./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i -s /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/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 561472dda653ab23fa8eff641224e01683fc61ba ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-635dfa2 [2018-12-09 01:21:15,186 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-09 01:21:15,187 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-09 01:21:15,193 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-09 01:21:15,193 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-09 01:21:15,194 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-09 01:21:15,195 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-09 01:21:15,196 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-09 01:21:15,197 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-09 01:21:15,197 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-09 01:21:15,198 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-09 01:21:15,198 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-09 01:21:15,198 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-09 01:21:15,199 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-09 01:21:15,199 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-09 01:21:15,200 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-09 01:21:15,200 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-09 01:21:15,201 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-09 01:21:15,202 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-09 01:21:15,203 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-09 01:21:15,204 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-09 01:21:15,204 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-09 01:21:15,206 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-09 01:21:15,206 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-09 01:21:15,206 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-09 01:21:15,207 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-09 01:21:15,207 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-09 01:21:15,208 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-09 01:21:15,208 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-09 01:21:15,209 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-09 01:21:15,209 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-09 01:21:15,209 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-09 01:21:15,209 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-09 01:21:15,209 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-09 01:21:15,210 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-09 01:21:15,210 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-09 01:21:15,211 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-09 01:21:15,218 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-09 01:21:15,218 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-09 01:21:15,218 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-09 01:21:15,219 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-09 01:21:15,219 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-09 01:21:15,219 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-09 01:21:15,219 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-09 01:21:15,219 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-09 01:21:15,219 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-09 01:21:15,219 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-09 01:21:15,219 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-09 01:21:15,220 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-09 01:21:15,220 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-09 01:21:15,220 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-09 01:21:15,220 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-09 01:21:15,220 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-09 01:21:15,221 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-09 01:21:15,221 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-09 01:21:15,221 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-09 01:21:15,221 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-09 01:21:15,221 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-09 01:21:15,221 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-09 01:21:15,221 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-09 01:21:15,221 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-09 01:21:15,222 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-09 01:21:15,222 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-09 01:21:15,222 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-09 01:21:15,222 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-09 01:21:15,222 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-09 01:21:15,222 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-09 01:21:15,222 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-09 01:21:15,222 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-09 01:21:15,222 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-09 01:21:15,223 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-09 01:21:15,223 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-09 01:21:15,223 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-09 01:21:15,223 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_517fc9ea-c29b-4200-821c-2d619d49feb6/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 -> 561472dda653ab23fa8eff641224e01683fc61ba [2018-12-09 01:21:15,240 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-09 01:21:15,247 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-09 01:21:15,249 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-09 01:21:15,250 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-09 01:21:15,250 INFO L276 PluginConnector]: CDTParser initialized [2018-12-09 01:21:15,250 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/../../sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i [2018-12-09 01:21:15,285 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/data/c1abcb5b6/767080f94b084f419e16c95f30c9e781/FLAG3de337738 [2018-12-09 01:21:15,699 INFO L307 CDTParser]: Found 1 translation units. [2018-12-09 01:21:15,699 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/sv-benchmarks/c/loops/invert_string_false-unreach-call_true-termination.i [2018-12-09 01:21:15,702 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/data/c1abcb5b6/767080f94b084f419e16c95f30c9e781/FLAG3de337738 [2018-12-09 01:21:15,713 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/data/c1abcb5b6/767080f94b084f419e16c95f30c9e781 [2018-12-09 01:21:15,715 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-09 01:21:15,716 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-09 01:21:15,716 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-09 01:21:15,717 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-09 01:21:15,719 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-09 01:21:15,719 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 01:21:15" (1/1) ... [2018-12-09 01:21:15,721 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56acabfb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15, skipping insertion in model container [2018-12-09 01:21:15,721 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 01:21:15" (1/1) ... [2018-12-09 01:21:15,726 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-09 01:21:15,736 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-09 01:21:15,827 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 01:21:15,830 INFO L191 MainTranslator]: Completed pre-run [2018-12-09 01:21:15,842 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 01:21:15,853 INFO L195 MainTranslator]: Completed translation [2018-12-09 01:21:15,853 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15 WrapperNode [2018-12-09 01:21:15,854 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-09 01:21:15,854 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-09 01:21:15,854 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-09 01:21:15,854 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-09 01:21:15,859 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15" (1/1) ... [2018-12-09 01:21:15,864 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15" (1/1) ... [2018-12-09 01:21:15,868 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-09 01:21:15,868 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-09 01:21:15,868 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-09 01:21:15,868 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-09 01:21:15,874 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15" (1/1) ... [2018-12-09 01:21:15,874 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15" (1/1) ... [2018-12-09 01:21:15,875 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15" (1/1) ... [2018-12-09 01:21:15,875 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15" (1/1) ... [2018-12-09 01:21:15,909 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15" (1/1) ... [2018-12-09 01:21:15,913 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15" (1/1) ... [2018-12-09 01:21:15,914 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15" (1/1) ... [2018-12-09 01:21:15,915 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-09 01:21:15,915 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-09 01:21:15,915 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-09 01:21:15,915 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-09 01:21:15,916 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-09 01:21:15,947 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-12-09 01:21:15,947 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-09 01:21:15,947 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-09 01:21:15,947 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-12-09 01:21:15,947 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-09 01:21:15,948 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-09 01:21:15,948 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-12-09 01:21:15,948 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-09 01:21:15,948 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-09 01:21:15,948 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-12-09 01:21:15,948 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-12-09 01:21:15,948 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-12-09 01:21:16,062 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-09 01:21:16,062 INFO L280 CfgBuilder]: Removed 3 assue(true) statements. [2018-12-09 01:21:16,063 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 01:21:16 BoogieIcfgContainer [2018-12-09 01:21:16,063 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-09 01:21:16,063 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-09 01:21:16,064 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-09 01:21:16,066 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-09 01:21:16,067 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 01:21:15" (1/3) ... [2018-12-09 01:21:16,067 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28af6fa1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 01:21:16, skipping insertion in model container [2018-12-09 01:21:16,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 01:21:15" (2/3) ... [2018-12-09 01:21:16,068 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28af6fa1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 01:21:16, skipping insertion in model container [2018-12-09 01:21:16,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 01:21:16" (3/3) ... [2018-12-09 01:21:16,069 INFO L112 eAbstractionObserver]: Analyzing ICFG invert_string_false-unreach-call_true-termination.i [2018-12-09 01:21:16,078 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-09 01:21:16,083 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-09 01:21:16,097 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-09 01:21:16,122 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-09 01:21:16,122 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-09 01:21:16,122 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-09 01:21:16,122 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-09 01:21:16,122 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-09 01:21:16,122 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-09 01:21:16,122 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-09 01:21:16,122 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-09 01:21:16,133 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2018-12-09 01:21:16,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-09 01:21:16,136 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 01:21:16,136 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 01:21:16,138 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 01:21:16,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:16,141 INFO L82 PathProgramCache]: Analyzing trace with hash 1778002988, now seen corresponding path program 1 times [2018-12-09 01:21:16,143 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 01:21:16,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:16,179 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 01:21:16,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:16,179 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 01:21:16,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:16,233 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:21:16,234 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 01:21:16,234 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-09 01:21:16,234 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 01:21:16,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-12-09 01:21:16,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-12-09 01:21:16,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-12-09 01:21:16,246 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2018-12-09 01:21:16,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 01:21:16,258 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2018-12-09 01:21:16,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-12-09 01:21:16,259 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-12-09 01:21:16,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 01:21:16,263 INFO L225 Difference]: With dead ends: 46 [2018-12-09 01:21:16,264 INFO L226 Difference]: Without dead ends: 22 [2018-12-09 01:21:16,265 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-12-09 01:21:16,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-09 01:21:16,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-12-09 01:21:16,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-12-09 01:21:16,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2018-12-09 01:21:16,286 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2018-12-09 01:21:16,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 01:21:16,286 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2018-12-09 01:21:16,286 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-12-09 01:21:16,287 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2018-12-09 01:21:16,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-09 01:21:16,287 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 01:21:16,287 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 01:21:16,287 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 01:21:16,287 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:16,287 INFO L82 PathProgramCache]: Analyzing trace with hash -262172122, now seen corresponding path program 1 times [2018-12-09 01:21:16,288 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 01:21:16,288 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:16,289 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 01:21:16,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:16,289 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 01:21:16,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:16,336 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:21:16,336 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 01:21:16,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-09 01:21:16,337 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 01:21:16,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-09 01:21:16,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-09 01:21:16,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-09 01:21:16,338 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 4 states. [2018-12-09 01:21:16,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 01:21:16,372 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-12-09 01:21:16,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-09 01:21:16,372 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2018-12-09 01:21:16,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 01:21:16,373 INFO L225 Difference]: With dead ends: 34 [2018-12-09 01:21:16,373 INFO L226 Difference]: Without dead ends: 23 [2018-12-09 01:21:16,374 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-09 01:21:16,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-09 01:21:16,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-12-09 01:21:16,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-12-09 01:21:16,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2018-12-09 01:21:16,377 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 15 [2018-12-09 01:21:16,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 01:21:16,377 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2018-12-09 01:21:16,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-09 01:21:16,377 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2018-12-09 01:21:16,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-09 01:21:16,378 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 01:21:16,378 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 01:21:16,378 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 01:21:16,378 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:16,378 INFO L82 PathProgramCache]: Analyzing trace with hash 1485613060, now seen corresponding path program 1 times [2018-12-09 01:21:16,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 01:21:16,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:16,379 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 01:21:16,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:16,379 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 01:21:16,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:16,405 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-09 01:21:16,405 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 01:21:16,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-09 01:21:16,405 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 01:21:16,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-09 01:21:16,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-09 01:21:16,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-09 01:21:16,406 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 3 states. [2018-12-09 01:21:16,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 01:21:16,424 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2018-12-09 01:21:16,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-09 01:21:16,424 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-12-09 01:21:16,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 01:21:16,424 INFO L225 Difference]: With dead ends: 40 [2018-12-09 01:21:16,424 INFO L226 Difference]: Without dead ends: 25 [2018-12-09 01:21:16,425 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-09 01:21:16,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-09 01:21:16,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-12-09 01:21:16,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-09 01:21:16,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2018-12-09 01:21:16,427 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2018-12-09 01:21:16,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 01:21:16,427 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2018-12-09 01:21:16,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-09 01:21:16,428 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2018-12-09 01:21:16,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-09 01:21:16,428 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 01:21:16,428 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 01:21:16,428 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 01:21:16,428 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:16,428 INFO L82 PathProgramCache]: Analyzing trace with hash 1323409058, now seen corresponding path program 1 times [2018-12-09 01:21:16,428 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 01:21:16,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:16,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 01:21:16,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:16,429 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 01:21:16,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:16,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:21:16,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:16,615 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 01:21:16,615 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-12-09 01:21:16,616 INFO L205 CegarAbsIntRunner]: [0], [1], [5], [11], [13], [15], [19], [25], [27], [29], [33], [41], [51], [54], [56], [62], [63], [64], [66] [2018-12-09 01:21:16,636 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-09 01:21:16,636 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-09 01:21:16,763 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-09 01:21:16,764 INFO L272 AbstractInterpreter]: Visited 19 different actions 42 times. Merged at 6 different actions 17 times. Widened at 2 different actions 2 times. Performed 260 root evaluator evaluations with a maximum evaluation depth of 6. Performed 260 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 8 fixpoints after 4 different actions. Largest state had 26 variables. [2018-12-09 01:21:16,773 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:16,774 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-09 01:21:16,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:16,774 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 01:21:16,780 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 01:21:16,780 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 01:21:16,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:16,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 01:21:16,838 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 1 [2018-12-09 01:21:16,839 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:16,843 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:16,843 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2018-12-09 01:21:16,905 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 17 [2018-12-09 01:21:16,907 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-12-09 01:21:16,907 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:16,910 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:16,924 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:16,924 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:25 [2018-12-09 01:21:16,968 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2018-12-09 01:21:16,971 INFO L683 Elim1Store]: detected equality via solver [2018-12-09 01:21:16,971 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-12-09 01:21:16,972 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:16,980 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-12-09 01:21:16,980 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:16,982 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:16,986 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:16,986 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:40, output treesize:3 [2018-12-09 01:21:17,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:21:17,011 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 01:21:17,055 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2018-12-09 01:21:17,077 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2018-12-09 01:21:17,078 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,087 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 14 [2018-12-09 01:21:17,088 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,100 INFO L267 ElimStorePlain]: Start of recursive call 2: 3 dim-1 vars, End of recursive call: and 2 xjuncts. [2018-12-09 01:21:17,106 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 2 xjuncts. [2018-12-09 01:21:17,107 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2018-12-09 01:21:17,177 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:21:17,191 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 01:21:17,192 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 25 [2018-12-09 01:21:17,192 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 01:21:17,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-09 01:21:17,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-09 01:21:17,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2018-12-09 01:21:17,193 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 19 states. [2018-12-09 01:21:17,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 01:21:17,512 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-12-09 01:21:17,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-09 01:21:17,512 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 19 [2018-12-09 01:21:17,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 01:21:17,513 INFO L225 Difference]: With dead ends: 46 [2018-12-09 01:21:17,514 INFO L226 Difference]: Without dead ends: 44 [2018-12-09 01:21:17,514 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=220, Invalid=836, Unknown=0, NotChecked=0, Total=1056 [2018-12-09 01:21:17,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-12-09 01:21:17,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2018-12-09 01:21:17,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-09 01:21:17,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2018-12-09 01:21:17,520 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 19 [2018-12-09 01:21:17,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 01:21:17,520 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2018-12-09 01:21:17,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-09 01:21:17,520 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2018-12-09 01:21:17,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-09 01:21:17,520 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 01:21:17,521 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 01:21:17,521 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 01:21:17,521 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:17,521 INFO L82 PathProgramCache]: Analyzing trace with hash 64185792, now seen corresponding path program 2 times [2018-12-09 01:21:17,521 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 01:21:17,521 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:17,522 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 01:21:17,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:17,522 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 01:21:17,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:17,554 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:21:17,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:17,554 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 01:21:17,554 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 01:21:17,555 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 01:21:17,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:17,555 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 01:21:17,560 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 01:21:17,560 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 01:21:17,571 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-09 01:21:17,571 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 01:21:17,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 01:21:17,581 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 1 [2018-12-09 01:21:17,581 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,585 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,585 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2018-12-09 01:21:17,608 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 17 [2018-12-09 01:21:17,610 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2018-12-09 01:21:17,610 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,616 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,622 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,622 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:31, output treesize:27 [2018-12-09 01:21:17,668 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2018-12-09 01:21:17,670 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 5 [2018-12-09 01:21:17,670 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,675 INFO L683 Elim1Store]: detected equality via solver [2018-12-09 01:21:17,676 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2018-12-09 01:21:17,676 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,678 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,682 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,682 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:40, output treesize:3 [2018-12-09 01:21:17,700 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-09 01:21:17,700 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 01:21:17,766 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2018-12-09 01:21:17,786 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2018-12-09 01:21:17,786 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,794 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 14 [2018-12-09 01:21:17,795 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:17,805 INFO L267 ElimStorePlain]: Start of recursive call 2: 3 dim-1 vars, End of recursive call: and 2 xjuncts. [2018-12-09 01:21:17,812 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 2 xjuncts. [2018-12-09 01:21:17,812 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:41, output treesize:22 [2018-12-09 01:21:17,840 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-09 01:21:17,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 01:21:17,854 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 11] total 23 [2018-12-09 01:21:17,854 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 01:21:17,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-09 01:21:17,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-09 01:21:17,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=426, Unknown=0, NotChecked=0, Total=506 [2018-12-09 01:21:17,855 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 15 states. [2018-12-09 01:21:18,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 01:21:18,300 INFO L93 Difference]: Finished difference Result 71 states and 78 transitions. [2018-12-09 01:21:18,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-09 01:21:18,300 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 21 [2018-12-09 01:21:18,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 01:21:18,300 INFO L225 Difference]: With dead ends: 71 [2018-12-09 01:21:18,300 INFO L226 Difference]: Without dead ends: 50 [2018-12-09 01:21:18,301 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=294, Invalid=1266, Unknown=0, NotChecked=0, Total=1560 [2018-12-09 01:21:18,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-12-09 01:21:18,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 41. [2018-12-09 01:21:18,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-12-09 01:21:18,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2018-12-09 01:21:18,305 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 21 [2018-12-09 01:21:18,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 01:21:18,305 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2018-12-09 01:21:18,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-09 01:21:18,305 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2018-12-09 01:21:18,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-09 01:21:18,306 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 01:21:18,306 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 01:21:18,306 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 01:21:18,306 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:18,306 INFO L82 PathProgramCache]: Analyzing trace with hash 1582955806, now seen corresponding path program 3 times [2018-12-09 01:21:18,306 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 01:21:18,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:18,307 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 01:21:18,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:18,307 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 01:21:18,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:18,551 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-09 01:21:18,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:18,551 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 01:21:18,552 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 01:21:18,552 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 01:21:18,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:18,552 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 01:21:18,557 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-09 01:21:18,558 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-09 01:21:18,565 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-09 01:21:18,565 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 01:21:18,567 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 01:21:18,590 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 15 treesize of output 28 [2018-12-09 01:21:18,593 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 16 [2018-12-09 01:21:18,593 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,600 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,603 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,603 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:24, output treesize:20 [2018-12-09 01:21:18,638 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 37 [2018-12-09 01:21:18,641 INFO L701 Elim1Store]: detected not equals via solver [2018-12-09 01:21:18,641 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2018-12-09 01:21:18,641 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,655 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,659 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,659 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:37, output treesize:33 [2018-12-09 01:21:18,751 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 37 [2018-12-09 01:21:18,754 INFO L701 Elim1Store]: detected not equals via solver [2018-12-09 01:21:18,755 INFO L683 Elim1Store]: detected equality via solver [2018-12-09 01:21:18,756 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 28 [2018-12-09 01:21:18,756 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,766 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 8 [2018-12-09 01:21:18,766 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,776 INFO L701 Elim1Store]: detected not equals via solver [2018-12-09 01:21:18,777 INFO L683 Elim1Store]: detected equality via solver [2018-12-09 01:21:18,777 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2018-12-09 01:21:18,778 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,783 INFO L267 ElimStorePlain]: Start of recursive call 2: 3 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,786 INFO L267 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,786 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 6 variables, input treesize:47, output treesize:3 [2018-12-09 01:21:18,809 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-09 01:21:18,809 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 01:21:18,962 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 34 [2018-12-09 01:21:18,964 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 29 [2018-12-09 01:21:18,974 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2018-12-09 01:21:18,975 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,979 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:18,989 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 32 [2018-12-09 01:21:19,003 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 14 [2018-12-09 01:21:19,004 INFO L267 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:19,008 INFO L267 ElimStorePlain]: Start of recursive call 5: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:19,023 INFO L267 ElimStorePlain]: Start of recursive call 2: 3 dim-1 vars, End of recursive call: and 2 xjuncts. [2018-12-09 01:21:19,033 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-12-09 01:21:19,033 INFO L202 ElimStorePlain]: Needed 6 recursive calls to eliminate 5 variables, input treesize:92, output treesize:20 [2018-12-09 01:21:19,055 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-09 01:21:19,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 01:21:19,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 29 [2018-12-09 01:21:19,070 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 01:21:19,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-09 01:21:19,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-09 01:21:19,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=704, Unknown=0, NotChecked=0, Total=812 [2018-12-09 01:21:19,071 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 22 states. [2018-12-09 01:21:19,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 01:21:19,482 INFO L93 Difference]: Finished difference Result 69 states and 76 transitions. [2018-12-09 01:21:19,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-09 01:21:19,482 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 23 [2018-12-09 01:21:19,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 01:21:19,484 INFO L225 Difference]: With dead ends: 69 [2018-12-09 01:21:19,484 INFO L226 Difference]: Without dead ends: 67 [2018-12-09 01:21:19,485 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=247, Invalid=1235, Unknown=0, NotChecked=0, Total=1482 [2018-12-09 01:21:19,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-09 01:21:19,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 43. [2018-12-09 01:21:19,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-09 01:21:19,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2018-12-09 01:21:19,490 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 23 [2018-12-09 01:21:19,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 01:21:19,490 