./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i25_o25_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aa418289 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i25_o25_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 980109aaf5797fcdc56688cd1127831babfd66a2 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-aa41828 [2018-11-23 07:52:59,805 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-23 07:52:59,806 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-23 07:52:59,814 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-23 07:52:59,814 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-23 07:52:59,815 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-23 07:52:59,815 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-23 07:52:59,816 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-23 07:52:59,817 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-23 07:52:59,818 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-23 07:52:59,819 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-23 07:52:59,819 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-23 07:52:59,820 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-23 07:52:59,820 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-23 07:52:59,821 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-23 07:52:59,822 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-23 07:52:59,822 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-23 07:52:59,823 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-23 07:52:59,825 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-23 07:52:59,826 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-23 07:52:59,827 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-23 07:52:59,827 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-23 07:52:59,829 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-23 07:52:59,829 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-23 07:52:59,829 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-23 07:52:59,830 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-23 07:52:59,831 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-23 07:52:59,831 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-23 07:52:59,832 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-23 07:52:59,833 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-23 07:52:59,833 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-23 07:52:59,834 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-23 07:52:59,834 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-23 07:52:59,834 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-23 07:52:59,835 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-23 07:52:59,835 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-23 07:52:59,836 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-23 07:52:59,848 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-23 07:52:59,848 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-23 07:52:59,849 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-23 07:52:59,849 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-11-23 07:52:59,849 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-23 07:52:59,849 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-23 07:52:59,849 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-23 07:52:59,849 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-23 07:52:59,849 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-23 07:52:59,849 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-23 07:52:59,849 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-23 07:52:59,849 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-23 07:52:59,850 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-23 07:52:59,850 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-23 07:52:59,850 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-23 07:52:59,850 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-23 07:52:59,850 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-23 07:52:59,850 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-23 07:52:59,851 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-23 07:52:59,851 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-23 07:52:59,851 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-23 07:52:59,851 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-23 07:52:59,851 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-23 07:52:59,851 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-23 07:52:59,851 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-23 07:52:59,852 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-23 07:52:59,852 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-23 07:52:59,852 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-23 07:52:59,852 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-23 07:52:59,852 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-23 07:52:59,852 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-23 07:52:59,852 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-23 07:52:59,853 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-23 07:52:59,853 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-23 07:52:59,853 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-23 07:52:59,853 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-23 07:52:59,853 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-23 07:52:59,853 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_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 980109aaf5797fcdc56688cd1127831babfd66a2 [2018-11-23 07:52:59,876 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-23 07:52:59,884 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-23 07:52:59,886 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-23 07:52:59,887 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-23 07:52:59,887 INFO L276 PluginConnector]: CDTParser initialized [2018-11-23 07:52:59,888 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/id_i25_o25_true-unreach-call_true-termination.c [2018-11-23 07:52:59,923 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/data/7d4d68b7e/e7ff324736c24075b301fec48e229ae2/FLAG741ffed98 [2018-11-23 07:53:00,319 INFO L307 CDTParser]: Found 1 translation units. [2018-11-23 07:53:00,319 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/sv-benchmarks/c/recursive-simple/id_i25_o25_true-unreach-call_true-termination.c [2018-11-23 07:53:00,322 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/data/7d4d68b7e/e7ff324736c24075b301fec48e229ae2/FLAG741ffed98 [2018-11-23 07:53:00,334 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/data/7d4d68b7e/e7ff324736c24075b301fec48e229ae2 [2018-11-23 07:53:00,336 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-23 07:53:00,337 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-23 07:53:00,337 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-23 07:53:00,337 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-23 07:53:00,339 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-23 07:53:00,340 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 07:53:00" (1/1) ... [2018-11-23 07:53:00,341 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33c486bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00, skipping insertion in model container [2018-11-23 07:53:00,342 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 07:53:00" (1/1) ... [2018-11-23 07:53:00,348 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-23 07:53:00,358 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-23 07:53:00,465 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 07:53:00,467 INFO L191 MainTranslator]: Completed pre-run [2018-11-23 07:53:00,475 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-23 07:53:00,483 INFO L195 MainTranslator]: Completed translation [2018-11-23 07:53:00,484 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00 WrapperNode [2018-11-23 07:53:00,484 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-23 07:53:00,484 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-23 07:53:00,484 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-23 07:53:00,485 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-23 07:53:00,490 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00" (1/1) ... [2018-11-23 07:53:00,493 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00" (1/1) ... [2018-11-23 07:53:00,496 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-23 07:53:00,497 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-23 07:53:00,497 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-23 07:53:00,497 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-23 07:53:00,503 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00" (1/1) ... [2018-11-23 07:53:00,503 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00" (1/1) ... [2018-11-23 07:53:00,503 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00" (1/1) ... [2018-11-23 07:53:00,503 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00" (1/1) ... [2018-11-23 07:53:00,505 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00" (1/1) ... [2018-11-23 07:53:00,506 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00" (1/1) ... [2018-11-23 07:53:00,507 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00" (1/1) ... [2018-11-23 07:53:00,508 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-23 07:53:00,508 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-23 07:53:00,508 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-23 07:53:00,508 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-23 07:53:00,509 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:00,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-23 07:53:00,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-23 07:53:00,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-23 07:53:00,584 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-23 07:53:00,584 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-23 07:53:00,584 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-23 07:53:00,584 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-11-23 07:53:00,584 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-11-23 07:53:00,695 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-23 07:53:00,695 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-11-23 07:53:00,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 07:53:00 BoogieIcfgContainer [2018-11-23 07:53:00,696 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-23 07:53:00,696 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-23 07:53:00,696 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-23 07:53:00,698 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-23 07:53:00,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 07:53:00" (1/3) ... [2018-11-23 07:53:00,699 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a4cbf6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 07:53:00, skipping insertion in model container [2018-11-23 07:53:00,699 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 07:53:00" (2/3) ... [2018-11-23 07:53:00,699 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a4cbf6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 07:53:00, skipping insertion in model container [2018-11-23 07:53:00,700 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 07:53:00" (3/3) ... [2018-11-23 07:53:00,701 INFO L112 eAbstractionObserver]: Analyzing ICFG id_i25_o25_true-unreach-call_true-termination.c [2018-11-23 07:53:00,707 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-23 07:53:00,711 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-23 07:53:00,722 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-23 07:53:00,743 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-23 07:53:00,743 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-23 07:53:00,744 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-23 07:53:00,744 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-23 07:53:00,744 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-23 07:53:00,744 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-23 07:53:00,744 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-23 07:53:00,744 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-23 07:53:00,757 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-23 07:53:00,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-23 07:53:00,761 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:00,761 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:00,763 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:00,767 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:00,768 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-11-23 07:53:00,769 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:00,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:00,800 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:00,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:00,800 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:00,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:00,894 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-23 07:53:00,896 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-23 07:53:00,896 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-23 07:53:00,897 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-23 07:53:00,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-23 07:53:00,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-23 07:53:00,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-23 07:53:00,910 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-11-23 07:53:00,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:00,981 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-11-23 07:53:00,982 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-23 07:53:00,983 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-23 07:53:00,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:00,989 INFO L225 Difference]: With dead ends: 30 [2018-11-23 