/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.4 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 23:55:59,127 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 23:55:59,130 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 23:55:59,157 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 23:55:59,158 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 23:55:59,159 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 23:55:59,160 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 23:55:59,162 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 23:55:59,164 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 23:55:59,165 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 23:55:59,166 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 23:55:59,167 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 23:55:59,167 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 23:55:59,168 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 23:55:59,169 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 23:55:59,170 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 23:55:59,171 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 23:55:59,172 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 23:55:59,174 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 23:55:59,176 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 23:55:59,177 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 23:55:59,178 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 23:55:59,179 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 23:55:59,180 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 23:55:59,183 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 23:55:59,183 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 23:55:59,183 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 23:55:59,184 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 23:55:59,185 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 23:55:59,185 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 23:55:59,186 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 23:55:59,186 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 23:55:59,187 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 23:55:59,188 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 23:55:59,189 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 23:55:59,189 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 23:55:59,190 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 23:55:59,190 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 23:55:59,190 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 23:55:59,191 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 23:55:59,192 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 23:55:59,193 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 [2020-08-21 23:55:59,215 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 23:55:59,215 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 23:55:59,217 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 23:55:59,217 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 23:55:59,217 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 23:55:59,217 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 23:55:59,217 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 23:55:59,221 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 23:55:59,221 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 23:55:59,221 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 23:55:59,221 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 23:55:59,222 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 23:55:59,222 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 23:55:59,222 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 23:55:59,222 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 23:55:59,222 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 23:55:59,222 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 23:55:59,225 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 23:55:59,225 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 23:55:59,225 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 23:55:59,226 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 23:55:59,226 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 23:55:59,226 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 23:55:59,226 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 23:55:59,226 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 23:55:59,227 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 23:55:59,227 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 23:55:59,227 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 23:55:59,227 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 23:55:59,227 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=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; [2020-08-21 23:55:59,528 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 23:55:59,539 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 23:55:59,543 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 23:55:59,544 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 23:55:59,545 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 23:55:59,546 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c [2020-08-21 23:55:59,623 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2c4d729a5/97d9ae64384c45fe9e85103dca0c2645/FLAG72bbd9ed9 [2020-08-21 23:56:00,128 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 23:56:00,129 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c [2020-08-21 23:56:00,138 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2c4d729a5/97d9ae64384c45fe9e85103dca0c2645/FLAG72bbd9ed9 [2020-08-21 23:56:00,469 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2c4d729a5/97d9ae64384c45fe9e85103dca0c2645 [2020-08-21 23:56:00,480 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 23:56:00,481 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 23:56:00,482 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 23:56:00,482 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 23:56:00,486 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 23:56:00,487 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:56:00" (1/1) ... [2020-08-21 23:56:00,490 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5cf7e795 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:56:00, skipping insertion in model container [2020-08-21 23:56:00,490 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:56:00" (1/1) ... [2020-08-21 23:56:00,498 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 23:56:00,526 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 23:56:00,782 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:56:00,880 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 23:56:00,957 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:56:00,973 INFO L208 MainTranslator]: Completed translation [2020-08-21 23:56:00,973 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:56:00 WrapperNode [2020-08-21 23:56:00,974 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 23:56:00,974 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 23:56:00,974 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 23:56:00,974 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 23:56:00,986 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:56:00" (1/1) ... [2020-08-21 23:56:00,986 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:56:00" (1/1) ... [2020-08-21 23:56:01,004 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:56:00" (1/1) ... [2020-08-21 23:56:01,005 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:56:00" (1/1) ... [2020-08-21 23:56:01,037 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:56:00" (1/1) ... [2020-08-21 23:56:01,042 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:56:00" (1/1) ... [2020-08-21 23:56:01,047 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:56:00" (1/1) ... [2020-08-21 23:56:01,055 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 23:56:01,056 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 23:56:01,056 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 23:56:01,056 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 23:56:01,057 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:56:00" (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 [2020-08-21 23:56:01,135 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 23:56:01,135 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 23:56:01,135 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 23:56:01,136 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 23:56:01,136 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_89 [2020-08-21 23:56:01,136 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2020-08-21 23:56:01,136 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 23:56:01,137 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 23:56:01,137 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 23:56:01,138 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 23:56:01,138 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 23:56:01,139 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-08-21 23:56:01,139 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 23:56:01,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 23:56:01,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 23:56:01,140 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 23:56:01,140 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 23:56:03,962 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 23:56:03,962 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 23:56:03,974 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:56:03 BoogieIcfgContainer [2020-08-21 23:56:03,974 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 23:56:03,976 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 23:56:03,976 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 23:56:03,981 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 23:56:03,981 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 11:56:00" (1/3) ... [2020-08-21 23:56:03,983 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1869a55e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:56:03, skipping insertion in model container [2020-08-21 23:56:03,983 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:56:00" (2/3) ... [2020-08-21 23:56:03,985 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1869a55e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:56:03, skipping insertion in model container [2020-08-21 23:56:03,985 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:56:03" (3/3) ... [2020-08-21 23:56:03,989 INFO L109 eAbstractionObserver]: Analyzing ICFG aiob_4.c.v+cfa-reducer.c [2020-08-21 23:56:04,000 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 23:56:04,009 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 23:56:04,023 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 23:56:04,054 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 23:56:04,054 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 23:56:04,054 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 23:56:04,054 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 23:56:04,055 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 23:56:04,055 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 23:56:04,055 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 23:56:04,055 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 23:56:04,071 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-21 23:56:04,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 23:56:04,078 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:56:04,079 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:56:04,079 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:56:04,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:56:04,085 INFO L82 PathProgramCache]: Analyzing trace with hash 316900320, now seen corresponding path program 1 times [2020-08-21 23:56:04,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:56:04,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709669474] [2020-08-21 23:56:04,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:56:04,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:04,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:56:04,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:04,559 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:56:04,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709669474] [2020-08-21 23:56:04,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:56:04,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 23:56:04,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682483146] [2020-08-21 23:56:04,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:56:04,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:56:04,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:56:04,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:56:04,594 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 5 states. [2020-08-21 23:56:06,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:56:06,822 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2020-08-21 23:56:06,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 23:56:06,824 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 23:56:06,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:56:06,845 INFO L225 Difference]: With dead ends: 46 [2020-08-21 23:56:06,845 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 23:56:06,850 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:56:06,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 23:56:06,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 18. [2020-08-21 23:56:06,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 23:56:06,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 23:56:06,898 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-21 23:56:06,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:56:06,898 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 23:56:06,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:56:06,898 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 23:56:06,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 23:56:06,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:56:06,899 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:56:06,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 23:56:06,900 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:56:06,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:56:06,900 INFO L82 PathProgramCache]: Analyzing trace with hash 316483246, now seen corresponding path program 1 times [2020-08-21 23:56:06,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:56:06,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1867850717] [2020-08-21 23:56:06,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:56:06,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:07,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:56:07,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:07,027 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:56:07,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1867850717] [2020-08-21 23:56:07,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:56:07,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 23:56:07,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972261520] [2020-08-21 23:56:07,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:56:07,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:56:07,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:56:07,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:56:07,032 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states. [2020-08-21 23:56:09,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:56:09,162 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2020-08-21 23:56:09,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 23:56:09,163 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 23:56:09,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:56:09,164 INFO L225 Difference]: With dead ends: 28 [2020-08-21 23:56:09,164 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 23:56:09,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:56:09,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 23:56:09,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2020-08-21 23:56:09,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 23:56:09,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-21 23:56:09,176 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 13 [2020-08-21 23:56:09,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:56:09,178 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-21 23:56:09,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:56:09,179 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-21 23:56:09,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 23:56:09,180 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:56:09,182 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:56:09,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 23:56:09,185 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:56:09,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:56:09,186 INFO L82 PathProgramCache]: Analyzing trace with hash 625969832, now seen corresponding path program 1 times [2020-08-21 23:56:09,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:56:09,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762659858] [2020-08-21 23:56:09,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:56:09,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:09,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:56:09,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:09,403 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:56:09,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762659858] [2020-08-21 23:56:09,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:56:09,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 23:56:09,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576986104] [2020-08-21 23:56:09,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 23:56:09,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:56:09,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 23:56:09,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:56:09,406 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 6 states. [2020-08-21 23:56:13,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:56:13,637 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2020-08-21 23:56:13,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 23:56:13,639 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 23:56:13,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:56:13,640 INFO L225 Difference]: With dead ends: 40 [2020-08-21 23:56:13,640 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 23:56:13,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:56:13,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 23:56:13,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 26. [2020-08-21 23:56:13,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 23:56:13,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2020-08-21 23:56:13,660 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 19 [2020-08-21 23:56:13,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:56:13,661 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2020-08-21 23:56:13,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 23:56:13,661 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2020-08-21 23:56:13,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 23:56:13,663 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:56:13,663 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:56:13,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 23:56:13,664 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:56:13,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:56:13,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1878874992, now seen corresponding path program 2 times [2020-08-21 23:56:13,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:56:13,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705422390] [2020-08-21 23:56:13,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:56:13,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:13,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:56:13,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:13,865 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:56:13,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705422390] [2020-08-21 23:56:13,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:56:13,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 23:56:13,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660312493] [2020-08-21 23:56:13,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 23:56:13,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:56:13,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 23:56:13,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:56:13,868 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 7 states. [2020-08-21 23:56:20,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:56:20,135 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2020-08-21 23:56:20,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 23:56:20,136 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-21 23:56:20,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:56:20,137 INFO L225 Difference]: With dead ends: 46 [2020-08-21 23:56:20,137 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 23:56:20,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:56:20,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 23:56:20,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2020-08-21 23:56:20,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 23:56:20,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2020-08-21 23:56:20,153 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 25 [2020-08-21 23:56:20,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:56:20,154 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2020-08-21 23:56:20,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 23:56:20,154 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2020-08-21 23:56:20,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 23:56:20,158 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:56:20,158 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:56:20,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 23:56:20,158 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:56:20,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:56:20,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1460832712, now seen corresponding path program 3 times [2020-08-21 23:56:20,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:56:20,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254996972] [2020-08-21 23:56:20,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:56:20,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:20,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:56:20,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:20,424 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:56:20,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254996972] [2020-08-21 23:56:20,424 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:56:20,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 23:56:20,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073550619] [2020-08-21 23:56:20,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 23:56:20,425 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:56:20,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 23:56:20,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-21 23:56:20,428 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 8 states. [2020-08-21 23:56:28,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:56:28,727 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2020-08-21 23:56:28,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 23:56:28,728 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-21 23:56:28,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:56:28,729 INFO L225 Difference]: With dead ends: 52 [2020-08-21 23:56:28,729 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 23:56:28,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 23:56:28,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 23:56:28,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 38. [2020-08-21 23:56:28,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 23:56:28,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2020-08-21 23:56:28,740 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 31 [2020-08-21 23:56:28,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:56:28,741 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2020-08-21 23:56:28,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 23:56:28,741 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2020-08-21 23:56:28,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 23:56:28,742 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:56:28,743 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:56:28,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 23:56:28,743 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:56:28,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:56:28,743 INFO L82 PathProgramCache]: Analyzing trace with hash 599808768, now seen corresponding path program 4 times [2020-08-21 23:56:28,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:56:28,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1651041316] [2020-08-21 23:56:28,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:56:28,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:28,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:56:28,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:29,006 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:56:29,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1651041316] [2020-08-21 23:56:29,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:56:29,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 23:56:29,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423714752] [2020-08-21 23:56:29,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 23:56:29,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:56:29,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 23:56:29,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:56:29,009 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 9 states. [2020-08-21 23:56:39,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:56:39,417 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2020-08-21 23:56:39,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 23:56:39,418 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2020-08-21 23:56:39,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:56:39,419 INFO L225 Difference]: With dead ends: 58 [2020-08-21 23:56:39,419 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 23:56:39,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 23:56:39,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 23:56:39,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44. [2020-08-21 23:56:39,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 23:56:39,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2020-08-21 23:56:39,427 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 37 [2020-08-21 23:56:39,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:56:39,428 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2020-08-21 23:56:39,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 23:56:39,428 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2020-08-21 23:56:39,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 23:56:39,430 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:56:39,431 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:56:39,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 23:56:39,431 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:56:39,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:56:39,432 INFO L82 PathProgramCache]: Analyzing trace with hash 431393224, now seen corresponding path program 5 times [2020-08-21 23:56:39,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:56:39,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307899261] [2020-08-21 23:56:39,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:56:39,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:39,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:56:39,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:39,696 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 10 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:56:39,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307899261] [2020-08-21 23:56:39,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:56:39,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 23:56:39,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753985565] [2020-08-21 23:56:39,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 23:56:39,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:56:39,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 23:56:39,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 23:56:39,700 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand 10 states. [2020-08-21 23:56:52,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:56:52,127 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2020-08-21 23:56:52,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 23:56:52,127 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2020-08-21 23:56:52,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:56:52,128 INFO L225 Difference]: With dead ends: 64 [2020-08-21 23:56:52,129 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 23:56:52,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 23:56:52,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 23:56:52,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2020-08-21 23:56:52,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 23:56:52,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2020-08-21 23:56:52,138 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 43 [2020-08-21 23:56:52,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:56:52,139 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2020-08-21 23:56:52,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 23:56:52,139 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2020-08-21 23:56:52,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 23:56:52,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:56:52,140 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:56:52,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 23:56:52,141 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:56:52,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:56:52,141 INFO L82 PathProgramCache]: Analyzing trace with hash -240090480, now seen corresponding path program 6 times [2020-08-21 23:56:52,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:56:52,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006626505] [2020-08-21 23:56:52,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:56:52,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:52,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:56:52,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:56:52,352 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 12 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:56:52,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006626505] [2020-08-21 23:56:52,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:56:52,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 23:56:52,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328994860] [2020-08-21 23:56:52,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 23:56:52,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:56:52,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 23:56:52,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:56:52,355 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 11 states. [2020-08-21 23:57:06,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:57:06,907 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2020-08-21 23:57:06,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 23:57:06,913 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-08-21 23:57:06,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:57:06,914 INFO L225 Difference]: With dead ends: 70 [2020-08-21 23:57:06,915 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 23:57:06,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 23:57:06,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 23:57:06,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2020-08-21 23:57:06,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 23:57:06,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2020-08-21 23:57:06,929 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 49 [2020-08-21 23:57:06,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:57:06,929 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2020-08-21 23:57:06,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 23:57:06,929 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2020-08-21 23:57:06,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 23:57:06,931 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:57:06,931 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:57:06,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 23:57:06,932 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:57:06,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:57:06,933 INFO L82 PathProgramCache]: Analyzing trace with hash -2010200744, now seen corresponding path program 7 times [2020-08-21 23:57:06,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:57:06,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1202733805] [2020-08-21 23:57:06,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:57:06,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:57:07,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:57:07,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:57:07,203 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:57:07,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1202733805] [2020-08-21 23:57:07,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:57:07,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 23:57:07,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517705283] [2020-08-21 23:57:07,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 23:57:07,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:57:07,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 23:57:07,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-21 23:57:07,206 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand 12 states.