/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/partial_lesser_bound.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-12 10:20:48,756 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-12 10:20:48,759 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-12 10:20:48,786 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-12 10:20:48,787 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-12 10:20:48,788 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-12 10:20:48,790 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-12 10:20:48,793 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-12 10:20:48,796 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-12 10:20:48,798 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-12 10:20:48,799 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-12 10:20:48,801 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-12 10:20:48,801 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-12 10:20:48,803 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-12 10:20:48,804 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-12 10:20:48,806 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-12 10:20:48,807 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-12 10:20:48,814 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-12 10:20:48,820 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-12 10:20:48,826 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-12 10:20:48,828 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-12 10:20:48,830 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-12 10:20:48,835 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-12 10:20:48,836 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-12 10:20:48,845 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-12 10:20:48,845 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-12 10:20:48,845 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-12 10:20:48,850 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-12 10:20:48,851 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-12 10:20:48,854 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-12 10:20:48,855 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-12 10:20:48,858 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-12 10:20:48,859 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-12 10:20:48,861 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-12 10:20:48,865 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-12 10:20:48,865 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-12 10:20:48,866 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-12 10:20:48,866 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-12 10:20:48,867 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-12 10:20:48,869 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-12 10:20:48,872 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-12 10:20:48,873 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-12 10:20:48,934 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-12 10:20:48,935 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-12 10:20:48,938 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-12 10:20:48,938 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-12 10:20:48,939 INFO L138 SettingsManager]: * Use SBE=true [2020-10-12 10:20:48,939 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-12 10:20:48,940 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-12 10:20:48,940 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-12 10:20:48,940 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-12 10:20:48,940 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-12 10:20:48,941 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-12 10:20:48,942 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-12 10:20:48,942 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-12 10:20:48,943 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-12 10:20:48,943 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-12 10:20:48,944 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-12 10:20:48,944 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-12 10:20:48,944 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-12 10:20:48,944 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-12 10:20:48,944 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-12 10:20:48,945 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-12 10:20:48,945 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-12 10:20:48,945 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-12 10:20:48,945 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-12 10:20:48,946 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-12 10:20:48,946 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-12 10:20:48,946 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-12 10:20:48,946 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-12 10:20:48,947 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-12 10:20:48,947 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; [2020-10-12 10:20:49,344 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-12 10:20:49,361 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-12 10:20:49,366 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-12 10:20:49,368 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-12 10:20:49,369 INFO L275 PluginConnector]: CDTParser initialized [2020-10-12 10:20:49,370 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/partial_lesser_bound.i [2020-10-12 10:20:49,471 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8ac631d64/6f1bc0b616184a02a4876d51447b96fd/FLAGd3cde2ca0 [2020-10-12 10:20:50,107 INFO L306 CDTParser]: Found 1 translation units. [2020-10-12 10:20:50,108 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/partial_lesser_bound.i [2020-10-12 10:20:50,117 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8ac631d64/6f1bc0b616184a02a4876d51447b96fd/FLAGd3cde2ca0 [2020-10-12 10:20:50,452 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8ac631d64/6f1bc0b616184a02a4876d51447b96fd [2020-10-12 10:20:50,465 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-12 10:20:50,468 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-12 10:20:50,469 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-12 10:20:50,470 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-12 10:20:50,474 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-12 10:20:50,476 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 10:20:50" (1/1) ... [2020-10-12 10:20:50,480 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39315203 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 10:20:50, skipping insertion in model container [2020-10-12 10:20:50,480 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 10:20:50" (1/1) ... [2020-10-12 10:20:50,490 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-12 10:20:50,512 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-12 10:20:50,732 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 10:20:50,747 INFO L203 MainTranslator]: Completed pre-run [2020-10-12 10:20:50,769 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 10:20:50,795 INFO L208 MainTranslator]: Completed translation [2020-10-12 10:20:50,796 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 10:20:50 WrapperNode [2020-10-12 10:20:50,796 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-12 10:20:50,797 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-12 10:20:50,797 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-12 10:20:50,798 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-12 10:20:50,925 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 10:20:50" (1/1) ... [2020-10-12 10:20:50,925 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 10:20:50" (1/1) ... [2020-10-12 10:20:50,936 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 10:20:50" (1/1) ... [2020-10-12 10:20:50,937 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 10:20:50" (1/1) ... [2020-10-12 10:20:50,947 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 10:20:50" (1/1) ... [2020-10-12 10:20:50,953 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 10:20:50" (1/1) ... [2020-10-12 10:20:50,955 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 10:20:50" (1/1) ... [2020-10-12 10:20:50,958 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-12 10:20:50,959 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-12 10:20:50,959 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-12 10:20:50,959 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-12 10:20:50,964 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 10:20:50" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-12 10:20:51,039 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-12 10:20:51,039 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-12 10:20:51,039 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-12 10:20:51,040 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-12 10:20:51,040 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-12 10:20:51,040 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-12 10:20:51,041 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-10-12 10:20:51,042 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-12 10:20:51,042 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-10-12 10:20:51,042 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-10-12 10:20:51,044 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-10-12 10:20:51,044 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-12 10:20:51,044 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-12 10:20:51,044 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-12 10:20:51,045 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-12 10:20:51,388 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-12 10:20:51,388 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-10-12 10:20:51,395 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 10:20:51 BoogieIcfgContainer [2020-10-12 10:20:51,395 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-12 10:20:51,397 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-12 10:20:51,398 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-12 10:20:51,402 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-12 10:20:51,403 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.10 10:20:50" (1/3) ... [2020-10-12 10:20:51,404 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3534881c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 10:20:51, skipping insertion in model container [2020-10-12 10:20:51,404 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 10:20:50" (2/3) ... [2020-10-12 10:20:51,405 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3534881c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 10:20:51, skipping insertion in model container [2020-10-12 10:20:51,405 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 10:20:51" (3/3) ... [2020-10-12 10:20:51,407 INFO L109 eAbstractionObserver]: Analyzing ICFG partial_lesser_bound.i [2020-10-12 10:20:51,422 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-12 10:20:51,431 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-12 10:20:51,453 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-12 10:20:51,503 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-12 10:20:51,503 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-12 10:20:51,503 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-12 10:20:51,504 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-12 10:20:51,504 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-12 10:20:51,504 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-12 10:20:51,504 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-12 10:20:51,504 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-12 10:20:51,529 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-10-12 10:20:51,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-12 10:20:51,534 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 10:20:51,535 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 10:20:51,536 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 10:20:51,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 10:20:51,544 INFO L82 PathProgramCache]: Analyzing trace with hash 1778002988, now seen corresponding path program 1 times [2020-10-12 10:20:51,553 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 10:20:51,554 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957870780] [2020-10-12 10:20:51,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 10:20:51,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 10:20:51,727 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:51,830 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:52,076 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 10:20:52,077 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-12 10:20:52,077 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 10:20:52,077 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 380 [2020-10-12 10:20:52,081 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 10:20:52,082 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-12 10:20:52,082 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-12 10:20:52,083 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-12 10:20:52,083 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 5 [2020-10-12 10:20:52,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 10:20:52,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 10:20:52,213 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:52,230 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 10:20:52,231 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 10:20:52,231 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 10:20:52,232 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 19 [2020-10-12 10:20:52,232 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 10:20:52,232 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 10:20:52,233 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 10:20:52,233 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 10:20:52,233 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 10:20:52,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 10:20:52,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957870780] [2020-10-12 10:20:52,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 10:20:52,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-12 10:20:52,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311266591] [2020-10-12 10:20:52,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-12 10:20:52,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 10:20:52,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-12 10:20:52,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-12 10:20:52,283 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 4 states. [2020-10-12 10:20:52,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 10:20:52,569 INFO L93 Difference]: Finished difference Result 60 states and 79 transitions. [2020-10-12 10:20:52,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-12 10:20:52,572 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-10-12 10:20:52,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 10:20:52,584 INFO L225 Difference]: With dead ends: 60 [2020-10-12 10:20:52,585 INFO L226 Difference]: Without dead ends: 36 [2020-10-12 10:20:52,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-12 10:20:52,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-12 10:20:52,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 24. [2020-10-12 10:20:52,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-10-12 10:20:52,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-10-12 10:20:52,650 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 15 [2020-10-12 10:20:52,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 10:20:52,651 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-10-12 10:20:52,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-12 10:20:52,651 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-10-12 10:20:52,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-12 10:20:52,652 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 10:20:52,653 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 10:20:52,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-12 10:20:52,653 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 10:20:52,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 10:20:52,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1323409058, now seen corresponding path program 1 times [2020-10-12 10:20:52,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 10:20:52,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [667731630] [2020-10-12 10:20:52,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 10:20:52,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 10:20:52,685 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:52,713 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:53,139 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:53,952 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 10:20:53,953 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-10-12 10:20:53,953 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-12 10:20:53,954 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1278 [2020-10-12 10:20:53,954 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 10:20:53,955 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-10-12 10:20:53,955 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-12 10:20:53,955 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-10-12 10:20:53,956 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 10:20:54,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 10:20:54,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 10:20:54,151 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:54,158 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 10:20:54,162 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 10:20:54,163 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 10:20:54,163 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 10 [2020-10-12 10:20:54,164 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 10:20:54,164 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 10:20:54,164 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 10:20:54,165 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 10:20:54,166 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 10:20:54,178 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-12 10:20:54,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [667731630] [2020-10-12 10:20:54,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 10:20:54,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-10-12 10:20:54,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626426185] [2020-10-12 10:20:54,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-12 10:20:54,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 10:20:54,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-12 10:20:54,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-10-12 10:20:54,194 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 9 states. [2020-10-12 10:20:54,617 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 38 [2020-10-12 10:20:54,776 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 41 [2020-10-12 10:20:55,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 10:20:55,007 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-10-12 10:20:55,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-12 10:20:55,008 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-10-12 10:20:55,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 10:20:55,010 INFO L225 Difference]: With dead ends: 36 [2020-10-12 10:20:55,010 INFO L226 Difference]: Without dead ends: 34 [2020-10-12 10:20:55,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2020-10-12 10:20:55,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-12 10:20:55,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-10-12 10:20:55,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-12 10:20:55,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-10-12 10:20:55,026 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 19 [2020-10-12 10:20:55,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 10:20:55,026 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-10-12 10:20:55,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-12 10:20:55,027 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-10-12 10:20:55,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-12 10:20:55,028 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 10:20:55,028 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] [2020-10-12 10:20:55,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-12 10:20:55,029 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 10:20:55,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 10:20:55,030 INFO L82 PathProgramCache]: Analyzing trace with hash -96694823, now seen corresponding path program 1 times [2020-10-12 10:20:55,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 10:20:55,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1958752878] [2020-10-12 10:20:55,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 10:20:55,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 10:20:55,051 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:55,073 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:55,135 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:55,266 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:55,901 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:56,881 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 10:20:56,882 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 37 [2020-10-12 10:20:56,882 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-12 10:20:56,883 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1836 [2020-10-12 10:20:56,883 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 10:20:56,883 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 13 [2020-10-12 10:20:56,884 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-12 10:20:56,884 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 26 [2020-10-12 10:20:56,885 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 10:20:58,168 WARN L193 SmtUtils]: Spent 908.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 73 [2020-10-12 10:20:58,923 WARN L193 SmtUtils]: Spent 665.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 72 [2020-10-12 10:20:59,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 10:20:59,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 10:20:59,166 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:59,177 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 10:20:59,178 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 10:20:59,178 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 10:20:59,178 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 14 [2020-10-12 10:20:59,178 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 10:20:59,179 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-12 10:20:59,179 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 10:20:59,179 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-12 10:20:59,179 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 10:20:59,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-10-12 10:20:59,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 10:20:59,190 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:20:59,200 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 10:20:59,200 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-12 10:20:59,201 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 10:20:59,201 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 11 [2020-10-12 10:20:59,201 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 10:20:59,202 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-12 10:20:59,202 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 10:20:59,202 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-12 10:20:59,202 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 10:20:59,264 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-12 10:20:59,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1958752878] [2020-10-12 10:20:59,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 10:20:59,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-12 10:20:59,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970080285] [2020-10-12 10:20:59,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-12 10:20:59,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 10:20:59,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-12 10:20:59,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-10-12 10:20:59,268 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 12 states. [2020-10-12 10:21:00,015 WARN L193 SmtUtils]: Spent 512.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 75 [2020-10-12 10:21:00,946 WARN L193 SmtUtils]: Spent 543.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 86 [2020-10-12 10:21:01,727 WARN L193 SmtUtils]: Spent 659.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 93 [2020-10-12 10:21:02,509 WARN L193 SmtUtils]: Spent 670.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 108 [2020-10-12 10:21:03,217 WARN L193 SmtUtils]: Spent 624.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 111 [2020-10-12 10:21:03,903 WARN L193 SmtUtils]: Spent 554.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 115 [2020-10-12 10:21:04,566 WARN L193 SmtUtils]: Spent 493.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 87 [2020-10-12 10:21:04,835 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-10-12 10:21:04,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 10:21:04,910 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2020-10-12 10:21:04,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-10-12 10:21:04,917 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 27 [2020-10-12 10:21:04,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 10:21:04,921 INFO L225 Difference]: With dead ends: 52 [2020-10-12 10:21:04,922 INFO L226 Difference]: Without dead ends: 32 [2020-10-12 10:21:04,923 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=124, Invalid=428, Unknown=0, NotChecked=0, Total=552 [2020-10-12 10:21:04,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-10-12 10:21:04,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-10-12 10:21:04,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-12 10:21:04,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-10-12 10:21:04,948 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 27 [2020-10-12 10:21:04,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 10:21:04,948 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-10-12 10:21:04,948 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-12 10:21:04,949 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-10-12 10:21:04,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-12 10:21:04,950 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 10:21:04,950 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 10:21:04,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-12 10:21:04,955 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 10:21:04,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 10:21:04,958 INFO L82 PathProgramCache]: Analyzing trace with hash -836061513, now seen corresponding path program 2 times [2020-10-12 10:21:04,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 10:21:04,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255494523] [2020-10-12 10:21:04,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 10:21:04,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 10:21:04,978 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:21:04,992 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:21:05,027 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:21:05,142 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:21:06,225 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:21:06,850 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:21:07,706 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 10:21:07,707 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 39 [2020-10-12 10:21:07,707 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 6 [2020-10-12 10:21:07,708 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2731 [2020-10-12 10:21:07,708 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 10:21:07,708 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 18 [2020-10-12 10:21:07,708 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 5 [2020-10-12 10:21:07,709 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 33 [2020-10-12 10:21:07,709 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 10:21:10,981 WARN L193 SmtUtils]: Spent 443.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 69 [2020-10-12 10:21:11,956 WARN L193 SmtUtils]: Spent 750.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 91 [2020-10-12 10:21:20,084 WARN L193 SmtUtils]: Spent 7.42 s on a formula simplification. DAG size of input: 183 DAG size of output: 159 [2020-10-12 10:21:27,813 WARN L193 SmtUtils]: Spent 7.00 s on a formula simplification. DAG size of input: 168 DAG size of output: 150 [2020-10-12 10:21:28,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 10:21:28,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 10:21:28,268 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:21:28,279 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 10:21:28,279 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 10:21:28,279 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 10:21:28,280 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 12 [2020-10-12 10:21:28,280 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 10:21:28,280 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-12 10:21:28,280 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 10:21:28,281 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-12 10:21:28,281 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 10:21:28,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-10-12 10:21:28,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 10:21:28,290 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 10:21:28,300 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 10:21:28,301 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-12 10:21:28,301 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 10:21:28,301 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 12 [2020-10-12 10:21:28,302 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 10:21:28,302 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-12 10:21:28,302 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 10:21:28,302 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-12 10:21:28,302 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 10:21:28,402 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-12 10:21:28,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255494523] [2020-10-12 10:21:28,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 10:21:28,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-10-12 10:21:28,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79431193] [2020-10-12 10:21:28,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-10-12 10:21:28,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 10:21:28,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-10-12 10:21:28,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2020-10-12 10:21:28,408 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 16 states. [2020-10-12 10:21:29,660 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2020-10-12 10:21:59,990 WARN L193 SmtUtils]: Spent 29.16 s on a formula simplification. DAG size of input: 212 DAG size of output: 192 [2020-10-12 10:22:34,274 WARN L193 SmtUtils]: Spent 30.44 s on a formula simplification. DAG size of input: 196 DAG size of output: 194 [2020-10-12 10:23:04,618 WARN L193 SmtUtils]: Spent 27.67 s on a formula simplification. DAG size of input: 210 DAG size of output: 208 [2020-10-12 10:23:50,455 WARN L193 SmtUtils]: Spent 43.08 s on a formula simplification. DAG size of input: 218 DAG size of output: 217 [2020-10-12 10:24:34,305 WARN L193 SmtUtils]: Spent 39.47 s on a formula simplification. DAG size of input: 221 DAG size of output: 220