/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=NARROWEST --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_label26.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-13 10:03:29,010 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-13 10:03:29,014 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-13 10:03:29,066 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-13 10:03:29,067 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-13 10:03:29,077 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-13 10:03:29,080 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-13 10:03:29,084 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-13 10:03:29,087 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-13 10:03:29,090 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-13 10:03:29,091 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-13 10:03:29,092 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-13 10:03:29,093 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-13 10:03:29,096 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-13 10:03:29,099 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-13 10:03:29,101 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-13 10:03:29,103 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-13 10:03:29,105 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-13 10:03:29,109 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-13 10:03:29,118 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-13 10:03:29,121 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-13 10:03:29,122 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-13 10:03:29,123 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-13 10:03:29,125 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-13 10:03:29,138 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-13 10:03:29,139 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-13 10:03:29,143 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-13 10:03:29,144 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-13 10:03:29,145 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-13 10:03:29,146 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-13 10:03:29,149 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-13 10:03:29,150 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-13 10:03:29,155 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-13 10:03:29,156 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-13 10:03:29,156 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-13 10:03:29,156 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-13 10:03:29,159 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-13 10:03:29,159 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-13 10:03:29,160 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-13 10:03:29,161 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-13 10:03:29,161 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-13 10:03:29,162 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 [2020-10-13 10:03:29,185 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-13 10:03:29,185 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-13 10:03:29,187 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-13 10:03:29,187 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-13 10:03:29,187 INFO L138 SettingsManager]: * Use SBE=true [2020-10-13 10:03:29,188 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-13 10:03:29,188 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-13 10:03:29,188 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-13 10:03:29,188 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-13 10:03:29,188 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-13 10:03:29,188 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-13 10:03:29,189 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-13 10:03:29,189 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-13 10:03:29,189 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-13 10:03:29,189 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-13 10:03:29,189 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-13 10:03:29,190 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-13 10:03:29,190 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-13 10:03:29,190 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-13 10:03:29,190 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-13 10:03:29,190 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-13 10:03:29,191 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-13 10:03:29,191 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-13 10:03:29,191 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-13 10:03:29,191 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-13 10:03:29,191 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-13 10:03:29,192 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-13 10:03:29,192 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-13 10:03:29,192 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-13 10:03:29,192 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=NARROWEST;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=NARROWEST;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=NARROWEST;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=NARROWEST;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=NARROWEST;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=NARROWEST;log-additional-information=true;unknown-allowed=true; [2020-10-13 10:03:29,529 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-13 10:03:29,545 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-13 10:03:29,550 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-13 10:03:29,552 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-13 10:03:29,553 INFO L275 PluginConnector]: CDTParser initialized [2020-10-13 10:03:29,554 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem19_label26.c [2020-10-13 10:03:29,653 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf1c58950/eab6ec4fcec646c3abbe7c39ff429d70/FLAG83c673a2d [2020-10-13 10:03:30,654 INFO L306 CDTParser]: Found 1 translation units. [2020-10-13 10:03:30,655 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/eca-rers2012/Problem19_label26.c [2020-10-13 10:03:30,726 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf1c58950/eab6ec4fcec646c3abbe7c39ff429d70/FLAG83c673a2d [2020-10-13 10:03:31,057 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bf1c58950/eab6ec4fcec646c3abbe7c39ff429d70 [2020-10-13 10:03:31,067 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-13 10:03:31,069 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-13 10:03:31,071 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-13 10:03:31,071 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-13 10:03:31,077 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-13 10:03:31,078 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 10:03:31" (1/1) ... [2020-10-13 10:03:31,083 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59e74e20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:03:31, skipping insertion in model container [2020-10-13 10:03:31,084 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 10:03:31" (1/1) ... [2020-10-13 10:03:31,096 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-13 10:03:31,381 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-13 10:03:33,924 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 10:03:33,935 INFO L203 MainTranslator]: Completed pre-run [2020-10-13 10:03:35,021 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 10:03:35,086 INFO L208 MainTranslator]: Completed translation [2020-10-13 10:03:35,088 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:03:35 WrapperNode [2020-10-13 10:03:35,088 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-13 10:03:35,089 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-13 10:03:35,089 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-13 10:03:35,089 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-13 10:03:35,103 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:03:35" (1/1) ... [2020-10-13 10:03:35,104 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:03:35" (1/1) ... [2020-10-13 10:03:35,203 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:03:35" (1/1) ... [2020-10-13 10:03:35,204 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:03:35" (1/1) ... [2020-10-13 10:03:35,434 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:03:35" (1/1) ... [2020-10-13 10:03:35,518 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:03:35" (1/1) ... [2020-10-13 10:03:35,587 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:03:35" (1/1) ... [2020-10-13 10:03:35,655 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-13 10:03:35,656 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-13 10:03:35,656 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-13 10:03:35,656 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-13 10:03:35,658 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:03:35" (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 [2020-10-13 10:03:35,744 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-13 10:03:35,745 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-13 10:03:35,745 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2020-10-13 10:03:35,745 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2020-10-13 10:03:35,745 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2020-10-13 10:03:35,746 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2020-10-13 10:03:35,746 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output5 [2020-10-13 10:03:35,746 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output6 [2020-10-13 10:03:35,746 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-13 10:03:35,747 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2020-10-13 10:03:35,747 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2020-10-13 10:03:35,747 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2020-10-13 10:03:35,747 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2020-10-13 10:03:35,747 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output5 [2020-10-13 10:03:35,747 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output6 [2020-10-13 10:03:35,748 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-13 10:03:35,748 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-13 10:03:35,748 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-10-13 10:03:35,748 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-13 10:03:35,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-13 10:03:35,749 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-13 10:03:50,009 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-13 10:03:50,010 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-13 10:03:50,033 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 10:03:50 BoogieIcfgContainer [2020-10-13 10:03:50,033 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-13 10:03:50,035 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-13 10:03:50,035 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-13 10:03:50,038 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-13 10:03:50,038 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 10:03:31" (1/3) ... [2020-10-13 10:03:50,039 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66809cca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 10:03:50, skipping insertion in model container [2020-10-13 10:03:50,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:03:35" (2/3) ... [2020-10-13 10:03:50,040 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66809cca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 10:03:50, skipping insertion in model container [2020-10-13 10:03:50,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 10:03:50" (3/3) ... [2020-10-13 10:03:50,043 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem19_label26.c [2020-10-13 10:03:50,054 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-13 10:03:50,066 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-13 10:03:50,082 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-13 10:03:50,119 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-13 10:03:50,120 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-13 10:03:50,120 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-13 10:03:50,120 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-13 10:03:50,120 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-13 10:03:50,120 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-13 10:03:50,120 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-13 10:03:50,120 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-13 10:03:50,181 INFO L276 IsEmpty]: Start isEmpty. Operand 1777 states. [2020-10-13 10:03:50,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-13 10:03:50,197 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:03:50,199 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] [2020-10-13 10:03:50,199 INFO L427 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:03:50,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:03:50,207 INFO L82 PathProgramCache]: Analyzing trace with hash 2022464298, now seen corresponding path program 1 times [2020-10-13 10:03:50,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:03:50,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1400076146] [2020-10-13 10:03:50,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:03:50,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:03:50,448 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:03:50,911 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:03:50,911 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-13 10:03:50,912 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:03:50,912 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 521 [2020-10-13 10:03:50,914 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:03:50,915 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 10:03:50,915 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-13 10:03:50,915 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 34 [2020-10-13 10:03:50,915 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-13 10:03:51,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:03:51,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:03:51,026 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:03:51,036 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:03:51,036 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:03:51,037 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:03:51,037 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 11 [2020-10-13 10:03:51,037 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:03:51,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:03:51,038 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:03:51,038 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 10:03:51,038 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:03:51,051 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:03:51,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1400076146] [2020-10-13 10:03:51,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 10:03:51,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-13 10:03:51,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661728508] [2020-10-13 10:03:51,062 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-13 10:03:51,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:03:51,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-13 10:03:51,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 10:03:51,080 INFO L87 Difference]: Start difference. First operand 1777 states. Second operand 4 states. [2020-10-13 10:04:20,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:04:20,342 INFO L93 Difference]: Finished difference Result 5111 states and 9601 transitions. [2020-10-13 10:04:20,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 10:04:20,345 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 32 [2020-10-13 10:04:20,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:04:20,396 INFO L225 Difference]: With dead ends: 5111 [2020-10-13 10:04:20,396 INFO L226 Difference]: Without dead ends: 3270 [2020-10-13 10:04:20,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-13 10:04:20,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3270 states. [2020-10-13 10:04:20,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3270 to 3199. [2020-10-13 10:04:20,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3199 states. [2020-10-13 10:04:20,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3199 states to 3199 states and 5483 transitions. [2020-10-13 10:04:20,662 INFO L78 Accepts]: Start accepts. Automaton has 3199 states and 5483 transitions. Word has length 32 [2020-10-13 10:04:20,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:04:20,663 INFO L479 AbstractCegarLoop]: Abstraction has 3199 states and 5483 transitions. [2020-10-13 10:04:20,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-13 10:04:20,664 INFO L276 IsEmpty]: Start isEmpty. Operand 3199 states and 5483 transitions. [2020-10-13 10:04:20,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-10-13 10:04:20,670 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:04:20,671 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2020-10-13 10:04:20,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-13 10:04:20,672 INFO L427 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:04:20,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:04:20,672 INFO L82 PathProgramCache]: Analyzing trace with hash -2060753195, now seen corresponding path program 1 times [2020-10-13 10:04:20,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:04:20,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [605230481] [2020-10-13 10:04:20,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:04:20,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:04:20,767 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:21,133 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:22,242 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:04:22,243 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 114 [2020-10-13 10:04:22,243 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:04:22,243 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1513 [2020-10-13 10:04:22,245 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:04:22,246 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 10:04:22,246 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 82 [2020-10-13 10:04:22,246 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 31 [2020-10-13 10:04:22,247 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-13 10:04:22,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:04:22,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:04:22,387 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:22,393 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:04:22,393 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:04:22,394 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:04:22,394 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-10-13 10:04:22,394 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:04:22,394 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:04:22,396 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:04:22,396 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:04:22,396 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-13 10:04:22,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-13 10:04:22,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:04:22,474 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:04:22,582 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:04:22,592 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 73 [2020-10-13 10:04:22,592 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:04:22,593 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 125 [2020-10-13 10:04:22,593 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:04:22,594 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:04:22,595 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:04:22,595 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 67 [2020-10-13 10:04:22,595 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-13 10:04:22,665 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:04:22,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [605230481] [2020-10-13 10:04:22,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:04:22,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 10:04:22,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607420512] [2020-10-13 10:04:22,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 10:04:22,672 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:04:22,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 10:04:22,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 10:04:22,673 INFO L87 Difference]: Start difference. First operand 3199 states and 5483 transitions. Second operand 5 states. [2020-10-13 10:05:05,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:05:05,206 INFO L93 Difference]: Finished difference Result 7905 states and 13886 transitions. [2020-10-13 10:05:05,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 10:05:05,210 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 104 [2020-10-13 10:05:05,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:05:05,242 INFO L225 Difference]: With dead ends: 7905 [2020-10-13 10:05:05,243 INFO L226 Difference]: Without dead ends: 4712 [2020-10-13 10:05:05,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-10-13 10:05:05,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4712 states. [2020-10-13 10:05:05,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4712 to 4652. [2020-10-13 10:05:05,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4652 states. [2020-10-13 10:05:05,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4652 states to 4652 states and 7682 transitions. [2020-10-13 10:05:05,415 INFO L78 Accepts]: Start accepts. Automaton has 4652 states and 7682 transitions. Word has length 104 [2020-10-13 10:05:05,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:05:05,419 INFO L479 AbstractCegarLoop]: Abstraction has 4652 states and 7682 transitions. [2020-10-13 10:05:05,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 10:05:05,420 INFO L276 IsEmpty]: Start isEmpty. Operand 4652 states and 7682 transitions. [2020-10-13 10:05:05,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2020-10-13 10:05:05,434 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:05:05,434 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2020-10-13 10:05:05,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-13 10:05:05,435 INFO L427 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:05:05,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:05:05,436 INFO L82 PathProgramCache]: Analyzing trace with hash 35358019, now seen corresponding path program 1 times [2020-10-13 10:05:05,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:05:05,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [834934326] [2020-10-13 10:05:05,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:05:05,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:05:05,531 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:05:05,875 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:05:06,712 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:05:06,713 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 141 [2020-10-13 10:05:06,714 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:05:06,714 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1217 [2020-10-13 10:05:06,714 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:05:06,714 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 10:05:06,715 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 109 [2020-10-13 10:05:06,715 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 31 [2020-10-13 10:05:06,715 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:05:06,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:05:06,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:05:06,845 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:05:06,848 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:05:06,849 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:05:06,849 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:05:06,849 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-13 10:05:06,850 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:05:06,850 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:05:06,850 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:05:06,850 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:05:06,850 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:05:06,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-13 10:05:06,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:05:06,936 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:05:07,064 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:05:07,064 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 100 [2020-10-13 10:05:07,065 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:05:07,065 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 151 [2020-10-13 10:05:07,066 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:05:07,066 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:05:07,066 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:05:07,066 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 94 [2020-10-13 10:05:07,067 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:05:07,196 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:05:07,197 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [834934326] [2020-10-13 10:05:07,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:05:07,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-13 10:05:07,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885262290] [2020-10-13 10:05:07,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-13 10:05:07,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:05:07,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-13 10:05:07,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-10-13 10:05:07,201 INFO L87 Difference]: Start difference. First operand 4652 states and 7682 transitions. Second operand 6 states. [2020-10-13 10:06:03,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:06:03,192 INFO L93 Difference]: Finished difference Result 17773 states and 30091 transitions. [2020-10-13 10:06:03,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-13 10:06:03,195 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 131 [2020-10-13 10:06:03,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:06:03,274 INFO L225 Difference]: With dead ends: 17773 [2020-10-13 10:06:03,274 INFO L226 Difference]: Without dead ends: 13127 [2020-10-13 10:06:03,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 10:06:03,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13127 states. [2020-10-13 10:06:03,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13127 to 13115. [2020-10-13 10:06:03,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13115 states. [2020-10-13 10:06:03,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13115 states to 13115 states and 20145 transitions. [2020-10-13 10:06:03,706 INFO L78 Accepts]: Start accepts. Automaton has 13115 states and 20145 transitions. Word has length 131 [2020-10-13 10:06:03,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:06:03,709 INFO L479 AbstractCegarLoop]: Abstraction has 13115 states and 20145 transitions. [2020-10-13 10:06:03,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-13 10:06:03,709 INFO L276 IsEmpty]: Start isEmpty. Operand 13115 states and 20145 transitions. [2020-10-13 10:06:03,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-10-13 10:06:03,720 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:06:03,721 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2020-10-13 10:06:03,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-13 10:06:03,725 INFO L427 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:06:03,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:06:03,727 INFO L82 PathProgramCache]: Analyzing trace with hash -760767100, now seen corresponding path program 1 times [2020-10-13 10:06:03,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:06:03,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119036662] [2020-10-13 10:06:03,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:06:03,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:06:03,827 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:06:04,429 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:06:04,430 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 176 [2020-10-13 10:06:04,430 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:06:04,430 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 639 [2020-10-13 10:06:04,431 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:06:04,431 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 10:06:04,431 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-13 10:06:04,431 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 140 [2020-10-13 10:06:04,432 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:06:04,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:06:04,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:06:04,524 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:06:04,529 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:06:04,530 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:06:04,530 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:06:04,530 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-10-13 10:06:04,530 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:06:04,531 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:06:04,531 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:06:04,531 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 10:06:04,531 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:06:04,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-13 10:06:04,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:06:04,631 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:06:04,853 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:06:04,854 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 135 [2020-10-13 10:06:04,854 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:06:04,854 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 245 [2020-10-13 10:06:04,854 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:06:04,855 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 10:06:04,855 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-13 10:06:04,855 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 135 [2020-10-13 10:06:04,855 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:06:05,094 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:06:05,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119036662] [2020-10-13 10:06:05,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 10:06:05,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-13 10:06:05,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776689630] [2020-10-13 10:06:05,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-13 10:06:05,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:06:05,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-13 10:06:05,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-13 10:06:05,098 INFO L87 Difference]: Start difference. First operand 13115 states and 20145 transitions. Second operand 7 states. [2020-10-13 10:07:13,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:07:13,349 INFO L93 Difference]: Finished difference Result 31027 states and 48928 transitions. [2020-10-13 10:07:13,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-13 10:07:13,352 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 166 [2020-10-13 10:07:13,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:07:13,458 INFO L225 Difference]: With dead ends: 31027 [2020-10-13 10:07:13,458 INFO L226 Difference]: Without dead ends: 17918 [2020-10-13 10:07:13,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-10-13 10:07:13,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17918 states. [2020-10-13 10:07:13,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17918 to 17790. [2020-10-13 10:07:13,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17790 states. [2020-10-13 10:07:14,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17790 states to 17790 states and 26927 transitions. [2020-10-13 10:07:14,032 INFO L78 Accepts]: Start accepts. Automaton has 17790 states and 26927 transitions. Word has length 166 [2020-10-13 10:07:14,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:07:14,034 INFO L479 AbstractCegarLoop]: Abstraction has 17790 states and 26927 transitions. [2020-10-13 10:07:14,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-13 10:07:14,034 INFO L276 IsEmpty]: Start isEmpty. Operand 17790 states and 26927 transitions. [2020-10-13 10:07:14,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2020-10-13 10:07:14,041 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:07:14,041 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2020-10-13 10:07:14,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-13 10:07:14,042 INFO L427 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:07:14,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:07:14,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1393376281, now seen corresponding path program 1 times [2020-10-13 10:07:14,042 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:07:14,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [538693307] [2020-10-13 10:07:14,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:07:14,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:07:14,119 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:07:14,269 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:07:16,256 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:07:16,257 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 254 [2020-10-13 10:07:16,257 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:07:16,257 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2163 [2020-10-13 10:07:16,258 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:07:16,258 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 10:07:16,258 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-13 10:07:16,258 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 82 [2020-10-13 10:07:16,258 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:07:16,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:07:16,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:07:16,356 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:07:16,360 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:07:16,360 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:07:16,361 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:07:16,361 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-10-13 10:07:16,361 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:07:16,361 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:07:16,362 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:07:16,362 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 10:07:16,362 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:07:16,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-10-13 10:07:16,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:07:16,433 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:07:16,536 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:07:16,537 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 77 [2020-10-13 10:07:16,537 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:07:16,537 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 113 [2020-10-13 10:07:16,538 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:07:16,538 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 10:07:16,538 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 0 [2020-10-13 10:07:16,538 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 77 [2020-10-13 10:07:16,539 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:07:16,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 84 [2020-10-13 10:07:16,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:07:16,683 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:07:16,761 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:07:16,761 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 135 [2020-10-13 10:07:16,762 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:07:16,762 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 103 [2020-10-13 10:07:16,762 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:07:16,762 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:07:16,763 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 132 [2020-10-13 10:07:16,763 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:07:16,763 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:07:16,884 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 50 proven. 71 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-13 10:07:16,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [538693307] [2020-10-13 10:07:16,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:07:16,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-13 10:07:16,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738058932] [2020-10-13 10:07:16,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-13 10:07:16,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:07:16,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-13 10:07:16,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-13 10:07:16,888 INFO L87 Difference]: Start difference. First operand 17790 states and 26927 transitions. Second operand 7 states.