:34,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23471712] [2020-08-18 22:02:34,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 22:02:34,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:34,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 22:02:34,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:02:34,796 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-18 22:02:34,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:34,922 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 22:02:34,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 22:02:34,922 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-18 22:02:34,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:34,923 INFO L225 Difference]: With dead ends: 50 [2020-08-18 22:02:34,923 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 22:02:34,924 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 22:02:34,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 22:02:34,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 22:02:34,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 22:02:34,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 22:02:34,929 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-18 22:02:34,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:34,929 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 22:02:34,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 22:02:34,929 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 22:02:34,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 22:02:34,930 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:34,930 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:34,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 22:02:34,930 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:34,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:34,931 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-18 22:02:34,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:34,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [653636093] [2020-08-18 22:02:34,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:34,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:35,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:35,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:35,124 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 22:02:35,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [653636093] [2020-08-18 22:02:35,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:35,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 22:02:35,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840451763] [2020-08-18 22:02:35,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 22:02:35,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:35,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 22:02:35,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:02:35,127 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-18 22:02:35,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:35,249 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 22:02:35,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 22:02:35,249 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-18 22:02:35,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:35,250 INFO L225 Difference]: With dead ends: 52 [2020-08-18 22:02:35,251 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 22:02:35,252 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 22:02:35,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 22:02:35,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 22:02:35,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 22:02:35,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 22:02:35,256 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-18 22:02:35,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:35,257 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 22:02:35,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 22:02:35,257 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 22:02:35,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 22:02:35,258 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:35,258 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:35,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 22:02:35,258 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:35,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:35,259 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-18 22:02:35,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:35,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1424710225] [2020-08-18 22:02:35,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:35,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:35,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:35,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:35,502 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 22:02:35,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1424710225] [2020-08-18 22:02:35,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:35,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 22:02:35,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995205489] [2020-08-18 22:02:35,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 22:02:35,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:35,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 22:02:35,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:02:35,505 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-18 22:02:35,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:35,614 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 22:02:35,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 22:02:35,614 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-18 22:02:35,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:35,616 INFO L225 Difference]: With dead ends: 54 [2020-08-18 22:02:35,616 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 22:02:35,617 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:02:35,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 22:02:35,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-18 22:02:35,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 22:02:35,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 22:02:35,622 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-18 22:02:35,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:35,622 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 22:02:35,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 22:02:35,622 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 22:02:35,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 22:02:35,623 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:35,623 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:35,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 22:02:35,623 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:35,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:35,624 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-18 22:02:35,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:35,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [991244605] [2020-08-18 22:02:35,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:35,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:35,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:35,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:35,873 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 22:02:35,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [991244605] [2020-08-18 22:02:35,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:35,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 22:02:35,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204798507] [2020-08-18 22:02:35,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 22:02:35,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:35,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 22:02:35,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:02:35,876 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-18 22:02:35,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:35,986 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 22:02:35,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 22:02:35,987 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-18 22:02:35,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:35,988 INFO L225 Difference]: With dead ends: 56 [2020-08-18 22:02:35,988 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 22:02:35,989 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 22:02:35,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 22:02:35,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-18 22:02:35,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 22:02:35,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 22:02:35,994 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-18 22:02:35,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:35,994 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 22:02:35,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 22:02:35,995 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 22:02:35,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 22:02:35,995 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:35,996 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:35,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 22:02:35,996 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:35,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:35,996 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-18 22:02:35,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:35,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120969403] [2020-08-18 22:02:35,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:36,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:36,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:36,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:36,257 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 22:02:36,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120969403] [2020-08-18 22:02:36,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:36,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 22:02:36,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455193957] [2020-08-18 22:02:36,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 22:02:36,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:36,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 22:02:36,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:02:36,259 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-18 22:02:36,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:36,360 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 22:02:36,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 22:02:36,361 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-18 22:02:36,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:36,362 INFO L225 Difference]: With dead ends: 58 [2020-08-18 22:02:36,362 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 22:02:36,362 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 22:02:36,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 22:02:36,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 22:02:36,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 22:02:36,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 22:02:36,367 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-18 22:02:36,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:36,367 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 22:02:36,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 22:02:36,367 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 22:02:36,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 22:02:36,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:36,368 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:36,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 22:02:36,369 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:36,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:36,369 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-18 22:02:36,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:36,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017683288] [2020-08-18 22:02:36,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:36,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:36,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:36,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:36,663 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 22:02:36,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017683288] [2020-08-18 22:02:36,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:36,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 22:02:36,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846098456] [2020-08-18 22:02:36,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 22:02:36,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:36,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 22:02:36,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:02:36,667 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-18 22:02:36,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:36,800 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 22:02:36,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 22:02:36,800 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-18 22:02:36,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:36,802 INFO L225 Difference]: With dead ends: 60 [2020-08-18 22:02:36,802 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 22:02:36,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:02:36,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 22:02:36,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 22:02:36,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 22:02:36,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 22:02:36,811 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-18 22:02:36,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:36,812 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 22:02:36,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 22:02:36,812 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 22:02:36,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 22:02:36,812 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:36,813 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:36,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 22:02:36,813 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:36,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:36,814 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-18 22:02:36,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:36,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [652394228] [2020-08-18 22:02:36,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:36,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:37,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:37,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:37,206 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:37,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [652394228] [2020-08-18 22:02:37,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:37,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 22:02:37,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223202196] [2020-08-18 22:02:37,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 22:02:37,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:37,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 22:02:37,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:02:37,209 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-18 22:02:37,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:37,300 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 22:02:37,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 22:02:37,302 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-18 22:02:37,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:37,303 INFO L225 Difference]: With dead ends: 62 [2020-08-18 22:02:37,303 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 22:02:37,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:02:37,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 22:02:37,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 22:02:37,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 22:02:37,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 22:02:37,307 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-18 22:02:37,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:37,308 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 22:02:37,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 22:02:37,308 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 22:02:37,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 22:02:37,308 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:37,309 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:37,310 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 22:02:37,310 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:37,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:37,315 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-18 22:02:37,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:37,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667921340] [2020-08-18 22:02:37,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:37,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:37,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:37,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:37,694 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 22:02:37,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667921340] [2020-08-18 22:02:37,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:37,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 22:02:37,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086914275] [2020-08-18 22:02:37,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 22:02:37,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:37,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 22:02:37,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:02:37,696 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-18 22:02:37,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:37,837 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 22:02:37,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 22:02:37,837 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-18 22:02:37,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:37,838 INFO L225 Difference]: With dead ends: 64 [2020-08-18 22:02:37,838 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 22:02:37,839 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:02:37,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 22:02:37,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 22:02:37,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 22:02:37,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 22:02:37,842 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-18 22:02:37,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:37,843 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 22:02:37,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 22:02:37,843 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 22:02:37,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 22:02:37,844 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:37,844 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:37,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 22:02:37,844 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:37,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:37,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-18 22:02:37,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:37,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [377002432] [2020-08-18 22:02:37,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:37,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:38,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,159 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 22:02:38,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [377002432] [2020-08-18 22:02:38,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:38,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 22:02:38,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797864705] [2020-08-18 22:02:38,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 22:02:38,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:38,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 22:02:38,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:02:38,161 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-18 22:02:38,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:38,321 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-18 22:02:38,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 22:02:38,322 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-18 22:02:38,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:38,323 INFO L225 Difference]: With dead ends: 66 [2020-08-18 22:02:38,323 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 22:02:38,324 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 22:02:38,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 22:02:38,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 22:02:38,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 22:02:38,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 22:02:38,328 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-18 22:02:38,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:38,329 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 22:02:38,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 22:02:38,329 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 22:02:38,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 22:02:38,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:38,330 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:38,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 22:02:38,330 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:38,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:38,331 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-18 22:02:38,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:38,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [576733137] [2020-08-18 22:02:38,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:38,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:38,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,700 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 22:02:38,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [576733137] [2020-08-18 22:02:38,701 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:38,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 22:02:38,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397018007] [2020-08-18 22:02:38,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 22:02:38,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:38,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 22:02:38,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:02:38,702 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-18 22:02:38,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:38,876 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-18 22:02:38,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 22:02:38,876 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-18 22:02:38,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:38,877 INFO L225 Difference]: With dead ends: 68 [2020-08-18 22:02:38,877 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 22:02:38,878 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 22:02:38,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 22:02:38,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 22:02:38,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 22:02:38,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-18 22:02:38,882 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-18 22:02:38,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:38,883 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-18 22:02:38,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 22:02:38,883 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-18 22:02:38,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 22:02:38,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:38,884 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:38,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 22:02:38,884 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:38,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:38,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-18 22:02:38,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:38,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506241936] [2020-08-18 22:02:38,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:38,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:39,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:39,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:39,271 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 22:02:39,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506241936] [2020-08-18 22:02:39,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:39,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 22:02:39,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261275093] [2020-08-18 22:02:39,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 22:02:39,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:39,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 22:02:39,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:02:39,275 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-18 22:02:39,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:39,459 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-18 22:02:39,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 22:02:39,459 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-18 22:02:39,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:39,460 INFO L225 Difference]: With dead ends: 70 [2020-08-18 22:02:39,460 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 22:02:39,461 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 22:02:39,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 22:02:39,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 22:02:39,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 22:02:39,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-18 22:02:39,467 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-18 22:02:39,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:39,468 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-18 22:02:39,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 22:02:39,468 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-18 22:02:39,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 22:02:39,469 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:39,471 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:39,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 22:02:39,472 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:39,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:39,473 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-18 22:02:39,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:39,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974011241] [2020-08-18 22:02:39,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:39,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:39,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:39,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:39,941 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 22:02:39,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974011241] [2020-08-18 22:02:39,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:39,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 22:02:39,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070240092] [2020-08-18 22:02:39,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 22:02:39,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:39,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 22:02:39,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:02:39,944 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-18 22:02:40,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:40,147 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-18 22:02:40,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 22:02:40,148 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-18 22:02:40,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:40,149 INFO L225 Difference]: With dead ends: 72 [2020-08-18 22:02:40,149 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 22:02:40,150 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 22:02:40,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 22:02:40,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 22:02:40,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 22:02:40,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-18 22:02:40,155 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-18 22:02:40,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:40,155 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-18 22:02:40,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 22:02:40,155 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-18 22:02:40,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 22:02:40,156 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:40,156 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:40,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 22:02:40,157 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:40,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:40,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-18 22:02:40,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:40,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876487954] [2020-08-18 22:02:40,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:40,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:40,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:40,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:40,646 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 22:02:40,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876487954] [2020-08-18 22:02:40,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:40,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 22:02:40,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306241244] [2020-08-18 22:02:40,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 22:02:40,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:40,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 22:02:40,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:02:40,648 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-18 22:02:40,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:40,818 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-18 22:02:40,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 22:02:40,819 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-18 22:02:40,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:40,820 INFO L225 Difference]: With dead ends: 74 [2020-08-18 22:02:40,820 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 22:02:40,821 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 22:02:40,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 22:02:40,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 22:02:40,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 22:02:40,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-18 22:02:40,824 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-18 22:02:40,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:40,825 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-18 22:02:40,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 22:02:40,825 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-18 22:02:40,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 22:02:40,826 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:40,826 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:40,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 22:02:40,826 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:40,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:40,826 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-18 22:02:40,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:40,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007192334] [2020-08-18 22:02:40,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:40,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:41,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:41,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:41,399 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 22:02:41,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2007192334] [2020-08-18 22:02:41,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:41,400 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 22:02:41,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616245439] [2020-08-18 22:02:41,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 22:02:41,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:41,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 22:02:41,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:02:41,403 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-18 22:02:41,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:41,633 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-18 22:02:41,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 22:02:41,634 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-18 22:02:41,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:41,635 INFO L225 Difference]: With dead ends: 76 [2020-08-18 22:02:41,635 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 22:02:41,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:02:41,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 22:02:41,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 22:02:41,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 22:02:41,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-18 22:02:41,640 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-18 22:02:41,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:41,641 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-18 22:02:41,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 22:02:41,641 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-18 22:02:41,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 22:02:41,642 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:41,643 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:41,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 22:02:41,643 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:41,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:41,643 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-18 22:02:41,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:41,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126239572] [2020-08-18 22:02:41,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:41,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:42,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:42,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:42,253 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:42,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126239572] [2020-08-18 22:02:42,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:42,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 22:02:42,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281181409] [2020-08-18 22:02:42,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 22:02:42,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:42,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 22:02:42,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:02:42,255 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-18 22:02:42,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:42,419 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-18 22:02:42,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 22:02:42,419 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-18 22:02:42,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:42,420 INFO L225 Difference]: With dead ends: 78 [2020-08-18 22:02:42,420 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 22:02:42,421 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 22:02:42,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 22:02:42,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 22:02:42,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 22:02:42,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-18 22:02:42,425 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-18 22:02:42,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:42,425 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-18 22:02:42,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 22:02:42,426 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-18 22:02:42,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 22:02:42,426 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:42,426 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:42,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 22:02:42,427 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:42,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:42,427 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-18 22:02:42,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:42,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407465477] [2020-08-18 22:02:42,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:42,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:43,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:43,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:43,033 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 22:02:43,033 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407465477] [2020-08-18 22:02:43,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:43,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 22:02:43,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673186682] [2020-08-18 22:02:43,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 22:02:43,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:43,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 22:02:43,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:02:43,036 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-18 22:02:43,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:43,243 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-18 22:02:43,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 22:02:43,244 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-18 22:02:43,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:43,245 INFO L225 Difference]: With dead ends: 80 [2020-08-18 22:02:43,245 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 22:02:43,246 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:02:43,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 22:02:43,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 22:02:43,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 22:02:43,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-18 22:02:43,249 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-18 22:02:43,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:43,249 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-18 22:02:43,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 22:02:43,249 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-18 22:02:43,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 22:02:43,252 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:43,252 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:43,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 22:02:43,254 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:43,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:43,254 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-18 22:02:43,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:43,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [695988920] [2020-08-18 22:02:43,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:43,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:43,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:43,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:43,879 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 22:02:43,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [695988920] [2020-08-18 22:02:43,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:43,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 22:02:43,881 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139467694] [2020-08-18 22:02:43,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 22:02:43,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:43,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 22:02:43,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:02:43,883 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-18 22:02:44,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:44,069 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-18 22:02:44,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 22:02:44,069 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-18 22:02:44,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:44,070 INFO L225 Difference]: With dead ends: 82 [2020-08-18 22:02:44,070 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 22:02:44,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:02:44,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 22:02:44,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 22:02:44,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 22:02:44,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-18 22:02:44,075 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-18 22:02:44,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:44,076 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-18 22:02:44,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 22:02:44,076 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-18 22:02:44,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 22:02:44,076 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:44,077 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:44,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 22:02:44,077 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:44,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:44,077 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-18 22:02:44,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:44,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [943103478] [2020-08-18 22:02:44,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:44,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:44,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:44,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:44,765 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 22:02:44,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [943103478] [2020-08-18 22:02:44,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:44,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 22:02:44,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009017984] [2020-08-18 22:02:44,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 22:02:44,767 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:44,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 22:02:44,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:02:44,768 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-18 22:02:45,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:45,012 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-18 22:02:45,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 22:02:45,012 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-18 22:02:45,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:45,013 INFO L225 Difference]: With dead ends: 84 [2020-08-18 22:02:45,013 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 22:02:45,014 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:02:45,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 22:02:45,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 22:02:45,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 22:02:45,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-18 22:02:45,018 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-18 22:02:45,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:45,018 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-18 22:02:45,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 22:02:45,018 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-18 22:02:45,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 22:02:45,019 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:45,019 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:45,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 22:02:45,020 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:45,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:45,020 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-18 22:02:45,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:45,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1271129354] [2020-08-18 22:02:45,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:45,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:45,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:45,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:45,709 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 22:02:45,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1271129354] [2020-08-18 22:02:45,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:45,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 22:02:45,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552683700] [2020-08-18 22:02:45,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 22:02:45,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:45,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 22:02:45,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:02:45,712 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-18 22:02:45,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:45,881 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-18 22:02:45,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 22:02:45,882 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-18 22:02:45,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:45,883 INFO L225 Difference]: With dead ends: 86 [2020-08-18 22:02:45,883 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 22:02:45,884 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 22:02:45,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 22:02:45,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 22:02:45,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 22:02:45,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-18 22:02:45,890 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-18 22:02:45,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:45,891 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-18 22:02:45,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 22:02:45,891 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-18 22:02:45,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 22:02:45,892 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:45,892 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:45,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 22:02:45,892 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:45,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:45,892 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-18 22:02:45,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:45,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [75017176] [2020-08-18 22:02:45,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:45,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:46,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:46,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:46,612 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 22:02:46,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [75017176] [2020-08-18 22:02:46,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:46,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 22:02:46,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050551502] [2020-08-18 22:02:46,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 22:02:46,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:46,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 22:02:46,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:02:46,617 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-18 22:02:46,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:46,853 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-18 22:02:46,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 22:02:46,853 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-18 22:02:46,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:46,854 INFO L225 Difference]: With dead ends: 88 [2020-08-18 22:02:46,854 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 22:02:46,855 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 22:02:46,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 22:02:46,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 22:02:46,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 22:02:46,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-18 22:02:46,860 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-18 22:02:46,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:46,860 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-18 22:02:46,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 22:02:46,860 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-18 22:02:46,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 22:02:46,861 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:46,861 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:46,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 22:02:46,862 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:46,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:46,862 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-18 22:02:46,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:46,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947571887] [2020-08-18 22:02:46,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:46,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:47,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:47,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:47,657 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 22:02:47,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947571887] [2020-08-18 22:02:47,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:47,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 22:02:47,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991402678] [2020-08-18 22:02:47,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 22:02:47,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:47,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 22:02:47,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:02:47,660 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-18 22:02:47,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:47,836 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-18 22:02:47,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 22:02:47,837 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-18 22:02:47,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:47,838 INFO L225 Difference]: With dead ends: 90 [2020-08-18 22:02:47,838 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 22:02:47,840 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 22:02:47,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 22:02:47,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 22:02:47,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 22:02:47,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-18 22:02:47,843 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-18 22:02:47,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:47,844 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-18 22:02:47,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 22:02:47,844 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-18 22:02:47,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 22:02:47,845 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:47,845 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:47,845 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 22:02:47,845 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:47,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:47,845 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-18 22:02:47,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:47,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846787716] [2020-08-18 22:02:47,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:47,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:48,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:48,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:48,655 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 22:02:48,656 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846787716] [2020-08-18 22:02:48,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:48,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 22:02:48,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439504380] [2020-08-18 22:02:48,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 22:02:48,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:48,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 22:02:48,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:02:48,659 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-18 22:02:48,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:48,802 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-18 22:02:48,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 22:02:48,803 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-18 22:02:48,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:48,804 INFO L225 Difference]: With dead ends: 92 [2020-08-18 22:02:48,804 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 22:02:48,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:02:48,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 22:02:48,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 22:02:48,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 22:02:48,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-18 22:02:48,810 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-18 22:02:48,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:48,810 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-18 22:02:48,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 22:02:48,810 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-18 22:02:48,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 22:02:48,811 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:48,811 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:48,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 22:02:48,812 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:48,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:48,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-18 22:02:48,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:48,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921139721] [2020-08-18 22:02:48,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:48,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:49,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:49,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:49,637 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 22:02:49,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921139721] [2020-08-18 22:02:49,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:49,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 22:02:49,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330310009] [2020-08-18 22:02:49,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 22:02:49,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:49,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 22:02:49,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:02:49,640 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-18 22:02:49,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:49,883 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-18 22:02:49,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 22:02:49,886 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-18 22:02:49,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:49,887 INFO L225 Difference]: With dead ends: 94 [2020-08-18 22:02:49,887 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 22:02:49,888 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 22:02:49,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 22:02:49,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 22:02:49,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 22:02:49,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-18 22:02:49,895 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-18 22:02:49,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:49,895 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-18 22:02:49,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 22:02:49,895 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-18 22:02:49,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 22:02:49,896 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:49,896 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:49,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 22:02:49,897 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:49,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:49,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-18 22:02:49,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:49,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1229311306] [2020-08-18 22:02:49,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:49,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:50,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:50,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:50,826 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 22:02:50,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1229311306] [2020-08-18 22:02:50,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:50,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 22:02:50,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889011017] [2020-08-18 22:02:50,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 22:02:50,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:50,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 22:02:50,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:02:50,828 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-18 22:02:51,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:51,094 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-18 22:02:51,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 22:02:51,094 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-18 22:02:51,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:51,096 INFO L225 Difference]: With dead ends: 96 [2020-08-18 22:02:51,096 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 22:02:51,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:02:51,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 22:02:51,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 22:02:51,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 22:02:51,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-18 22:02:51,101 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-18 22:02:51,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:51,101 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-18 22:02:51,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 22:02:51,102 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-18 22:02:51,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 22:02:51,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:51,103 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:51,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 22:02:51,103 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:51,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:51,103 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-18 22:02:51,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:51,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660723261] [2020-08-18 22:02:51,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:51,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:52,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:52,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:52,072 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 22:02:52,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660723261] [2020-08-18 22:02:52,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:52,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 22:02:52,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569023661] [2020-08-18 22:02:52,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 22:02:52,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:52,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 22:02:52,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 22:02:52,074 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-18 22:02:52,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:52,330 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-18 22:02:52,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 22:02:52,331 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-18 22:02:52,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:52,332 INFO L225 Difference]: With dead ends: 98 [2020-08-18 22:02:52,332 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 22:02:52,333 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 22:02:52,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 22:02:52,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 22:02:52,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 22:02:52,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-18 22:02:52,337 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-18 22:02:52,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:52,338 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-18 22:02:52,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 22:02:52,338 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-18 22:02:52,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 22:02:52,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:52,339 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:52,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 22:02:52,339 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:52,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:52,340 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-18 22:02:52,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:52,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [865859043] [2020-08-18 22:02:52,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:52,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:53,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:53,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:53,334 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 22:02:53,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [865859043] [2020-08-18 22:02:53,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:53,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 22:02:53,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098905423] [2020-08-18 22:02:53,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 22:02:53,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:53,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 22:02:53,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 22:02:53,336 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-18 22:02:53,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:53,593 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-18 22:02:53,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 22:02:53,594 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-18 22:02:53,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:53,595 INFO L225 Difference]: With dead ends: 100 [2020-08-18 22:02:53,595 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 22:02:53,596 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 22:02:53,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 22:02:53,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 22:02:53,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 22:02:53,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-18 22:02:53,600 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-18 22:02:53,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:53,600 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-18 22:02:53,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 22:02:53,601 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-18 22:02:53,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 22:02:53,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:53,602 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:53,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 22:02:53,602 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:53,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:53,603 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-18 22:02:53,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:53,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1097552301] [2020-08-18 22:02:53,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:53,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:54,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:54,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:54,699 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 22:02:54,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1097552301] [2020-08-18 22:02:54,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:54,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 22:02:54,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366448224] [2020-08-18 22:02:54,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 22:02:54,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:54,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 22:02:54,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 22:02:54,701 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-18 22:02:54,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:54,896 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-18 22:02:54,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 22:02:54,897 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-18 22:02:54,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:54,900 INFO L225 Difference]: With dead ends: 102 [2020-08-18 22:02:54,900 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 22:02:54,901 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 22:02:54,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 22:02:54,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 22:02:54,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 22:02:54,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-18 22:02:54,905 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-18 22:02:54,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:54,906 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-18 22:02:54,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 22:02:54,906 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-18 22:02:54,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 22:02:54,907 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:54,907 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:54,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 22:02:54,907 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:54,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:54,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-18 22:02:54,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:54,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [794780947] [2020-08-18 22:02:54,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:54,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:56,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:56,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:56,015 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 22:02:56,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [794780947] [2020-08-18 22:02:56,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:56,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 22:02:56,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698281706] [2020-08-18 22:02:56,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 22:02:56,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:56,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 22:02:56,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 22:02:56,017 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-18 22:02:56,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:56,261 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-18 22:02:56,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 22:02:56,265 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-18 22:02:56,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:56,266 INFO L225 Difference]: With dead ends: 104 [2020-08-18 22:02:56,266 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 22:02:56,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 22:02:56,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 22:02:56,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 22:02:56,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 22:02:56,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-18 22:02:56,271 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-18 22:02:56,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:56,271 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-18 22:02:56,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 22:02:56,272 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-18 22:02:56,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 22:02:56,272 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:56,272 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:56,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 22:02:56,273 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:56,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:56,273 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-18 22:02:56,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:56,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1539066233] [2020-08-18 22:02:56,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:56,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:57,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:57,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:57,402 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 22:02:57,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1539066233] [2020-08-18 22:02:57,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:57,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 22:02:57,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108319900] [2020-08-18 22:02:57,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 22:02:57,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:57,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 22:02:57,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 22:02:57,405 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-18 22:02:57,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:57,573 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-18 22:02:57,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 22:02:57,574 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-18 22:02:57,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:57,575 INFO L225 Difference]: With dead ends: 106 [2020-08-18 22:02:57,575 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 22:02:57,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 22:02:57,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 22:02:57,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 22:02:57,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 22:02:57,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-18 22:02:57,580 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-18 22:02:57,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:57,580 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-18 22:02:57,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 22:02:57,580 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-18 22:02:57,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 22:02:57,581 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:57,581 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:57,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 22:02:57,582 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:57,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:57,582 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-18 22:02:57,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:57,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [379460257] [2020-08-18 22:02:57,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:57,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:58,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:58,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:58,746 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 22:02:58,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [379460257] [2020-08-18 22:02:58,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:58,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 22:02:58,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222804936] [2020-08-18 22:02:58,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 22:02:58,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:58,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 22:02:58,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 22:02:58,748 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-18 22:02:59,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:59,039 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-18 22:02:59,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 22:02:59,040 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-18 22:02:59,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:59,041 INFO L225 Difference]: With dead ends: 108 [2020-08-18 22:02:59,041 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 22:02:59,042 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 22:02:59,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 22:02:59,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 22:02:59,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 22:02:59,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-18 22:02:59,046 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-18 22:02:59,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:59,046 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-18 22:02:59,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 22:02:59,046 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-18 22:02:59,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 22:02:59,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:59,047 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:59,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 22:02:59,047 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:59,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:59,048 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-18 22:02:59,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:59,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [105863141] [2020-08-18 22:02:59,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:59,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:00,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,210 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 22:03:00,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [105863141] [2020-08-18 22:03:00,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:00,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 22:03:00,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223461293] [2020-08-18 22:03:00,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 22:03:00,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:00,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 22:03:00,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 22:03:00,214 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-18 22:03:00,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:00,438 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-18 22:03:00,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 22:03:00,439 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-18 22:03:00,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:00,440 INFO L225 Difference]: With dead ends: 110 [2020-08-18 22:03:00,440 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 22:03:00,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 22:03:00,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 22:03:00,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 22:03:00,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 22:03:00,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-18 22:03:00,445 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-18 22:03:00,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:00,445 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-18 22:03:00,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 22:03:00,446 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-18 22:03:00,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 22:03:00,446 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:00,446 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:00,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 22:03:00,447 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:00,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:00,447 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-18 22:03:00,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:00,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1186397194] [2020-08-18 22:03:00,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:00,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:01,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:01,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:01,736 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 22:03:01,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1186397194] [2020-08-18 22:03:01,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:01,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 22:03:01,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071127700] [2020-08-18 22:03:01,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 22:03:01,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:01,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 22:03:01,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 22:03:01,738 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-18 22:03:01,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:01,931 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-18 22:03:01,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 22:03:01,932 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-18 22:03:01,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:01,933 INFO L225 Difference]: With dead ends: 112 [2020-08-18 22:03:01,933 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 22:03:01,934 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 22:03:01,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 22:03:01,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 22:03:01,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 22:03:01,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-18 22:03:01,938 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-18 22:03:01,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:01,938 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-18 22:03:01,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 22:03:01,938 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-18 22:03:01,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-18 22:03:01,939 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:01,939 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:01,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 22:03:01,940 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:01,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:01,940 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-18 22:03:01,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:01,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [886727224] [2020-08-18 22:03:01,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:01,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:03,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:03,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:03,251 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 22:03:03,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [886727224] [2020-08-18 22:03:03,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:03,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 22:03:03,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40981742] [2020-08-18 22:03:03,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 22:03:03,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:03,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 22:03:03,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 22:03:03,253 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-18 22:03:03,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:03,450 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-18 22:03:03,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 22:03:03,451 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-18 22:03:03,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:03,452 INFO L225 Difference]: With dead ends: 114 [2020-08-18 22:03:03,453 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 22:03:03,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 22:03:03,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 22:03:03,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 22:03:03,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 22:03:03,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-18 22:03:03,459 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-18 22:03:03,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:03,459 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-18 22:03:03,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 22:03:03,459 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-18 22:03:03,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-18 22:03:03,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:03,460 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:03,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 22:03:03,461 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:03,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:03,461 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-18 22:03:03,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:03,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99497940] [2020-08-18 22:03:03,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:03,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:04,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,863 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 22:03:04,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99497940] [2020-08-18 22:03:04,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:04,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-18 22:03:04,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896101056] [2020-08-18 22:03:04,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-18 22:03:04,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:04,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-18 22:03:04,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-18 22:03:04,865 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-18 22:03:05,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:05,068 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-18 22:03:05,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-18 22:03:05,069 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-18 22:03:05,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:05,070 INFO L225 Difference]: With dead ends: 116 [2020-08-18 22:03:05,070 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 22:03:05,071 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 22:03:05,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 22:03:05,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-18 22:03:05,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 22:03:05,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-18 22:03:05,076 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-18 22:03:05,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:05,076 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-18 22:03:05,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-18 22:03:05,077 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-18 22:03:05,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-18 22:03:05,077 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:05,078 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:05,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-18 22:03:05,078 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:05,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:05,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-18 22:03:05,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:05,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984651021] [2020-08-18 22:03:05,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:05,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:06,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:06,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:06,559 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 22:03:06,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984651021] [2020-08-18 22:03:06,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:06,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-18 22:03:06,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121606542] [2020-08-18 22:03:06,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-18 22:03:06,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:06,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-18 22:03:06,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-18 22:03:06,561 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-18 22:03:06,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:06,785 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-18 22:03:06,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-18 22:03:06,786 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-18 22:03:06,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:06,787 INFO L225 Difference]: With dead ends: 118 [2020-08-18 22:03:06,787 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 22:03:06,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-18 22:03:06,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 22:03:06,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-18 22:03:06,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-18 22:03:06,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-18 22:03:06,793 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-18 22:03:06,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:06,793 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-18 22:03:06,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-18 22:03:06,794 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-18 22:03:06,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-18 22:03:06,794 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:06,794 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:06,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-18 22:03:06,795 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:06,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:06,795 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-18 22:03:06,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:06,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [43047364] [2020-08-18 22:03:06,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:06,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:08,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:08,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:08,319 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 22:03:08,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [43047364] [2020-08-18 22:03:08,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:08,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-18 22:03:08,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95847919] [2020-08-18 22:03:08,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-18 22:03:08,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:08,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-18 22:03:08,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-18 22:03:08,321 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-18 22:03:08,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:08,565 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-18 22:03:08,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-18 22:03:08,567 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-18 22:03:08,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:08,569 INFO L225 Difference]: With dead ends: 120 [2020-08-18 22:03:08,569 INFO L226 Difference]: Without dead ends: 114 [2020-08-18 22:03:08,569 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-18 22:03:08,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-18 22:03:08,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-18 22:03:08,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-18 22:03:08,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-18 22:03:08,573 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-18 22:03:08,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:08,574 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-18 22:03:08,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-18 22:03:08,574 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-18 22:03:08,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-18 22:03:08,575 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:08,575 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:08,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-18 22:03:08,575 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:08,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:08,575 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-18 22:03:08,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:08,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898784027] [2020-08-18 22:03:08,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:08,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:10,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:10,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:10,151 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 22:03:10,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898784027] [2020-08-18 22:03:10,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:10,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-18 22:03:10,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765089772] [2020-08-18 22:03:10,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-18 22:03:10,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:10,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-18 22:03:10,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-18 22:03:10,162 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-18 22:03:10,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:10,545 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-18 22:03:10,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-18 22:03:10,546 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-18 22:03:10,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:10,547 INFO L225 Difference]: With dead ends: 122 [2020-08-18 22:03:10,548 INFO L226 Difference]: Without dead ends: 116 [2020-08-18 22:03:10,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-18 22:03:10,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-18 22:03:10,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-18 22:03:10,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-18 22:03:10,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-18 22:03:10,552 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-18 22:03:10,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:10,553 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-18 22:03:10,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-18 22:03:10,553 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-18 22:03:10,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-18 22:03:10,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:10,554 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:10,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-18 22:03:10,554 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:10,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:10,555 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-18 22:03:10,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:10,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1696475335] [2020-08-18 22:03:10,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:10,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:12,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:12,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:12,202 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 22:03:12,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1696475335] [2020-08-18 22:03:12,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:12,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-18 22:03:12,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628247063] [2020-08-18 22:03:12,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-18 22:03:12,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:12,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-18 22:03:12,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-18 22:03:12,204 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-18 22:03:12,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:12,560 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-18 22:03:12,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-18 22:03:12,561 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-18 22:03:12,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:12,562 INFO L225 Difference]: With dead ends: 124 [2020-08-18 22:03:12,563 INFO L226 Difference]: Without dead ends: 118 [2020-08-18 22:03:12,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-18 22:03:12,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-18 22:03:12,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-18 22:03:12,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-18 22:03:12,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-18 22:03:12,568 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-18 22:03:12,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:12,569 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-18 22:03:12,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-18 22:03:12,569 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-18 22:03:12,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-18 22:03:12,570 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:12,570 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:12,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-18 22:03:12,570 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:12,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:12,571 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-18 22:03:12,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:12,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [323711377] [2020-08-18 22:03:12,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:12,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:14,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:14,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:14,269 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 22:03:14,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [323711377] [2020-08-18 22:03:14,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:14,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-18 22:03:14,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758131314] [2020-08-18 22:03:14,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-18 22:03:14,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:14,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-18 22:03:14,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-18 22:03:14,270 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-18 22:03:14,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:14,618 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-18 22:03:14,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-18 22:03:14,619 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-18 22:03:14,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:14,621 INFO L225 Difference]: With dead ends: 126 [2020-08-18 22:03:14,621 INFO L226 Difference]: Without dead ends: 120 [2020-08-18 22:03:14,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-18 22:03:14,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-18 22:03:14,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-18 22:03:14,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-18 22:03:14,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-18 22:03:14,626 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-18 22:03:14,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:14,626 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-18 22:03:14,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-18 22:03:14,626 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-18 22:03:14,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-18 22:03:14,627 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:14,627 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:14,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-18 22:03:14,627 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:14,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:14,628 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-18 22:03:14,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:14,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1588508833] [2020-08-18 22:03:14,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:14,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:16,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:16,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:16,384 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 22:03:16,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1588508833] [2020-08-18 22:03:16,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:16,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-18 22:03:16,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054112730] [2020-08-18 22:03:16,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-18 22:03:16,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:16,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-18 22:03:16,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-18 22:03:16,387 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-18 22:03:16,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:16,667 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-18 22:03:16,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-18 22:03:16,668 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-18 22:03:16,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:16,670 INFO L225 Difference]: With dead ends: 128 [2020-08-18 22:03:16,670 INFO L226 Difference]: Without dead ends: 122 [2020-08-18 22:03:16,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-18 22:03:16,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-18 22:03:16,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-18 22:03:16,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-18 