/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 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 16:23:14,044 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 16:23:14,047 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 16:23:14,085 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 16:23:14,086 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 16:23:14,093 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 16:23:14,096 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 16:23:14,100 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 16:23:14,101 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 16:23:14,102 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 16:23:14,103 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 16:23:14,105 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 16:23:14,105 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 16:23:14,107 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 16:23:14,108 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 16:23:14,109 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 16:23:14,111 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 16:23:14,112 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 16:23:14,114 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 16:23:14,121 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 16:23:14,124 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 16:23:14,125 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 16:23:14,126 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 16:23:14,127 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 16:23:14,137 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 16:23:14,146 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 16:23:14,148 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 16:23:14,149 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 16:23:14,149 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 16:23:14,188 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 16:23:14,188 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 16:23:14,190 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 16:23:14,190 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 16:23:14,190 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 16:23:14,191 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 16:23:14,191 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 16:23:14,191 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 16:23:14,191 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 16:23:14,192 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 16:23:14,193 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 16:23:14,193 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 16:23:14,193 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 16:23:14,193 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 16:23:14,194 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 16:23:14,194 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 16:23:14,194 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 16:23:14,194 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 16:23:14,194 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 16:23:14,195 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 16:23:14,195 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 16:23:14,195 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:23:14,195 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 16:23:14,195 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 16:23:14,195 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 16:23:14,196 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 16:23:14,196 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 16:23:14,196 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 16:23:14,196 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 16:23:14,196 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 [2020-08-18 16:23:14,508 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 16:23:14,519 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 16:23:14,522 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 16:23:14,524 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 16:23:14,524 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 16:23:14,525 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-18 16:23:14,584 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/34f180f81/ebd1dd54db784175a80f0da3b1e40225/FLAGa165c595b [2020-08-18 16:23:15,018 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 16:23:15,019 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-18 16:23:15,029 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/34f180f81/ebd1dd54db784175a80f0da3b1e40225/FLAGa165c595b [2020-08-18 16:23:15,411 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/34f180f81/ebd1dd54db784175a80f0da3b1e40225 [2020-08-18 16:23:15,420 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 16:23:15,422 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 16:23:15,423 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 16:23:15,424 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 16:23:15,427 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 16:23:15,428 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:23:15" (1/1) ... [2020-08-18 16:23:15,431 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a1d4b70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:15, skipping insertion in model container [2020-08-18 16:23:15,432 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:23:15" (1/1) ... [2020-08-18 16:23:15,439 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 16:23:15,456 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 16:23:15,661 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:23:15,668 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 16:23:15,684 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:23:15,698 INFO L208 MainTranslator]: Completed translation [2020-08-18 16:23:15,699 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:15 WrapperNode [2020-08-18 16:23:15,699 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 16:23:15,700 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 16:23:15,700 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 16:23:15,700 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 16:23:15,798 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:15" (1/1) ... [2020-08-18 16:23:15,798 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:15" (1/1) ... [2020-08-18 16:23:15,808 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:15" (1/1) ... [2020-08-18 16:23:15,808 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:15" (1/1) ... [2020-08-18 16:23:15,820 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:15" (1/1) ... [2020-08-18 16:23:15,825 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:15" (1/1) ... [2020-08-18 16:23:15,827 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:15" (1/1) ... [2020-08-18 16:23:15,829 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 16:23:15,829 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 16:23:15,829 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 16:23:15,830 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 16:23:15,830 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:15" (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 16:23:15,892 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 16:23:15,893 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 16:23:15,893 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 16:23:15,893 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 16:23:15,893 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 16:23:15,893 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 16:23:15,893 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 16:23:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 16:23:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 16:23:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 16:23:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 16:23:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 16:23:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 16:23:15,894 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 16:23:15,895 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 16:23:15,895 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 16:23:15,896 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 16:23:16,141 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 16:23:16,142 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 16:23:16,147 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:23:16 BoogieIcfgContainer [2020-08-18 16:23:16,148 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 16:23:16,149 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 16:23:16,149 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 16:23:16,153 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 16:23:16,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 04:23:15" (1/3) ... [2020-08-18 16:23:16,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68fa846d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:23:16, skipping insertion in model container [2020-08-18 16:23:16,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:15" (2/3) ... [2020-08-18 16:23:16,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68fa846d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:23:16, skipping insertion in model container [2020-08-18 16:23:16,156 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:23:16" (3/3) ... [2020-08-18 16:23:16,158 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-18 16:23:16,171 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 16:23:16,178 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 16:23:16,193 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 16:23:16,222 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 16:23:16,222 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 16:23:16,222 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 16:23:16,222 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 16:23:16,223 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 16:23:16,223 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 16:23:16,223 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 16:23:16,223 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 16:23:16,242 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 16:23:16,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 16:23:16,249 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:16,250 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:16,250 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:16,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:16,256 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-18 16:23:16,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:16,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1910795167] [2020-08-18 16:23:16,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:16,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:16,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:16,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:16,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:16,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:16,484 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 16:23:16,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1910795167] [2020-08-18 16:23:16,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:16,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 16:23:16,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922334293] [2020-08-18 16:23:16,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 16:23:16,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:16,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 16:23:16,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:23:16,514 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 16:23:16,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:16,652 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 16:23:16,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 16:23:16,654 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 16:23:16,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:16,665 INFO L225 Difference]: With dead ends: 59 [2020-08-18 16:23:16,665 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 16:23:16,669 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:23:16,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 16:23:16,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 16:23:16,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 16:23:16,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 16:23:16,712 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 16:23:16,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:16,713 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 16:23:16,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 16:23:16,713 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 16:23:16,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 16:23:16,714 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:16,715 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:16,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 16:23:16,715 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:16,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:16,716 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-18 16:23:16,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:16,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [76216910] [2020-08-18 16:23:16,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:16,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:16,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:16,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:16,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:16,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:16,893 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 16:23:16,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [76216910] [2020-08-18 16:23:16,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:16,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 16:23:16,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260894136] [2020-08-18 16:23:16,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 16:23:16,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:16,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 16:23:16,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:23:16,898 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 16:23:17,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:17,092 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 16:23:17,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 16:23:17,093 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 16:23:17,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:17,094 INFO L225 Difference]: With dead ends: 48 [2020-08-18 16:23:17,094 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 16:23:17,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-18 16:23:17,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 16:23:17,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 16:23:17,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 16:23:17,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 16:23:17,104 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 16:23:17,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:17,104 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 16:23:17,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 16:23:17,104 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 16:23:17,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 16:23:17,105 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:17,106 INFO L422 BasicCegarLoop]: trace histogram [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 16:23:17,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 16:23:17,106 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:17,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:17,106 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-18 16:23:17,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:17,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [661267588] [2020-08-18 16:23:17,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:17,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:17,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:17,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:17,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:17,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:17,267 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 16:23:17,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [661267588] [2020-08-18 16:23:17,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:17,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 16:23:17,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806570222] [2020-08-18 16:23:17,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 16:23:17,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:17,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 16:23:17,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:23:17,270 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 16:23:17,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:17,430 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 16:23:17,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 16:23:17,431 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 16:23:17,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:17,432 INFO L225 Difference]: With dead ends: 50 [2020-08-18 16:23:17,432 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 16:23:17,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 16:23:17,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 16:23:17,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 16:23:17,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 16:23:17,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 16:23:17,440 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 16:23:17,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:17,441 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 16:23:17,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 16:23:17,441 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 16:23:17,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 16:23:17,442 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:17,442 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:17,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 16:23:17,442 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:17,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:17,443 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-18 16:23:17,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:17,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140787902] [2020-08-18 16:23:17,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:17,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:17,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:17,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:17,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:17,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:17,653 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 16:23:17,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140787902] [2020-08-18 16:23:17,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:17,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 16:23:17,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238455591] [2020-08-18 16:23:17,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 16:23:17,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:17,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 16:23:17,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 16:23:17,657 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 16:23:17,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:17,854 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 16:23:17,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 16:23:17,855 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 16:23:17,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:17,856 INFO L225 Difference]: With dead ends: 52 [2020-08-18 16:23:17,857 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 16:23:17,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:23:17,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 16:23:17,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 16:23:17,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 16:23:17,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 16:23:17,874 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 16:23:17,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:17,875 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 16:23:17,875 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 16:23:17,875 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 16:23:17,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 16:23:17,877 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:17,877 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:17,877 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 16:23:17,877 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:17,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:17,878 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-18 16:23:17,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:17,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575328929] [2020-08-18 16:23:17,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:17,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:17,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:17,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:17,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:17,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:18,151 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 16:23:18,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [575328929] [2020-08-18 16:23:18,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:18,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 16:23:18,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163282691] [2020-08-18 16:23:18,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 16:23:18,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:18,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 16:23:18,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 16:23:18,155 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 16:23:18,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:18,331 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 16:23:18,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 16:23:18,332 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 16:23:18,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:18,333 INFO L225 Difference]: With dead ends: 54 [2020-08-18 16:23:18,333 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 16:23:18,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:23:18,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 16:23:18,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 16:23:18,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 16:23:18,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 16:23:18,344 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 16:23:18,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:18,344 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 16:23:18,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 16:23:18,345 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 16:23:18,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 16:23:18,348 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:18,348 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] [2020-08-18 16:23:18,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 16:23:18,349 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:18,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:18,349 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-18 16:23:18,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:18,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718467508] [2020-08-18 16:23:18,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:18,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:18,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:18,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:18,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:18,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:18,609 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 16:23:18,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718467508] [2020-08-18 16:23:18,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:18,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 16:23:18,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888625057] [2020-08-18 16:23:18,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 16:23:18,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:18,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 16:23:18,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 16:23:18,612 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 16:23:18,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:18,761 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 16:23:18,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 16:23:18,761 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 16:23:18,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:18,762 INFO L225 Difference]: With dead ends: 56 [2020-08-18 16:23:18,762 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 16:23:18,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:23:18,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 16:23:18,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 16:23:18,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 16:23:18,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 16:23:18,769 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 16:23:18,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:18,769 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 16:23:18,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 16:23:18,770 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 16:23:18,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 16:23:18,771 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:18,771 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] [2020-08-18 16:23:18,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 16:23:18,771 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:18,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:18,772 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-18 16:23:18,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:18,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974949342] [2020-08-18 16:23:18,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:18,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:18,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:18,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:18,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:18,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,056 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 16:23:19,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974949342] [2020-08-18 16:23:19,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:19,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 16:23:19,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640197902] [2020-08-18 16:23:19,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 16:23:19,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:19,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 16:23:19,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:23:19,059 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 16:23:19,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:19,254 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 16:23:19,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 16:23:19,257 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 16:23:19,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:19,258 INFO L225 Difference]: With dead ends: 58 [2020-08-18 16:23:19,258 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 16:23:19,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-18 16:23:19,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 16:23:19,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 16:23:19,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 16:23:19,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 16:23:19,264 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 16:23:19,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:19,265 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 16:23:19,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 16:23:19,265 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 16:23:19,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 16:23:19,266 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:19,266 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] [2020-08-18 16:23:19,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 16:23:19,266 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:19,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:19,267 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-18 16:23:19,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:19,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044722708] [2020-08-18 16:23:19,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:19,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:19,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:19,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,545 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 16:23:19,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044722708] [2020-08-18 16:23:19,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:19,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 16:23:19,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018755170] [2020-08-18 16:23:19,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 16:23:19,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:19,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 16:23:19,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:23:19,548 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 16:23:19,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:19,756 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 16:23:19,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 16:23:19,757 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 16:23:19,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:19,758 INFO L225 Difference]: With dead ends: 60 [2020-08-18 16:23:19,758 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 16:23:19,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-18 16:23:19,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 16:23:19,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 16:23:19,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 16:23:19,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 16:23:19,769 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 16:23:19,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:19,770 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 16:23:19,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 16:23:19,770 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 16:23:19,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 16:23:19,771 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:19,771 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] [2020-08-18 16:23:19,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 16:23:19,772 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:19,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:19,772 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-18 16:23:19,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:19,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1734381618] [2020-08-18 16:23:19,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:19,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:19,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:19,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:20,119 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 16:23:20,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1734381618] [2020-08-18 16:23:20,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:20,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 16:23:20,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445936360] [2020-08-18 16:23:20,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 16:23:20,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:20,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 16:23:20,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:23:20,126 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 16:23:20,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:20,320 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 16:23:20,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 16:23:20,321 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 16:23:20,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:20,322 INFO L225 Difference]: With dead ends: 62 [2020-08-18 16:23:20,322 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 16:23:20,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-18 16:23:20,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 16:23:20,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 16:23:20,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 16:23:20,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 16:23:20,335 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 16:23:20,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:20,335 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 16:23:20,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 16:23:20,336 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 16:23:20,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 16:23:20,338 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:20,338 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] [2020-08-18 16:23:20,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 16:23:20,339 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:20,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:20,340 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-18 16:23:20,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:20,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1629415929] [2020-08-18 16:23:20,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:20,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:20,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:20,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:20,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:20,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:20,767 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 16:23:20,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1629415929] [2020-08-18 16:23:20,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:20,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 16:23:20,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429689282] [2020-08-18 16:23:20,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 16:23:20,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:20,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 16:23:20,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 16:23:20,770 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 16:23:20,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:20,991 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 16:23:20,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 16:23:20,991 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 16:23:20,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:20,992 INFO L225 Difference]: With dead ends: 64 [2020-08-18 16:23:20,992 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 16:23:20,993 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-18 16:23:20,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 16:23:21,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 16:23:21,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 16:23:21,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 16:23:21,004 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 16:23:21,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:21,004 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 16:23:21,004 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 16:23:21,004 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 16:23:21,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 16:23:21,005 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:21,005 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] [2020-08-18 16:23:21,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 16:23:21,006 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:21,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:21,006 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-18 16:23:21,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:21,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1790855043] [2020-08-18 16:23:21,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:21,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:21,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:21,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,059 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 16:23:21,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1790855043] [2020-08-18 16:23:21,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:21,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 16:23:21,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104114727] [2020-08-18 16:23:21,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 16:23:21,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:21,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 16:23:21,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:23:21,062 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 16:23:21,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:21,141 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 16:23:21,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 16:23:21,141 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 16:23:21,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:21,143 INFO L225 Difference]: With dead ends: 65 [2020-08-18 16:23:21,143 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 16:23:21,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 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 16:23:21,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 16:23:21,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 16:23:21,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 16:23:21,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 16:23:21,154 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 16:23:21,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:21,154 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 16:23:21,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 16:23:21,154 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 16:23:21,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 16:23:21,155 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:21,155 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] [2020-08-18 16:23:21,155 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 16:23:21,155 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:21,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:21,156 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-18 16:23:21,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:21,156 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591285330] [2020-08-18 16:23:21,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:21,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:21,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:21,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,213 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 16:23:21,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591285330] [2020-08-18 16:23:21,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:21,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 16:23:21,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174336545] [2020-08-18 16:23:21,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 16:23:21,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:21,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 16:23:21,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:23:21,216 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 16:23:21,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:21,327 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 16:23:21,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 16:23:21,327 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 16:23:21,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:21,328 INFO L225 Difference]: With dead ends: 73 [2020-08-18 16:23:21,328 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 16:23:21,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 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 16:23:21,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 16:23:21,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 16:23:21,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 16:23:21,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 16:23:21,336 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 16:23:21,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:21,336 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 16:23:21,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 16:23:21,337 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 16:23:21,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 16:23:21,338 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:21,338 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:21,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 16:23:21,338 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:21,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:21,339 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-18 16:23:21,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:21,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300372261] [2020-08-18 16:23:21,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:21,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:21,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:21,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,415 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-18 16:23:21,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300372261] [2020-08-18 16:23:21,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:21,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 16:23:21,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802701793] [2020-08-18 16:23:21,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 16:23:21,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:21,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 16:23:21,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:23:21,417 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 16:23:21,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:21,497 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 16:23:21,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 16:23:21,498 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 16:23:21,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:21,499 INFO L225 Difference]: With dead ends: 69 [2020-08-18 16:23:21,499 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 16:23:21,500 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 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 16:23:21,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 16:23:21,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 16:23:21,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 16:23:21,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 16:23:21,505 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 16:23:21,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:21,505 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 16:23:21,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 16:23:21,506 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 16:23:21,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 16:23:21,506 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:21,506 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:21,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 16:23:21,507 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:21,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:21,507 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-18 16:23:21,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:21,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1426493004] [2020-08-18 16:23:21,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:21,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:21,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:21,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,950 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:21,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1426493004] [2020-08-18 16:23:21,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:21,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 16:23:21,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678357182] [2020-08-18 16:23:21,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 16:23:21,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:21,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 16:23:21,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 16:23:21,953 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 16:23:22,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:22,162 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 16:23:22,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 16:23:22,162 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 16:23:22,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:22,163 INFO L225 Difference]: With dead ends: 74 [2020-08-18 16:23:22,163 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 16:23:22,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-18 16:23:22,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 16:23:22,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 16:23:22,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 16:23:22,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 16:23:22,170 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 16:23:22,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:22,171 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 16:23:22,171 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 16:23:22,171 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 16:23:22,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 16:23:22,172 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:22,172 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:22,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 16:23:22,173 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:22,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:22,173 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-18 16:23:22,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:22,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126528234] [2020-08-18 16:23:22,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:22,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:22,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:22,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:22,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:22,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:22,643 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:22,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126528234] [2020-08-18 16:23:22,644 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:22,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 16:23:22,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273450129] [2020-08-18 16:23:22,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 16:23:22,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:22,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 16:23:22,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 16:23:22,645 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 16:23:22,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:22,876 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 16:23:22,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 16:23:22,877 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 16:23:22,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:22,877 INFO L225 Difference]: With dead ends: 76 [2020-08-18 16:23:22,878 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 16:23:22,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:23:22,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 16:23:22,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 16:23:22,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 16:23:22,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 16:23:22,884 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 16:23:22,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:22,885 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 16:23:22,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 16:23:22,885 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 16:23:22,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 16:23:22,886 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:22,886 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:22,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 16:23:22,886 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:22,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:22,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-18 16:23:22,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:22,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130658369] [2020-08-18 16:23:22,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:22,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:22,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:22,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:22,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:22,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,442 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:23,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130658369] [2020-08-18 16:23:23,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:23,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 16:23:23,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602108182] [2020-08-18 16:23:23,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 16:23:23,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:23,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 16:23:23,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 16:23:23,447 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 16:23:23,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:23,660 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 16:23:23,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 16:23:23,661 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 16:23:23,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:23,662 INFO L225 Difference]: With dead ends: 78 [2020-08-18 16:23:23,662 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 16:23:23,662 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-18 16:23:23,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 16:23:23,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 16:23:23,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 16:23:23,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 16:23:23,669 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 16:23:23,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:23,669 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 16:23:23,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 16:23:23,669 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 16:23:23,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 16:23:23,670 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:23,670 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:23,670 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 16:23:23,670 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:23,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:23,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-18 16:23:23,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:23,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094033438] [2020-08-18 16:23:23,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:23,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:23,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:23,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:24,258 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:24,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2094033438] [2020-08-18 16:23:24,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:24,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 16:23:24,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646657298] [2020-08-18 16:23:24,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 16:23:24,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:24,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 16:23:24,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 16:23:24,260 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 16:23:24,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:24,510 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 16:23:24,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 16:23:24,511 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 16:23:24,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:24,511 INFO L225 Difference]: With dead ends: 80 [2020-08-18 16:23:24,512 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 16:23:24,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:23:24,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 16:23:24,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 16:23:24,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 16:23:24,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 16:23:24,518 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 16:23:24,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:24,519 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 16:23:24,519 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 16:23:24,519 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 16:23:24,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 16:23:24,520 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:24,520 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:24,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 16:23:24,520 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:24,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:24,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-18 16:23:24,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:24,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2075919799] [2020-08-18 16:23:24,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:24,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:24,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:24,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:24,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:24,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:25,103 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:25,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2075919799] [2020-08-18 16:23:25,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:25,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 16:23:25,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369632706] [2020-08-18 16:23:25,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 16:23:25,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:25,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 16:23:25,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:23:25,105 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 16:23:25,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:25,356 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 16:23:25,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 16:23:25,356 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 16:23:25,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:25,357 INFO L225 Difference]: With dead ends: 82 [2020-08-18 16:23:25,357 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 16:23:25,359 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 16:23:25,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 16:23:25,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 16:23:25,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 16:23:25,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 16:23:25,364 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 16:23:25,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:25,364 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 16:23:25,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 16:23:25,364 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 16:23:25,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 16:23:25,365 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:25,365 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:25,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 16:23:25,366 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:25,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:25,366 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-18 16:23:25,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:25,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2111259563] [2020-08-18 16:23:25,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:25,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:25,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:25,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:25,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:25,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:25,982 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:25,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2111259563] [2020-08-18 16:23:25,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:25,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 16:23:25,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171988531] [2020-08-18 16:23:25,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 16:23:25,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:25,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 16:23:25,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 16:23:25,985 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 16:23:26,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:26,249 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 16:23:26,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 16:23:26,250 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 16:23:26,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:26,251 INFO L225 Difference]: With dead ends: 84 [2020-08-18 16:23:26,251 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 16:23:26,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:23:26,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 16:23:26,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 16:23:26,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 16:23:26,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 16:23:26,258 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 16:23:26,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:26,259 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 16:23:26,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 16:23:26,259 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 16:23:26,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 16:23:26,260 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:26,260 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:26,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 16:23:26,260 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:26,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:26,260 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-18 16:23:26,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:26,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2034129121] [2020-08-18 16:23:26,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:26,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:26,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:26,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:26,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:26,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:27,057 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:27,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2034129121] [2020-08-18 16:23:27,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:27,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 16:23:27,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738882513] [2020-08-18 16:23:27,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 16:23:27,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:27,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 16:23:27,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:23:27,061 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 16:23:27,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:27,248 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 16:23:27,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 16:23:27,249 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 16:23:27,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:27,249 INFO L225 Difference]: With dead ends: 86 [2020-08-18 16:23:27,250 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 16:23:27,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:23:27,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 16:23:27,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 16:23:27,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 16:23:27,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 16:23:27,255 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 16:23:27,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:27,255 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 16:23:27,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 16:23:27,255 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 16:23:27,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 16:23:27,256 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:27,256 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:27,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 16:23:27,257 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:27,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:27,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-18 16:23:27,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:27,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2056074612] [2020-08-18 16:23:27,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:27,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:27,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:27,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:27,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:27,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:28,038 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:28,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2056074612] [2020-08-18 16:23:28,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:28,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 16:23:28,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280752862] [2020-08-18 16:23:28,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 16:23:28,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:28,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 16:23:28,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 16:23:28,040 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 16:23:28,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:28,337 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 16:23:28,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 16:23:28,338 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 16:23:28,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:28,338 INFO L225 Difference]: With dead ends: 88 [2020-08-18 16:23:28,339 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 16:23:28,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-18 16:23:28,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 16:23:28,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 16:23:28,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 16:23:28,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 16:23:28,344 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 16:23:28,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:28,344 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 16:23:28,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 16:23:28,345 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 16:23:28,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 16:23:28,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:28,345 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:28,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 16:23:28,346 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:28,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:28,346 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-18 16:23:28,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:28,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304592985] [2020-08-18 16:23:28,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:28,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:28,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:28,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:28,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:28,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:29,244 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:29,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304592985] [2020-08-18 16:23:29,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:29,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 16:23:29,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384880084] [2020-08-18 16:23:29,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 16:23:29,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:29,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 16:23:29,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:23:29,246 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 16:23:29,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:29,554 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 16:23:29,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 16:23:29,556 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 16:23:29,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:29,557 INFO L225 Difference]: With dead ends: 90 [2020-08-18 16:23:29,557 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 16:23:29,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 16:23:29,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 16:23:29,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 16:23:29,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 16:23:29,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 16:23:29,562 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 16:23:29,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:29,563 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 16:23:29,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 16:23:29,563 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 16:23:29,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 16:23:29,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:29,564 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:29,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 16:23:29,564 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:29,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:29,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-18 16:23:29,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:29,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053059843] [2020-08-18 16:23:29,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:29,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:29,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:29,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:29,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:29,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:30,419 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:30,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053059843] [2020-08-18 16:23:30,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:30,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 16:23:30,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127185807] [2020-08-18 16:23:30,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 16:23:30,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:30,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 16:23:30,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:23:30,430 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 16:23:30,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:30,683 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 16:23:30,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 16:23:30,684 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 16:23:30,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:30,685 INFO L225 Difference]: With dead ends: 92 [2020-08-18 16:23:30,685 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 16:23:30,686 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:23:30,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 16:23:30,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 16:23:30,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 16:23:30,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 16:23:30,691 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 16:23:30,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:30,691 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 16:23:30,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 16:23:30,691 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 16:23:30,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 16:23:30,692 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:30,692 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:30,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 16:23:30,692 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:30,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:30,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-18 16:23:30,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:30,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926400201] [2020-08-18 16:23:30,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:30,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:30,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:30,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:30,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:30,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:31,597 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:31,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1926400201] [2020-08-18 16:23:31,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:31,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 16:23:31,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802855309] [2020-08-18 16:23:31,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 16:23:31,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:31,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 16:23:31,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 16:23:31,598 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 16:23:31,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:31,916 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 16:23:31,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 16:23:31,916 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 16:23:31,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:31,917 INFO L225 Difference]: With dead ends: 94 [2020-08-18 16:23:31,918 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 16:23:31,919 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 16:23:31,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 16:23:31,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 16:23:31,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 16:23:31,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 16:23:31,924 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 16:23:31,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:31,924 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 16:23:31,924 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 16:23:31,924 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 16:23:31,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 16:23:31,925 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:31,925 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:31,926 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 16:23:31,926 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:31,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:31,926 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-18 16:23:31,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:31,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [300605178] [2020-08-18 16:23:31,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:31,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:31,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:31,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:31,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:32,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:32,927 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:32,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [300605178] [2020-08-18 16:23:32,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:32,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 16:23:32,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358867195] [2020-08-18 16:23:32,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 16:23:32,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:32,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 16:23:32,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 16:23:32,929 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 16:23:33,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:33,271 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 16:23:33,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 16:23:33,272 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 16:23:33,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:33,273 INFO L225 Difference]: With dead ends: 96 [2020-08-18 16:23:33,273 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 16:23:33,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-18 16:23:33,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 16:23:33,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 16:23:33,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 16:23:33,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 16:23:33,278 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 16:23:33,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:33,278 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 16:23:33,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 16:23:33,278 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 16:23:33,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 16:23:33,279 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:33,279 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:33,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 16:23:33,280 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:33,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:33,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-18 16:23:33,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:33,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1881654335] [2020-08-18 16:23:33,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:33,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:33,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:33,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:33,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:33,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:34,456 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:34,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1881654335] [2020-08-18 16:23:34,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:34,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 16:23:34,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533993471] [2020-08-18 16:23:34,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 16:23:34,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:34,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 16:23:34,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:23:34,459 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 16:23:34,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:34,648 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 16:23:34,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 16:23:34,648 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 16:23:34,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:34,649 INFO L225 Difference]: With dead ends: 98 [2020-08-18 16:23:34,649 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 16:23:34,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-18 16:23:34,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 16:23:34,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 16:23:34,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 16:23:34,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 16:23:34,655 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 16:23:34,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:34,656 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 16:23:34,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 16:23:34,656 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 16:23:34,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 16:23:34,657 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:34,657 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:34,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 16:23:34,657 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:34,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:34,657 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-18 16:23:34,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:34,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1699207300] [2020-08-18 16:23:34,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:34,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:34,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:34,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:34,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:34,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:35,794 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:35,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1699207300] [2020-08-18 16:23:35,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:35,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 16:23:35,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811155417] [2020-08-18 16:23:35,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 16:23:35,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:35,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 16:23:35,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 16:23:35,797 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 16:23:36,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:36,087 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 16:23:36,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 16:23:36,087 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 16:23:36,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:36,088 INFO L225 Difference]: With dead ends: 100 [2020-08-18 16:23:36,088 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 16:23:36,089 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-18 16:23:36,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 16:23:36,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 16:23:36,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 16:23:36,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 16:23:36,093 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 16:23:36,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:36,094 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 16:23:36,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 16:23:36,094 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 16:23:36,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 16:23:36,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:36,095 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:36,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 16:23:36,095 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:36,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:36,095 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-18 16:23:36,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:36,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813683847] [2020-08-18 16:23:36,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:36,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:36,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:36,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:36,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:36,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:37,265 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:37,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813683847] [2020-08-18 16:23:37,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:37,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 16:23:37,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497298691] [2020-08-18 16:23:37,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 16:23:37,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:37,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 16:23:37,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 16:23:37,267 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 16:23:37,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:37,624 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 16:23:37,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 16:23:37,625 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 16:23:37,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:37,626 INFO L225 Difference]: With dead ends: 102 [2020-08-18 16:23:37,626 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 16:23:37,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:23:37,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 16:23:37,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 16:23:37,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 16:23:37,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 16:23:37,632 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 16:23:37,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:37,632 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 16:23:37,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 16:23:37,632 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 16:23:37,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 16:23:37,633 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:37,633 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:37,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 16:23:37,633 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:37,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:37,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-18 16:23:37,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:37,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980086437] [2020-08-18 16:23:37,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:37,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:37,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:37,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:37,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:37,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:38,872 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:38,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980086437] [2020-08-18 16:23:38,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:38,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 16:23:38,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143789867] [2020-08-18 16:23:38,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 16:23:38,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:38,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 16:23:38,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 16:23:38,874 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 16:23:39,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:39,158 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 16:23:39,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 16:23:39,159 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 16:23:39,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:39,160 INFO L225 Difference]: With dead ends: 104 [2020-08-18 16:23:39,160 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 16:23:39,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 16:23:39,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 16:23:39,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 16:23:39,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 16:23:39,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 16:23:39,166 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 16:23:39,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:39,166 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 16:23:39,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 16:23:39,167 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 16:23:39,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 16:23:39,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:39,167 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:39,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 16:23:39,170 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:39,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:39,170 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-18 16:23:39,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:39,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [879454345] [2020-08-18 16:23:39,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:39,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:39,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:39,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:39,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:39,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:40,469 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:40,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [879454345] [2020-08-18 16:23:40,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:40,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 16:23:40,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201056193] [2020-08-18 16:23:40,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 16:23:40,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:40,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 16:23:40,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 16:23:40,471 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 16:23:40,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:40,855 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 16:23:40,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 16:23:40,855 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 16:23:40,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:40,856 INFO L225 Difference]: With dead ends: 106 [2020-08-18 16:23:40,856 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 16:23:40,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 16:23:40,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 16:23:40,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 16:23:40,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 16:23:40,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 16:23:40,863 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 16:23:40,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:40,863 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 16:23:40,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 16:23:40,863 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 16:23:40,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 16:23:40,864 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:40,864 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:40,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 16:23:40,864 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:40,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:40,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-18 16:23:40,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:40,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167651652] [2020-08-18 16:23:40,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:40,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:40,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:40,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:40,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:40,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:42,262 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:42,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167651652] [2020-08-18 16:23:42,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:42,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 16:23:42,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087026204] [2020-08-18 16:23:42,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 16:23:42,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:42,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 16:23:42,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:23:42,263 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 16:23:42,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:42,678 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 16:23:42,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 16:23:42,678 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 16:23:42,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:42,679 INFO L225 Difference]: With dead ends: 108 [2020-08-18 16:23:42,679 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 16:23:42,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 16:23:42,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 16:23:42,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 16:23:42,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 16:23:42,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 16:23:42,685 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 16:23:42,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:42,685 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 16:23:42,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 16:23:42,685 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 16:23:42,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 16:23:42,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:42,686 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:42,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 16:23:42,686 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:42,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:42,687 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-18 16:23:42,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:42,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1852610051] [2020-08-18 16:23:42,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:42,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:42,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:42,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:42,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:42,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:44,130 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:44,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1852610051] [2020-08-18 16:23:44,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:44,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 16:23:44,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828054917] [2020-08-18 16:23:44,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 16:23:44,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:44,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 16:23:44,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 16:23:44,132 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 16:23:44,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:44,539 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 16:23:44,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 16:23:44,539 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 16:23:44,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:44,540 INFO L225 Difference]: With dead ends: 110 [2020-08-18 16:23:44,540 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 16:23:44,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 16:23:44,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 16:23:44,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 16:23:44,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 16:23:44,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 16:23:44,547 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 16:23:44,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:44,548 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 16:23:44,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 16:23:44,548 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 16:23:44,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 16:23:44,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:44,549 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:44,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 16:23:44,549 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:44,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:44,549 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-18 16:23:44,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:44,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118667183] [2020-08-18 16:23:44,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:44,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:44,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:44,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:44,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:44,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:46,066 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:46,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118667183] [2020-08-18 16:23:46,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:46,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 16:23:46,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519307419] [2020-08-18 16:23:46,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 16:23:46,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:46,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 16:23:46,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 16:23:46,068 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 16:23:46,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:46,479 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 16:23:46,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 16:23:46,480 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 16:23:46,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:46,481 INFO L225 Difference]: With dead ends: 112 [2020-08-18 16:23:46,481 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 16:23:46,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 16:23:46,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 16:23:46,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 16:23:46,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 16:23:46,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 16:23:46,486 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 16:23:46,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:46,486 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 16:23:46,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 16:23:46,486 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 16:23:46,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 16:23:46,487 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:46,487 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:46,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 16:23:46,487 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:46,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:46,487 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-18 16:23:46,487 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:46,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [787554378] [2020-08-18 16:23:46,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:46,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:46,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:46,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:46,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:46,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:48,102 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:48,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [787554378] [2020-08-18 16:23:48,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:48,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 16:23:48,103 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571774416] [2020-08-18 16:23:48,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 16:23:48,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:48,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 16:23:48,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 16:23:48,104 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 16:23:48,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:48,549 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 16:23:48,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 16:23:48,550 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 16:23:48,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:48,551 INFO L225 Difference]: With dead ends: 114 [2020-08-18 16:23:48,551 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 16:23:48,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 16:23:48,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 16:23:48,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 16:23:48,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 16:23:48,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 16:23:48,562 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 16:23:48,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:48,563 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 16:23:48,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 16:23:48,563 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 16:23:48,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 16:23:48,563 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:48,564 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:48,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 16:23:48,566 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:48,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:48,567 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-18 16:23:48,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:48,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [469492307] [2020-08-18 16:23:48,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:48,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:48,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:48,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:48,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:48,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:50,291 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:50,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [469492307] [2020-08-18 16:23:50,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:50,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 16:23:50,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298485673] [2020-08-18 16:23:50,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 16:23:50,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:50,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 16:23:50,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 16:23:50,294 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 16:23:50,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:50,620 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 16:23:50,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 16:23:50,620 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 16:23:50,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:50,622 INFO L225 Difference]: With dead ends: 116 [2020-08-18 16:23:50,622 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 16:23:50,623 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 16:23:50,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 16:23:50,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 16:23:50,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 16:23:50,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 16:23:50,629 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 16:23:50,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:50,629 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 16:23:50,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 16:23:50,630 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 16:23:50,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 16:23:50,630 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:50,631 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:50,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 16:23:50,631 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:50,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:50,631 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-18 16:23:50,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:50,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792541052] [2020-08-18 16:23:50,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:50,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:50,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:50,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:50,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:50,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:52,384 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:52,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792541052] [2020-08-18 16:23:52,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:52,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 16:23:52,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653023504] [2020-08-18 16:23:52,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 16:23:52,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:52,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 16:23:52,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 16:23:52,386 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 16:23:52,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:52,840 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 16:23:52,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 16:23:52,840 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 16:23:52,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:52,841 INFO L225 Difference]: With dead ends: 118 [2020-08-18 16:23:52,842 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 16:23:52,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 16:23:52,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 16:23:52,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 16:23:52,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 16:23:52,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 16:23:52,848 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 16:23:52,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:52,848 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 16:23:52,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 16:23:52,848 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 16:23:52,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 16:23:52,849 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:52,849 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:52,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 16:23:52,849 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:52,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:52,850 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-18 16:23:52,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:52,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1632279648] [2020-08-18 16:23:52,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:52,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:52,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:52,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:52,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:52,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:54,713 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:54,714 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1632279648] [2020-08-18 16:23:54,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:54,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 16:23:54,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913908452] [2020-08-18 16:23:54,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 16:23:54,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:54,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 16:23:54,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 16:23:54,720 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 16:23:55,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:55,130 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 16:23:55,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 16:23:55,131 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 16:23:55,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:55,132 INFO L225 Difference]: With dead ends: 120 [2020-08-18 16:23:55,132 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 16:23:55,133 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 16:23:55,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 16:23:55,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 16:23:55,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 16:23:55,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 16:23:55,140 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 16:23:55,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:55,140 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 16:23:55,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 16:23:55,140 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 16:23:55,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 16:23:55,146 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:55,146 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:55,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 16:23:55,146 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:55,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:55,147 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-18 16:23:55,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:55,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [589324334] [2020-08-18 16:23:55,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:55,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:55,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:55,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:55,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:55,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:57,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:57,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [589324334] [2020-08-18 16:23:57,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:57,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 16:23:57,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128419035] [2020-08-18 16:23:57,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 16:23:57,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:57,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 16:23:57,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 16:23:57,054 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 16:23:57,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:57,363 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 16:23:57,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 16:23:57,364 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 16:23:57,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:57,365 INFO L225 Difference]: With dead ends: 122 [2020-08-18 16:23:57,365 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 16:23:57,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 16:23:57,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 16:23:57,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 16:23:57,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 16:23:57,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 16:23:57,371 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 16:23:57,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:57,371 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 16:23:57,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 16:23:57,371 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 16:23:57,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 16:23:57,372 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:57,372 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:57,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 16:23:57,372 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:57,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:57,372 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-18 16:23:57,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:57,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267008356] [2020-08-18 16:23:57,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:57,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:57,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:57,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:57,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:57,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:59,385 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:59,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267008356] [2020-08-18 16:23:59,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:59,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 16:23:59,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080739451] [2020-08-18 16:23:59,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 16:23:59,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:59,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 16:23:59,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 16:23:59,387 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 16:23:59,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:59,677 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 16:23:59,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 16:23:59,677 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 16:23:59,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:59,678 INFO L225 Difference]: With dead ends: 124 [2020-08-18 16:23:59,679 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 16:23:59,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 16:23:59,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 16:23:59,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 16:23:59,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 16:23:59,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 16:23:59,684 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 16:23:59,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:59,685 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 16:23:59,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 16:23:59,685 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 16:23:59,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 16:23:59,685 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:59,685 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:23:59,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 16:23:59,686 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:59,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:59,686 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-18 16:23:59,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:59,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [141095882] [2020-08-18 16:23:59,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:59,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:59,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:59,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:59,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:59,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:01,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:24:01,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [141095882] [2020-08-18 16:24:01,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:01,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 16:24:01,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287865150] [2020-08-18 16:24:01,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 16:24:01,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:01,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 16:24:01,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 16:24:01,833 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 16:24:02,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:02,164 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 16:24:02,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 16:24:02,165 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 16:24:02,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:02,166 INFO L225 Difference]: With dead ends: 126 [2020-08-18 16:24:02,166 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 16:24:02,168 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 16:24:02,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 16:24:02,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 16:24:02,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 16:24:02,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 16:24:02,173 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 16:24:02,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:02,173 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 16:24:02,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 16:24:02,173 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 16:24:02,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 16:24:02,174 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:02,174 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:02,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 16:24:02,174 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:02,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:02,175 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-18 16:24:02,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:02,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1979309543] [2020-08-18 16:24:02,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:02,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:02,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:02,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:02,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:24:02,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:04,465 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:24:04,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1979309543] [2020-08-18 16:24:04,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:04,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 16:24:04,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126522714] [2020-08-18 16:24:04,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 16:24:04,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:04,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 16:24:04,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 16:24:04,466 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 16:24:04,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:04,874 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 16:24:04,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 16:24:04,875 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 16:24:04,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:04,875 INFO L225 Difference]: With dead ends: 128 [2020-08-18 16:24:04,875 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 16:24:04,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 16:24:04,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 16:24:04,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 16:24:04,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 16:24:04,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 16:24:04,881 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 16:24:04,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:04,881 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 16:24:04,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 16:24:04,882 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 16:24:04,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 16:24:04,882 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:04,883 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:04,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 16:24:04,883 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:04,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:04,883 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-18 16:24:04,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:04,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788954141] [2020-08-18 16:24:04,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:04,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:04,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:04,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:04,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:24:04,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:07,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:24:07,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788954141] [2020-08-18 16:24:07,277 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:07,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 16:24:07,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727622914] [2020-08-18 16:24:07,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 16:24:07,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:07,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 16:24:07,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 16:24:07,279 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-18 16:24:07,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:07,845 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-18 16:24:07,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 16:24:07,846 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-18 16:24:07,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:07,847 INFO L225 Difference]: With dead ends: 130 [2020-08-18 16:24:07,847 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 16:24:07,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 16:24:07,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 16:24:07,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 16:24:07,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 16:24:07,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-18 16:24:07,851 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-18 16:24:07,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:07,851 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-18 16:24:07,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 16:24:07,851 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-18 16:24:07,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 16:24:07,852 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:07,852 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:07,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 16:24:07,852 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:07,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:07,852 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-18 16:24:07,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:07,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [349473938] [2020-08-18 16:24:07,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:07,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:07,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:07,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:07,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:24:07,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:10,333 INFO L134 CoverageAnalysis]: Checked inductivity of 1449 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:24:10,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [349473938] [2020-08-18 16:24:10,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:10,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 16:24:10,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351937504] [2020-08-18 16:24:10,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 16:24:10,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:10,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 16:24:10,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=1066, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 16:24:10,335 INFO L87 Difference]: Start difference. First operand 107 states and 110 transitions. Second operand 44 states. [2020-08-18 16:24:10,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:10,694 INFO L93 Difference]: Finished difference Result 132 states and 138 transitions. [2020-08-18 16:24:10,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 16:24:10,695 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 102 [2020-08-18 16:24:10,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:10,696 INFO L225 Difference]: With dead ends: 132 [2020-08-18 16:24:10,696 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 16:24:10,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=916, Invalid=1246, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 16:24:10,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 16:24:10,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-18 16:24:10,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 16:24:10,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 112 transitions. [2020-08-18 16:24:10,703 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 112 transitions. Word has length 102 [2020-08-18 16:24:10,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:10,704 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 112 transitions. [2020-08-18 16:24:10,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 16:24:10,704 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 112 transitions. [2020-08-18 16:24:10,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-18 16:24:10,705 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:10,705 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:10,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 16:24:10,705 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:10,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:10,706 INFO L82 PathProgramCache]: Analyzing trace with hash 1531761942, now seen corresponding path program 31 times [2020-08-18 16:24:10,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:10,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647357599] [2020-08-18 16:24:10,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:10,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:10,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:10,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:10,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:24:10,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:13,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1526 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:24:13,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647357599] [2020-08-18 16:24:13,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:13,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 16:24:13,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855258864] [2020-08-18 16:24:13,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 16:24:13,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:13,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 16:24:13,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=867, Invalid=1113, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 16:24:13,239 INFO L87 Difference]: Start difference. First operand 109 states and 112 transitions. Second operand 45 states. [2020-08-18 16:24:13,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:13,810 INFO L93 Difference]: Finished difference Result 134 states and 140 transitions. [2020-08-18 16:24:13,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 16:24:13,811 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 104 [2020-08-18 16:24:13,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:13,812 INFO L225 Difference]: With dead ends: 134 [2020-08-18 16:24:13,813 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 16:24:13,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=959, Invalid=1297, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 16:24:13,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 16:24:13,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-18 16:24:13,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-18 16:24:13,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2020-08-18 16:24:13,819 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 104 [2020-08-18 16:24:13,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:13,819 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2020-08-18 16:24:13,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 16:24:13,820 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2020-08-18 16:24:13,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-18 16:24:13,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:13,820 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 16:24:13,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 16:24:13,821 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:13,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:13,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1306196952, now seen corresponding path program 32 times [2020-08-18 16:24:13,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:13,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [130224554] [2020-08-18 16:24:13,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:13,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:13,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:13,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:13,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:24:13,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat