./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/id_o10_false-unreach-call_true-termination_true-no-overflow.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 1dbac8bc Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_o10_false-unreach-call_true-termination_true-no-overflow.c -s /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/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 0c292d0c9d9c055df9398b3303a92d6621b60758 .............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-1dbac8b [2018-10-26 19:12:36,989 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-26 19:12:36,991 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-26 19:12:37,002 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-26 19:12:37,003 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-26 19:12:37,004 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-26 19:12:37,005 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-26 19:12:37,007 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-26 19:12:37,009 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-26 19:12:37,010 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-26 19:12:37,011 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-26 19:12:37,011 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-26 19:12:37,012 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-26 19:12:37,013 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-26 19:12:37,014 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-26 19:12:37,015 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-26 19:12:37,016 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-26 19:12:37,018 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-26 19:12:37,020 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-26 19:12:37,022 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-26 19:12:37,023 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-26 19:12:37,024 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-26 19:12:37,026 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-26 19:12:37,027 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-26 19:12:37,027 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-26 19:12:37,028 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-26 19:12:37,029 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-26 19:12:37,030 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-26 19:12:37,031 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-26 19:12:37,032 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-26 19:12:37,033 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-26 19:12:37,033 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-26 19:12:37,034 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-26 19:12:37,034 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-26 19:12:37,035 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-26 19:12:37,036 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-26 19:12:37,037 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-26 19:12:37,050 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-26 19:12:37,051 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-26 19:12:37,051 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-26 19:12:37,052 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-26 19:12:37,052 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-26 19:12:37,052 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-26 19:12:37,053 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-26 19:12:37,053 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-26 19:12:37,053 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-26 19:12:37,053 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-26 19:12:37,053 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-26 19:12:37,054 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-26 19:12:37,054 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-26 19:12:37,054 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-26 19:12:37,055 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-26 19:12:37,055 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-26 19:12:37,055 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-26 19:12:37,055 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-26 19:12:37,055 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-26 19:12:37,056 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-26 19:12:37,056 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-26 19:12:37,056 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-26 19:12:37,056 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-26 19:12:37,058 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-26 19:12:37,058 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-26 19:12:37,059 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-26 19:12:37,059 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-26 19:12:37,059 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-26 19:12:37,059 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-26 19:12:37,059 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-26 19:12:37,059 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-26 19:12:37,060 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-26 19:12:37,060 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-26 19:12:37,060 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-26 19:12:37,060 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_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/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 -> 0c292d0c9d9c055df9398b3303a92d6621b60758 [2018-10-26 19:12:37,093 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-26 19:12:37,105 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-26 19:12:37,108 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-26 19:12:37,110 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-26 19:12:37,110 INFO L276 PluginConnector]: CDTParser initialized [2018-10-26 19:12:37,111 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/id_o10_false-unreach-call_true-termination_true-no-overflow.c [2018-10-26 19:12:37,167 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/bin-2019/utaipan/data/c29ee82c9/2f1001fed10940f1983317f043d66705/FLAGc744828f0 [2018-10-26 19:12:37,526 INFO L298 CDTParser]: Found 1 translation units. [2018-10-26 19:12:37,527 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/sv-benchmarks/c/recursive-simple/id_o10_false-unreach-call_true-termination_true-no-overflow.c [2018-10-26 19:12:37,532 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/bin-2019/utaipan/data/c29ee82c9/2f1001fed10940f1983317f043d66705/FLAGc744828f0 [2018-10-26 19:12:37,544 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/bin-2019/utaipan/data/c29ee82c9/2f1001fed10940f1983317f043d66705 [2018-10-26 19:12:37,547 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-26 19:12:37,548 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-26 19:12:37,549 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-26 19:12:37,549 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-26 19:12:37,553 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-26 19:12:37,554 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 07:12:37" (1/1) ... [2018-10-26 19:12:37,557 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@235b504 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37, skipping insertion in model container [2018-10-26 19:12:37,558 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 07:12:37" (1/1) ... [2018-10-26 19:12:37,569 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-26 19:12:37,585 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-26 19:12:37,727 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 19:12:37,730 INFO L189 MainTranslator]: Completed pre-run [2018-10-26 19:12:37,745 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 19:12:37,756 INFO L193 MainTranslator]: Completed translation [2018-10-26 19:12:37,757 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37 WrapperNode [2018-10-26 19:12:37,757 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-26 19:12:37,758 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-26 19:12:37,758 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-26 19:12:37,758 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-26 19:12:37,767 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37" (1/1) ... [2018-10-26 19:12:37,773 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37" (1/1) ... [2018-10-26 19:12:37,779 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-26 19:12:37,779 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-26 19:12:37,779 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-26 19:12:37,779 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-26 19:12:37,790 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37" (1/1) ... [2018-10-26 19:12:37,790 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37" (1/1) ... [2018-10-26 19:12:37,790 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37" (1/1) ... [2018-10-26 19:12:37,791 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37" (1/1) ... [2018-10-26 19:12:37,794 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37" (1/1) ... [2018-10-26 19:12:37,797 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37" (1/1) ... [2018-10-26 19:12:37,798 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37" (1/1) ... [2018-10-26 19:12:37,799 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-26 19:12:37,799 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-26 19:12:37,799 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-26 19:12:37,800 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-26 19:12:37,801 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/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 [2018-10-26 19:12:37,957 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-26 19:12:37,957 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-26 19:12:37,957 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-26 19:12:37,957 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-26 19:12:37,958 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-26 19:12:37,958 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-26 19:12:37,958 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-10-26 19:12:37,958 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-10-26 19:12:38,212 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-26 19:12:38,212 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 07:12:38 BoogieIcfgContainer [2018-10-26 19:12:38,213 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-26 19:12:38,213 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-26 19:12:38,214 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-26 19:12:38,218 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-26 19:12:38,218 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.10 07:12:37" (1/3) ... [2018-10-26 19:12:38,219 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7957c2b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 07:12:38, skipping insertion in model container [2018-10-26 19:12:38,219 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 07:12:37" (2/3) ... [2018-10-26 19:12:38,220 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7957c2b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 07:12:38, skipping insertion in model container [2018-10-26 19:12:38,220 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 07:12:38" (3/3) ... [2018-10-26 19:12:38,223 INFO L112 eAbstractionObserver]: Analyzing ICFG id_o10_false-unreach-call_true-termination_true-no-overflow.c [2018-10-26 19:12:38,233 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-26 19:12:38,241 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-26 19:12:38,258 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-26 19:12:38,291 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-26 19:12:38,292 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-26 19:12:38,292 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-26 19:12:38,292 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-26 19:12:38,293 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-26 19:12:38,293 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-26 19:12:38,293 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-26 19:12:38,293 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-26 19:12:38,311 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-26 19:12:38,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-26 19:12:38,317 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:12:38,318 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:12:38,321 INFO L424 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:12:38,329 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:38,329 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-10-26 19:12:38,332 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:12:38,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:38,386 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:12:38,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:38,386 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:12:38,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:38,651 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-10-26 19:12:38,756 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 19:12:38,758 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 19:12:38,759 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-26 19:12:38,759 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-26 19:12:38,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-26 19:12:38,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-26 19:12:38,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-26 19:12:38,776 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-10-26 19:12:38,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:12:38,841 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2018-10-26 19:12:38,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-26 19:12:38,842 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-10-26 19:12:38,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:12:38,852 INFO L225 Difference]: With dead ends: 32 [2018-10-26 19:12:38,853 INFO L226 Difference]: Without dead ends: 18 [2018-10-26 19:12:38,856 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-26 19:12:38,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-26 19:12:38,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-26 19:12:38,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-26 19:12:38,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-26 19:12:38,898 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-26 19:12:38,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:12:38,898 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-26 19:12:38,898 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-26 19:12:38,898 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-26 19:12:38,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-26 19:12:38,901 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:12:38,901 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:12:38,901 INFO L424 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:12:38,902 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:38,902 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-10-26 19:12:38,902 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:12:38,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:38,903 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:12:38,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:38,903 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:12:38,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:39,090 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 19:12:39,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:39,091 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:12:39,092 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-10-26 19:12:39,093 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-10-26 19:12:39,135 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-26 19:12:39,135 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-26 19:12:39,242 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-26 19:12:39,339 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-26 19:12:39,341 INFO L272 AbstractInterpreter]: Visited 16 different actions 56 times. Merged at 5 different actions 21 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-10-26 19:12:39,354 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:39,355 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-26 19:12:39,451 INFO L227 lantSequenceWeakener]: Weakened 8 states. On average, predicates are now at 72.92% of their original sizes. [2018-10-26 19:12:39,451 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-10-26 19:12:39,705 INFO L415 sIntCurrentIteration]: We unified 18 AI predicates to 18 [2018-10-26 19:12:39,705 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-26 19:12:39,706 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-26 19:12:39,706 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [7] total 13 [2018-10-26 19:12:39,706 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-26 19:12:39,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-26 19:12:39,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-26 19:12:39,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2018-10-26 19:12:39,708 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 8 states. [2018-10-26 19:12:39,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:12:39,953 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-10-26 19:12:39,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-26 19:12:39,953 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2018-10-26 19:12:39,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:12:39,954 INFO L225 Difference]: With dead ends: 25 [2018-10-26 19:12:39,954 INFO L226 Difference]: Without dead ends: 21 [2018-10-26 19:12:39,955 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2018-10-26 19:12:39,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-26 19:12:39,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-26 19:12:39,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-26 19:12:39,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-26 19:12:39,960 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-10-26 19:12:39,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:12:39,961 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-26 19:12:39,961 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-26 19:12:39,961 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-26 19:12:39,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-26 19:12:39,963 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:12:39,963 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:12:39,964 INFO L424 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:12:39,964 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:39,964 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-10-26 19:12:39,964 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:12:39,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:39,965 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:12:39,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:39,966 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:12:39,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:40,263 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:12:40,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:40,264 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:12:40,264 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:12:40,265 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:12:40,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:40,266 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/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 [2018-10-26 19:12:40,276 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:12:40,276 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:12:40,292 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-26 19:12:40,293 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:12:40,298 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:12:40,378 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:12:40,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:12:41,057 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 19:12:41,087 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:12:41,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-26 19:12:41,087 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:12:41,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-26 19:12:41,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-26 19:12:41,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2018-10-26 19:12:41,088 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 9 states. [2018-10-26 19:12:41,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:12:41,140 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-10-26 19:12:41,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-26 19:12:41,142 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2018-10-26 19:12:41,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:12:41,145 INFO L225 Difference]: With dead ends: 28 [2018-10-26 19:12:41,145 INFO L226 Difference]: Without dead ends: 24 [2018-10-26 19:12:41,146 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2018-10-26 19:12:41,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-26 19:12:41,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-26 19:12:41,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-26 19:12:41,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-10-26 19:12:41,150 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-10-26 19:12:41,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:12:41,150 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-10-26 19:12:41,150 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-26 19:12:41,150 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-10-26 19:12:41,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-26 19:12:41,151 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:12:41,151 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:12:41,152 INFO L424 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:12:41,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:41,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-10-26 19:12:41,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:12:41,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:41,154 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:12:41,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:41,154 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:12:41,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:41,338 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:12:41,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:41,339 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:12:41,339 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:12:41,339 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:12:41,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:41,339 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/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 [2018-10-26 19:12:41,349 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:12:41,349 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:12:41,361 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:12:41,361 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:12:41,364 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:12:41,378 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:12:41,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:12:41,802 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 19:12:41,820 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:12:41,820 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-26 19:12:41,820 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:12:41,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-26 19:12:41,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-26 19:12:41,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2018-10-26 19:12:41,821 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 11 states. [2018-10-26 19:12:41,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:12:41,868 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-10-26 19:12:41,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-26 19:12:41,870 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2018-10-26 19:12:41,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:12:41,871 INFO L225 Difference]: With dead ends: 31 [2018-10-26 19:12:41,871 INFO L226 Difference]: Without dead ends: 27 [2018-10-26 19:12:41,872 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2018-10-26 19:12:41,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-26 19:12:41,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-26 19:12:41,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-26 19:12:41,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-10-26 19:12:41,878 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-10-26 19:12:41,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:12:41,878 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-10-26 19:12:41,878 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-26 19:12:41,878 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-10-26 19:12:41,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-26 19:12:41,879 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:12:41,879 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:12:41,880 INFO L424 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:12:41,880 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:41,880 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-10-26 19:12:41,880 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:12:41,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:41,881 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:12:41,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:41,881 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:12:41,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:42,098 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:12:42,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:42,099 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:12:42,099 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:12:42,099 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:12:42,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:42,100 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/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 [2018-10-26 19:12:42,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:12:42,120 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:12:42,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:42,142 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:12:42,163 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:12:42,163 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:12:42,713 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 19:12:42,733 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:12:42,733 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-26 19:12:42,733 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:12:42,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-26 19:12:42,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-26 19:12:42,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2018-10-26 19:12:42,734 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 13 states. [2018-10-26 19:12:42,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:12:42,801 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-10-26 19:12:42,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-26 19:12:42,805 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 37 [2018-10-26 19:12:42,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:12:42,806 INFO L225 Difference]: With dead ends: 34 [2018-10-26 19:12:42,807 INFO L226 Difference]: Without dead ends: 30 [2018-10-26 19:12:42,807 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2018-10-26 19:12:42,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-26 19:12:42,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-26 19:12:42,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-26 19:12:42,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-10-26 19:12:42,814 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-10-26 19:12:42,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:12:42,815 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-10-26 19:12:42,815 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-26 19:12:42,815 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-10-26 19:12:42,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-26 19:12:42,816 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:12:42,816 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:12:42,816 INFO L424 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:12:42,816 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:42,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-10-26 19:12:42,817 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:12:42,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:42,819 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:12:42,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:42,819 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:12:42,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:43,183 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:12:43,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:43,183 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:12:43,183 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:12:43,183 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:12:43,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:43,183 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/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 [2018-10-26 19:12:43,191 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:12:43,191 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:12:43,259 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-26 19:12:43,259 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:12:43,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:12:43,306 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:12:43,306 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:12:44,025 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-26 19:12:44,045 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:12:44,045 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-26 19:12:44,045 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:12:44,045 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-26 19:12:44,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-26 19:12:44,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=641, Unknown=0, NotChecked=0, Total=756 [2018-10-26 19:12:44,046 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 15 states. [2018-10-26 19:12:44,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:12:44,252 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-10-26 19:12:44,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-26 19:12:44,252 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 43 [2018-10-26 19:12:44,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:12:44,253 INFO L225 Difference]: With dead ends: 37 [2018-10-26 19:12:44,253 INFO L226 Difference]: Without dead ends: 33 [2018-10-26 19:12:44,254 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=115, Invalid=641, Unknown=0, NotChecked=0, Total=756 [2018-10-26 19:12:44,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-26 19:12:44,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-26 19:12:44,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-26 19:12:44,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-10-26 19:12:44,258 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-10-26 19:12:44,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:12:44,258 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-10-26 19:12:44,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-26 19:12:44,258 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-10-26 19:12:44,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-26 19:12:44,259 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:12:44,260 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:12:44,260 INFO L424 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:12:44,260 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:44,260 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-10-26 19:12:44,260 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:12:44,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:44,261 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:12:44,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:44,261 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:12:44,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:44,484 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:12:44,484 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:44,484 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:12:44,484 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:12:44,485 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:12:44,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:44,485 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/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 [2018-10-26 19:12:44,493 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:12:44,493 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:12:44,520 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:12:44,520 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:12:44,523 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:12:44,555 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:12:44,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:12:45,365 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-10-26 19:12:45,971 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-26 19:12:46,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:12:46,005 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-26 19:12:46,005 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:12:46,005 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-26 19:12:46,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-26 19:12:46,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=849, Unknown=0, NotChecked=0, Total=992 [2018-10-26 19:12:46,006 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 17 states. [2018-10-26 19:12:46,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:12:46,101 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-10-26 19:12:46,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-26 19:12:46,102 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 49 [2018-10-26 19:12:46,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:12:46,103 INFO L225 Difference]: With dead ends: 40 [2018-10-26 19:12:46,103 INFO L226 Difference]: Without dead ends: 36 [2018-10-26 19:12:46,104 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=143, Invalid=849, Unknown=0, NotChecked=0, Total=992 [2018-10-26 19:12:46,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-26 19:12:46,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-26 19:12:46,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-26 19:12:46,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-10-26 19:12:46,110 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-10-26 19:12:46,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:12:46,110 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-10-26 19:12:46,110 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-26 19:12:46,110 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-10-26 19:12:46,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-26 19:12:46,111 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:12:46,112 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:12:46,112 INFO L424 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:12:46,112 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:46,112 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-10-26 19:12:46,112 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:12:46,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:46,113 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:12:46,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:46,113 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:12:46,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:46,439 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:12:46,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:46,439 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:12:46,439 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:12:46,440 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:12:46,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:46,440 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/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 [2018-10-26 19:12:46,450 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:12:46,451 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 19:12:46,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:46,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:12:46,497 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:12:46,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:12:47,376 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-26 19:12:47,395 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:12:47,395 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-26 19:12:47,395 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:12:47,396 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-26 19:12:47,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-26 19:12:47,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1085, Unknown=0, NotChecked=0, Total=1260 [2018-10-26 19:12:47,397 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 19 states. [2018-10-26 19:12:47,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:12:47,524 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-10-26 19:12:47,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-26 19:12:47,525 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 55 [2018-10-26 19:12:47,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:12:47,526 INFO L225 Difference]: With dead ends: 43 [2018-10-26 19:12:47,526 INFO L226 Difference]: Without dead ends: 39 [2018-10-26 19:12:47,527 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=175, Invalid=1085, Unknown=0, NotChecked=0, Total=1260 [2018-10-26 19:12:47,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-26 19:12:47,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-26 19:12:47,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-26 19:12:47,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-10-26 19:12:47,532 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-10-26 19:12:47,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:12:47,532 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-10-26 19:12:47,533 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-26 19:12:47,533 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-10-26 19:12:47,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-26 19:12:47,536 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:12:47,536 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:12:47,537 INFO L424 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:12:47,537 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:47,537 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-10-26 19:12:47,537 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:12:47,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:47,538 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 19:12:47,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:47,538 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:12:47,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:47,988 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:12:47,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:47,988 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:12:47,988 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:12:47,988 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:12:47,988 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:47,988 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/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 [2018-10-26 19:12:47,996 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 19:12:47,996 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 19:12:48,028 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-26 19:12:48,028 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:12:48,030 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:12:48,047 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:12:48,047 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:12:49,115 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-26 19:12:49,131 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:12:49,132 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-26 19:12:49,132 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:12:49,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-26 19:12:49,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-26 19:12:49,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1349, Unknown=0, NotChecked=0, Total=1560 [2018-10-26 19:12:49,133 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 21 states. [2018-10-26 19:12:49,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:12:49,242 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-10-26 19:12:49,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-26 19:12:49,243 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 61 [2018-10-26 19:12:49,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:12:49,244 INFO L225 Difference]: With dead ends: 46 [2018-10-26 19:12:49,244 INFO L226 Difference]: Without dead ends: 42 [2018-10-26 19:12:49,245 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=211, Invalid=1349, Unknown=0, NotChecked=0, Total=1560 [2018-10-26 19:12:49,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-26 19:12:49,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-26 19:12:49,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-26 19:12:49,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-10-26 19:12:49,248 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-10-26 19:12:49,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:12:49,251 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-10-26 19:12:49,251 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-26 19:12:49,251 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-10-26 19:12:49,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-26 19:12:49,252 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:12:49,252 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:12:49,252 INFO L424 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:12:49,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:49,253 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-10-26 19:12:49,253 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:12:49,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:49,253 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:12:49,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:49,254 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:12:49,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 19:12:49,601 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:12:49,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:49,601 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 19:12:49,601 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 19:12:49,601 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 19:12:49,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 19:12:49,602 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/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 [2018-10-26 19:12:49,612 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 19:12:49,612 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 19:12:49,648 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 19:12:49,648 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 19:12:49,650 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 19:12:49,677 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:12:49,677 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 19:12:50,834 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-26 19:12:50,852 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 19:12:50,852 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-26 19:12:50,852 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 19:12:50,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-26 19:12:50,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-26 19:12:50,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1641, Unknown=0, NotChecked=0, Total=1892 [2018-10-26 19:12:50,855 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 23 states. [2018-10-26 19:12:51,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 19:12:51,075 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-10-26 19:12:51,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-26 19:12:51,076 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 67 [2018-10-26 19:12:51,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 19:12:51,077 INFO L225 Difference]: With dead ends: 49 [2018-10-26 19:12:51,077 INFO L226 Difference]: Without dead ends: 45 [2018-10-26 19:12:51,078 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 113 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=251, Invalid=1641, Unknown=0, NotChecked=0, Total=1892 [2018-10-26 19:12:51,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-26 19:12:51,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-10-26 19:12:51,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-26 19:12:51,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-10-26 19:12:51,083 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-10-26 19:12:51,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 19:12:51,083 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-10-26 19:12:51,083 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-26 19:12:51,084 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-10-26 19:12:51,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-26 19:12:51,088 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 19:12:51,088 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 19:12:51,088 INFO L424 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 19:12:51,088 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 19:12:51,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-10-26 19:12:51,089 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 19:12:51,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:51,089 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 19:12:51,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 19:12:51,090 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 19:12:51,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 19:12:51,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 19:12:51,176 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-26 19:12:51,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.10 07:12:51 BoogieIcfgContainer [2018-10-26 19:12:51,204 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-26 19:12:51,205 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-26 19:12:51,205 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-26 19:12:51,205 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-26 19:12:51,206 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 07:12:38" (3/4) ... [2018-10-26 19:12:51,208 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-10-26 19:12:51,267 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_fd22c3ec-4a95-43da-9d9c-ad14f5cc32dc/bin-2019/utaipan/witness.graphml [2018-10-26 19:12:51,267 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-26 19:12:51,268 INFO L168 Benchmark]: Toolchain (without parser) took 13721.18 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 208.1 MB). Free memory was 954.5 MB in the beginning and 1.1 GB in the end (delta: -128.2 MB). Peak memory consumption was 80.0 MB. Max. memory is 11.5 GB. [2018-10-26 19:12:51,269 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.0 GB. Free memory is still 980.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 19:12:51,269 INFO L168 Benchmark]: CACSL2BoogieTranslator took 208.18 ms. Allocated memory is still 1.0 GB. Free memory was 954.5 MB in the beginning and 943.6 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 11.5 GB. [2018-10-26 19:12:51,270 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.45 ms. Allocated memory is still 1.0 GB. Free memory is still 943.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 19:12:51,270 INFO L168 Benchmark]: Boogie Preprocessor took 19.79 ms. Allocated memory is still 1.0 GB. Free memory is still 943.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 19:12:51,270 INFO L168 Benchmark]: RCFGBuilder took 413.35 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 167.8 MB). Free memory was 943.6 MB in the beginning and 1.2 GB in the end (delta: -213.0 MB). Peak memory consumption was 23.5 MB. Max. memory is 11.5 GB. [2018-10-26 19:12:51,271 INFO L168 Benchmark]: TraceAbstraction took 12990.46 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 40.4 MB). Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 68.0 MB). Peak memory consumption was 108.3 MB. Max. memory is 11.5 GB. [2018-10-26 19:12:51,271 INFO L168 Benchmark]: Witness Printer took 62.63 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.0 MB). Peak memory consumption was 6.0 MB. Max. memory is 11.5 GB. [2018-10-26 19:12:51,275 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.0 GB. Free memory is still 980.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 208.18 ms. Allocated memory is still 1.0 GB. Free memory was 954.5 MB in the beginning and 943.6 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 21.45 ms. Allocated memory is still 1.0 GB. Free memory is still 943.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 19.79 ms. Allocated memory is still 1.0 GB. Free memory is still 943.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 413.35 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 167.8 MB). Free memory was 943.6 MB in the beginning and 1.2 GB in the end (delta: -213.0 MB). Peak memory consumption was 23.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 12990.46 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 40.4 MB). Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 68.0 MB). Peak memory consumption was 108.3 MB. Max. memory is 11.5 GB. * Witness Printer took 62.63 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.0 MB). Peak memory consumption was 6.0 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] unsigned int input = __VERIFIER_nondet_uint(); [L11] CALL, EXPR id(input) VAL [\old(x)=10] [L5] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L6] CALL, EXPR id(x-1) VAL [\old(x)=9] [L5] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L6] CALL, EXPR id(x-1) VAL [\old(x)=8] [L5] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L6] CALL, EXPR id(x-1) VAL [\old(x)=7] [L5] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L6] CALL, EXPR id(x-1) VAL [\old(x)=6] [L5] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L6] CALL, EXPR id(x-1) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] RET return 0; VAL [\old(x)=0, \result=0, x=0] [L6] EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L6] RET return id(x-1) + 1; [L11] EXPR id(input) VAL [id(input)=10, input=10] [L11] unsigned int result = id(input); [L12] COND TRUE result == 10 VAL [input=10, result=10] [L13] __VERIFIER_error() VAL [input=10, result=10] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. UNSAFE Result, 12.9s OverallTime, 11 OverallIterations, 11 TraceHistogramMax, 1.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 244 SDtfs, 5 SDslu, 2783 SDs, 0 SdLazy, 1169 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 881 GetRequests, 638 SyntacticMatches, 8 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 746 ImplicationChecksByTransitivity, 6.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 1 AbstIntStrong, 0.875 AbsIntWeakeningRatio, 0.5555555555555556 AbsIntAvgWeakeningVarsNumRemoved, 0.4444444444444444 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 9.9s InterpolantComputationTime, 841 NumberOfCodeBlocks, 841 NumberOfCodeBlocksAsserted, 37 NumberOfCheckSat, 1110 ConstructedInterpolants, 0 QuantifiedInterpolants, 206352 SizeOfPredicates, 8 NumberOfNonLiveVariables, 768 ConjunctsInSsa, 240 ConjunctsInUnsatCore, 26 InterpolantComputations, 1 PerfectInterpolantSequences, 1346/2692 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...