/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 SingleStatement --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=1000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_4.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-24 19:34:17,769 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-24 19:34:17,773 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-24 19:34:17,819 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-24 19:34:17,820 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-24 19:34:17,830 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-24 19:34:17,833 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-24 19:34:17,837 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-24 19:34:17,840 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-24 19:34:17,844 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-24 19:34:17,845 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-24 19:34:17,846 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-24 19:34:17,846 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-24 19:34:17,849 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-24 19:34:17,852 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-24 19:34:17,854 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-24 19:34:17,856 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-24 19:34:17,857 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-24 19:34:17,859 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-24 19:34:17,869 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-24 19:34:17,871 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-24 19:34:17,873 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-24 19:34:17,876 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-24 19:34:17,877 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-24 19:34:17,880 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-24 19:34:17,881 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-24 19:34:17,881 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-24 19:34:17,884 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-24 19:34:17,885 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-24 19:34:17,887 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-24 19:34:17,887 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-24 19:34:17,888 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-24 19:34:17,889 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-24 19:34:17,889 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-24 19:34:17,891 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-24 19:34:17,891 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-24 19:34:17,892 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-24 19:34:17,892 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-24 19:34:17,892 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-24 19:34:17,893 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-24 19:34:17,895 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-24 19:34:17,896 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 [2020-09-24 19:34:17,942 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-24 19:34:17,943 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-24 19:34:17,945 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-24 19:34:17,945 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-24 19:34:17,946 INFO L138 SettingsManager]: * Use SBE=true [2020-09-24 19:34:17,946 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-24 19:34:17,946 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-24 19:34:17,946 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-24 19:34:17,947 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-24 19:34:17,947 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-24 19:34:17,948 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-24 19:34:17,948 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-24 19:34:17,948 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-24 19:34:17,949 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-24 19:34:17,949 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-24 19:34:17,949 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-24 19:34:17,950 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-24 19:34:17,950 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-24 19:34:17,950 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-24 19:34:17,950 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-24 19:34:17,950 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-24 19:34:17,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-24 19:34:17,951 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-24 19:34:17,951 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-24 19:34:17,951 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-24 19:34:17,951 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-24 19:34:17,952 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-24 19:34:17,952 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-24 19:34:17,952 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-24 19:34:17,952 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 -> SingleStatement 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=1000;interpolation-heuristic=SMALLEST;log-additional-information=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=1000;interpolation-heuristic=SMALLEST;log-additional-information=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=1000;interpolation-heuristic=SMALLEST;log-additional-information=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=1000;interpolation-heuristic=SMALLEST;log-additional-information=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=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-09-24 19:34:18,422 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-24 19:34:18,441 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-24 19:34:18,446 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-24 19:34:18,448 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-24 19:34:18,448 INFO L275 PluginConnector]: CDTParser initialized [2020-09-24 19:34:18,449 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_4.i [2020-09-24 19:34:18,534 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/404a0cef5/5b765e7c4546461886d46829337398a7/FLAGe9008d40f [2020-09-24 19:34:19,130 INFO L306 CDTParser]: Found 1 translation units. [2020-09-24 19:34:19,131 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-crafted/simple_array_index_value_4.i [2020-09-24 19:34:19,140 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/404a0cef5/5b765e7c4546461886d46829337398a7/FLAGe9008d40f [2020-09-24 19:34:19,463 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/404a0cef5/5b765e7c4546461886d46829337398a7 [2020-09-24 19:34:19,476 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-24 19:34:19,483 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-24 19:34:19,484 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-24 19:34:19,484 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-24 19:34:19,488 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-24 19:34:19,489 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 07:34:19" (1/1) ... [2020-09-24 19:34:19,494 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44dc5d33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 07:34:19, skipping insertion in model container [2020-09-24 19:34:19,494 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 07:34:19" (1/1) ... [2020-09-24 19:34:19,503 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-24 19:34:19,533 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-24 19:34:19,757 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 19:34:19,762 INFO L203 MainTranslator]: Completed pre-run [2020-09-24 19:34:19,791 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 19:34:19,812 INFO L208 MainTranslator]: Completed translation [2020-09-24 19:34:19,812 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 07:34:19 WrapperNode [2020-09-24 19:34:19,813 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-24 19:34:19,813 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-24 19:34:19,814 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-24 19:34:19,814 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-24 19:34:19,902 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 07:34:19" (1/1) ... [2020-09-24 19:34:19,902 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 07:34:19" (1/1) ... [2020-09-24 19:34:19,914 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 07:34:19" (1/1) ... [2020-09-24 19:34:19,914 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 07:34:19" (1/1) ... [2020-09-24 19:34:19,923 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 07:34:19" (1/1) ... [2020-09-24 19:34:19,930 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 07:34:19" (1/1) ... [2020-09-24 19:34:19,931 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 07:34:19" (1/1) ... [2020-09-24 19:34:19,934 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-24 19:34:19,934 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-24 19:34:19,935 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-24 19:34:19,935 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-24 19:34:19,936 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 07:34:19" (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 [2020-09-24 19:34:20,007 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-24 19:34:20,008 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-24 19:34:20,008 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-24 19:34:20,008 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-24 19:34:20,008 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-24 19:34:20,009 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-24 19:34:20,009 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-24 19:34:20,009 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-24 19:34:20,009 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-24 19:34:20,010 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-24 19:34:20,010 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-24 19:34:20,010 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-24 19:34:20,010 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-24 19:34:20,010 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-24 19:34:20,010 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-24 19:34:20,011 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-24 19:34:20,011 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-24 19:34:20,322 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-24 19:34:20,322 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-09-24 19:34:20,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 07:34:20 BoogieIcfgContainer [2020-09-24 19:34:20,330 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-24 19:34:20,332 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-24 19:34:20,332 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-24 19:34:20,337 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-24 19:34:20,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.09 07:34:19" (1/3) ... [2020-09-24 19:34:20,338 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3239fb8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 07:34:20, skipping insertion in model container [2020-09-24 19:34:20,338 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 07:34:19" (2/3) ... [2020-09-24 19:34:20,339 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3239fb8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 07:34:20, skipping insertion in model container [2020-09-24 19:34:20,339 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 07:34:20" (3/3) ... [2020-09-24 19:34:20,342 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_4.i [2020-09-24 19:34:20,356 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-24 19:34:20,366 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-24 19:34:20,390 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-24 19:34:20,423 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-24 19:34:20,423 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-24 19:34:20,423 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-24 19:34:20,423 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-24 19:34:20,423 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-24 19:34:20,423 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-24 19:34:20,424 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-24 19:34:20,424 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-24 19:34:20,459 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states. [2020-09-24 19:34:20,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-24 19:34:20,467 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 19:34:20,468 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 19:34:20,468 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 19:34:20,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 19:34:20,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1727331883, now seen corresponding path program 1 times [2020-09-24 19:34:20,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 19:34:20,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823720513] [2020-09-24 19:34:20,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 19:34:20,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:20,694 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:20,987 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:21,546 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:21,546 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 43 [2020-09-24 19:34:21,547 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-24 19:34:21,547 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 891 [2020-09-24 19:34:21,550 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:21,551 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-09-24 19:34:21,551 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 30 [2020-09-24 19:34:21,551 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-09-24 19:34:21,551 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-09-24 19:34:21,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 19:34:21,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:21,751 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:21,759 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:21,759 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-24 19:34:21,760 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:21,760 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-09-24 19:34:21,760 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:21,761 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 19:34:21,761 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:34:21,761 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 19:34:21,762 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 19:34:21,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-09-24 19:34:21,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:21,771 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:21,780 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:21,780 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:34:21,781 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:21,781 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-09-24 19:34:21,781 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:21,782 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 19:34:21,782 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:34:21,782 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 19:34:21,783 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 19:34:21,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-09-24 19:34:21,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:21,793 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:21,805 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:21,806 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:34:21,806 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:21,806 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 15 [2020-09-24 19:34:21,807 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:21,807 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-24 19:34:21,807 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:34:21,808 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-09-24 19:34:21,808 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 19:34:21,846 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-24 19:34:21,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823720513] [2020-09-24 19:34:21,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 19:34:21,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-09-24 19:34:21,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25032904] [2020-09-24 19:34:21,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-24 19:34:21,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 19:34:21,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-24 19:34:21,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-09-24 19:34:21,894 INFO L87 Difference]: Start difference. First operand 61 states. Second operand 9 states. [2020-09-24 19:34:22,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 19:34:22,360 INFO L93 Difference]: Finished difference Result 141 states and 174 transitions. [2020-09-24 19:34:22,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-24 19:34:22,362 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2020-09-24 19:34:22,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 19:34:22,376 INFO L225 Difference]: With dead ends: 141 [2020-09-24 19:34:22,376 INFO L226 Difference]: Without dead ends: 79 [2020-09-24 19:34:22,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-09-24 19:34:22,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-09-24 19:34:22,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 60. [2020-09-24 19:34:22,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-09-24 19:34:22,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-09-24 19:34:22,444 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 30 [2020-09-24 19:34:22,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 19:34:22,444 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-09-24 19:34:22,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-24 19:34:22,445 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-09-24 19:34:22,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-24 19:34:22,448 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 19:34:22,448 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 19:34:22,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-24 19:34:22,449 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 19:34:22,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 19:34:22,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1086220015, now seen corresponding path program 1 times [2020-09-24 19:34:22,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 19:34:22,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [753328311] [2020-09-24 19:34:22,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 19:34:22,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:22,485 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:22,554 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:22,554 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 47 [2020-09-24 19:34:22,555 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:22,555 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 82 [2020-09-24 19:34:22,555 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:22,555 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-24 19:34:22,555 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 17 [2020-09-24 19:34:22,556 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-09-24 19:34:22,556 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:34:22,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 19:34:22,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:22,627 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:22,635 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:22,635 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-24 19:34:22,636 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:22,636 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-09-24 19:34:22,636 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:22,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 19:34:22,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:34:22,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 19:34:22,638 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 19:34:22,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-09-24 19:34:22,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:22,651 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:22,676 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:22,676 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:34:22,677 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:22,677 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 28 [2020-09-24 19:34:22,677 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:22,677 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-24 19:34:22,678 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:34:22,678 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-24 19:34:22,678 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:34:22,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-09-24 19:34:22,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:22,691 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:22,705 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:22,706 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:34:22,706 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:22,706 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 17 [2020-09-24 19:34:22,707 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:22,707 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-24 19:34:22,707 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:34:22,708 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-24 19:34:22,708 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 19:34:22,715 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-24 19:34:22,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [753328311] [2020-09-24 19:34:22,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 19:34:22,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-24 19:34:22,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669793438] [2020-09-24 19:34:22,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-24 19:34:22,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 19:34:22,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-24 19:34:22,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-24 19:34:22,721 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 4 states. [2020-09-24 19:34:22,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 19:34:22,900 INFO L93 Difference]: Finished difference Result 91 states and 97 transitions. [2020-09-24 19:34:22,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-24 19:34:22,902 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 34 [2020-09-24 19:34:22,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 19:34:22,904 INFO L225 Difference]: With dead ends: 91 [2020-09-24 19:34:22,904 INFO L226 Difference]: Without dead ends: 72 [2020-09-24 19:34:22,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-24 19:34:22,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-09-24 19:34:22,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 60. [2020-09-24 19:34:22,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-09-24 19:34:22,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2020-09-24 19:34:22,934 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 34 [2020-09-24 19:34:22,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 19:34:22,937 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2020-09-24 19:34:22,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-24 19:34:22,938 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2020-09-24 19:34:22,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-09-24 19:34:22,942 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 19:34:22,943 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 19:34:22,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-24 19:34:22,945 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 19:34:22,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 19:34:22,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1811286385, now seen corresponding path program 1 times [2020-09-24 19:34:22,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 19:34:22,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [87090253] [2020-09-24 19:34:22,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 19:34:23,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:23,035 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:23,239 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:23,824 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:24,007 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:24,060 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:24,061 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 69 [2020-09-24 19:34:24,061 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-09-24 19:34:24,061 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1056 [2020-09-24 19:34:24,062 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:24,062 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-09-24 19:34:24,062 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 36 [2020-09-24 19:34:24,062 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 32 [2020-09-24 19:34:24,062 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:34:24,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 19:34:24,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:24,229 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:24,234 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:24,235 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-24 19:34:24,235 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:24,235 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-09-24 19:34:24,235 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:24,236 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 19:34:24,236 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:34:24,236 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 19:34:24,236 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:34:24,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-09-24 19:34:24,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:24,241 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:24,245 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:24,246 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:34:24,246 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:24,246 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-24 19:34:24,247 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:24,247 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 19:34:24,247 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:34:24,247 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 19:34:24,248 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 19:34:24,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-09-24 19:34:24,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:24,252 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:24,257 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:24,258 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:34:24,258 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:24,258 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-24 19:34:24,258 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:24,259 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 19:34:24,259 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:34:24,259 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 19:34:24,259 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 19:34:24,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2020-09-24 19:34:24,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:24,269 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:24,284 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:24,285 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:34:24,285 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:24,285 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 18 [2020-09-24 19:34:24,285 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:24,286 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-09-24 19:34:24,286 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:34:24,286 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-09-24 19:34:24,286 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:34:24,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-09-24 19:34:24,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:24,326 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:24,336 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:24,337 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:34:24,337 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:24,337 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-09-24 19:34:24,338 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:24,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-24 19:34:24,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:34:24,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-24 19:34:24,338 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:34:24,349 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-09-24 19:34:24,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [87090253] [2020-09-24 19:34:24,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 19:34:24,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-24 19:34:24,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665619647] [2020-09-24 19:34:24,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-24 19:34:24,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 19:34:24,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-24 19:34:24,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-09-24 19:34:24,370 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 11 states. [2020-09-24 19:34:24,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 19:34:24,915 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-09-24 19:34:24,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-24 19:34:24,916 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 52 [2020-09-24 19:34:24,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 19:34:24,918 INFO L225 Difference]: With dead ends: 82 [2020-09-24 19:34:24,918 INFO L226 Difference]: Without dead ends: 80 [2020-09-24 19:34:24,919 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2020-09-24 19:34:24,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-09-24 19:34:24,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 62. [2020-09-24 19:34:24,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-09-24 19:34:24,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2020-09-24 19:34:24,931 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 52 [2020-09-24 19:34:24,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 19:34:24,931 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2020-09-24 19:34:24,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-24 19:34:24,932 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2020-09-24 19:34:24,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-09-24 19:34:24,933 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 19:34:24,933 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 19:34:24,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-24 19:34:24,934 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 19:34:24,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 19:34:24,934 INFO L82 PathProgramCache]: Analyzing trace with hash 2082234165, now seen corresponding path program 1 times [2020-09-24 19:34:24,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 19:34:24,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1752077168] [2020-09-24 19:34:24,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 19:34:24,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:34:25,044 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:34:26,010 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:34:26,011 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 73 [2020-09-24 19:34:26,011 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:34:26,011 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1019 [2020-09-24 19:34:26,012 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:34:26,012 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 16 [2020-09-24 19:34:26,012 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 36 [2020-09-24 19:34:26,012 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 36 [2020-09-24 19:34:26,012 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:34:26,938 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 49 [2020-09-24 19:34:38,413 WARN L193 SmtUtils]: Spent 11.40 s on a formula simplification. DAG size of input: 139 DAG size of output: 87 [2020-09-24 19:34:49,836 WARN L193 SmtUtils]: Spent 11.36 s on a formula simplification. DAG size of input: 147 DAG size of output: 100 [2020-09-24 19:35:01,767 WARN L193 SmtUtils]: Spent 11.85 s on a formula simplification. DAG size of input: 256 DAG size of output: 102 [2020-09-24 19:35:10,803 WARN L193 SmtUtils]: Spent 8.93 s on a formula simplification. DAG size of input: 129 DAG size of output: 93 [2020-09-24 19:35:11,819 WARN L193 SmtUtils]: Spent 928.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 87 [2020-09-24 19:35:25,170 WARN L193 SmtUtils]: Spent 13.18 s on a formula simplification. DAG size of input: 123 DAG size of output: 97 [2020-09-24 19:35:25,419 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 51 [2020-09-24 19:35:25,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 19:35:25,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:35:25,686 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:35:25,692 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:35:25,692 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-24 19:35:25,692 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:35:25,692 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-09-24 19:35:25,693 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:35:25,693 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 19:35:25,693 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:35:25,693 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 19:35:25,694 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:35:25,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-09-24 19:35:25,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:35:25,698 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:35:25,703 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:35:25,703 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:35:25,703 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:35:25,704 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-24 19:35:25,704 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:35:25,704 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 19:35:25,704 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:35:25,704 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 19:35:25,705 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:35:25,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2020-09-24 19:35:25,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:35:25,709 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:35:25,713 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:35:25,713 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:35:25,714 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:35:25,714 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-24 19:35:25,714 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:35:25,714 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 19:35:25,714 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:35:25,715 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 19:35:25,715 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:35:25,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2020-09-24 19:35:25,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:35:25,722 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:35:25,737 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:35:25,737 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:35:25,737 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:35:25,738 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 17 [2020-09-24 19:35:25,738 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:35:25,738 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-24 19:35:25,738 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:35:25,739 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-24 19:35:25,739 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:35:25,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-09-24 19:35:25,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 19:35:26,027 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-24 19:35:26,427 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-24 19:35:26,427 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-24 19:35:26,428 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 19:35:26,428 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 513 [2020-09-24 19:35:26,428 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-24 19:35:26,428 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-09-24 19:35:26,428 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 19:35:26,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-09-24 19:35:26,429 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 19:35:26,744 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-09-24 19:35:26,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1752077168] [2020-09-24 19:35:26,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 19:35:26,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2020-09-24 19:35:26,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152122353] [2020-09-24 19:35:26,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-24 19:35:26,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 19:35:26,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-24 19:35:26,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-09-24 19:35:26,748 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand 18 states.