07:53:00,990 INFO L226 Difference]: Without dead ends: 18 [2018-11-23 07:53:00,992 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 [2018-11-23 07:53:01,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-23 07:53:01,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-23 07:53:01,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-23 07:53:01,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-23 07:53:01,023 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-23 07:53:01,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:01,024 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-23 07:53:01,024 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-23 07:53:01,024 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-23 07:53:01,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-23 07:53:01,025 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:01,025 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:01,026 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:01,026 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:01,026 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-11-23 07:53:01,026 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:01,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:01,027 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:01,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:01,027 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:01,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:01,078 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-23 07:53:01,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:01,078 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:01,079 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-11-23 07:53:01,080 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-11-23 07:53:01,104 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-23 07:53:01,104 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-23 07:53:01,212 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-23 07:53:01,212 INFO L272 AbstractInterpreter]: Visited 17 different actions 50 times. Never merged. Widened at 1 different actions 2 times. Performed 106 root evaluator evaluations with a maximum evaluation depth of 3. Performed 106 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-11-23 07:53:01,219 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:01,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-23 07:53:01,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:01,220 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:01,228 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:01,228 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 07:53:01,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:01,245 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:01,268 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-23 07:53:01,268 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:01,448 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-23 07:53:01,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:01,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-11-23 07:53:01,464 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:01,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-23 07:53:01,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-23 07:53:01,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-11-23 07:53:01,466 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-11-23 07:53:01,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:01,519 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-11-23 07:53:01,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-23 07:53:01,519 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-11-23 07:53:01,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:01,520 INFO L225 Difference]: With dead ends: 25 [2018-11-23 07:53:01,520 INFO L226 Difference]: Without dead ends: 21 [2018-11-23 07:53:01,521 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 [2018-11-23 07:53:01,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-23 07:53:01,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-23 07:53:01,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-23 07:53:01,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-23 07:53:01,525 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-11-23 07:53:01,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:01,525 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-23 07:53:01,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-23 07:53:01,526 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-23 07:53:01,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-23 07:53:01,526 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:01,526 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:01,527 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:01,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:01,527 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-11-23 07:53:01,527 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:01,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:01,528 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:01,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:01,528 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:01,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:01,583 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-23 07:53:01,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:01,583 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:01,583 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:01,583 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:01,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:01,583 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:01,592 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 07:53:01,592 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 07:53:01,603 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-23 07:53:01,603 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:53:01,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:01,616 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-23 07:53:01,616 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:01,854 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-23 07:53:01,876 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:01,876 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-11-23 07:53:01,876 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:01,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-23 07:53:01,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-23 07:53:01,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-11-23 07:53:01,877 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-11-23 07:53:01,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:01,918 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-11-23 07:53:01,919 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-23 07:53:01,919 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-11-23 07:53:01,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:01,919 INFO L225 Difference]: With dead ends: 28 [2018-11-23 07:53:01,920 INFO L226 Difference]: Without dead ends: 24 [2018-11-23 07:53:01,920 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-11-23 07:53:01,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-23 07:53:01,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-23 07:53:01,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-23 07:53:01,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-23 07:53:01,923 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-11-23 07:53:01,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:01,924 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-23 07:53:01,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-23 07:53:01,924 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-23 07:53:01,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-23 07:53:01,924 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:01,925 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:01,925 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:01,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:01,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-11-23 07:53:01,925 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:01,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:01,926 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:53:01,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:01,926 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:01,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:01,980 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-23 07:53:01,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:01,981 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:01,981 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:01,981 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:01,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:01,981 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:01,996 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 07:53:01,996 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 07:53:02,006 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 07:53:02,006 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:53:02,008 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:02,019 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-23 07:53:02,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:02,322 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-23 07:53:02,337 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:02,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2018-11-23 07:53:02,338 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:02,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-23 07:53:02,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-23 07:53:02,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-11-23 07:53:02,338 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2018-11-23 07:53:02,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:02,371 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-11-23 07:53:02,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-23 07:53:02,371 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-11-23 07:53:02,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:02,372 INFO L225 Difference]: With dead ends: 31 [2018-11-23 07:53:02,372 INFO L226 Difference]: Without dead ends: 27 [2018-11-23 07:53:02,372 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 [2018-11-23 07:53:02,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-23 07:53:02,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-11-23 07:53:02,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-23 07:53:02,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-11-23 07:53:02,376 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-11-23 07:53:02,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:02,376 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-11-23 07:53:02,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-23 07:53:02,377 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-11-23 07:53:02,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-11-23 07:53:02,377 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:02,377 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:02,377 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:02,377 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:02,378 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-11-23 07:53:02,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:02,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:02,378 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:53:02,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:02,378 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:02,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:02,438 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-23 07:53:02,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:02,439 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:02,443 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:02,443 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:02,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:02,443 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:02,459 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:02,460 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 07:53:02,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:02,470 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:02,481 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-23 07:53:02,481 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:02,938 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-23 07:53:02,953 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:02,953 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2018-11-23 07:53:02,953 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:02,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-23 07:53:02,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-23 07:53:02,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2018-11-23 07:53:02,954 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-11-23 07:53:03,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:03,006 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-11-23 07:53:03,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-23 07:53:03,010 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-11-23 07:53:03,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:03,011 INFO L225 Difference]: With dead ends: 34 [2018-11-23 07:53:03,011 INFO L226 Difference]: Without dead ends: 30 [2018-11-23 07:53:03,012 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 [2018-11-23 07:53:03,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-23 07:53:03,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-23 07:53:03,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-23 07:53:03,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-11-23 07:53:03,016 