./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/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 946ca263ceeb3f3c46f4e6e15a44f3d7052d43ca ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-635dfa2 [2018-12-09 05:49:09,314 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-09 05:49:09,315 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-09 05:49:09,321 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-09 05:49:09,321 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-09 05:49:09,322 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-09 05:49:09,323 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-09 05:49:09,323 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-09 05:49:09,324 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-09 05:49:09,325 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-09 05:49:09,325 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-09 05:49:09,325 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-09 05:49:09,326 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-09 05:49:09,326 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-09 05:49:09,327 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-09 05:49:09,327 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-09 05:49:09,328 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-09 05:49:09,328 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-09 05:49:09,329 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-09 05:49:09,330 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-09 05:49:09,330 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-09 05:49:09,331 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-09 05:49:09,332 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-09 05:49:09,332 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-09 05:49:09,332 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-09 05:49:09,333 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-09 05:49:09,333 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-09 05:49:09,334 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-09 05:49:09,334 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-09 05:49:09,335 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-09 05:49:09,335 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-09 05:49:09,335 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-09 05:49:09,335 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-09 05:49:09,335 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-09 05:49:09,336 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-09 05:49:09,336 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-09 05:49:09,336 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-09 05:49:09,343 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-09 05:49:09,343 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-09 05:49:09,344 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-09 05:49:09,344 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-09 05:49:09,344 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-09 05:49:09,344 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-09 05:49:09,344 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-09 05:49:09,345 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-09 05:49:09,345 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-09 05:49:09,345 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-09 05:49:09,345 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-09 05:49:09,345 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-09 05:49:09,345 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-09 05:49:09,346 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-09 05:49:09,346 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-09 05:49:09,346 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-09 05:49:09,346 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-09 05:49:09,346 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-09 05:49:09,346 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-09 05:49:09,346 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-09 05:49:09,346 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-09 05:49:09,347 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-09 05:49:09,347 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-09 05:49:09,347 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-09 05:49:09,347 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-09 05:49:09,347 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-09 05:49:09,347 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-09 05:49:09,347 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-09 05:49:09,347 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-09 05:49:09,348 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-09 05:49:09,348 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-09 05:49:09,348 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-09 05:49:09,348 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-09 05:49:09,348 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-09 05:49:09,348 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-09 05:49:09,348 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-09 05:49:09,348 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_1a317004-8355-4bff-8f80-47967d6a4c06/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 -> 946ca263ceeb3f3c46f4e6e15a44f3d7052d43ca [2018-12-09 05:49:09,366 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-09 05:49:09,375 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-09 05:49:09,378 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-09 05:49:09,379 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-09 05:49:09,379 INFO L276 PluginConnector]: CDTParser initialized [2018-12-09 05:49:09,379 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c [2018-12-09 05:49:09,415 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/data/109ecb7c7/d5b11e99f4f045f998d95bca635649f8/FLAGa9cb84cad [2018-12-09 05:49:09,708 INFO L307 CDTParser]: Found 1 translation units. [2018-12-09 05:49:09,709 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/sv-benchmarks/c/recursive-simple/id_i15_o15_true-unreach-call_true-termination.c [2018-12-09 05:49:09,712 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/data/109ecb7c7/d5b11e99f4f045f998d95bca635649f8/FLAGa9cb84cad [2018-12-09 05:49:10,145 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/data/109ecb7c7/d5b11e99f4f045f998d95bca635649f8 [2018-12-09 05:49:10,148 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-09 05:49:10,149 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-09 05:49:10,150 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-09 05:49:10,150 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-09 05:49:10,153 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-09 05:49:10,153 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:49:10" (1/1) ... [2018-12-09 05:49:10,155 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e47b5ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10, skipping insertion in model container [2018-12-09 05:49:10,156 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:49:10" (1/1) ... [2018-12-09 05:49:10,161 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-09 05:49:10,169 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-09 05:49:10,256 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 05:49:10,258 INFO L191 MainTranslator]: Completed pre-run [2018-12-09 05:49:10,266 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 05:49:10,274 INFO L195 MainTranslator]: Completed translation [2018-12-09 05:49:10,274 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10 WrapperNode [2018-12-09 05:49:10,274 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-09 05:49:10,274 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-09 05:49:10,274 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-09 05:49:10,274 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-09 05:49:10,279 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10" (1/1) ... [2018-12-09 05:49:10,282 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10" (1/1) ... [2018-12-09 05:49:10,286 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-09 05:49:10,286 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-09 05:49:10,286 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-09 05:49:10,286 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-09 05:49:10,291 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10" (1/1) ... [2018-12-09 05:49:10,291 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10" (1/1) ... [2018-12-09 05:49:10,291 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10" (1/1) ... [2018-12-09 05:49:10,292 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10" (1/1) ... [2018-12-09 05:49:10,293 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10" (1/1) ... [2018-12-09 05:49:10,294 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10" (1/1) ... [2018-12-09 05:49:10,295 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10" (1/1) ... [2018-12-09 05:49:10,296 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-09 05:49:10,296 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-09 05:49:10,296 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-09 05:49:10,296 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-09 05:49:10,296 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-09 05:49:10,357 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-09 05:49:10,357 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-09 05:49:10,357 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-09 05:49:10,357 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-09 05:49:10,357 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-09 05:49:10,358 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-09 05:49:10,358 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-12-09 05:49:10,358 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-12-09 05:49:10,436 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-09 05:49:10,436 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-09 05:49:10,437 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:49:10 BoogieIcfgContainer [2018-12-09 05:49:10,437 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-09 05:49:10,437 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-09 05:49:10,437 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-09 05:49:10,439 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-09 05:49:10,439 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 05:49:10" (1/3) ... [2018-12-09 05:49:10,440 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f5acad4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:49:10, skipping insertion in model container [2018-12-09 05:49:10,440 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:49:10" (2/3) ... [2018-12-09 05:49:10,440 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f5acad4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:49:10, skipping insertion in model container [2018-12-09 05:49:10,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:49:10" (3/3) ... [2018-12-09 05:49:10,442 INFO L112 eAbstractionObserver]: Analyzing ICFG id_i15_o15_true-unreach-call_true-termination.c [2018-12-09 05:49:10,448 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-09 05:49:10,453 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-09 05:49:10,463 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-09 05:49:10,484 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-09 05:49:10,485 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-09 05:49:10,485 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-09 05:49:10,485 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-09 05:49:10,485 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-09 05:49:10,485 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-09 05:49:10,485 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-09 05:49:10,485 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-09 05:49:10,497 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-12-09 05:49:10,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-09 05:49:10,501 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:10,501 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:10,503 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:10,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:10,507 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-12-09 05:49:10,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:10,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:10,537 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:10,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:10,537 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:10,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:10,609 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 05:49:10,611 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 05:49:10,611 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-09 05:49:10,611 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 05:49:10,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-09 05:49:10,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-09 05:49:10,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 05:49:10,623 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-12-09 05:49:10,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:10,673 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-12-09 05:49:10,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-09 05:49:10,674 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-12-09 05:49:10,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:10,681 INFO L225 Difference]: With dead ends: 30 [2018-12-09 05:49:10,681 INFO L226 Difference]: Without dead ends: 18 [2018-12-09 05:49:10,683 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-09 05:49:10,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-12-09 05:49:10,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-12-09 05:49:10,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-09 05:49:10,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-12-09 05:49:10,707 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-12-09 05:49:10,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:10,707 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-12-09 05:49:10,707 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-09 05:49:10,707 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-12-09 05:49:10,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-09 05:49:10,708 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:10,708 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:10,709 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:10,709 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:10,709 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-12-09 05:49:10,709 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:10,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:10,710 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:10,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:10,710 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:10,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:10,755 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-09 05:49:10,756 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:10,756 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:10,756 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-12-09 05:49:10,757 INFO L205 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-12-09 05:49:10,775 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-09 05:49:10,775 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-09 05:49:10,864 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-09 05:49:10,865 INFO L272 AbstractInterpreter]: Visited 17 different actions 50 times. Never merged. Widened at 1 different actions 2 times. Performed 106 root evaluator evaluations with a maximum evaluation depth of 3. Performed 106 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-12-09 05:49:10,870 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:10,870 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-09 05:49:10,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:10,870 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:10,877 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:10,877 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 05:49:10,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:10,893 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:10,917 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-09 05:49:10,918 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:11,029 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-09 05:49:11,044 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:11,044 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-12-09 05:49:11,044 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:11,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-09 05:49:11,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-09 05:49:11,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-12-09 05:49:11,045 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-12-09 05:49:11,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:11,074 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-09 05:49:11,074 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-09 05:49:11,074 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-12-09 05:49:11,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:11,075 INFO L225 Difference]: With dead ends: 25 [2018-12-09 05:49:11,075 INFO L226 Difference]: Without dead ends: 21 [2018-12-09 05:49:11,076 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2018-12-09 05:49:11,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-09 05:49:11,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-09 05:49:11,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-09 05:49:11,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-12-09 05:49:11,078 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-12-09 05:49:11,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:11,079 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-12-09 05:49:11,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-09 05:49:11,079 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-12-09 05:49:11,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-12-09 05:49:11,079 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:11,079 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:11,080 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:11,080 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:11,080 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-12-09 05:49:11,080 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:11,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:11,080 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:11,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:11,081 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:11,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:11,113 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-09 05:49:11,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:11,113 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:11,113 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:11,113 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:11,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:11,113 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:11,119 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 05:49:11,119 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 05:49:11,126 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-09 05:49:11,126 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 05:49:11,127 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:11,133 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-12-09 05:49:11,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:11,297 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-12-09 05:49:11,315 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:11,316 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-12-09 05:49:11,316 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:11,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-09 05:49:11,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-09 05:49:11,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-12-09 05:49:11,317 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-12-09 05:49:11,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:11,356 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-12-09 05:49:11,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-09 05:49:11,357 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-12-09 05:49:11,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:11,357 INFO L225 Difference]: With dead ends: 28 [2018-12-09 05:49:11,357 INFO L226 Difference]: Without dead ends: 24 [2018-12-09 05:49:11,358 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-12-09 05:49:11,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-12-09 05:49:11,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-12-09 05:49:11,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-09 05:49:11,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-12-09 05:49:11,361 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-12-09 05:49:11,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:11,361 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-12-09 05:49:11,361 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-09 05:49:11,361 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-12-09 05:49:11,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-12-09 05:49:11,361 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:11,361 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:11,362 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:11,362 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:11,362 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-12-09 05:49:11,362 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:11,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:11,363 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 05:49:11,363 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:11,363 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:11,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:11,410 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-09 05:49:11,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:11,410 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:11,411 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:11,411 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:11,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:11,411 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:11,418 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 05:49:11,419 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 05:49:11,428 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 05:49:11,428 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 05:49:11,430 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:11,439 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-09 05:49:11,440 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:11,694 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-09 05:49:11,710 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:11,710 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2018-12-09 05:49:11,710 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:11,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-09 05:49:11,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-09 05:49:11,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-12-09 05:49:11,711 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-12-09 05:49:11,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:11,747 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-09 05:49:11,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-09 05:49:11,747 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-12-09 05:49:11,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:11,747 INFO L225 Difference]: With dead ends: 31 [2018-12-09 05:49:11,748 INFO L226 Difference]: Without dead ends: 27 [2018-12-09 05:49:11,748 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-12-09 05:49:11,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-09 05:49:11,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-09 05:49:11,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-09 05:49:11,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-12-09 05:49:11,751 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-12-09 05:49:11,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:11,751 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-12-09 05:49:11,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-09 05:49:11,751 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-12-09 05:49:11,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-09 05:49:11,751 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:11,751 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:11,752 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:11,752 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:11,752 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-12-09 05:49:11,752 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:11,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:11,752 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 05:49:11,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:11,752 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:11,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:11,793 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-09 05:49:11,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:11,794 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:11,794 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:11,794 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:11,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:11,794 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:11,800 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:11,800 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 05:49:11,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:11,809 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:11,816 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-12-09 05:49:11,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:12,203 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-12-09 05:49:12,217 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:12,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-12-09 05:49:12,217 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:12,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-09 05:49:12,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-09 05:49:12,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-12-09 05:49:12,218 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-12-09 05:49:12,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:12,269 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-12-09 05:49:12,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-09 05:49:12,270 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-12-09 05:49:12,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:12,270 INFO L225 Difference]: With dead ends: 34 [2018-12-09 05:49:12,270 INFO L226 Difference]: Without dead ends: 30 [2018-12-09 05:49:12,271 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-12-09 05:49:12,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-09 05:49:12,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-12-09 05:49:12,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-09 05:49:12,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-12-09 05:49:12,274 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-12-09 05:49:12,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:12,274 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-12-09 05:49:12,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-09 05:49:12,274 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-12-09 05:49:12,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-12-09 05:49:12,275 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:12,275 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:12,275 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:12,275 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:12,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-12-09 05:49:12,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:12,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:12,276 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:12,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:12,277 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:12,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:12,326 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-09 05:49:12,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:12,326 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:12,326 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:12,327 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:12,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:12,327 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:12,332 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 05:49:12,332 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 05:49:12,341 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-09 05:49:12,341 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 05:49:12,342 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:12,349 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-09 05:49:12,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:12,925 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-12-09 05:49:12,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:12,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2018-12-09 05:49:12,940 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:12,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-09 05:49:12,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-09 05:49:12,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-12-09 05:49:12,941 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-12-09 05:49:13,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:13,000 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-09 05:49:13,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-09 05:49:13,001 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-12-09 05:49:13,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:13,001 INFO L225 Difference]: With dead ends: 37 [2018-12-09 05:49:13,001 INFO L226 Difference]: Without dead ends: 33 [2018-12-09 05:49:13,002 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 73 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2018-12-09 05:49:13,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-09 05:49:13,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-09 05:49:13,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-09 05:49:13,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-12-09 05:49:13,006 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-12-09 05:49:13,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:13,007 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-12-09 05:49:13,007 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-09 05:49:13,007 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-12-09 05:49:13,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-09 05:49:13,008 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:13,008 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:13,008 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:13,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:13,008 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-12-09 05:49:13,008 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:13,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:13,009 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 05:49:13,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:13,009 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:13,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:13,076 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-12-09 05:49:13,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:13,076 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:13,076 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:13,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:13,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:13,077 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:13,082 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 05:49:13,082 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 05:49:13,093 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 05:49:13,093 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 05:49:13,094 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:13,104 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-12-09 05:49:13,105 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:13,893 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-12-09 05:49:13,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:13,908 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2018-12-09 05:49:13,908 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:13,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-09 05:49:13,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-09 05:49:13,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2018-12-09 05:49:13,909 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-12-09 05:49:13,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:13,965 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-12-09 05:49:13,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-09 05:49:13,966 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-12-09 05:49:13,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:13,966 INFO L225 Difference]: With dead ends: 40 [2018-12-09 05:49:13,966 INFO L226 Difference]: Without dead ends: 36 [2018-12-09 05:49:13,967 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 83 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2018-12-09 05:49:13,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-09 05:49:13,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-12-09 05:49:13,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-09 05:49:13,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-12-09 05:49:13,971 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-12-09 05:49:13,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:13,971 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-12-09 05:49:13,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-09 05:49:13,972 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-12-09 05:49:13,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-09 05:49:13,972 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:13,972 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:13,972 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:13,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:13,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-12-09 05:49:13,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:13,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:13,974 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 05:49:13,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:13,974 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:13,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:14,049 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-12-09 05:49:14,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:14,050 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:14,050 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:14,050 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:14,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:14,050 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:14,055 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:14,056 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 05:49:14,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:14,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:14,073 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-12-09 05:49:14,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:15,147 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-12-09 05:49:15,162 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:15,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2018-12-09 05:49:15,162 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:15,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-09 05:49:15,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-09 05:49:15,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-12-09 05:49:15,163 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-12-09 05:49:15,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:15,257 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-09 05:49:15,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-09 05:49:15,257 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-12-09 05:49:15,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:15,258 INFO L225 Difference]: With dead ends: 43 [2018-12-09 05:49:15,258 INFO L226 Difference]: Without dead ends: 39 [2018-12-09 05:49:15,259 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 93 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2018-12-09 05:49:15,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-09 05:49:15,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-09 05:49:15,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-09 05:49:15,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-12-09 05:49:15,262 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-12-09 05:49:15,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:15,262 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-12-09 05:49:15,262 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-09 05:49:15,262 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-12-09 05:49:15,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-12-09 05:49:15,263 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:15,263 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:15,263 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:15,263 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:15,263 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-12-09 05:49:15,263 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:15,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:15,264 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:15,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:15,264 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:15,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:15,330 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-12-09 05:49:15,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:15,330 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:15,330 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:15,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:15,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:15,331 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:15,337 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 05:49:15,337 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 05:49:15,349 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-09 05:49:15,350 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 05:49:15,351 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:15,363 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-12-09 05:49:15,363 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:16,812 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-12-09 05:49:16,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:16,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2018-12-09 05:49:16,828 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:16,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-09 05:49:16,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-09 05:49:16,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-09 05:49:16,829 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-12-09 05:49:16,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:16,903 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-12-09 05:49:16,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-09 05:49:16,904 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-12-09 05:49:16,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:16,904 INFO L225 Difference]: With dead ends: 46 [2018-12-09 05:49:16,904 INFO L226 Difference]: Without dead ends: 42 [2018-12-09 05:49:16,905 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 103 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2018-12-09 05:49:16,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-12-09 05:49:16,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-12-09 05:49:16,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-09 05:49:16,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-12-09 05:49:16,907 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-12-09 05:49:16,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:16,908 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-12-09 05:49:16,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-09 05:49:16,908 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-12-09 05:49:16,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-12-09 05:49:16,908 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:16,908 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:16,908 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:16,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:16,909 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-12-09 05:49:16,909 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:16,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:16,909 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 05:49:16,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:16,909 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:16,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:17,002 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-12-09 05:49:17,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:17,002 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:17,002 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:17,002 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:17,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:17,002 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:17,008 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 05:49:17,008 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 05:49:17,020 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 05:49:17,020 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 05:49:17,021 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:17,030 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-12-09 05:49:17,030 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:19,058 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-12-09 05:49:19,074 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:19,074 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-12-09 05:49:19,075 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:19,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-09 05:49:19,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-09 05:49:19,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-12-09 05:49:19,075 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-12-09 05:49:19,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:19,158 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-09 05:49:19,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-09 05:49:19,158 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-12-09 05:49:19,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:19,159 INFO L225 Difference]: With dead ends: 49 [2018-12-09 05:49:19,159 INFO L226 Difference]: Without dead ends: 45 [2018-12-09 05:49:19,159 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 113 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2018-12-09 05:49:19,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-09 05:49:19,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-09 05:49:19,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-09 05:49:19,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-12-09 05:49:19,164 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-12-09 05:49:19,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:19,164 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-12-09 05:49:19,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-09 05:49:19,164 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-12-09 05:49:19,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-12-09 05:49:19,165 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:19,166 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:19,166 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:19,166 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:19,166 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-12-09 05:49:19,166 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:19,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:19,167 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 05:49:19,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:19,167 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:19,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:19,249 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-12-09 05:49:19,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:19,249 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:19,249 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:19,249 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:19,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:19,249 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:19,255 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:19,255 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 05:49:19,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:19,268 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:19,284 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-12-09 05:49:19,284 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:21,827 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-12-09 05:49:21,841 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:21,841 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-12-09 05:49:21,841 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:21,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-09 05:49:21,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-09 05:49:21,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-12-09 05:49:21,842 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-12-09 05:49:21,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:21,942 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-12-09 05:49:21,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-09 05:49:21,943 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-12-09 05:49:21,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:21,943 INFO L225 Difference]: With dead ends: 52 [2018-12-09 05:49:21,943 INFO L226 Difference]: Without dead ends: 48 [2018-12-09 05:49:21,944 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 123 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2018-12-09 05:49:21,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-09 05:49:21,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-12-09 05:49:21,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-09 05:49:21,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-12-09 05:49:21,946 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-12-09 05:49:21,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:21,946 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-12-09 05:49:21,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-09 05:49:21,947 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-12-09 05:49:21,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-09 05:49:21,947 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:21,947 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:21,947 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:21,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:21,947 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2018-12-09 05:49:21,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:21,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:21,948 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:21,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:21,948 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:21,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:22,049 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-12-09 05:49:22,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:22,049 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:22,049 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:22,050 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:22,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:22,050 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:22,055 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 05:49:22,055 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 05:49:22,071 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-09 05:49:22,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 05:49:22,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:22,082 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-12-09 05:49:22,082 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:26,082 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-12-09 05:49:26,097 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:26,098 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-12-09 05:49:26,098 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:26,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-09 05:49:26,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-09 05:49:26,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-12-09 05:49:26,098 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-12-09 05:49:26,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:26,202 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-09 05:49:26,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-09 05:49:26,202 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-12-09 05:49:26,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:26,203 INFO L225 Difference]: With dead ends: 55 [2018-12-09 05:49:26,203 INFO L226 Difference]: Without dead ends: 51 [2018-12-09 05:49:26,204 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 133 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2018-12-09 05:49:26,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-09 05:49:26,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-09 05:49:26,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-09 05:49:26,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-12-09 05:49:26,207 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-12-09 05:49:26,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:26,207 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-12-09 05:49:26,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-09 05:49:26,207 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-12-09 05:49:26,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-12-09 05:49:26,208 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:26,208 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:26,208 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:26,208 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:26,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2018-12-09 05:49:26,209 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:26,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:26,209 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 05:49:26,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:26,209 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:26,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:26,307 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-12-09 05:49:26,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:26,308 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:26,308 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:26,308 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:26,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:26,308 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:26,314 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 05:49:26,314 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 05:49:26,327 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 05:49:26,327 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 05:49:26,329 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:26,339 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-12-09 05:49:26,340 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:30,623 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-12-09 05:49:30,639 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:30,639 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2018-12-09 05:49:30,639 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:30,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-09 05:49:30,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-09 05:49:30,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2018-12-09 05:49:30,640 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-12-09 05:49:30,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:30,770 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-12-09 05:49:30,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-09 05:49:30,770 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-12-09 05:49:30,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:30,770 INFO L225 Difference]: With dead ends: 58 [2018-12-09 05:49:30,770 INFO L226 Difference]: Without dead ends: 54 [2018-12-09 05:49:30,771 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 143 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2018-12-09 05:49:30,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-09 05:49:30,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-12-09 05:49:30,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-09 05:49:30,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-12-09 05:49:30,774 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-12-09 05:49:30,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:30,774 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-12-09 05:49:30,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-09 05:49:30,774 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-12-09 05:49:30,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-12-09 05:49:30,774 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:30,775 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:30,775 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:30,775 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:30,775 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2018-12-09 05:49:30,775 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:30,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:30,775 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 05:49:30,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:30,775 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:30,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:30,867 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-12-09 05:49:30,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:30,867 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:30,867 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:30,867 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:30,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:30,867 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:30,873 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:30,873 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 05:49:30,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:30,887 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:30,896 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-12-09 05:49:30,897 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:37,093 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-12-09 05:49:37,113 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:37,113 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2018-12-09 05:49:37,113 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:37,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-09 05:49:37,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-09 05:49:37,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2018-12-09 05:49:37,114 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-12-09 05:49:37,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:37,273 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-09 05:49:37,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-09 05:49:37,273 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-12-09 05:49:37,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:37,274 INFO L225 Difference]: With dead ends: 61 [2018-12-09 05:49:37,274 INFO L226 Difference]: Without dead ends: 57 [2018-12-09 05:49:37,275 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 153 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2018-12-09 05:49:37,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-09 05:49:37,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-09 05:49:37,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-09 05:49:37,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-12-09 05:49:37,278 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-12-09 05:49:37,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:37,279 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-12-09 05:49:37,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-09 05:49:37,279 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-12-09 05:49:37,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-09 05:49:37,279 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:37,279 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:37,280 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:37,280 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:37,280 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2018-12-09 05:49:37,280 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:37,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:37,280 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 05:49:37,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:37,281 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:37,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:37,389 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-12-09 05:49:37,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:37,389 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:37,389 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:37,389 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:37,389 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:37,389 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:37,396 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 05:49:37,396 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 05:49:37,415 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-09 05:49:37,415 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 05:49:37,417 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:37,431 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-12-09 05:49:37,431 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:43,619 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-12-09 05:49:43,634 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:43,634 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 34 [2018-12-09 05:49:43,634 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:43,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-09 05:49:43,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-09 05:49:43,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2018-12-09 05:49:43,635 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-12-09 05:49:43,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:43,762 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-12-09 05:49:43,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-09 05:49:43,763 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-12-09 05:49:43,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:43,763 INFO L225 Difference]: With dead ends: 64 [2018-12-09 05:49:43,763 INFO L226 Difference]: Without dead ends: 60 [2018-12-09 05:49:43,764 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 163 SyntacticMatches, 31 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=800, Invalid=1552, Unknown=0, NotChecked=0, Total=2352 [2018-12-09 05:49:43,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-12-09 05:49:43,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-12-09 05:49:43,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-09 05:49:43,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-12-09 05:49:43,767 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-12-09 05:49:43,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:43,767 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-12-09 05:49:43,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-09 05:49:43,768 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-12-09 05:49:43,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-12-09 05:49:43,768 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:43,768 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:43,768 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:43,769 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:43,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2018-12-09 05:49:43,769 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:43,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:43,769 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 05:49:43,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:43,770 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:43,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:44,196 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-12-09 05:49:44,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:44,197 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 05:49:44,197 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 05:49:44,197 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 05:49:44,197 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 05:49:44,197 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 05:49:44,203 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 05:49:44,203 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 05:49:44,218 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 05:49:44,218 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 05:49:44,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 05:49:44,233 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-12-09 05:49:44,233 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 05:49:45,095 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-12-09 05:49:45,110 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 05:49:45,110 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 35 [2018-12-09 05:49:45,110 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 05:49:45,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-09 05:49:45,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-09 05:49:45,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-12-09 05:49:45,111 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 35 states. [2018-12-09 05:49:45,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:45,342 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-09 05:49:45,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-09 05:49:45,343 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 103 [2018-12-09 05:49:45,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:45,343 INFO L225 Difference]: With dead ends: 67 [2018-12-09 05:49:45,343 INFO L226 Difference]: Without dead ends: 63 [2018-12-09 05:49:45,344 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 205 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2018-12-09 05:49:45,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-09 05:49:45,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-09 05:49:45,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-09 05:49:45,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-12-09 05:49:45,347 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-12-09 05:49:45,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:45,347 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-12-09 05:49:45,347 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-09 05:49:45,347 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-12-09 05:49:45,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-12-09 05:49:45,347 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 05:49:45,347 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 05:49:45,347 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 05:49:45,348 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 05:49:45,348 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2018-12-09 05:49:45,348 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 05:49:45,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:45,348 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 05:49:45,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 05:49:45,348 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 05:49:45,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 05:49:45,478 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 392 proven. 0 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-12-09 05:49:45,478 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 05:49:45,479 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2018-12-09 05:49:45,479 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 05:49:45,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-09 05:49:45,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-09 05:49:45,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420 [2018-12-09 05:49:45,479 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-12-09 05:49:45,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 05:49:45,589 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-09 05:49:45,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-09 05:49:45,590 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-12-09 05:49:45,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 05:49:45,590 INFO L225 Difference]: With dead ends: 63 [2018-12-09 05:49:45,590 INFO L226 Difference]: Without dead ends: 0 [2018-12-09 05:49:45,591 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=515, Invalid=891, Unknown=0, NotChecked=0, Total=1406 [2018-12-09 05:49:45,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-12-09 05:49:45,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-12-09 05:49:45,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-12-09 05:49:45,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-12-09 05:49:45,592 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 109 [2018-12-09 05:49:45,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 05:49:45,592 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-12-09 05:49:45,592 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-09 05:49:45,592 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-12-09 05:49:45,592 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-09 05:49:45,595 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-12-09 05:49:45,608 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-12-09 05:49:45,608 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-12-09 05:49:45,608 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-12-09 05:49:45,608 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-12-09 05:49:45,608 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-12-09 05:49:45,608 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-12-09 05:49:45,608 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 9 15) the Hoare annotation is: true [2018-12-09 05:49:45,608 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 9 15) no Hoare annotation was computed. [2018-12-09 05:49:45,608 INFO L448 ceAbstractionStarter]: For program point L13(line 13) no Hoare annotation was computed. [2018-12-09 05:49:45,608 INFO L448 ceAbstractionStarter]: For program point L12(lines 12 14) no Hoare annotation was computed. [2018-12-09 05:49:45,608 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2018-12-09 05:49:45,608 INFO L444 ceAbstractionStarter]: At program point L11(line 11) the Hoare annotation is: (and (<= main_~input~0 15) (<= 15 main_~input~0)) [2018-12-09 05:49:45,608 INFO L448 ceAbstractionStarter]: For program point L11-1(line 11) no Hoare annotation was computed. [2018-12-09 05:49:45,608 INFO L448 ceAbstractionStarter]: For program point L12-2(lines 9 15) no Hoare annotation was computed. [2018-12-09 05:49:45,608 INFO L448 ceAbstractionStarter]: For program point idFINAL(lines 4 7) no Hoare annotation was computed. [2018-12-09 05:49:45,609 INFO L448 ceAbstractionStarter]: For program point idEXIT(lines 4 7) no Hoare annotation was computed. [2018-12-09 05:49:45,609 INFO L451 ceAbstractionStarter]: At program point idENTRY(lines 4 7) the Hoare annotation is: true [2018-12-09 05:49:45,609 INFO L444 ceAbstractionStarter]: At program point L6(line 6) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2018-12-09 05:49:45,609 INFO L448 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-12-09 05:49:45,609 INFO L448 ceAbstractionStarter]: For program point L6-1(line 6) no Hoare annotation was computed. [2018-12-09 05:49:45,610 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 05:49:45 BoogieIcfgContainer [2018-12-09 05:49:45,610 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-09 05:49:45,610 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-09 05:49:45,610 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-09 05:49:45,610 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-09 05:49:45,611 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:49:10" (3/4) ... [2018-12-09 05:49:45,613 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-12-09 05:49:45,616 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-12-09 05:49:45,616 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-12-09 05:49:45,616 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id [2018-12-09 05:49:45,619 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-12-09 05:49:45,619 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-12-09 05:49:45,619 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-12-09 05:49:45,641 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_1a317004-8355-4bff-8f80-47967d6a4c06/bin-2019/utaipan/witness.graphml [2018-12-09 05:49:45,641 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-09 05:49:45,641 INFO L168 Benchmark]: Toolchain (without parser) took 35492.90 ms. Allocated memory was 1.0 GB in the beginning and 1.7 GB in the end (delta: 666.9 MB). Free memory was 953.3 MB in the beginning and 869.7 MB in the end (delta: 83.6 MB). Peak memory consumption was 750.5 MB. Max. memory is 11.5 GB. [2018-12-09 05:49:45,642 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 979.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 05:49:45,642 INFO L168 Benchmark]: CACSL2BoogieTranslator took 124.00 ms. Allocated memory is still 1.0 GB. Free memory was 953.3 MB in the beginning and 942.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-12-09 05:49:45,642 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.32 ms. Allocated memory is still 1.0 GB. Free memory is still 942.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 05:49:45,643 INFO L168 Benchmark]: Boogie Preprocessor took 9.88 ms. Allocated memory is still 1.0 GB. Free memory is still 942.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 05:49:45,643 INFO L168 Benchmark]: RCFGBuilder took 141.02 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 123.2 MB). Free memory was 942.6 MB in the beginning and 1.1 GB in the end (delta: -163.6 MB). Peak memory consumption was 15.3 MB. Max. memory is 11.5 GB. [2018-12-09 05:49:45,643 INFO L168 Benchmark]: TraceAbstraction took 35172.92 ms. Allocated memory was 1.2 GB in the beginning and 1.7 GB in the end (delta: 543.7 MB). Free memory was 1.1 GB in the beginning and 869.7 MB in the end (delta: 236.5 MB). Peak memory consumption was 780.2 MB. Max. memory is 11.5 GB. [2018-12-09 05:49:45,643 INFO L168 Benchmark]: Witness Printer took 30.55 ms. Allocated memory is still 1.7 GB. Free memory is still 869.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 05:49:45,645 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 979.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 124.00 ms. Allocated memory is still 1.0 GB. Free memory was 953.3 MB in the beginning and 942.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 11.32 ms. Allocated memory is still 1.0 GB. Free memory is still 942.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 9.88 ms. Allocated memory is still 1.0 GB. Free memory is still 942.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 141.02 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 123.2 MB). Free memory was 942.6 MB in the beginning and 1.1 GB in the end (delta: -163.6 MB). Peak memory consumption was 15.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 35172.92 ms. Allocated memory was 1.2 GB in the beginning and 1.7 GB in the end (delta: 543.7 MB). Free memory was 1.1 GB in the beginning and 869.7 MB in the end (delta: 236.5 MB). Peak memory consumption was 780.2 MB. Max. memory is 11.5 GB. * Witness Printer took 30.55 ms. Allocated memory is still 1.7 GB. Free memory is still 869.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 35.1s OverallTime, 17 OverallIterations, 17 TraceHistogramMax, 1.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 285 SDtfs, 322 SDslu, 2582 SDs, 0 SdLazy, 1616 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2309 GetRequests, 1597 SyntacticMatches, 241 SemanticMatches, 471 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3674 ImplicationChecksByTransitivity, 3.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=63occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 17 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 19 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 32.5s InterpolantComputationTime, 1952 NumberOfCodeBlocks, 1952 NumberOfCodeBlocksAsserted, 77 NumberOfCheckSat, 2820 ConstructedInterpolants, 0 QuantifiedInterpolants, 613896 SizeOfPredicates, 134 NumberOfNonLiveVariables, 2145 ConjunctsInSsa, 333 ConjunctsInUnsatCore, 47 InterpolantComputations, 2 PerfectInterpolantSequences, 5529/12304 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...