/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.1 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 03:09:06,033 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 03:09:06,036 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 03:09:06,079 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 03:09:06,080 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 03:09:06,088 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 03:09:06,091 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 03:09:06,094 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 03:09:06,097 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 03:09:06,100 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 03:09:06,101 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 03:09:06,102 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 03:09:06,102 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 03:09:06,105 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 03:09:06,107 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 03:09:06,109 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 03:09:06,111 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 03:09:06,112 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 03:09:06,113 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 03:09:06,122 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 03:09:06,124 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 03:09:06,125 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 03:09:06,126 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 03:09:06,127 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 03:09:06,139 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 03:09:06,140 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 03:09:06,140 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 03:09:06,148 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 03:09:06,149 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 03:09:06,150 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 03:09:06,150 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 03:09:06,151 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 03:09:06,155 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 03:09:06,156 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 03:09:06,157 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 03:09:06,157 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 03:09:06,158 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 03:09:06,158 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 03:09:06,158 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 03:09:06,159 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 03:09:06,160 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 03:09:06,160 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 [2020-08-22 03:09:06,199 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 03:09:06,200 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 03:09:06,202 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 03:09:06,202 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 03:09:06,202 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 03:09:06,202 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 03:09:06,203 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 03:09:06,203 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 03:09:06,203 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 03:09:06,203 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 03:09:06,204 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 03:09:06,205 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 03:09:06,205 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 03:09:06,205 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 03:09:06,205 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 03:09:06,206 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 03:09:06,206 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 03:09:06,206 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 03:09:06,206 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 03:09:06,206 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 03:09:06,207 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 03:09:06,207 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 03:09:06,207 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 03:09:06,207 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 03:09:06,207 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 03:09:06,208 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 03:09:06,208 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 03:09:06,208 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 03:09:06,208 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 03:09:06,208 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1;log-additional-information=true; [2020-08-22 03:09:06,539 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 03:09:06,551 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 03:09:06,554 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 03:09:06,556 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 03:09:06,556 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 03:09:06,557 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-22 03:09:06,620 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0a5d3d72d/fda20d21c7c642d995d67531894556eb/FLAGa1e0fd965 [2020-08-22 03:09:07,096 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 03:09:07,096 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-22 03:09:07,103 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0a5d3d72d/fda20d21c7c642d995d67531894556eb/FLAGa1e0fd965 [2020-08-22 03:09:07,436 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0a5d3d72d/fda20d21c7c642d995d67531894556eb [2020-08-22 03:09:07,444 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 03:09:07,445 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 03:09:07,446 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 03:09:07,446 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 03:09:07,450 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 03:09:07,451 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:09:07" (1/1) ... [2020-08-22 03:09:07,454 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71155234 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:07, skipping insertion in model container [2020-08-22 03:09:07,454 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 03:09:07" (1/1) ... [2020-08-22 03:09:07,462 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 03:09:07,480 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 03:09:07,664 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:09:07,671 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 03:09:07,691 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 03:09:07,707 INFO L208 MainTranslator]: Completed translation [2020-08-22 03:09:07,707 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:07 WrapperNode [2020-08-22 03:09:07,707 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 03:09:07,708 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 03:09:07,708 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 03:09:07,708 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 03:09:07,797 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:07" (1/1) ... [2020-08-22 03:09:07,797 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:07" (1/1) ... [2020-08-22 03:09:07,806 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:07" (1/1) ... [2020-08-22 03:09:07,806 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:07" (1/1) ... [2020-08-22 03:09:07,814 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:07" (1/1) ... [2020-08-22 03:09:07,820 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:07" (1/1) ... [2020-08-22 03:09:07,823 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:07" (1/1) ... [2020-08-22 03:09:07,825 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 03:09:07,825 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 03:09:07,826 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 03:09:07,826 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 03:09:07,827 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:07" (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 [2020-08-22 03:09:07,890 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 03:09:07,890 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 03:09:07,890 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 03:09:07,890 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-22 03:09:07,891 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 03:09:07,891 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 03:09:07,891 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 03:09:07,891 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-22 03:09:07,891 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-22 03:09:07,891 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-22 03:09:07,892 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-22 03:09:07,892 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-22 03:09:07,892 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 03:09:07,892 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 03:09:07,892 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-22 03:09:07,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 03:09:07,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 03:09:07,893 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 03:09:08,150 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 03:09:08,151 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 03:09:08,155 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:09:08 BoogieIcfgContainer [2020-08-22 03:09:08,155 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 03:09:08,156 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 03:09:08,156 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 03:09:08,159 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 03:09:08,159 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 03:09:07" (1/3) ... [2020-08-22 03:09:08,160 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18f2659a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:09:08, skipping insertion in model container [2020-08-22 03:09:08,161 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 03:09:07" (2/3) ... [2020-08-22 03:09:08,161 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18f2659a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 03:09:08, skipping insertion in model container [2020-08-22 03:09:08,161 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 03:09:08" (3/3) ... [2020-08-22 03:09:08,163 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-22 03:09:08,176 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 03:09:08,189 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 03:09:08,215 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 03:09:08,256 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 03:09:08,256 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 03:09:08,256 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 03:09:08,256 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 03:09:08,257 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 03:09:08,257 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 03:09:08,257 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 03:09:08,257 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 03:09:08,278 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-22 03:09:08,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 03:09:08,285 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:08,287 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] [2020-08-22 03:09:08,287 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:08,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:08,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-22 03:09:08,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:08,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1904907813] [2020-08-22 03:09:08,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:08,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:08,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:08,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:08,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:08,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:08,545 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:08,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1904907813] [2020-08-22 03:09:08,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:09:08,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 03:09:08,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195822146] [2020-08-22 03:09:08,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 03:09:08,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:08,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 03:09:08,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 03:09:08,570 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-22 03:09:08,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:08,741 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-22 03:09:08,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 03:09:08,743 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-22 03:09:08,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:08,754 INFO L225 Difference]: With dead ends: 59 [2020-08-22 03:09:08,755 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 03:09:08,759 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 [2020-08-22 03:09:08,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 03:09:08,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-22 03:09:08,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 03:09:08,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-22 03:09:08,805 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-22 03:09:08,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:08,806 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-22 03:09:08,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 03:09:08,807 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-22 03:09:08,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 03:09:08,808 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:08,808 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] [2020-08-22 03:09:08,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 03:09:08,809 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:08,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:08,810 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-22 03:09:08,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:08,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1446786568] [2020-08-22 03:09:08,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:08,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:08,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:08,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:08,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:08,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:09,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:09,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1446786568] [2020-08-22 03:09:09,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:09:09,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-22 