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2018-12-09 01:21:19,490 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-09 01:21:19,490 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2018-12-09 01:21:19,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-12-09 01:21:19,491 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 01:21:19,491 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 01:21:19,491 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 01:21:19,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:19,491 INFO L82 PathProgramCache]: Analyzing trace with hash 832058620, now seen corresponding path program 4 times [2018-12-09 01:21:19,491 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 01:21:19,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:19,492 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 01:21:19,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:19,492 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 01:21:19,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:19,533 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:21:19,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:19,534 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 01:21:19,534 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 01:21:19,534 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 01:21:19,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:19,534 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 01:21:19,540 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 01:21:19,540 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 01:21:19,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:19,553 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 01:21:19,557 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:21:19,557 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 01:21:19,590 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:21:19,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 01:21:19,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 8 [2018-12-09 01:21:19,605 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 01:21:19,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-09 01:21:19,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-09 01:21:19,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-12-09 01:21:19,606 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand 8 states. [2018-12-09 01:21:19,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 01:21:19,672 INFO L93 Difference]: Finished difference Result 96 states and 110 transitions. [2018-12-09 01:21:19,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-09 01:21:19,673 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-12-09 01:21:19,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 01:21:19,673 INFO L225 Difference]: With dead ends: 96 [2018-12-09 01:21:19,673 INFO L226 Difference]: Without dead ends: 74 [2018-12-09 01:21:19,674 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 45 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2018-12-09 01:21:19,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-12-09 01:21:19,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 45. [2018-12-09 01:21:19,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-09 01:21:19,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2018-12-09 01:21:19,682 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 25 [2018-12-09 01:21:19,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 01:21:19,682 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2018-12-09 01:21:19,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-09 01:21:19,682 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2018-12-09 01:21:19,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-09 01:21:19,683 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 01:21:19,683 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 01:21:19,683 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 01:21:19,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:19,683 INFO L82 PathProgramCache]: Analyzing trace with hash -657216102, now seen corresponding path program 5 times [2018-12-09 01:21:19,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 01:21:19,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:19,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 01:21:19,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:19,684 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 01:21:19,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:20,002 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 01:21:20,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:20,002 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 01:21:20,002 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-09 01:21:20,003 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-09 01:21:20,003 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:20,003 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 01:21:20,008 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-09 01:21:20,009 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-09 01:21:20,021 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-09 01:21:20,021 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-09 01:21:20,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 01:21:20,029 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 1 [2018-12-09 01:21:20,030 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:20,033 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:20,033 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2018-12-09 01:21:20,128 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2018-12-09 01:21:20,130 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-12-09 01:21:20,130 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:20,132 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:20,137 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:20,137 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:36, output treesize:29 [2018-12-09 01:21:20,221 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2018-12-09 01:21:20,223 INFO L683 Elim1Store]: detected equality via solver [2018-12-09 01:21:20,223 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2018-12-09 01:21:20,223 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:20,228 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2018-12-09 01:21:20,229 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:20,230 INFO L267 ElimStorePlain]: Start of recursive call 2: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:20,234 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-12-09 01:21:20,234 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:40, output treesize:3 [2018-12-09 01:21:20,263 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-12-09 01:21:20,263 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 01:21:20,375 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2018-12-09 01:21:20,396 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2018-12-09 01:21:20,396 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:20,409 INFO L478 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2018-12-09 01:21:20,410 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-12-09 01:21:20,415 INFO L267 ElimStorePlain]: Start of recursive call 2: 3 dim-1 vars, End of recursive call: and 2 xjuncts. [2018-12-09 01:21:20,423 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 2 xjuncts. [2018-12-09 01:21:20,423 INFO L202 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:45, output treesize:28 [2018-12-09 01:21:20,512 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-12-09 01:21:20,527 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 01:21:20,527 