./Ultimate.py --spec /storage/repos/svcomp/c/properties/unreach-call.prp --file /storage/repos/svcomp/c/loops/invert_string_false-unreach-call_true-termination.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2e94e6aa Calling Ultimate with: java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i /storage/repos/svcomp/c/loops/invert_string_false-unreach-call_true-termination.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 561472dda653ab23fa8eff641224e01683fc61ba ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.24-2e94e6a [2018-12-31 05:36:42,480 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-31 05:36:42,484 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-31 05:36:42,499 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-31 05:36:42,499 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-31 05:36:42,501 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-31 05:36:42,502 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-31 05:36:42,504 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-31 05:36:42,506 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-31 05:36:42,507 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-31 05:36:42,508 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-31 05:36:42,509 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-31 05:36:42,509 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-31 05:36:42,511 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-31 05:36:42,512 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-31 05:36:42,513 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-31 05:36:42,514 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-31 05:36:42,516 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-31 05:36:42,519 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-31 05:36:42,520 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-31 05:36:42,522 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-31 05:36:42,523 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-31 05:36:42,526 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-31 05:36:42,526 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-31 05:36:42,526 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-31 05:36:42,528 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-31 05:36:42,529 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-31 05:36:42,529 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-31 05:36:42,531 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-31 05:36:42,532 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-31 05:36:42,532 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-31 05:36:42,533 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-31 05:36:42,533 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-31 05:36:42,533 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-31 05:36:42,534 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-31 05:36:42,536 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-31 05:36:42,536 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2018-12-31 05:36:42,558 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-31 05:36:42,558 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-31 05:36:42,560 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-31 05:36:42,560 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-31 05:36:42,560 INFO L133 SettingsManager]: * Use SBE=true [2018-12-31 05:36:42,560 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-31 05:36:42,562 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-31 05:36:42,562 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-31 05:36:42,562 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-31 05:36:42,562 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-31 05:36:42,562 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-31 05:36:42,563 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-31 05:36:42,563 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-31 05:36:42,563 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-31 05:36:42,563 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-31 05:36:42,563 INFO L133 SettingsManager]: * Use constant arrays=true [2018-12-31 05:36:42,563 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-31 05:36:42,564 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-31 05:36:42,564 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-31 05:36:42,564 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-31 05:36:42,564 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-31 05:36:42,564 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-31 05:36:42,565 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-31 05:36:42,568 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-31 05:36:42,568 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-31 05:36:42,568 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-12-31 05:36:42,569 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-31 05:36:42,569 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-31 05:36:42,569 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 561472dda653ab23fa8eff641224e01683fc61ba [2018-12-31 05:36:42,638 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-31 05:36:42,656 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-31 05:36:42,664 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-31 05:36:42,666 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-31 05:36:42,666 INFO L276 PluginConnector]: CDTParser initialized [2018-12-31 05:36:42,667 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/svcomp/c/loops/invert_string_false-unreach-call_true-termination.i [2018-12-31 05:36:42,733 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/acb0fcb03/244bd02ec8114cac9426482fc31bfb7c/FLAG9eab1d496 [2018-12-31 05:36:43,209 INFO L307 CDTParser]: Found 1 translation units. [2018-12-31 05:36:43,209 INFO L161 CDTParser]: Scanning /storage/repos/svcomp/c/loops/invert_string_false-unreach-call_true-termination.i [2018-12-31 05:36:43,215 INFO L355 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/acb0fcb03/244bd02ec8114cac9426482fc31bfb7c/FLAG9eab1d496 [2018-12-31 05:36:43,594 INFO L363 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/acb0fcb03/244bd02ec8114cac9426482fc31bfb7c [2018-12-31 05:36:43,598 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-31 05:36:43,600 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-31 05:36:43,601 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-31 05:36:43,601 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-31 05:36:43,607 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-31 05:36:43,608 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.12 05:36:43" (1/1) ... [2018-12-31 05:36:43,611 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@179a4755 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43, skipping insertion in model container [2018-12-31 05:36:43,611 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.12 05:36:43" (1/1) ... [2018-12-31 05:36:43,619 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-31 05:36:43,638 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-31 05:36:43,850 INFO L204 PostProcessor]: Analyzing one entry point: main [2018-12-31 05:36:43,855 INFO L191 MainTranslator]: Completed pre-run [2018-12-31 05:36:43,882 INFO L204 PostProcessor]: Analyzing one entry point: main [2018-12-31 05:36:43,904 INFO L195 MainTranslator]: Completed translation [2018-12-31 05:36:43,904 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43 WrapperNode [2018-12-31 05:36:43,904 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-31 05:36:43,905 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-31 05:36:43,905 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-31 05:36:43,905 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-31 05:36:43,915 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43" (1/1) ... [2018-12-31 05:36:43,925 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43" (1/1) ... [2018-12-31 05:36:43,951 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-31 05:36:43,952 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-31 05:36:43,952 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-31 05:36:43,952 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-31 05:36:43,963 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43" (1/1) ... [2018-12-31 05:36:43,963 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43" (1/1) ... [2018-12-31 05:36:43,965 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43" (1/1) ... [2018-12-31 05:36:43,966 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43" (1/1) ... [2018-12-31 05:36:43,972 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43" (1/1) ... [2018-12-31 05:36:43,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43" (1/1) ... [2018-12-31 05:36:43,979 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43" (1/1) ... [2018-12-31 05:36:43,981 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-31 05:36:43,982 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-31 05:36:43,982 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-31 05:36:43,982 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-31 05:36:43,983 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2018-12-31 05:36:44,126 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-12-31 05:36:44,128 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-31 05:36:44,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-31 05:36:44,129 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-12-31 05:36:44,129 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2018-12-31 05:36:44,129 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-12-31 05:36:44,507 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-31 05:36:44,507 INFO L280 CfgBuilder]: Removed 9 assue(true) statements. [2018-12-31 05:36:44,507 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.12 05:36:44 BoogieIcfgContainer [2018-12-31 05:36:44,508 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-31 05:36:44,509 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-31 05:36:44,509 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-31 05:36:44,512 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-31 05:36:44,512 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.12 05:36:43" (1/3) ... [2018-12-31 05:36:44,513 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15527bcc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.12 05:36:44, skipping insertion in model container [2018-12-31 05:36:44,513 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 05:36:43" (2/3) ... [2018-12-31 05:36:44,514 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15527bcc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.12 05:36:44, skipping insertion in model container [2018-12-31 05:36:44,514 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.12 05:36:44" (3/3) ... [2018-12-31 05:36:44,516 INFO L112 eAbstractionObserver]: Analyzing ICFG invert_string_false-unreach-call_true-termination.i [2018-12-31 05:36:44,527 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-31 05:36:44,537 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-31 05:36:44,554 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-31 05:36:44,587 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-12-31 05:36:44,588 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-31 05:36:44,589 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-31 05:36:44,589 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-31 05:36:44,589 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-31 05:36:44,590 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-31 05:36:44,590 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-31 05:36:44,590 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-31 05:36:44,590 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-31 05:36:44,608 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-12-31 05:36:44,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-31 05:36:44,615 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 05:36:44,617 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 05:36:44,619 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 05:36:44,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 05:36:44,626 INFO L82 PathProgramCache]: Analyzing trace with hash -2016449835, now seen corresponding path program 1 times [2018-12-31 05:36:44,628 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 05:36:44,629 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 05:36:44,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:44,681 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 05:36:44,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:44,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 05:36:44,819 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-31 05:36:44,821 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-31 05:36:44,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-31 05:36:44,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-31 05:36:44,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-31 05:36:44,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-31 05:36:44,841 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 4 states. [2018-12-31 05:36:45,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-31 05:36:45,003 INFO L93 Difference]: Finished difference Result 33 states and 45 transitions. [2018-12-31 05:36:45,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-31 05:36:45,005 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-12-31 05:36:45,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-31 05:36:45,015 INFO L225 Difference]: With dead ends: 33 [2018-12-31 05:36:45,015 INFO L226 Difference]: Without dead ends: 15 [2018-12-31 05:36:45,018 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-31 05:36:45,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-31 05:36:45,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-12-31 05:36:45,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-31 05:36:45,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2018-12-31 05:36:45,050 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2018-12-31 05:36:45,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-31 05:36:45,050 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2018-12-31 05:36:45,051 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-31 05:36:45,051 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2018-12-31 05:36:45,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-31 05:36:45,051 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 05:36:45,052 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 05:36:45,052 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 05:36:45,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 05:36:45,052 INFO L82 PathProgramCache]: Analyzing trace with hash 867342291, now seen corresponding path program 1 times [2018-12-31 05:36:45,052 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 05:36:45,053 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 05:36:45,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:45,054 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 05:36:45,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:45,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 05:36:45,160 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-31 05:36:45,160 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-31 05:36:45,160 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-31 05:36:45,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-31 05:36:45,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-31 05:36:45,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-31 05:36:45,164 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2018-12-31 05:36:45,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-31 05:36:45,261 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2018-12-31 05:36:45,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-31 05:36:45,261 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-12-31 05:36:45,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-31 05:36:45,262 INFO L225 Difference]: With dead ends: 28 [2018-12-31 05:36:45,262 INFO L226 Difference]: Without dead ends: 17 [2018-12-31 05:36:45,263 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-31 05:36:45,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-12-31 05:36:45,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2018-12-31 05:36:45,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-12-31 05:36:45,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2018-12-31 05:36:45,268 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2018-12-31 05:36:45,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-31 05:36:45,269 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2018-12-31 05:36:45,269 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-31 05:36:45,269 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2018-12-31 05:36:45,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-31 05:36:45,270 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 05:36:45,270 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 05:36:45,270 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 05:36:45,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 05:36:45,270 INFO L82 PathProgramCache]: Analyzing trace with hash 2031054225, now seen corresponding path program 1 times [2018-12-31 05:36:45,272 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 05:36:45,272 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 05:36:45,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:45,273 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 05:36:45,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:45,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 05:36:45,773 WARN L181 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-12-31 05:36:46,308 WARN L181 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 22 [2018-12-31 05:36:46,358 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-31 05:36:46,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-31 05:36:46,358 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-31 05:36:46,370 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 05:36:46,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 05:36:46,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-31 05:36:46,458 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 1 [2018-12-31 05:36:46,459 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-12-31 05:36:46,476 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-31 05:36:46,477 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2018-12-31 05:36:46,690 WARN L181 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-12-31 05:36:47,016 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 17 [2018-12-31 05:36:47,022 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-12-31 05:36:47,023 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-31 05:36:47,029 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-31 05:36:47,051 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-31 05:36:47,052 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:25 [2018-12-31 05:36:47,208 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-31 05:36:47,228 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-31 05:36:47,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2018-12-31 05:36:47,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-31 05:36:47,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-31 05:36:47,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2018-12-31 05:36:47,232 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 16 states. [2018-12-31 05:36:48,021 WARN L181 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2018-12-31 05:36:48,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-31 05:36:48,299 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2018-12-31 05:36:48,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-31 05:36:48,300 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 13 [2018-12-31 05:36:48,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-31 05:36:48,302 INFO L225 Difference]: With dead ends: 38 [2018-12-31 05:36:48,302 INFO L226 Difference]: Without dead ends: 36 [2018-12-31 05:36:48,303 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=176, Invalid=474, Unknown=0, NotChecked=0, Total=650 [2018-12-31 05:36:48,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-31 05:36:48,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 25. [2018-12-31 05:36:48,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-31 05:36:48,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2018-12-31 05:36:48,311 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 13 [2018-12-31 05:36:48,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-31 05:36:48,312 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2018-12-31 05:36:48,312 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-31 05:36:48,312 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2018-12-31 05:36:48,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-31 05:36:48,313 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 05:36:48,313 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 05:36:48,313 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 05:36:48,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 05:36:48,314 INFO L82 PathProgramCache]: Analyzing trace with hash -628241457, now seen corresponding path program 2 times [2018-12-31 05:36:48,314 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 05:36:48,314 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 05:36:48,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:48,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 05:36:48,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:48,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 05:36:48,485 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-31 05:36:48,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-31 05:36:48,486 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-31 05:36:48,508 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-12-31 05:36:48,527 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-12-31 05:36:48,527 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-31 05:36:48,530 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-31 05:36:48,535 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-31 05:36:48,553 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-31 05:36:48,553 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2018-12-31 05:36:48,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-31 05:36:48,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-31 05:36:48,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-31 05:36:48,555 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 6 states. [2018-12-31 05:36:48,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-31 05:36:48,764 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2018-12-31 05:36:48,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-31 05:36:48,765 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2018-12-31 05:36:48,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-31 05:36:48,766 INFO L225 Difference]: With dead ends: 43 [2018-12-31 05:36:48,766 INFO L226 Difference]: Without dead ends: 36 [2018-12-31 05:36:48,767 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2018-12-31 05:36:48,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-31 05:36:48,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2018-12-31 05:36:48,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-31 05:36:48,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2018-12-31 05:36:48,775 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 15 [2018-12-31 05:36:48,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-31 05:36:48,775 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2018-12-31 05:36:48,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-31 05:36:48,776 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2018-12-31 05:36:48,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-31 05:36:48,776 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 05:36:48,776 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 05:36:48,777 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 05:36:48,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 05:36:48,777 INFO L82 PathProgramCache]: Analyzing trace with hash 1786824679, now seen corresponding path program 1 times [2018-12-31 05:36:48,777 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 05:36:48,777 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 05:36:48,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:48,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-31 05:36:48,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:48,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 05:36:48,982 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-31 05:36:48,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-31 05:36:48,982 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-31 05:36:49,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 05:36:49,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 05:36:49,030 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-31 05:36:49,072 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-31 05:36:49,092 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-31 05:36:49,092 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2018-12-31 05:36:49,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-31 05:36:49,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-31 05:36:49,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2018-12-31 05:36:49,093 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 10 states. [2018-12-31 05:36:49,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-31 05:36:49,253 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2018-12-31 05:36:49,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-31 05:36:49,259 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2018-12-31 05:36:49,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-31 05:36:49,260 INFO L225 Difference]: With dead ends: 49 [2018-12-31 05:36:49,261 INFO L226 Difference]: Without dead ends: 33 [2018-12-31 05:36:49,261 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2018-12-31 05:36:49,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-31 05:36:49,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 20. [2018-12-31 05:36:49,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-12-31 05:36:49,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2018-12-31 05:36:49,268 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2018-12-31 05:36:49,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-31 05:36:49,268 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2018-12-31 05:36:49,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-31 05:36:49,268 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2018-12-31 05:36:49,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-31 05:36:49,269 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 05:36:49,269 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 05:36:49,270 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 05:36:49,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 05:36:49,271 INFO L82 PathProgramCache]: Analyzing trace with hash -799235507, now seen corresponding path program 3 times [2018-12-31 05:36:49,271 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 05:36:49,271 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 05:36:49,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:49,272 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 05:36:49,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:49,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 05:36:49,887 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-31 05:36:49,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-31 05:36:49,888 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-31 05:36:49,896 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-31 05:36:49,927 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-31 05:36:49,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-31 05:36:49,930 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-31 05:36:50,040 WARN L181 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-12-31 05:36:50,047 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 1 [2018-12-31 05:36:50,047 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-12-31 05:36:50,053 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-31 05:36:50,054 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2018-12-31 05:36:50,208 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2018-12-31 05:36:50,217 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-12-31 05:36:50,218 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-31 05:36:50,234 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-31 05:36:50,257 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-31 05:36:50,258 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:31, output treesize:27 [2018-12-31 05:36:50,382 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-31 05:36:50,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-31 05:36:50,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2018-12-31 05:36:50,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-31 05:36:50,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-31 05:36:50,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2018-12-31 05:36:50,406 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 22 states. [2018-12-31 05:36:52,085 WARN L181 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 29 [2018-12-31 05:36:52,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-31 05:36:52,299 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2018-12-31 05:36:52,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-31 05:36:52,300 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 17 [2018-12-31 05:36:52,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-31 05:36:52,301 INFO L225 Difference]: With dead ends: 50 [2018-12-31 05:36:52,301 INFO L226 Difference]: Without dead ends: 48 [2018-12-31 05:36:52,303 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=353, Invalid=1287, Unknown=0, NotChecked=0, Total=1640 [2018-12-31 05:36:52,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-31 05:36:52,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 31. [2018-12-31 05:36:52,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-31 05:36:52,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2018-12-31 05:36:52,310 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 17 [2018-12-31 05:36:52,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-31 05:36:52,311 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2018-12-31 05:36:52,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-31 05:36:52,311 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2018-12-31 05:36:52,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-31 05:36:52,312 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 05:36:52,312 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 05:36:52,312 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 05:36:52,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 05:36:52,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1927655819, now seen corresponding path program 4 times [2018-12-31 05:36:52,313 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 05:36:52,313 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 05:36:52,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:52,314 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-31 05:36:52,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:52,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 05:36:52,396 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-31 05:36:52,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-31 05:36:52,396 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-31 05:36:52,409 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-31 05:36:52,434 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-31 05:36:52,434 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-31 05:36:52,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-31 05:36:52,485 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 28 [2018-12-31 05:36:52,490 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 16 [2018-12-31 05:36:52,490 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-31 05:36:52,507 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-31 05:36:52,514 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-31 05:36:52,515 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:24, output treesize:20 [2018-12-31 05:36:52,677 INFO L303 Elim1Store]: Index analysis took 128 ms [2018-12-31 05:36:52,846 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 37 [2018-12-31 05:36:52,862 INFO L701 Elim1Store]: detected not equals via solver [2018-12-31 05:36:52,863 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2018-12-31 05:36:52,863 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-31 05:36:52,889 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-31 05:36:52,899 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-31 05:36:52,899 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:37, output treesize:33 [2018-12-31 05:36:53,093 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-12-31 05:36:53,120 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-12-31 05:36:53,120 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 15 [2018-12-31 05:36:53,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-31 05:36:53,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-31 05:36:53,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2018-12-31 05:36:53,121 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 15 states. [2018-12-31 05:36:54,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-31 05:36:54,257 INFO L93 Difference]: Finished difference Result 77 states and 83 transitions. [2018-12-31 05:36:54,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-31 05:36:54,258 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 19 [2018-12-31 05:36:54,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-31 05:36:54,259 INFO L225 Difference]: With dead ends: 77 [2018-12-31 05:36:54,260 INFO L226 Difference]: Without dead ends: 67 [2018-12-31 05:36:54,261 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=182, Invalid=874, Unknown=0, NotChecked=0, Total=1056 [2018-12-31 05:36:54,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-31 05:36:54,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 42. [2018-12-31 05:36:54,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-31 05:36:54,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2018-12-31 05:36:54,273 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 19 [2018-12-31 05:36:54,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-31 05:36:54,273 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2018-12-31 05:36:54,273 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-31 05:36:54,273 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2018-12-31 05:36:54,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-31 05:36:54,274 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 05:36:54,274 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 05:36:54,274 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 05:36:54,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 05:36:54,275 INFO L82 PathProgramCache]: Analyzing trace with hash 980237987, now seen corresponding path program 2 times [2018-12-31 05:36:54,275 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 05:36:54,275 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 05:36:54,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:54,276 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-31 05:36:54,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 05:36:54,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-31 05:36:54,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-31 05:36:54,356 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2018-12-31 05:36:54,393 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 31.12 05:36:54 BoogieIcfgContainer [2018-12-31 05:36:54,393 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-31 05:36:54,393 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-31 05:36:54,394 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-31 05:36:54,394 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-31 05:36:54,394 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.12 05:36:44" (3/4) ... [2018-12-31 05:36:54,397 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-12-31 05:36:54,459 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2018-12-31 05:36:54,459 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-31 05:36:54,460 INFO L168 Benchmark]: Toolchain (without parser) took 10861.69 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 290.5 MB). Free memory was 944.7 MB in the beginning and 1.3 GB in the end (delta: -330.2 MB). There was no memory consumed. Max. memory is 11.5 GB. [2018-12-31 05:36:54,461 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 972.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-31 05:36:54,462 INFO L168 Benchmark]: CACSL2BoogieTranslator took 303.91 ms. Allocated memory is still 1.0 GB. Free memory was 944.7 MB in the beginning and 933.9 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-12-31 05:36:54,462 INFO L168 Benchmark]: Boogie Procedure Inliner took 46.21 ms. Allocated memory is still 1.0 GB. Free memory is still 933.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-31 05:36:54,463 INFO L168 Benchmark]: Boogie Preprocessor took 29.68 ms. Allocated memory is still 1.0 GB. Free memory was 933.9 MB in the beginning and 928.6 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2018-12-31 05:36:54,463 INFO L168 Benchmark]: RCFGBuilder took 525.96 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 123.7 MB). Free memory was 928.6 MB in the beginning and 1.1 GB in the end (delta: -165.5 MB). Peak memory consumption was 13.6 MB. Max. memory is 11.5 GB. [2018-12-31 05:36:54,464 INFO L168 Benchmark]: TraceAbstraction took 9884.61 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 166.7 MB). Free memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: -180.8 MB). There was no memory consumed. Max. memory is 11.5 GB. [2018-12-31 05:36:54,465 INFO L168 Benchmark]: Witness Printer took 65.86 ms. Allocated memory is still 1.3 GB. Free memory is still 1.3 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-31 05:36:54,468 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 972.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 303.91 ms. Allocated memory is still 1.0 GB. Free memory was 944.7 MB in the beginning and 933.9 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 46.21 ms. Allocated memory is still 1.0 GB. Free memory is still 933.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 29.68 ms. Allocated memory is still 1.0 GB. Free memory was 933.9 MB in the beginning and 928.6 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * RCFGBuilder took 525.96 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 123.7 MB). Free memory was 928.6 MB in the beginning and 1.1 GB in the end (delta: -165.5 MB). Peak memory consumption was 13.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 9884.61 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 166.7 MB). Free memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: -180.8 MB). There was no memory consumed. Max. memory is 11.5 GB. * Witness Printer took 65.86 ms. Allocated memory is still 1.3 GB. Free memory is still 1.3 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i