03:09:09,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907737659] [2020-08-22 03:09:09,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 03:09:09,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:09,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 03:09:09,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-22 03:09:09,029 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-22 03:09:09,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:09,317 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-22 03:09:09,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 03:09:09,318 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-22 03:09:09,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:09,319 INFO L225 Difference]: With dead ends: 48 [2020-08-22 03:09:09,319 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 03:09:09,320 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-22 03:09:09,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 03:09:09,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-22 03:09:09,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 03:09:09,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-22 03:09:09,329 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-22 03:09:09,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:09,330 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-22 03:09:09,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 03:09:09,331 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-22 03:09:09,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 03:09:09,332 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:09,332 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] [2020-08-22 03:09:09,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 03:09:09,333 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:09,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:09,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-22 03:09:09,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:09,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359293016] [2020-08-22 03:09:09,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:09,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:09,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:09,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:09,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:09,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:09,524 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:09,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359293016] [2020-08-22 03:09:09,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:09,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 03:09:09,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247739983] [2020-08-22 03:09:09,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 03:09:09,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:09,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 03:09:09,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-22 03:09:09,527 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-22 03:09:09,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:09,692 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-22 03:09:09,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 03:09:09,693 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-22 03:09:09,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:09,694 INFO L225 Difference]: With dead ends: 50 [2020-08-22 03:09:09,694 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 03:09:09,695 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 [2020-08-22 03:09:09,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 03:09:09,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-22 03:09:09,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-22 03:09:09,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-22 03:09:09,702 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-22 03:09:09,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:09,703 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-22 03:09:09,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 03:09:09,703 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-22 03:09:09,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 03:09:09,704 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:09,704 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] [2020-08-22 03:09:09,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 03:09:09,705 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:09,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:09,705 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-22 03:09:09,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:09,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [965642645] [2020-08-22 03:09:09,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:09,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:09,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:09,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:09,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:09,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:09,926 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:09,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [965642645] [2020-08-22 03:09:09,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:09,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 03:09:09,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79073526] [2020-08-22 03:09:09,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 03:09:09,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:09,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 03:09:09,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-22 03:09:09,929 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-22 03:09:10,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:10,116 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-22 03:09:10,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 03:09:10,117 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-22 03:09:10,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:10,118 INFO L225 Difference]: With dead ends: 52 [2020-08-22 03:09:10,118 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 03:09:10,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-22 03:09:10,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 03:09:10,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-22 03:09:10,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 03:09:10,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-22 03:09:10,126 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-22 03:09:10,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:10,126 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-22 03:09:10,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 03:09:10,126 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-22 03:09:10,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-22 03:09:10,127 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:10,127 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] [2020-08-22 03:09:10,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 03:09:10,128 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:10,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:10,128 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-22 03:09:10,129 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:10,129 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [394299064] [2020-08-22 03:09:10,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:10,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:10,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:10,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:10,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:10,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:10,411 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:10,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [394299064] [2020-08-22 03:09:10,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:10,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 03:09:10,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094641922] [2020-08-22 03:09:10,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 03:09:10,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:10,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 03:09:10,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-22 03:09:10,414 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-22 03:09:10,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:10,641 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-22 03:09:10,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 03:09:10,641 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-22 03:09:10,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:10,642 INFO L225 Difference]: With dead ends: 54 [2020-08-22 03:09:10,642 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 03:09:10,643 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 [2020-08-22 03:09:10,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 03:09:10,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-22 03:09:10,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 03:09:10,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-22 03:09:10,649 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-22 03:09:10,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:10,650 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-22 03:09:10,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 03:09:10,650 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-22 03:09:10,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 03:09:10,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:10,651 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] [2020-08-22 03:09:10,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 03:09:10,652 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:10,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:10,652 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-22 03:09:10,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:10,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [805062394] [2020-08-22 03:09:10,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:10,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:10,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:10,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:10,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:10,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:10,891 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:10,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [805062394] [2020-08-22 03:09:10,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:10,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 03:09:10,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116170937] [2020-08-22 03:09:10,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 03:09:10,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:10,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 03:09:10,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-22 03:09:10,894 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-22 03:09:11,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:11,087 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-22 03:09:11,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 03:09:11,088 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-22 03:09:11,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:11,089 INFO L225 Difference]: With dead ends: 56 [2020-08-22 03:09:11,089 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 03:09:11,091 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 [2020-08-22 03:09:11,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 03:09:11,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-22 03:09:11,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 03:09:11,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-22 03:09:11,104 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-22 03:09:11,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:11,106 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-22 03:09:11,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 03:09:11,107 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-22 03:09:11,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-22 03:09:11,109 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:11,110 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] [2020-08-22 03:09:11,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 03:09:11,110 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:11,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:11,111 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-22 03:09:11,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:11,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903663289] [2020-08-22 03:09:11,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:11,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:11,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:11,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:11,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:11,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:11,486 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:11,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903663289] [2020-08-22 03:09:11,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:11,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 03:09:11,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465869298] [2020-08-22 03:09:11,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 03:09:11,488 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:11,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 03:09:11,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-22 03:09:11,488 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-22 03:09:11,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:11,722 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-22 03:09:11,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 03:09:11,723 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-22 03:09:11,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:11,724 INFO L225 Difference]: With dead ends: 58 [2020-08-22 03:09:11,725 INFO L226 Difference]: Without dead ends: 40 [2020-08-22 03:09:11,726 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-22 03:09:11,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-22 03:09:11,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-22 03:09:11,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 03:09:11,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-22 03:09:11,732 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-22 03:09:11,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:11,732 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-22 03:09:11,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 03:09:11,733 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-22 03:09:11,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 03:09:11,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:11,734 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] [2020-08-22 03:09:11,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 03:09:11,734 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:11,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:11,735 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-22 