/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/array-examples/standard_two_index_07.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-13 05:02:13,004 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-13 05:02:13,006 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-13 05:02:13,030 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-13 05:02:13,030 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-13 05:02:13,031 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-13 05:02:13,032 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-13 05:02:13,034 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-13 05:02:13,036 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-13 05:02:13,037 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-13 05:02:13,038 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-13 05:02:13,039 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-13 05:02:13,039 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-13 05:02:13,040 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-13 05:02:13,041 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-13 05:02:13,042 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-13 05:02:13,043 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-13 05:02:13,044 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-13 05:02:13,046 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-13 05:02:13,048 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-13 05:02:13,049 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-13 05:02:13,050 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-13 05:02:13,052 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-13 05:02:13,052 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-13 05:02:13,055 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-13 05:02:13,055 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-13 05:02:13,060 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-13 05:02:13,061 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-13 05:02:13,061 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-13 05:02:13,062 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-13 05:02:13,062 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-13 05:02:13,063 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-13 05:02:13,064 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-13 05:02:13,064 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-13 05:02:13,069 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-13 05:02:13,069 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-13 05:02:13,070 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-13 05:02:13,070 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-13 05:02:13,070 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-13 05:02:13,072 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-13 05:02:13,072 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-13 05:02:13,075 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 05:02:13,121 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-13 05:02:13,122 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-13 05:02:13,123 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-13 05:02:13,123 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-13 05:02:13,124 INFO L138 SettingsManager]: * Use SBE=true [2020-10-13 05:02:13,124 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-13 05:02:13,124 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-13 05:02:13,124 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-13 05:02:13,124 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-13 05:02:13,124 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-13 05:02:13,125 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-13 05:02:13,125 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-13 05:02:13,125 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-13 05:02:13,125 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-13 05:02:13,125 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-13 05:02:13,126 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-13 05:02:13,126 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-13 05:02:13,127 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-13 05:02:13,127 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-13 05:02:13,127 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-13 05:02:13,128 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-13 05:02:13,128 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-13 05:02:13,128 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-13 05:02:13,128 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-13 05:02:13,129 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-13 05:02:13,129 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-13 05:02:13,129 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-13 05:02:13,129 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-13 05:02:13,129 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-13 05:02:13,130 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 05:02:13,445 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-13 05:02:13,457 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-13 05:02:13,461 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-13 05:02:13,462 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-13 05:02:13,463 INFO L275 PluginConnector]: CDTParser initialized [2020-10-13 05:02:13,464 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_two_index_07.i [2020-10-13 05:02:13,528 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c8cc3c918/9d894c5f399742249e773328056784e9/FLAG50bccb759 [2020-10-13 05:02:13,949 INFO L306 CDTParser]: Found 1 translation units. [2020-10-13 05:02:13,950 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-examples/standard_two_index_07.i [2020-10-13 05:02:13,957 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c8cc3c918/9d894c5f399742249e773328056784e9/FLAG50bccb759 [2020-10-13 05:02:14,315 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c8cc3c918/9d894c5f399742249e773328056784e9 [2020-10-13 05:02:14,325 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-13 05:02:14,327 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-13 05:02:14,330 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-13 05:02:14,330 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-13 05:02:14,334 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-13 05:02:14,335 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:02:14" (1/1) ... [2020-10-13 05:02:14,338 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d228d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:02:14, skipping insertion in model container [2020-10-13 05:02:14,339 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:02:14" (1/1) ... [2020-10-13 05:02:14,348 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-13 05:02:14,368 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-13 05:02:14,622 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 05:02:14,629 INFO L203 MainTranslator]: Completed pre-run [2020-10-13 05:02:14,658 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 05:02:14,679 INFO L208 MainTranslator]: Completed translation [2020-10-13 05:02:14,680 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:02:14 WrapperNode [2020-10-13 05:02:14,680 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-13 05:02:14,680 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-13 05:02:14,681 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-13 05:02:14,681 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-13 05:02:14,767 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:02:14" (1/1) ... [2020-10-13 05:02:14,767 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:02:14" (1/1) ... [2020-10-13 05:02:14,777 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:02:14" (1/1) ... [2020-10-13 05:02:14,778 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:02:14" (1/1) ... [2020-10-13 05:02:14,796 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:02:14" (1/1) ... [2020-10-13 05:02:14,801 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:02:14" (1/1) ... [2020-10-13 05:02:14,802 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:02:14" (1/1) ... [2020-10-13 05:02:14,804 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-13 05:02:14,804 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-13 05:02:14,805 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-13 05:02:14,805 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-13 05:02:14,806 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:02:14" (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 05:02:14,865 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-13 05:02:14,866 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-13 05:02:14,866 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-13 05:02:14,866 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-13 05:02:14,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-13 05:02:14,867 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-13 05:02:14,867 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-13 05:02:14,868 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-13 05:02:14,868 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-13 05:02:14,868 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-13 05:02:14,868 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-13 05:02:14,869 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-13 05:02:14,869 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-13 05:02:14,869 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-13 05:02:15,084 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-13 05:02:15,084 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-10-13 05:02:15,088 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:02:15 BoogieIcfgContainer [2020-10-13 05:02:15,089 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-13 05:02:15,090 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-13 05:02:15,090 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-13 05:02:15,093 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-13 05:02:15,093 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:02:14" (1/3) ... [2020-10-13 05:02:15,094 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15bcbd39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:02:15, skipping insertion in model container [2020-10-13 05:02:15,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:02:14" (2/3) ... [2020-10-13 05:02:15,095 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15bcbd39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:02:15, skipping insertion in model container [2020-10-13 05:02:15,095 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:02:15" (3/3) ... [2020-10-13 05:02:15,096 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_two_index_07.i [2020-10-13 05:02:15,107 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-13 05:02:15,114 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-13 05:02:15,156 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-13 05:02:15,207 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-13 05:02:15,208 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-13 05:02:15,208 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-13 05:02:15,209 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-13 05:02:15,209 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-13 05:02:15,209 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-13 05:02:15,209 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-13 05:02:15,209 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-13 05:02:15,232 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-10-13 05:02:15,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-13 05:02:15,237 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:15,238 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:15,238 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:15,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:15,244 INFO L82 PathProgramCache]: Analyzing trace with hash -2029643862, now seen corresponding path program 1 times [2020-10-13 05:02:15,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:15,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1848617483] [2020-10-13 05:02:15,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:15,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:15,386 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:15,434 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:15,554 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:15,554 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-13 05:02:15,554 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:02:15,555 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 186 [2020-10-13 05:02:15,557 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:15,558 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:15,558 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 05:02:15,558 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:15,558 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-13 05:02:15,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:15,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:15,649 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:15,661 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:15,661 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:15,661 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:15,662 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 12 [2020-10-13 05:02:15,665 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:15,665 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:15,666 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:15,666 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:15,666 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:15,682 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 05:02:15,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1848617483] [2020-10-13 05:02:15,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 05:02:15,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-13 05:02:15,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427047408] [2020-10-13 05:02:15,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-13 05:02:15,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:15,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-13 05:02:15,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-13 05:02:15,713 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 3 states. [2020-10-13 05:02:15,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:15,789 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-10-13 05:02:15,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-13 05:02:15,791 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-10-13 05:02:15,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:15,800 INFO L225 Difference]: With dead ends: 41 [2020-10-13 05:02:15,801 INFO L226 Difference]: Without dead ends: 19 [2020-10-13 05:02:15,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-13 05:02:15,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-10-13 05:02:15,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-10-13 05:02:15,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-10-13 05:02:15,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-10-13 05:02:15,845 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2020-10-13 05:02:15,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:15,846 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-10-13 05:02:15,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-13 05:02:15,846 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-10-13 05:02:15,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-13 05:02:15,847 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:15,847 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:15,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-13 05:02:15,848 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:15,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:15,849 INFO L82 PathProgramCache]: Analyzing trace with hash 905206694, now seen corresponding path program 1 times [2020-10-13 05:02:15,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:15,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [846285] [2020-10-13 05:02:15,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:15,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:15,872 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:15,894 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:16,040 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:16,041 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-13 05:02:16,041 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:02:16,041 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 176 [2020-10-13 05:02:16,042 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:16,042 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 05:02:16,043 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:02:16,043 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 05:02:16,043 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:16,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:16,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:16,093 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:16,096 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:16,096 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:16,096 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:16,097 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-13 05:02:16,097 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:16,097 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:16,097 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:16,097 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:16,098 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:16,101 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 05:02:16,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [846285] [2020-10-13 05:02:16,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 05:02:16,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-13 05:02:16,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431899200] [2020-10-13 05:02:16,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-13 05:02:16,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:16,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-13 05:02:16,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 05:02:16,105 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2020-10-13 05:02:16,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:16,163 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-10-13 05:02:16,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-13 05:02:16,164 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-10-13 05:02:16,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:16,165 INFO L225 Difference]: With dead ends: 32 [2020-10-13 05:02:16,165 INFO L226 Difference]: Without dead ends: 20 [2020-10-13 05:02:16,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 05:02:16,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-10-13 05:02:16,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-10-13 05:02:16,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-10-13 05:02:16,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-10-13 05:02:16,173 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2020-10-13 05:02:16,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:16,174 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-10-13 05:02:16,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-13 05:02:16,174 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-10-13 05:02:16,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-13 05:02:16,175 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:16,175 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:16,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-13 05:02:16,176 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:16,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:16,176 INFO L82 PathProgramCache]: Analyzing trace with hash -764882998, now seen corresponding path program 1 times [2020-10-13 05:02:16,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:16,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1879484063] [2020-10-13 05:02:16,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:16,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:16,195 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:16,211 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:16,344 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:16,344 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-10-13 05:02:16,344 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:02:16,345 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 154 [2020-10-13 05:02:16,345 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:16,345 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 05:02:16,345 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-10-13 05:02:16,346 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 05:02:16,346 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:16,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:16,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:16,392 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:16,394 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:16,394 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:16,395 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:16,395 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-13 05:02:16,396 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:16,396 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:16,396 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:16,396 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:16,396 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:16,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-13 05:02:16,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1879484063] [2020-10-13 05:02:16,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 05:02:16,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-13 05:02:16,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593694570] [2020-10-13 05:02:16,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-13 05:02:16,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:16,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-13 05:02:16,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 05:02:16,404 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 4 states. [2020-10-13 05:02:16,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:16,496 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2020-10-13 05:02:16,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-13 05:02:16,497 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-10-13 05:02:16,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:16,500 INFO L225 Difference]: With dead ends: 34 [2020-10-13 05:02:16,501 INFO L226 Difference]: Without dead ends: 24 [2020-10-13 05:02:16,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 05:02:16,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-13 05:02:16,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2020-10-13 05:02:16,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-10-13 05:02:16,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-10-13 05:02:16,534 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2020-10-13 05:02:16,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:16,535 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-10-13 05:02:16,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-13 05:02:16,535 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-10-13 05:02:16,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-13 05:02:16,536 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:16,536 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:16,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-13 05:02:16,537 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:16,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:16,537 INFO L82 PathProgramCache]: Analyzing trace with hash -59429947, now seen corresponding path program 1 times [2020-10-13 05:02:16,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:16,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1184296665] [2020-10-13 05:02:16,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:16,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:16,553 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:16,565 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:16,654 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:16,965 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:16,965 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-10-13 05:02:16,965 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:16,965 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 416 [2020-10-13 05:02:16,966 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:16,966 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-13 05:02:16,966 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:02:16,966 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 3 [2020-10-13 05:02:16,966 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:17,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:17,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:17,017 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:17,021 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:17,021 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:17,022 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:17,022 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-13 05:02:17,022 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:17,022 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:17,023 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:17,023 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:17,025 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-13 05:02:17,030 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-13 05:02:17,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1184296665] [2020-10-13 05:02:17,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:17,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 05:02:17,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33617552] [2020-10-13 05:02:17,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 05:02:17,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:17,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 05:02:17,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 05:02:17,033 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 5 states. [2020-10-13 05:02:17,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:17,103 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-10-13 05:02:17,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 05:02:17,104 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-10-13 05:02:17,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:17,105 INFO L225 Difference]: With dead ends: 38 [2020-10-13 05:02:17,105 INFO L226 Difference]: Without dead ends: 25 [2020-10-13 05:02:17,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 05:02:17,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-10-13 05:02:17,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-10-13 05:02:17,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-10-13 05:02:17,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-10-13 05:02:17,112 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2020-10-13 05:02:17,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:17,112 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-10-13 05:02:17,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 05:02:17,112 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-10-13 05:02:17,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-13 05:02:17,113 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:17,113 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:17,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-13 05:02:17,114 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:17,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:17,114 INFO L82 PathProgramCache]: Analyzing trace with hash 1302144745, now seen corresponding path program 2 times [2020-10-13 05:02:17,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:17,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1783280747] [2020-10-13 05:02:17,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:17,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:17,127 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:17,144 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:17,236 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:17,483 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:17,483 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 26 [2020-10-13 05:02:17,483 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:17,484 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 359 [2020-10-13 05:02:17,484 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:17,484 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-13 05:02:17,485 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-13 05:02:17,485 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 3 [2020-10-13 05:02:17,485 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:17,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:17,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:17,523 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:17,524 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:17,525 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:17,525 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:17,525 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:02:17,525 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:17,525 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:17,526 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:17,526 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:17,526 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:17,528 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-10-13 