/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 --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/eca-rers2012/Problem19_label17.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-12 15:13:53,699 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-12 15:13:53,701 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-12 15:13:53,726 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-12 15:13:53,726 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-12 15:13:53,727 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-12 15:13:53,729 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-12 15:13:53,731 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-12 15:13:53,733 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-12 15:13:53,734 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-12 15:13:53,735 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-12 15:13:53,736 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-12 15:13:53,736 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-12 15:13:53,738 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-12 15:13:53,739 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-12 15:13:53,740 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-12 15:13:53,741 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-12 15:13:53,742 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-12 15:13:53,746 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-12 15:13:53,750 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-12 15:13:53,752 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-12 15:13:53,757 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-12 15:13:53,759 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-12 15:13:53,760 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-12 15:13:53,763 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-12 15:13:53,763 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-12 15:13:53,763 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-12 15:13:53,768 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-12 15:13:53,771 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-12 15:13:53,772 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-12 15:13:53,772 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-12 15:13:53,773 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-12 15:13:53,775 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-12 15:13:53,776 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-12 15:13:53,778 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-12 15:13:53,778 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-12 15:13:53,779 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-12 15:13:53,779 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-12 15:13:53,780 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-12 15:13:53,781 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-12 15:13:53,782 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-12 15:13:53,783 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 [2020-10-12 15:13:53,836 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-12 15:13:53,836 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-12 15:13:53,838 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-12 15:13:53,838 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-12 15:13:53,839 INFO L138 SettingsManager]: * Use SBE=true [2020-10-12 15:13:53,839 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-12 15:13:53,839 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-12 15:13:53,839 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-12 15:13:53,839 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-12 15:13:53,840 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-12 15:13:53,840 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-12 15:13:53,840 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-12 15:13:53,840 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-12 15:13:53,840 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-12 15:13:53,840 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-12 15:13:53,841 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-12 15:13:53,841 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-12 15:13:53,842 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-12 15:13:53,842 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-12 15:13:53,843 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-12 15:13:53,843 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-12 15:13:53,843 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-12 15:13:53,843 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-12 15:13:53,843 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-12 15:13:53,844 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-12 15:13:53,844 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-12 15:13:53,844 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-12 15:13:53,844 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-12 15:13:53,844 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-12 15:13:53,844 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.rcfgbuilder: Size of a code block -> SequenceOfStatements 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 -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; [2020-10-12 15:13:54,189 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-12 15:13:54,203 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-12 15:13:54,206 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-12 15:13:54,208 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-12 15:13:54,208 INFO L275 PluginConnector]: CDTParser initialized [2020-10-12 15:13:54,208 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem19_label17.c [2020-10-12 15:13:54,282 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e5ce6d236/785c05d62884492cb4b0db14f7797d55/FLAG9ba365668 [2020-10-12 15:13:55,231 INFO L306 CDTParser]: Found 1 translation units. [2020-10-12 15:13:55,232 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/eca-rers2012/Problem19_label17.c [2020-10-12 15:13:55,287 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e5ce6d236/785c05d62884492cb4b0db14f7797d55/FLAG9ba365668 [2020-10-12 15:13:55,639 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e5ce6d236/785c05d62884492cb4b0db14f7797d55 [2020-10-12 15:13:55,648 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-12 15:13:55,650 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-12 15:13:55,651 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-12 15:13:55,651 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-12 15:13:55,658 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-12 15:13:55,660 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 03:13:55" (1/1) ... [2020-10-12 15:13:55,664 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@742d25d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 03:13:55, skipping insertion in model container [2020-10-12 15:13:55,664 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 03:13:55" (1/1) ... [2020-10-12 15:13:55,673 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-12 15:13:55,948 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-12 15:13:58,322 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 15:13:58,327 INFO L203 MainTranslator]: Completed pre-run [2020-10-12 15:13:59,337 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 15:13:59,389 INFO L208 MainTranslator]: Completed translation [2020-10-12 15:13:59,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 03:13:59 WrapperNode [2020-10-12 15:13:59,389 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-12 15:13:59,390 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-12 15:13:59,390 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-12 15:13:59,391 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-12 15:13:59,406 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 03:13:59" (1/1) ... [2020-10-12 15:13:59,409 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 03:13:59" (1/1) ... [2020-10-12 15:13:59,512 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 03:13:59" (1/1) ... [2020-10-12 15:13:59,513 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 03:13:59" (1/1) ... [2020-10-12 15:13:59,681 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 03:13:59" (1/1) ... [2020-10-12 15:13:59,755 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 03:13:59" (1/1) ... [2020-10-12 15:13:59,983 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 03:13:59" (1/1) ... [2020-10-12 15:14:00,086 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-12 15:14:00,087 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-12 15:14:00,087 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-12 15:14:00,087 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-12 15:14:00,088 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 03:13:59" (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 [2020-10-12 15:14:00,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-12 15:14:00,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-12 15:14:00,176 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-10-12 15:14:00,176 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2020-10-12 15:14:00,176 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2020-10-12 15:14:00,176 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2020-10-12 15:14:00,177 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output5 [2020-10-12 15:14:00,177 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output6 [2020-10-12 15:14:00,177 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-12 15:14:00,177 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-10-12 15:14:00,178 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2020-10-12 15:14:00,178 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2020-10-12 15:14:00,178 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2020-10-12 15:14:00,178 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output5 [2020-10-12 15:14:00,178 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output6 [2020-10-12 15:14:00,179 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-12 15:14:00,179 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-12 15:14:00,179 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-12 15:14:00,179 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-12 15:14:00,179 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-12 15:14:00,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-12 15:14:13,158 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-12 15:14:13,159 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-12 15:14:13,177 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 03:14:13 BoogieIcfgContainer [2020-10-12 15:14:13,178 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-12 15:14:13,179 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-12 15:14:13,179 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-12 15:14:13,183 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-12 15:14:13,183 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.10 03:13:55" (1/3) ... [2020-10-12 15:14:13,184 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a7b64e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 03:14:13, skipping insertion in model container [2020-10-12 15:14:13,185 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 03:13:59" (2/3) ... [2020-10-12 15:14:13,185 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a7b64e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 03:14:13, skipping insertion in model container [2020-10-12 15:14:13,185 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 03:14:13" (3/3) ... [2020-10-12 15:14:13,189 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem19_label17.c [2020-10-12 15:14:13,200 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-12 15:14:13,210 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-12 15:14:13,226 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-12 15:14:13,256 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-12 15:14:13,256 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-12 15:14:13,256 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-12 15:14:13,256 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-12 15:14:13,256 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-12 15:14:13,257 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-12 15:14:13,257 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-12 15:14:13,257 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-12 15:14:13,303 INFO L276 IsEmpty]: Start isEmpty. Operand 1777 states. [2020-10-12 15:14:13,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-12 15:14:13,310 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 15:14:13,311 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 15:14:13,311 INFO L427 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 15:14:13,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 15:14:13,318 INFO L82 PathProgramCache]: Analyzing trace with hash -1022961430, now seen corresponding path program 1 times [2020-10-12 15:14:13,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 15:14:13,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [897624585] [2020-10-12 15:14:13,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 15:14:13,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:14:13,510 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:14:13,804 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:14:13,805 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-10-12 15:14:13,805 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 15:14:13,806 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 327 [2020-10-12 15:14:13,808 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:14:13,808 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-12 15:14:13,808 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-12 15:14:13,809 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-10-12 15:14:13,809 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-12 15:14:13,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 15:14:13,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:14:13,917 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:14:13,926 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:14:13,927 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 15:14:13,927 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 15:14:13,927 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 11 [2020-10-12 15:14:13,927 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:14:13,928 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-12 15:14:13,928 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 15:14:13,928 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-12 15:14:13,928 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 15:14:13,942 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 15:14:13,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [897624585] [2020-10-12 15:14:13,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 15:14:13,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-12 15:14:13,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005900010] [2020-10-12 15:14:13,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-12 15:14:13,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 15:14:13,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-12 15:14:13,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-12 15:14:13,976 INFO L87 Difference]: Start difference. First operand 1777 states. Second operand 4 states. [2020-10-12 15:14:37,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 15:14:37,481 INFO L93 Difference]: Finished difference Result 5095 states and 9566 transitions. [2020-10-12 15:14:37,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-12 15:14:37,484 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-10-12 15:14:37,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 15:14:37,524 INFO L225 Difference]: With dead ends: 5095 [2020-10-12 15:14:37,524 INFO L226 Difference]: Without dead ends: 3254 [2020-10-12 15:14:37,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-12 15:14:37,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3254 states. [2020-10-12 15:14:37,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3254 to 3208. [2020-10-12 15:14:37,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3208 states. [2020-10-12 15:14:37,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3208 states to 3208 states and 5177 transitions. [2020-10-12 15:14:37,785 INFO L78 Accepts]: Start accepts. Automaton has 3208 states and 5177 transitions. Word has length 16 [2020-10-12 15:14:37,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 15:14:37,785 INFO L479 AbstractCegarLoop]: Abstraction has 3208 states and 5177 transitions. [2020-10-12 15:14:37,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-12 15:14:37,786 INFO L276 IsEmpty]: Start isEmpty. Operand 3208 states and 5177 transitions. [2020-10-12 15:14:37,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-10-12 15:14:37,790 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 15:14:37,791 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 15:14:37,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-12 15:14:37,792 INFO L427 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 15:14:37,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 15:14:37,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1800264865, now seen corresponding path program 1 times [2020-10-12 15:14:37,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 15:14:37,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [995840612] [2020-10-12 15:14:37,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 15:14:37,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:14:37,871 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:14:38,222 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:14:39,033 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:14:39,111 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:14:39,111 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 101 [2020-10-12 15:14:39,112 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-12 15:14:39,112 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1270 [2020-10-12 15:14:39,114 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:14:39,114 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-12 15:14:39,114 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-12 15:14:39,115 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 95 [2020-10-12 15:14:39,120 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 7 [2020-10-12 15:14:39,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 15:14:39,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:14:39,208 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:14:39,214 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:14:39,215 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 15:14:39,215 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 15:14:39,215 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-10-12 15:14:39,216 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:14:39,216 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-12 15:14:39,216 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 15:14:39,216 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-12 15:14:39,217 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 15:14:39,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-12 15:14:39,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:14:39,277 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:14:39,394 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:14:39,428 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:14:39,428 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 76 [2020-10-12 15:14:39,428 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 15:14:39,429 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 166 [2020-10-12 15:14:39,429 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:14:39,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-12 15:14:39,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-12 15:14:39,430 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 76 [2020-10-12 15:14:39,430 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 15:14:39,563 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-10-12 15:14:39,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [995840612] [2020-10-12 15:14:39,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 15:14:39,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-12 15:14:39,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046970644] [2020-10-12 15:14:39,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-12 15:14:39,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 15:14:39,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-12 15:14:39,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-12 15:14:39,571 INFO L87 Difference]: Start difference. First operand 3208 states and 5177 transitions. Second operand 7 states. [2020-10-12 15:15:25,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 15:15:25,247 INFO L93 Difference]: Finished difference Result 9447 states and 15354 transitions. [2020-10-12 15:15:25,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-12 15:15:25,250 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 91 [2020-10-12 15:15:25,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 15:15:25,292 INFO L225 Difference]: With dead ends: 9447 [2020-10-12 15:15:25,293 INFO L226 Difference]: Without dead ends: 6245 [2020-10-12 15:15:25,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-10-12 15:15:25,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6245 states. [2020-10-12 15:15:25,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6245 to 6145. [2020-10-12 15:15:25,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6145 states. [2020-10-12 15:15:25,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6145 states to 6145 states and 8622 transitions. [2020-10-12 15:15:25,524 INFO L78 Accepts]: Start accepts. Automaton has 6145 states and 8622 transitions. Word has length 91 [2020-10-12 15:15:25,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 15:15:25,525 INFO L479 AbstractCegarLoop]: Abstraction has 6145 states and 8622 transitions. [2020-10-12 15:15:25,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-12 15:15:25,526 INFO L276 IsEmpty]: Start isEmpty. Operand 6145 states and 8622 transitions. [2020-10-12 15:15:25,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-10-12 15:15:25,536 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 15:15:25,537 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 15:15:25,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-12 15:15:25,537 INFO L427 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 15:15:25,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 15:15:25,538 INFO L82 PathProgramCache]: Analyzing trace with hash 1324402687, now seen corresponding path program 1 times [2020-10-12 15:15:25,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 15:15:25,539 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929293275] [2020-10-12 15:15:25,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 15:15:25,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:15:25,641 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:15:25,778 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:15:27,409 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:15:27,410 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 127 [2020-10-12 15:15:27,410 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 15:15:27,410 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1804 [2020-10-12 15:15:27,411 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:15:27,411 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-12 15:15:27,411 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-12 15:15:27,411 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 107 [2020-10-12 15:15:27,412 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 15:15:27,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 15:15:27,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:15:27,518 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:15:27,525 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:15:27,526 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 15:15:27,526 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 15:15:27,526 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-10-12 15:15:27,526 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:15:27,526 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-12 15:15:27,527 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 15:15:27,527 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-12 15:15:27,527 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 15:15:27,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-12 15:15:27,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:15:27,613 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:15:27,844 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:15:27,844 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 102 [2020-10-12 15:15:27,845 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 15:15:27,845 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 250 [2020-10-12 15:15:27,845 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:15:27,845 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-12 15:15:27,846 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-12 15:15:27,846 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 102 [2020-10-12 15:15:27,846 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 15:15:27,967 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 15:15:27,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [929293275] [2020-10-12 15:15:27,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 15:15:27,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-12 15:15:27,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830630923] [2020-10-12 15:15:27,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-12 15:15:27,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 15:15:27,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-12 15:15:27,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-12 15:15:27,972 INFO L87 Difference]: Start difference. First operand 6145 states and 8622 transitions. Second operand 7 states. [2020-10-12 15:16:26,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 15:16:26,833 INFO L93 Difference]: Finished difference Result 18714 states and 26691 transitions. [2020-10-12 15:16:26,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-12 15:16:26,836 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 117 [2020-10-12 15:16:26,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 15:16:26,903 INFO L225 Difference]: With dead ends: 18714 [2020-10-12 15:16:26,904 INFO L226 Difference]: Without dead ends: 12575 [2020-10-12 15:16:26,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-10-12 15:16:26,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12575 states. [2020-10-12 15:16:27,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12575 to 12323. [2020-10-12 15:16:27,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12323 states. [2020-10-12 15:16:27,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12323 states to 12323 states and 15882 transitions. [2020-10-12 15:16:27,245 INFO L78 Accepts]: Start accepts. Automaton has 12323 states and 15882 transitions. Word has length 117 [2020-10-12 15:16:27,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 15:16:27,248 INFO L479 AbstractCegarLoop]: Abstraction has 12323 states and 15882 transitions. [2020-10-12 15:16:27,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-12 15:16:27,249 INFO L276 IsEmpty]: Start isEmpty. Operand 12323 states and 15882 transitions. [2020-10-12 15:16:27,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2020-10-12 15:16:27,257 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 15:16:27,257 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 15:16:27,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-12 15:16:27,258 INFO L427 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 15:16:27,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 15:16:27,258 INFO L82 PathProgramCache]: Analyzing trace with hash -1476991021, now seen corresponding path program 1 times [2020-10-12 15:16:27,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 15:16:27,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [851545647] [2020-10-12 15:16:27,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 15:16:27,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:16:27,325 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:16:27,379 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:16:27,474 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:16:27,848 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:16:28,722 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:16:28,723 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 149 [2020-10-12 15:16:28,723 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-12 15:16:28,732 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1424 [2020-10-12 15:16:28,733 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:16:28,735 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-12 15:16:28,735 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-12 15:16:28,735 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 127 [2020-10-12 15:16:28,735 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-12 15:16:28,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 15:16:28,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:16:28,862 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:16:28,872 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:16:28,872 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 15:16:28,872 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 15:16:28,872 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 10 [2020-10-12 15:16:28,873 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:16:28,873 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-12 15:16:28,873 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 15:16:28,873 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-12 15:16:28,873 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 15:16:28,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-12 15:16:28,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:16:28,968 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:16:29,055 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:16:29,184 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:16:29,184 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 124 [2020-10-12 15:16:29,185 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 15:16:29,185 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 234 [2020-10-12 15:16:29,185 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:16:29,185 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-12 15:16:29,185 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-12 15:16:29,186 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 124 [2020-10-12 15:16:29,186 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 15:16:29,325 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 15:16:29,326 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [851545647] [2020-10-12 15:16:29,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 15:16:29,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-12 15:16:29,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511473709] [2020-10-12 15:16:29,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-12 15:16:29,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 15:16:29,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-12 15:16:29,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-12 15:16:29,332 INFO L87 Difference]: Start difference. First operand 12323 states and 15882 transitions. Second operand 7 states. [2020-10-12 15:17:23,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 15:17:23,857 INFO L93 Difference]: Finished difference Result 37254 states and 48929 transitions. [2020-10-12 15:17:23,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-12 15:17:23,862 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 139 [2020-10-12 15:17:23,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 15:17:23,963 INFO L225 Difference]: With dead ends: 37254 [2020-10-12 15:17:23,963 INFO L226 Difference]: Without dead ends: 24937 [2020-10-12 15:17:23,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-10-12 15:17:24,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24937 states. [2020-10-12 15:17:24,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24937 to 24523. [2020-10-12 15:17:24,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24523 states. [2020-10-12 15:17:24,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24523 states to 24523 states and 30768 transitions. [2020-10-12 15:17:24,648 INFO L78 Accepts]: Start accepts. Automaton has 24523 states and 30768 transitions. Word has length 139 [2020-10-12 15:17:24,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 15:17:24,652 INFO L479 AbstractCegarLoop]: Abstraction has 24523 states and 30768 transitions. [2020-10-12 15:17:24,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-12 15:17:24,652 INFO L276 IsEmpty]: Start isEmpty. Operand 24523 states and 30768 transitions. [2020-10-12 15:17:24,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2020-10-12 15:17:24,654 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 15:17:24,654 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 15:17:24,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-12 15:17:24,655 INFO L427 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 15:17:24,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 15:17:24,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1081931518, now seen corresponding path program 1 times [2020-10-12 15:17:24,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 15:17:24,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [723221477] [2020-10-12 15:17:24,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 15:17:24,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:17:24,744 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:17:25,036 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:17:25,966 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:17:25,967 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 188 [2020-10-12 15:17:25,967 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 15:17:25,967 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1260 [2020-10-12 15:17:25,967 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:17:25,968 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-12 15:17:25,968 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-12 15:17:25,968 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 168 [2020-10-12 15:17:25,968 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 15:17:26,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 15:17:26,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:17:26,089 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:17:26,094 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:17:26,094 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 15:17:26,095 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 15:17:26,095 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-10-12 15:17:26,095 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:17:26,096 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-12 15:17:26,096 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 15:17:26,096 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-12 15:17:26,096 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 15:17:26,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-12 15:17:26,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 15:17:26,212 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 15:17:26,471 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 15:17:26,471 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 163 [2020-10-12 15:17:26,472 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 15:17:26,472 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 291 [2020-10-12 15:17:26,472 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 15:17:26,472 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-12 15:17:26,472 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-12 15:17:26,473 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 163 [2020-10-12 15:17:26,473 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 15:17:26,651 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 15:17:26,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [723221477] [2020-10-12 15:17:26,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 15:17:26,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-12 15:17:26,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947200806] [2020-10-12 15:17:26,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-12 15:17:26,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 15:17:26,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-12 15:17:26,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-12 15:17:26,654 INFO L87 Difference]: Start difference. First operand 24523 states and 30768 transitions. Second operand 7 states.