03:09:11,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:11,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1809813647] [2020-08-22 03:09:11,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:11,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:11,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:11,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:11,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:11,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:12,047 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:12,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1809813647] [2020-08-22 03:09:12,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:12,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 03:09:12,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860781408] [2020-08-22 03:09:12,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 03:09:12,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:12,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 03:09:12,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-22 03:09:12,049 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-22 03:09:12,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:12,264 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-22 03:09:12,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 03:09:12,265 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-22 03:09:12,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:12,266 INFO L225 Difference]: With dead ends: 60 [2020-08-22 03:09:12,266 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 03:09:12,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-22 03:09:12,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 03:09:12,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-22 03:09:12,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 03:09:12,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-22 03:09:12,277 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-22 03:09:12,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:12,278 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-22 03:09:12,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 03:09:12,278 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-22 03:09:12,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 03:09:12,279 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:12,279 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] [2020-08-22 03:09:12,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 03:09:12,280 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:12,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:12,280 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-22 03:09:12,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:12,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721847160] [2020-08-22 03:09:12,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:12,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:12,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:12,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:12,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:12,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:12,639 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:12,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721847160] [2020-08-22 03:09:12,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:12,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 03:09:12,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856713619] [2020-08-22 03:09:12,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 03:09:12,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:12,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 03:09:12,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-22 03:09:12,649 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-22 03:09:12,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:12,842 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-22 03:09:12,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 03:09:12,843 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-22 03:09:12,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:12,845 INFO L225 Difference]: With dead ends: 62 [2020-08-22 03:09:12,846 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 03:09:12,847 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 [2020-08-22 03:09:12,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 03:09:12,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-22 03:09:12,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-22 03:09:12,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-22 03:09:12,857 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-22 03:09:12,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:12,857 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-22 03:09:12,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 03:09:12,858 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-22 03:09:12,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 03:09:12,863 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:12,863 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] [2020-08-22 03:09:12,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 03:09:12,863 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:12,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:12,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-22 03:09:12,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:12,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709135801] [2020-08-22 03:09:12,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:12,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:12,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:12,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:12,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:12,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:13,318 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 03:09:13,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709135801] [2020-08-22 03:09:13,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:13,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 03:09:13,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130180907] [2020-08-22 03:09:13,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 03:09:13,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:13,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 03:09:13,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-22 03:09:13,321 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-22 03:09:13,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:13,575 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-22 03:09:13,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 03:09:13,576 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-22 03:09:13,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:13,577 INFO L225 Difference]: With dead ends: 64 [2020-08-22 03:09:13,577 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 03:09:13,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-22 03:09:13,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 03:09:13,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-22 03:09:13,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-22 03:09:13,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-22 03:09:13,583 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-22 03:09:13,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:13,584 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-22 03:09:13,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 03:09:13,584 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-22 03:09:13,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 03:09:13,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:13,585 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] [2020-08-22 03:09:13,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 03:09:13,586 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:13,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:13,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-22 03:09:13,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:13,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2122058454] [2020-08-22 03:09:13,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:13,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:13,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:13,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:13,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:13,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:13,648 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-22 03:09:13,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2122058454] [2020-08-22 03:09:13,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:09:13,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 03:09:13,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605038493] [2020-08-22 03:09:13,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 03:09:13,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:13,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 03:09:13,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 03:09:13,650 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-22 03:09:13,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:13,730 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-22 03:09:13,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 03:09:13,731 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-22 03:09:13,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:13,733 INFO L225 Difference]: With dead ends: 65 [2020-08-22 03:09:13,733 INFO L226 Difference]: Without dead ends: 53 [2020-08-22 03:09:13,733 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 [2020-08-22 03:09:13,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-22 03:09:13,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-22 03:09:13,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 03:09:13,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-22 03:09:13,743 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-22 03:09:13,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:13,744 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-22 03:09:13,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 03:09:13,744 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-22 03:09:13,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 03:09:13,745 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:13,745 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] [2020-08-22 03:09:13,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 03:09:13,745 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:13,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:13,746 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-22 03:09:13,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:13,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [400923029] [2020-08-22 03:09:13,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:13,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:13,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:13,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:13,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:13,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:13,812 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-22 03:09:13,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [400923029] [2020-08-22 03:09:13,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:13,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 03:09:13,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132046968] [2020-08-22 03:09:13,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 03:09:13,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:13,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 03:09:13,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 03:09:13,815 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-22 03:09:13,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:13,915 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-22 03:09:13,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 03:09:13,915 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-22 03:09:13,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:13,917 INFO L225 Difference]: With dead ends: 73 [2020-08-22 03:09:13,917 INFO L226 Difference]: Without dead ends: 61 [2020-08-22 03:09:13,917 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 [2020-08-22 03:09:13,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-22 03:09:13,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-22 03:09:13,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 03:09:13,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-22 03:09:13,924 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-22 03:09:13,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:13,925 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-22 03:09:13,925 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 03:09:13,925 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-22 03:09:13,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 03:09:13,926 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:13,926 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] [2020-08-22 03:09:13,926 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 03:09:13,926 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:13,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:13,927 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-22 03:09:13,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:13,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545137328] [2020-08-22 03:09:13,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:13,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:13,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:13,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:13,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:13,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:14,003 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-22 03:09:14,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545137328] [2020-08-22 03:09:14,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 03:09:14,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 03:09:14,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607512966] [2020-08-22 03:09:14,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 03:09:14,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:14,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 03:09:14,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 03:09:14,006 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-22 03:09:14,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:14,090 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-22 03:09:14,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 03:09:14,091 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-22 03:09:14,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:14,092 INFO L225 Difference]: With dead ends: 69 [2020-08-22 03:09:14,092 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 03:09:14,093 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 [2020-08-22 03:09:14,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 03:09:14,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-22 03:09:14,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 03:09:14,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-22 03:09:14,099 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-22 03:09:14,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:14,099 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-22 03:09:14,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 03:09:14,100 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-22 03:09:14,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 03:09:14,101 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:14,101 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] [2020-08-22 03:09:14,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 03:09:14,101 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:14,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:14,102 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-22 03:09:14,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:14,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [845972938] [2020-08-22 03:09:14,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:14,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:14,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:14,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:14,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:14,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:14,579 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:14,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [845972938] [2020-08-22 03:09:14,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:14,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 03:09:14,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043852080] [2020-08-22 03:09:14,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 03:09:14,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:14,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 03:09:14,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-22 03:09:14,583 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-22 03:09:14,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:14,787 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-22 03:09:14,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 03:09:14,788 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-22 03:09:14,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:14,789 INFO L225 Difference]: With dead ends: 74 [2020-08-22 03:09:14,789 INFO L226 Difference]: Without dead ends: 52 [2020-08-22 03:09:14,789 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 [2020-08-22 03:09:14,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-22 03:09:14,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-22 03:09:14,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-22 03:09:14,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-22 03:09:14,796 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-22 03:09:14,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:14,796 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-22 03:09:14,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 03:09:14,796 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-22 03:09:14,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-22 03:09:14,797 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:14,797 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] [2020-08-22 03:09:14,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 03:09:14,798 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:14,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:14,798 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-22 03:09:14,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:14,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1379479436] [2020-08-22 03:09:14,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:14,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:14,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:14,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:14,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:14,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:15,262 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:15,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1379479436] [2020-08-22 03:09:15,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:15,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 03:09:15,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303732917] [2020-08-22 03:09:15,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 03:09:15,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:15,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 03:09:15,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-22 03:09:15,266 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-22 03:09:15,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:15,491 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-22 03:09:15,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 03:09:15,491 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-22 03:09:15,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:15,492 INFO L225 Difference]: With dead ends: 76 [2020-08-22 03:09:15,492 INFO L226 Difference]: Without dead ends: 54 [2020-08-22 03:09:15,493 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 [2020-08-22 03:09:15,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-22 03:09:15,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-22 03:09:15,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-22 03:09:15,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-22 03:09:15,514 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-22 03:09:15,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:15,514 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-22 03:09:15,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 03:09:15,515 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-22 03:09:15,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-22 03:09:15,516 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:15,516 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] [2020-08-22 03:09:15,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 03:09:15,516 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:15,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:15,516 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-22 03:09:15,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:15,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480476640] [2020-08-22 03:09:15,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:15,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:15,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:15,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:15,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:15,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:16,022 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:16,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480476640] [2020-08-22 03:09:16,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:16,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 03:09:16,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966534271] [2020-08-22 03:09:16,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 03:09:16,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:16,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 03:09:16,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-22 03:09:16,024 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-22 03:09:16,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:16,272 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-22 03:09:16,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 03:09:16,273 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-22 03:09:16,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:16,273 INFO L225 Difference]: With dead ends: 78 [2020-08-22 03:09:16,273 INFO L226 Difference]: Without dead ends: 56 [2020-08-22 03:09:16,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-22 03:09:16,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-22 03:09:16,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-22 03:09:16,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-22 03:09:16,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-22 03:09:16,282 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-22 03:09:16,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:16,282 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-22 03:09:16,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 03:09:16,282 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-22 03:09:16,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-22 03:09:16,290 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:16,291 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] [2020-08-22 03:09:16,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 03:09:16,291 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:16,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:16,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-22 03:09:16,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:16,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [26724797] [2020-08-22 03:09:16,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:16,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:16,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:16,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:16,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:16,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:16,874 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:16,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [26724797] [2020-08-22 03:09:16,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:16,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 03:09:16,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711998124] [2020-08-22 03:09:16,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 03:09:16,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:16,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 03:09:16,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-22 03:09:16,877 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-22 03:09:17,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:17,124 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-22 03:09:17,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 03:09:17,125 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-22 03:09:17,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:17,126 INFO L225 Difference]: With dead ends: 80 [2020-08-22 03:09:17,126 INFO L226 Difference]: Without dead ends: 58 [2020-08-22 03:09:17,127 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 [2020-08-22 03:09:17,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-22 03:09:17,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-22 03:09:17,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-22 03:09:17,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-22 03:09:17,132 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-22 03:09:17,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:17,132 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-22 03:09:17,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 03:09:17,132 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-22 03:09:17,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-22 03:09:17,133 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:17,133 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] [2020-08-22 03:09:17,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 03:09:17,133 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:17,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:17,133 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-22 03:09:17,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:17,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [329205701] [2020-08-22 03:09:17,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:17,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:17,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:17,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:17,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:17,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:17,759 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:17,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [329205701] [2020-08-22 03:09:17,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:17,760 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 03:09:17,760 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109753318] [2020-08-22 03:09:17,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 03:09:17,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:17,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 03:09:17,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-22 03:09:17,762 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-22 03:09:18,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:18,068 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-22 03:09:18,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 03:09:18,068 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-22 03:09:18,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:18,069 INFO L225 Difference]: With dead ends: 82 [2020-08-22 03:09:18,069 INFO L226 Difference]: Without dead ends: 60 [2020-08-22 03:09:18,070 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-22 03:09:18,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-22 03:09:18,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-22 03:09:18,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-22 03:09:18,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-22 03:09:18,074 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-22 03:09:18,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:18,074 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-22 03:09:18,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 03:09:18,074 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-22 03:09:18,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-22 03:09:18,075 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:18,075 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] [2020-08-22 03:09:18,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 03:09:18,076 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:18,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:18,076 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-22 03:09:18,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:18,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [841546431] [2020-08-22 03:09:18,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:18,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:18,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:18,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:18,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:18,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:18,733 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:18,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [841546431] [2020-08-22 03:09:18,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:18,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 03:09:18,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446027871] [2020-08-22 03:09:18,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 03:09:18,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:18,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 03:09:18,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-22 03:09:18,735 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-22 03:09:19,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:19,040 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-22 03:09:19,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 03:09:19,041 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-22 03:09:19,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:19,042 INFO L225 Difference]: With dead ends: 84 [2020-08-22 03:09:19,042 INFO L226 Difference]: Without dead ends: 62 [2020-08-22 03:09:19,043 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 [2020-08-22 03:09:19,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-22 03:09:19,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-22 03:09:19,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-22 03:09:19,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-22 03:09:19,049 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-22 03:09:19,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:19,050 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-22 03:09:19,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 03:09:19,050 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-22 03:09:19,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-22 03:09:19,051 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:19,051 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] [2020-08-22 03:09:19,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 03:09:19,051 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:19,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:19,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-22 03:09:19,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:19,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [916144582] [2020-08-22 03:09:19,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:19,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:19,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:19,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:19,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:19,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:19,824 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:19,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [916144582] [2020-08-22 03:09:19,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:19,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 03:09:19,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352440362] [2020-08-22 03:09:19,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 03:09:19,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:19,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 03:09:19,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-22 03:09:19,829 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-22 03:09:20,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:20,053 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-22 03:09:20,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 03:09:20,054 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-22 03:09:20,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:20,055 INFO L225 Difference]: With dead ends: 86 [2020-08-22 03:09:20,055 INFO L226 Difference]: Without dead ends: 64 [2020-08-22 03:09:20,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-22 03:09:20,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-22 03:09:20,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-22 03:09:20,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-22 03:09:20,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-22 03:09:20,065 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-22 03:09:20,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:20,066 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-22 03:09:20,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 03:09:20,066 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-22 03:09:20,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-22 03:09:20,067 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:20,067 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] [2020-08-22 03:09:20,067 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 03:09:20,067 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:20,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:20,068 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-22 03:09:20,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:20,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876796148] [2020-08-22 03:09:20,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:20,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:20,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:20,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:20,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:20,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:21,114 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:21,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876796148] [2020-08-22 03:09:21,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:21,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 03:09:21,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210422628] [2020-08-22 03:09:21,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 03:09:21,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:21,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 03:09:21,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-22 03:09:21,120 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-22 03:09:21,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:21,499 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-22 03:09:21,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 03:09:21,500 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-22 03:09:21,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:21,501 INFO L225 Difference]: With dead ends: 88 [2020-08-22 03:09:21,501 INFO L226 Difference]: Without dead ends: 66 [2020-08-22 03:09:21,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-22 03:09:21,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-22 03:09:21,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-22 03:09:21,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-22 03:09:21,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-22 03:09:21,509 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-22 03:09:21,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:21,510 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-22 03:09:21,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 03:09:21,510 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-22 03:09:21,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-22 03:09:21,511 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:21,511 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] [2020-08-22 03:09:21,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 03:09:21,512 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:21,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:21,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-22 03:09:21,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:21,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1078154351] [2020-08-22 03:09:21,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:21,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:21,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:21,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:21,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:21,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:22,423 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:22,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1078154351] [2020-08-22 03:09:22,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:22,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 03:09:22,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249899519] [2020-08-22 03:09:22,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 03:09:22,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:22,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 03:09:22,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-22 03:09:22,425 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-22 03:09:22,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:22,742 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-22 03:09:22,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 03:09:22,745 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-22 03:09:22,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:22,745 INFO L225 Difference]: With dead ends: 90 [2020-08-22 03:09:22,745 INFO L226 Difference]: Without dead ends: 68 [2020-08-22 03:09:22,746 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 [2020-08-22 03:09:22,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-22 03:09:22,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-22 03:09:22,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-22 03:09:22,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-22 03:09:22,750 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-22 03:09:22,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:22,751 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-22 03:09:22,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 03:09:22,751 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-22 03:09:22,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-22 03:09:22,752 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:22,752 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] [2020-08-22 03:09:22,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 03:09:22,752 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:22,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:22,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-22 03:09:22,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:22,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686223307] [2020-08-22 03:09:22,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:22,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:22,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:22,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:22,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:22,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:23,645 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:23,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686223307] [2020-08-22 03:09:23,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:23,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 03:09:23,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373446117] [2020-08-22 03:09:23,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 03:09:23,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:23,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 03:09:23,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-22 03:09:23,647 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-22 03:09:23,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:23,958 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-22 03:09:23,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 03:09:23,959 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-22 03:09:23,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:23,960 INFO L225 Difference]: With dead ends: 92 [2020-08-22 03:09:23,960 INFO L226 Difference]: Without dead ends: 70 [2020-08-22 03:09:23,961 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 [2020-08-22 03:09:23,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-22 03:09:23,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-22 03:09:23,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-22 03:09:23,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-22 03:09:23,966 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-22 03:09:23,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:23,967 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-22 03:09:23,967 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 03:09:23,967 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-22 03:09:23,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-22 03:09:23,968 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:23,968 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] [2020-08-22 03:09:23,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 03:09:23,968 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:23,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:23,969 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-22 03:09:23,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:23,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052280483] [2020-08-22 03:09:23,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:23,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:24,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:24,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:24,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:24,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:25,006 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:25,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052280483] [2020-08-22 03:09:25,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:25,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 03:09:25,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250953207] [2020-08-22 03:09:25,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 03:09:25,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:25,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 03:09:25,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-22 03:09:25,011 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-22 03:09:25,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:25,359 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-22 03:09:25,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 03:09:25,359 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-22 03:09:25,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:25,361 INFO L225 Difference]: With dead ends: 94 [2020-08-22 03:09:25,361 INFO L226 Difference]: Without dead ends: 72 [2020-08-22 03:09:25,362 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-22 03:09:25,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-22 03:09:25,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-22 03:09:25,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-22 03:09:25,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-22 03:09:25,367 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-22 03:09:25,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:25,368 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-22 03:09:25,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 03:09:25,368 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-22 03:09:25,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-22 03:09:25,369 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:25,369 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] [2020-08-22 03:09:25,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 03:09:25,370 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:25,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:25,370 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-22 03:09:25,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:25,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928294907] [2020-08-22 03:09:25,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:25,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:25,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:25,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:25,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:25,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:26,406 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:26,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928294907] [2020-08-22 03:09:26,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:26,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 03:09:26,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438097153] [2020-08-22 03:09:26,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 03:09:26,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:26,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 03:09:26,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-22 03:09:26,408 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-22 03:09:26,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:26,762 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-22 03:09:26,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 03:09:26,763 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-22 03:09:26,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:26,764 INFO L225 Difference]: With dead ends: 96 [2020-08-22 03:09:26,764 INFO L226 Difference]: Without dead ends: 74 [2020-08-22 03:09:26,765 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-22 03:09:26,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-22 03:09:26,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-22 03:09:26,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-22 03:09:26,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-22 03:09:26,769 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-22 03:09:26,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:26,769 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-22 03:09:26,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 03:09:26,769 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-22 03:09:26,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-22 03:09:26,770 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:26,770 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] [2020-08-22 03:09:26,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 03:09:26,770 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:26,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:26,771 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-22 03:09:26,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:26,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1467352220] [2020-08-22 03:09:26,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:26,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:26,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:26,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:26,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:26,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:27,905 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:27,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1467352220] [2020-08-22 03:09:27,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:27,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 03:09:27,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18747105] [2020-08-22 03:09:27,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 03:09:27,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:27,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 03:09:27,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-22 03:09:27,907 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-22 03:09:28,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:28,146 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-22 03:09:28,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 03:09:28,146 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-22 03:09:28,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:28,147 INFO L225 Difference]: With dead ends: 98 [2020-08-22 03:09:28,147 INFO L226 Difference]: Without dead ends: 76 [2020-08-22 03:09:28,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-22 03:09:28,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-22 03:09:28,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-22 03:09:28,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-22 03:09:28,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-22 03:09:28,152 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-22 03:09:28,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:28,152 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-22 03:09:28,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 03:09:28,153 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-22 03:09:28,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-22 03:09:28,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:28,154 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] [2020-08-22 03:09:28,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 03:09:28,154 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:28,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:28,154 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-22 03:09:28,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:28,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [363710653] [2020-08-22 03:09:28,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:28,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:28,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:28,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:28,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:28,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:29,398 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:29,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [363710653] [2020-08-22 03:09:29,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:29,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 03:09:29,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310914684] [2020-08-22 03:09:29,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 03:09:29,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:29,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 03:09:29,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-22 03:09:29,400 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-22 03:09:29,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:29,755 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-22 03:09:29,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 03:09:29,756 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-22 03:09:29,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:29,757 INFO L225 Difference]: With dead ends: 100 [2020-08-22 03:09:29,757 INFO L226 Difference]: Without dead ends: 78 [2020-08-22 03:09:29,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-22 03:09:29,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-22 03:09:29,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-22 03:09:29,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-22 03:09:29,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-22 03:09:29,763 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-22 03:09:29,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:29,763 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-22 03:09:29,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 03:09:29,763 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-22 03:09:29,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-22 03:09:29,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:29,764 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] [2020-08-22 03:09:29,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 03:09:29,765 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:29,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:29,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-22 03:09:29,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:29,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1860003961] [2020-08-22 03:09:29,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:29,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:29,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:29,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:29,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:29,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:31,213 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:31,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1860003961] [2020-08-22 03:09:31,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:31,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 03:09:31,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856105221] [2020-08-22 03:09:31,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 03:09:31,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:31,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 03:09:31,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-22 03:09:31,215 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-22 03:09:31,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:31,632 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-22 03:09:31,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-22 03:09:31,633 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-22 03:09:31,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:31,634 INFO L225 Difference]: With dead ends: 102 [2020-08-22 03:09:31,634 INFO L226 Difference]: Without dead ends: 80 [2020-08-22 03:09:31,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-22 03:09:31,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-22 03:09:31,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-22 03:09:31,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-22 03:09:31,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-22 03:09:31,639 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-22 03:09:31,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:31,639 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-22 03:09:31,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 03:09:31,639 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-22 03:09:31,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-22 03:09:31,640 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:31,640 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] [2020-08-22 03:09:31,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 03:09:31,641 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:31,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:31,641 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-22 03:09:31,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:31,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [719975731] [2020-08-22 03:09:31,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:31,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:31,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:31,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:31,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:31,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:32,975 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:32,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [719975731] [2020-08-22 03:09:32,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:32,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 03:09:32,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757283057] [2020-08-22 03:09:32,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 03:09:32,976 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:32,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 03:09:32,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-22 03:09:32,977 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-22 03:09:33,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:33,257 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-22 03:09:33,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 03:09:33,257 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-22 03:09:33,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:33,258 INFO L225 Difference]: With dead ends: 104 [2020-08-22 03:09:33,258 INFO L226 Difference]: Without dead ends: 82 [2020-08-22 03:09:33,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 03:09:33,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-22 03:09:33,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-22 03:09:33,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-22 03:09:33,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-22 03:09:33,263 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-22 03:09:33,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:33,263 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-22 03:09:33,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 03:09:33,264 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-22 03:09:33,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-22 03:09:33,264 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:33,265 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] [2020-08-22 03:09:33,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 03:09:33,265 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:33,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:33,265 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-22 03:09:33,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:33,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951044306] [2020-08-22 03:09:33,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:33,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:33,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:33,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:33,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:33,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:34,634 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:34,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951044306] [2020-08-22 03:09:34,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:34,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 03:09:34,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153636802] [2020-08-22 03:09:34,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 03:09:34,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:34,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 03:09:34,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-22 03:09:34,637 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-22 03:09:35,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:35,072 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-22 03:09:35,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-22 03:09:35,073 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-22 03:09:35,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:35,074 INFO L225 Difference]: With dead ends: 106 [2020-08-22 03:09:35,074 INFO L226 Difference]: Without dead ends: 84 [2020-08-22 03:09:35,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 03:09:35,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-22 03:09:35,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-22 03:09:35,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-22 03:09:35,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-22 03:09:35,080 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-22 03:09:35,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:35,080 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-22 03:09:35,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 03:09:35,081 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-22 03:09:35,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-22 03:09:35,081 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:35,081 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] [2020-08-22 03:09:35,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 03:09:35,082 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:35,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:35,082 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-22 03:09:35,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:35,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1969749020] [2020-08-22 03:09:35,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:35,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:35,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:35,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:35,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:35,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:36,619 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:36,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1969749020] [2020-08-22 03:09:36,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:36,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 03:09:36,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123352927] [2020-08-22 03:09:36,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 03:09:36,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:36,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 03:09:36,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-22 03:09:36,621 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-22 03:09:37,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:37,053 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-22 03:09:37,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 03:09:37,053 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-22 03:09:37,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:37,055 INFO L225 Difference]: With dead ends: 108 [2020-08-22 03:09:37,055 INFO L226 Difference]: Without dead ends: 86 [2020-08-22 03:09:37,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 03:09:37,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-22 03:09:37,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-22 03:09:37,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-22 03:09:37,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-22 03:09:37,060 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-22 03:09:37,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:37,061 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-22 03:09:37,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 03:09:37,061 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-22 03:09:37,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-22 03:09:37,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:37,062 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] [2020-08-22 03:09:37,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 03:09:37,062 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:37,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:37,062 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-22 03:09:37,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:37,063 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069244485] [2020-08-22 03:09:37,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:37,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:37,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:37,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:37,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:37,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:38,799 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:38,800 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069244485] [2020-08-22 03:09:38,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:38,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 03:09:38,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137290647] [2020-08-22 03:09:38,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 03:09:38,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:38,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 03:09:38,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 03:09:38,804 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-22 03:09:39,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:39,240 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-22 03:09:39,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-22 03:09:39,241 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-22 03:09:39,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:39,242 INFO L225 Difference]: With dead ends: 110 [2020-08-22 03:09:39,242 INFO L226 Difference]: Without dead ends: 88 [2020-08-22 03:09:39,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 03:09:39,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-22 03:09:39,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-22 03:09:39,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-22 03:09:39,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-22 03:09:39,248 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-22 03:09:39,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:39,249 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-22 03:09:39,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 03:09:39,249 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-22 03:09:39,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-22 03:09:39,250 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:39,250 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] [2020-08-22 03:09:39,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 03:09:39,250 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:39,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:39,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-22 03:09:39,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:39,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276453950] [2020-08-22 03:09:39,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:39,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:39,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:39,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:39,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:39,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:40,966 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:40,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1276453950] [2020-08-22 03:09:40,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:40,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-22 03:09:40,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317187156] [2020-08-22 03:09:40,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-22 03:09:40,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:40,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-22 03:09:40,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 03:09:40,969 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-22 03:09:41,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:41,426 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-22 03:09:41,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 03:09:41,431 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-22 03:09:41,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:41,432 INFO L225 Difference]: With dead ends: 112 [2020-08-22 03:09:41,433 INFO L226 Difference]: Without dead ends: 90 [2020-08-22 03:09:41,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 03:09:41,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-22 03:09:41,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-22 03:09:41,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-22 03:09:41,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-22 03:09:41,438 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-22 03:09:41,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:41,438 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-22 03:09:41,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-22 03:09:41,439 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-22 03:09:41,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-22 03:09:41,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:41,439 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] [2020-08-22 03:09:41,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 03:09:41,440 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:41,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:41,440 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-22 03:09:41,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:41,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [146744552] [2020-08-22 03:09:41,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:41,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:41,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:41,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:41,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:41,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,202 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:43,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [146744552] [2020-08-22 03:09:43,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:43,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 03:09:43,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538821519] [2020-08-22 03:09:43,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 03:09:43,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:43,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 03:09:43,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 03:09:43,205 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-22 03:09:43,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:43,698 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-22 03:09:43,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 03:09:43,698 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-22 03:09:43,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:43,699 INFO L225 Difference]: With dead ends: 114 [2020-08-22 03:09:43,699 INFO L226 Difference]: Without dead ends: 92 [2020-08-22 03:09:43,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 03:09:43,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-22 03:09:43,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-22 03:09:43,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-22 03:09:43,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-22 03:09:43,707 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-22 03:09:43,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:43,710 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-22 03:09:43,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 03:09:43,710 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-22 03:09:43,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-22 03:09:43,711 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:43,711 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] [2020-08-22 03:09:43,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 03:09:43,711 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:43,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:43,712 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-22 03:09:43,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:43,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275856488] [2020-08-22 03:09:43,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:43,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:43,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:43,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:43,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:45,584 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:45,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275856488] [2020-08-22 03:09:45,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:45,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 03:09:45,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064812399] [2020-08-22 03:09:45,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 03:09:45,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:45,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 03:09:45,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 03:09:45,587 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-22 03:09:45,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:45,941 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-22 03:09:45,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 03:09:45,942 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-22 03:09:45,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:45,943 INFO L225 Difference]: With dead ends: 116 [2020-08-22 03:09:45,944 INFO L226 Difference]: Without dead ends: 94 [2020-08-22 03:09:45,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 03:09:45,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-22 03:09:45,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-22 03:09:45,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-22 03:09:45,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-22 03:09:45,950 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-22 03:09:45,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:45,951 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-22 03:09:45,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 03:09:45,951 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-22 03:09:45,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-22 03:09:45,952 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:45,952 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] [2020-08-22 03:09:45,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 03:09:45,952 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:45,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:45,953 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-22 03:09:45,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:45,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686292167] [2020-08-22 03:09:45,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:45,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:46,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:46,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:46,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:46,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:47,847 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:47,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686292167] [2020-08-22 03:09:47,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:47,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 03:09:47,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56390096] [2020-08-22 03:09:47,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 03:09:47,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:47,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 03:09:47,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 03:09:47,849 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-22 03:09:48,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:48,332 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-22 03:09:48,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 03:09:48,333 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-22 03:09:48,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:48,334 INFO L225 Difference]: With dead ends: 118 [2020-08-22 03:09:48,334 INFO L226 Difference]: Without dead ends: 96 [2020-08-22 03:09:48,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 03:09:48,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-22 03:09:48,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-22 03:09:48,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-22 03:09:48,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-22 03:09:48,345 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-22 03:09:48,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:48,345 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-22 03:09:48,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 03:09:48,346 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-22 03:09:48,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-22 03:09:48,346 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:48,346 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] [2020-08-22 03:09:48,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 03:09:48,347 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:48,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:48,347 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-22 03:09:48,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:48,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1332918072] [2020-08-22 03:09:48,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:48,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:48,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:48,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:48,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:48,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:50,335 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:50,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1332918072] [2020-08-22 03:09:50,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:50,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-22 03:09:50,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285627919] [2020-08-22 03:09:50,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-22 03:09:50,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:50,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-22 03:09:50,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 03:09:50,338 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-22 03:09:50,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:50,778 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-22 03:09:50,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 03:09:50,779 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-22 03:09:50,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:50,780 INFO L225 Difference]: With dead ends: 120 [2020-08-22 03:09:50,780 INFO L226 Difference]: Without dead ends: 98 [2020-08-22 03:09:50,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 03:09:50,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-22 03:09:50,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-22 03:09:50,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-22 03:09:50,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-22 03:09:50,788 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-22 03:09:50,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:50,788 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-22 03:09:50,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-22 03:09:50,788 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-22 03:09:50,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-22 03:09:50,789 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:50,789 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] [2020-08-22 03:09:50,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 03:09:50,789 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:50,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:50,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-22 03:09:50,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:50,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055679886] [2020-08-22 03:09:50,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:50,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:50,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:50,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:50,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:50,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:52,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:52,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055679886] [2020-08-22 03:09:52,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:52,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 03:09:52,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924979270] [2020-08-22 03:09:52,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 03:09:52,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:52,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 03:09:52,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 03:09:52,928 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-22 03:09:53,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:53,288 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-22 03:09:53,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-22 03:09:53,289 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-22 03:09:53,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:53,290 INFO L225 Difference]: With dead ends: 122 [2020-08-22 03:09:53,290 INFO L226 Difference]: Without dead ends: 100 [2020-08-22 03:09:53,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 03:09:53,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-22 03:09:53,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-22 03:09:53,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-22 03:09:53,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-22 03:09:53,296 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-22 03:09:53,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:53,296 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-22 03:09:53,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 03:09:53,296 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-22 03:09:53,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-22 03:09:53,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:53,297 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] [2020-08-22 03:09:53,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 03:09:53,297 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:53,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:53,298 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-22 03:09:53,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:53,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [186395526] [2020-08-22 03:09:53,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:53,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:53,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:53,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:53,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:53,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:55,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:55,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [186395526] [2020-08-22 03:09:55,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:55,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 03:09:55,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198560913] [2020-08-22 03:09:55,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 03:09:55,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:55,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 03:09:55,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 03:09:55,663 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-22 03:09:55,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:55,990 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-22 03:09:55,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 03:09:55,991 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-22 03:09:55,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:55,992 INFO L225 Difference]: With dead ends: 124 [2020-08-22 03:09:55,992 INFO L226 Difference]: Without dead ends: 102 [2020-08-22 03:09:55,993 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 03:09:55,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-22 03:09:55,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-22 03:09:55,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-22 03:09:55,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-22 03:09:55,999 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-22 03:09:56,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:56,000 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-22 03:09:56,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 03:09:56,000 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-22 03:09:56,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-22 03:09:56,001 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:56,001 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] [2020-08-22 03:09:56,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 03:09:56,002 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:56,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:56,002 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-22 03:09:56,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:56,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1065615488] [2020-08-22 03:09:56,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:56,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:56,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:56,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:56,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:56,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:58,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:09:58,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1065615488] [2020-08-22 03:09:58,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:09:58,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 03:09:58,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776100553] [2020-08-22 03:09:58,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 03:09:58,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:09:58,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 03:09:58,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 03:09:58,327 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-22 03:09:58,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:09:58,717 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-22 03:09:58,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-22 03:09:58,717 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-22 03:09:58,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:09:58,719 INFO L225 Difference]: With dead ends: 126 [2020-08-22 03:09:58,719 INFO L226 Difference]: Without dead ends: 104 [2020-08-22 03:09:58,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 03:09:58,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-22 03:09:58,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-22 03:09:58,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-22 03:09:58,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-22 03:09:58,723 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-22 03:09:58,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:09:58,724 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-22 03:09:58,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-22 03:09:58,724 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-22 03:09:58,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-22 03:09:58,724 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:09:58,724 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] [2020-08-22 03:09:58,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 03:09:58,725 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:09:58,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:09:58,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-22 03:09:58,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:09:58,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [151243481] [2020-08-22 03:09:58,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:09:58,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:58,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:09:58,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:09:58,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:09:58,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:01,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 03:10:01,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [151243481] [2020-08-22 03:10:01,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 03:10:01,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-22 03:10:01,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239291007] [2020-08-22 03:10:01,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-22 03:10:01,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 03:10:01,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-22 03:10:01,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 03:10:01,233 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-22 03:10:01,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 03:10:01,688 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-22 03:10:01,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-22 03:10:01,688 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-22 03:10:01,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 03:10:01,689 INFO L225 Difference]: With dead ends: 128 [2020-08-22 03:10:01,689 INFO L226 Difference]: Without dead ends: 106 [2020-08-22 03:10:01,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 03:10:01,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-22 03:10:01,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-22 03:10:01,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-22 03:10:01,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-22 03:10:01,697 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-22 03:10:01,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 03:10:01,698 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-22 03:10:01,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-22 03:10:01,698 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-22 03:10:01,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-22 03:10:01,699 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 03:10:01,699 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] [2020-08-22 03:10:01,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-22 03:10:01,699 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 03:10:01,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 03:10:01,700 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-22 03:10:01,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 03:10:01,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627390744] [2020-08-22 03:10:01,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 03:10:01,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:01,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 03:10:01,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 03:10:01,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-22 03:10:01,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat