/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-13 11:10:08,455 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-13 11:10:08,460 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-13 11:10:08,499 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-13 11:10:08,500 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-13 11:10:08,508 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-13 11:10:08,509 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-13 11:10:08,511 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-13 11:10:08,514 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-13 11:10:08,517 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-13 11:10:08,518 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-13 11:10:08,520 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-13 11:10:08,521 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-13 11:10:08,523 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-13 11:10:08,526 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-13 11:10:08,528 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-13 11:10:08,530 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-13 11:10:08,531 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-13 11:10:08,533 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-13 11:10:08,541 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-13 11:10:08,543 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-13 11:10:08,544 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-13 11:10:08,545 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-13 11:10:08,546 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-13 11:10:08,558 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-13 11:10:08,561 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-13 11:10:08,561 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-13 11:10:08,562 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-13 11:10:08,563 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-13 11:10:08,564 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-13 11:10:08,564 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-13 11:10:08,565 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-13 11:10:08,565 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-13 11:10:08,566 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-13 11:10:08,570 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-13 11:10:08,570 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-13 11:10:08,574 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-13 11:10:08,575 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-13 11:10:08,575 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-13 11:10:08,576 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-13 11:10:08,577 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-13 11:10:08,579 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-13 11:10:08,620 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-13 11:10:08,621 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-13 11:10:08,622 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-13 11:10:08,623 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-13 11:10:08,623 INFO L138 SettingsManager]: * Use SBE=true [2020-10-13 11:10:08,623 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-13 11:10:08,624 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-13 11:10:08,624 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-13 11:10:08,624 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-13 11:10:08,624 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-13 11:10:08,625 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-13 11:10:08,625 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-13 11:10:08,626 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-13 11:10:08,626 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-13 11:10:08,627 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-13 11:10:08,627 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-13 11:10:08,628 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-13 11:10:08,628 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-13 11:10:08,628 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-13 11:10:08,628 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-13 11:10:08,629 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-13 11:10:08,629 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-13 11:10:08,629 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-13 11:10:08,629 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-13 11:10:08,630 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-13 11:10:08,630 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-13 11:10:08,630 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-13 11:10:08,630 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-13 11:10:08,630 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-13 11:10:08,630 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; [2020-10-13 11:10:08,919 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-13 11:10:08,938 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-13 11:10:08,944 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-13 11:10:08,946 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-13 11:10:08,948 INFO L275 PluginConnector]: CDTParser initialized [2020-10-13 11:10:08,949 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-10-13 11:10:09,029 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/08a5f1b67/672501b3e2f749c38c0575d8c0109783/FLAG72d94cdab [2020-10-13 11:10:09,536 INFO L306 CDTParser]: Found 1 translation units. [2020-10-13 11:10:09,536 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/string-2.i [2020-10-13 11:10:09,542 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/08a5f1b67/672501b3e2f749c38c0575d8c0109783/FLAG72d94cdab [2020-10-13 11:10:09,883 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/08a5f1b67/672501b3e2f749c38c0575d8c0109783 [2020-10-13 11:10:09,892 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-13 11:10:09,894 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-13 11:10:09,895 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-13 11:10:09,895 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-13 11:10:09,899 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-13 11:10:09,900 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 11:10:09" (1/1) ... [2020-10-13 11:10:09,904 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31051650 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:10:09, skipping insertion in model container [2020-10-13 11:10:09,905 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 11:10:09" (1/1) ... [2020-10-13 11:10:09,915 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-13 11:10:09,940 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-13 11:10:10,143 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 11:10:10,147 INFO L203 MainTranslator]: Completed pre-run [2020-10-13 11:10:10,175 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 11:10:10,288 INFO L208 MainTranslator]: Completed translation [2020-10-13 11:10:10,288 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:10:10 WrapperNode [2020-10-13 11:10:10,288 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-13 11:10:10,289 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-13 11:10:10,289 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-13 11:10:10,289 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-13 11:10:10,304 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:10:10" (1/1) ... [2020-10-13 11:10:10,304 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:10:10" (1/1) ... [2020-10-13 11:10:10,314 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:10:10" (1/1) ... [2020-10-13 11:10:10,315 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:10:10" (1/1) ... [2020-10-13 11:10:10,325 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:10:10" (1/1) ... [2020-10-13 11:10:10,332 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:10:10" (1/1) ... [2020-10-13 11:10:10,334 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:10:10" (1/1) ... [2020-10-13 11:10:10,337 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-13 11:10:10,337 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-13 11:10:10,337 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-13 11:10:10,337 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-13 11:10:10,338 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:10:10" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-13 11:10:10,397 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-13 11:10:10,398 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-13 11:10:10,398 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-13 11:10:10,398 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-13 11:10:10,398 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-13 11:10:10,398 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-13 11:10:10,398 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-13 11:10:10,399 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-13 11:10:10,399 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-13 11:10:10,399 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-10-13 11:10:10,399 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-13 11:10:10,399 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-13 11:10:10,399 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-13 11:10:10,400 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-13 11:10:10,400 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-13 11:10:10,400 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-13 11:10:10,400 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-13 11:10:10,757 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-13 11:10:10,758 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-10-13 11:10:10,762 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 11:10:10 BoogieIcfgContainer [2020-10-13 11:10:10,762 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-13 11:10:10,763 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-13 11:10:10,764 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-13 11:10:10,767 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-13 11:10:10,767 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 11:10:09" (1/3) ... [2020-10-13 11:10:10,768 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b9560a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 11:10:10, skipping insertion in model container [2020-10-13 11:10:10,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 11:10:10" (2/3) ... [2020-10-13 11:10:10,769 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b9560a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 11:10:10, skipping insertion in model container [2020-10-13 11:10:10,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 11:10:10" (3/3) ... [2020-10-13 11:10:10,770 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-10-13 11:10:10,781 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-13 11:10:10,788 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-13 11:10:10,802 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-13 11:10:10,823 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-13 11:10:10,823 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-13 11:10:10,823 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-13 11:10:10,823 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-13 11:10:10,823 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-13 11:10:10,824 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-13 11:10:10,824 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-13 11:10:10,824 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-13 11:10:10,841 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-10-13 11:10:10,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-13 11:10:10,847 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:10:10,848 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:10:10,849 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:10:10,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:10:10,854 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-10-13 11:10:10,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:10:10,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1238393826] [2020-10-13 11:10:10,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:10:10,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:10,997 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:11,035 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:11,060 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:11,108 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:11,133 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:11,459 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:11,459 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 30 [2020-10-13 11:10:11,459 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-13 11:10:11,460 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 486 [2020-10-13 11:10:11,462 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:11,463 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:10:11,463 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 20 [2020-10-13 11:10:11,464 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:10:11,464 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-13 11:10:11,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:10:11,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:11,532 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:11,536 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:11,536 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:10:11,537 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:10:11,537 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-13 11:10:11,537 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:11,538 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:10:11,538 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:10:11,538 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:10:11,539 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 11:10:11,547 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:10:11,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1238393826] [2020-10-13 11:10:11,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 11:10:11,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-13 11:10:11,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292650206] [2020-10-13 11:10:11,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-13 11:10:11,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:10:11,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-13 11:10:11,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-13 11:10:11,573 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2020-10-13 11:10:11,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:10:11,685 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2020-10-13 11:10:11,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-13 11:10:11,687 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-10-13 11:10:11,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:10:11,696 INFO L225 Difference]: With dead ends: 62 [2020-10-13 11:10:11,697 INFO L226 Difference]: Without dead ends: 28 [2020-10-13 11:10:11,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-13 11:10:11,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-10-13 11:10:11,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-10-13 11:10:11,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-10-13 11:10:11,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2020-10-13 11:10:11,740 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2020-10-13 11:10:11,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:10:11,740 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2020-10-13 11:10:11,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-13 11:10:11,741 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2020-10-13 11:10:11,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-13 11:10:11,742 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:10:11,742 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:10:11,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-13 11:10:11,743 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:10:11,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:10:11,743 INFO L82 PathProgramCache]: Analyzing trace with hash 1282672092, now seen corresponding path program 1 times [2020-10-13 11:10:11,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:10:11,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [852959489] [2020-10-13 11:10:11,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:10:11,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:11,764 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:11,789 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:11,908 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:11,908 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 32 [2020-10-13 11:10:11,908 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:10:11,909 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 149 [2020-10-13 11:10:11,909 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:11,910 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 11:10:11,911 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 11:10:11,911 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 11:10:11,912 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-13 11:10:11,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:10:11,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:11,967 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:11,969 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:11,970 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:10:11,970 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:10:11,970 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-13 11:10:11,970 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:11,971 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:10:11,971 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:10:11,971 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:10:11,971 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:10:11,976 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:10:11,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [852959489] [2020-10-13 11:10:11,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 11:10:11,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-13 11:10:11,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536708973] [2020-10-13 11:10:11,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-13 11:10:11,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:10:11,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-13 11:10:11,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 11:10:11,980 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 4 states. [2020-10-13 11:10:12,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:10:12,073 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2020-10-13 11:10:12,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-13 11:10:12,073 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2020-10-13 11:10:12,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:10:12,076 INFO L225 Difference]: With dead ends: 56 [2020-10-13 11:10:12,077 INFO L226 Difference]: Without dead ends: 36 [2020-10-13 11:10:12,078 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 11:10:12,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-13 11:10:12,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-10-13 11:10:12,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-13 11:10:12,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-10-13 11:10:12,087 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2020-10-13 11:10:12,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:10:12,087 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-10-13 11:10:12,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-13 11:10:12,088 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-10-13 11:10:12,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-13 11:10:12,089 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:10:12,089 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:10:12,089 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-13 11:10:12,089 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:10:12,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:10:12,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-10-13 11:10:12,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:10:12,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [738762434] [2020-10-13 11:10:12,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:10:12,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:12,104 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:12,117 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:12,273 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:12,274 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 36 [2020-10-13 11:10:12,274 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:10:12,274 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 173 [2020-10-13 11:10:12,275 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:12,275 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-13 11:10:12,275 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 11:10:12,275 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-13 11:10:12,276 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:10:12,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:10:12,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:12,308 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:12,309 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:12,310 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:10:12,310 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:10:12,310 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 11:10:12,311 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:12,311 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:10:12,311 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:10:12,311 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:10:12,312 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:10:12,315 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-13 11:10:12,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [738762434] [2020-10-13 11:10:12,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:10:12,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 11:10:12,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702884395] [2020-10-13 11:10:12,317 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 11:10:12,317 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:10:12,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 11:10:12,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 11:10:12,318 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 5 states. [2020-10-13 11:10:12,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:10:12,424 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-10-13 11:10:12,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 11:10:12,425 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2020-10-13 11:10:12,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:10:12,426 INFO L225 Difference]: With dead ends: 65 [2020-10-13 11:10:12,426 INFO L226 Difference]: Without dead ends: 44 [2020-10-13 11:10:12,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 11:10:12,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-10-13 11:10:12,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2020-10-13 11:10:12,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-13 11:10:12,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-10-13 11:10:12,435 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-10-13 11:10:12,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:10:12,435 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-10-13 11:10:12,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 11:10:12,435 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-10-13 11:10:12,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-13 11:10:12,436 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:10:12,437 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:10:12,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-13 11:10:12,437 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:10:12,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:10:12,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1067646812, now seen corresponding path program 2 times [2020-10-13 11:10:12,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:10:12,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1247335778] [2020-10-13 11:10:12,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:10:12,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:12,457 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:12,476 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:12,797 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:12,797 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-13 11:10:12,798 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:10:12,798 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 346 [2020-10-13 11:10:12,798 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:12,798 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 11:10:12,799 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 11:10:12,799 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-13 11:10:12,799 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:10:12,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:10:12,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:12,838 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:12,840 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:12,840 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:10:12,841 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:10:12,841 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 11:10:12,841 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:12,841 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:10:12,842 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:10:12,842 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:10:12,842 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:10:12,845 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-13 11:10:12,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1247335778] [2020-10-13 11:10:12,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:10:12,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-13 11:10:12,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225376078] [2020-10-13 11:10:12,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-13 11:10:12,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:10:12,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-13 11:10:12,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-13 11:10:12,848 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 6 states. [2020-10-13 11:10:12,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:10:12,974 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2020-10-13 11:10:12,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-13 11:10:12,975 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2020-10-13 11:10:12,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:10:12,976 INFO L225 Difference]: With dead ends: 75 [2020-10-13 11:10:12,977 INFO L226 Difference]: Without dead ends: 52 [2020-10-13 11:10:12,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-13 11:10:12,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-10-13 11:10:12,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2020-10-13 11:10:12,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-10-13 11:10:12,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-10-13 11:10:12,985 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-10-13 11:10:12,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:10:12,985 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-10-13 11:10:12,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-13 11:10:12,986 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-10-13 11:10:12,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-10-13 11:10:12,987 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:10:12,987 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:10:12,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-13 11:10:12,988 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:10:12,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:10:12,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1245957476, now seen corresponding path program 3 times [2020-10-13 11:10:12,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:10:12,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [832079616] [2020-10-13 11:10:12,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:10:13,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:13,008 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:13,027 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:13,550 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:13,551 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-10-13 11:10:13,551 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:10:13,551 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 548 [2020-10-13 11:10:13,551 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:13,552 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-13 11:10:13,552 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 20 [2020-10-13 11:10:13,552 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-13 11:10:13,552 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:10:13,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:10:13,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:13,601 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:13,603 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:13,603 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:10:13,603 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:10:13,603 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 11:10:13,604 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:13,604 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:10:13,604 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:10:13,604 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:10:13,605 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:10:13,607 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-10-13 11:10:13,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [832079616] [2020-10-13 11:10:13,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:10:13,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-13 11:10:13,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614934253] [2020-10-13 11:10:13,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-13 11:10:13,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:10:13,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-13 11:10:13,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-13 11:10:13,610 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 7 states. [2020-10-13 11:10:13,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:10:13,742 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2020-10-13 11:10:13,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-13 11:10:13,742 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2020-10-13 11:10:13,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:10:13,743 INFO L225 Difference]: With dead ends: 85 [2020-10-13 11:10:13,743 INFO L226 Difference]: Without dead ends: 60 [2020-10-13 11:10:13,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-13 11:10:13,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-10-13 11:10:13,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-10-13 11:10:13,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-10-13 11:10:13,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-10-13 11:10:13,751 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-10-13 11:10:13,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:10:13,752 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-10-13 11:10:13,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-13 11:10:13,752 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-10-13 11:10:13,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-10-13 11:10:13,753 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:10:13,753 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:10:13,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-13 11:10:13,754 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:10:13,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:10:13,754 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 4 times [2020-10-13 11:10:13,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:10:13,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [256090271] [2020-10-13 11:10:13,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:10:13,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:13,772 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:13,788 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:14,644 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:14,645 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 48 [2020-10-13 11:10:14,645 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:10:14,645 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 878 [2020-10-13 11:10:14,646 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:14,646 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 11:10:14,646 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 22 [2020-10-13 11:10:14,646 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-13 11:10:14,646 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:10:14,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:10:14,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:10:14,712 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:10:14,714 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:10:14,714 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:10:14,714 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:10:14,714 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 11:10:14,715 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:10:14,715 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:10:14,715 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:10:14,715 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:10:14,716 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:10:14,719 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-10-13 11:10:14,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [256090271] [2020-10-13 11:10:14,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:10:14,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-13 11:10:14,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022359991] [2020-10-13 11:10:14,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-13 11:10:14,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:10:14,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-13 11:10:14,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 11:10:14,722 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 8 states. [2020-10-13 11:10:14,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:10:14,889 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-10-13 11:10:14,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-13 11:10:14,890 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2020-10-13 11:10:14,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:10:14,891 INFO L225 Difference]: With dead ends: 93 [2020-10-13 11:10:14,891 INFO L226 Difference]: Without dead ends: 66 [2020-10-13 11:10:14,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 11:10:14,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-10-13 11:10:14,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-10-13 11:10:14,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-13 11:10:14,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-10-13 11:10:14,899 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-10-13 11:10:14,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:10:14,899 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-10-13 11:10:14,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-13 11:10:14,900 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-10-13 11:10:14,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-10-13 11:10:14,901 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:10:14,901 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:10:14,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-13 11:10:14,902 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:10:14,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:10:14,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 5 times [2020-10-13 11:10:14,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:10:14,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1497437203] [2020-10-13 11:10:14,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:10:14,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-13 11:10:14,923 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-13 11:10:14,923 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-10-13 11:10:14,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-13 11:10:14,948 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 11:10:14 BoogieIcfgContainer [2020-10-13 11:10:14,948 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-13 11:10:14,951 INFO L168 Benchmark]: Toolchain (without parser) took 5057.02 ms. Allocated memory was 148.4 MB in the beginning and 276.3 MB in the end (delta: 127.9 MB). Free memory was 105.0 MB in the beginning and 238.9 MB in the end (delta: -133.9 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-10-13 11:10:14,952 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-10-13 11:10:14,953 INFO L168 Benchmark]: CACSL2BoogieTranslator took 393.84 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 104.8 MB in the beginning and 183.4 MB in the end (delta: -78.6 MB). Peak memory consumption was 19.6 MB. Max. memory is 7.1 GB. [2020-10-13 11:10:14,954 INFO L168 Benchmark]: Boogie Preprocessor took 47.79 ms. Allocated memory is still 205.0 MB. Free memory was 183.4 MB in the beginning and 181.1 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. [2020-10-13 11:10:14,955 INFO L168 Benchmark]: RCFGBuilder took 425.18 ms. Allocated memory is still 205.0 MB. Free memory was 181.1 MB in the beginning and 162.0 MB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. [2020-10-13 11:10:14,956 INFO L168 Benchmark]: TraceAbstraction took 4185.13 ms. Allocated memory was 205.0 MB in the beginning and 276.3 MB in the end (delta: 71.3 MB). Free memory was 161.3 MB in the beginning and 238.9 MB in the end (delta: -77.6 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-10-13 11:10:14,959 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 393.84 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 104.8 MB in the beginning and 183.4 MB in the end (delta: -78.6 MB). Peak memory consumption was 19.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 47.79 ms. Allocated memory is still 205.0 MB. Free memory was 183.4 MB in the beginning and 181.1 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 425.18 ms. Allocated memory is still 205.0 MB. Free memory was 181.1 MB in the beginning and 162.0 MB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4185.13 ms. Allocated memory was 205.0 MB in the beginning and 276.3 MB in the end (delta: 71.3 MB). Free memory was 161.3 MB in the beginning and 238.9 MB in the end (delta: -77.6 MB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 9]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 58. Possible FailurePath: [L20] char string_A[5], string_B[5]; [L21] int i, j, nc_A, nc_B, found=0; [L24] i=0 [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND FALSE !(i<5) [L26] EXPR string_A[5 -1] [L26] COND FALSE !(!(string_A[5 -1]=='\0')) [L28] i=0 [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND FALSE !(i<5) [L30] EXPR string_B[5 -1] [L30] COND FALSE !(!(string_B[5 -1]=='\0')) [L32] nc_A = 0 [L33] EXPR string_A[nc_A] [L33] COND FALSE !(string_A[nc_A]!='\0') [L36] nc_B = 0 [L37] EXPR string_B[nc_B] [L37] COND FALSE !(string_B[nc_B]!='\0') [L40] COND FALSE !(!(nc_B >= nc_A)) [L43] EXPR j=0 [L43] i=j=0 [L44] COND FALSE !((inc_B-1)<