05:02:17,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1783280747] [2020-10-13 05:02:17,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:17,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 05:02:17,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429812274] [2020-10-13 05:02:17,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 05:02:17,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:17,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 05:02:17,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 05:02:17,531 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 5 states. [2020-10-13 05:02:17,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:17,606 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-10-13 05:02:17,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 05:02:17,607 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2020-10-13 05:02:17,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:17,608 INFO L225 Difference]: With dead ends: 39 [2020-10-13 05:02:17,608 INFO L226 Difference]: Without dead ends: 29 [2020-10-13 05:02:17,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 05:02:17,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-10-13 05:02:17,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 23. [2020-10-13 05:02:17,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-13 05:02:17,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-10-13 05:02:17,615 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 18 [2020-10-13 05:02:17,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:17,615 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-10-13 05:02:17,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 05:02:17,616 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-10-13 05:02:17,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-13 05:02:17,616 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:17,617 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:17,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-13 05:02:17,617 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:17,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:17,618 INFO L82 PathProgramCache]: Analyzing trace with hash -406079354, now seen corresponding path program 3 times [2020-10-13 05:02:17,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:17,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2093010142] [2020-10-13 05:02:17,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:17,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:17,628 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:17,641 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:17,801 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:17,951 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:17,952 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-10-13 05:02:17,952 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:17,952 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 325 [2020-10-13 05:02:17,952 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:17,953 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 05:02:17,953 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-13 05:02:17,953 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-13 05:02:17,953 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:17,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:17,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:17,990 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:17,992 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:17,992 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:17,992 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:17,993 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:02:17,993 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:17,993 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:17,993 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:17,993 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:17,994 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:17,996 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-10-13 05:02:17,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2093010142] [2020-10-13 05:02:17,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:17,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-13 05:02:17,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399913985] [2020-10-13 05:02:17,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-13 05:02:17,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:17,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-13 05:02:17,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-13 05:02:17,999 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 6 states. [2020-10-13 05:02:18,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:18,095 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-10-13 05:02:18,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-13 05:02:18,095 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-10-13 05:02:18,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:18,096 INFO L225 Difference]: With dead ends: 48 [2020-10-13 05:02:18,097 INFO L226 Difference]: Without dead ends: 34 [2020-10-13 05:02:18,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-13 05:02:18,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-13 05:02:18,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2020-10-13 05:02:18,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-10-13 05:02:18,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-10-13 05:02:18,104 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 19 [2020-10-13 05:02:18,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:18,104 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-10-13 05:02:18,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-13 05:02:18,104 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-10-13 05:02:18,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-13 05:02:18,105 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:18,105 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:18,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-13 05:02:18,106 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:18,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:18,106 INFO L82 PathProgramCache]: Analyzing trace with hash -820912923, now seen corresponding path program 4 times [2020-10-13 05:02:18,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:18,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1963548579] [2020-10-13 05:02:18,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:18,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:18,118 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:18,135 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:18,353 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:18,689 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:18,689 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 29 [2020-10-13 05:02:18,690 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:18,690 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 574 [2020-10-13 05:02:18,690 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:18,690 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-13 05:02:18,691 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:02:18,691 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-13 05:02:18,691 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:18,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:18,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:18,739 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:18,740 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:18,740 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:18,740 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:18,741 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:18,741 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:18,741 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:18,741 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:18,742 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:18,742 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:18,744 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-10-13 05:02:18,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1963548579] [2020-10-13 05:02:18,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:18,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-13 05:02:18,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104114727] [2020-10-13 05:02:18,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-13 05:02:18,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:18,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-13 05:02:18,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-13 05:02:18,746 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 7 states. [2020-10-13 05:02:18,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:18,843 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-10-13 05:02:18,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-13 05:02:18,844 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-10-13 05:02:18,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:18,845 INFO L225 Difference]: With dead ends: 44 [2020-10-13 05:02:18,845 INFO L226 Difference]: Without dead ends: 29 [2020-10-13 05:02:18,846 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-13 05:02:18,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-10-13 05:02:18,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-10-13 05:02:18,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-13 05:02:18,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-10-13 05:02:18,851 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2020-10-13 05:02:18,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:18,852 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-10-13 05:02:18,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-13 05:02:18,852 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-10-13 05:02:18,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-13 05:02:18,853 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:18,853 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:18,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-13 05:02:18,854 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:18,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:18,854 INFO L82 PathProgramCache]: Analyzing trace with hash 130000393, now seen corresponding path program 5 times [2020-10-13 05:02:18,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:18,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1865952003] [2020-10-13 05:02:18,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:18,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:18,872 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:18,890 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:19,148 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:19,728 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:19,729 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 30 [2020-10-13 05:02:19,729 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:19,730 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 862 [2020-10-13 05:02:19,730 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:19,730 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-13 05:02:19,731 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 17 [2020-10-13 05:02:19,731 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-13 05:02:19,731 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:19,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:19,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:19,798 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:19,800 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:19,800 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:19,801 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:19,801 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:02:19,801 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:19,802 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:19,802 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:19,802 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:19,803 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:19,806 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-10-13 05:02:19,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1865952003] [2020-10-13 05:02:19,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:19,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-13 05:02:19,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000992957] [2020-10-13 05:02:19,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-13 05:02:19,807 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:19,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-13 05:02:19,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-13 05:02:19,808 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 7 states. [2020-10-13 05:02:19,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:19,966 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-10-13 05:02:19,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-13 05:02:19,968 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-10-13 05:02:19,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:19,969 INFO L225 Difference]: With dead ends: 49 [2020-10-13 05:02:19,969 INFO L226 Difference]: Without dead ends: 39 [2020-10-13 05:02:19,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-13 05:02:19,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-10-13 05:02:19,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 27. [2020-10-13 05:02:19,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-10-13 05:02:19,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-10-13 05:02:19,976 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 22 [2020-10-13 05:02:19,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:19,977 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-10-13 05:02:19,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-13 05:02:19,977 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-10-13 05:02:19,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-13 05:02:19,978 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:19,978 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:19,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-13 05:02:19,979 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:19,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:19,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1912151398, now seen corresponding path program 6 times [2020-10-13 05:02:19,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:19,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1433626784] [2020-10-13 05:02:19,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:19,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:20,001 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:20,031 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:20,492 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:21,364 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:21,365 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 31 [2020-10-13 05:02:21,365 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:21,366 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1371 [2020-10-13 05:02:21,366 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:21,366 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 05:02:21,366 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:02:21,367 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-13 05:02:21,367 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:21,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:21,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:21,438 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:21,439 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:21,439 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:21,440 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:21,440 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:21,440 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:21,440 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:21,441 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:21,441 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:21,441 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:21,443 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-10-13 05:02:21,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1433626784] [2020-10-13 05:02:21,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:21,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-13 05:02:21,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507751971] [2020-10-13 05:02:21,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-13 05:02:21,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:21,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-13 05:02:21,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 05:02:21,446 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 8 states. [2020-10-13 05:02:21,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:21,543 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2020-10-13 05:02:21,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-13 05:02:21,544 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-10-13 05:02:21,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:21,545 INFO L225 Difference]: With dead ends: 47 [2020-10-13 05:02:21,545 INFO L226 Difference]: Without dead ends: 31 [2020-10-13 05:02:21,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 05:02:21,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-10-13 05:02:21,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-10-13 05:02:21,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-10-13 05:02:21,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-10-13 05:02:21,551 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2020-10-13 05:02:21,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:21,551 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-10-13 05:02:21,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-13 05:02:21,552 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-10-13 05:02:21,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-13 05:02:21,552 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:21,552 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:21,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-13 05:02:21,553 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:21,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:21,554 INFO L82 PathProgramCache]: Analyzing trace with hash 911814026, now seen corresponding path program 7 times [2020-10-13 05:02:21,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:21,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718205978] [2020-10-13 05:02:21,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:21,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:21,575 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:21,603 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:22,043 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:22,816 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:22,817 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 32 [2020-10-13 05:02:22,817 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:22,817 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1247 [2020-10-13 05:02:22,817 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:22,818 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 05:02:22,818 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 18 [2020-10-13 05:02:22,818 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-13 05:02:22,818 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:22,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:22,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:22,874 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:22,875 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:22,875 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:22,875 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:22,876 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:22,876 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:22,876 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:22,876 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:22,877 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:22,877 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:22,879 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-13 05:02:22,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718205978] [2020-10-13 05:02:22,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:22,880 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-13 05:02:22,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724680001] [2020-10-13 05:02:22,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-13 05:02:22,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:22,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-13 05:02:22,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 05:02:22,882 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-10-13 05:02:23,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:23,064 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-10-13 05:02:23,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-13 05:02:23,065 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-10-13 05:02:23,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:23,066 INFO L225 Difference]: With dead ends: 54 [2020-10-13 05:02:23,066 INFO L226 Difference]: Without dead ends: 44 [2020-10-13 05:02:23,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 05:02:23,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-10-13 05:02:23,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 29. [2020-10-13 05:02:23,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-10-13 05:02:23,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-10-13 05:02:23,073 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 24 [2020-10-13 05:02:23,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:23,073 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-10-13 05:02:23,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-13 05:02:23,074 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-10-13 05:02:23,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-13 05:02:23,074 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:23,075 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:23,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-13 05:02:23,075 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:23,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:23,075 INFO L82 PathProgramCache]: Analyzing trace with hash 378570245, now seen corresponding path program 8 times [2020-10-13 05:02:23,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:23,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [361218582] [2020-10-13 05:02:23,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:23,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:23,099 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:23,134 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:23,714 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:24,474 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:24,475 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 33 [2020-10-13 05:02:24,475 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:24,475 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1384 [2020-10-13 05:02:24,475 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:24,476 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-10-13 05:02:24,476 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 18 [2020-10-13 05:02:24,476 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-13 05:02:24,476 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:24,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:24,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:24,555 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:24,562 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:24,562 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:24,563 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:24,563 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-10-13 05:02:24,564 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:24,564 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:24,564 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:24,565 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:24,565 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:24,569 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-13 05:02:24,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [361218582] [2020-10-13 05:02:24,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:24,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-10-13 05:02:24,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937477233] [2020-10-13 05:02:24,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-13 05:02:24,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:24,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-13 05:02:24,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-10-13 05:02:24,574 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 9 states. [2020-10-13 05:02:24,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:24,801 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2020-10-13 05:02:24,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-13 05:02:24,802 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-10-13 05:02:24,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:24,804 INFO L225 Difference]: With dead ends: 66 [2020-10-13 05:02:24,804 INFO L226 Difference]: Without dead ends: 49 [2020-10-13 05:02:24,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-10-13 05:02:24,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-10-13 05:02:24,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 31. [2020-10-13 05:02:24,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-13 05:02:24,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2020-10-13 05:02:24,819 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 25 [2020-10-13 05:02:24,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:24,820 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2020-10-13 05:02:24,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-13 05:02:24,821 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2020-10-13 05:02:24,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-13 05:02:24,825 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:24,826 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:24,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-13 05:02:24,827 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:24,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:24,827 INFO L82 PathProgramCache]: Analyzing trace with hash -1539667386, now seen corresponding path program 9 times [2020-10-13 05:02:24,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:24,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276395081] [2020-10-13 05:02:24,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:24,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:24,860 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:24,911 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:25,810 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:27,163 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:27,163 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 35 [2020-10-13 05:02:27,163 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:27,163 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2313 [2020-10-13 05:02:27,164 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:27,164 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-13 05:02:27,164 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 19 [2020-10-13 05:02:27,164 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-13 05:02:27,164 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:27,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:27,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:27,256 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:27,257 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:27,257 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:27,257 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:27,257 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:27,258 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:27,258 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:27,258 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:27,258 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:27,258 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:27,261 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-10-13 05:02:27,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1276395081] [2020-10-13 05:02:27,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:27,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-13 05:02:27,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058075649] [2020-10-13 05:02:27,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-13 05:02:27,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:27,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-13 05:02:27,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-10-13 05:02:27,263 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 10 states. [2020-10-13 05:02:27,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:27,445 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2020-10-13 05:02:27,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-13 05:02:27,445 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-10-13 05:02:27,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:27,446 INFO L225 Difference]: With dead ends: 72 [2020-10-13 05:02:27,446 INFO L226 Difference]: Without dead ends: 54 [2020-10-13 05:02:27,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-10-13 05:02:27,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-10-13 05:02:27,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 33. [2020-10-13 05:02:27,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-10-13 05:02:27,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-10-13 05:02:27,457 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 27 [2020-10-13 05:02:27,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:27,458 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-10-13 05:02:27,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-13 05:02:27,458 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-10-13 05:02:27,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-13 05:02:27,461 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:27,461 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:27,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-10-13 05:02:27,462 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:27,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:27,462 INFO L82 PathProgramCache]: Analyzing trace with hash -411883739, now seen corresponding path program 10 times [2020-10-13 05:02:27,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:27,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [830900231] [2020-10-13 05:02:27,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:27,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:27,489 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:27,522 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:28,401 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:29,947 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:29,948 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 37 [2020-10-13 05:02:29,948 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:29,948 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2466 [2020-10-13 05:02:29,949 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:29,949 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-13 05:02:29,949 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 20 [2020-10-13 05:02:29,949 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-10-13 05:02:29,950 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:30,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:30,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:30,045 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:30,046 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:30,046 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:30,047 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:30,047 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:30,047 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:30,047 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:30,048 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:30,048 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:30,048 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:30,051 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-10-13 05:02:30,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [830900231] [2020-10-13 05:02:30,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:30,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-13 05:02:30,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033451838] [2020-10-13 05:02:30,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-13 05:02:30,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:30,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-13 05:02:30,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-10-13 05:02:30,055 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 11 states. [2020-10-13 05:02:30,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:30,247 INFO L93 Difference]: Finished difference Result 78 states and 91 transitions. [2020-10-13 05:02:30,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-13 05:02:30,248 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-10-13 05:02:30,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:30,250 INFO L225 Difference]: With dead ends: 78 [2020-10-13 05:02:30,250 INFO L226 Difference]: Without dead ends: 59 [2020-10-13 05:02:30,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-10-13 05:02:30,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-10-13 05:02:30,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 35. [2020-10-13 05:02:30,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-13 05:02:30,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-10-13 05:02:30,260 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 29 [2020-10-13 05:02:30,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:30,260 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-10-13 05:02:30,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-13 05:02:30,260 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-10-13 05:02:30,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-10-13 05:02:30,261 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:30,262 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:30,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-10-13 05:02:30,262 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:30,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:30,262 INFO L82 PathProgramCache]: Analyzing trace with hash -959578330, now seen corresponding path program 11 times [2020-10-13 05:02:30,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:30,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204057082] [2020-10-13 05:02:30,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:30,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:30,284 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:30,318 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:31,354 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:33,279 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:33,279 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 39 [2020-10-13 05:02:33,279 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:33,280 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3001 [2020-10-13 05:02:33,280 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:33,280 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-13 05:02:33,280 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:02:33,280 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-13 05:02:33,281 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:33,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:33,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:33,387 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:33,388 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:33,388 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:33,389 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:33,389 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:33,389 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:33,389 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:33,389 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:33,390 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:33,390 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:33,392 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-10-13 05:02:33,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1204057082] [2020-10-13 05:02:33,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:33,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-13 05:02:33,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956413241] [2020-10-13 05:02:33,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-13 05:02:33,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:33,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-13 05:02:33,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-10-13 05:02:33,395 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 12 states. [2020-10-13 05:02:33,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:33,512 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2020-10-13 05:02:33,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-13 05:02:33,513 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-10-13 05:02:33,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:33,513 INFO L225 Difference]: With dead ends: 62 [2020-10-13 05:02:33,514 INFO L226 Difference]: Without dead ends: 42 [2020-10-13 05:02:33,514 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-10-13 05:02:33,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-10-13 05:02:33,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 36. [2020-10-13 05:02:33,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-10-13 05:02:33,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-10-13 05:02:33,521 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2020-10-13 05:02:33,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:33,523 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-10-13 05:02:33,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-13 05:02:33,524 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-10-13 05:02:33,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-13 05:02:33,524 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:33,524 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:33,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-10-13 05:02:33,525 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:33,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:33,525 INFO L82 PathProgramCache]: Analyzing trace with hash 1270721354, now seen corresponding path program 12 times [2020-10-13 05:02:33,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:33,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142940620] [2020-10-13 05:02:33,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:33,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:33,544 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:33,592 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:34,602 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:36,121 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:36,122 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-13 05:02:36,122 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:36,122 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2583 [2020-10-13 05:02:36,122 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:36,122 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-13 05:02:36,123 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 22 [2020-10-13 05:02:36,123 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-13 05:02:36,123 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:36,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:36,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:36,214 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:36,215 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:36,216 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:36,216 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:36,216 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:36,216 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:36,216 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:36,217 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:36,217 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:36,217 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:36,219 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-10-13 05:02:36,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142940620] [2020-10-13 05:02:36,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:36,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-13 05:02:36,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726250124] [2020-10-13 05:02:36,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-13 05:02:36,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:36,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-13 05:02:36,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-10-13 05:02:36,222 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 12 states. [2020-10-13 05:02:36,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:36,409 INFO L93 Difference]: Finished difference Result 74 states and 86 transitions. [2020-10-13 05:02:36,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-13 05:02:36,410 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-10-13 05:02:36,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:36,411 INFO L225 Difference]: With dead ends: 74 [2020-10-13 05:02:36,411 INFO L226 Difference]: Without dead ends: 64 [2020-10-13 05:02:36,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-10-13 05:02:36,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-10-13 05:02:36,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 37. [2020-10-13 05:02:36,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-10-13 05:02:36,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-10-13 05:02:36,418 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 32 [2020-10-13 05:02:36,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:36,418 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-10-13 05:02:36,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-13 05:02:36,418 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-10-13 05:02:36,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-13 05:02:36,419 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:36,419 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:36,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-10-13 05:02:36,420 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:36,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:36,420 INFO L82 PathProgramCache]: Analyzing trace with hash -1380204475, now seen corresponding path program 13 times [2020-10-13 05:02:36,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:36,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [700914150] [2020-10-13 05:02:36,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:36,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:36,442 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:36,481 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:37,564 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:38,872 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:38,872 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 41 [2020-10-13 05:02:38,873 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:38,873 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2438 [2020-10-13 05:02:38,873 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:38,873 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 11 [2020-10-13 05:02:38,873 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 22 [2020-10-13 05:02:38,873 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-10-13 05:02:38,873 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:38,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:38,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:38,987 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:38,988 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:38,989 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:38,989 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:38,989 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:02:38,989 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:38,990 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:38,990 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:38,990 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:38,990 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:38,994 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-10-13 05:02:38,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [700914150] [2020-10-13 05:02:38,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:38,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-10-13 05:02:38,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495315498] [2020-10-13 05:02:38,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-13 05:02:38,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:38,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-13 05:02:38,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-10-13 05:02:38,996 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 13 states. [2020-10-13 05:02:39,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:39,217 INFO L93 Difference]: Finished difference Result 90 states and 105 transitions. [2020-10-13 05:02:39,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-13 05:02:39,217 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-10-13 05:02:39,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:39,218 INFO L225 Difference]: With dead ends: 90 [2020-10-13 05:02:39,218 INFO L226 Difference]: Without dead ends: 69 [2020-10-13 05:02:39,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-10-13 05:02:39,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-10-13 05:02:39,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 39. [2020-10-13 05:02:39,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-10-13 05:02:39,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-10-13 05:02:39,225 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 33 [2020-10-13 05:02:39,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:39,225 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-10-13 05:02:39,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-13 05:02:39,226 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-10-13 05:02:39,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-10-13 05:02:39,226 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:39,226 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:39,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-10-13 05:02:39,227 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:39,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:39,227 INFO L82 PathProgramCache]: Analyzing trace with hash 2054257670, now seen corresponding path program 14 times [2020-10-13 05:02:39,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:39,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273234651] [2020-10-13 05:02:39,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:39,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:39,249 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:39,294 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:40,333 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:41,979 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:41,979 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 43 [2020-10-13 05:02:41,979 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:41,979 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2738 [2020-10-13 05:02:41,980 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:41,980 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-10-13 05:02:41,980 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:02:41,980 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-10-13 05:02:41,980 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:42,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:42,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:42,114 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:42,115 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:42,116 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:42,116 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:42,116 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:42,116 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:42,116 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:42,117 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:42,117 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:42,117 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:42,119 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-10-13 05:02:42,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273234651] [2020-10-13 05:02:42,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:42,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-10-13 05:02:42,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106777701] [2020-10-13 05:02:42,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-13 05:02:42,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:42,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-13 05:02:42,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-10-13 05:02:42,122 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 14 states. [2020-10-13 05:02:42,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:42,201 INFO L93 Difference]: Finished difference Result 68 states and 74 transitions. [2020-10-13 05:02:42,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-13 05:02:42,202 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-10-13 05:02:42,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:42,202 INFO L225 Difference]: With dead ends: 68 [2020-10-13 05:02:42,203 INFO L226 Difference]: Without dead ends: 46 [2020-10-13 05:02:42,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-10-13 05:02:42,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-10-13 05:02:42,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2020-10-13 05:02:42,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-10-13 05:02:42,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-10-13 05:02:42,207 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2020-10-13 05:02:42,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:42,207 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-10-13 05:02:42,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-13 05:02:42,208 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-10-13 05:02:42,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-10-13 05:02:42,208 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:42,208 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:42,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-10-13 05:02:42,209 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:42,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:42,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1772516906, now seen corresponding path program 15 times [2020-10-13 05:02:42,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:42,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [734347015] [2020-10-13 05:02:42,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:42,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:42,227 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:42,265 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:43,458 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:45,734 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:45,734 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-10-13 05:02:45,735 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:45,735 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3513 [2020-10-13 05:02:45,735 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:45,735 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-10-13 05:02:45,735 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 24 [2020-10-13 05:02:45,736 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-10-13 05:02:45,736 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:45,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:45,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:45,857 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:45,858 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:45,858 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:45,858 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:45,859 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:45,859 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:45,859 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:45,859 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:45,859 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:45,859 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:45,861 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-10-13 05:02:45,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [734347015] [2020-10-13 05:02:45,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:45,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-10-13 05:02:45,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065702190] [2020-10-13 05:02:45,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-13 05:02:45,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:45,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-13 05:02:45,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-10-13 05:02:45,864 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 14 states. [2020-10-13 05:02:46,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:46,148 INFO L93 Difference]: Finished difference Result 84 states and 98 transitions. [2020-10-13 05:02:46,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-13 05:02:46,149 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-10-13 05:02:46,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:46,150 INFO L225 Difference]: With dead ends: 84 [2020-10-13 05:02:46,150 INFO L226 Difference]: Without dead ends: 74 [2020-10-13 05:02:46,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-10-13 05:02:46,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-10-13 05:02:46,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 41. [2020-10-13 05:02:46,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-13 05:02:46,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2020-10-13 05:02:46,157 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 36 [2020-10-13 05:02:46,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:46,158 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2020-10-13 05:02:46,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-13 05:02:46,158 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2020-10-13 05:02:46,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-10-13 05:02:46,158 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:46,158 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:46,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-10-13 05:02:46,159 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:46,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:46,159 INFO L82 PathProgramCache]: Analyzing trace with hash 1290555749, now seen corresponding path program 16 times [2020-10-13 05:02:46,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:46,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1752905626] [2020-10-13 05:02:46,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:46,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:46,177 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:46,223 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:47,423 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:49,385 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:49,386 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 45 [2020-10-13 05:02:49,386 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:49,386 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3214 [2020-10-13 05:02:49,386 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:49,386 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 13 [2020-10-13 05:02:49,387 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 24 [2020-10-13 05:02:49,387 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 13 [2020-10-13 05:02:49,387 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:49,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:49,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:49,566 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:49,567 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:49,568 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:49,568 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:49,568 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:49,568 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:49,569 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:49,569 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:49,569 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:49,570 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:49,574 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-10-13 05:02:49,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1752905626] [2020-10-13 05:02:49,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:49,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-10-13 05:02:49,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525360051] [2020-10-13 05:02:49,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-13 05:02:49,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:49,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-13 05:02:49,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-10-13 05:02:49,576 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 15 states. [2020-10-13 05:02:49,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:49,827 INFO L93 Difference]: Finished difference Result 102 states and 119 transitions. [2020-10-13 05:02:49,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-10-13 05:02:49,828 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-10-13 05:02:49,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:49,829 INFO L225 Difference]: With dead ends: 102 [2020-10-13 05:02:49,830 INFO L226 Difference]: Without dead ends: 79 [2020-10-13 05:02:49,830 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-10-13 05:02:49,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-10-13 05:02:49,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 43. [2020-10-13 05:02:49,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-10-13 05:02:49,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2020-10-13 05:02:49,837 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 37 [2020-10-13 05:02:49,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:49,838 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2020-10-13 05:02:49,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-13 05:02:49,838 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2020-10-13 05:02:49,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-10-13 05:02:49,838 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:49,838 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:49,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-10-13 05:02:49,839 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:49,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:49,839 INFO L82 PathProgramCache]: Analyzing trace with hash -1738342170, now seen corresponding path program 17 times [2020-10-13 05:02:49,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:49,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911625939] [2020-10-13 