./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i25_o25_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i25_o25_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 980109aaf5797fcdc56688cd1127831babfd66a2 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-635dfa2 [2018-12-02 12:50:46,623 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-02 12:50:46,624 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-02 12:50:46,630 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-02 12:50:46,630 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-02 12:50:46,630 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-02 12:50:46,631 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-02 12:50:46,632 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-02 12:50:46,633 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-02 12:50:46,634 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-02 12:50:46,634 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-02 12:50:46,634 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-02 12:50:46,635 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-02 12:50:46,635 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-02 12:50:46,636 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-02 12:50:46,636 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-02 12:50:46,637 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-02 12:50:46,638 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-02 12:50:46,639 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-02 12:50:46,640 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-02 12:50:46,640 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-02 12:50:46,641 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-02 12:50:46,642 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-02 12:50:46,642 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-02 12:50:46,642 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-02 12:50:46,643 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-02 12:50:46,643 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-02 12:50:46,644 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-02 12:50:46,644 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-02 12:50:46,645 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-02 12:50:46,645 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-02 12:50:46,645 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-02 12:50:46,645 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-02 12:50:46,645 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-02 12:50:46,646 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-02 12:50:46,647 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-02 12:50:46,647 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-02 12:50:46,654 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-02 12:50:46,654 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-02 12:50:46,655 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-02 12:50:46,655 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-02 12:50:46,655 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-02 12:50:46,655 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-02 12:50:46,655 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-02 12:50:46,655 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-02 12:50:46,656 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-02 12:50:46,656 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-02 12:50:46,656 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-02 12:50:46,656 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-02 12:50:46,656 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-02 12:50:46,656 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-02 12:50:46,656 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-02 12:50:46,656 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-02 12:50:46,657 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-02 12:50:46,657 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-02 12:50:46,657 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-02 12:50:46,657 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-02 12:50:46,657 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-02 12:50:46,657 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-02 12:50:46,657 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-02 12:50:46,657 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-02 12:50:46,657 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-02 12:50:46,657 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-02 12:50:46,657 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-02 12:50:46,658 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-02 12:50:46,658 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-02 12:50:46,658 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-02 12:50:46,658 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-02 12:50:46,658 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-02 12:50:46,658 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-02 12:50:46,658 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-02 12:50:46,658 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-02 12:50:46,658 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-02 12:50:46,658 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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 -> /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan 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 -> Taipan 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 -> 980109aaf5797fcdc56688cd1127831babfd66a2 [2018-12-02 12:50:46,675 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-02 12:50:46,682 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-02 12:50:46,684 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-02 12:50:46,685 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-02 12:50:46,686 INFO L276 PluginConnector]: CDTParser initialized [2018-12-02 12:50:46,686 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/id_i25_o25_true-unreach-call_true-termination.c [2018-12-02 12:50:46,724 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/data/032387870/3a620cbab5cd436ea23b51660a8accdd/FLAG3a65c776d [2018-12-02 12:50:47,100 INFO L307 CDTParser]: Found 1 translation units. [2018-12-02 12:50:47,100 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/sv-benchmarks/c/recursive-simple/id_i25_o25_true-unreach-call_true-termination.c [2018-12-02 12:50:47,103 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/data/032387870/3a620cbab5cd436ea23b51660a8accdd/FLAG3a65c776d [2018-12-02 12:50:47,111 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/data/032387870/3a620cbab5cd436ea23b51660a8accdd [2018-12-02 12:50:47,113 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-02 12:50:47,114 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-02 12:50:47,115 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-02 12:50:47,115 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-02 12:50:47,117 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-02 12:50:47,117 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:50:47" (1/1) ... [2018-12-02 12:50:47,119 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2bf44b87 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47, skipping insertion in model container [2018-12-02 12:50:47,119 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:50:47" (1/1) ... [2018-12-02 12:50:47,123 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-02 12:50:47,131 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-02 12:50:47,210 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-02 12:50:47,212 INFO L191 MainTranslator]: Completed pre-run [2018-12-02 12:50:47,220 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-02 12:50:47,227 INFO L195 MainTranslator]: Completed translation [2018-12-02 12:50:47,228 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47 WrapperNode [2018-12-02 12:50:47,228 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-02 12:50:47,228 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-02 12:50:47,228 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-02 12:50:47,229 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-02 12:50:47,233 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47" (1/1) ... [2018-12-02 12:50:47,236 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47" (1/1) ... [2018-12-02 12:50:47,240 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-02 12:50:47,240 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-02 12:50:47,240 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-02 12:50:47,240 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-02 12:50:47,245 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47" (1/1) ... [2018-12-02 12:50:47,246 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47" (1/1) ... [2018-12-02 12:50:47,246 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47" (1/1) ... [2018-12-02 12:50:47,246 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47" (1/1) ... [2018-12-02 12:50:47,248 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47" (1/1) ... [2018-12-02 12:50:47,249 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47" (1/1) ... [2018-12-02 12:50:47,250 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47" (1/1) ... [2018-12-02 12:50:47,250 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-02 12:50:47,251 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-02 12:50:47,251 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-02 12:50:47,251 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-02 12:50:47,251 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/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 [2018-12-02 12:50:47,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-02 12:50:47,317 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-02 12:50:47,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-02 12:50:47,317 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-02 12:50:47,317 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-02 12:50:47,317 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-02 12:50:47,317 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-12-02 12:50:47,317 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-12-02 12:50:47,403 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-02 12:50:47,403 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-02 12:50:47,404 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:50:47 BoogieIcfgContainer [2018-12-02 12:50:47,404 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-02 12:50:47,404 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-02 12:50:47,404 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-02 12:50:47,407 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-02 12:50:47,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 12:50:47" (1/3) ... [2018-12-02 12:50:47,408 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45072128 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:50:47, skipping insertion in model container [2018-12-02 12:50:47,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:50:47" (2/3) ... [2018-12-02 12:50:47,408 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45072128 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:50:47, skipping insertion in model container [2018-12-02 12:50:47,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:50:47" (3/3) ... [2018-12-02 12:50:47,409 INFO L112 eAbstractionObserver]: Analyzing ICFG id_i25_o25_true-unreach-call_true-termination.c [2018-12-02 12:50:47,415 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-02 12:50:47,421 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-02 12:50:47,435 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-02 12:50:47,457 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-02 12:50:47,457 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-02 12:50:47,458 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-02 12:50:47,458 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-02 12:50:47,458 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-02 12:50:47,458 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-02 12:50:47,458 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-02 12:50:47,458 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-02 12:50:47,472 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-12-02 12:50:47,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-02 12:50:47,475 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:47,475 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:47,477 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:47,480 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:47,480 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-12-02 12:50:47,481 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:47,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:47,515 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:50:47,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:47,515 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:47,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:47,591 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-02 12:50:47,593 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-02 12:50:47,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-02 12:50:47,593 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-02 12:50:47,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-02 12:50:47,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-02 12:50:47,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-02 12:50:47,605 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-12-02 12:50:47,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:50:47,652 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-12-02 12:50:47,653 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-02 12:50:47,653 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-12-02 12:50:47,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:50:47,659 INFO L225 Difference]: With dead ends: 30 [2018-12-02 12:50:47,659 INFO L226 Difference]: Without dead ends: 18 [2018-12-02 12:50:47,661 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-02 12:50:47,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-12-02 12:50:47,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-12-02 12:50:47,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-02 12:50:47,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-12-02 12:50:47,684 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-12-02 12:50:47,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:50:47,684 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-12-02 12:50:47,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-02 12:50:47,685 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-12-02 12:50:47,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-02 12:50:47,686 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:47,686 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:47,686 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:47,687 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:47,687 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-12-02 12:50:47,687 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:47,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:47,688 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:50:47,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:47,688 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:47,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:47,726 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-02 12:50:47,727 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:47,727 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:50:47,727 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-12-02 12:50:47,728 INFO L205 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-12-02 12:50:47,747 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-02 12:50:47,747 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-02 12:50:47,836 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-02 12:50:47,837 INFO L272 AbstractInterpreter]: Visited 17 different actions 50 times. Never merged. Widened at 1 different actions 2 times. Performed 106 root evaluator evaluations with a maximum evaluation depth of 3. Performed 106 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-12-02 12:50:47,841 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:47,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-02 12:50:47,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:47,842 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/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 [2018-12-02 12:50:47,848 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:50:47,848 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 12:50:47,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:47,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:50:47,881 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-02 12:50:47,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:50:47,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-02 12:50:47,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:50:47,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-12-02 12:50:47,994 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:50:47,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-02 12:50:47,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-02 12:50:47,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-12-02 12:50:47,995 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-12-02 12:50:48,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:50:48,021 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-02 12:50:48,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-02 12:50:48,022 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-12-02 12:50:48,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:50:48,022 INFO L225 Difference]: With dead ends: 25 [2018-12-02 12:50:48,022 INFO L226 Difference]: Without dead ends: 21 [2018-12-02 12:50:48,023 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2018-12-02 12:50:48,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-02 12:50:48,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-02 12:50:48,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-02 12:50:48,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-12-02 12:50:48,026 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-12-02 12:50:48,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:50:48,027 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-12-02 12:50:48,027 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-02 12:50:48,027 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-12-02 12:50:48,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-12-02 12:50:48,027 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:48,027 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:48,027 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:48,028 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:48,028 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-12-02 12:50:48,028 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:48,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:48,028 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:50:48,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:48,029 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:48,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:48,071 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-02 12:50:48,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:48,071 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:50:48,071 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:50:48,071 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:50:48,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:48,072 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/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 [2018-12-02 12:50:48,079 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-02 12:50:48,079 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-02 12:50:48,087 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-02 12:50:48,087 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:50:48,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:50:48,094 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-02 12:50:48,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:50:48,240 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-02 12:50:48,260 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:50:48,261 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-12-02 12:50:48,261 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:50:48,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-02 12:50:48,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-02 12:50:48,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-12-02 12:50:48,261 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-12-02 12:50:48,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:50:48,294 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-12-02 12:50:48,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-02 12:50:48,295 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-12-02 12:50:48,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:50:48,295 INFO L225 Difference]: With dead ends: 28 [2018-12-02 12:50:48,295 INFO L226 Difference]: Without dead ends: 24 [2018-12-02 12:50:48,296 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-12-02 12:50:48,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-12-02 12:50:48,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-12-02 12:50:48,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-02 12:50:48,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-12-02 12:50:48,299 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-12-02 12:50:48,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:50:48,299 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-12-02 12:50:48,299 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-02 12:50:48,299 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-12-02 12:50:48,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-12-02 12:50:48,299 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:48,300 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:48,300 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:48,300 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:48,300 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-12-02 12:50:48,300 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:48,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:48,301 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:50:48,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:48,301 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:48,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:48,347 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-02 12:50:48,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:48,348 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:50:48,348 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:50:48,348 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:50:48,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:48,348 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/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 [2018-12-02 12:50:48,355 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-02 12:50:48,355 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-02 12:50:48,363 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-02 12:50:48,363 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:50:48,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:50:48,372 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-02 12:50:48,372 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:50:48,627 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-02 12:50:48,641 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:50:48,641 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2018-12-02 12:50:48,641 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:50:48,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-02 12:50:48,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-02 12:50:48,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-12-02 12:50:48,642 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-12-02 12:50:48,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:50:48,678 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-02 12:50:48,679 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-02 12:50:48,679 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-12-02 12:50:48,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:50:48,679 INFO L225 Difference]: With dead ends: 31 [2018-12-02 12:50:48,679 INFO L226 Difference]: Without dead ends: 27 [2018-12-02 12:50:48,680 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-12-02 12:50:48,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-02 12:50:48,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-02 12:50:48,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-02 12:50:48,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-12-02 12:50:48,682 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-12-02 12:50:48,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:50:48,682 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-12-02 12:50:48,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-02 12:50:48,683 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-12-02 12:50:48,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-02 12:50:48,683 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:48,683 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:48,683 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:48,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:48,683 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-12-02 12:50:48,684 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:48,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:48,684 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:50:48,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:48,684 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:48,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:48,731 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-02 12:50:48,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:48,731 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:50:48,731 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:50:48,731 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:50:48,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:48,731 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/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 [2018-12-02 12:50:48,737 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:50:48,737 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 12:50:48,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:48,748 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:50:48,756 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-02 12:50:48,756 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:50:49,155 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-12-02 12:50:49,169 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:50:49,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-12-02 12:50:49,169 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:50:49,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-02 12:50:49,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-02 12:50:49,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-12-02 12:50:49,170 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-12-02 12:50:49,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:50:49,212 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-12-02 12:50:49,212 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-02 12:50:49,213 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-12-02 12:50:49,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:50:49,213 INFO L225 Difference]: With dead ends: 34 [2018-12-02 12:50:49,213 INFO L226 Difference]: Without dead ends: 30 [2018-12-02 12:50:49,214 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-12-02 12:50:49,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-02 12:50:49,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-12-02 12:50:49,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-02 12:50:49,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-12-02 12:50:49,218 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-12-02 12:50:49,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:50:49,218 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-12-02 12:50:49,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-02 12:50:49,218 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-12-02 12:50:49,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-12-02 12:50:49,219 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:49,219 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:49,219 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:49,220 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:49,220 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-12-02 12:50:49,220 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:49,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:49,220 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:50:49,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:49,221 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:49,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:49,279 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-02 12:50:49,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:49,280 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:50:49,280 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:50:49,280 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:50:49,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:49,280 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/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 [2018-12-02 12:50:49,285 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-02 12:50:49,286 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-02 12:50:49,295 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-02 12:50:49,296 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:50:49,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:50:49,305 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-02 12:50:49,305 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:50:49,865 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-02 12:50:49,879 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:50:49,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2018-12-02 12:50:49,880 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:50:49,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-02 12:50:49,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-02 12:50:49,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-12-02 12:50:49,881 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-12-02 12:50:49,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:50:49,940 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-02 12:50:49,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-02 12:50:49,940 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-12-02 12:50:49,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:50:49,941 INFO L225 Difference]: With dead ends: 37 [2018-12-02 12:50:49,941 INFO L226 Difference]: Without dead ends: 33 [2018-12-02 12:50:49,941 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 73 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2018-12-02 12:50:49,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-02 12:50:49,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-02 12:50:49,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-02 12:50:49,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-12-02 12:50:49,945 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-12-02 12:50:49,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:50:49,945 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-12-02 12:50:49,945 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-02 12:50:49,945 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-12-02 12:50:49,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-02 12:50:49,946 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:49,946 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:49,946 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:49,946 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:49,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-12-02 12:50:49,946 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:49,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:49,947 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:50:49,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:49,947 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:49,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:50,005 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-12-02 12:50:50,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:50,005 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:50:50,006 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:50:50,006 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:50:50,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:50,006 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:50:50,012 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-02 12:50:50,012 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-02 12:50:50,020 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-02 12:50:50,020 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:50:50,022 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:50:50,029 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-12-02 12:50:50,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:50:50,824 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-12-02 12:50:50,840 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:50:50,840 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2018-12-02 12:50:50,840 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:50:50,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-02 12:50:50,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-02 12:50:50,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2018-12-02 12:50:50,841 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-12-02 12:50:50,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:50:50,908 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-12-02 12:50:50,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-02 12:50:50,909 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-12-02 12:50:50,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:50:50,909 INFO L225 Difference]: With dead ends: 40 [2018-12-02 12:50:50,909 INFO L226 Difference]: Without dead ends: 36 [2018-12-02 12:50:50,910 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 83 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2018-12-02 12:50:50,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-02 12:50:50,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-12-02 12:50:50,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-02 12:50:50,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-12-02 12:50:50,913 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-12-02 12:50:50,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:50:50,913 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-12-02 12:50:50,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-02 12:50:50,913 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-12-02 12:50:50,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-02 12:50:50,913 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:50,913 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:50,914 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:50,914 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:50,914 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-12-02 12:50:50,914 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:50,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:50,914 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:50:50,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:50,914 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:50,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:50,974 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-12-02 12:50:50,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:50,974 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:50:50,974 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:50:50,974 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:50:50,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:50,974 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:50:50,980 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:50:50,980 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 12:50:50,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:50,989 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:50:50,996 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-12-02 12:50:50,996 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:50:52,066 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-12-02 12:50:52,084 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:50:52,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2018-12-02 12:50:52,084 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:50:52,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-02 12:50:52,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-02 12:50:52,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-12-02 12:50:52,085 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-12-02 12:50:52,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:50:52,154 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-02 12:50:52,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-02 12:50:52,155 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-12-02 12:50:52,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:50:52,155 INFO L225 Difference]: With dead ends: 43 [2018-12-02 12:50:52,155 INFO L226 Difference]: Without dead ends: 39 [2018-12-02 12:50:52,156 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 93 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2018-12-02 12:50:52,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-02 12:50:52,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-02 12:50:52,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-02 12:50:52,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-12-02 12:50:52,159 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-12-02 12:50:52,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:50:52,159 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-12-02 12:50:52,159 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-02 12:50:52,159 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-12-02 12:50:52,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-12-02 12:50:52,159 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:52,159 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:52,159 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:52,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:52,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-12-02 12:50:52,160 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:52,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:52,160 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:50:52,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:52,160 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:52,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:52,236 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-12-02 12:50:52,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:52,236 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:50:52,237 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:50:52,237 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:50:52,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:52,237 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:50:52,243 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-02 12:50:52,243 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-02 12:50:52,256 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-02 12:50:52,256 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:50:52,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:50:52,269 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-12-02 12:50:52,269 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:50:53,733 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-12-02 12:50:53,748 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:50:53,748 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2018-12-02 12:50:53,748 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:50:53,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-02 12:50:53,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-02 12:50:53,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-02 12:50:53,749 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-12-02 12:50:53,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:50:53,817 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-12-02 12:50:53,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-02 12:50:53,818 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-12-02 12:50:53,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:50:53,818 INFO L225 Difference]: With dead ends: 46 [2018-12-02 12:50:53,818 INFO L226 Difference]: Without dead ends: 42 [2018-12-02 12:50:53,819 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 103 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2018-12-02 12:50:53,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-12-02 12:50:53,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-12-02 12:50:53,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-02 12:50:53,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-12-02 12:50:53,823 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-12-02 12:50:53,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:50:53,823 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-12-02 12:50:53,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-02 12:50:53,823 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-12-02 12:50:53,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-12-02 12:50:53,824 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:53,824 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:53,824 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:53,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:53,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-12-02 12:50:53,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:53,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:53,825 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:50:53,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:53,825 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:53,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:53,901 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-12-02 12:50:53,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:53,901 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:50:53,901 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:50:53,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:50:53,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:53,901 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:50:53,907 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-02 12:50:53,907 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-02 12:50:53,920 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-02 12:50:53,920 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:50:53,921 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:50:53,931 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-12-02 12:50:53,931 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:50:55,870 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-12-02 12:50:55,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:50:55,884 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-12-02 12:50:55,884 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:50:55,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-02 12:50:55,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-02 12:50:55,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-12-02 12:50:55,885 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-12-02 12:50:55,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:50:55,966 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-02 12:50:55,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-02 12:50:55,966 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-12-02 12:50:55,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:50:55,966 INFO L225 Difference]: With dead ends: 49 [2018-12-02 12:50:55,967 INFO L226 Difference]: Without dead ends: 45 [2018-12-02 12:50:55,967 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 113 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2018-12-02 12:50:55,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-02 12:50:55,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-02 12:50:55,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-02 12:50:55,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-12-02 12:50:55,970 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-12-02 12:50:55,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:50:55,970 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-12-02 12:50:55,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-02 12:50:55,970 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-12-02 12:50:55,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-12-02 12:50:55,971 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:55,971 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:55,971 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:55,971 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:55,971 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-12-02 12:50:55,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:55,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:55,972 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:50:55,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:55,972 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:55,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:56,061 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-12-02 12:50:56,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:56,061 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:50:56,061 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:50:56,061 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:50:56,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:56,061 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:50:56,067 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:50:56,067 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 12:50:56,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:56,079 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:50:56,088 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-12-02 12:50:56,088 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:50:58,782 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-12-02 12:50:58,806 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:50:58,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-12-02 12:50:58,806 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:50:58,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-02 12:50:58,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-02 12:50:58,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-12-02 12:50:58,807 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-12-02 12:50:58,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:50:58,909 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-12-02 12:50:58,909 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-02 12:50:58,909 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-12-02 12:50:58,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:50:58,910 INFO L225 Difference]: With dead ends: 52 [2018-12-02 12:50:58,910 INFO L226 Difference]: Without dead ends: 48 [2018-12-02 12:50:58,910 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 123 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2018-12-02 12:50:58,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-02 12:50:58,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-12-02 12:50:58,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-02 12:50:58,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-12-02 12:50:58,913 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-12-02 12:50:58,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:50:58,913 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-12-02 12:50:58,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-02 12:50:58,913 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-12-02 12:50:58,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-02 12:50:58,913 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:50:58,914 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:50:58,914 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:50:58,914 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:50:58,914 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2018-12-02 12:50:58,914 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:50:58,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:58,914 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:50:58,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:50:58,914 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:50:58,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:50:58,985 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-12-02 12:50:58,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:58,985 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:50:58,985 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:50:58,985 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:50:58,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:50:58,985 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:50:58,991 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-02 12:50:58,991 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-02 12:50:59,007 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-02 12:50:59,007 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:50:59,009 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:50:59,018 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-12-02 12:50:59,018 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:51:02,284 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-12-02 12:51:02,299 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:51:02,300 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-12-02 12:51:02,300 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:51:02,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-02 12:51:02,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-02 12:51:02,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-12-02 12:51:02,300 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-12-02 12:51:02,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:51:02,405 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-02 12:51:02,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-02 12:51:02,405 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-12-02 12:51:02,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:51:02,406 INFO L225 Difference]: With dead ends: 55 [2018-12-02 12:51:02,406 INFO L226 Difference]: Without dead ends: 51 [2018-12-02 12:51:02,406 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 133 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2018-12-02 12:51:02,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-02 12:51:02,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-02 12:51:02,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-02 12:51:02,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-12-02 12:51:02,410 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-12-02 12:51:02,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:51:02,410 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-12-02 12:51:02,410 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-02 12:51:02,410 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-12-02 12:51:02,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-12-02 12:51:02,411 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:51:02,411 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:51:02,411 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:51:02,411 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:51:02,411 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2018-12-02 12:51:02,411 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:51:02,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:02,411 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:51:02,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:02,412 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:51:02,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:51:02,501 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-12-02 12:51:02,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:02,502 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:51:02,502 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:51:02,502 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:51:02,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:02,502 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:51:02,508 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-02 12:51:02,508 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-02 12:51:02,520 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-02 12:51:02,520 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:51:02,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:51:02,531 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-12-02 12:51:02,531 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:51:07,502 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-12-02 12:51:07,525 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:51:07,526 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2018-12-02 12:51:07,526 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:51:07,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-02 12:51:07,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-02 12:51:07,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2018-12-02 12:51:07,526 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-12-02 12:51:07,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:51:07,641 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-12-02 12:51:07,641 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-02 12:51:07,642 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-12-02 12:51:07,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:51:07,642 INFO L225 Difference]: With dead ends: 58 [2018-12-02 12:51:07,642 INFO L226 Difference]: Without dead ends: 54 [2018-12-02 12:51:07,643 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 143 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2018-12-02 12:51:07,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-02 12:51:07,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-12-02 12:51:07,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-02 12:51:07,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-12-02 12:51:07,645 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-12-02 12:51:07,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:51:07,645 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-12-02 12:51:07,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-02 12:51:07,646 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-12-02 12:51:07,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-12-02 12:51:07,646 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:51:07,646 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:51:07,646 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:51:07,646 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:51:07,646 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2018-12-02 12:51:07,646 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:51:07,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:07,647 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:51:07,647 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:07,647 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:51:07,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:51:07,739 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-12-02 12:51:07,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:07,739 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:51:07,740 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:51:07,740 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:51:07,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:07,740 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:51:07,746 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:51:07,746 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 12:51:07,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:51:07,760 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:51:07,770 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-12-02 12:51:07,770 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:51:13,562 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-12-02 12:51:13,578 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:51:13,579 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2018-12-02 12:51:13,579 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:51:13,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-02 12:51:13,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-02 12:51:13,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2018-12-02 12:51:13,580 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-12-02 12:51:13,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:51:13,719 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-02 12:51:13,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-02 12:51:13,719 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-12-02 12:51:13,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:51:13,720 INFO L225 Difference]: With dead ends: 61 [2018-12-02 12:51:13,720 INFO L226 Difference]: Without dead ends: 57 [2018-12-02 12:51:13,720 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 153 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2018-12-02 12:51:13,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-02 12:51:13,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-02 12:51:13,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-02 12:51:13,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-12-02 12:51:13,723 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-12-02 12:51:13,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:51:13,723 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-12-02 12:51:13,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-02 12:51:13,723 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-12-02 12:51:13,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-02 12:51:13,724 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:51:13,724 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:51:13,724 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:51:13,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:51:13,724 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2018-12-02 12:51:13,724 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:51:13,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:13,725 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:51:13,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:13,725 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:51:13,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:51:13,861 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-12-02 12:51:13,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:13,861 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:51:13,862 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:51:13,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:51:13,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:13,862 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:51:13,869 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-02 12:51:13,869 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-02 12:51:13,890 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-02 12:51:13,890 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:51:13,892 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:51:13,902 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-12-02 12:51:13,902 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:51:15,442 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2018-12-02 12:51:20,811 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-12-02 12:51:20,827 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:51:20,827 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 35 [2018-12-02 12:51:20,827 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:51:20,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-02 12:51:20,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-02 12:51:20,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2018-12-02 12:51:20,828 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-12-02 12:51:20,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:51:20,968 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-12-02 12:51:20,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-02 12:51:20,969 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-12-02 12:51:20,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:51:20,969 INFO L225 Difference]: With dead ends: 64 [2018-12-02 12:51:20,969 INFO L226 Difference]: Without dead ends: 60 [2018-12-02 12:51:20,970 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 163 SyntacticMatches, 30 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=803, Invalid=1647, Unknown=0, NotChecked=0, Total=2450 [2018-12-02 12:51:20,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-12-02 12:51:20,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-12-02 12:51:20,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-02 12:51:20,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-12-02 12:51:20,972 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-12-02 12:51:20,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:51:20,972 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-12-02 12:51:20,972 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-02 12:51:20,973 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-12-02 12:51:20,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-12-02 12:51:20,973 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:51:20,973 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:51:20,973 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:51:20,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:51:20,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2018-12-02 12:51:20,974 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:51:20,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:20,974 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:51:20,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:20,974 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:51:20,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:51:21,079 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-12-02 12:51:21,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:21,079 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:51:21,079 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:51:21,079 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:51:21,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:21,079 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:51:21,085 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-02 12:51:21,085 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-02 12:51:21,100 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-02 12:51:21,100 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:51:21,102 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:51:21,113 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-12-02 12:51:21,113 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:51:28,961 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-12-02 12:51:28,976 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:51:28,977 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 35] total 37 [2018-12-02 12:51:28,977 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:51:28,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-02 12:51:28,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-02 12:51:28,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=988, Unknown=0, NotChecked=0, Total=1332 [2018-12-02 12:51:28,978 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 20 states. [2018-12-02 12:51:29,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:51:29,137 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-02 12:51:29,137 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-02 12:51:29,137 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 103 [2018-12-02 12:51:29,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:51:29,138 INFO L225 Difference]: With dead ends: 67 [2018-12-02 12:51:29,138 INFO L226 Difference]: Without dead ends: 63 [2018-12-02 12:51:29,139 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 173 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=904, Invalid=1852, Unknown=0, NotChecked=0, Total=2756 [2018-12-02 12:51:29,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-02 12:51:29,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-02 12:51:29,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-02 12:51:29,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-12-02 12:51:29,141 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-12-02 12:51:29,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:51:29,141 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-12-02 12:51:29,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-02 12:51:29,141 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-12-02 12:51:29,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-12-02 12:51:29,142 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:51:29,142 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:51:29,142 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:51:29,142 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:51:29,142 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2018-12-02 12:51:29,142 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:51:29,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:29,142 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:51:29,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:29,143 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:51:29,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:51:29,261 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-12-02 12:51:29,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:29,261 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:51:29,261 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:51:29,261 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:51:29,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:29,261 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:51:29,267 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:51:29,267 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 12:51:29,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:51:29,283 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:51:29,294 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-12-02 12:51:29,294 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:51:39,714 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-12-02 12:51:39,729 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:51:39,729 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 37] total 39 [2018-12-02 12:51:39,729 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:51:39,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-02 12:51:39,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-02 12:51:39,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1100, Unknown=0, NotChecked=0, Total=1482 [2018-12-02 12:51:39,730 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-12-02 12:51:39,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:51:39,901 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2018-12-02 12:51:39,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-02 12:51:39,901 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-12-02 12:51:39,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:51:39,902 INFO L225 Difference]: With dead ends: 70 [2018-12-02 12:51:39,902 INFO L226 Difference]: Without dead ends: 66 [2018-12-02 12:51:39,902 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 183 SyntacticMatches, 34 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1011, Invalid=2069, Unknown=0, NotChecked=0, Total=3080 [2018-12-02 12:51:39,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-12-02 12:51:39,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-12-02 12:51:39,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-02 12:51:39,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-12-02 12:51:39,905 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2018-12-02 12:51:39,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:51:39,905 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-12-02 12:51:39,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-02 12:51:39,905 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-12-02 12:51:39,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-12-02 12:51:39,905 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:51:39,906 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:51:39,906 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:51:39,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:51:39,906 INFO L82 PathProgramCache]: Analyzing trace with hash -464475409, now seen corresponding path program 17 times [2018-12-02 12:51:39,906 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:51:39,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:39,906 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:51:39,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:39,906 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:51:39,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:51:40,039 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-12-02 12:51:40,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:40,039 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:51:40,039 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:51:40,039 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:51:40,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:40,039 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:51:40,045 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-02 12:51:40,045 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-02 12:51:40,068 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-02 12:51:40,068 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:51:40,070 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:51:40,087 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-12-02 12:51:40,087 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:51:52,258 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-12-02 12:51:52,273 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:51:52,273 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 39] total 41 [2018-12-02 12:51:52,273 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:51:52,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-02 12:51:52,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-02 12:51:52,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=1218, Unknown=0, NotChecked=0, Total=1640 [2018-12-02 12:51:52,274 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 22 states. [2018-12-02 12:51:52,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:51:52,434 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-02 12:51:52,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-02 12:51:52,434 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2018-12-02 12:51:52,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:51:52,435 INFO L225 Difference]: With dead ends: 73 [2018-12-02 12:51:52,435 INFO L226 Difference]: Without dead ends: 69 [2018-12-02 12:51:52,436 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 193 SyntacticMatches, 36 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1124, Invalid=2298, Unknown=0, NotChecked=0, Total=3422 [2018-12-02 12:51:52,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-02 12:51:52,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-02 12:51:52,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-02 12:51:52,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-12-02 12:51:52,438 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2018-12-02 12:51:52,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:51:52,438 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-12-02 12:51:52,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-02 12:51:52,438 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-12-02 12:51:52,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-12-02 12:51:52,439 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:51:52,439 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:51:52,439 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:51:52,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:51:52,439 INFO L82 PathProgramCache]: Analyzing trace with hash 130115453, now seen corresponding path program 18 times [2018-12-02 12:51:52,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:51:52,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:52,439 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:51:52,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:51:52,440 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:51:52,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:51:52,593 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-12-02 12:51:52,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:52,593 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:51:52,593 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:51:52,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:51:52,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:51:52,593 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:51:52,600 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-02 12:51:52,600 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-02 12:51:52,618 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-02 12:51:52,618 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:51:52,620 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:51:52,633 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-12-02 12:51:52,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:52:07,579 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2018-12-02 12:52:07,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:52:07,594 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 41] total 43 [2018-12-02 12:52:07,594 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:52:07,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-02 12:52:07,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-02 12:52:07,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=1342, Unknown=0, NotChecked=0, Total=1806 [2018-12-02 12:52:07,594 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 23 states. [2018-12-02 12:52:07,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:52:07,811 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2018-12-02 12:52:07,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-02 12:52:07,812 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2018-12-02 12:52:07,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:52:07,812 INFO L225 Difference]: With dead ends: 76 [2018-12-02 12:52:07,812 INFO L226 Difference]: Without dead ends: 72 [2018-12-02 12:52:07,813 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 203 SyntacticMatches, 38 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1243, Invalid=2539, Unknown=0, NotChecked=0, Total=3782 [2018-12-02 12:52:07,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-12-02 12:52:07,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-12-02 12:52:07,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-12-02 12:52:07,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-12-02 12:52:07,815 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2018-12-02 12:52:07,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:52:07,815 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-12-02 12:52:07,815 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-02 12:52:07,816 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-12-02 12:52:07,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-12-02 12:52:07,816 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:52:07,816 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:52:07,816 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:52:07,816 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:52:07,816 INFO L82 PathProgramCache]: Analyzing trace with hash -2010955025, now seen corresponding path program 19 times [2018-12-02 12:52:07,816 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:52:07,817 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:52:07,817 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:52:07,817 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:52:07,817 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:52:07,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:52:07,981 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-12-02 12:52:07,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:52:07,981 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:52:07,981 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:52:07,981 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:52:07,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:52:07,981 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:52:07,987 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:52:07,987 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 12:52:08,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:52:08,004 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:52:08,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-12-02 12:52:08,024 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:52:09,954 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-02 12:52:27,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-12-02 12:52:27,124 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:52:27,124 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 43] total 45 [2018-12-02 12:52:27,124 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:52:27,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-02 12:52:27,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-02 12:52:27,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=1472, Unknown=0, NotChecked=0, Total=1980 [2018-12-02 12:52:27,125 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 24 states. [2018-12-02 12:52:27,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:52:27,307 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-02 12:52:27,307 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-02 12:52:27,307 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2018-12-02 12:52:27,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:52:27,307 INFO L225 Difference]: With dead ends: 79 [2018-12-02 12:52:27,307 INFO L226 Difference]: Without dead ends: 75 [2018-12-02 12:52:27,308 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 213 SyntacticMatches, 40 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1368, Invalid=2792, Unknown=0, NotChecked=0, Total=4160 [2018-12-02 12:52:27,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-02 12:52:27,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-02 12:52:27,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-02 12:52:27,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-12-02 12:52:27,310 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2018-12-02 12:52:27,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:52:27,310 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-12-02 12:52:27,310 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-02 12:52:27,311 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-12-02 12:52:27,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-12-02 12:52:27,311 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:52:27,311 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:52:27,311 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:52:27,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:52:27,311 INFO L82 PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 20 times [2018-12-02 12:52:27,311 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:52:27,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:52:27,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:52:27,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:52:27,312 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:52:27,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:52:27,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-12-02 12:52:27,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:52:27,475 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:52:27,475 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:52:27,475 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:52:27,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:52:27,475 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:52:27,481 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-02 12:52:27,481 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-02 12:52:27,509 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-02 12:52:27,509 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:52:27,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:52:27,526 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-12-02 12:52:27,526 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:52:46,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 1010 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-12-02 12:52:46,702 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:52:46,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 45] total 47 [2018-12-02 12:52:46,703 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:52:46,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-02 12:52:46,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-02 12:52:46,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=554, Invalid=1608, Unknown=0, NotChecked=0, Total=2162 [2018-12-02 12:52:46,704 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 25 states. [2018-12-02 12:52:46,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:52:46,947 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2018-12-02 12:52:46,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-02 12:52:46,948 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 133 [2018-12-02 12:52:46,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:52:46,948 INFO L225 Difference]: With dead ends: 82 [2018-12-02 12:52:46,948 INFO L226 Difference]: Without dead ends: 78 [2018-12-02 12:52:46,949 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 223 SyntacticMatches, 42 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1302 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1499, Invalid=3057, Unknown=0, NotChecked=0, Total=4556 [2018-12-02 12:52:46,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-12-02 12:52:46,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-12-02 12:52:46,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-02 12:52:46,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-12-02 12:52:46,952 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 133 [2018-12-02 12:52:46,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:52:46,952 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-12-02 12:52:46,952 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-02 12:52:46,953 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-12-02 12:52:46,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-12-02 12:52:46,953 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:52:46,953 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:52:46,954 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:52:46,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:52:46,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1226192145, now seen corresponding path program 21 times [2018-12-02 12:52:46,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:52:46,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:52:46,955 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:52:46,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:52:46,955 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:52:46,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:52:47,137 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-12-02 12:52:47,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:52:47,137 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:52:47,138 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:52:47,138 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:52:47,138 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:52:47,138 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:52:47,143 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-02 12:52:47,143 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-02 12:52:47,164 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-02 12:52:47,164 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:52:47,166 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:52:47,182 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-12-02 12:52:47,182 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:52:52,433 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-02 12:52:52,640 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2018-12-02 12:53:09,764 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 1113 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-12-02 12:53:09,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:53:09,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 47] total 49 [2018-12-02 12:53:09,779 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:53:09,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-02 12:53:09,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-02 12:53:09,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=602, Invalid=1750, Unknown=0, NotChecked=0, Total=2352 [2018-12-02 12:53:09,780 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 26 states. [2018-12-02 12:53:10,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:53:10,011 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-12-02 12:53:10,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-02 12:53:10,011 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 139 [2018-12-02 12:53:10,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:53:10,011 INFO L225 Difference]: With dead ends: 85 [2018-12-02 12:53:10,011 INFO L226 Difference]: Without dead ends: 81 [2018-12-02 12:53:10,012 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 233 SyntacticMatches, 44 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1430 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1636, Invalid=3334, Unknown=0, NotChecked=0, Total=4970 [2018-12-02 12:53:10,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-12-02 12:53:10,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-12-02 12:53:10,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-02 12:53:10,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-12-02 12:53:10,014 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 139 [2018-12-02 12:53:10,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:53:10,014 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-12-02 12:53:10,015 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-02 12:53:10,015 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-12-02 12:53:10,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-12-02 12:53:10,015 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:53:10,015 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:53:10,015 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:53:10,015 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:53:10,015 INFO L82 PathProgramCache]: Analyzing trace with hash 1155535485, now seen corresponding path program 22 times [2018-12-02 12:53:10,015 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:53:10,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:53:10,016 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:53:10,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:53:10,016 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:53:10,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:53:10,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-12-02 12:53:10,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:53:10,199 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:53:10,199 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:53:10,199 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:53:10,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:53:10,199 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:53:10,205 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:53:10,205 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 12:53:10,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:53:10,226 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:53:10,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-12-02 12:53:10,246 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:53:38,152 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 1221 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2018-12-02 12:53:38,167 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:53:38,167 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 49] total 51 [2018-12-02 12:53:38,167 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:53:38,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-02 12:53:38,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-02 12:53:38,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=1898, Unknown=0, NotChecked=0, Total=2550 [2018-12-02 12:53:38,168 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 27 states. [2018-12-02 12:53:38,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:53:38,424 INFO L93 Difference]: Finished difference Result 88 states and 89 transitions. [2018-12-02 12:53:38,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-02 12:53:38,424 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 145 [2018-12-02 12:53:38,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:53:38,425 INFO L225 Difference]: With dead ends: 88 [2018-12-02 12:53:38,425 INFO L226 Difference]: Without dead ends: 84 [2018-12-02 12:53:38,425 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 243 SyntacticMatches, 46 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1564 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1779, Invalid=3623, Unknown=0, NotChecked=0, Total=5402 [2018-12-02 12:53:38,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-12-02 12:53:38,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-12-02 12:53:38,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-02 12:53:38,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2018-12-02 12:53:38,427 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 145 [2018-12-02 12:53:38,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:53:38,428 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2018-12-02 12:53:38,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-02 12:53:38,428 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2018-12-02 12:53:38,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-12-02 12:53:38,428 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:53:38,428 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:53:38,428 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:53:38,428 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:53:38,429 INFO L82 PathProgramCache]: Analyzing trace with hash 478692079, now seen corresponding path program 23 times [2018-12-02 12:53:38,429 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:53:38,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:53:38,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:53:38,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:53:38,429 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:53:38,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:53:38,631 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-12-02 12:53:38,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:53:38,632 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:53:38,632 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:53:38,632 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:53:38,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:53:38,632 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:53:38,637 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-02 12:53:38,637 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-02 12:53:38,673 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-02 12:53:38,674 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:53:38,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:53:38,693 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-12-02 12:53:38,693 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:53:45,781 WARN L180 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 120 [2018-12-02 12:53:45,909 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 120 [2018-12-02 12:53:52,069 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2018-12-02 12:53:52,174 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2018-12-02 12:53:52,287 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2018-12-02 12:53:52,400 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2018-12-02 12:53:52,523 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-12-02 12:53:52,640 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-12-02 12:53:52,765 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-02 12:53:52,883 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-02 12:53:53,023 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-12-02 12:53:53,156 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-12-02 12:53:53,287 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-02 12:53:53,419 WARN L180 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-02 12:53:53,557 WARN L180 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2018-12-02 12:53:53,693 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2018-12-02 12:53:53,841 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-02 12:53:53,986 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-02 12:53:54,138 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2018-12-02 12:53:54,291 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2018-12-02 12:53:54,449 WARN L180 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-02 12:53:54,585 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-02 12:54:01,958 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2018-12-02 12:54:02,071 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2018-12-02 12:54:02,189 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-12-02 12:54:02,304 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-12-02 12:54:02,428 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-02 12:54:02,532 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2018-12-02 12:54:04,548 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-02 12:54:04,754 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2018-12-02 12:54:04,858 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2018-12-02 12:54:04,971 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2018-12-02 12:54:05,086 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2018-12-02 12:54:16,764 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 1334 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-12-02 12:54:16,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:54:16,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 51] total 53 [2018-12-02 12:54:16,779 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:54:16,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-02 12:54:16,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-02 12:54:16,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=704, Invalid=2052, Unknown=0, NotChecked=0, Total=2756 [2018-12-02 12:54:16,780 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 28 states. [2018-12-02 12:54:17,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:54:17,022 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-12-02 12:54:17,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-02 12:54:17,022 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 151 [2018-12-02 12:54:17,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:54:17,023 INFO L225 Difference]: With dead ends: 91 [2018-12-02 12:54:17,023 INFO L226 Difference]: Without dead ends: 87 [2018-12-02 12:54:17,023 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 253 SyntacticMatches, 48 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1704 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1928, Invalid=3924, Unknown=0, NotChecked=0, Total=5852 [2018-12-02 12:54:17,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-12-02 12:54:17,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-12-02 12:54:17,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-02 12:54:17,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-12-02 12:54:17,025 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 151 [2018-12-02 12:54:17,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:54:17,026 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-12-02 12:54:17,026 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-02 12:54:17,026 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-12-02 12:54:17,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-12-02 12:54:17,026 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:54:17,026 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:54:17,026 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:54:17,026 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:54:17,027 INFO L82 PathProgramCache]: Analyzing trace with hash -414572547, now seen corresponding path program 24 times [2018-12-02 12:54:17,027 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:54:17,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:54:17,027 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:54:17,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:54:17,027 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:54:17,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:54:17,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-12-02 12:54:17,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:54:17,233 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:54:17,233 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:54:17,233 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:54:17,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:54:17,233 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:54:17,239 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-02 12:54:17,239 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-02 12:54:17,260 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-02 12:54:17,260 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-02 12:54:17,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:54:17,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-12-02 12:54:17,289 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:54:19,707 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2018-12-02 12:54:19,814 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2018-12-02 12:54:19,934 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-02 12:54:24,785 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 120 [2018-12-02 12:54:24,911 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2018-12-02 12:54:25,044 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2018-12-02 12:54:25,179 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2018-12-02 12:54:25,311 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2018-12-02 12:54:33,706 WARN L180 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-02 12:54:33,825 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2018-12-02 12:54:33,968 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2018-12-02 12:54:34,105 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2018-12-02 12:54:34,212 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2018-12-02 12:54:34,720 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 110 [2018-12-02 12:54:54,167 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 1452 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2018-12-02 12:54:54,184 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:54:54,185 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 53] total 54 [2018-12-02 12:54:54,185 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:54:54,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-02 12:54:54,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-02 12:54:54,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=755, Invalid=2107, Unknown=0, NotChecked=0, Total=2862 [2018-12-02 12:54:54,186 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 29 states. [2018-12-02 12:54:54,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:54:54,550 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2018-12-02 12:54:54,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-02 12:54:54,551 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 157 [2018-12-02 12:54:54,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:54:54,552 INFO L225 Difference]: With dead ends: 94 [2018-12-02 12:54:54,552 INFO L226 Difference]: Without dead ends: 90 [2018-12-02 12:54:54,552 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 263 SyntacticMatches, 51 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1776 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2080, Invalid=4082, Unknown=0, NotChecked=0, Total=6162 [2018-12-02 12:54:54,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-12-02 12:54:54,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-12-02 12:54:54,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-12-02 12:54:54,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-12-02 12:54:54,555 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 157 [2018-12-02 12:54:54,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:54:54,555 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-12-02 12:54:54,555 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-02 12:54:54,555 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-12-02 12:54:54,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-12-02 12:54:54,556 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:54:54,556 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:54:54,556 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:54:54,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:54:54,556 INFO L82 PathProgramCache]: Analyzing trace with hash -975000849, now seen corresponding path program 25 times [2018-12-02 12:54:54,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:54:54,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:54:54,557 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-02 12:54:54,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:54:54,557 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:54:54,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:54:55,453 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-12-02 12:54:55,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:54:55,453 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-02 12:54:55,453 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-02 12:54:55,453 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-02 12:54:55,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-02 12:54:55,453 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-02 12:54:55,459 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:54:55,459 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-02 12:54:55,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:54:55,484 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-02 12:54:55,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-12-02 12:54:55,544 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-02 12:54:57,734 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-12-02 12:54:57,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-02 12:54:57,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 55 [2018-12-02 12:54:57,750 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-02 12:54:57,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-02 12:54:57,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-02 12:54:57,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=2863, Unknown=0, NotChecked=0, Total=2970 [2018-12-02 12:54:57,750 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 55 states. [2018-12-02 12:54:58,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:54:58,355 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2018-12-02 12:54:58,355 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-02 12:54:58,355 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 163 [2018-12-02 12:54:58,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:54:58,356 INFO L225 Difference]: With dead ends: 97 [2018-12-02 12:54:58,356 INFO L226 Difference]: Without dead ends: 93 [2018-12-02 12:54:58,357 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 323 SyntacticMatches, 4 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=107, Invalid=2863, Unknown=0, NotChecked=0, Total=2970 [2018-12-02 12:54:58,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-12-02 12:54:58,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-12-02 12:54:58,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-02 12:54:58,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2018-12-02 12:54:58,361 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 163 [2018-12-02 12:54:58,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:54:58,361 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2018-12-02 12:54:58,361 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-02 12:54:58,361 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2018-12-02 12:54:58,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-12-02 12:54:58,362 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 12:54:58,363 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 12:54:58,363 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-02 12:54:58,363 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 12:54:58,363 INFO L82 PathProgramCache]: Analyzing trace with hash -1466565251, now seen corresponding path program 26 times [2018-12-02 12:54:58,363 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 12:54:58,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:54:58,364 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 12:54:58,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 12:54:58,364 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 12:54:58,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 12:54:58,635 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1027 proven. 0 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-12-02 12:54:58,635 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-02 12:54:58,636 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2018-12-02 12:54:58,636 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-02 12:54:58,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-02 12:54:58,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-02 12:54:58,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=520, Unknown=0, NotChecked=0, Total=930 [2018-12-02 12:54:58,636 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand 31 states. [2018-12-02 12:54:58,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 12:54:58,843 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-02 12:54:58,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-02 12:54:58,844 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 169 [2018-12-02 12:54:58,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 12:54:58,844 INFO L225 Difference]: With dead ends: 93 [2018-12-02 12:54:58,844 INFO L226 Difference]: Without dead ends: 0 [2018-12-02 12:54:58,844 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=1220, Invalid=2086, Unknown=0, NotChecked=0, Total=3306 [2018-12-02 12:54:58,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-12-02 12:54:58,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-12-02 12:54:58,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-12-02 12:54:58,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-12-02 12:54:58,845 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 169 [2018-12-02 12:54:58,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 12:54:58,845 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-12-02 12:54:58,845 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-02 12:54:58,845 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-12-02 12:54:58,845 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-02 12:54:58,848 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-12-02 12:54:58,860 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-12-02 12:54:58,860 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-12-02 12:54:58,860 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-12-02 12:54:58,860 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-12-02 12:54:58,860 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-12-02 12:54:58,860 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-12-02 12:54:58,860 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2018-12-02 12:54:58,860 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 9 15) the Hoare annotation is: true [2018-12-02 12:54:58,860 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 9 15) no Hoare annotation was computed. [2018-12-02 12:54:58,860 INFO L448 ceAbstractionStarter]: For program point L13(line 13) no Hoare annotation was computed. [2018-12-02 12:54:58,860 INFO L448 ceAbstractionStarter]: For program point L12(lines 12 14) no Hoare annotation was computed. [2018-12-02 12:54:58,861 INFO L444 ceAbstractionStarter]: At program point L11(line 11) the Hoare annotation is: (and (<= main_~input~0 25) (<= 25 main_~input~0)) [2018-12-02 12:54:58,861 INFO L448 ceAbstractionStarter]: For program point L11-1(line 11) no Hoare annotation was computed. [2018-12-02 12:54:58,861 INFO L448 ceAbstractionStarter]: For program point L12-2(lines 9 15) no Hoare annotation was computed. [2018-12-02 12:54:58,861 INFO L448 ceAbstractionStarter]: For program point idFINAL(lines 4 7) no Hoare annotation was computed. [2018-12-02 12:54:58,861 INFO L448 ceAbstractionStarter]: For program point idEXIT(lines 4 7) no Hoare annotation was computed. [2018-12-02 12:54:58,861 INFO L451 ceAbstractionStarter]: At program point idENTRY(lines 4 7) the Hoare annotation is: true [2018-12-02 12:54:58,861 INFO L444 ceAbstractionStarter]: At program point L6(line 6) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2018-12-02 12:54:58,861 INFO L448 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-12-02 12:54:58,861 INFO L448 ceAbstractionStarter]: For program point L6-1(line 6) no Hoare annotation was computed. [2018-12-02 12:54:58,862 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.12 12:54:58 BoogieIcfgContainer [2018-12-02 12:54:58,862 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-02 12:54:58,863 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-02 12:54:58,863 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-02 12:54:58,863 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-02 12:54:58,863 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:50:47" (3/4) ... [2018-12-02 12:54:58,865 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-12-02 12:54:58,869 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-12-02 12:54:58,869 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-12-02 12:54:58,869 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id [2018-12-02 12:54:58,871 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-12-02 12:54:58,871 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-12-02 12:54:58,871 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-12-02 12:54:58,892 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_376c7250-3b3c-4fea-aed1-0aa1a2f0ed93/bin-2019/utaipan/witness.graphml [2018-12-02 12:54:58,893 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-02 12:54:58,893 INFO L168 Benchmark]: Toolchain (without parser) took 251779.54 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.8 MB). Free memory was 958.8 MB in the beginning and 751.9 MB in the end (delta: 206.9 MB). Peak memory consumption was 342.7 MB. Max. memory is 11.5 GB. [2018-12-02 12:54:58,893 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-02 12:54:58,894 INFO L168 Benchmark]: CACSL2BoogieTranslator took 113.47 ms. Allocated memory is still 1.0 GB. Free memory was 958.8 MB in the beginning and 948.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-12-02 12:54:58,894 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.49 ms. Allocated memory is still 1.0 GB. Free memory is still 948.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-02 12:54:58,894 INFO L168 Benchmark]: Boogie Preprocessor took 10.38 ms. Allocated memory is still 1.0 GB. Free memory is still 948.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-02 12:54:58,894 INFO L168 Benchmark]: RCFGBuilder took 153.14 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 112.2 MB). Free memory was 948.1 MB in the beginning and 1.1 GB in the end (delta: -143.6 MB). Peak memory consumption was 18.4 MB. Max. memory is 11.5 GB. [2018-12-02 12:54:58,894 INFO L168 Benchmark]: TraceAbstraction took 251458.37 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 23.6 MB). Free memory was 1.1 GB in the beginning and 759.4 MB in the end (delta: 332.4 MB). Peak memory consumption was 356.0 MB. Max. memory is 11.5 GB. [2018-12-02 12:54:58,894 INFO L168 Benchmark]: Witness Printer took 29.84 ms. Allocated memory is still 1.2 GB. Free memory was 759.4 MB in the beginning and 759.4 MB in the end (delta: 2.1 kB). Peak memory consumption was 2.1 kB. Max. memory is 11.5 GB. [2018-12-02 12:54:58,896 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 113.47 ms. Allocated memory is still 1.0 GB. Free memory was 958.8 MB in the beginning and 948.1 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 11.49 ms. Allocated memory is still 1.0 GB. Free memory is still 948.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.38 ms. Allocated memory is still 1.0 GB. Free memory is still 948.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 153.14 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 112.2 MB). Free memory was 948.1 MB in the beginning and 1.1 GB in the end (delta: -143.6 MB). Peak memory consumption was 18.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 251458.37 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 23.6 MB). Free memory was 1.1 GB in the beginning and 759.4 MB in the end (delta: 332.4 MB). Peak memory consumption was 356.0 MB. Max. memory is 11.5 GB. * Witness Printer took 29.84 ms. Allocated memory is still 1.2 GB. Free memory was 759.4 MB in the beginning and 759.4 MB in the end (delta: 2.1 kB). Peak memory consumption was 2.1 kB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 251.4s OverallTime, 27 OverallIterations, 27 TraceHistogramMax, 4.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 455 SDtfs, 782 SDslu, 5882 SDs, 0 SdLazy, 3946 SolverSat, 34 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5714 GetRequests, 3905 SyntacticMatches, 653 SemanticMatches, 1156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16499 ImplicationChecksByTransitivity, 12.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=93occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 27 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 19 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 245.5s InterpolantComputationTime, 4732 NumberOfCodeBlocks, 4732 NumberOfCodeBlocksAsserted, 160 NumberOfCheckSat, 6930 ConstructedInterpolants, 0 QuantifiedInterpolants, 2364216 SizeOfPredicates, 349 NumberOfNonLiveVariables, 5325 ConjunctsInSsa, 803 ConjunctsInUnsatCore, 77 InterpolantComputations, 2 PerfectInterpolantSequences, 22504/52754 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...