22:03:16,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-18 22:03:16,675 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-18 22:03:16,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:16,675 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-18 22:03:16,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-18 22:03:16,675 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-18 22:03:16,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-18 22:03:16,676 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:16,676 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:16,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-18 22:03:16,677 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:16,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:16,677 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-18 22:03:16,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:16,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [981548851] [2020-08-18 22:03:16,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:16,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:18,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:18,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:18,511 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 22:03:18,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [981548851] [2020-08-18 22:03:18,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:18,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-18 22:03:18,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928516272] [2020-08-18 22:03:18,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-18 22:03:18,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:18,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-18 22:03:18,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-18 22:03:18,513 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-18 22:03:18,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:18,873 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-18 22:03:18,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-18 22:03:18,874 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-18 22:03:18,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:18,876 INFO L225 Difference]: With dead ends: 130 [2020-08-18 22:03:18,876 INFO L226 Difference]: Without dead ends: 124 [2020-08-18 22:03:18,877 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 22:03:18,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-18 22:03:18,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-18 22:03:18,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-18 22:03:18,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-18 22:03:18,880 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-18 22:03:18,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:18,881 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-18 22:03:18,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-18 22:03:18,881 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-18 22:03:18,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-18 22:03:18,881 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:18,882 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:18,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-18 22:03:18,882 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:18,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:18,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-18 22:03:18,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:18,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2048320819] [2020-08-18 22:03:18,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:18,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:20,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:20,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:20,742 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 22:03:20,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2048320819] [2020-08-18 22:03:20,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:20,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-18 22:03:20,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542472891] [2020-08-18 22:03:20,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-18 22:03:20,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:20,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-18 22:03:20,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-18 22:03:20,744 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-18 22:03:20,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:20,978 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-18 22:03:20,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-18 22:03:20,978 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-18 22:03:20,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:20,980 INFO L225 Difference]: With dead ends: 132 [2020-08-18 22:03:20,980 INFO L226 Difference]: Without dead ends: 126 [2020-08-18 22:03:20,980 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 22:03:20,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-18 22:03:20,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-18 22:03:20,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-18 22:03:20,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-18 22:03:20,985 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-18 22:03:20,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:20,985 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-18 22:03:20,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-18 22:03:20,986 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-18 22:03:20,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-18 22:03:20,986 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:20,986 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:20,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-18 22:03:20,987 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:20,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:20,987 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-18 22:03:20,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:20,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847973073] [2020-08-18 22:03:20,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:21,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:22,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:22,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:22,957 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 22:03:22,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1847973073] [2020-08-18 22:03:22,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:22,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-18 22:03:22,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540612480] [2020-08-18 22:03:22,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-18 22:03:22,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:22,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-18 22:03:22,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-18 22:03:22,959 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-18 22:03:23,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:23,361 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-18 22:03:23,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-18 22:03:23,361 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-18 22:03:23,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:23,363 INFO L225 Difference]: With dead ends: 134 [2020-08-18 22:03:23,363 INFO L226 Difference]: Without dead ends: 128 [2020-08-18 22:03:23,364 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 22:03:23,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-18 22:03:23,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-18 22:03:23,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-18 22:03:23,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-18 22:03:23,368 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-18 22:03:23,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:23,369 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-18 22:03:23,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-18 22:03:23,369 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-18 22:03:23,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-18 22:03:23,370 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:23,370 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:23,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-18 22:03:23,370 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:23,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:23,371 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-18 22:03:23,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:23,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [50554405] [2020-08-18 22:03:23,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:23,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:25,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:25,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:25,391 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 22:03:25,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [50554405] [2020-08-18 22:03:25,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:25,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-18 22:03:25,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639182878] [2020-08-18 22:03:25,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-18 22:03:25,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:25,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-18 22:03:25,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-18 22:03:25,392 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-18 22:03:25,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:25,658 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-18 22:03:25,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-18 22:03:25,659 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-18 22:03:25,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:25,660 INFO L225 Difference]: With dead ends: 136 [2020-08-18 22:03:25,660 INFO L226 Difference]: Without dead ends: 130 [2020-08-18 22:03:25,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-18 22:03:25,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-18 22:03:25,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-18 22:03:25,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-18 22:03:25,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-18 22:03:25,664 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-18 22:03:25,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:25,664 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-18 22:03:25,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-18 22:03:25,665 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-18 22:03:25,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-18 22:03:25,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:25,665 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:25,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-18 22:03:25,665 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:25,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:25,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-18 22:03:25,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:25,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983652457] [2020-08-18 22:03:25,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:25,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:27,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:27,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:27,817 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 0 proven. 3364 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:27,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983652457] [2020-08-18 22:03:27,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:27,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-08-18 22:03:27,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284338724] [2020-08-18 22:03:27,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-08-18 22:03:27,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:27,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-08-18 22:03:27,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-18 22:03:27,818 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 62 states. [2020-08-18 22:03:28,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:28,206 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2020-08-18 22:03:28,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-08-18 22:03:28,207 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 128 [2020-08-18 22:03:28,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:28,208 INFO L225 Difference]: With dead ends: 138 [2020-08-18 22:03:28,208 INFO L226 Difference]: Without dead ends: 132 [2020-08-18 22:03:28,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-18 22:03:28,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-08-18 22:03:28,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2020-08-18 22:03:28,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-08-18 22:03:28,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 131 transitions. [2020-08-18 22:03:28,211 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 131 transitions. Word has length 128 [2020-08-18 22:03:28,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:28,212 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 131 transitions. [2020-08-18 22:03:28,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-08-18 22:03:28,212 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 131 transitions. [2020-08-18 22:03:28,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-08-18 22:03:28,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:28,212 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:28,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-08-18 22:03:28,213 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:28,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:28,213 INFO L82 PathProgramCache]: Analyzing trace with hash 2089102067, now seen corresponding path program 59 times [2020-08-18 22:03:28,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:28,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321293482] [2020-08-18 22:03:28,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:28,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat