./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/sum_20x0_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_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_20x0_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 f4078ef7bc39da0337b6d8ed5ecbbcec336a37b8 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 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 19:38:54,117 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-09 19:38:54,118 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-09 19:38:54,125 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-09 19:38:54,125 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-09 19:38:54,126 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-09 19:38:54,126 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-09 19:38:54,127 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-09 19:38:54,128 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-09 19:38:54,129 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-09 19:38:54,129 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-09 19:38:54,130 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-09 19:38:54,130 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-09 19:38:54,131 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-09 19:38:54,131 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-09 19:38:54,132 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-09 19:38:54,132 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-09 19:38:54,134 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-09 19:38:54,135 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-09 19:38:54,136 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-09 19:38:54,137 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-09 19:38:54,138 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-09 19:38:54,139 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-09 19:38:54,139 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-09 19:38:54,140 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-09 19:38:54,140 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-09 19:38:54,141 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-09 19:38:54,141 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-09 19:38:54,142 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-09 19:38:54,143 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-09 19:38:54,143 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-09 19:38:54,143 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-09 19:38:54,143 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-09 19:38:54,144 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-09 19:38:54,144 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-09 19:38:54,145 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-09 19:38:54,145 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-09 19:38:54,151 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-09 19:38:54,152 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-09 19:38:54,152 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-09 19:38:54,152 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-09 19:38:54,152 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-09 19:38:54,152 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-09 19:38:54,152 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-09 19:38:54,152 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-09 19:38:54,153 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-09 19:38:54,153 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-09 19:38:54,153 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-09 19:38:54,153 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-09 19:38:54,153 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-09 19:38:54,153 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-09 19:38:54,153 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-09 19:38:54,153 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-09 19:38:54,153 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-09 19:38:54,153 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-09 19:38:54,154 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-09 19:38:54,154 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-09 19:38:54,154 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-09 19:38:54,154 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-09 19:38:54,154 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-09 19:38:54,154 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-09 19:38:54,154 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-09 19:38:54,154 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-09 19:38:54,154 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-09 19:38:54,154 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-09 19:38:54,154 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-09 19:38:54,154 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-09 19:38:54,155 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-09 19:38:54,155 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-09 19:38:54,155 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-09 19:38:54,155 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-09 19:38:54,155 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-09 19:38:54,155 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-09 19:38:54,155 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_906d7f60-0a2b-4458-839d-545f92d2dafd/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 -> f4078ef7bc39da0337b6d8ed5ecbbcec336a37b8 [2018-12-09 19:38:54,171 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-09 19:38:54,178 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-09 19:38:54,180 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-09 19:38:54,181 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-09 19:38:54,181 INFO L276 PluginConnector]: CDTParser initialized [2018-12-09 19:38:54,181 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/sum_20x0_true-unreach-call_true-termination.c [2018-12-09 19:38:54,215 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/data/77fc5a4b0/e4e17ad9c9a641338e4c477e7b09e157/FLAGab37fca60 [2018-12-09 19:38:54,587 INFO L307 CDTParser]: Found 1 translation units. [2018-12-09 19:38:54,587 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/sv-benchmarks/c/recursive-simple/sum_20x0_true-unreach-call_true-termination.c [2018-12-09 19:38:54,590 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/data/77fc5a4b0/e4e17ad9c9a641338e4c477e7b09e157/FLAGab37fca60 [2018-12-09 19:38:54,599 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/data/77fc5a4b0/e4e17ad9c9a641338e4c477e7b09e157 [2018-12-09 19:38:54,600 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-09 19:38:54,601 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-09 19:38:54,602 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-09 19:38:54,602 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-09 19:38:54,604 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-09 19:38:54,604 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 07:38:54" (1/1) ... [2018-12-09 19:38:54,606 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73973e64 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54, skipping insertion in model container [2018-12-09 19:38:54,606 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 07:38:54" (1/1) ... [2018-12-09 19:38:54,610 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-09 19:38:54,619 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-09 19:38:54,700 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 19:38:54,703 INFO L191 MainTranslator]: Completed pre-run [2018-12-09 19:38:54,711 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 19:38:54,718 INFO L195 MainTranslator]: Completed translation [2018-12-09 19:38:54,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54 WrapperNode [2018-12-09 19:38:54,718 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-09 19:38:54,719 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-09 19:38:54,719 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-09 19:38:54,719 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-09 19:38:54,723 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54" (1/1) ... [2018-12-09 19:38:54,726 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54" (1/1) ... [2018-12-09 19:38:54,729 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-09 19:38:54,730 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-09 19:38:54,730 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-09 19:38:54,730 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-09 19:38:54,735 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54" (1/1) ... [2018-12-09 19:38:54,735 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54" (1/1) ... [2018-12-09 19:38:54,735 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54" (1/1) ... [2018-12-09 19:38:54,735 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54" (1/1) ... [2018-12-09 19:38:54,737 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54" (1/1) ... [2018-12-09 19:38:54,738 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54" (1/1) ... [2018-12-09 19:38:54,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54" (1/1) ... [2018-12-09 19:38:54,739 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-09 19:38:54,739 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-09 19:38:54,740 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-09 19:38:54,740 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-09 19:38:54,740 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:38:54,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-09 19:38:54,799 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-09 19:38:54,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-09 19:38:54,799 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-09 19:38:54,799 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2018-12-09 19:38:54,799 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2018-12-09 19:38:54,799 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-09 19:38:54,800 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-09 19:38:54,872 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-09 19:38:54,872 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-09 19:38:54,872 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 07:38:54 BoogieIcfgContainer [2018-12-09 19:38:54,872 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-09 19:38:54,873 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-09 19:38:54,873 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-09 19:38:54,875 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-09 19:38:54,875 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 07:38:54" (1/3) ... [2018-12-09 19:38:54,875 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4515e744 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 07:38:54, skipping insertion in model container [2018-12-09 19:38:54,875 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 07:38:54" (2/3) ... [2018-12-09 19:38:54,876 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4515e744 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 07:38:54, skipping insertion in model container [2018-12-09 19:38:54,876 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 07:38:54" (3/3) ... [2018-12-09 19:38:54,877 INFO L112 eAbstractionObserver]: Analyzing ICFG sum_20x0_true-unreach-call_true-termination.c [2018-12-09 19:38:54,882 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-09 19:38:54,886 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-09 19:38:54,894 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-09 19:38:54,912 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-09 19:38:54,912 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-09 19:38:54,912 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-09 19:38:54,913 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-09 19:38:54,913 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-09 19:38:54,913 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-09 19:38:54,913 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-09 19:38:54,913 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-09 19:38:54,923 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-12-09 19:38:54,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-09 19:38:54,926 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:38:54,926 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:38:54,928 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:38:54,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:38:54,931 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2018-12-09 19:38:54,932 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:38:54,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:54,960 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:38:54,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:54,960 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:38:54,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:55,022 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 19:38:55,024 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 19:38:55,024 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-09 19:38:55,024 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 19:38:55,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-09 19:38:55,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-09 19:38:55,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 19:38:55,036 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-12-09 19:38:55,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:38:55,084 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-12-09 19:38:55,084 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-09 19:38:55,085 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-12-09 19:38:55,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:38:55,091 INFO L225 Difference]: With dead ends: 30 [2018-12-09 19:38:55,091 INFO L226 Difference]: Without dead ends: 18 [2018-12-09 19:38:55,092 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 19:38:55,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-12-09 19:38:55,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-12-09 19:38:55,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-09 19:38:55,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-12-09 19:38:55,116 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-12-09 19:38:55,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:38:55,116 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-12-09 19:38:55,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-09 19:38:55,117 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-12-09 19:38:55,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-09 19:38:55,118 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:38:55,118 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 19:38:55,118 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:38:55,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:38:55,119 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2018-12-09 19:38:55,119 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:38:55,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:55,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:38:55,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:55,120 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:38:55,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:55,165 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 19:38:55,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:55,166 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:38:55,166 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-12-09 19:38:55,167 INFO L205 CegarAbsIntRunner]: [0], [4], [7], [8], [10], [11], [12], [14], [17], [19], [25], [26], [27], [29], [30], [31], [32] [2018-12-09 19:38:55,186 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-09 19:38:55,186 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-09 19:38:55,281 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-09 19:38:55,282 INFO L272 AbstractInterpreter]: Visited 17 different actions 50 times. Never merged. Widened at 1 different actions 2 times. Performed 130 root evaluator evaluations with a maximum evaluation depth of 4. Performed 130 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 2 fixpoints after 2 different actions. Largest state had 6 variables. [2018-12-09 19:38:55,287 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:38:55,288 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-09 19:38:55,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:55,288 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:38:55,294 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:38:55,294 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 19:38:55,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:55,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:38:55,329 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 19:38:55,329 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:38:55,429 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 19:38:55,454 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:38:55,454 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-12-09 19:38:55,454 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:38:55,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-09 19:38:55,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-09 19:38:55,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-12-09 19:38:55,455 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-12-09 19:38:55,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:38:55,492 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-12-09 19:38:55,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-09 19:38:55,492 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-12-09 19:38:55,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:38:55,493 INFO L225 Difference]: With dead ends: 25 [2018-12-09 19:38:55,493 INFO L226 Difference]: Without dead ends: 21 [2018-12-09 19:38:55,493 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 19:38:55,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-12-09 19:38:55,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-12-09 19:38:55,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-09 19:38:55,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-12-09 19:38:55,496 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-12-09 19:38:55,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:38:55,497 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-12-09 19:38:55,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-09 19:38:55,497 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-12-09 19:38:55,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-12-09 19:38:55,497 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:38:55,498 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 19:38:55,498 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:38:55,498 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:38:55,498 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2018-12-09 19:38:55,498 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:38:55,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:55,499 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:38:55,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:55,499 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:38:55,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:55,549 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 19:38:55,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:55,549 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:38:55,549 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:38:55,549 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:38:55,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:55,550 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:38:55,555 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 19:38:55,555 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 19:38:55,563 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-09 19:38:55,563 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:38:55,564 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:38:55,571 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 19:38:55,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:38:55,726 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 19:38:55,741 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:38:55,741 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-12-09 19:38:55,741 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:38:55,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-09 19:38:55,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-09 19:38:55,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-12-09 19:38:55,742 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-12-09 19:38:55,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:38:55,780 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-12-09 19:38:55,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-09 19:38:55,781 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-12-09 19:38:55,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:38:55,781 INFO L225 Difference]: With dead ends: 28 [2018-12-09 19:38:55,781 INFO L226 Difference]: Without dead ends: 24 [2018-12-09 19:38:55,782 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 19:38:55,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-12-09 19:38:55,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-12-09 19:38:55,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-09 19:38:55,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-12-09 19:38:55,785 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-12-09 19:38:55,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:38:55,785 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-12-09 19:38:55,785 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-09 19:38:55,785 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-12-09 19:38:55,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-12-09 19:38:55,785 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:38:55,785 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 19:38:55,786 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:38:55,786 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:38:55,786 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2018-12-09 19:38:55,786 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:38:55,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:55,787 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:38:55,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:55,787 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:38:55,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:55,835 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 19:38:55,835 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:55,835 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:38:55,835 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:38:55,835 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:38:55,835 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:55,836 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:38:55,841 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 19:38:55,841 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 19:38:55,853 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 19:38:55,853 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:38:55,855 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:38:55,863 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 19:38:55,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:38:56,127 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 19:38:56,141 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:38:56,141 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2018-12-09 19:38:56,141 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:38:56,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-09 19:38:56,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-09 19:38:56,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-12-09 19:38:56,142 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-12-09 19:38:56,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:38:56,186 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-12-09 19:38:56,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-09 19:38:56,187 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-12-09 19:38:56,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:38:56,187 INFO L225 Difference]: With dead ends: 31 [2018-12-09 19:38:56,187 INFO L226 Difference]: Without dead ends: 27 [2018-12-09 19:38:56,188 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 53 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-12-09 19:38:56,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-12-09 19:38:56,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-12-09 19:38:56,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-09 19:38:56,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-12-09 19:38:56,191 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-12-09 19:38:56,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:38:56,191 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-12-09 19:38:56,191 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-09 19:38:56,191 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-12-09 19:38:56,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-09 19:38:56,192 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:38:56,192 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 19:38:56,192 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:38:56,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:38:56,192 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2018-12-09 19:38:56,193 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:38:56,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:56,193 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:38:56,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:56,193 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:38:56,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:56,263 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 19:38:56,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:56,264 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:38:56,264 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:38:56,264 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:38:56,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:56,264 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:38:56,272 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:38:56,272 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 19:38:56,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:56,282 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:38:56,289 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 19:38:56,289 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:38:56,672 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 19:38:56,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:38:56,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-12-09 19:38:56,686 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:38:56,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-09 19:38:56,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-09 19:38:56,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-12-09 19:38:56,687 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-12-09 19:38:56,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:38:56,744 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-12-09 19:38:56,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-09 19:38:56,744 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-12-09 19:38:56,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:38:56,745 INFO L225 Difference]: With dead ends: 34 [2018-12-09 19:38:56,745 INFO L226 Difference]: Without dead ends: 30 [2018-12-09 19:38:56,745 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 19:38:56,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-09 19:38:56,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-12-09 19:38:56,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-09 19:38:56,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-12-09 19:38:56,748 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-12-09 19:38:56,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:38:56,748 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-12-09 19:38:56,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-09 19:38:56,748 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-12-09 19:38:56,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-12-09 19:38:56,748 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:38:56,748 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 19:38:56,749 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:38:56,749 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:38:56,749 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2018-12-09 19:38:56,749 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:38:56,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:56,749 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:38:56,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:56,749 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:38:56,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:56,797 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 19:38:56,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:56,797 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:38:56,797 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:38:56,797 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:38:56,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:56,797 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:38:56,803 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 19:38:56,803 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 19:38:56,814 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-09 19:38:56,814 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:38:56,816 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:38:56,823 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 19:38:56,823 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:38:57,395 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 19:38:57,409 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:38:57,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2018-12-09 19:38:57,410 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:38:57,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-09 19:38:57,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-09 19:38:57,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-12-09 19:38:57,410 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-12-09 19:38:57,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:38:57,461 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-12-09 19:38:57,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-09 19:38:57,462 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-12-09 19:38:57,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:38:57,462 INFO L225 Difference]: With dead ends: 37 [2018-12-09 19:38:57,462 INFO L226 Difference]: Without dead ends: 33 [2018-12-09 19:38:57,463 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 19:38:57,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-09 19:38:57,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-09 19:38:57,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-09 19:38:57,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-12-09 19:38:57,466 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-12-09 19:38:57,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:38:57,466 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-12-09 19:38:57,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-09 19:38:57,466 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-12-09 19:38:57,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-09 19:38:57,467 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:38:57,467 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 19:38:57,467 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:38:57,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:38:57,467 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2018-12-09 19:38:57,467 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:38:57,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:57,468 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:38:57,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:57,468 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:38:57,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:57,527 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 19:38:57,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:57,527 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:38:57,527 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:38:57,527 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:38:57,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:57,528 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:38:57,533 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 19:38:57,533 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 19:38:57,544 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 19:38:57,545 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:38:57,546 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:38:57,553 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 19:38:57,553 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:38:58,320 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 19:38:58,344 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:38:58,344 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2018-12-09 19:38:58,344 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:38:58,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-09 19:38:58,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-09 19:38:58,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2018-12-09 19:38:58,345 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-12-09 19:38:58,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:38:58,406 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-12-09 19:38:58,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-09 19:38:58,406 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-12-09 19:38:58,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:38:58,407 INFO L225 Difference]: With dead ends: 40 [2018-12-09 19:38:58,407 INFO L226 Difference]: Without dead ends: 36 [2018-12-09 19:38:58,408 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 19:38:58,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-09 19:38:58,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-12-09 19:38:58,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-09 19:38:58,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-12-09 19:38:58,412 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-12-09 19:38:58,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:38:58,412 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-12-09 19:38:58,412 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-09 19:38:58,412 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-12-09 19:38:58,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-09 19:38:58,413 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:38:58,413 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 19:38:58,413 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:38:58,413 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:38:58,414 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2018-12-09 19:38:58,414 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:38:58,414 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:58,414 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:38:58,414 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:58,414 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:38:58,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:58,482 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 19:38:58,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:58,482 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:38:58,482 