/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=DEEPEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/data_structures_set_multi_proc_trivial_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 21:13:07,690 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 21:13:07,693 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 21:13:07,717 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 21:13:07,718 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 21:13:07,719 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 21:13:07,720 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 21:13:07,722 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 21:13:07,723 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 21:13:07,724 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 21:13:07,725 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 21:13:07,726 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 21:13:07,727 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 21:13:07,728 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 21:13:07,729 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 21:13:07,730 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 21:13:07,731 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 21:13:07,732 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 21:13:07,733 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 21:13:07,735 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 21:13:07,737 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 21:13:07,738 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 21:13:07,739 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 21:13:07,740 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 21:13:07,746 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 21:13:07,746 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 21:13:07,746 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 21:13:07,747 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 21:13:07,747 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 21:13:07,748 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-18 21:13:07,752 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 21:13:07,753 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 21:13:07,754 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 21:13:07,755 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 21:13:07,778 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 21:13:07,778 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 21:13:07,779 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 21:13:07,779 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 21:13:07,780 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 21:13:07,780 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 21:13:07,780 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 21:13:07,780 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 21:13:07,780 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 21:13:07,781 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 21:13:07,781 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 21:13:07,781 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 21:13:07,781 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 21:13:07,781 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 21:13:07,782 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 21:13:07,782 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 21:13:07,782 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 21:13:07,782 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 21:13:07,782 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 21:13:07,783 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 21:13:07,783 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 21:13:07,783 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:13:07,783 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 21:13:07,783 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 21:13:07,784 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 21:13:07,784 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 21:13:07,784 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 21:13:07,784 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 21:13:07,784 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 21:13:07,784 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=DEEPEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST; [2020-08-18 21:13:08,078 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 21:13:08,090 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 21:13:08,094 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 21:13:08,095 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 21:13:08,096 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 21:13:08,096 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/data_structures_set_multi_proc_trivial_ground.i [2020-08-18 21:13:08,156 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b3e629677/5dc79879ad2b4ec2b0db37f24db58ee5/FLAGef2b85034 [2020-08-18 21:13:08,622 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 21:13:08,623 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-examples/data_structures_set_multi_proc_trivial_ground.i [2020-08-18 21:13:08,630 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b3e629677/5dc79879ad2b4ec2b0db37f24db58ee5/FLAGef2b85034 [2020-08-18 21:13:09,015 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b3e629677/5dc79879ad2b4ec2b0db37f24db58ee5 [2020-08-18 21:13:09,024 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 21:13:09,026 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 21:13:09,027 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 21:13:09,027 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 21:13:09,030 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 21:13:09,031 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:13:09" (1/1) ... [2020-08-18 21:13:09,034 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@387f035d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:09, skipping insertion in model container [2020-08-18 21:13:09,034 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:13:09" (1/1) ... [2020-08-18 21:13:09,041 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 21:13:09,064 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 21:13:09,318 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:13:09,329 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 21:13:09,358 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:13:09,456 INFO L208 MainTranslator]: Completed translation [2020-08-18 21:13:09,458 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:09 WrapperNode [2020-08-18 21:13:09,458 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 21:13:09,459 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 21:13:09,459 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 21:13:09,459 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 21:13:09,469 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:09" (1/1) ... [2020-08-18 21:13:09,470 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:09" (1/1) ... [2020-08-18 21:13:09,479 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:09" (1/1) ... [2020-08-18 21:13:09,479 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:09" (1/1) ... [2020-08-18 21:13:09,489 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:09" (1/1) ... [2020-08-18 21:13:09,497 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:09" (1/1) ... [2020-08-18 21:13:09,499 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:09" (1/1) ... [2020-08-18 21:13:09,502 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 21:13:09,503 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 21:13:09,503 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 21:13:09,503 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 21:13:09,504 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:09" (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 21:13:09,564 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 21:13:09,564 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 21:13:09,564 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 21:13:09,564 INFO L138 BoogieDeclarations]: Found implementation of procedure insert [2020-08-18 21:13:09,565 INFO L138 BoogieDeclarations]: Found implementation of procedure elem_exists [2020-08-18 21:13:09,565 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 21:13:09,565 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 21:13:09,566 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 21:13:09,566 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 21:13:09,566 INFO L130 BoogieDeclarations]: Found specification of procedure insert [2020-08-18 21:13:09,567 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 21:13:09,567 INFO L130 BoogieDeclarations]: Found specification of procedure elem_exists [2020-08-18 21:13:09,567 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 21:13:09,567 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 21:13:09,567 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 21:13:09,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 21:13:09,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 21:13:09,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 21:13:09,940 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 21:13:09,940 INFO L295 CfgBuilder]: Removed 10 assume(true) statements. [2020-08-18 21:13:09,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:13:09 BoogieIcfgContainer [2020-08-18 21:13:09,945 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 21:13:09,946 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 21:13:09,946 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 21:13:09,949 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 21:13:09,949 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:13:09" (1/3) ... [2020-08-18 21:13:09,950 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23ea2656 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:13:09, skipping insertion in model container [2020-08-18 21:13:09,950 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:09" (2/3) ... [2020-08-18 21:13:09,951 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23ea2656 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:13:09, skipping insertion in model container [2020-08-18 21:13:09,951 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:13:09" (3/3) ... [2020-08-18 21:13:09,953 INFO L109 eAbstractionObserver]: Analyzing ICFG data_structures_set_multi_proc_trivial_ground.i [2020-08-18 21:13:09,964 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 21:13:09,971 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 21:13:09,987 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 21:13:10,013 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 21:13:10,013 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 21:13:10,013 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 21:13:10,013 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 21:13:10,013 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 21:13:10,013 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 21:13:10,014 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 21:13:10,014 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 21:13:10,035 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states. [2020-08-18 21:13:10,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 21:13:10,040 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:10,041 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:10,042 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:10,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:10,047 INFO L82 PathProgramCache]: Analyzing trace with hash 528217166, now seen corresponding path program 1 times [2020-08-18 21:13:10,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:10,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [791736642] [2020-08-18 21:13:10,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:10,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:10,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:10,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:10,279 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 21:13:10,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [791736642] [2020-08-18 21:13:10,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:13:10,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 21:13:10,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174267821] [2020-08-18 21:13:10,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 21:13:10,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:10,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 21:13:10,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:13:10,302 INFO L87 Difference]: Start difference. First operand 61 states. Second operand 4 states. [2020-08-18 21:13:10,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:10,614 INFO L93 Difference]: Finished difference Result 150 states and 228 transitions. [2020-08-18 21:13:10,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 21:13:10,616 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2020-08-18 21:13:10,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:10,627 INFO L225 Difference]: With dead ends: 150 [2020-08-18 21:13:10,628 INFO L226 Difference]: Without dead ends: 89 [2020-08-18 21:13:10,632 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 21:13:10,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-18 21:13:10,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 57. [2020-08-18 21:13:10,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 21:13:10,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 70 transitions. [2020-08-18 21:13:10,689 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 70 transitions. Word has length 14 [2020-08-18 21:13:10,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:10,690 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 70 transitions. [2020-08-18 21:13:10,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 21:13:10,690 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 70 transitions. [2020-08-18 21:13:10,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 21:13:10,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:10,692 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:10,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 21:13:10,692 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:10,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:10,693 INFO L82 PathProgramCache]: Analyzing trace with hash 396779504, now seen corresponding path program 1 times [2020-08-18 21:13:10,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:10,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1384805875] [2020-08-18 21:13:10,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:10,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:10,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:10,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:10,794 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 21:13:10,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1384805875] [2020-08-18 21:13:10,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:10,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 21:13:10,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504897424] [2020-08-18 21:13:10,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:13:10,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:10,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:13:10,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:13:10,802 INFO L87 Difference]: Start difference. First operand 57 states and 70 transitions. Second operand 5 states. [2020-08-18 21:13:11,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:11,119 INFO L93 Difference]: Finished difference Result 170 states and 222 transitions. [2020-08-18 21:13:11,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:13:11,119 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-08-18 21:13:11,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:11,122 INFO L225 Difference]: With dead ends: 170 [2020-08-18 21:13:11,122 INFO L226 Difference]: Without dead ends: 122 [2020-08-18 21:13:11,124 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 21:13:11,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-18 21:13:11,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 59. [2020-08-18 21:13:11,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 21:13:11,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 72 transitions. [2020-08-18 21:13:11,137 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 72 transitions. Word has length 16 [2020-08-18 21:13:11,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:11,137 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 72 transitions. [2020-08-18 21:13:11,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:13:11,138 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 72 transitions. [2020-08-18 21:13:11,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 21:13:11,138 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:11,139 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:11,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 21:13:11,139 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:11,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:11,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1360762094, now seen corresponding path program 2 times [2020-08-18 21:13:11,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:11,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481085545] [2020-08-18 21:13:11,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:11,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:11,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:11,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:11,211 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 21:13:11,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481085545] [2020-08-18 21:13:11,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:11,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 21:13:11,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814430881] [2020-08-18 21:13:11,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:13:11,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:11,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:13:11,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:13:11,222 INFO L87 Difference]: Start difference. First operand 59 states and 72 transitions. Second operand 6 states. [2020-08-18 21:13:11,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:11,547 INFO L93 Difference]: Finished difference Result 203 states and 268 transitions. [2020-08-18 21:13:11,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 21:13:11,548 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2020-08-18 21:13:11,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:11,551 INFO L225 Difference]: With dead ends: 203 [2020-08-18 21:13:11,552 INFO L226 Difference]: Without dead ends: 155 [2020-08-18 21:13:11,555 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 21:13:11,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-08-18 21:13:11,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 61. [2020-08-18 21:13:11,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 21:13:11,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 74 transitions. [2020-08-18 21:13:11,585 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 74 transitions. Word has length 18 [2020-08-18 21:13:11,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:11,585 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 74 transitions. [2020-08-18 21:13:11,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:13:11,588 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 74 transitions. [2020-08-18 21:13:11,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 21:13:11,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:11,589 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:11,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 21:13:11,590 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:11,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:11,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1858876852, now seen corresponding path program 3 times [2020-08-18 21:13:11,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:11,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836063679] [2020-08-18 21:13:11,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:11,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:11,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:11,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:11,729 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 21:13:11,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1836063679] [2020-08-18 21:13:11,730 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:11,730 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:13:11,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381302147] [2020-08-18 21:13:11,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:13:11,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:11,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:13:11,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:13:11,734 INFO L87 Difference]: Start difference. First operand 61 states and 74 transitions. Second operand 7 states. [2020-08-18 21:13:12,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:12,152 INFO L93 Difference]: Finished difference Result 236 states and 314 transitions. [2020-08-18 21:13:12,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:13:12,155 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2020-08-18 21:13:12,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:12,157 INFO L225 Difference]: With dead ends: 236 [2020-08-18 21:13:12,158 INFO L226 Difference]: Without dead ends: 188 [2020-08-18 21:13:12,160 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 21:13:12,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2020-08-18 21:13:12,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 63. [2020-08-18 21:13:12,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 21:13:12,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2020-08-18 21:13:12,172 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 20 [2020-08-18 21:13:12,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:12,172 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2020-08-18 21:13:12,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:13:12,172 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2020-08-18 21:13:12,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 21:13:12,173 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:12,173 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:12,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 21:13:12,174 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:12,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:12,174 INFO L82 PathProgramCache]: Analyzing trace with hash -739516458, now seen corresponding path program 4 times [2020-08-18 21:13:12,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:12,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415328161] [2020-08-18 21:13:12,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:12,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:12,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,237 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-08-18 21:13:12,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415328161] [2020-08-18 21:13:12,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:13:12,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 21:13:12,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142136033] [2020-08-18 21:13:12,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:13:12,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:12,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:13:12,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:13:12,240 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand 5 states. [2020-08-18 21:13:12,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:12,367 INFO L93 Difference]: Finished difference Result 116 states and 144 transitions. [2020-08-18 21:13:12,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:13:12,367 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2020-08-18 21:13:12,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:12,368 INFO L225 Difference]: With dead ends: 116 [2020-08-18 21:13:12,369 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 21:13:12,370 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 21:13:12,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 21:13:12,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2020-08-18 21:13:12,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 21:13:12,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 77 transitions. [2020-08-18 21:13:12,378 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 77 transitions. Word has length 22 [2020-08-18 21:13:12,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:12,378 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 77 transitions. [2020-08-18 21:13:12,378 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:13:12,378 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 77 transitions. [2020-08-18 21:13:12,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 21:13:12,380 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:12,380 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:12,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 21:13:12,381 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:12,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:12,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1301458888, now seen corresponding path program 1 times [2020-08-18 21:13:12,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:12,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [868018970] [2020-08-18 21:13:12,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:12,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:12,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-18 21:13:12,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-18 21:13:12,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,478 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 21:13:12,478 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [868018970] [2020-08-18 21:13:12,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:12,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 21:13:12,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264103089] [2020-08-18 21:13:12,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 21:13:12,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:12,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 21:13:12,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:13:12,481 INFO L87 Difference]: Start difference. First operand 65 states and 77 transitions. Second operand 9 states. [2020-08-18 21:13:12,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:12,835 INFO L93 Difference]: Finished difference Result 223 states and 292 transitions. [2020-08-18 21:13:12,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 21:13:12,837 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 41 [2020-08-18 21:13:12,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:12,840 INFO L225 Difference]: With dead ends: 223 [2020-08-18 21:13:12,841 INFO L226 Difference]: Without dead ends: 173 [2020-08-18 21:13:12,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:13:12,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2020-08-18 21:13:12,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 67. [2020-08-18 21:13:12,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 21:13:12,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2020-08-18 21:13:12,852 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 41 [2020-08-18 21:13:12,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:12,853 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2020-08-18 21:13:12,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 21:13:12,853 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2020-08-18 21:13:12,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 21:13:12,854 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:12,855 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:12,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 21:13:12,855 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:12,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:12,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1302417578, now seen corresponding path program 2 times [2020-08-18 21:13:12,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:12,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395683162] [2020-08-18 21:13:12,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:12,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:12,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 21:13:12,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-18 21:13:12,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,992 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 21:13:12,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395683162] [2020-08-18 21:13:12,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:12,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 21:13:12,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199131214] [2020-08-18 21:13:12,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 21:13:12,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:12,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 21:13:12,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:13:12,995 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand 10 states. [2020-08-18 21:13:13,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:13,468 INFO L93 Difference]: Finished difference Result 246 states and 324 transitions. [2020-08-18 21:13:13,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 21:13:13,469 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2020-08-18 21:13:13,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:13,471 INFO L225 Difference]: With dead ends: 246 [2020-08-18 21:13:13,471 INFO L226 Difference]: Without dead ends: 196 [2020-08-18 21:13:13,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:13:13,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2020-08-18 21:13:13,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 69. [2020-08-18 21:13:13,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 21:13:13,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 81 transitions. [2020-08-18 21:13:13,491 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 81 transitions. Word has length 43 [2020-08-18 21:13:13,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:13,491 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 81 transitions. [2020-08-18 21:13:13,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 21:13:13,492 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 81 transitions. [2020-08-18 21:13:13,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 21:13:13,493 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:13,493 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:13,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 21:13:13,494 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:13,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:13,494 INFO L82 PathProgramCache]: Analyzing trace with hash 2071248628, now seen corresponding path program 3 times [2020-08-18 21:13:13,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:13,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78246861] [2020-08-18 21:13:13,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:13,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:13,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:13,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:13,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-18 21:13:13,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:13,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-18 21:13:13,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:13,590 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 21:13:13,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78246861] [2020-08-18 21:13:13,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:13,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 21:13:13,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116772805] [2020-08-18 21:13:13,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 21:13:13,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:13,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 21:13:13,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:13:13,593 INFO L87 Difference]: Start difference. First operand 69 states and 81 transitions. Second operand 11 states. [2020-08-18 21:13:14,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:14,114 INFO L93 Difference]: Finished difference Result 269 states and 356 transitions. [2020-08-18 21:13:14,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 21:13:14,115 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-08-18 21:13:14,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:14,117 INFO L225 Difference]: With dead ends: 269 [2020-08-18 21:13:14,117 INFO L226 Difference]: Without dead ends: 219 [2020-08-18 21:13:14,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:13:14,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2020-08-18 21:13:14,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 71. [2020-08-18 21:13:14,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 21:13:14,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 83 transitions. [2020-08-18 21:13:14,134 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 83 transitions. Word has length 45 [2020-08-18 21:13:14,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:14,135 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 83 transitions. [2020-08-18 21:13:14,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 21:13:14,135 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 83 transitions. [2020-08-18 21:13:14,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 21:13:14,136 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:14,136 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:14,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 21:13:14,137 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:14,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:14,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1464164114, now seen corresponding path program 4 times [2020-08-18 21:13:14,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:14,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156105682] [2020-08-18 21:13:14,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:14,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:14,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:14,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:14,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-18 21:13:14,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:14,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-18 21:13:14,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:14,294 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 21:13:14,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156105682] [2020-08-18 21:13:14,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:14,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 21:13:14,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197628845] [2020-08-18 21:13:14,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 21:13:14,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:14,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 21:13:14,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:13:14,296 INFO L87 Difference]: Start difference. First operand 71 states and 83 transitions. Second operand 12 states. [2020-08-18 21:13:14,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:14,821 INFO L93 Difference]: Finished difference Result 292 states and 388 transitions. [2020-08-18 21:13:14,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 21:13:14,822 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 47 [2020-08-18 21:13:14,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:14,825 INFO L225 Difference]: With dead ends: 292 [2020-08-18 21:13:14,825 INFO L226 Difference]: Without dead ends: 242 [2020-08-18 21:13:14,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2020-08-18 21:13:14,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2020-08-18 21:13:14,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 73. [2020-08-18 21:13:14,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 21:13:14,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 85 transitions. [2020-08-18 21:13:14,850 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 85 transitions. Word has length 47 [2020-08-18 21:13:14,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:14,850 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 85 transitions. [2020-08-18 21:13:14,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 21:13:14,850 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 85 transitions. [2020-08-18 21:13:14,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 21:13:14,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:14,852 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:14,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 21:13:14,852 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:14,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:14,852 INFO L82 PathProgramCache]: Analyzing trace with hash -2123468880, now seen corresponding path program 5 times [2020-08-18 21:13:14,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:14,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1255611405] [2020-08-18 21:13:14,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:14,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:15,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-18 21:13:15,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-18 21:13:15,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,058 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 21:13:15,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1255611405] [2020-08-18 21:13:15,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:15,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 21:13:15,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223973137] [2020-08-18 21:13:15,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 21:13:15,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:15,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 21:13:15,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:13:15,062 INFO L87 Difference]: Start difference. First operand 73 states and 85 transitions. Second operand 13 states. [2020-08-18 21:13:15,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:15,699 INFO L93 Difference]: Finished difference Result 315 states and 420 transitions. [2020-08-18 21:13:15,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 21:13:15,699 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 49 [2020-08-18 21:13:15,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:15,702 INFO L225 Difference]: With dead ends: 315 [2020-08-18 21:13:15,702 INFO L226 Difference]: Without dead ends: 265 [2020-08-18 21:13:15,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:13:15,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-08-18 21:13:15,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 75. [2020-08-18 21:13:15,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 21:13:15,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 87 transitions. [2020-08-18 21:13:15,721 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 87 transitions. Word has length 49 [2020-08-18 21:13:15,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:15,721 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 87 transitions. [2020-08-18 21:13:15,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 21:13:15,721 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 87 transitions. [2020-08-18 21:13:15,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 21:13:15,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:15,723 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:15,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 21:13:15,723 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:15,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:15,723 INFO L82 PathProgramCache]: Analyzing trace with hash -980037426, now seen corresponding path program 6 times [2020-08-18 21:13:15,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:15,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470386683] [2020-08-18 21:13:15,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:15,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:15,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-18 21:13:15,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-18 21:13:15,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,903 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 21:13:15,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470386683] [2020-08-18 21:13:15,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:15,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 21:13:15,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650587630] [2020-08-18 21:13:15,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 21:13:15,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:15,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 21:13:15,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-08-18 21:13:15,905 INFO L87 Difference]: Start difference. First operand 75 states and 87 transitions. Second operand 14 states. [2020-08-18 21:13:16,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:16,521 INFO L93 Difference]: Finished difference Result 338 states and 452 transitions. [2020-08-18 21:13:16,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 21:13:16,522 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 51 [2020-08-18 21:13:16,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:16,525 INFO L225 Difference]: With dead ends: 338 [2020-08-18 21:13:16,525 INFO L226 Difference]: Without dead ends: 288 [2020-08-18 21:13:16,527 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2020-08-18 21:13:16,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2020-08-18 21:13:16,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 77. [2020-08-18 21:13:16,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 21:13:16,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 89 transitions. [2020-08-18 21:13:16,537 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 89 transitions. Word has length 51 [2020-08-18 21:13:16,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:16,538 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 89 transitions. [2020-08-18 21:13:16,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 21:13:16,538 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 89 transitions. [2020-08-18 21:13:16,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 21:13:16,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:16,545 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:16,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 21:13:16,545 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:16,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:16,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1654037908, now seen corresponding path program 7 times [2020-08-18 21:13:16,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:16,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204198808] [2020-08-18 21:13:16,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:16,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:16,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-18 21:13:16,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-18 21:13:16,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,693 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 21:13:16,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1204198808] [2020-08-18 21:13:16,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:16,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 21:13:16,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155862770] [2020-08-18 21:13:16,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 21:13:16,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:16,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 21:13:16,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:13:16,695 INFO L87 Difference]: Start difference. First operand 77 states and 89 transitions. Second operand 15 states. [2020-08-18 21:13:17,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:17,407 INFO L93 Difference]: Finished difference Result 361 states and 484 transitions. [2020-08-18 21:13:17,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 21:13:17,408 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 53 [2020-08-18 21:13:17,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:17,410 INFO L225 Difference]: With dead ends: 361 [2020-08-18 21:13:17,410 INFO L226 Difference]: Without dead ends: 311 [2020-08-18 21:13:17,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=100, Invalid=172, Unknown=0, NotChecked=0, Total=272 [2020-08-18 21:13:17,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2020-08-18 21:13:17,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 79. [2020-08-18 21:13:17,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 21:13:17,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 91 transitions. [2020-08-18 21:13:17,420 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 91 transitions. Word has length 53 [2020-08-18 21:13:17,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:17,420 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 91 transitions. [2020-08-18 21:13:17,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 21:13:17,421 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 91 transitions. [2020-08-18 21:13:17,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 21:13:17,421 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:17,422 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:17,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 21:13:17,422 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:17,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:17,422 INFO L82 PathProgramCache]: Analyzing trace with hash -828439414, now seen corresponding path program 8 times [2020-08-18 21:13:17,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:17,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1905106983] [2020-08-18 21:13:17,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:17,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:17,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:17,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:17,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-18 21:13:17,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:17,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-18 21:13:17,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:17,638 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 21:13:17,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1905106983] [2020-08-18 21:13:17,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:17,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 21:13:17,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376557815] [2020-08-18 21:13:17,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 21:13:17,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:17,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 21:13:17,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-08-18 21:13:17,642 INFO L87 Difference]: Start difference. First operand 79 states and 91 transitions. Second operand 16 states. [2020-08-18 21:13:18,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:18,448 INFO L93 Difference]: Finished difference Result 384 states and 516 transitions. [2020-08-18 21:13:18,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 21:13:18,449 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 55 [2020-08-18 21:13:18,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:18,452 INFO L225 Difference]: With dead ends: 384 [2020-08-18 21:13:18,452 INFO L226 Difference]: Without dead ends: 334 [2020-08-18 21:13:18,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=114, Invalid=192, Unknown=0, NotChecked=0, Total=306 [2020-08-18 21:13:18,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2020-08-18 21:13:18,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 81. [2020-08-18 21:13:18,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 21:13:18,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 93 transitions. [2020-08-18 21:13:18,462 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 93 transitions. Word has length 55 [2020-08-18 21:13:18,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:18,462 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 93 transitions. [2020-08-18 21:13:18,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 21:13:18,463 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 93 transitions. [2020-08-18 21:13:18,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 21:13:18,464 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:18,464 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:18,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 21:13:18,465 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:18,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:18,465 INFO L82 PathProgramCache]: Analyzing trace with hash -1997236440, now seen corresponding path program 9 times [2020-08-18 21:13:18,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:18,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [433742941] [2020-08-18 21:13:18,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:18,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:18,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:18,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:18,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-18 21:13:18,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:18,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-18 21:13:18,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:18,733 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 21:13:18,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [433742941] [2020-08-18 21:13:18,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:18,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 21:13:18,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442433627] [2020-08-18 21:13:18,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 21:13:18,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:18,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 21:13:18,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2020-08-18 21:13:18,736 INFO L87 Difference]: Start difference. First operand 81 states and 93 transitions. Second operand 17 states. [2020-08-18 21:13:19,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:19,493 INFO L93 Difference]: Finished difference Result 407 states and 548 transitions. [2020-08-18 21:13:19,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 21:13:19,494 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 57 [2020-08-18 21:13:19,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:19,497 INFO L225 Difference]: With dead ends: 407 [2020-08-18 21:13:19,498 INFO L226 Difference]: Without dead ends: 357 [2020-08-18 21:13:19,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=129, Invalid=213, Unknown=0, NotChecked=0, Total=342 [2020-08-18 21:13:19,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2020-08-18 21:13:19,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 83. [2020-08-18 21:13:19,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 21:13:19,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 95 transitions. [2020-08-18 21:13:19,509 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 95 transitions. Word has length 57 [2020-08-18 21:13:19,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:19,510 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 95 transitions. [2020-08-18 21:13:19,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 21:13:19,510 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 95 transitions. [2020-08-18 21:13:19,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-18 21:13:19,510 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:19,511 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:19,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 21:13:19,511 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:19,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:19,511 INFO L82 PathProgramCache]: Analyzing trace with hash 70253126, now seen corresponding path program 10 times [2020-08-18 21:13:19,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:19,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346935603] [2020-08-18 21:13:19,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:19,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:19,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:19,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:19,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-08-18 21:13:19,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:19,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-18 21:13:19,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:19,732 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 21:13:19,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346935603] [2020-08-18 21:13:19,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:19,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 21:13:19,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912073998] [2020-08-18 21:13:19,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 21:13:19,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:19,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 21:13:19,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-08-18 21:13:19,735 INFO L87 Difference]: Start difference. First operand 83 states and 95 transitions. Second operand 18 states. [2020-08-18 21:13:20,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:20,732 INFO L93 Difference]: Finished difference Result 430 states and 580 transitions. [2020-08-18 21:13:20,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 21:13:20,733 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 59 [2020-08-18 21:13:20,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:20,737 INFO L225 Difference]: With dead ends: 430 [2020-08-18 21:13:20,737 INFO L226 Difference]: Without dead ends: 380 [2020-08-18 21:13:20,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=145, Invalid=235, Unknown=0, NotChecked=0, Total=380 [2020-08-18 21:13:20,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2020-08-18 21:13:20,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 85. [2020-08-18 21:13:20,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 21:13:20,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 97 transitions. [2020-08-18 21:13:20,753 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 97 transitions. Word has length 59 [2020-08-18 21:13:20,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:20,754 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 97 transitions. [2020-08-18 21:13:20,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 21:13:20,754 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 97 transitions. [2020-08-18 21:13:20,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 21:13:20,755 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:20,755 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:20,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 21:13:20,756 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:20,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:20,756 INFO L82 PathProgramCache]: Analyzing trace with hash -1642131996, now seen corresponding path program 11 times [2020-08-18 21:13:20,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:20,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045413547] [2020-08-18 21:13:20,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:20,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:20,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:20,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:20,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-18 21:13:20,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:20,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-18 21:13:20,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:20,998 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 21:13:20,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045413547] [2020-08-18 21:13:21,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:21,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 21:13:21,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488657653] [2020-08-18 21:13:21,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 21:13:21,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:21,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 21:13:21,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342 [2020-08-18 21:13:21,003 INFO L87 Difference]: Start difference. First operand 85 states and 97 transitions. Second operand 19 states. [2020-08-18 21:13:21,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:21,944 INFO L93 Difference]: Finished difference Result 453 states and 612 transitions. [2020-08-18 21:13:21,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 21:13:21,945 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 61 [2020-08-18 21:13:21,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:21,948 INFO L225 Difference]: With dead ends: 453 [2020-08-18 21:13:21,948 INFO L226 Difference]: Without dead ends: 403 [2020-08-18 21:13:21,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=162, Invalid=258, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:13:21,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2020-08-18 21:13:21,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 87. [2020-08-18 21:13:21,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 21:13:21,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 99 transitions. [2020-08-18 21:13:21,961 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 99 transitions. Word has length 61 [2020-08-18 21:13:21,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:21,963 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 99 transitions. [2020-08-18 21:13:21,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 21:13:21,964 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 99 transitions. [2020-08-18 21:13:21,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 21:13:21,973 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:21,973 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:21,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 21:13:21,974 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:21,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:21,974 INFO L82 PathProgramCache]: Analyzing trace with hash 2023207426, now seen corresponding path program 12 times [2020-08-18 21:13:21,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:21,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126962754] [2020-08-18 21:13:21,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:21,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:22,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:22,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:22,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-18 21:13:22,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:22,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-08-18 21:13:22,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:22,233 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 21:13:22,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126962754] [2020-08-18 21:13:22,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:22,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 21:13:22,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895753270] [2020-08-18 21:13:22,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 21:13:22,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:22,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 21:13:22,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-08-18 21:13:22,238 INFO L87 Difference]: Start difference. First operand 87 states and 99 transitions. Second operand 20 states. [2020-08-18 21:13:23,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:23,142 INFO L93 Difference]: Finished difference Result 476 states and 644 transitions. [2020-08-18 21:13:23,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 21:13:23,142 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 63 [2020-08-18 21:13:23,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:23,145 INFO L225 Difference]: With dead ends: 476 [2020-08-18 21:13:23,145 INFO L226 Difference]: Without dead ends: 426 [2020-08-18 21:13:23,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=180, Invalid=282, Unknown=0, NotChecked=0, Total=462 [2020-08-18 21:13:23,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2020-08-18 21:13:23,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 89. [2020-08-18 21:13:23,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 21:13:23,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2020-08-18 21:13:23,159 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 63 [2020-08-18 21:13:23,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:23,159 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2020-08-18 21:13:23,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 21:13:23,160 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2020-08-18 21:13:23,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-18 21:13:23,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:23,161 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:23,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 21:13:23,161 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:23,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:23,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1753758048, now seen corresponding path program 13 times [2020-08-18 21:13:23,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:23,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1252758793] [2020-08-18 21:13:23,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:23,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:23,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:23,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:23,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-18 21:13:23,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:23,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2020-08-18 21:13:23,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:23,404 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 21:13:23,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1252758793] [2020-08-18 21:13:23,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:23,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 21:13:23,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042745449] [2020-08-18 21:13:23,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 21:13:23,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:23,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 21:13:23,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:13:23,411 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand 21 states. [2020-08-18 21:13:24,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:24,605 INFO L93 Difference]: Finished difference Result 499 states and 676 transitions. [2020-08-18 21:13:24,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 21:13:24,606 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2020-08-18 21:13:24,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:24,613 INFO L225 Difference]: With dead ends: 499 [2020-08-18 21:13:24,613 INFO L226 Difference]: Without dead ends: 449 [2020-08-18 21:13:24,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=199, Invalid=307, Unknown=0, NotChecked=0, Total=506 [2020-08-18 21:13:24,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2020-08-18 21:13:24,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 91. [2020-08-18 21:13:24,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 21:13:24,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 103 transitions. [2020-08-18 21:13:24,625 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 103 transitions. Word has length 65 [2020-08-18 21:13:24,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:24,625 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 103 transitions. [2020-08-18 21:13:24,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 21:13:24,626 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 103 transitions. [2020-08-18 21:13:24,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 21:13:24,626 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:24,627 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:24,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 21:13:24,627 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:24,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:24,627 INFO L82 PathProgramCache]: Analyzing trace with hash 2124753854, now seen corresponding path program 14 times [2020-08-18 21:13:24,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:24,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [543225624] [2020-08-18 21:13:24,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:24,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:24,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:24,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:24,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-08-18 21:13:24,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:24,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2020-08-18 21:13:24,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:24,935 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 21:13:24,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [543225624] [2020-08-18 21:13:24,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:24,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 21:13:24,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635416730] [2020-08-18 21:13:24,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 21:13:24,937 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:24,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 21:13:24,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-08-18 21:13:24,937 INFO L87 Difference]: Start difference. First operand 91 states and 103 transitions. Second operand 22 states. [2020-08-18 21:13:26,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:26,167 INFO L93 Difference]: Finished difference Result 522 states and 708 transitions. [2020-08-18 21:13:26,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 21:13:26,168 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 67 [2020-08-18 21:13:26,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:26,172 INFO L225 Difference]: With dead ends: 522 [2020-08-18 21:13:26,173 INFO L226 Difference]: Without dead ends: 472 [2020-08-18 21:13:26,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=219, Invalid=333, Unknown=0, NotChecked=0, Total=552 [2020-08-18 21:13:26,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-08-18 21:13:26,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 93. [2020-08-18 21:13:26,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 21:13:26,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 105 transitions. [2020-08-18 21:13:26,185 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 105 transitions. Word has length 67 [2020-08-18 21:13:26,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:26,185 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 105 transitions. [2020-08-18 21:13:26,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 21:13:26,186 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 105 transitions. [2020-08-18 21:13:26,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 21:13:26,187 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:26,187 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:26,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 21:13:26,188 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:26,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:26,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1343078748, now seen corresponding path program 15 times [2020-08-18 21:13:26,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:26,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70508441] [2020-08-18 21:13:26,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:26,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:26,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:26,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:26,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-08-18 21:13:26,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:26,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2020-08-18 21:13:26,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:26,477 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 21:13:26,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70508441] [2020-08-18 21:13:26,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:26,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 21:13:26,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775412839] [2020-08-18 21:13:26,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 21:13:26,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:26,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 21:13:26,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=292, Unknown=0, NotChecked=0, Total=506 [2020-08-18 21:13:26,481 INFO L87 Difference]: Start difference. First operand 93 states and 105 transitions. Second operand 23 states. [2020-08-18 21:13:27,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:27,843 INFO L93 Difference]: Finished difference Result 545 states and 740 transitions. [2020-08-18 21:13:27,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 21:13:27,844 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 69 [2020-08-18 21:13:27,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:27,850 INFO L225 Difference]: With dead ends: 545 [2020-08-18 21:13:27,850 INFO L226 Difference]: Without dead ends: 495 [2020-08-18 21:13:27,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=240, Invalid=360, Unknown=0, NotChecked=0, Total=600 [2020-08-18 21:13:27,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2020-08-18 21:13:27,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 95. [2020-08-18 21:13:27,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 21:13:27,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 107 transitions. [2020-08-18 21:13:27,868 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 107 transitions. Word has length 69 [2020-08-18 21:13:27,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:27,868 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 107 transitions. [2020-08-18 21:13:27,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 21:13:27,868 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 107 transitions. [2020-08-18 21:13:27,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-18 21:13:27,869 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:27,869 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:27,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 21:13:27,870 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:27,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:27,870 INFO L82 PathProgramCache]: Analyzing trace with hash 1772578682, now seen corresponding path program 16 times [2020-08-18 21:13:27,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:27,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602169972] [2020-08-18 21:13:27,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:27,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:28,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:28,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:28,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-08-18 21:13:28,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:28,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2020-08-18 21:13:28,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:28,215 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 21:13:28,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602169972] [2020-08-18 21:13:28,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:28,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 21:13:28,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890421752] [2020-08-18 21:13:28,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 21:13:28,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:28,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 21:13:28,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-08-18 21:13:28,218 INFO L87 Difference]: Start difference. First operand 95 states and 107 transitions. Second operand 24 states. [2020-08-18 21:13:29,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:29,412 INFO L93 Difference]: Finished difference Result 568 states and 772 transitions. [2020-08-18 21:13:29,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 21:13:29,412 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 71 [2020-08-18 21:13:29,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:29,416 INFO L225 Difference]: With dead ends: 568 [2020-08-18 21:13:29,416 INFO L226 Difference]: Without dead ends: 518 [2020-08-18 21:13:29,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=262, Invalid=388, Unknown=0, NotChecked=0, Total=650 [2020-08-18 21:13:29,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2020-08-18 21:13:29,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 97. [2020-08-18 21:13:29,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 21:13:29,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 109 transitions. [2020-08-18 21:13:29,426 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 109 transitions. Word has length 71 [2020-08-18 21:13:29,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:29,426 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 109 transitions. [2020-08-18 21:13:29,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 21:13:29,427 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 109 transitions. [2020-08-18 21:13:29,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 21:13:29,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:29,428 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:29,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 21:13:29,428 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:29,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:29,428 INFO L82 PathProgramCache]: Analyzing trace with hash -2089812456, now seen corresponding path program 17 times [2020-08-18 21:13:29,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:29,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1395151477] [2020-08-18 21:13:29,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:29,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:29,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:29,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:29,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2020-08-18 21:13:29,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:29,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2020-08-18 21:13:29,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:29,804 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 21:13:29,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1395151477] [2020-08-18 21:13:29,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:29,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 21:13:29,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469473461] [2020-08-18 21:13:29,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 21:13:29,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:29,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 21:13:29,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=343, Unknown=0, NotChecked=0, Total=600 [2020-08-18 21:13:29,807 INFO L87 Difference]: Start difference. First operand 97 states and 109 transitions. Second operand 25 states. [2020-08-18 21:13:31,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:31,121 INFO L93 Difference]: Finished difference Result 591 states and 804 transitions. [2020-08-18 21:13:31,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 21:13:31,123 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 73 [2020-08-18 21:13:31,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:31,127 INFO L225 Difference]: With dead ends: 591 [2020-08-18 21:13:31,128 INFO L226 Difference]: Without dead ends: 541 [2020-08-18 21:13:31,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=285, Invalid=417, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:13:31,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2020-08-18 21:13:31,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 99. [2020-08-18 21:13:31,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 21:13:31,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 111 transitions. [2020-08-18 21:13:31,139 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 111 transitions. Word has length 73 [2020-08-18 21:13:31,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:31,139 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 111 transitions. [2020-08-18 21:13:31,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 21:13:31,140 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 111 transitions. [2020-08-18 21:13:31,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 21:13:31,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:31,140 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:31,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 21:13:31,141 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:31,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:31,141 INFO L82 PathProgramCache]: Analyzing trace with hash 1299014966, now seen corresponding path program 18 times [2020-08-18 21:13:31,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:31,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929960247] [2020-08-18 21:13:31,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:31,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:31,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:31,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:31,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2020-08-18 21:13:31,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:31,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2020-08-18 21:13:31,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:31,478 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 21:13:31,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [929960247] [2020-08-18 21:13:31,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:31,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 21:13:31,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693907193] [2020-08-18 21:13:31,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 21:13:31,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:31,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 21:13:31,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2020-08-18 21:13:31,485 INFO L87 Difference]: Start difference. First operand 99 states and 111 transitions. Second operand 26 states. [2020-08-18 21:13:32,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:32,775 INFO L93 Difference]: Finished difference Result 614 states and 836 transitions. [2020-08-18 21:13:32,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 21:13:32,776 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-18 21:13:32,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:32,780 INFO L225 Difference]: With dead ends: 614 [2020-08-18 21:13:32,781 INFO L226 Difference]: Without dead ends: 564 [2020-08-18 21:13:32,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2020-08-18 21:13:32,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 564 states. [2020-08-18 21:13:32,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 564 to 101. [2020-08-18 21:13:32,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 21:13:32,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 113 transitions. [2020-08-18 21:13:32,792 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 113 transitions. Word has length 75 [2020-08-18 21:13:32,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:32,793 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 113 transitions. [2020-08-18 21:13:32,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 21:13:32,793 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 113 transitions. [2020-08-18 21:13:32,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-18 21:13:32,794 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:32,794 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:32,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 21:13:32,794 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:32,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:32,795 INFO L82 PathProgramCache]: Analyzing trace with hash -1918010156, now seen corresponding path program 19 times [2020-08-18 21:13:32,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:32,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1608612446] [2020-08-18 21:13:32,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:32,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:33,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:33,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:33,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2020-08-18 21:13:33,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:33,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2020-08-18 21:13:33,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:33,210 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 21:13:33,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1608612446] [2020-08-18 21:13:33,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:33,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 21:13:33,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418092765] [2020-08-18 21:13:33,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 21:13:33,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:33,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 21:13:33,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=398, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:13:33,213 INFO L87 Difference]: Start difference. First operand 101 states and 113 transitions. Second operand 27 states. [2020-08-18 21:13:34,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:34,884 INFO L93 Difference]: Finished difference Result 637 states and 868 transitions. [2020-08-18 21:13:34,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 21:13:34,884 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 77 [2020-08-18 21:13:34,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:34,887 INFO L225 Difference]: With dead ends: 637 [2020-08-18 21:13:34,888 INFO L226 Difference]: Without dead ends: 587 [2020-08-18 21:13:34,888 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=334, Invalid=478, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:13:34,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2020-08-18 21:13:34,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 103. [2020-08-18 21:13:34,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 21:13:34,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 115 transitions. [2020-08-18 21:13:34,898 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 115 transitions. Word has length 77 [2020-08-18 21:13:34,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:34,899 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 115 transitions. [2020-08-18 21:13:34,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 21:13:34,899 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 115 transitions. [2020-08-18 21:13:34,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 21:13:34,900 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:34,900 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:34,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 21:13:34,900 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:34,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:34,901 INFO L82 PathProgramCache]: Analyzing trace with hash -1102699278, now seen corresponding path program 20 times [2020-08-18 21:13:34,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:34,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673136257] [2020-08-18 21:13:34,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:34,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:35,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:35,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:35,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2020-08-18 21:13:35,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:35,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-18 21:13:35,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:35,312 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 21:13:35,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673136257] [2020-08-18 21:13:35,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:35,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 21:13:35,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845035140] [2020-08-18 21:13:35,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 21:13:35,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:35,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 21:13:35,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2020-08-18 21:13:35,315 INFO L87 Difference]: Start difference. First operand 103 states and 115 transitions. Second operand 28 states. [2020-08-18 21:13:37,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:37,137 INFO L93 Difference]: Finished difference Result 660 states and 900 transitions. [2020-08-18 21:13:37,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 21:13:37,138 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 79 [2020-08-18 21:13:37,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:37,140 INFO L225 Difference]: With dead ends: 660 [2020-08-18 21:13:37,141 INFO L226 Difference]: Without dead ends: 610 [2020-08-18 21:13:37,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=360, Invalid=510, Unknown=0, NotChecked=0, Total=870 [2020-08-18 21:13:37,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-08-18 21:13:37,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 105. [2020-08-18 21:13:37,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 21:13:37,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 117 transitions. [2020-08-18 21:13:37,151 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 117 transitions. Word has length 79 [2020-08-18 21:13:37,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:37,151 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 117 transitions. [2020-08-18 21:13:37,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 21:13:37,152 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 117 transitions. [2020-08-18 21:13:37,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 21:13:37,152 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:37,153 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:37,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 21:13:37,153 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:37,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:37,153 INFO L82 PathProgramCache]: Analyzing trace with hash 727006608, now seen corresponding path program 21 times [2020-08-18 21:13:37,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:37,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096167550] [2020-08-18 21:13:37,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:37,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:37,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:37,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:37,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2020-08-18 21:13:37,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:37,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2020-08-18 21:13:37,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:37,594 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 21:13:37,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096167550] [2020-08-18 21:13:37,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:37,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 21:13:37,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220262521] [2020-08-18 21:13:37,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 21:13:37,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:37,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 21:13:37,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=457, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:13:37,597 INFO L87 Difference]: Start difference. First operand 105 states and 117 transitions. Second operand 29 states. [2020-08-18 21:13:39,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:39,620 INFO L93 Difference]: Finished difference Result 683 states and 932 transitions. [2020-08-18 21:13:39,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 21:13:39,621 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 81 [2020-08-18 21:13:39,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:39,625 INFO L225 Difference]: With dead ends: 683 [2020-08-18 21:13:39,625 INFO L226 Difference]: Without dead ends: 633 [2020-08-18 21:13:39,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=387, Invalid=543, Unknown=0, NotChecked=0, Total=930 [2020-08-18 21:13:39,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2020-08-18 21:13:39,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 107. [2020-08-18 21:13:39,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 21:13:39,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 119 transitions. [2020-08-18 21:13:39,648 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 119 transitions. Word has length 81 [2020-08-18 21:13:39,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:39,648 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 119 transitions. [2020-08-18 21:13:39,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 21:13:39,649 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 119 transitions. [2020-08-18 21:13:39,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-18 21:13:39,650 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:39,651 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:39,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 21:13:39,651 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:39,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:39,652 INFO L82 PathProgramCache]: Analyzing trace with hash -1862228306, now seen corresponding path program 22 times [2020-08-18 21:13:39,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:39,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [893779590] [2020-08-18 21:13:39,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:39,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:40,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:40,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:40,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2020-08-18 21:13:40,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:40,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71 [2020-08-18 21:13:40,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:40,392 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 21:13:40,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [893779590] [2020-08-18 21:13:40,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:40,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 21:13:40,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837409394] [2020-08-18 21:13:40,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 21:13:40,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:40,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 21:13:40,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=488, Unknown=0, NotChecked=0, Total=870 [2020-08-18 21:13:40,396 INFO L87 Difference]: Start difference. First operand 107 states and 119 transitions. Second operand 30 states. [2020-08-18 21:13:43,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:43,118 INFO L93 Difference]: Finished difference Result 706 states and 964 transitions. [2020-08-18 21:13:43,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 21:13:43,119 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 83 [2020-08-18 21:13:43,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:43,124 INFO L225 Difference]: With dead ends: 706 [2020-08-18 21:13:43,124 INFO L226 Difference]: Without dead ends: 656 [2020-08-18 21:13:43,126 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=415, Invalid=577, Unknown=0, NotChecked=0, Total=992 [2020-08-18 21:13:43,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 656 states. [2020-08-18 21:13:43,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 656 to 109. [2020-08-18 21:13:43,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 21:13:43,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 121 transitions. [2020-08-18 21:13:43,145 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 121 transitions. Word has length 83 [2020-08-18 21:13:43,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:43,146 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 121 transitions. [2020-08-18 21:13:43,146 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 21:13:43,146 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 121 transitions. [2020-08-18 21:13:43,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-18 21:13:43,148 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:43,148 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:43,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 21:13:43,149 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:43,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:43,150 INFO L82 PathProgramCache]: Analyzing trace with hash 964051020, now seen corresponding path program 23 times [2020-08-18 21:13:43,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:43,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340311724] [2020-08-18 21:13:43,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:43,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:43,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:43,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:43,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2020-08-18 21:13:43,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:43,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2020-08-18 21:13:43,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:43,696 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 21:13:43,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340311724] [2020-08-18 21:13:43,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:43,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 21:13:43,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773689305] [2020-08-18 21:13:43,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 21:13:43,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:43,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 21:13:43,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=520, Unknown=0, NotChecked=0, Total=930 [2020-08-18 21:13:43,698 INFO L87 Difference]: Start difference. First operand 109 states and 121 transitions. Second operand 31 states. [2020-08-18 21:13:45,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:45,875 INFO L93 Difference]: Finished difference Result 729 states and 996 transitions. [2020-08-18 21:13:45,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 21:13:45,875 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 85 [2020-08-18 21:13:45,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:45,878 INFO L225 Difference]: With dead ends: 729 [2020-08-18 21:13:45,879 INFO L226 Difference]: Without dead ends: 679 [2020-08-18 21:13:45,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=444, Invalid=612, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 21:13:45,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2020-08-18 21:13:45,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 111. [2020-08-18 21:13:45,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-18 21:13:45,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 123 transitions. [2020-08-18 21:13:45,890 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 123 transitions. Word has length 85 [2020-08-18 21:13:45,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:45,891 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 123 transitions. [2020-08-18 21:13:45,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 21:13:45,891 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 123 transitions. [2020-08-18 21:13:45,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 21:13:45,892 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:45,892 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:45,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 21:13:45,893 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:45,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:45,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1695815062, now seen corresponding path program 24 times [2020-08-18 21:13:45,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:45,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1917546338] [2020-08-18 21:13:45,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:45,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:46,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:46,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:46,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2020-08-18 21:13:46,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:46,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2020-08-18 21:13:46,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:46,422 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 21:13:46,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1917546338] [2020-08-18 21:13:46,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:46,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 21:13:46,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232204472] [2020-08-18 21:13:46,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 21:13:46,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:46,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 21:13:46,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=553, Unknown=0, NotChecked=0, Total=992 [2020-08-18 21:13:46,425 INFO L87 Difference]: Start difference. First operand 111 states and 123 transitions. Second operand 32 states. [2020-08-18 21:13:48,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:48,204 INFO L93 Difference]: Finished difference Result 752 states and 1028 transitions. [2020-08-18 21:13:48,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 21:13:48,205 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 87 [2020-08-18 21:13:48,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:48,208 INFO L225 Difference]: With dead ends: 752 [2020-08-18 21:13:48,208 INFO L226 Difference]: Without dead ends: 702 [2020-08-18 21:13:48,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=474, Invalid=648, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 21:13:48,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2020-08-18 21:13:48,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 113. [2020-08-18 21:13:48,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-18 21:13:48,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 125 transitions. [2020-08-18 21:13:48,221 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 125 transitions. Word has length 87 [2020-08-18 21:13:48,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:48,221 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 125 transitions. [2020-08-18 21:13:48,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 21:13:48,222 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 125 transitions. [2020-08-18 21:13:48,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-18 21:13:48,222 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:48,223 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:48,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 21:13:48,223 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:48,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:48,223 INFO L82 PathProgramCache]: Analyzing trace with hash 1973388552, now seen corresponding path program 25 times [2020-08-18 21:13:48,224 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:48,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068385362] [2020-08-18 21:13:48,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:48,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:48,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2020-08-18 21:13:48,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2020-08-18 21:13:48,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,296 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2020-08-18 21:13:48,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068385362] [2020-08-18 21:13:48,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:13:48,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 21:13:48,297 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508199651] [2020-08-18 21:13:48,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:13:48,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:48,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:13:48,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:13:48,298 INFO L87 Difference]: Start difference. First operand 113 states and 125 transitions. Second operand 5 states. [2020-08-18 21:13:48,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:48,454 INFO L93 Difference]: Finished difference Result 177 states and 206 transitions. [2020-08-18 21:13:48,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 21:13:48,455 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 89 [2020-08-18 21:13:48,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:48,456 INFO L225 Difference]: With dead ends: 177 [2020-08-18 21:13:48,456 INFO L226 Difference]: Without dead ends: 132 [2020-08-18 21:13:48,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:13:48,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-08-18 21:13:48,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 114. [2020-08-18 21:13:48,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-08-18 21:13:48,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 126 transitions. [2020-08-18 21:13:48,462 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 126 transitions. Word has length 89 [2020-08-18 21:13:48,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:48,462 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 126 transitions. [2020-08-18 21:13:48,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:13:48,462 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 126 transitions. [2020-08-18 21:13:48,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-18 21:13:48,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:48,464 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:48,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 21:13:48,464 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:48,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:48,464 INFO L82 PathProgramCache]: Analyzing trace with hash -1905794714, now seen corresponding path program 1 times [2020-08-18 21:13:48,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:48,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1767964626] [2020-08-18 21:13:48,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:48,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:48,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71 [2020-08-18 21:13:48,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2020-08-18 21:13:48,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,542 INFO L134 CoverageAnalysis]: Checked inductivity of 785 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2020-08-18 21:13:48,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1767964626] [2020-08-18 21:13:48,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:48,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 21:13:48,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680410387] [2020-08-18 21:13:48,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:13:48,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:48,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:13:48,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:13:48,544 INFO L87 Difference]: Start difference. First operand 114 states and 126 transitions. Second operand 6 states. [2020-08-18 21:13:48,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:48,705 INFO L93 Difference]: Finished difference Result 200 states and 238 transitions. [2020-08-18 21:13:48,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:13:48,705 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 91 [2020-08-18 21:13:48,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:48,706 INFO L225 Difference]: With dead ends: 200 [2020-08-18 21:13:48,707 INFO L226 Difference]: Without dead ends: 155 [2020-08-18 21:13:48,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:13:48,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-08-18 21:13:48,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 131. [2020-08-18 21:13:48,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-08-18 21:13:48,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 149 transitions. [2020-08-18 21:13:48,714 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 149 transitions. Word has length 91 [2020-08-18 21:13:48,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:48,714 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 149 transitions. [2020-08-18 21:13:48,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:13:48,714 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 149 transitions. [2020-08-18 21:13:48,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-18 21:13:48,715 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:48,716 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:48,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 21:13:48,716 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:48,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:48,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1769300412, now seen corresponding path program 2 times [2020-08-18 21:13:48,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:48,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [660850080] [2020-08-18 21:13:48,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:48,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:48,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2020-08-18 21:13:48,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2020-08-18 21:13:48,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,827 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 788 trivial. 0 not checked. [2020-08-18 21:13:48,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [660850080] [2020-08-18 21:13:48,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:13:48,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 21:13:48,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048082461] [2020-08-18 21:13:48,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:13:48,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:48,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:13:48,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:13:48,830 INFO L87 Difference]: Start difference. First operand 131 states and 149 transitions. Second operand 6 states. [2020-08-18 21:13:49,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:49,012 INFO L93 Difference]: Finished difference Result 187 states and 222 transitions. [2020-08-18 21:13:49,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:13:49,013 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 93 [2020-08-18 21:13:49,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:49,014 INFO L225 Difference]: With dead ends: 187 [2020-08-18 21:13:49,015 INFO L226 Difference]: Without dead ends: 139 [2020-08-18 21:13:49,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:13:49,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2020-08-18 21:13:49,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 137. [2020-08-18 21:13:49,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2020-08-18 21:13:49,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 157 transitions. [2020-08-18 21:13:49,024 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 157 transitions. Word has length 93 [2020-08-18 21:13:49,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:49,024 INFO L479 AbstractCegarLoop]: Abstraction has 137 states and 157 transitions. [2020-08-18 21:13:49,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:13:49,024 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 157 transitions. [2020-08-18 21:13:49,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-18 21:13:49,026 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:49,026 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:13:49,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 21:13:49,026 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:49,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:49,026 INFO L82 PathProgramCache]: Analyzing trace with hash -351711109, now seen corresponding path program 1 times [2020-08-18 21:13:49,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:49,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2070688901] [2020-08-18 21:13:49,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:49,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:49,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:49,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:49,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2020-08-18 21:13:49,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:49,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2020-08-18 21:13:49,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:49,140 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 788 trivial. 0 not checked. [2020-08-18 21:13:49,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2070688901] [2020-08-18 21:13:49,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:13:49,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-18 21:13:49,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291707273] [2020-08-18 21:13:49,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:13:49,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:49,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:13:49,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:13:49,142 INFO L87 Difference]: Start difference. First operand 137 states and 157 transitions. Second operand 7 states. [2020-08-18 21:13:49,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:49,271 INFO L93 Difference]: Finished difference Result 157 states and 181 transitions. [2020-08-18 21:13:49,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 21:13:49,273 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 93 [2020-08-18 21:13:49,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:49,274 INFO L225 Difference]: With dead ends: 157 [2020-08-18 21:13:49,274 INFO L226 Difference]: Without dead ends: 0 [2020-08-18 21:13:49,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:13:49,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-18 21:13:49,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-18 21:13:49,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-18 21:13:49,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-18 21:13:49,278 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 93 [2020-08-18 21:13:49,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:49,278 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-18 21:13:49,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:13:49,278 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-18 21:13:49,278 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-18 21:13:49,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 21:13:49,283 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-18 21:13:49,539 INFO L271 CegarLoopResult]: At program point elem_existsENTRY(lines 9 15) the Hoare annotation is: true [2020-08-18 21:13:49,540 INFO L268 CegarLoopResult]: For program point elem_existsEXIT(lines 9 15) no Hoare annotation was computed. [2020-08-18 21:13:49,540 INFO L268 CegarLoopResult]: For program point L12(line 12) no Hoare annotation was computed. [2020-08-18 21:13:49,540 INFO L268 CegarLoopResult]: For program point L11-2(lines 11 13) no Hoare annotation was computed. [2020-08-18 21:13:49,540 INFO L268 CegarLoopResult]: For program point elem_existsFINAL(lines 9 15) no Hoare annotation was computed. [2020-08-18 21:13:49,540 INFO L264 CegarLoopResult]: At program point L11-3(lines 11 13) the Hoare annotation is: (and (<= 0 elem_exists_~i~0) (= elem_exists_~size |elem_exists_#in~size|)) [2020-08-18 21:13:49,540 INFO L268 CegarLoopResult]: For program point L11-4(lines 11 13) no Hoare annotation was computed. [2020-08-18 21:13:49,541 INFO L268 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-08-18 21:13:49,541 INFO L264 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |old(#NULL.base)| |#NULL.base|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2020-08-18 21:13:49,541 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-18 21:13:49,541 INFO L271 CegarLoopResult]: At program point insertENTRY(lines 5 8) the Hoare annotation is: true [2020-08-18 21:13:49,541 INFO L268 CegarLoopResult]: For program point insertFINAL(lines 5 8) no Hoare annotation was computed. [2020-08-18 21:13:49,541 INFO L268 CegarLoopResult]: For program point insertEXIT(lines 5 8) no Hoare annotation was computed. [2020-08-18 21:13:49,541 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-18 21:13:49,541 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-18 21:13:49,541 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-18 21:13:49,542 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-18 21:13:49,542 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 16 56) no Hoare annotation was computed. [2020-08-18 21:13:49,542 INFO L264 CegarLoopResult]: At program point L52(line 52) the Hoare annotation is: false [2020-08-18 21:13:49,542 INFO L268 CegarLoopResult]: For program point L52-1(line 52) no Hoare annotation was computed. [2020-08-18 21:13:49,542 INFO L268 CegarLoopResult]: For program point L44-2(lines 44 48) no Hoare annotation was computed. [2020-08-18 21:13:49,542 INFO L264 CegarLoopResult]: At program point L44-3(lines 44 48) the Hoare annotation is: (and (= main_~x~0 0) (= main_~n~0 0)) [2020-08-18 21:13:49,542 INFO L268 CegarLoopResult]: For program point L36-2(lines 36 39) no Hoare annotation was computed. [2020-08-18 21:13:49,542 INFO L264 CegarLoopResult]: At program point L36-3(lines 36 39) the Hoare annotation is: (and (= main_~x~0 0) (= main_~n~0 0)) [2020-08-18 21:13:49,543 INFO L268 CegarLoopResult]: For program point L36-4(lines 36 39) no Hoare annotation was computed. [2020-08-18 21:13:49,543 INFO L268 CegarLoopResult]: For program point L28-2(lines 28 32) no Hoare annotation was computed. [2020-08-18 21:13:49,543 INFO L264 CegarLoopResult]: At program point L28-3(lines 28 32) the Hoare annotation is: (and (= main_~x~0 0) (= main_~n~0 0)) [2020-08-18 21:13:49,543 INFO L268 CegarLoopResult]: For program point L28-4(lines 28 32) no Hoare annotation was computed. [2020-08-18 21:13:49,543 INFO L268 CegarLoopResult]: For program point L45-2(lines 45 47) no Hoare annotation was computed. [2020-08-18 21:13:49,543 INFO L264 CegarLoopResult]: At program point L45-3(lines 45 47) the Hoare annotation is: false [2020-08-18 21:13:49,543 INFO L268 CegarLoopResult]: For program point L29-2(lines 29 31) no Hoare annotation was computed. [2020-08-18 21:13:49,543 INFO L264 CegarLoopResult]: At program point L29-3(lines 29 31) the Hoare annotation is: false [2020-08-18 21:13:49,544 INFO L264 CegarLoopResult]: At program point L46(line 46) the Hoare annotation is: false [2020-08-18 21:13:49,544 INFO L268 CegarLoopResult]: For program point L46-1(line 46) no Hoare annotation was computed. [2020-08-18 21:13:49,544 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 16 56) no Hoare annotation was computed. [2020-08-18 21:13:49,544 INFO L264 CegarLoopResult]: At program point L30(line 30) the Hoare annotation is: false [2020-08-18 21:13:49,544 INFO L264 CegarLoopResult]: At program point mainENTRY(lines 16 56) the Hoare annotation is: (and (= |#memory_int| |old(#memory_int)|) (= |old(#valid)| |#valid|)) [2020-08-18 21:13:49,544 INFO L268 CegarLoopResult]: For program point L30-1(line 30) no Hoare annotation was computed. [2020-08-18 21:13:49,544 INFO L268 CegarLoopResult]: For program point L22-2(lines 22 25) no Hoare annotation was computed. [2020-08-18 21:13:49,544 INFO L264 CegarLoopResult]: At program point L22-3(lines 22 25) the Hoare annotation is: (= main_~n~0 0) [2020-08-18 21:13:49,545 INFO L268 CegarLoopResult]: For program point L22-4(lines 22 25) no Hoare annotation was computed. [2020-08-18 21:13:49,545 INFO L268 CegarLoopResult]: For program point L40-2(lines 40 49) no Hoare annotation was computed. [2020-08-18 21:13:49,545 INFO L264 CegarLoopResult]: At program point L40-3(lines 40 49) the Hoare annotation is: (and (= main_~x~0 0) (= main_~n~0 0)) [2020-08-18 21:13:49,545 INFO L268 CegarLoopResult]: For program point L40-4(lines 40 49) no Hoare annotation was computed. [2020-08-18 21:13:49,545 INFO L264 CegarLoopResult]: At program point L41(line 41) the Hoare annotation is: (and (= main_~x~0 0) (= main_~n~0 0)) [2020-08-18 21:13:49,545 INFO L268 CegarLoopResult]: For program point L41-1(line 41) no Hoare annotation was computed. [2020-08-18 21:13:49,545 INFO L268 CegarLoopResult]: For program point L41-2(lines 41 43) no Hoare annotation was computed. [2020-08-18 21:13:49,545 INFO L268 CegarLoopResult]: For program point L41-4(lines 41 43) no Hoare annotation was computed. [2020-08-18 21:13:49,546 INFO L268 CegarLoopResult]: For program point L50-2(lines 50 54) no Hoare annotation was computed. [2020-08-18 21:13:49,546 INFO L264 CegarLoopResult]: At program point L50-3(lines 50 54) the Hoare annotation is: (and (= main_~x~0 0) (= main_~n~0 0)) [2020-08-18 21:13:49,546 INFO L268 CegarLoopResult]: For program point L50-4(lines 50 54) no Hoare annotation was computed. [2020-08-18 21:13:49,546 INFO L264 CegarLoopResult]: At program point L42(line 42) the Hoare annotation is: false [2020-08-18 21:13:49,546 INFO L268 CegarLoopResult]: For program point L42-1(line 42) no Hoare annotation was computed. [2020-08-18 21:13:49,546 INFO L268 CegarLoopResult]: For program point L51-2(lines 51 53) no Hoare annotation was computed. [2020-08-18 21:13:49,546 INFO L264 CegarLoopResult]: At program point L51-3(lines 51 53) the Hoare annotation is: false [2020-08-18 21:13:49,547 INFO L268 CegarLoopResult]: For program point L2-1(line 2) no Hoare annotation was computed. [2020-08-18 21:13:49,547 INFO L268 CegarLoopResult]: For program point L2-3(line 2) no Hoare annotation was computed. [2020-08-18 21:13:49,547 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(line 2) the Hoare annotation is: true [2020-08-18 21:13:49,547 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(line 2) no Hoare annotation was computed. [2020-08-18 21:13:49,547 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 2) no Hoare annotation was computed. [2020-08-18 21:13:49,547 INFO L268 CegarLoopResult]: For program point L2(line 2) no Hoare annotation was computed. [2020-08-18 21:13:49,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 09:13:49 BoogieIcfgContainer [2020-08-18 21:13:49,569 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 21:13:49,571 INFO L168 Benchmark]: Toolchain (without parser) took 40545.27 ms. Allocated memory was 138.9 MB in the beginning and 468.7 MB in the end (delta: 329.8 MB). Free memory was 101.7 MB in the beginning and 218.0 MB in the end (delta: -116.3 MB). Peak memory consumption was 213.5 MB. Max. memory is 7.1 GB. [2020-08-18 21:13:49,572 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.1 MB in the end (delta: 420.0 kB). Peak memory consumption was 420.0 kB. Max. memory is 7.1 GB. [2020-08-18 21:13:49,573 INFO L168 Benchmark]: CACSL2BoogieTranslator took 431.64 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 101.3 MB in the beginning and 179.7 MB in the end (delta: -78.4 MB). Peak memory consumption was 22.9 MB. Max. memory is 7.1 GB. [2020-08-18 21:13:49,573 INFO L168 Benchmark]: Boogie Preprocessor took 43.52 ms. Allocated memory is still 201.3 MB. Free memory was 179.7 MB in the beginning and 177.4 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 7.1 GB. [2020-08-18 21:13:49,574 INFO L168 Benchmark]: RCFGBuilder took 442.58 ms. Allocated memory is still 201.3 MB. Free memory was 177.4 MB in the beginning and 153.9 MB in the end (delta: 23.5 MB). Peak memory consumption was 23.5 MB. Max. memory is 7.1 GB. [2020-08-18 21:13:49,574 INFO L168 Benchmark]: TraceAbstraction took 39622.97 ms. Allocated memory was 201.3 MB in the beginning and 468.7 MB in the end (delta: 267.4 MB). Free memory was 152.9 MB in the beginning and 218.0 MB in the end (delta: -65.1 MB). Peak memory consumption was 202.3 MB. Max. memory is 7.1 GB. [2020-08-18 21:13:49,577 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.1 MB in the end (delta: 420.0 kB). Peak memory consumption was 420.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 431.64 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 101.3 MB in the beginning and 179.7 MB in the end (delta: -78.4 MB). Peak memory consumption was 22.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 43.52 ms. Allocated memory is still 201.3 MB. Free memory was 179.7 MB in the beginning and 177.4 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 442.58 ms. Allocated memory is still 201.3 MB. Free memory was 177.4 MB in the beginning and 153.9 MB in the end (delta: 23.5 MB). Peak memory consumption was 23.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 39622.97 ms. Allocated memory was 201.3 MB in the beginning and 468.7 MB in the end (delta: 267.4 MB). Free memory was 152.9 MB in the beginning and 218.0 MB in the end (delta: -65.1 MB). Peak memory consumption was 202.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 2]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 36]: Loop Invariant Derived loop invariant: x == 0 && n == 0 - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: n == 0 - InvariantResult [Line: 28]: Loop Invariant Derived loop invariant: x == 0 && n == 0 - InvariantResult [Line: 44]: Loop Invariant Derived loop invariant: x == 0 && n == 0 - InvariantResult [Line: 11]: Loop Invariant Derived loop invariant: 0 <= i && size == \old(size) - InvariantResult [Line: 50]: Loop Invariant Derived loop invariant: x == 0 && n == 0 - InvariantResult [Line: 29]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 45]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 40]: Loop Invariant Derived loop invariant: x == 0 && n == 0 - InvariantResult [Line: 51]: Loop Invariant Derived loop invariant: 0 - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 61 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 39.2s, OverallIterations: 33, TraceHistogramMax: 28, AutomataDifference: 30.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 3341 SDtfs, 10177 SDslu, 14445 SDs, 0 SdLazy, 26514 SolverSat, 5300 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 20.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 743 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 533 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 780 ImplicationChecksByTransitivity, 6.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=137occurred in iteration=32, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 33 MinimizatonAttempts, 8700 StatesRemovedByMinimization, 32 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 22 LocationsWithAnnotation, 250 PreInvPairs, 290 NumberOfFragments, 81 HoareAnnotationTreeSize, 250 FomulaSimplifications, 452 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 22 FomulaSimplificationsInter, 33 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 7.1s InterpolantComputationTime, 1992 NumberOfCodeBlocks, 1992 NumberOfCodeBlocksAsserted, 33 NumberOfCheckSat, 1959 ConstructedInterpolants, 0 QuantifiedInterpolants, 278362 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 33 InterpolantComputations, 5 PerfectInterpolantSequences, 3160/10091 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...