/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 12:18:16,103 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 12:18:16,106 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 12:18:16,130 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 12:18:16,130 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 12:18:16,131 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 12:18:16,132 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 12:18:16,134 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 12:18:16,136 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 12:18:16,137 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 12:18:16,138 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 12:18:16,139 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 12:18:16,139 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 12:18:16,140 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 12:18:16,141 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 12:18:16,142 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 12:18:16,143 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 12:18:16,144 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 12:18:16,145 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 12:18:16,147 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 12:18:16,148 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 12:18:16,149 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 12:18:16,150 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 12:18:16,151 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 12:18:16,153 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 12:18:16,153 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 12:18:16,154 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 12:18:16,154 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 12:18:16,155 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 12:18:16,156 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 12:18:16,156 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 12:18:16,157 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 12:18:16,157 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 12:18:16,158 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 12:18:16,159 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 12:18:16,159 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 12:18:16,160 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 12:18:16,160 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 12:18:16,160 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 12:18:16,161 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 12:18:16,162 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 12:18:16,163 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 12:18:16,186 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 12:18:16,186 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 12:18:16,187 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 12:18:16,187 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 12:18:16,188 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 12:18:16,188 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 12:18:16,188 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 12:18:16,188 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 12:18:16,188 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 12:18:16,189 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 12:18:16,189 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 12:18:16,189 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 12:18:16,189 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 12:18:16,189 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 12:18:16,190 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 12:18:16,190 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 12:18:16,190 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 12:18:16,190 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 12:18:16,190 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 12:18:16,191 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 12:18:16,191 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 12:18:16,191 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 12:18:16,191 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 12:18:16,191 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 12:18:16,192 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 12:18:16,192 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 12:18:16,192 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 12:18:16,192 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 12:18:16,192 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 12:18:16,193 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; [2020-08-18 12:18:16,481 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 12:18:16,495 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 12:18:16,505 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 12:18:16,507 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 12:18:16,507 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 12:18:16,508 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-18 12:18:16,568 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/79e56d933/df432f548a284eae9c33dd625e7f2924/FLAG51088070e [2020-08-18 12:18:17,203 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 12:18:17,204 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-18 12:18:17,233 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/79e56d933/df432f548a284eae9c33dd625e7f2924/FLAG51088070e [2020-08-18 12:18:17,323 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/79e56d933/df432f548a284eae9c33dd625e7f2924 [2020-08-18 12:18:17,331 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 12:18:17,333 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 12:18:17,334 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 12:18:17,335 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 12:18:17,338 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 12:18:17,339 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 12:18:17" (1/1) ... [2020-08-18 12:18:17,342 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6aea0440 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:17, skipping insertion in model container [2020-08-18 12:18:17,342 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 12:18:17" (1/1) ... [2020-08-18 12:18:17,350 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 12:18:17,543 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 12:18:19,124 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 12:18:19,138 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 12:18:20,189 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 12:18:20,225 INFO L208 MainTranslator]: Completed translation [2020-08-18 12:18:20,226 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:20 WrapperNode [2020-08-18 12:18:20,226 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 12:18:20,227 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 12:18:20,227 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 12:18:20,227 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 12:18:20,242 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:20" (1/1) ... [2020-08-18 12:18:20,244 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:20" (1/1) ... [2020-08-18 12:18:20,316 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:20" (1/1) ... [2020-08-18 12:18:20,317 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:20" (1/1) ... [2020-08-18 12:18:20,407 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:20" (1/1) ... [2020-08-18 12:18:20,459 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:20" (1/1) ... [2020-08-18 12:18:20,471 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:20" (1/1) ... [2020-08-18 12:18:20,487 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 12:18:20,488 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 12:18:20,488 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 12:18:20,488 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 12:18:20,490 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:20" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 12:18:20,576 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 12:18:20,577 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 12:18:20,577 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 12:18:20,578 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 12:18:20,579 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 12:18:20,579 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-18 12:18:20,579 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-18 12:18:20,580 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2020-08-18 12:18:20,580 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 12:18:20,581 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 12:18:20,582 INFO L130 BoogieDeclarations]: Found specification of procedure read [2020-08-18 12:18:20,583 INFO L130 BoogieDeclarations]: Found specification of procedure write [2020-08-18 12:18:20,583 INFO L130 BoogieDeclarations]: Found specification of procedure node1 [2020-08-18 12:18:20,583 INFO L130 BoogieDeclarations]: Found specification of procedure node2 [2020-08-18 12:18:20,583 INFO L130 BoogieDeclarations]: Found specification of procedure node3 [2020-08-18 12:18:20,585 INFO L130 BoogieDeclarations]: Found specification of procedure node4 [2020-08-18 12:18:20,585 INFO L130 BoogieDeclarations]: Found specification of procedure node5 [2020-08-18 12:18:20,585 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 12:18:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 12:18:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 12:18:20,586 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 12:18:20,587 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 12:18:24,581 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 12:18:24,581 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 12:18:24,597 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 12:18:24 BoogieIcfgContainer [2020-08-18 12:18:24,597 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 12:18:24,600 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 12:18:24,600 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 12:18:24,603 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 12:18:24,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 12:18:17" (1/3) ... [2020-08-18 12:18:24,604 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19e16968 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 12:18:24, skipping insertion in model container [2020-08-18 12:18:24,605 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:18:20" (2/3) ... [2020-08-18 12:18:24,605 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19e16968 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 12:18:24, skipping insertion in model container [2020-08-18 12:18:24,606 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 12:18:24" (3/3) ... [2020-08-18 12:18:24,607 INFO L109 eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c [2020-08-18 12:18:24,618 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 12:18:24,626 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-08-18 12:18:24,641 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-08-18 12:18:24,670 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 12:18:24,670 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 12:18:24,671 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 12:18:24,671 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 12:18:24,671 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 12:18:24,671 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 12:18:24,671 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 12:18:24,671 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 12:18:24,711 INFO L276 IsEmpty]: Start isEmpty. Operand 1371 states. [2020-08-18 12:18:24,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 465 [2020-08-18 12:18:24,769 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:18:24,772 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:18:24,772 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:18:24,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:18:24,779 INFO L82 PathProgramCache]: Analyzing trace with hash -856462850, now seen corresponding path program 1 times [2020-08-18 12:18:24,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:18:24,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1742886363] [2020-08-18 12:18:24,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:18:27,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:18:28,831 WARN L193 SmtUtils]: Spent 964.00 ms on a formula simplification that was a NOOP. DAG size: 391 [2020-08-18 12:18:28,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:18:28,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:18:29,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 12:18:29,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1742886363] [2020-08-18 12:18:29,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 12:18:29,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 12:18:29,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522313789] [2020-08-18 12:18:29,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 12:18:29,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:18:29,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 12:18:29,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 12:18:29,792 INFO L87 Difference]: Start difference. First operand 1371 states. Second operand 5 states. [2020-08-18 12:18:46,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:18:46,309 INFO L93 Difference]: Finished difference Result 4059 states and 7350 transitions. [2020-08-18 12:18:46,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 12:18:46,311 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 464 [2020-08-18 12:18:46,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:18:46,350 INFO L225 Difference]: With dead ends: 4059 [2020-08-18 12:18:46,351 INFO L226 Difference]: Without dead ends: 2697 [2020-08-18 12:18:46,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 12:18:46,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2697 states. [2020-08-18 12:18:46,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2697 to 2647. [2020-08-18 12:18:46,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2647 states. [2020-08-18 12:18:46,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2647 states to 2647 states and 4347 transitions. [2020-08-18 12:18:46,561 INFO L78 Accepts]: Start accepts. Automaton has 2647 states and 4347 transitions. Word has length 464 [2020-08-18 12:18:46,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:18:46,563 INFO L479 AbstractCegarLoop]: Abstraction has 2647 states and 4347 transitions. [2020-08-18 12:18:46,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 12:18:46,564 INFO L276 IsEmpty]: Start isEmpty. Operand 2647 states and 4347 transitions. [2020-08-18 12:18:46,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 467 [2020-08-18 12:18:46,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:18:46,580 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:18:46,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 12:18:46,581 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:18:46,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:18:46,581 INFO L82 PathProgramCache]: Analyzing trace with hash -1286826198, now seen corresponding path program 1 times [2020-08-18 12:18:46,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:18:46,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116772541] [2020-08-18 12:18:46,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:18:46,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:18:48,136 WARN L193 SmtUtils]: Spent 930.00 ms on a formula simplification that was a NOOP. DAG size: 391 [2020-08-18 12:18:48,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:18:48,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:18:48,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 12:18:48,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116772541] [2020-08-18 12:18:48,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 12:18:48,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 12:18:48,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690586735] [2020-08-18 12:18:48,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 12:18:48,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:18:48,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 12:18:48,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 12:18:48,707 INFO L87 Difference]: Start difference. First operand 2647 states and 4347 transitions. Second operand 4 states. [2020-08-18 12:19:05,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 12:19:05,906 INFO L93 Difference]: Finished difference Result 7670 states and 12560 transitions. [2020-08-18 12:19:05,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 12:19:05,908 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 466 [2020-08-18 12:19:05,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 12:19:05,935 INFO L225 Difference]: With dead ends: 7670 [2020-08-18 12:19:05,935 INFO L226 Difference]: Without dead ends: 5237 [2020-08-18 12:19:05,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 12:19:05,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5237 states. [2020-08-18 12:19:06,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5237 to 5189. [2020-08-18 12:19:06,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5189 states. [2020-08-18 12:19:06,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5189 states to 5189 states and 8497 transitions. [2020-08-18 12:19:06,137 INFO L78 Accepts]: Start accepts. Automaton has 5189 states and 8497 transitions. Word has length 466 [2020-08-18 12:19:06,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 12:19:06,139 INFO L479 AbstractCegarLoop]: Abstraction has 5189 states and 8497 transitions. [2020-08-18 12:19:06,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 12:19:06,139 INFO L276 IsEmpty]: Start isEmpty. Operand 5189 states and 8497 transitions. [2020-08-18 12:19:06,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-08-18 12:19:06,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 12:19:06,154 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 12:19:06,155 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 12:19:06,158 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 12:19:06,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 12:19:06,159 INFO L82 PathProgramCache]: Analyzing trace with hash -244647039, now seen corresponding path program 1 times [2020-08-18 12:19:06,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 12:19:06,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388855990] [2020-08-18 12:19:06,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 12:19:06,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:19:07,091 WARN L193 SmtUtils]: Spent 702.00 ms on a formula simplification that was a NOOP. DAG size: 391 [2020-08-18 12:19:07,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 12:19:07,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 12:19:07,378 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 12:19:07,379 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388855990] [2020-08-18 12:19:07,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 12:19:07,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 12:19:07,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529777563] [2020-08-18 12:19:07,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 12:19:07,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 12:19:07,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 12:19:07,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 12:19:07,381 INFO L87 Difference]: Start difference. First operand 5189 states and 8497 transitions. Second operand 4 states.