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:38:58,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:38:58,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:58,482 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:38:58,488 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:38:58,488 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 19:38:58,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:58,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:38:58,506 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 19:38:58,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:38:59,578 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 19:38:59,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:38:59,593 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2018-12-09 19:38:59,593 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:38:59,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-09 19:38:59,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-09 19:38:59,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-12-09 19:38:59,594 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-12-09 19:38:59,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:38:59,680 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-12-09 19:38:59,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-09 19:38:59,681 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-12-09 19:38:59,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:38:59,681 INFO L225 Difference]: With dead ends: 43 [2018-12-09 19:38:59,681 INFO L226 Difference]: Without dead ends: 39 [2018-12-09 19:38:59,682 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 19:38:59,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-09 19:38:59,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-12-09 19:38:59,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-09 19:38:59,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-12-09 19:38:59,684 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-12-09 19:38:59,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:38:59,685 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-12-09 19:38:59,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-09 19:38:59,685 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-12-09 19:38:59,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-12-09 19:38:59,685 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:38:59,685 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 19:38:59,685 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:38:59,685 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:38:59,686 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2018-12-09 19:38:59,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:38:59,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:59,686 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:38:59,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:38:59,686 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:38:59,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:38:59,749 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 19:38:59,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:59,750 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:38:59,750 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:38:59,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:38:59,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:38:59,750 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:38:59,756 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 19:38:59,756 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 19:38:59,771 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-09 19:38:59,771 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:38:59,772 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:38:59,782 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 19:38:59,783 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:01,246 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 19:39:01,261 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:01,261 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2018-12-09 19:39:01,261 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:01,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-09 19:39:01,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-09 19:39:01,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-09 19:39:01,262 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-12-09 19:39:01,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:01,350 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-12-09 19:39:01,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-09 19:39:01,350 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-12-09 19:39:01,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:01,351 INFO L225 Difference]: With dead ends: 46 [2018-12-09 19:39:01,351 INFO L226 Difference]: Without dead ends: 42 [2018-12-09 19:39:01,351 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 19:39:01,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-12-09 19:39:01,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-12-09 19:39:01,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-09 19:39:01,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-12-09 19:39:01,354 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-12-09 19:39:01,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:01,354 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-12-09 19:39:01,354 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-09 19:39:01,354 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-12-09 19:39:01,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-12-09 19:39:01,355 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:01,355 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 19:39:01,355 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:01,355 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:01,355 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2018-12-09 19:39:01,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:01,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:01,355 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:39:01,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:01,356 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:01,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:01,430 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 19:39:01,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:01,431 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:01,431 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:01,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:01,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:01,431 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:39:01,437 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 19:39:01,438 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 19:39:01,452 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 19:39:01,452 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:39:01,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:01,462 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 19:39:01,463 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:03,437 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 19:39:03,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:03,452 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-12-09 19:39:03,452 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:03,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-09 19:39:03,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-09 19:39:03,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-12-09 19:39:03,452 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-12-09 19:39:03,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:03,530 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-12-09 19:39:03,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-09 19:39:03,530 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-12-09 19:39:03,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:03,531 INFO L225 Difference]: With dead ends: 49 [2018-12-09 19:39:03,531 INFO L226 Difference]: Without dead ends: 45 [2018-12-09 19:39:03,532 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 19:39:03,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-12-09 19:39:03,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-12-09 19:39:03,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-09 19:39:03,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-12-09 19:39:03,535 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-12-09 19:39:03,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:03,535 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-12-09 19:39:03,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-09 19:39:03,535 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-12-09 19:39:03,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-12-09 19:39:03,536 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:03,536 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 19:39:03,536 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:03,536 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:03,537 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2018-12-09 19:39:03,537 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:03,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:03,537 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:39:03,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:03,537 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:03,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:03,614 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 19:39:03,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:03,614 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:03,614 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:03,614 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:03,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:03,614 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:39:03,620 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:03,620 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 19:39:03,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:03,636 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:03,644 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 19:39:03,644 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:06,133 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 19:39:06,147 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:06,147 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-12-09 19:39:06,147 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:06,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-09 19:39:06,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-09 19:39:06,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-12-09 19:39:06,148 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-12-09 19:39:06,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:06,243 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-12-09 19:39:06,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-09 19:39:06,244 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-12-09 19:39:06,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:06,245 INFO L225 Difference]: With dead ends: 52 [2018-12-09 19:39:06,245 INFO L226 Difference]: Without dead ends: 48 [2018-12-09 19:39:06,245 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 19:39:06,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-09 19:39:06,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-12-09 19:39:06,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-09 19:39:06,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-12-09 19:39:06,249 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-12-09 19:39:06,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:06,249 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-12-09 19:39:06,249 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-09 19:39:06,249 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-12-09 19:39:06,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-09 19:39:06,250 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:06,250 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 19:39:06,250 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:06,251 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:06,251 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2018-12-09 19:39:06,251 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:06,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:06,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:06,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:06,252 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:06,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:06,345 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 19:39:06,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:06,345 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:06,345 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:06,345 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:06,345 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:06,345 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:39:06,351 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 19:39:06,351 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 19:39:06,369 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-09 19:39:06,370 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:39:06,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:06,380 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 19:39:06,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:09,702 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 19:39:09,716 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:09,716 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-12-09 19:39:09,717 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:09,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-09 19:39:09,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-09 19:39:09,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-12-09 19:39:09,717 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-12-09 19:39:09,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:09,834 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-12-09 19:39:09,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-09 19:39:09,834 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-12-09 19:39:09,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:09,835 INFO L225 Difference]: With dead ends: 55 [2018-12-09 19:39:09,835 INFO L226 Difference]: Without dead ends: 51 [2018-12-09 19:39:09,835 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 19:39:09,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-12-09 19:39:09,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-12-09 19:39:09,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-09 19:39:09,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-12-09 19:39:09,838 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-12-09 19:39:09,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:09,838 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-12-09 19:39:09,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-09 19:39:09,838 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-12-09 19:39:09,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-12-09 19:39:09,838 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:09,838 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 19:39:09,839 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:09,839 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:09,839 INFO L82 PathProgramCache]: Analyzing trace with hash -986521316, now seen corresponding path program 12 times [2018-12-09 19:39:09,839 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:09,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:09,839 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:39:09,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:09,839 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:09,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:09,925 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 19:39:09,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:09,926 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:09,926 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:09,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:09,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:09,926 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:39:09,933 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 19:39:09,933 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 19:39:09,951 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 19:39:09,952 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:39:09,954 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:09,970 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 19:39:09,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:14,174 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 19:39:14,189 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:14,189 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2018-12-09 19:39:14,189 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:14,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-09 19:39:14,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-09 19:39:14,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2018-12-09 19:39:14,190 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-12-09 19:39:14,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:14,315 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-12-09 19:39:14,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-09 19:39:14,315 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-12-09 19:39:14,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:14,316 INFO L225 Difference]: With dead ends: 58 [2018-12-09 19:39:14,316 INFO L226 Difference]: Without dead ends: 54 [2018-12-09 19:39:14,316 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 19:39:14,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-09 19:39:14,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-12-09 19:39:14,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-09 19:39:14,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-12-09 19:39:14,319 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-12-09 19:39:14,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:14,320 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-12-09 19:39:14,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-09 19:39:14,320 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-12-09 19:39:14,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-12-09 19:39:14,321 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:14,321 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 19:39:14,321 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:14,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:14,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1073897604, now seen corresponding path program 13 times [2018-12-09 19:39:14,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:14,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:14,322 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:39:14,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:14,322 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:14,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:14,432 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 19:39:14,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:14,432 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:14,432 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:14,433 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:14,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:14,433 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:39:14,438 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:14,438 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 19:39:14,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:14,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:14,466 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 19:39:14,466 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:20,506 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 19:39:20,520 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:20,521 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2018-12-09 19:39:20,521 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:20,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-09 19:39:20,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-09 19:39:20,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2018-12-09 19:39:20,521 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-12-09 19:39:20,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:20,645 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-12-09 19:39:20,645 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-09 19:39:20,645 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-12-09 19:39:20,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:20,646 INFO L225 Difference]: With dead ends: 61 [2018-12-09 19:39:20,646 INFO L226 Difference]: Without dead ends: 57 [2018-12-09 19:39:20,647 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 19:39:20,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-12-09 19:39:20,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-12-09 19:39:20,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-09 19:39:20,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-12-09 19:39:20,650 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-12-09 19:39:20,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:20,650 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-12-09 19:39:20,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-09 19:39:20,650 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-12-09 19:39:20,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-09 19:39:20,651 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:20,651 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 19:39:20,651 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:20,651 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:20,651 INFO L82 PathProgramCache]: Analyzing trace with hash -1572648100, now seen corresponding path program 14 times [2018-12-09 19:39:20,652 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:20,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:20,652 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:20,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:20,652 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:20,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:20,758 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 19:39:20,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:20,758 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:20,758 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:20,758 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:20,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:20,758 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:39:20,767 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 19:39:20,767 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 19:39:20,799 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-09 19:39:20,799 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:39:20,801 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:20,817 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 19:39:20,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:27,543 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 19:39:27,557 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:27,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 35 [2018-12-09 19:39:27,558 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:27,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-09 19:39:27,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-09 19:39:27,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2018-12-09 19:39:27,559 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-12-09 19:39:27,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:27,695 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-12-09 19:39:27,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-09 19:39:27,695 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-12-09 19:39:27,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:27,695 INFO L225 Difference]: With dead ends: 64 [2018-12-09 19:39:27,696 INFO L226 Difference]: Without dead ends: 60 [2018-12-09 19:39:27,696 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 163 SyntacticMatches, 30 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=803, Invalid=1647, Unknown=0, NotChecked=0, Total=2450 [2018-12-09 19:39:27,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-12-09 19:39:27,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-12-09 19:39:27,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-09 19:39:27,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-12-09 19:39:27,699 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-12-09 19:39:27,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:27,699 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-12-09 19:39:27,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-09 19:39:27,699 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-12-09 19:39:27,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-12-09 19:39:27,699 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:27,699 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 19:39:27,699 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:27,699 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:27,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1584030916, now seen corresponding path program 15 times [2018-12-09 19:39:27,700 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:27,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:27,700 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:39:27,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:27,700 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:27,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:27,812 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 19:39:27,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:27,812 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:27,812 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:27,812 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:27,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:27,812 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/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 19:39:27,818 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 19:39:27,819 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 19:39:27,836 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 19:39:27,836 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:39:27,838 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:27,849 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 19:39:27,849 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:36,609 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-12-09 19:39:36,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:36,628 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 35] total 37 [2018-12-09 19:39:36,628 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:36,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-09 19:39:36,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-09 19:39:36,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=988, Unknown=0, NotChecked=0, Total=1332 [2018-12-09 19:39:36,629 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 20 states. [2018-12-09 19:39:36,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:36,788 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-12-09 19:39:36,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-09 19:39:36,789 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 103 [2018-12-09 19:39:36,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:36,789 INFO L225 Difference]: With dead ends: 67 [2018-12-09 19:39:36,789 INFO L226 Difference]: Without dead ends: 63 [2018-12-09 19:39:36,790 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 173 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=904, Invalid=1852, Unknown=0, NotChecked=0, Total=2756 [2018-12-09 19:39:36,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-09 19:39:36,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-12-09 19:39:36,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-09 19:39:36,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-12-09 19:39:36,792 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-12-09 19:39:36,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:36,792 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-12-09 19:39:36,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-09 19:39:36,793 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-12-09 19:39:36,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-12-09 19:39:36,793 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:36,793 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 19:39:36,793 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:36,793 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:36,793 INFO L82 PathProgramCache]: Analyzing trace with hash 1066046876, now seen corresponding path program 16 times [2018-12-09 19:39:36,793 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:36,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:36,794 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:39:36,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:36,794 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:36,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:36,922 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-12-09 19:39:36,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:36,923 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:36,923 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:36,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:36,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:36,923 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 19:39:36,929 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:36,929 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 19:39:36,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:36,953 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:36,964 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-12-09 19:39:36,965 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:38,432 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-12-09 19:39:47,352 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-12-09 19:39:47,366 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:39:47,367 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 37] total 39 [2018-12-09 19:39:47,367 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:39:47,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-09 19:39:47,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-09 19:39:47,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1100, Unknown=0, NotChecked=0, Total=1482 [2018-12-09 19:39:47,368 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-12-09 19:39:47,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:39:47,536 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2018-12-09 19:39:47,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-09 19:39:47,536 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-12-09 19:39:47,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:39:47,537 INFO L225 Difference]: With dead ends: 70 [2018-12-09 19:39:47,537 INFO L226 Difference]: Without dead ends: 66 [2018-12-09 19:39:47,538 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 183 SyntacticMatches, 34 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1011, Invalid=2069, Unknown=0, NotChecked=0, Total=3080 [2018-12-09 19:39:47,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-12-09 19:39:47,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-12-09 19:39:47,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-09 19:39:47,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-12-09 19:39:47,540 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2018-12-09 19:39:47,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:39:47,540 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-12-09 19:39:47,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-09 19:39:47,540 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-12-09 19:39:47,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-12-09 19:39:47,541 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:39:47,541 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:39:47,541 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:39:47,541 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:39:47,541 INFO L82 PathProgramCache]: Analyzing trace with hash 1300351236, now seen corresponding path program 17 times [2018-12-09 19:39:47,541 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:39:47,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,542 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:39:47,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:39:47,542 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:39:47,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:39:47,696 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-12-09 19:39:47,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,697 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:39:47,697 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:39:47,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:39:47,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:39:47,697 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 19:39:47,703 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 19:39:47,703 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 19:39:47,734 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-09 19:39:47,734 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:39:47,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:39:47,750 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-12-09 19:39:47,750 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:39:52,112 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-09 19:39:52,222 WARN L180 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-09 19:40:02,348 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-12-09 19:40:02,363 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:40:02,364 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 39] total 41 [2018-12-09 19:40:02,364 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:40:02,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-09 19:40:02,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-09 19:40:02,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=1218, Unknown=0, NotChecked=0, Total=1640 [2018-12-09 19:40:02,364 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 22 states. [2018-12-09 19:40:02,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:40:02,539 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-12-09 19:40:02,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-09 19:40:02,539 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2018-12-09 19:40:02,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:40:02,540 INFO L225 Difference]: With dead ends: 73 [2018-12-09 19:40:02,540 INFO L226 Difference]: Without dead ends: 69 [2018-12-09 19:40:02,541 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 193 SyntacticMatches, 36 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1124, Invalid=2298, Unknown=0, NotChecked=0, Total=3422 [2018-12-09 19:40:02,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-12-09 19:40:02,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-12-09 19:40:02,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-09 19:40:02,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-12-09 19:40:02,544 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2018-12-09 19:40:02,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:40:02,544 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-12-09 19:40:02,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-09 19:40:02,544 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-12-09 19:40:02,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-12-09 19:40:02,545 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:40:02,545 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:40:02,545 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:40:02,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:40:02,546 INFO L82 PathProgramCache]: Analyzing trace with hash 227065820, now seen corresponding path program 18 times [2018-12-09 19:40:02,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:40:02,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:40:02,546 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:40:02,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:40:02,546 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:40:02,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:40:02,695 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-12-09 19:40:02,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:40:02,695 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:40:02,700 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:40:02,700 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:40:02,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:40:02,700 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 19:40:02,706 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 19:40:02,706 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 19:40:02,727 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 19:40:02,727 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:40:02,729 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:40:02,742 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-12-09 19:40:02,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:40:17,131 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2018-12-09 19:40:17,146 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:40:17,146 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 41] total 43 [2018-12-09 19:40:17,147 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:40:17,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-09 19:40:17,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-09 19:40:17,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=1342, Unknown=0, NotChecked=0, Total=1806 [2018-12-09 19:40:17,147 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 23 states. [2018-12-09 19:40:17,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:40:17,349 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2018-12-09 19:40:17,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-09 19:40:17,349 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2018-12-09 19:40:17,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:40:17,349 INFO L225 Difference]: With dead ends: 76 [2018-12-09 19:40:17,350 INFO L226 Difference]: Without dead ends: 72 [2018-12-09 19:40:17,350 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 203 SyntacticMatches, 38 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1243, Invalid=2539, Unknown=0, NotChecked=0, Total=3782 [2018-12-09 19:40:17,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-12-09 19:40:17,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-12-09 19:40:17,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-12-09 19:40:17,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-12-09 19:40:17,352 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2018-12-09 19:40:17,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:40:17,353 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-12-09 19:40:17,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-09 19:40:17,353 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-12-09 19:40:17,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-12-09 19:40:17,353 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:40:17,353 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:40:17,353 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:40:17,353 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:40:17,353 INFO L82 PathProgramCache]: Analyzing trace with hash -479687356, now seen corresponding path program 19 times [2018-12-09 19:40:17,353 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:40:17,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:40:17,354 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:40:17,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:40:17,354 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:40:17,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:40:17,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-12-09 19:40:17,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:40:17,516 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:40:17,516 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:40:17,516 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:40:17,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:40:17,516 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 19:40:17,522 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:40:17,522 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 19:40:17,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:40:17,545 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:40:17,558 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-12-09 19:40:17,558 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:40:21,841 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2018-12-09 19:40:21,955 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2018-12-09 19:40:22,080 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-12-09 19:40:22,195 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2018-12-09 19:40:26,615 WARN L180 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2018-12-09 19:40:29,267 WARN L180 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-09 19:40:29,381 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2018-12-09 19:40:38,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-12-09 19:40:38,443 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:40:38,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 43] total 44 [2018-12-09 19:40:38,444 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:40:38,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-09 19:40:38,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-09 19:40:38,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=505, Invalid=1387, Unknown=0, NotChecked=0, Total=1892 [2018-12-09 19:40:38,445 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 24 states. [2018-12-09 19:40:38,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:40:38,732 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-12-09 19:40:38,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-09 19:40:38,732 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2018-12-09 19:40:38,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:40:38,733 INFO L225 Difference]: With dead ends: 79 [2018-12-09 19:40:38,733 INFO L226 Difference]: Without dead ends: 75 [2018-12-09 19:40:38,735 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 213 SyntacticMatches, 41 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1121 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1365, Invalid=2667, Unknown=0, NotChecked=0, Total=4032 [2018-12-09 19:40:38,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-09 19:40:38,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-12-09 19:40:38,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-09 19:40:38,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-12-09 19:40:38,739 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2018-12-09 19:40:38,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:40:38,740 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-12-09 19:40:38,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-09 19:40:38,740 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-12-09 19:40:38,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-12-09 19:40:38,741 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:40:38,741 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:40:38,741 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:40:38,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:40:38,742 INFO L82 PathProgramCache]: Analyzing trace with hash -1598174692, now seen corresponding path program 20 times [2018-12-09 19:40:38,742 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:40:38,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:40:38,743 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 19:40:38,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:40:38,743 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:40:38,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:40:39,692 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 649 refuted. 0 times theorem prover too weak. 571 trivial. 0 not checked. [2018-12-09 19:40:39,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:40:39,692 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:40:39,693 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:40:39,693 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:40:39,693 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:40:39,693 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 19:40:39,706 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 19:40:39,707 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 19:40:39,765 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-09 19:40:39,765 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:40:39,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:40:40,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 39 proven. 610 refuted. 0 times theorem prover too weak. 571 trivial. 0 not checked. [2018-12-09 19:40:40,016 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:40:46,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 649 refuted. 0 times theorem prover too weak. 571 trivial. 0 not checked. [2018-12-09 19:40:46,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:40:46,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 56 [2018-12-09 19:40:46,371 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:40:46,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-09 19:40:46,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-09 19:40:46,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=2955, Unknown=0, NotChecked=0, Total=3080 [2018-12-09 19:40:46,372 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 53 states. [2018-12-09 19:40:49,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:40:49,086 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2018-12-09 19:40:49,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-09 19:40:49,087 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 133 [2018-12-09 19:40:49,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:40:49,088 INFO L225 Difference]: With dead ends: 82 [2018-12-09 19:40:49,088 INFO L226 Difference]: Without dead ends: 78 [2018-12-09 19:40:49,089 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 215 SyntacticMatches, 64 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=582, Invalid=8924, Unknown=0, NotChecked=0, Total=9506 [2018-12-09 19:40:49,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-12-09 19:40:49,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-12-09 19:40:49,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-09 19:40:49,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-12-09 19:40:49,093 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 133 [2018-12-09 19:40:49,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:40:49,093 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-12-09 19:40:49,093 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-09 19:40:49,094 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-12-09 19:40:49,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-12-09 19:40:49,094 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 19:40:49,094 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 19:40:49,095 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 19:40:49,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 19:40:49,095 INFO L82 PathProgramCache]: Analyzing trace with hash 1648275844, now seen corresponding path program 21 times [2018-12-09 19:40:49,095 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 19:40:49,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:40:49,096 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 19:40:49,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 19:40:49,096 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 19:40:49,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 19:40:49,280 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 672 proven. 41 refuted. 0 times theorem prover too weak. 631 trivial. 0 not checked. [2018-12-09 19:40:49,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:40:49,280 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 19:40:49,280 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 19:40:49,280 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 19:40:49,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 19:40:49,280 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 19:40:49,286 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 19:40:49,286 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 19:40:49,311 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 19:40:49,311 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 19:40:49,313 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 19:40:49,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 672 proven. 41 refuted. 0 times theorem prover too weak. 631 trivial. 0 not checked. [2018-12-09 19:40:49,332 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 19:40:54,534 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-09 19:40:54,648 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2018-12-09 19:40:54,754 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2018-12-09 19:40:57,513 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2018-12-09 19:40:57,632 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2018-12-09 19:41:12,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 672 proven. 441 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-12-09 19:41:12,065 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 19:41:12,065 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 45] total 46 [2018-12-09 19:41:12,065 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 19:41:12,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-09 19:41:12,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-09 19:41:12,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=551, Invalid=1519, Unknown=0, NotChecked=0, Total=2070 [2018-12-09 19:41:12,066 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 25 states. [2018-12-09 19:41:12,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 19:41:12,229 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2018-12-09 19:41:12,230 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-09 19:41:12,230 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 139 [2018-12-09 19:41:12,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 19:41:12,230 INFO L225 Difference]: With dead ends: 78 [2018-12-09 19:41:12,230 INFO L226 Difference]: Without dead ends: 0 [2018-12-09 19:41:12,231 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 256 SyntacticMatches, 43 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1240 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1496, Invalid=2926, Unknown=0, NotChecked=0, Total=4422 [2018-12-09 19:41:12,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-12-09 19:41:12,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-12-09 19:41:12,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-12-09 19:41:12,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-12-09 19:41:12,232 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 139 [2018-12-09 19:41:12,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 19:41:12,232 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-12-09 19:41:12,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-09 19:41:12,232 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-12-09 19:41:12,232 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-09 19:41:12,235 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-12-09 19:41:12,257 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-12-09 19:41:12,257 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-12-09 19:41:12,257 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-12-09 19:41:12,257 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-12-09 19:41:12,257 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-12-09 19:41:12,257 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-12-09 19:41:12,257 INFO L448 ceAbstractionStarter]: For program point sumEXIT(lines 3 9) no Hoare annotation was computed. [2018-12-09 19:41:12,257 INFO L444 ceAbstractionStarter]: At program point L7(line 7) the Hoare annotation is: (and (<= |sum_#in~m| sum_~m) (<= sum_~m |sum_#in~m|) (<= sum_~n |sum_#in~n|) (< 0 sum_~n) (<= |sum_#in~n| sum_~n)) [2018-12-09 19:41:12,257 INFO L448 ceAbstractionStarter]: For program point L7-1(line 7) no Hoare annotation was computed. [2018-12-09 19:41:12,257 INFO L448 ceAbstractionStarter]: For program point L4(lines 4 8) no Hoare annotation was computed. [2018-12-09 19:41:12,257 INFO L448 ceAbstractionStarter]: For program point sumFINAL(lines 3 9) no Hoare annotation was computed. [2018-12-09 19:41:12,257 INFO L451 ceAbstractionStarter]: At program point sumENTRY(lines 3 9) the Hoare annotation is: true [2018-12-09 19:41:12,257 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 11 18) the Hoare annotation is: true [2018-12-09 19:41:12,257 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 11 18) no Hoare annotation was computed. [2018-12-09 19:41:12,257 INFO L448 ceAbstractionStarter]: For program point L16(line 16) no Hoare annotation was computed. [2018-12-09 19:41:12,257 INFO L448 ceAbstractionStarter]: For program point L15(lines 15 17) no Hoare annotation was computed. [2018-12-09 19:41:12,257 INFO L444 ceAbstractionStarter]: At program point L14(line 14) the Hoare annotation is: (and (<= main_~a~0 20) (<= 20 main_~a~0)) [2018-12-09 19:41:12,257 INFO L448 ceAbstractionStarter]: For program point L14-1(line 14) no Hoare annotation was computed. [2018-12-09 19:41:12,258 INFO L448 ceAbstractionStarter]: For program point L15-2(lines 11 18) no Hoare annotation was computed. [2018-12-09 19:41:12,258 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16) no Hoare annotation was computed. [2018-12-09 19:41:12,259 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 07:41:12 BoogieIcfgContainer [2018-12-09 19:41:12,259 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-09 19:41:12,260 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-09 19:41:12,260 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-09 19:41:12,260 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-09 19:41:12,260 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 07:38:54" (3/4) ... [2018-12-09 19:41:12,262 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-12-09 19:41:12,266 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-12-09 19:41:12,267 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure sum [2018-12-09 19:41:12,267 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-12-09 19:41:12,276 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-12-09 19:41:12,276 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2018-12-09 19:41:12,276 INFO L905 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-12-09 19:41:12,298 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_906d7f60-0a2b-4458-839d-545f92d2dafd/bin-2019/utaipan/witness.graphml [2018-12-09 19:41:12,298 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-09 19:41:12,298 INFO L168 Benchmark]: Toolchain (without parser) took 137697.69 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 217.1 MB). Free memory was 950.8 MB in the beginning and 1.2 GB in the end (delta: -209.1 MB). Peak memory consumption was 423.9 MB. Max. memory is 11.5 GB. [2018-12-09 19:41:12,299 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 976.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 19:41:12,299 INFO L168 Benchmark]: CACSL2BoogieTranslator took 116.73 ms. Allocated memory is still 1.0 GB. Free memory was 950.8 MB in the beginning and 942.7 MB in the end (delta: 8.1 MB). Peak memory consumption was 8.1 MB. Max. memory is 11.5 GB. [2018-12-09 19:41:12,299 INFO L168 Benchmark]: Boogie Procedure Inliner took 10.85 ms. Allocated memory is still 1.0 GB. Free memory is still 940.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 19:41:12,299 INFO L168 Benchmark]: Boogie Preprocessor took 9.65 ms. Allocated memory is still 1.0 GB. Free memory is still 940.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 19:41:12,299 INFO L168 Benchmark]: RCFGBuilder took 132.97 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 107.0 MB). Free memory was 940.0 MB in the beginning and 1.1 GB in the end (delta: -155.9 MB). Peak memory consumption was 15.8 MB. Max. memory is 11.5 GB. [2018-12-09 19:41:12,300 INFO L168 Benchmark]: TraceAbstraction took 137386.55 ms. Allocated memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: 116.4 MB). Free memory was 1.1 GB in the beginning and 751.3 MB in the end (delta: 341.9 MB). Peak memory consumption was 458.3 MB. Max. memory is 11.5 GB. [2018-12-09 19:41:12,300 INFO L168 Benchmark]: Witness Printer took 38.36 ms. Allocated memory was 1.3 GB in the beginning and 1.2 GB in the end (delta: -6.3 MB). Free memory was 751.3 MB in the beginning and 1.2 GB in the end (delta: -408.6 MB). Peak memory consumption was 1.1 MB. Max. memory is 11.5 GB. [2018-12-09 19:41:12,301 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 976.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 116.73 ms. Allocated memory is still 1.0 GB. Free memory was 950.8 MB in the beginning and 942.7 MB in the end (delta: 8.1 MB). Peak memory consumption was 8.1 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 10.85 ms. Allocated memory is still 1.0 GB. Free memory is still 940.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 9.65 ms. Allocated memory is still 1.0 GB. Free memory is still 940.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 132.97 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 107.0 MB). Free memory was 940.0 MB in the beginning and 1.1 GB in the end (delta: -155.9 MB). Peak memory consumption was 15.8 MB. Max. memory is 11.5 GB. * TraceAbstraction took 137386.55 ms. Allocated memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: 116.4 MB). Free memory was 1.1 GB in the beginning and 751.3 MB in the end (delta: 341.9 MB). Peak memory consumption was 458.3 MB. Max. memory is 11.5 GB. * Witness Printer took 38.36 ms. Allocated memory was 1.3 GB in the beginning and 1.2 GB in the end (delta: -6.3 MB). Free memory was 751.3 MB in the beginning and 1.2 GB in the end (delta: -408.6 MB). Peak memory consumption was 1.1 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 16]: 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, 137.3s OverallTime, 22 OverallIterations, 22 TraceHistogramMax, 5.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 324 SDtfs, 576 SDslu, 3145 SDs, 0 SdLazy, 3682 SolverSat, 112 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4184 GetRequests, 2810 SyntacticMatches, 526 SemanticMatches, 848 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10680 ImplicationChecksByTransitivity, 10.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=78occurred in iteration=21, 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, 22 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 28 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 3 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 130.7s InterpolantComputationTime, 3331 NumberOfCodeBlocks, 3331 NumberOfCodeBlocksAsserted, 127 NumberOfCheckSat, 4926 ConstructedInterpolants, 0 QuantifiedInterpolants, 1627668 SizeOfPredicates, 278 NumberOfNonLiveVariables, 4914 ConjunctsInSsa, 677 ConjunctsInUnsatCore, 64 InterpolantComputations, 1 PerfectInterpolantSequences, 14191/30492 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...