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-11-23 07:53:03,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:03,016 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-11-23 07:53:03,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-23 07:53:03,016 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-11-23 07:53:03,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-23 07:53:03,017 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:03,017 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:03,017 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:03,017 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:03,017 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-11-23 07:53:03,018 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:03,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:03,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:03,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:03,018 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:03,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:03,072 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-23 07:53:03,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:03,072 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:03,072 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:03,072 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:03,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:03,072 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:03,078 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 07:53:03,078 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 07:53:03,089 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-23 07:53:03,089 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:53:03,091 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:03,108 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-23 07:53:03,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:03,712 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-23 07:53:03,726 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:03,727 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2018-11-23 07:53:03,727 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:03,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-23 07:53:03,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-23 07:53:03,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-11-23 07:53:03,727 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2018-11-23 07:53:03,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:03,778 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-11-23 07:53:03,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-23 07:53:03,778 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2018-11-23 07:53:03,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:03,778 INFO L225 Difference]: With dead ends: 37 [2018-11-23 07:53:03,778 INFO L226 Difference]: Without dead ends: 33 [2018-11-23 07:53:03,779 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 [2018-11-23 07:53:03,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-23 07:53:03,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-23 07:53:03,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-23 07:53:03,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-11-23 07:53:03,783 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2018-11-23 07:53:03,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:03,783 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-11-23 07:53:03,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-23 07:53:03,784 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-11-23 07:53:03,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-23 07:53:03,784 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:03,784 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:03,784 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:03,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:03,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2018-11-23 07:53:03,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:03,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:03,785 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:53:03,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:03,785 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:03,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:03,862 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-23 07:53:03,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:03,862 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:03,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:03,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:03,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:03,862 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:03,868 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 07:53:03,868 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 07:53:03,878 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 07:53:03,878 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:53:03,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:03,892 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-23 07:53:03,892 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:04,721 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-23 07:53:04,736 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:04,736 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2018-11-23 07:53:04,736 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:04,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-23 07:53:04,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-23 07:53:04,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2018-11-23 07:53:04,737 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2018-11-23 07:53:04,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:04,793 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2018-11-23 07:53:04,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-23 07:53:04,793 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2018-11-23 07:53:04,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:04,794 INFO L225 Difference]: With dead ends: 40 [2018-11-23 07:53:04,794 INFO L226 Difference]: Without dead ends: 36 [2018-11-23 07:53:04,794 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 [2018-11-23 07:53:04,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-23 07:53:04,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-23 07:53:04,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-23 07:53:04,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-11-23 07:53:04,797 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2018-11-23 07:53:04,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:04,797 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-11-23 07:53:04,797 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-23 07:53:04,797 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-11-23 07:53:04,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-23 07:53:04,798 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:04,798 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:04,798 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:04,798 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:04,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2018-11-23 07:53:04,798 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:04,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:04,799 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:53:04,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:04,799 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:04,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:04,866 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-23 07:53:04,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:04,866 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:04,867 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:04,867 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:04,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:04,867 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:04,876 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:04,876 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 07:53:04,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:04,887 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:04,895 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-11-23 07:53:04,895 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:06,079 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-23 07:53:06,100 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:06,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2018-11-23 07:53:06,100 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:06,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-23 07:53:06,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-23 07:53:06,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-11-23 07:53:06,101 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2018-11-23 07:53:06,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:06,184 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-11-23 07:53:06,185 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-23 07:53:06,185 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2018-11-23 07:53:06,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:06,186 INFO L225 Difference]: With dead ends: 43 [2018-11-23 07:53:06,186 INFO L226 Difference]: Without dead ends: 39 [2018-11-23 07:53:06,186 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 [2018-11-23 07:53:06,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-11-23 07:53:06,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-11-23 07:53:06,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-23 07:53:06,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-11-23 07:53:06,189 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2018-11-23 07:53:06,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:06,190 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-11-23 07:53:06,190 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-23 07:53:06,190 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-11-23 07:53:06,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-11-23 07:53:06,190 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:06,191 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:06,191 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:06,191 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:06,191 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2018-11-23 07:53:06,191 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:06,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:06,192 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:06,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:06,192 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:06,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:06,283 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-23 07:53:06,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:06,284 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:06,284 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:06,284 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:06,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:06,284 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:06,290 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 07:53:06,290 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 07:53:06,309 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-23 07:53:06,309 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:53:06,311 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:06,338 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-23 07:53:06,338 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:07,873 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-23 07:53:07,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:07,888 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2018-11-23 07:53:07,888 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:07,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-23 07:53:07,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-23 07:53:07,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-11-23 07:53:07,889 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2018-11-23 07:53:07,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:07,974 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2018-11-23 07:53:07,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-23 07:53:07,974 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-11-23 07:53:07,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:07,975 INFO L225 Difference]: With dead ends: 46 [2018-11-23 07:53:07,975 INFO L226 Difference]: Without dead ends: 42 [2018-11-23 07:53:07,976 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 [2018-11-23 07:53:07,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-11-23 07:53:07,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-11-23 07:53:07,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-23 07:53:07,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-11-23 07:53:07,980 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2018-11-23 07:53:07,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:07,980 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-11-23 07:53:07,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-23 07:53:07,980 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-11-23 07:53:07,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-23 07:53:07,981 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:07,981 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:07,981 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:07,981 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:07,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2018-11-23 07:53:07,982 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:07,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:07,982 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:53:07,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:07,982 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:07,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:08,058 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-23 07:53:08,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:08,058 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:08,058 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:08,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:08,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:08,059 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:08,064 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 07:53:08,064 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 07:53:08,077 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 07:53:08,077 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:53:08,080 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:08,093 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-11-23 07:53:08,093 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:10,030 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-23 07:53:10,044 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:10,044 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2018-11-23 07:53:10,045 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:10,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-23 07:53:10,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-23 07:53:10,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2018-11-23 07:53:10,045 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2018-11-23 07:53:10,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:10,116 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-11-23 07:53:10,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-23 07:53:10,117 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2018-11-23 07:53:10,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:10,120 INFO L225 Difference]: With dead ends: 49 [2018-11-23 07:53:10,120 INFO L226 Difference]: Without dead ends: 45 [2018-11-23 07:53:10,121 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 [2018-11-23 07:53:10,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-23 07:53:10,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-11-23 07:53:10,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-23 07:53:10,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-11-23 07:53:10,123 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2018-11-23 07:53:10,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:10,124 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-11-23 07:53:10,124 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-23 07:53:10,124 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-11-23 07:53:10,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-11-23 07:53:10,125 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:10,125 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:10,125 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:10,125 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:10,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2018-11-23 07:53:10,125 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:10,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:10,126 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:53:10,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:10,126 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:10,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:10,227 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-23 07:53:10,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:10,227 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:10,227 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:10,227 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:10,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:10,227 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:10,233 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:10,233 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 07:53:10,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:10,248 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:10,269 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-11-23 07:53:10,269 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:12,756 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-11-23 07:53:12,771 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:12,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2018-11-23 07:53:12,771 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:12,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-23 07:53:12,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-23 07:53:12,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2018-11-23 07:53:12,772 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2018-11-23 07:53:12,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:12,864 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2018-11-23 07:53:12,865 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-23 07:53:12,865 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2018-11-23 07:53:12,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:12,865 INFO L225 Difference]: With dead ends: 52 [2018-11-23 07:53:12,865 INFO L226 Difference]: Without dead ends: 48 [2018-11-23 07:53:12,866 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 [2018-11-23 07:53:12,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-23 07:53:12,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-11-23 07:53:12,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-23 07:53:12,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-11-23 07:53:12,870 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2018-11-23 07:53:12,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:12,870 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-11-23 07:53:12,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-23 07:53:12,870 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-11-23 07:53:12,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-23 07:53:12,871 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:12,871 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:12,871 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:12,871 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:12,871 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2018-11-23 07:53:12,871 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:12,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:12,872 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:12,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:12,872 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:12,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:12,965 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-23 07:53:12,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:12,965 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:12,966 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:12,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:12,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:12,966 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:12,972 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 07:53:12,972 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 07:53:12,987 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-23 07:53:12,987 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:53:12,989 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:13,000 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-11-23 07:53:13,000 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:16,219 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-23 07:53:16,243 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:16,243 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2018-11-23 07:53:16,243 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:16,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-23 07:53:16,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-23 07:53:16,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2018-11-23 07:53:16,244 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2018-11-23 07:53:16,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:16,350 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2018-11-23 07:53:16,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-23 07:53:16,351 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2018-11-23 07:53:16,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:16,351 INFO L225 Difference]: With dead ends: 55 [2018-11-23 07:53:16,351 INFO L226 Difference]: Without dead ends: 51 [2018-11-23 07:53:16,352 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 [2018-11-23 07:53:16,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-23 07:53:16,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-11-23 07:53:16,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-23 07:53:16,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-11-23 07:53:16,356 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2018-11-23 07:53:16,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:16,356 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-11-23 07:53:16,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-23 07:53:16,357 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-11-23 07:53:16,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-11-23 07:53:16,357 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:16,358 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:16,358 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:16,358 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:16,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2018-11-23 07:53:16,358 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:16,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:16,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:53:16,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:16,361 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:16,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:16,470 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-23 07:53:16,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:16,471 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:16,471 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:16,471 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:16,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:16,471 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:16,479 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 07:53:16,480 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 07:53:16,493 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 07:53:16,494 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:53:16,496 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:16,521 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-11-23 07:53:16,522 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:20,789 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-11-23 07:53:20,804 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:20,804 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2018-11-23 07:53:20,804 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:20,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-23 07:53:20,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-23 07:53:20,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2018-11-23 07:53:20,805 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2018-11-23 07:53:20,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:20,950 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2018-11-23 07:53:20,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-23 07:53:20,951 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2018-11-23 07:53:20,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:20,952 INFO L225 Difference]: With dead ends: 58 [2018-11-23 07:53:20,952 INFO L226 Difference]: Without dead ends: 54 [2018-11-23 07:53:20,953 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 143 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2018-11-23 07:53:20,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-23 07:53:20,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-11-23 07:53:20,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-23 07:53:20,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-11-23 07:53:20,957 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2018-11-23 07:53:20,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:20,957 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-11-23 07:53:20,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-23 07:53:20,957 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-11-23 07:53:20,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-11-23 07:53:20,958 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:20,958 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:20,958 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:20,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:20,958 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2018-11-23 07:53:20,959 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:20,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:20,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:53:20,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:20,959 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:20,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:21,076 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-23 07:53:21,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:21,076 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:21,076 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:21,076 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:21,076 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:21,076 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:21,082 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:21,082 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 07:53:21,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:21,099 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:21,114 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-11-23 07:53:21,114 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:26,126 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-23 07:53:26,141 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:26,141 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2018-11-23 07:53:26,141 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:26,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-23 07:53:26,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-23 07:53:26,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2018-11-23 07:53:26,142 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2018-11-23 07:53:26,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:26,261 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2018-11-23 07:53:26,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-23 07:53:26,261 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2018-11-23 07:53:26,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:26,261 INFO L225 Difference]: With dead ends: 61 [2018-11-23 07:53:26,261 INFO L226 Difference]: Without dead ends: 57 [2018-11-23 07:53:26,262 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 [2018-11-23 07:53:26,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-23 07:53:26,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-23 07:53:26,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-23 07:53:26,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-11-23 07:53:26,265 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2018-11-23 07:53:26,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:26,265 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-11-23 07:53:26,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-23 07:53:26,265 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-11-23 07:53:26,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-11-23 07:53:26,265 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:26,266 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:26,266 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:26,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:26,266 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2018-11-23 07:53:26,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:26,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:26,266 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:26,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:26,266 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:26,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:26,384 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-23 07:53:26,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:26,384 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:26,384 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:26,384 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:26,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:26,384 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:26,392 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 07:53:26,392 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 07:53:26,415 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-23 07:53:26,415 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:53:26,417 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:26,430 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2018-11-23 07:53:26,430 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:32,630 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-11-23 07:53:32,645 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:32,645 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 35 [2018-11-23 07:53:32,645 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:32,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-23 07:53:32,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-23 07:53:32,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2018-11-23 07:53:32,646 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2018-11-23 07:53:32,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:32,796 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2018-11-23 07:53:32,796 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-23 07:53:32,796 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2018-11-23 07:53:32,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:32,797 INFO L225 Difference]: With dead ends: 64 [2018-11-23 07:53:32,797 INFO L226 Difference]: Without dead ends: 60 [2018-11-23 07:53:32,798 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 [2018-11-23 07:53:32,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-23 07:53:32,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-11-23 07:53:32,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-23 07:53:32,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-11-23 07:53:32,802 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2018-11-23 07:53:32,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:32,804 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-11-23 07:53:32,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-23 07:53:32,804 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-11-23 07:53:32,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-23 07:53:32,806 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:32,806 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:32,806 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:32,806 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:32,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2018-11-23 07:53:32,807 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:32,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:32,807 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:53:32,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:32,807 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:32,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:32,936 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-23 07:53:32,937 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:32,937 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:32,937 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:32,937 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:32,937 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:32,937 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:32,942 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 07:53:32,943 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 07:53:32,958 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 07:53:32,958 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:53:32,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:32,971 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-11-23 07:53:32,971 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:40,421 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-23 07:53:40,436 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:40,436 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 35] total 37 [2018-11-23 07:53:40,436 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:40,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-23 07:53:40,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-23 07:53:40,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=988, Unknown=0, NotChecked=0, Total=1332 [2018-11-23 07:53:40,437 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 20 states. [2018-11-23 07:53:40,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:40,582 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2018-11-23 07:53:40,582 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-23 07:53:40,582 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 103 [2018-11-23 07:53:40,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:40,583 INFO L225 Difference]: With dead ends: 67 [2018-11-23 07:53:40,583 INFO L226 Difference]: Without dead ends: 63 [2018-11-23 07:53:40,584 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 173 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 752 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=904, Invalid=1852, Unknown=0, NotChecked=0, Total=2756 [2018-11-23 07:53:40,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-11-23 07:53:40,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-11-23 07:53:40,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-23 07:53:40,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-11-23 07:53:40,587 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2018-11-23 07:53:40,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:40,587 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-11-23 07:53:40,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-23 07:53:40,587 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-11-23 07:53:40,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-23 07:53:40,588 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:40,588 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:40,588 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:40,589 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:40,589 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2018-11-23 07:53:40,589 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:40,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:40,589 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:53:40,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:40,590 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:40,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:40,735 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-23 07:53:40,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:40,735 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:40,735 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:40,735 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:40,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:40,735 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:40,742 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:40,742 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 07:53:40,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:40,762 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:40,779 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-11-23 07:53:40,779 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:53:49,745 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-11-23 07:53:49,760 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:53:49,760 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 37] total 39 [2018-11-23 07:53:49,760 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:53:49,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-23 07:53:49,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-23 07:53:49,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1100, Unknown=0, NotChecked=0, Total=1482 [2018-11-23 07:53:49,762 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2018-11-23 07:53:49,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:53:49,925 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2018-11-23 07:53:49,925 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-23 07:53:49,925 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2018-11-23 07:53:49,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:53:49,925 INFO L225 Difference]: With dead ends: 70 [2018-11-23 07:53:49,926 INFO L226 Difference]: Without dead ends: 66 [2018-11-23 07:53:49,926 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 [2018-11-23 07:53:49,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-23 07:53:49,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-11-23 07:53:49,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-23 07:53:49,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-11-23 07:53:49,929 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2018-11-23 07:53:49,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:53:49,930 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-11-23 07:53:49,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-23 07:53:49,930 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-11-23 07:53:49,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-11-23 07:53:49,930 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:53:49,930 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:53:49,931 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:53:49,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:53:49,931 INFO L82 PathProgramCache]: Analyzing trace with hash -464475409, now seen corresponding path program 17 times [2018-11-23 07:53:49,931 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:53:49,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:49,931 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:53:49,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:53:49,932 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:53:49,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:53:50,133 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-11-23 07:53:50,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:50,134 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:53:50,134 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:53:50,134 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:53:50,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:53:50,134 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:53:50,145 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 07:53:50,145 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 07:53:50,191 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-11-23 07:53:50,191 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:53:50,194 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:53:50,211 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-11-23 07:53:50,211 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:54:00,912 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-23 07:54:00,926 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:54:00,926 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 39] total 41 [2018-11-23 07:54:00,926 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:54:00,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-23 07:54:00,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-23 07:54:00,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=1218, Unknown=0, NotChecked=0, Total=1640 [2018-11-23 07:54:00,927 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 22 states. [2018-11-23 07:54:01,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:54:01,085 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2018-11-23 07:54:01,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-23 07:54:01,086 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2018-11-23 07:54:01,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:54:01,086 INFO L225 Difference]: With dead ends: 73 [2018-11-23 07:54:01,086 INFO L226 Difference]: Without dead ends: 69 [2018-11-23 07:54:01,087 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 [2018-11-23 07:54:01,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-23 07:54:01,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-11-23 07:54:01,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-11-23 07:54:01,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-11-23 07:54:01,090 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2018-11-23 07:54:01,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:54:01,090 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-11-23 07:54:01,090 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-23 07:54:01,090 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-11-23 07:54:01,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-11-23 07:54:01,091 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:54:01,091 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:54:01,091 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:54:01,091 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:54:01,092 INFO L82 PathProgramCache]: Analyzing trace with hash 130115453, now seen corresponding path program 18 times [2018-11-23 07:54:01,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:54:01,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:54:01,092 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:54:01,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:54:01,092 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:54:01,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:54:01,251 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-11-23 07:54:01,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:54:01,251 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:54:01,251 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:54:01,252 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:54:01,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:54:01,252 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:54:01,257 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 07:54:01,257 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 07:54:01,275 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 07:54:01,275 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:54:01,277 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:54:01,296 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-11-23 07:54:01,296 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:54:14,010 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2018-11-23 07:54:14,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:54:14,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 41] total 43 [2018-11-23 07:54:14,025 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:54:14,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-23 07:54:14,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-23 07:54:14,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=1342, Unknown=0, NotChecked=0, Total=1806 [2018-11-23 07:54:14,026 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 23 states. [2018-11-23 07:54:14,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:54:14,230 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2018-11-23 07:54:14,231 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-23 07:54:14,231 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2018-11-23 07:54:14,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:54:14,232 INFO L225 Difference]: With dead ends: 76 [2018-11-23 07:54:14,232 INFO L226 Difference]: Without dead ends: 72 [2018-11-23 07:54:14,233 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 203 SyntacticMatches, 38 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1243, Invalid=2539, Unknown=0, NotChecked=0, Total=3782 [2018-11-23 07:54:14,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-11-23 07:54:14,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-11-23 07:54:14,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-11-23 07:54:14,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-11-23 07:54:14,239 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2018-11-23 07:54:14,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:54:14,239 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-11-23 07:54:14,239 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-23 07:54:14,239 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-11-23 07:54:14,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-11-23 07:54:14,240 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:54:14,240 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:54:14,240 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:54:14,240 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:54:14,240 INFO L82 PathProgramCache]: Analyzing trace with hash -2010955025, now seen corresponding path program 19 times [2018-11-23 07:54:14,240 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:54:14,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:54:14,240 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:54:14,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:54:14,240 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:54:14,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:54:14,437 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-11-23 07:54:14,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:54:14,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:54:14,437 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:54:14,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:54:14,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:54:14,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:54:14,443 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:54:14,443 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 07:54:14,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:54:14,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:54:14,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-11-23 07:54:14,474 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:54:29,655 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-11-23 07:54:29,670 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:54:29,670 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 43] total 45 [2018-11-23 07:54:29,670 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:54:29,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-23 07:54:29,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-23 07:54:29,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=1472, Unknown=0, NotChecked=0, Total=1980 [2018-11-23 07:54:29,671 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 24 states. [2018-11-23 07:54:29,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:54:29,849 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-11-23 07:54:29,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-23 07:54:29,849 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2018-11-23 07:54:29,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:54:29,850 INFO L225 Difference]: With dead ends: 79 [2018-11-23 07:54:29,850 INFO L226 Difference]: Without dead ends: 75 [2018-11-23 07:54:29,850 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 213 SyntacticMatches, 40 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1368, Invalid=2792, Unknown=0, NotChecked=0, Total=4160 [2018-11-23 07:54:29,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-23 07:54:29,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2018-11-23 07:54:29,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-11-23 07:54:29,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-11-23 07:54:29,853 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2018-11-23 07:54:29,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:54:29,853 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-11-23 07:54:29,853 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-23 07:54:29,853 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-11-23 07:54:29,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-11-23 07:54:29,853 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:54:29,853 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:54:29,853 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:54:29,854 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:54:29,854 INFO L82 PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 20 times [2018-11-23 07:54:29,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:54:29,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:54:29,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:54:29,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:54:29,854 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:54:29,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:54:30,048 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-11-23 07:54:30,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:54:30,049 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:54:30,049 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:54:30,049 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:54:30,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:54:30,049 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:54:30,055 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 07:54:30,055 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 07:54:30,087 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-11-23 07:54:30,087 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:54:30,090 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:54:30,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2018-11-23 07:54:30,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:54:47,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 1010 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-11-23 07:54:47,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:54:47,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 45] total 47 [2018-11-23 07:54:47,644 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:54:47,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-23 07:54:47,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-23 07:54:47,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=554, Invalid=1608, Unknown=0, NotChecked=0, Total=2162 [2018-11-23 07:54:47,645 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 25 states. [2018-11-23 07:54:47,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:54:47,855 INFO L93 Difference]: Finished difference Result 82 states and 83 transitions. [2018-11-23 07:54:47,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-23 07:54:47,855 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 133 [2018-11-23 07:54:47,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:54:47,855 INFO L225 Difference]: With dead ends: 82 [2018-11-23 07:54:47,856 INFO L226 Difference]: Without dead ends: 78 [2018-11-23 07:54:47,857 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 223 SyntacticMatches, 42 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1302 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1499, Invalid=3057, Unknown=0, NotChecked=0, Total=4556 [2018-11-23 07:54:47,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-11-23 07:54:47,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-11-23 07:54:47,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-11-23 07:54:47,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-11-23 07:54:47,860 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 133 [2018-11-23 07:54:47,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:54:47,860 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-11-23 07:54:47,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-23 07:54:47,860 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-11-23 07:54:47,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-11-23 07:54:47,860 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:54:47,860 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:54:47,861 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:54:47,861 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:54:47,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1226192145, now seen corresponding path program 21 times [2018-11-23 07:54:47,861 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:54:47,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:54:47,861 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:54:47,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:54:47,861 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:54:47,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:54:48,056 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-11-23 07:54:48,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:54:48,057 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:54:48,057 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:54:48,057 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:54:48,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:54:48,057 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/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 [2018-11-23 07:54:48,063 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 07:54:48,063 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 07:54:48,084 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 07:54:48,084 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:54:48,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:54:48,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-11-23 07:54:48,106 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:55:08,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 1113 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-11-23 07:55:08,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:55:08,378 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 47] total 49 [2018-11-23 07:55:08,378 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:55:08,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-23 07:55:08,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-23 07:55:08,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=602, Invalid=1750, Unknown=0, NotChecked=0, Total=2352 [2018-11-23 07:55:08,379 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 26 states. [2018-11-23 07:55:08,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:55:08,627 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2018-11-23 07:55:08,627 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-23 07:55:08,628 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 139 [2018-11-23 07:55:08,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:55:08,628 INFO L225 Difference]: With dead ends: 85 [2018-11-23 07:55:08,628 INFO L226 Difference]: Without dead ends: 81 [2018-11-23 07:55:08,630 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 233 SyntacticMatches, 44 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1430 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1636, Invalid=3334, Unknown=0, NotChecked=0, Total=4970 [2018-11-23 07:55:08,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-23 07:55:08,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2018-11-23 07:55:08,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-11-23 07:55:08,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-11-23 07:55:08,633 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 139 [2018-11-23 07:55:08,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:55:08,634 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-11-23 07:55:08,634 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-23 07:55:08,634 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-11-23 07:55:08,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-11-23 07:55:08,635 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:55:08,635 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:55:08,635 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:55:08,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:55:08,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1155535485, now seen corresponding path program 22 times [2018-11-23 07:55:08,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:55:08,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:55:08,636 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:55:08,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:55:08,636 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:55:08,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:55:08,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-11-23 07:55:08,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:55:08,853 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:55:08,853 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:55:08,853 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:55:08,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:55:08,853 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 07:55:08,862 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:55:08,862 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 07:55:08,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:55:08,886 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:55:08,907 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-11-23 07:55:08,907 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:55:32,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 1221 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2018-11-23 07:55:32,470 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:55:32,470 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 49] total 51 [2018-11-23 07:55:32,470 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:55:32,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-23 07:55:32,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-23 07:55:32,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=1898, Unknown=0, NotChecked=0, Total=2550 [2018-11-23 07:55:32,471 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 27 states. [2018-11-23 07:55:32,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:55:32,748 INFO L93 Difference]: Finished difference Result 88 states and 89 transitions. [2018-11-23 07:55:32,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-23 07:55:32,749 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 145 [2018-11-23 07:55:32,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:55:32,750 INFO L225 Difference]: With dead ends: 88 [2018-11-23 07:55:32,750 INFO L226 Difference]: Without dead ends: 84 [2018-11-23 07:55:32,751 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 243 SyntacticMatches, 46 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1564 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1779, Invalid=3623, Unknown=0, NotChecked=0, Total=5402 [2018-11-23 07:55:32,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-11-23 07:55:32,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-11-23 07:55:32,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-11-23 07:55:32,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2018-11-23 07:55:32,754 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 145 [2018-11-23 07:55:32,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:55:32,754 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2018-11-23 07:55:32,754 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-23 07:55:32,754 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2018-11-23 07:55:32,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-11-23 07:55:32,755 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:55:32,755 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:55:32,755 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:55:32,755 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:55:32,755 INFO L82 PathProgramCache]: Analyzing trace with hash 478692079, now seen corresponding path program 23 times [2018-11-23 07:55:32,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:55:32,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:55:32,756 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:55:32,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:55:32,756 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:55:32,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:55:32,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-11-23 07:55:32,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:55:32,991 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:55:32,991 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:55:32,991 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:55:32,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:55:32,991 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 07:55:32,997 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-23 07:55:32,997 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-23 07:55:33,035 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-11-23 07:55:33,035 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:55:33,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:55:33,058 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-11-23 07:55:33,058 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:55:59,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 1334 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-11-23 07:55:59,938 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:55:59,938 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 51] total 53 [2018-11-23 07:55:59,938 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:55:59,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-23 07:55:59,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-23 07:55:59,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=704, Invalid=2052, Unknown=0, NotChecked=0, Total=2756 [2018-11-23 07:55:59,939 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 28 states. [2018-11-23 07:56:00,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:56:00,193 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2018-11-23 07:56:00,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-23 07:56:00,193 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 151 [2018-11-23 07:56:00,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:56:00,194 INFO L225 Difference]: With dead ends: 91 [2018-11-23 07:56:00,194 INFO L226 Difference]: Without dead ends: 87 [2018-11-23 07:56:00,195 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 253 SyntacticMatches, 48 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1704 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1928, Invalid=3924, Unknown=0, NotChecked=0, Total=5852 [2018-11-23 07:56:00,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-23 07:56:00,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-11-23 07:56:00,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-11-23 07:56:00,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-11-23 07:56:00,197 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 151 [2018-11-23 07:56:00,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:56:00,198 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-11-23 07:56:00,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-23 07:56:00,198 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-11-23 07:56:00,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-11-23 07:56:00,198 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:56:00,198 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:56:00,199 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:56:00,199 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:56:00,199 INFO L82 PathProgramCache]: Analyzing trace with hash -414572547, now seen corresponding path program 24 times [2018-11-23 07:56:00,199 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:56:00,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:56:00,199 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:56:00,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:56:00,199 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:56:00,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:56:00,437 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-11-23 07:56:00,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:56:00,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:56:00,437 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:56:00,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:56:00,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:56:00,437 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 07:56:00,448 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-23 07:56:00,448 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-23 07:56:00,475 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-23 07:56:00,475 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-23 07:56:00,478 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:56:00,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-11-23 07:56:00,500 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:56:31,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 1452 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2018-11-23 07:56:31,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:56:31,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 53] total 54 [2018-11-23 07:56:31,538 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:56:31,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-23 07:56:31,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-23 07:56:31,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=755, Invalid=2107, Unknown=0, NotChecked=0, Total=2862 [2018-11-23 07:56:31,539 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 29 states. [2018-11-23 07:56:31,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:56:31,807 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2018-11-23 07:56:31,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-23 07:56:31,807 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 157 [2018-11-23 07:56:31,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:56:31,808 INFO L225 Difference]: With dead ends: 94 [2018-11-23 07:56:31,808 INFO L226 Difference]: Without dead ends: 90 [2018-11-23 07:56:31,809 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 263 SyntacticMatches, 51 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1776 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=2080, Invalid=4082, Unknown=0, NotChecked=0, Total=6162 [2018-11-23 07:56:31,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-11-23 07:56:31,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-11-23 07:56:31,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-11-23 07:56:31,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-11-23 07:56:31,811 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 157 [2018-11-23 07:56:31,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:56:31,811 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-11-23 07:56:31,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-23 07:56:31,812 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-11-23 07:56:31,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-11-23 07:56:31,812 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:56:31,812 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:56:31,812 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:56:31,813 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:56:31,813 INFO L82 PathProgramCache]: Analyzing trace with hash -975000849, now seen corresponding path program 25 times [2018-11-23 07:56:31,813 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:56:31,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:56:31,813 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-23 07:56:31,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:56:31,814 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:56:31,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:56:32,755 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-11-23 07:56:32,756 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:56:32,756 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-23 07:56:32,756 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-23 07:56:32,756 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-23 07:56:32,756 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-23 07:56:32,756 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-23 07:56:32,763 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:56:32,763 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-23 07:56:32,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:56:32,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-23 07:56:32,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-11-23 07:56:32,869 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-23 07:56:35,197 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-11-23 07:56:35,216 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-23 07:56:35,216 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 55 [2018-11-23 07:56:35,216 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-23 07:56:35,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-11-23 07:56:35,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-11-23 07:56:35,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=2863, Unknown=0, NotChecked=0, Total=2970 [2018-11-23 07:56:35,217 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 55 states. [2018-11-23 07:56:35,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:56:35,827 INFO L93 Difference]: Finished difference Result 97 states and 98 transitions. [2018-11-23 07:56:35,827 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-11-23 07:56:35,827 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 163 [2018-11-23 07:56:35,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:56:35,828 INFO L225 Difference]: With dead ends: 97 [2018-11-23 07:56:35,828 INFO L226 Difference]: Without dead ends: 93 [2018-11-23 07:56:35,828 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 323 SyntacticMatches, 4 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=107, Invalid=2863, Unknown=0, NotChecked=0, Total=2970 [2018-11-23 07:56:35,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-11-23 07:56:35,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2018-11-23 07:56:35,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-11-23 07:56:35,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2018-11-23 07:56:35,832 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 163 [2018-11-23 07:56:35,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:56:35,832 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2018-11-23 07:56:35,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-11-23 07:56:35,832 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2018-11-23 07:56:35,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-11-23 07:56:35,833 INFO L394 BasicCegarLoop]: Found error trace [2018-11-23 07:56:35,833 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-23 07:56:35,833 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-23 07:56:35,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-23 07:56:35,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1466565251, now seen corresponding path program 26 times [2018-11-23 07:56:35,834 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-23 07:56:35,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:56:35,834 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-23 07:56:35,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-23 07:56:35,834 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-23 07:56:35,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-23 07:56:36,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1027 proven. 0 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2018-11-23 07:56:36,109 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-23 07:56:36,109 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2018-11-23 07:56:36,109 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-23 07:56:36,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-23 07:56:36,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-23 07:56:36,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=520, Unknown=0, NotChecked=0, Total=930 [2018-11-23 07:56:36,110 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand 31 states. [2018-11-23 07:56:36,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-23 07:56:36,321 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-11-23 07:56:36,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-23 07:56:36,321 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 169 [2018-11-23 07:56:36,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-23 07:56:36,321 INFO L225 Difference]: With dead ends: 93 [2018-11-23 07:56:36,321 INFO L226 Difference]: Without dead ends: 0 [2018-11-23 07:56:36,322 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=1220, Invalid=2086, Unknown=0, NotChecked=0, Total=3306 [2018-11-23 07:56:36,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-23 07:56:36,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-23 07:56:36,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-23 07:56:36,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-23 07:56:36,322 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 169 [2018-11-23 07:56:36,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-23 07:56:36,322 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-23 07:56:36,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-23 07:56:36,322 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-23 07:56:36,322 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-23 07:56:36,325 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-23 07:56:36,354 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-23 07:56:36,354 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-23 07:56:36,354 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-23 07:56:36,354 INFO L451 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-23 07:56:36,354 INFO L451 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-23 07:56:36,354 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-23 07:56:36,354 INFO L451 ceAbstractionStarter]: At program point mainENTRY(lines 9 15) the Hoare annotation is: true [2018-11-23 07:56:36,354 INFO L448 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2018-11-23 07:56:36,354 INFO L448 ceAbstractionStarter]: For program point mainEXIT(lines 9 15) no Hoare annotation was computed. [2018-11-23 07:56:36,355 INFO L448 ceAbstractionStarter]: For program point L13(line 13) no Hoare annotation was computed. [2018-11-23 07:56:36,355 INFO L448 ceAbstractionStarter]: For program point L12(lines 12 14) no Hoare annotation was computed. [2018-11-23 07:56:36,355 INFO L444 ceAbstractionStarter]: At program point L11(line 11) the Hoare annotation is: (and (<= main_~input~0 25) (<= 25 main_~input~0)) [2018-11-23 07:56:36,355 INFO L448 ceAbstractionStarter]: For program point L11-1(line 11) no Hoare annotation was computed. [2018-11-23 07:56:36,355 INFO L448 ceAbstractionStarter]: For program point L12-2(lines 9 15) no Hoare annotation was computed. [2018-11-23 07:56:36,355 INFO L448 ceAbstractionStarter]: For program point idFINAL(lines 4 7) no Hoare annotation was computed. [2018-11-23 07:56:36,355 INFO L448 ceAbstractionStarter]: For program point idEXIT(lines 4 7) no Hoare annotation was computed. [2018-11-23 07:56:36,355 INFO L451 ceAbstractionStarter]: At program point idENTRY(lines 4 7) the Hoare annotation is: true [2018-11-23 07:56:36,355 INFO L444 ceAbstractionStarter]: At program point L6(line 6) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2018-11-23 07:56:36,355 INFO L448 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-11-23 07:56:36,355 INFO L448 ceAbstractionStarter]: For program point L6-1(line 6) no Hoare annotation was computed. [2018-11-23 07:56:36,357 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 07:56:36 BoogieIcfgContainer [2018-11-23 07:56:36,357 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-23 07:56:36,358 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-23 07:56:36,358 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-23 07:56:36,358 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-23 07:56:36,358 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 07:53:00" (3/4) ... [2018-11-23 07:56:36,361 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-23 07:56:36,365 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-23 07:56:36,366 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-23 07:56:36,366 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id [2018-11-23 07:56:36,368 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-11-23 07:56:36,368 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-11-23 07:56:36,368 INFO L879 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-23 07:56:36,394 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_43dfad6f-72d0-4dd3-b040-3634e4c29401/bin-2019/utaipan/witness.graphml [2018-11-23 07:56:36,394 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-23 07:56:36,394 INFO L168 Benchmark]: Toolchain (without parser) took 216058.19 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 163.6 MB). Free memory was 959.2 MB in the beginning and 875.4 MB in the end (delta: 83.8 MB). Peak memory consumption was 247.4 MB. Max. memory is 11.5 GB. [2018-11-23 07:56:36,396 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 1.0 GB. Free memory is still 985.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 07:56:36,396 INFO L168 Benchmark]: CACSL2BoogieTranslator took 146.96 ms. Allocated memory is still 1.0 GB. Free memory was 959.2 MB in the beginning and 948.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-23 07:56:36,396 INFO L168 Benchmark]: Boogie Procedure Inliner took 12.22 ms. Allocated memory is still 1.0 GB. Free memory is still 948.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-23 07:56:36,398 INFO L168 Benchmark]: Boogie Preprocessor took 10.87 ms. Allocated memory is still 1.0 GB. Free memory was 948.5 MB in the beginning and 945.8 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-23 07:56:36,398 INFO L168 Benchmark]: RCFGBuilder took 187.82 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.8 MB). Free memory was 945.8 MB in the beginning and 1.1 GB in the end (delta: -172.9 MB). Peak memory consumption was 14.2 MB. Max. memory is 11.5 GB. [2018-11-23 07:56:36,398 INFO L168 Benchmark]: TraceAbstraction took 215661.17 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 27.8 MB). Free memory was 1.1 GB in the beginning and 882.8 MB in the end (delta: 235.9 MB). Peak memory consumption was 263.7 MB. Max. memory is 11.5 GB. [2018-11-23 07:56:36,398 INFO L168 Benchmark]: Witness Printer took 36.18 ms. Allocated memory is still 1.2 GB. Free memory was 882.8 MB in the beginning and 875.4 MB in the end (delta: 7.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 11.5 GB. [2018-11-23 07:56:36,401 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 1.0 GB. Free memory is still 985.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 146.96 ms. Allocated memory is still 1.0 GB. Free memory was 959.2 MB in the beginning and 948.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 12.22 ms. Allocated memory is still 1.0 GB. Free memory is still 948.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.87 ms. Allocated memory is still 1.0 GB. Free memory was 948.5 MB in the beginning and 945.8 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 187.82 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.8 MB). Free memory was 945.8 MB in the beginning and 1.1 GB in the end (delta: -172.9 MB). Peak memory consumption was 14.2 MB. Max. memory is 11.5 GB. * TraceAbstraction took 215661.17 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 27.8 MB). Free memory was 1.1 GB in the beginning and 882.8 MB in the end (delta: 235.9 MB). Peak memory consumption was 263.7 MB. Max. memory is 11.5 GB. * Witness Printer took 36.18 ms. Allocated memory is still 1.2 GB. Free memory was 882.8 MB in the beginning and 875.4 MB in the end (delta: 7.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. SAFE Result, 215.6s OverallTime, 27 OverallIterations, 27 TraceHistogramMax, 4.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 455 SDtfs, 782 SDslu, 5882 SDs, 0 SdLazy, 3946 SolverSat, 34 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5714 GetRequests, 3905 SyntacticMatches, 653 SemanticMatches, 1156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16499 ImplicationChecksByTransitivity, 12.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=93occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 27 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 19 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 209.5s InterpolantComputationTime, 4732 NumberOfCodeBlocks, 4732 NumberOfCodeBlocksAsserted, 160 NumberOfCheckSat, 6930 ConstructedInterpolants, 0 QuantifiedInterpolants, 2364216 SizeOfPredicates, 349 NumberOfNonLiveVariables, 5325 ConjunctsInSsa, 803 ConjunctsInUnsatCore, 77 InterpolantComputations, 2 PerfectInterpolantSequences, 22504/52754 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...