05:02:49,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:49,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:49,856 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:49,909 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:51,998 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:54,118 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:54,118 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 47 [2020-10-13 05:02:54,118 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:54,118 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4267 [2020-10-13 05:02:54,118 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:54,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 14 [2020-10-13 05:02:54,119 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 25 [2020-10-13 05:02:54,119 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 14 [2020-10-13 05:02:54,119 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:54,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:54,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:54,286 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:54,287 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:54,287 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:54,287 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:54,287 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:54,287 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:54,288 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:54,288 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:54,288 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:54,288 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:54,290 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-10-13 05:02:54,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911625939] [2020-10-13 05:02:54,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:54,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-10-13 05:02:54,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568069011] [2020-10-13 05:02:54,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-10-13 05:02:54,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:54,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-10-13 05:02:54,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-10-13 05:02:54,292 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 16 states. [2020-10-13 05:02:54,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:54,541 INFO L93 Difference]: Finished difference Result 108 states and 126 transitions. [2020-10-13 05:02:54,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-13 05:02:54,542 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-10-13 05:02:54,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:54,543 INFO L225 Difference]: With dead ends: 108 [2020-10-13 05:02:54,544 INFO L226 Difference]: Without dead ends: 84 [2020-10-13 05:02:54,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-10-13 05:02:54,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-10-13 05:02:54,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 45. [2020-10-13 05:02:54,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-10-13 05:02:54,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2020-10-13 05:02:54,551 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 39 [2020-10-13 05:02:54,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:54,551 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2020-10-13 05:02:54,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-10-13 05:02:54,551 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2020-10-13 05:02:54,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-10-13 05:02:54,552 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:54,552 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:54,552 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-10-13 05:02:54,552 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:54,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:54,553 INFO L82 PathProgramCache]: Analyzing trace with hash 1074190981, now seen corresponding path program 18 times [2020-10-13 05:02:54,553 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:54,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404679037] [2020-10-13 05:02:54,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:54,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:54,569 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:54,607 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:56,584 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:59,104 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:59,105 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 49 [2020-10-13 05:02:59,105 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:59,105 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4539 [2020-10-13 05:02:59,105 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:59,105 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 15 [2020-10-13 05:02:59,105 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 26 [2020-10-13 05:02:59,105 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-10-13 05:02:59,105 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:59,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:59,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:59,270 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:59,271 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:59,271 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:59,271 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:59,272 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:59,272 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:59,272 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:59,272 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:59,272 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:59,272 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:59,275 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-10-13 05:02:59,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404679037] [2020-10-13 05:02:59,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:59,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-10-13 05:02:59,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431520145] [2020-10-13 05:02:59,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-13 05:02:59,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:59,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-13 05:02:59,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-10-13 05:02:59,277 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 17 states. [2020-10-13 05:02:59,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:59,595 INFO L93 Difference]: Finished difference Result 114 states and 133 transitions. [2020-10-13 05:02:59,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-10-13 05:02:59,596 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-10-13 05:02:59,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:59,597 INFO L225 Difference]: With dead ends: 114 [2020-10-13 05:02:59,597 INFO L226 Difference]: Without dead ends: 89 [2020-10-13 05:02:59,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-10-13 05:02:59,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-10-13 05:02:59,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 47. [2020-10-13 05:02:59,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-10-13 05:02:59,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2020-10-13 05:02:59,605 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 41 [2020-10-13 05:02:59,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:59,605 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2020-10-13 05:02:59,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-13 05:02:59,605 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2020-10-13 05:02:59,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-10-13 05:02:59,606 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:59,606 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:59,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-10-13 05:02:59,606 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:59,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:59,606 INFO L82 PathProgramCache]: Analyzing trace with hash 308317638, now seen corresponding path program 19 times [2020-10-13 05:02:59,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:59,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [644045996] [2020-10-13 05:02:59,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:59,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:59,622 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:59,670 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:02,163 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:04,618 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:04,618 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 51 [2020-10-13 05:03:04,618 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:03:04,618 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5000 [2020-10-13 05:03:04,618 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:04,619 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 16 [2020-10-13 05:03:04,619 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 27 [2020-10-13 05:03:04,619 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-13 05:03:04,619 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:04,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:04,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:04,791 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:04,792 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:04,792 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:04,792 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:04,792 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:04,793 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:04,793 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:04,793 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:04,793 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:04,793 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:04,797 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-10-13 05:03:04,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [644045996] [2020-10-13 05:03:04,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:04,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-10-13 05:03:04,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183242884] [2020-10-13 05:03:04,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-10-13 05:03:04,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:04,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-10-13 05:03:04,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-10-13 05:03:04,802 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 18 states. [2020-10-13 05:03:05,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:05,127 INFO L93 Difference]: Finished difference Result 120 states and 140 transitions. [2020-10-13 05:03:05,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-10-13 05:03:05,131 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-10-13 05:03:05,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:05,132 INFO L225 Difference]: With dead ends: 120 [2020-10-13 05:03:05,133 INFO L226 Difference]: Without dead ends: 94 [2020-10-13 05:03:05,133 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-10-13 05:03:05,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-10-13 05:03:05,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 49. [2020-10-13 05:03:05,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-10-13 05:03:05,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2020-10-13 05:03:05,143 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 43 [2020-10-13 05:03:05,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:05,144 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2020-10-13 05:03:05,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-10-13 05:03:05,144 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2020-10-13 05:03:05,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-13 05:03:05,144 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:05,145 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:05,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-10-13 05:03:05,145 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:05,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:05,145 INFO L82 PathProgramCache]: Analyzing trace with hash -1181918299, now seen corresponding path program 20 times [2020-10-13 05:03:05,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:05,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [561148771] [2020-10-13 05:03:05,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:05,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:05,163 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:05,220 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:07,939 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:10,159 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:10,159 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 53 [2020-10-13 05:03:10,159 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:03:10,159 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5002 [2020-10-13 05:03:10,160 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:10,160 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 17 [2020-10-13 05:03:10,160 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:03:10,160 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 17 [2020-10-13 05:03:10,160 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:10,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:10,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:10,353 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:10,354 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:10,355 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:10,355 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:10,355 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:10,355 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:10,355 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:10,355 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:10,355 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:10,355 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:10,357 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-10-13 05:03:10,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [561148771] [2020-10-13 05:03:10,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:10,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-10-13 05:03:10,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362403632] [2020-10-13 05:03:10,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-10-13 05:03:10,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:10,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-10-13 05:03:10,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-10-13 05:03:10,360 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 19 states. [2020-10-13 05:03:10,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:10,507 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2020-10-13 05:03:10,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-10-13 05:03:10,507 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-10-13 05:03:10,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:10,509 INFO L225 Difference]: With dead ends: 86 [2020-10-13 05:03:10,509 INFO L226 Difference]: Without dead ends: 59 [2020-10-13 05:03:10,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-10-13 05:03:10,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-10-13 05:03:10,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 50. [2020-10-13 05:03:10,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-10-13 05:03:10,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-10-13 05:03:10,514 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 45 [2020-10-13 05:03:10,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:10,514 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-10-13 05:03:10,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-10-13 05:03:10,515 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-10-13 05:03:10,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-10-13 05:03:10,515 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:10,515 INFO L422 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:10,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-10-13 05:03:10,516 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:10,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:10,516 INFO L82 PathProgramCache]: Analyzing trace with hash 2121988297, now seen corresponding path program 21 times [2020-10-13 05:03:10,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:10,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1725484020] [2020-10-13 05:03:10,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:10,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:10,531 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:10,588 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:14,253 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:15,532 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:15,533 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 54 [2020-10-13 05:03:15,533 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:03:15,533 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5005 [2020-10-13 05:03:15,533 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:15,533 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 17 [2020-10-13 05:03:15,533 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 29 [2020-10-13 05:03:15,533 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 17 [2020-10-13 05:03:15,533 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:15,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:15,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:15,760 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:15,761 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:15,761 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:15,761 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:15,761 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:15,762 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:15,762 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:15,762 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:15,762 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:15,762 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:15,765 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-10-13 05:03:15,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1725484020] [2020-10-13 05:03:15,765 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:15,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-10-13 05:03:15,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685579495] [2020-10-13 05:03:15,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-10-13 05:03:15,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:15,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-10-13 05:03:15,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-10-13 05:03:15,767 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 19 states. [2020-10-13 05:03:16,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:16,136 INFO L93 Difference]: Finished difference Result 109 states and 128 transitions. [2020-10-13 05:03:16,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-10-13 05:03:16,136 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 46 [2020-10-13 05:03:16,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:16,138 INFO L225 Difference]: With dead ends: 109 [2020-10-13 05:03:16,138 INFO L226 Difference]: Without dead ends: 99 [2020-10-13 05:03:16,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-10-13 05:03:16,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-10-13 05:03:16,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 51. [2020-10-13 05:03:16,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-10-13 05:03:16,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2020-10-13 05:03:16,146 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 46 [2020-10-13 05:03:16,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:16,147 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2020-10-13 05:03:16,147 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-10-13 05:03:16,147 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2020-10-13 05:03:16,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-10-13 05:03:16,147 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:16,147 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:16,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-10-13 05:03:16,148 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:16,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:16,148 INFO L82 PathProgramCache]: Analyzing trace with hash -760733018, now seen corresponding path program 22 times [2020-10-13 05:03:16,148 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:16,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2131250842] [2020-10-13 05:03:16,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:16,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:16,163 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:16,220 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:19,451 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:21,166 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:21,167 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 55 [2020-10-13 05:03:21,167 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:03:21,167 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5007 [2020-10-13 05:03:21,167 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:21,167 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 18 [2020-10-13 05:03:21,167 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:03:21,167 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-10-13 05:03:21,168 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:21,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:21,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:21,434 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:21,436 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:21,436 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:21,436 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:21,437 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:03:21,437 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:21,437 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:21,437 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:21,438 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:21,438 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:03:21,442 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-10-13 05:03:21,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2131250842] [2020-10-13 05:03:21,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:21,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-10-13 05:03:21,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329919644] [2020-10-13 05:03:21,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-10-13 05:03:21,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:21,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-10-13 05:03:21,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-10-13 05:03:21,445 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 20 states. [2020-10-13 05:03:21,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:21,672 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2020-10-13 05:03:21,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-10-13 05:03:21,673 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-10-13 05:03:21,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:21,674 INFO L225 Difference]: With dead ends: 89 [2020-10-13 05:03:21,674 INFO L226 Difference]: Without dead ends: 61 [2020-10-13 05:03:21,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-10-13 05:03:21,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-10-13 05:03:21,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 52. [2020-10-13 05:03:21,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-10-13 05:03:21,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-10-13 05:03:21,692 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2020-10-13 05:03:21,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:21,692 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-10-13 05:03:21,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-10-13 05:03:21,692 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-10-13 05:03:21,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-10-13 05:03:21,693 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:21,693 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:21,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-10-13 05:03:21,694 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:21,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:21,695 INFO L82 PathProgramCache]: Analyzing trace with hash 312673994, now seen corresponding path program 23 times [2020-10-13 05:03:21,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:21,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467088442] [2020-10-13 05:03:21,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:21,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:21,722 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:21,863 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:26,110 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:26,718 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:26,718 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 56 [2020-10-13 05:03:26,718 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:03:26,718 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5005 [2020-10-13 05:03:26,719 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:26,719 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 18 [2020-10-13 05:03:26,719 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 30 [2020-10-13 05:03:26,719 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-10-13 05:03:26,719 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:26,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:26,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:26,953 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:26,954 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:26,954 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:26,954 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:26,955 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:26,955 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:26,956 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:26,956 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:26,956 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:26,956 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:03:26,959 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-10-13 05:03:26,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467088442] [2020-10-13 05:03:26,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:26,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-10-13 05:03:26,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437665969] [2020-10-13 05:03:26,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-10-13 05:03:26,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:26,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-10-13 05:03:26,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-10-13 05:03:26,962 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 20 states. [2020-10-13 05:03:27,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:27,287 INFO L93 Difference]: Finished difference Result 114 states and 134 transitions. [2020-10-13 05:03:27,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-10-13 05:03:27,288 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 48 [2020-10-13 05:03:27,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:27,289 INFO L225 Difference]: With dead ends: 114 [2020-10-13 05:03:27,289 INFO L226 Difference]: Without dead ends: 104 [2020-10-13 05:03:27,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-10-13 05:03:27,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-10-13 05:03:27,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 53. [2020-10-13 05:03:27,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-10-13 05:03:27,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2020-10-13 05:03:27,295 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 48 [2020-10-13 05:03:27,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:27,295 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2020-10-13 05:03:27,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-10-13 05:03:27,296 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2020-10-13 05:03:27,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-10-13 05:03:27,296 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:27,296 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:27,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-10-13 05:03:27,296 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:27,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:27,297 INFO L82 PathProgramCache]: Analyzing trace with hash -1014901563, now seen corresponding path program 24 times [2020-10-13 05:03:27,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:27,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1247940761] [2020-10-13 05:03:27,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:27,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:27,314 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:27,385 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:31,524 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:32,309 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:32,309 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 57 [2020-10-13 05:03:32,309 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:03:32,309 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5001 [2020-10-13 05:03:32,310 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:32,310 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 19 [2020-10-13 05:03:32,310 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:03:32,310 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 19 [2020-10-13 05:03:32,310 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:32,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:32,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:32,521 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:32,522 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:32,522 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:32,522 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:32,523 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:32,523 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:32,523 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:32,523 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:32,523 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:32,523 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:32,526 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-10-13 05:03:32,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1247940761] [2020-10-13 05:03:32,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:32,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-10-13 05:03:32,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618124934] [2020-10-13 05:03:32,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-10-13 05:03:32,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:32,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-10-13 05:03:32,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-10-13 05:03:32,528 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 21 states. [2020-10-13 05:03:32,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:32,677 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2020-10-13 05:03:32,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-10-13 05:03:32,678 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-10-13 05:03:32,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:32,679 INFO L225 Difference]: With dead ends: 92 [2020-10-13 05:03:32,679 INFO L226 Difference]: Without dead ends: 63 [2020-10-13 05:03:32,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-10-13 05:03:32,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-10-13 05:03:32,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 54. [2020-10-13 05:03:32,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-10-13 05:03:32,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-10-13 05:03:32,685 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 49 [2020-10-13 05:03:32,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:32,685 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-10-13 05:03:32,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-10-13 05:03:32,685 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-10-13 05:03:32,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-10-13 05:03:32,686 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:32,686 INFO L422 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:32,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-10-13 05:03:32,686 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:32,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:32,687 INFO L82 PathProgramCache]: Analyzing trace with hash -262914071, now seen corresponding path program 25 times [2020-10-13 05:03:32,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:32,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [108758074] [2020-10-13 05:03:32,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:32,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:32,702 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:32,773 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:37,178 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:37,699 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:37,700 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 58 [2020-10-13 05:03:37,700 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:03:37,700 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5002 [2020-10-13 05:03:37,700 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:37,700 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 19 [2020-10-13 05:03:37,700 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 31 [2020-10-13 05:03:37,700 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 19 [2020-10-13 05:03:37,700 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:37,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:37,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:37,928 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:37,929 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:37,929 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:37,929 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:37,929 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:37,929 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:37,930 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:37,930 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:37,930 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:37,930 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:37,933 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-10-13 05:03:37,933 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [108758074] [2020-10-13 05:03:37,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:37,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-10-13 05:03:37,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074333072] [2020-10-13 05:03:37,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-10-13 05:03:37,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:37,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-10-13 05:03:37,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-10-13 05:03:37,935 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 21 states. [2020-10-13 05:03:38,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:38,266 INFO L93 Difference]: Finished difference Result 119 states and 140 transitions. [2020-10-13 05:03:38,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-10-13 05:03:38,267 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 50 [2020-10-13 05:03:38,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:38,269 INFO L225 Difference]: With dead ends: 119 [2020-10-13 05:03:38,269 INFO L226 Difference]: Without dead ends: 109 [2020-10-13 05:03:38,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-10-13 05:03:38,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-10-13 05:03:38,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 55. [2020-10-13 05:03:38,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-10-13 05:03:38,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2020-10-13 05:03:38,275 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 50 [2020-10-13 05:03:38,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:38,275 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2020-10-13 05:03:38,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-10-13 05:03:38,275 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2020-10-13 05:03:38,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-10-13 05:03:38,276 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:38,276 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:38,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-10-13 05:03:38,276 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:38,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:38,277 INFO L82 PathProgramCache]: Analyzing trace with hash -1678262394, now seen corresponding path program 26 times [2020-10-13 05:03:38,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:38,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1075734861] [2020-10-13 05:03:38,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:38,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:38,298 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:38,369 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:43,300 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:43,300 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 59 [2020-10-13 05:03:43,300 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:43,300 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5006 [2020-10-13 05:03:43,300 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:43,300 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 20 [2020-10-13 05:03:43,300 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:03:43,301 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 20 [2020-10-13 05:03:43,301 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:43,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:43,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:43,555 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:43,556 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:43,556 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:43,556 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:43,556 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:43,556 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:43,557 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:43,557 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:43,557 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:43,557 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:43,559 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-10-13 05:03:43,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1075734861] [2020-10-13 05:03:43,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:43,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-10-13 05:03:43,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842023380] [2020-10-13 05:03:43,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-10-13 05:03:43,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:43,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-10-13 05:03:43,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-10-13 05:03:43,561 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand 22 states. [2020-10-13 05:03:43,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:43,711 INFO L93 Difference]: Finished difference Result 95 states and 102 transitions. [2020-10-13 05:03:43,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-10-13 05:03:43,711 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-10-13 05:03:43,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:43,712 INFO L225 Difference]: With dead ends: 95 [2020-10-13 05:03:43,713 INFO L226 Difference]: Without dead ends: 65 [2020-10-13 05:03:43,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-10-13 05:03:43,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-10-13 05:03:43,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 56. [2020-10-13 05:03:43,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-10-13 05:03:43,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-10-13 05:03:43,718 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2020-10-13 05:03:43,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:43,718 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-10-13 05:03:43,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-10-13 05:03:43,719 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-10-13 05:03:43,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-10-13 05:03:43,719 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:43,719 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:43,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-10-13 05:03:43,720 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:43,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:43,720 INFO L82 PathProgramCache]: Analyzing trace with hash -572788310, now seen corresponding path program 27 times [2020-10-13 05:03:43,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:43,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125155340] [2020-10-13 05:03:43,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:43,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:43,733 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:43,809 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:48,730 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:48,731 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 60 [2020-10-13 05:03:48,731 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:48,731 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5001 [2020-10-13 05:03:48,731 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:48,731 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 20 [2020-10-13 05:03:48,731 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 32 [2020-10-13 05:03:48,731 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 20 [2020-10-13 05:03:48,731 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:48,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:48,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:48,979 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:48,980 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:48,980 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:48,981 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:48,981 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:48,981 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:48,981 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:48,981 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:48,981 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:48,982 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:48,984 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-10-13 05:03:48,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125155340] [2020-10-13 05:03:48,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:48,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-10-13 05:03:48,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597740462] [2020-10-13 05:03:48,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-10-13 05:03:48,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:48,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-10-13 05:03:48,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-10-13 05:03:48,986 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 22 states. [2020-10-13 05:03:49,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:49,404 INFO L93 Difference]: Finished difference Result 124 states and 146 transitions. [2020-10-13 05:03:49,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-10-13 05:03:49,405 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 52 [2020-10-13 05:03:49,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:49,406 INFO L225 Difference]: With dead ends: 124 [2020-10-13 05:03:49,406 INFO L226 Difference]: Without dead ends: 114 [2020-10-13 05:03:49,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-10-13 05:03:49,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-10-13 05:03:49,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 57. [2020-10-13 05:03:49,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-10-13 05:03:49,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-10-13 05:03:49,413 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 52 [2020-10-13 05:03:49,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:49,413 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-10-13 05:03:49,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-10-13 05:03:49,413 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-10-13 05:03:49,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-10-13 05:03:49,414 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:49,414 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:49,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-10-13 05:03:49,414 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:49,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:49,415 INFO L82 PathProgramCache]: Analyzing trace with hash 1600538085, now seen corresponding path program 28 times [2020-10-13 05:03:49,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:49,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1656869098] [2020-10-13 05:03:49,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:49,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:49,429 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:49,516 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:54,426 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:54,427 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 61 [2020-10-13 05:03:54,427 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:54,427 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5001 [2020-10-13 05:03:54,427 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:54,427 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 21 [2020-10-13 05:03:54,427 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:03:54,427 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-13 05:03:54,427 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:54,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:54,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:54,695 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:54,695 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:54,695 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:54,696 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:54,696 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 05:03:54,696 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:54,696 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:54,696 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:54,697 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:54,697 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:54,700 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-10-13 05:03:54,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1656869098] [2020-10-13 05:03:54,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:54,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-10-13 05:03:54,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553363095] [2020-10-13 05:03:54,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-10-13 05:03:54,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:54,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-10-13 05:03:54,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-10-13 05:03:54,702 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 23 states. [2020-10-13 05:03:54,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:54,864 INFO L93 Difference]: Finished difference Result 98 states and 105 transitions. [2020-10-13 05:03:54,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-10-13 05:03:54,870 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-10-13 05:03:54,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:54,871 INFO L225 Difference]: With dead ends: 98 [2020-10-13 05:03:54,871 INFO L226 Difference]: Without dead ends: 67 [2020-10-13 05:03:54,872 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-10-13 05:03:54,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-10-13 05:03:54,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 58. [2020-10-13 05:03:54,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-10-13 05:03:54,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-10-13 05:03:54,876 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2020-10-13 05:03:54,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:54,876 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-10-13 05:03:54,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-10-13 05:03:54,876 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-10-13 05:03:54,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-10-13 05:03:54,877 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:54,877 INFO L422 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:54,877 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-10-13 05:03:54,877 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:54,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:54,877 INFO L82 PathProgramCache]: Analyzing trace with hash -1190756599, now seen corresponding path program 29 times [2020-10-13 05:03:54,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:54,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1676598600] [2020-10-13 05:03:54,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:54,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:54,898 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:54,991 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:59,903 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:59,903 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 62 [2020-10-13 05:03:59,903 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:59,903 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5012 [2020-10-13 05:03:59,903 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:59,903 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 21 [2020-10-13 05:03:59,904 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 33 [2020-10-13 05:03:59,904 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-13 05:03:59,904 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:00,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:00,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:00,172 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:00,173 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:00,173 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:00,174 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:00,174 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:00,174 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:00,174 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:00,174 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:00,175 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:00,175 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:00,178 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-10-13 05:04:00,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1676598600] [2020-10-13 05:04:00,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:00,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-10-13 05:04:00,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659887102] [2020-10-13 05:04:00,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-10-13 05:04:00,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:00,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-10-13 05:04:00,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-10-13 05:04:00,181 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 23 states. [2020-10-13 05:04:00,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:00,630 INFO L93 Difference]: Finished difference Result 129 states and 152 transitions. [2020-10-13 05:04:00,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-10-13 05:04:00,630 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 54 [2020-10-13 05:04:00,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:00,631 INFO L225 Difference]: With dead ends: 129 [2020-10-13 05:04:00,631 INFO L226 Difference]: Without dead ends: 119 [2020-10-13 05:04:00,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-10-13 05:04:00,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2020-10-13 05:04:00,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 59. [2020-10-13 05:04:00,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-10-13 05:04:00,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2020-10-13 05:04:00,642 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 54 [2020-10-13 05:04:00,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:00,642 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2020-10-13 05:04:00,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-10-13 05:04:00,642 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2020-10-13 05:04:00,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-10-13 05:04:00,643 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:00,643 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:00,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-10-13 05:04:00,643 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:00,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:00,644 INFO L82 PathProgramCache]: Analyzing trace with hash -376609690, now seen corresponding path program 30 times [2020-10-13 05:04:00,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:00,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [645619177] [2020-10-13 05:04:00,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:00,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:00,677 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:00,769 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:05,670 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:05,670 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 63 [2020-10-13 05:04:05,670 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:05,670 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5002 [2020-10-13 05:04:05,671 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:05,671 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 22 [2020-10-13 05:04:05,671 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:04:05,671 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 22 [2020-10-13 05:04:05,671 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:05,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:05,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:05,959 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:05,960 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:05,960 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:05,960 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:05,960 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:05,960 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:05,960 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:05,960 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:05,960 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:05,961 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:05,963 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-10-13 05:04:05,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [645619177] [2020-10-13 05:04:05,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:05,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-10-13 05:04:05,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378325768] [2020-10-13 05:04:05,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-10-13 05:04:05,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:05,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-10-13 05:04:05,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-10-13 05:04:05,965 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 24 states. [2020-10-13 05:04:06,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:06,093 INFO L93 Difference]: Finished difference Result 101 states and 108 transitions. [2020-10-13 05:04:06,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-10-13 05:04:06,093 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-10-13 05:04:06,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:06,094 INFO L225 Difference]: With dead ends: 101 [2020-10-13 05:04:06,095 INFO L226 Difference]: Without dead ends: 69 [2020-10-13 05:04:06,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-10-13 05:04:06,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-10-13 05:04:06,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2020-10-13 05:04:06,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-10-13 05:04:06,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-10-13 05:04:06,100 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 55 [2020-10-13 05:04:06,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:06,101 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-10-13 05:04:06,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-10-13 05:04:06,101 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-10-13 05:04:06,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-10-13 05:04:06,101 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:06,102 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:06,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-10-13 05:04:06,102 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:06,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:06,102 INFO L82 PathProgramCache]: Analyzing trace with hash 1543758986, now seen corresponding path program 31 times [2020-10-13 05:04:06,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:06,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [634830078] [2020-10-13 05:04:06,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:06,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:06,125 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:06,213 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:11,118 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:11,118 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 64 [2020-10-13 05:04:11,118 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:11,118 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5001 [2020-10-13 05:04:11,118 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:11,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 22 [2020-10-13 05:04:11,119 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 34 [2020-10-13 05:04:11,119 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 22 [2020-10-13 05:04:11,119 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:11,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:11,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:11,409 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:11,411 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:11,411 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:11,411 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:11,411 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:04:11,411 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:11,412 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:11,412 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:11,412 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:11,412 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:11,415 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-10-13 05:04:11,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [634830078] [2020-10-13 05:04:11,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:11,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-10-13 05:04:11,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071995857] [2020-10-13 05:04:11,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-10-13 05:04:11,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:11,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-10-13 05:04:11,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-10-13 05:04:11,421 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 24 states. [2020-10-13 05:04:11,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:11,888 INFO L93 Difference]: Finished difference Result 134 states and 158 transitions. [2020-10-13 05:04:11,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-10-13 05:04:11,889 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 56 [2020-10-13 05:04:11,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:11,892 INFO L225 Difference]: With dead ends: 134 [2020-10-13 05:04:11,892 INFO L226 Difference]: Without dead ends: 124 [2020-10-13 05:04:11,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-10-13 05:04:11,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-10-13 05:04:11,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 61. [2020-10-13 05:04:11,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-10-13 05:04:11,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2020-10-13 05:04:11,898 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 56 [2020-10-13 05:04:11,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:11,899 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2020-10-13 05:04:11,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-10-13 05:04:11,899 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2020-10-13 05:04:11,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-10-13 05:04:11,899 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:11,900 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:11,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-10-13 05:04:11,900 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:11,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:11,900 INFO L82 PathProgramCache]: Analyzing trace with hash -1505972475, now seen corresponding path program 32 times [2020-10-13 05:04:11,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:11,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [190941426] [2020-10-13 05:04:11,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:11,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:11,931 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:12,045 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:16,923 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:16,923 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 65 [2020-10-13 05:04:16,924 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:16,924 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5004 [2020-10-13 05:04:16,924 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:16,924 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 23 [2020-10-13 05:04:16,924 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:04:16,924 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-10-13 05:04:16,924 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:17,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:17,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:17,238 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:17,239 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:17,239 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:17,239 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:17,239 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:17,239 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:17,239 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:17,239 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:17,240 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:17,240 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:17,243 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-10-13 05:04:17,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [190941426] [2020-10-13 05:04:17,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:17,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-10-13 05:04:17,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108974448] [2020-10-13 05:04:17,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-10-13 05:04:17,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:17,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-10-13 05:04:17,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-10-13 05:04:17,245 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand 25 states. [2020-10-13 05:04:17,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:17,442 INFO L93 Difference]: Finished difference Result 104 states and 111 transitions. [2020-10-13 05:04:17,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-10-13 05:04:17,442 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-10-13 05:04:17,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:17,443 INFO L225 Difference]: With dead ends: 104 [2020-10-13 05:04:17,443 INFO L226 Difference]: Without dead ends: 71 [2020-10-13 05:04:17,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-10-13 05:04:17,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-10-13 05:04:17,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 62. [2020-10-13 05:04:17,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-10-13 05:04:17,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-10-13 05:04:17,448 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 57 [2020-10-13 05:04:17,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:17,449 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-10-13 05:04:17,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-10-13 05:04:17,449 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-10-13 05:04:17,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-10-13 05:04:17,449 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:17,450 INFO L422 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:17,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-10-13 05:04:17,450 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:17,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:17,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1427355177, now seen corresponding path program 33 times [2020-10-13 05:04:17,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:17,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2046901567] [2020-10-13 05:04:17,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:17,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:17,478 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:17,577 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:22,468 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:22,468 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 66 [2020-10-13 05:04:22,468 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:22,469 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4999 [2020-10-13 05:04:22,469 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:22,469 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 23 [2020-10-13 05:04:22,469 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 35 [2020-10-13 05:04:22,469 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-10-13 05:04:22,469 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:22,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:22,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:22,787 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:22,787 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:22,787 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:22,787 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:22,788 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:22,788 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:22,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:22,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:22,788 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:22,788 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:22,791 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2020-10-13 05:04:22,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2046901567] [2020-10-13 05:04:22,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:22,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-10-13 05:04:22,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755117088] [2020-10-13 05:04:22,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-10-13 05:04:22,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:22,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-10-13 05:04:22,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-10-13 05:04:22,793 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 25 states. [2020-10-13 05:04:23,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:23,282 INFO L93 Difference]: Finished difference Result 139 states and 164 transitions. [2020-10-13 05:04:23,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-10-13 05:04:23,282 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 58 [2020-10-13 05:04:23,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:23,284 INFO L225 Difference]: With dead ends: 139 [2020-10-13 05:04:23,284 INFO L226 Difference]: Without dead ends: 129 [2020-10-13 05:04:23,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-10-13 05:04:23,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-10-13 05:04:23,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 63. [2020-10-13 05:04:23,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-10-13 05:04:23,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2020-10-13 05:04:23,290 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 58 [2020-10-13 05:04:23,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:23,291 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2020-10-13 05:04:23,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-10-13 05:04:23,291 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2020-10-13 05:04:23,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-10-13 05:04:23,291 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:23,292 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:23,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-10-13 05:04:23,292 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:23,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:23,292 INFO L82 PathProgramCache]: Analyzing trace with hash -819523258, now seen corresponding path program 34 times [2020-10-13 05:04:23,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:23,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [23116874] [2020-10-13 05:04:23,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:23,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:23,325 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:23,440 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:28,321 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:28,321 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 67 [2020-10-13 05:04:28,321 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:28,322 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5009 [2020-10-13 05:04:28,322 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:28,322 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 24 [2020-10-13 05:04:28,322 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 35 [2020-10-13 05:04:28,322 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 24 [2020-10-13 05:04:28,322 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:28,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:28,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:28,663 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:28,664 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:28,664 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:28,664 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:28,664 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 05:04:28,664 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:28,664 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:28,664 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:28,664 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:28,665 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:28,667 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2020-10-13 05:04:28,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [23116874] [2020-10-13 05:04:28,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:28,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-10-13 05:04:28,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034528782] [2020-10-13 05:04:28,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-10-13 05:04:28,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:28,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-10-13 05:04:28,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-10-13 05:04:28,669 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 26 states. [2020-10-13 05:04:29,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:29,189 INFO L93 Difference]: Finished difference Result 168 states and 196 transitions. [2020-10-13 05:04:29,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-10-13 05:04:29,192 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-10-13 05:04:29,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:29,193 INFO L225 Difference]: With dead ends: 168 [2020-10-13 05:04:29,194 INFO L226 Difference]: Without dead ends: 134 [2020-10-13 05:04:29,194 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-10-13 05:04:29,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-10-13 05:04:29,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 65. [2020-10-13 05:04:29,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-10-13 05:04:29,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2020-10-13 05:04:29,200 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 59 [2020-10-13 05:04:29,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:29,201 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2020-10-13 05:04:29,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-10-13 05:04:29,201 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2020-10-13 05:04:29,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-10-13 05:04:29,201 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:29,202 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:29,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-10-13 05:04:29,202 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:29,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:29,202 INFO L82 PathProgramCache]: Analyzing trace with hash -393801691, now seen corresponding path program 35 times [2020-10-13 05:04:29,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:29,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951929309] [2020-10-13 05:04:29,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:29,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:29,233 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:29,353 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:34,234 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:34,234 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 69 [2020-10-13 05:04:34,234 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:34,235 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5011 [2020-10-13 05:04:34,235 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:34,235 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 25 [2020-10-13 05:04:34,235 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 36 [2020-10-13 05:04:34,235 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 25 [2020-10-13 05:04:34,235 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:34,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:34,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:34,604 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:34,605 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:34,605 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:34,605 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:34,605 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:34,605 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:34,605 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:34,605 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:34,605 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:34,606 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:34,608 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2020-10-13 05:04:34,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951929309] [2020-10-13 05:04:34,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:34,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-10-13 05:04:34,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866374267] [2020-10-13 05:04:34,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-10-13 05:04:34,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:34,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-10-13 05:04:34,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-10-13 05:04:34,610 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand 27 states. [2020-10-13 05:04:35,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:35,144 INFO L93 Difference]: Finished difference Result 174 states and 203 transitions. [2020-10-13 05:04:35,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-10-13 05:04:35,145 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-10-13 05:04:35,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:35,146 INFO L225 Difference]: With dead ends: 174 [2020-10-13 05:04:35,146 INFO L226 Difference]: Without dead ends: 139 [2020-10-13 05:04:35,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-10-13 05:04:35,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2020-10-13 05:04:35,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 67. [2020-10-13 05:04:35,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-10-13 05:04:35,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2020-10-13 05:04:35,152 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 61 [2020-10-13 05:04:35,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:35,152 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2020-10-13 05:04:35,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-10-13 05:04:35,153 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2020-10-13 05:04:35,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-10-13 05:04:35,153 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:35,153 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:35,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-10-13 05:04:35,154 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:35,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:35,154 INFO L82 PathProgramCache]: Analyzing trace with hash -654129626, now seen corresponding path program 36 times [2020-10-13 05:04:35,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:35,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534758010] [2020-10-13 05:04:35,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:35,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:35,182 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:35,326 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:40,184 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:40,184 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 71 [2020-10-13 05:04:40,185 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:40,185 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5014 [2020-10-13 05:04:40,185 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:40,185 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 26 [2020-10-13 05:04:40,185 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:04:40,185 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 26 [2020-10-13 05:04:40,185 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:40,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:40,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:40,584 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:40,585 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:40,585 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:40,585 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:40,585 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:40,585 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:40,585 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:40,586 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:40,586 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:40,586 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:40,590 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-10-13 05:04:40,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534758010] [2020-10-13 05:04:40,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:40,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-10-13 05:04:40,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460550264] [2020-10-13 05:04:40,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-10-13 05:04:40,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:40,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-10-13 05:04:40,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-10-13 05:04:40,592 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand 28 states. [2020-10-13 05:04:40,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:40,889 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2020-10-13 05:04:40,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-10-13 05:04:40,890 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-10-13 05:04:40,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:40,891 INFO L225 Difference]: With dead ends: 116 [2020-10-13 05:04:40,891 INFO L226 Difference]: Without dead ends: 80 [2020-10-13 05:04:40,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-10-13 05:04:40,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-10-13 05:04:40,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 68. [2020-10-13 05:04:40,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-10-13 05:04:40,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-10-13 05:04:40,899 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 63 [2020-10-13 05:04:40,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:40,899 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-10-13 05:04:40,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-10-13 05:04:40,899 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-10-13 05:04:40,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-10-13 05:04:40,900 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:40,901 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:40,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-10-13 05:04:40,901 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:40,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:40,902 INFO L82 PathProgramCache]: Analyzing trace with hash -2036800950, now seen corresponding path program 37 times [2020-10-13 05:04:40,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:40,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1433855056] [2020-10-13 05:04:40,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:40,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:40,955 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:41,176 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:45,932 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:45,932 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-13 05:04:45,932 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:45,932 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5001 [2020-10-13 05:04:45,933 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:45,933 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 26 [2020-10-13 05:04:45,933 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 38 [2020-10-13 05:04:45,933 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 26 [2020-10-13 05:04:45,933 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:46,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:46,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:46,339 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:46,340 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:46,340 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:46,340 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:46,341 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:46,341 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:46,341 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:46,341 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:46,341 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:46,341 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:46,348 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-10-13 05:04:46,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1433855056] [2020-10-13 05:04:46,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:46,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-10-13 05:04:46,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775422496] [2020-10-13 05:04:46,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-10-13 05:04:46,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:46,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-10-13 05:04:46,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-10-13 05:04:46,353 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 28 states. [2020-10-13 05:04:46,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:46,850 INFO L93 Difference]: Finished difference Result 154 states and 182 transitions. [2020-10-13 05:04:46,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-10-13 05:04:46,850 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 64 [2020-10-13 05:04:46,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:46,852 INFO L225 Difference]: With dead ends: 154 [2020-10-13 05:04:46,852 INFO L226 Difference]: Without dead ends: 144 [2020-10-13 05:04:46,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-10-13 05:04:46,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-10-13 05:04:46,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 69. [2020-10-13 05:04:46,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-10-13 05:04:46,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2020-10-13 05:04:46,858 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 64 [2020-10-13 05:04:46,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:46,859 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2020-10-13 05:04:46,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-10-13 05:04:46,859 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2020-10-13 05:04:46,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-10-13 05:04:46,860 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:46,860 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:46,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-10-13 05:04:46,860 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:46,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:46,860 INFO L82 PathProgramCache]: Analyzing trace with hash -834180795, now seen corresponding path program 38 times [2020-10-13 05:04:46,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:46,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644848085] [2020-10-13 05:04:46,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:46,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:46,899 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:47,065 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:51,896 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:51,896 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 73 [2020-10-13 05:04:51,896 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:51,896 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5012 [2020-10-13 05:04:51,897 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:51,897 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 27 [2020-10-13 05:04:51,897 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 38 [2020-10-13 05:04:51,897 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 27 [2020-10-13 05:04:51,897 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:52,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:52,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:52,342 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:52,343 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:52,344 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:52,344 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:52,344 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:52,344 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:52,344 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:52,344 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:52,345 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:52,345 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:52,350 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-10-13 05:04:52,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644848085] [2020-10-13 05:04:52,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:52,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-10-13 05:04:52,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077825256] [2020-10-13 05:04:52,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-10-13 05:04:52,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:52,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-10-13 05:04:52,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-10-13 05:04:52,354 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand 29 states. [2020-10-13 05:04:52,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:52,953 INFO L93 Difference]: Finished difference Result 186 states and 217 transitions. [2020-10-13 05:04:52,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-10-13 05:04:52,954 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-10-13 05:04:52,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:52,956 INFO L225 Difference]: With dead ends: 186 [2020-10-13 05:04:52,956 INFO L226 Difference]: Without dead ends: 149 [2020-10-13 05:04:52,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-10-13 05:04:52,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-10-13 05:04:52,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 71. [2020-10-13 05:04:52,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-10-13 05:04:52,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2020-10-13 05:04:52,963 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 65 [2020-10-13 05:04:52,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:52,963 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2020-10-13 05:04:52,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-10-13 05:04:52,963 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2020-10-13 05:04:52,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-10-13 05:04:52,964 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:52,964 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:52,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-10-13 05:04:52,965 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:52,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:52,965 INFO L82 PathProgramCache]: Analyzing trace with hash -337739002, now seen corresponding path program 39 times [2020-10-13 05:04:52,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:52,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [231159693] [2020-10-13 05:04:52,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:52,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:52,994 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:53,165 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:58,000 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:58,000 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 75 [2020-10-13 05:04:58,000 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:58,000 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5016 [2020-10-13 05:04:58,000 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:58,001 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 28 [2020-10-13 05:04:58,001 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:04:58,001 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 28 [2020-10-13 05:04:58,001 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:58,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:58,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:58,444 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:58,445 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:58,445 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:58,445 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:58,446 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:58,446 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:58,446 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:58,446 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:58,446 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:58,446 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:58,449 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2020-10-13 05:04:58,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [231159693] [2020-10-13 05:04:58,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:58,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-10-13 05:04:58,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606636452] [2020-10-13 05:04:58,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-10-13 05:04:58,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:58,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-10-13 05:04:58,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-10-13 05:04:58,451 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand 30 states. [2020-10-13 05:04:58,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:58,734 INFO L93 Difference]: Finished difference Result 122 states and 130 transitions. [2020-10-13 05:04:58,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-10-13 05:04:58,735 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-10-13 05:04:58,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:58,736 INFO L225 Difference]: With dead ends: 122 [2020-10-13 05:04:58,736 INFO L226 Difference]: Without dead ends: 84 [2020-10-13 05:04:58,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-10-13 05:04:58,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-10-13 05:04:58,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 72. [2020-10-13 05:04:58,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-10-13 05:04:58,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-10-13 05:04:58,744 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 67 [2020-10-13 05:04:58,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:58,744 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-10-13 05:04:58,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-10-13 05:04:58,744 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-10-13 05:04:58,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-10-13 05:04:58,745 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:58,745 INFO L422 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:58,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-10-13 05:04:58,746 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:58,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:58,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1795288362, now seen corresponding path program 40 times [2020-10-13 05:04:58,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:58,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556617746] [2020-10-13 05:04:58,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:58,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:58,793 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:58,970 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:03,794 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:03,795 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 76 [2020-10-13 05:05:03,795 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:03,795 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5019 [2020-10-13 05:05:03,795 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:03,795 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 28 [2020-10-13 05:05:03,795 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 40 [2020-10-13 05:05:03,795 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 28 [2020-10-13 05:05:03,796 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:04,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:04,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:04,240 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:04,241 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:04,241 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:04,242 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:04,242 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:04,242 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:04,242 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:04,242 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:04,242 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:04,242 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:04,246 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2020-10-13 05:05:04,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556617746] [2020-10-13 05:05:04,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:04,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-10-13 05:05:04,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445969179] [2020-10-13 05:05:04,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-10-13 05:05:04,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:04,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-10-13 05:05:04,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-10-13 05:05:04,247 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 30 states. [2020-10-13 05:05:04,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:04,863 INFO L93 Difference]: Finished difference Result 164 states and 194 transitions. [2020-10-13 05:05:04,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-10-13 05:05:04,864 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 68 [2020-10-13 05:05:04,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:04,866 INFO L225 Difference]: With dead ends: 164 [2020-10-13 05:05:04,866 INFO L226 Difference]: Without dead ends: 154 [2020-10-13 05:05:04,867 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-10-13 05:05:04,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-10-13 05:05:04,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 73. [2020-10-13 05:05:04,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-10-13 05:05:04,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2020-10-13 05:05:04,873 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 68 [2020-10-13 05:05:04,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:04,873 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2020-10-13 05:05:04,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-10-13 05:05:04,873 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2020-10-13 05:05:04,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-10-13 05:05:04,874 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:04,874 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:04,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-10-13 05:05:04,875 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:04,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:04,875 INFO L82 PathProgramCache]: Analyzing trace with hash 1996470885, now seen corresponding path program 41 times [2020-10-13 05:05:04,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:04,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822766419] [2020-10-13 05:05:04,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:04,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:04,904 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:05,084 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:09,907 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:09,907 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 77 [2020-10-13 05:05:09,907 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:09,907 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5013 [2020-10-13 05:05:09,907 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:09,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 29 [2020-10-13 05:05:09,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 40 [2020-10-13 05:05:09,908 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 29 [2020-10-13 05:05:09,908 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:10,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:10,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:10,387 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:10,388 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:10,388 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:10,388 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:10,389 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:10,389 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:10,389 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:10,389 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:10,389 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:10,389 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:10,393 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2020-10-13 05:05:10,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822766419] [2020-10-13 05:05:10,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:10,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-10-13 05:05:10,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401035648] [2020-10-13 05:05:10,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-10-13 05:05:10,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:10,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-10-13 05:05:10,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-10-13 05:05:10,394 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 31 states. [2020-10-13 05:05:11,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:11,038 INFO L93 Difference]: Finished difference Result 198 states and 231 transitions. [2020-10-13 05:05:11,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-10-13 05:05:11,039 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-10-13 05:05:11,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:11,041 INFO L225 Difference]: With dead ends: 198 [2020-10-13 05:05:11,041 INFO L226 Difference]: Without dead ends: 159 [2020-10-13 05:05:11,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-10-13 05:05:11,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2020-10-13 05:05:11,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 75. [2020-10-13 05:05:11,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-10-13 05:05:11,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2020-10-13 05:05:11,048 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 69 [2020-10-13 05:05:11,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:11,049 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2020-10-13 05:05:11,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-10-13 05:05:11,049 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2020-10-13 05:05:11,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-10-13 05:05:11,050 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:11,050 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:11,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-10-13 05:05:11,050 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:11,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:11,051 INFO L82 PathProgramCache]: Analyzing trace with hash 620251110, now seen corresponding path program 42 times [2020-10-13 05:05:11,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:11,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687193161] [2020-10-13 05:05:11,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:11,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:11,091 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:11,348 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:16,088 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:16,088 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 79 [2020-10-13 05:05:16,088 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:16,088 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5014 [2020-10-13 05:05:16,089 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:16,089 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 30 [2020-10-13 05:05:16,089 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:05:16,089 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 30 [2020-10-13 05:05:16,089 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:16,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:16,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:16,568 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:16,569 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:16,569 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:16,569 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:16,569 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:16,569 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:16,570 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:16,570 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:16,570 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:16,570 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:16,574 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2020-10-13 05:05:16,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687193161] [2020-10-13 05:05:16,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:16,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-10-13 05:05:16,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359239327] [2020-10-13 05:05:16,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-10-13 05:05:16,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:16,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-10-13 05:05:16,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-10-13 05:05:16,575 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand 32 states. [2020-10-13 05:05:16,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:16,741 INFO L93 Difference]: Finished difference Result 128 states and 136 transitions. [2020-10-13 05:05:16,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-10-13 05:05:16,742 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-10-13 05:05:16,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:16,743 INFO L225 Difference]: With dead ends: 128 [2020-10-13 05:05:16,743 INFO L226 Difference]: Without dead ends: 88 [2020-10-13 05:05:16,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-10-13 05:05:16,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-10-13 05:05:16,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 76. [2020-10-13 05:05:16,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-10-13 05:05:16,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-10-13 05:05:16,749 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 71 [2020-10-13 05:05:16,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:16,750 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-10-13 05:05:16,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-10-13 05:05:16,750 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-10-13 05:05:16,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-10-13 05:05:16,751 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:16,751 INFO L422 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:16,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-10-13 05:05:16,751 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:16,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:16,752 INFO L82 PathProgramCache]: Analyzing trace with hash 844234762, now seen corresponding path program 43 times [2020-10-13 05:05:16,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:16,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450461319] [2020-10-13 05:05:16,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:16,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:16,795 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:17,059 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:21,781 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:21,781 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 80 [2020-10-13 05:05:21,781 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:21,781 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5005 [2020-10-13 05:05:21,782 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:21,782 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 30 [2020-10-13 05:05:21,782 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 42 [2020-10-13 05:05:21,782 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 30 [2020-10-13 05:05:21,782 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:22,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:22,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:22,289 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:22,290 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:22,291 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:22,291 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:22,291 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:22,291 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:22,291 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:22,291 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:22,291 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:22,291 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:22,295 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2020-10-13 05:05:22,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450461319] [2020-10-13 05:05:22,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:22,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-10-13 05:05:22,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656597738] [2020-10-13 05:05:22,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-10-13 05:05:22,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:22,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-10-13 05:05:22,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-10-13 05:05:22,297 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 32 states. [2020-10-13 05:05:22,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:22,959 INFO L93 Difference]: Finished difference Result 174 states and 206 transitions. [2020-10-13 05:05:22,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-10-13 05:05:22,960 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 72 [2020-10-13 05:05:22,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:22,962 INFO L225 Difference]: With dead ends: 174 [2020-10-13 05:05:22,962 INFO L226 Difference]: Without dead ends: 164 [2020-10-13 05:05:22,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-10-13 05:05:22,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2020-10-13 05:05:22,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 77. [2020-10-13 05:05:22,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-10-13 05:05:22,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2020-10-13 05:05:22,969 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 72 [2020-10-13 05:05:22,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:22,970 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2020-10-13 05:05:22,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-10-13 05:05:22,970 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2020-10-13 05:05:22,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-10-13 05:05:22,971 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:22,971 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:22,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-10-13 05:05:22,971 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:22,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:22,972 INFO L82 PathProgramCache]: Analyzing trace with hash -1716386939, now seen corresponding path program 44 times [2020-10-13 05:05:22,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:22,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1320984669] [2020-10-13 05:05:22,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:22,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:23,004 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:23,245 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:28,000 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:28,000 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 81 [2020-10-13 05:05:28,000 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:28,000 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5008 [2020-10-13 05:05:28,000 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:28,001 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 31 [2020-10-13 05:05:28,001 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:05:28,001 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 31 [2020-10-13 05:05:28,001 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:28,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:28,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:28,517 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:28,518 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:28,518 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:28,518 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:28,518 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:28,518 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:28,518 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:28,519 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:28,519 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:28,519 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:28,522 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2020-10-13 05:05:28,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1320984669] [2020-10-13 05:05:28,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:28,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-10-13 05:05:28,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829312157] [2020-10-13 05:05:28,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-10-13 05:05:28,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:28,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-10-13 05:05:28,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-10-13 05:05:28,525 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand 33 states. [2020-10-13 05:05:28,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:28,786 INFO L93 Difference]: Finished difference Result 134 states and 143 transitions. [2020-10-13 05:05:28,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-10-13 05:05:28,786 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-10-13 05:05:28,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:28,787 INFO L225 Difference]: With dead ends: 134 [2020-10-13 05:05:28,788 INFO L226 Difference]: Without dead ends: 93 [2020-10-13 05:05:28,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-10-13 05:05:28,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-10-13 05:05:28,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 78. [2020-10-13 05:05:28,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-10-13 05:05:28,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-10-13 05:05:28,794 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 73 [2020-10-13 05:05:28,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:28,795 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-10-13 05:05:28,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-10-13 05:05:28,795 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-10-13 05:05:28,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-10-13 05:05:28,798 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:28,798 INFO L422 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:28,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-10-13 05:05:28,798 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:28,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:28,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1216462167, now seen corresponding path program 45 times [2020-10-13 05:05:28,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:28,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [825841755] [2020-10-13 05:05:28,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:28,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:28,838 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:29,050 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:33,833 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:33,833 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 82 [2020-10-13 05:05:33,833 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:33,833 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5010 [2020-10-13 05:05:33,834 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:33,834 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 31 [2020-10-13 05:05:33,834 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 43 [2020-10-13 05:05:33,834 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 31 [2020-10-13 05:05:33,834 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:34,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:34,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:34,534 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:34,535 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:34,535 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:34,535 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:34,535 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:34,535 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:34,536 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:34,536 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:34,536 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:34,536 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:34,541 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2020-10-13 05:05:34,541 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [825841755] [2020-10-13 05:05:34,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:34,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-10-13 05:05:34,542 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541834923] [2020-10-13 05:05:34,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-10-13 05:05:34,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:34,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-10-13 05:05:34,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-10-13 05:05:34,543 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 33 states. [2020-10-13 05:05:35,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:35,216 INFO L93 Difference]: Finished difference Result 179 states and 212 transitions. [2020-10-13 05:05:35,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-10-13 05:05:35,217 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 74 [2020-10-13 05:05:35,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:35,218 INFO L225 Difference]: With dead ends: 179 [2020-10-13 05:05:35,218 INFO L226 Difference]: Without dead ends: 169 [2020-10-13 05:05:35,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-10-13 05:05:35,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2020-10-13 05:05:35,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 79. [2020-10-13 05:05:35,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-10-13 05:05:35,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2020-10-13 05:05:35,229 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 74 [2020-10-13 05:05:35,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:35,230 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2020-10-13 05:05:35,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-10-13 05:05:35,230 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2020-10-13 05:05:35,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-10-13 05:05:35,231 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:35,231 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:35,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-10-13 05:05:35,231 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:35,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:35,231 INFO L82 PathProgramCache]: Analyzing trace with hash -1173482298, now seen corresponding path program 46 times [2020-10-13 05:05:35,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:35,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [76423092] [2020-10-13 05:05:35,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:35,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:35,273 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:35,810 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:40,277 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:40,277 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 83 [2020-10-13 05:05:40,277 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:40,277 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5021 [2020-10-13 05:05:40,277 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:40,278 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 32 [2020-10-13 05:05:40,278 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 43 [2020-10-13 05:05:40,278 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 32 [2020-10-13 05:05:40,278 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:40,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:40,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:40,898 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:40,899 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:40,900 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:40,900 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:40,900 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:40,900 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:40,900 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:40,900 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:40,900 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:40,900 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:40,905 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2020-10-13 05:05:40,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [76423092] [2020-10-13 05:05:40,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:40,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-10-13 05:05:40,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371943704] [2020-10-13 05:05:40,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-10-13 05:05:40,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:40,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-10-13 05:05:40,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-10-13 05:05:40,908 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand 34 states. [2020-10-13 05:05:41,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:41,615 INFO L93 Difference]: Finished difference Result 216 states and 252 transitions. [2020-10-13 05:05:41,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-10-13 05:05:41,615 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-10-13 05:05:41,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:41,617 INFO L225 Difference]: With dead ends: 216 [2020-10-13 05:05:41,617 INFO L226 Difference]: Without dead ends: 174 [2020-10-13 05:05:41,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-10-13 05:05:41,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2020-10-13 05:05:41,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 81. [2020-10-13 05:05:41,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-10-13 05:05:41,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2020-10-13 05:05:41,625 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 75 [2020-10-13 05:05:41,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:41,626 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2020-10-13 05:05:41,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-10-13 05:05:41,626 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2020-10-13 05:05:41,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-10-13 05:05:41,627 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:41,627 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:41,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-10-13 05:05:41,628 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:41,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:41,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1528806235, now seen corresponding path program 47 times [2020-10-13 05:05:41,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:41,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [526157685] [2020-10-13 05:05:41,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:41,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:41,669 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:41,963 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:46,665 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:46,666 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 85 [2020-10-13 05:05:46,666 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:46,666 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5014 [2020-10-13 05:05:46,666 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:46,666 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 33 [2020-10-13 05:05:46,666 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:05:46,666 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 33 [2020-10-13 05:05:46,666 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:47,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:47,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:47,278 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:47,279 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:47,280 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:47,280 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:47,280 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:47,280 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:47,281 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:47,281 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:47,281 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:47,281 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:47,287 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2020-10-13 05:05:47,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [526157685] [2020-10-13 05:05:47,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:47,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-10-13 05:05:47,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017118436] [2020-10-13 05:05:47,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-10-13 05:05:47,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:47,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-10-13 05:05:47,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-10-13 05:05:47,289 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand 35 states. [2020-10-13 05:05:47,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:47,555 INFO L93 Difference]: Finished difference Result 140 states and 149 transitions. [2020-10-13 05:05:47,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-10-13 05:05:47,556 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-10-13 05:05:47,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:47,557 INFO L225 Difference]: With dead ends: 140 [2020-10-13 05:05:47,557 INFO L226 Difference]: Without dead ends: 97 [2020-10-13 05:05:47,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-10-13 05:05:47,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-10-13 05:05:47,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 82. [2020-10-13 05:05:47,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-10-13 05:05:47,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-10-13 05:05:47,564 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 77 [2020-10-13 05:05:47,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:47,564 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-10-13 05:05:47,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-10-13 05:05:47,564 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-10-13 05:05:47,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-10-13 05:05:47,565 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:47,565 INFO L422 BasicCegarLoop]: trace histogram [32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:47,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-10-13 05:05:47,565 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:47,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:47,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1987072457, now seen corresponding path program 48 times [2020-10-13 05:05:47,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:47,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1961056303] [2020-10-13 05:05:47,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:47,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:47,607 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:48,069 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:52,617 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:52,617 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 86 [2020-10-13 05:05:52,617 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:52,617 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5027 [2020-10-13 05:05:52,617 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:52,618 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 33 [2020-10-13 05:05:52,618 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 45 [2020-10-13 05:05:52,618 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 33 [2020-10-13 05:05:52,618 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:53,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:53,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:53,235 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:53,236 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:53,236 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:53,236 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:53,236 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:53,236 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:53,237 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:53,237 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:53,237 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:53,237 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:53,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2020-10-13 05:05:53,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1961056303] [2020-10-13 05:05:53,244 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:53,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-10-13 05:05:53,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649569954] [2020-10-13 05:05:53,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-10-13 05:05:53,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:53,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-10-13 05:05:53,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-10-13 05:05:53,245 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 35 states. [2020-10-13 05:05:53,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:53,926 INFO L93 Difference]: Finished difference Result 189 states and 224 transitions. [2020-10-13 05:05:53,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-10-13 05:05:53,927 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 78 [2020-10-13 05:05:53,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:53,928 INFO L225 Difference]: With dead ends: 189 [2020-10-13 05:05:53,928 INFO L226 Difference]: Without dead ends: 179 [2020-10-13 05:05:53,929 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-10-13 05:05:53,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2020-10-13 05:05:53,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 83. [2020-10-13 05:05:53,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-10-13 05:05:53,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2020-10-13 05:05:53,935 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 78 [2020-10-13 05:05:53,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:53,936 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2020-10-13 05:05:53,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-10-13 05:05:53,936 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2020-10-13 05:05:53,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-10-13 05:05:53,936 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:53,937 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:53,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-10-13 05:05:53,937 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:53,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:53,937 INFO L82 PathProgramCache]: Analyzing trace with hash -648156762, now seen corresponding path program 49 times [2020-10-13 05:05:53,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:53,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230600908] [2020-10-13 05:05:53,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:53,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:53,979 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:54,292 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:58,978 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:58,979 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 87 [2020-10-13 05:05:58,979 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:58,979 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5017 [2020-10-13 05:05:58,979 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:58,979 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 34 [2020-10-13 05:05:58,979 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 45 [2020-10-13 05:05:58,980 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 34 [2020-10-13 05:05:58,980 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:59,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:59,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:59,597 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:59,598 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:59,598 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:59,598 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:59,598 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:59,598 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:59,599 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:59,599 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:59,599 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:59,599 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:59,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2020-10-13 05:05:59,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230600908] [2020-10-13 05:05:59,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:59,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-10-13 05:05:59,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321179036] [2020-10-13 05:05:59,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-10-13 05:05:59,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:59,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-10-13 05:05:59,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-10-13 05:05:59,605 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand 36 states. [2020-10-13 05:06:00,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:06:00,519 INFO L93 Difference]: Finished difference Result 228 states and 266 transitions. [2020-10-13 05:06:00,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-10-13 05:06:00,520 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-10-13 05:06:00,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:06:00,522 INFO L225 Difference]: With dead ends: 228 [2020-10-13 05:06:00,522 INFO L226 Difference]: Without dead ends: 184 [2020-10-13 05:06:00,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-10-13 05:06:00,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-10-13 05:06:00,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 85. [2020-10-13 05:06:00,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-10-13 05:06:00,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2020-10-13 05:06:00,532 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 79 [2020-10-13 05:06:00,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:06:00,533 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2020-10-13 05:06:00,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-10-13 05:06:00,533 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2020-10-13 05:06:00,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-10-13 05:06:00,533 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:06:00,534 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:06:00,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-10-13 05:06:00,534 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:06:00,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:06:00,534 INFO L82 PathProgramCache]: Analyzing trace with hash -561218107, now seen corresponding path program 50 times [2020-10-13 05:06:00,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:06:00,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [20417942] [2020-10-13 05:06:00,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:06:00,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:06:00,596 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:06:01,171 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:06:05,597 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:06:05,597 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 89 [2020-10-13 05:06:05,598 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:06:05,598 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5027 [2020-10-13 05:06:05,598 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:06:05,598 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 35 [2020-10-13 05:06:05,598 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 46 [2020-10-13 05:06:05,598 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 35 [2020-10-13 05:06:05,598 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:06:06,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:06:06,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:06:06,261 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:06:06,261 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:06:06,262 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:06:06,262 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:06:06,262 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:06:06,262 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:06:06,262 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:06:06,262 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:06:06,262 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:06:06,262 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:06:06,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2020-10-13 05:06:06,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [20417942] [2020-10-13 05:06:06,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:06:06,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-10-13 05:06:06,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843112287] [2020-10-13 05:06:06,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-10-13 05:06:06,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:06:06,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-10-13 05:06:06,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-10-13 05:06:06,269 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand 37 states. [2020-10-13 05:06:07,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:06:07,025 INFO L93 Difference]: Finished difference Result 234 states and 273 transitions. [2020-10-13 05:06:07,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-10-13 05:06:07,026 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-10-13 05:06:07,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:06:07,028 INFO L225 Difference]: With dead ends: 234 [2020-10-13 05:06:07,028 INFO L226 Difference]: Without dead ends: 189 [2020-10-13 05:06:07,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-10-13 05:06:07,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-10-13 05:06:07,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 87. [2020-10-13 05:06:07,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-10-13 05:06:07,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2020-10-13 05:06:07,038 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 81 [2020-10-13 05:06:07,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:06:07,038 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2020-10-13 05:06:07,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-10-13 05:06:07,039 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2020-10-13 05:06:07,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-10-13 05:06:07,039 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:06:07,039 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:06:07,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-10-13 05:06:07,040 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:06:07,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:06:07,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1985624442, now seen corresponding path program 51 times [2020-10-13 05:06:07,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:06:07,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2124158837] [2020-10-13 05:06:07,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:06:07,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:06:07,076 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:06:09,538 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:06:11,291 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:06:12,091 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:06:12,091 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 91 [2020-10-13 05:06:12,091 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:06:12,091 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5027 [2020-10-13 05:06:12,091 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:06:12,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 36 [2020-10-13 05:06:12,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:06:12,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 36 [2020-10-13 05:06:12,092 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:06:12,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:06:12,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:06:12,775 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:06:12,776 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:06:12,776 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:06:12,776 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:06:12,776 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:06:12,777 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:06:12,777 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:06:12,777 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:06:12,777 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:06:12,777 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:06:12,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2020-10-13 05:06:12,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2124158837] [2020-10-13 05:06:12,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:06:12,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-10-13 05:06:12,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765805788] [2020-10-13 05:06:12,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-10-13 05:06:12,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:06:12,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-10-13 05:06:12,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-10-13 05:06:12,783 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand 38 states. [2020-10-13 05:06:13,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:06:13,132 INFO L93 Difference]: Finished difference Result 149 states and 158 transitions. [2020-10-13 05:06:13,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-10-13 05:06:13,133 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-10-13 05:06:13,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:06:13,134 INFO L225 Difference]: With dead ends: 149 [2020-10-13 05:06:13,134 INFO L226 Difference]: Without dead ends: 103 [2020-10-13 05:06:13,135 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-10-13 05:06:13,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-10-13 05:06:13,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 88. [2020-10-13 05:06:13,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-10-13 05:06:13,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-10-13 05:06:13,139 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 83 [2020-10-13 05:06:13,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:06:13,140 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-10-13 05:06:13,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-10-13 05:06:13,140 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-10-13 05:06:13,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-10-13 05:06:13,140 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:06:13,141 INFO L422 BasicCegarLoop]: trace histogram [35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:06:13,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-10-13 05:06:13,141 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:06:13,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:06:13,141 INFO L82 PathProgramCache]: Analyzing trace with hash 278423722, now seen corresponding path program 52 times [2020-10-13 05:06:13,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:06:13,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [869246458] [2020-10-13 05:06:13,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:06:13,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:06:13,172 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:06:14,882 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:06:18,177 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:06:18,178 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 92 [2020-10-13 05:06:18,178 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:06:18,178 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5017 [2020-10-13 05:06:18,178 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:06:18,178 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 36 [2020-10-13 05:06:18,178 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 48 [2020-10-13 05:06:18,178 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 36 [2020-10-13 05:06:18,179 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:06:18,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:06:18,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:06:18,878 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:06:18,879 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:06:18,879 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:06:18,879 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:06:18,879 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:06:18,879 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:06:18,880 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:06:18,880 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:06:18,880 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:06:18,880 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:06:18,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-10-13 05:06:18,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [869246458] [2020-10-13 05:06:18,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:06:18,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-10-13 05:06:18,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435196093] [2020-10-13 05:06:18,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-10-13 05:06:18,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:06:18,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-10-13 05:06:18,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-10-13 05:06:18,887 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 38 states. [2020-10-13 05:06:19,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:06:19,562 INFO L93 Difference]: Finished difference Result 204 states and 242 transitions. [2020-10-13 05:06:19,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-10-13 05:06:19,563 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 84 [2020-10-13 05:06:19,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:06:19,565 INFO L225 Difference]: With dead ends: 204 [2020-10-13 05:06:19,565 INFO L226 Difference]: Without dead ends: 194 [2020-10-13 05:06:19,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-10-13 05:06:19,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-10-13 05:06:19,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 89. [2020-10-13 05:06:19,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-10-13 05:06:19,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2020-10-13 05:06:19,571 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 84 [2020-10-13 05:06:19,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:06:19,571 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2020-10-13 05:06:19,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-10-13 05:06:19,572 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2020-10-13 05:06:19,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-10-13 05:06:19,572 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:06:19,572 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:06:19,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-10-13 05:06:19,573 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:06:19,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:06:19,573 INFO L82 PathProgramCache]: Analyzing trace with hash -2076659995, now seen corresponding path program 53 times [2020-10-13 05:06:19,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:06:19,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585033782] [2020-10-13 05:06:19,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:06:19,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:06:19,604 FATAL L256 erpolLogProxyWrapper]: Now shrinking...