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 14] total 38 [2018-12-09 01:21:20,527 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 01:21:20,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-09 01:21:20,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-09 01:21:20,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1229, Unknown=0, NotChecked=0, Total=1406 [2018-12-09 01:21:20,528 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand 29 states. [2018-12-09 01:21:21,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 01:21:21,543 INFO L93 Difference]: Finished difference Result 103 states and 119 transitions. [2018-12-09 01:21:21,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-09 01:21:21,543 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 27 [2018-12-09 01:21:21,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 01:21:21,544 INFO L225 Difference]: With dead ends: 103 [2018-12-09 01:21:21,544 INFO L226 Difference]: Without dead ends: 101 [2018-12-09 01:21:21,545 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 948 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=675, Invalid=3357, Unknown=0, NotChecked=0, Total=4032 [2018-12-09 01:21:21,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-12-09 01:21:21,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 55. [2018-12-09 01:21:21,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-09 01:21:21,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2018-12-09 01:21:21,551 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 27 [2018-12-09 01:21:21,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 01:21:21,551 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2018-12-09 01:21:21,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-09 01:21:21,551 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2018-12-09 01:21:21,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-09 01:21:21,551 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 01:21:21,551 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 01:21:21,552 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 01:21:21,552 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:21,552 INFO L82 PathProgramCache]: Analyzing trace with hash -836061513, now seen corresponding path program 1 times [2018-12-09 01:21:21,552 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 01:21:21,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:21,552 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-09 01:21:21,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:21,552 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 01:21:21,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:21,580 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-09 01:21:21,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:21,581 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-09 01:21:21,581 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 30 with the following transitions: [2018-12-09 01:21:21,581 INFO L205 CegarAbsIntRunner]: [0], [1], [5], [11], [13], [15], [19], [25], [27], [29], [33], [41], [43], [45], [51], [54], [56], [59], [61], [62], [63], [64], [66], [67] [2018-12-09 01:21:21,582 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-12-09 01:21:21,582 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-09 01:21:21,632 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-09 01:21:21,632 INFO L272 AbstractInterpreter]: Visited 24 different actions 63 times. Merged at 10 different actions 22 times. Widened at 1 different actions 1 times. Performed 324 root evaluator evaluations with a maximum evaluation depth of 6. Performed 324 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 8 fixpoints after 5 different actions. Largest state had 28 variables. [2018-12-09 01:21:21,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:21,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-09 01:21:21,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-09 01:21:21,640 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-09 01:21:21,648 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 01:21:21,648 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-09 01:21:21,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 01:21:21,659 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-09 01:21:21,661 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-09 01:21:21,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-09 01:21:21,682 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-09 01:21:21,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-09 01:21:21,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 7 [2018-12-09 01:21:21,707 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-09 01:21:21,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-09 01:21:21,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-09 01:21:21,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2018-12-09 01:21:21,707 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand 7 states. [2018-12-09 01:21:21,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 01:21:21,753 INFO L93 Difference]: Finished difference Result 86 states and 96 transitions. [2018-12-09 01:21:21,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-09 01:21:21,754 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 29 [2018-12-09 01:21:21,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 01:21:21,754 INFO L225 Difference]: With dead ends: 86 [2018-12-09 01:21:21,754 INFO L226 Difference]: Without dead ends: 63 [2018-12-09 01:21:21,755 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 54 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-12-09 01:21:21,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-12-09 01:21:21,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2018-12-09 01:21:21,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-09 01:21:21,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2018-12-09 01:21:21,761 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 29 [2018-12-09 01:21:21,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 01:21:21,761 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2018-12-09 01:21:21,761 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-09 01:21:21,761 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2018-12-09 01:21:21,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-12-09 01:21:21,761 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 01:21:21,761 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 01:21:21,762 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 01:21:21,762 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 01:21:21,762 INFO L82 PathProgramCache]: Analyzing trace with hash 60600405, now seen corresponding path program 2 times [2018-12-09 01:21:21,762 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 01:21:21,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:21,762 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 01:21:21,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 01:21:21,762 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 01:21:21,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-09 01:21:21,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-09 01:21:21,790 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2018-12-09 01:21:21,812 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 01:21:21 BoogieIcfgContainer [2018-12-09 01:21:21,812 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-09 01:21:21,812 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-09 01:21:21,812 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-09 01:21:21,812 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-09 01:21:21,813 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 01:21:16" (3/4) ... [2018-12-09 01:21:21,814 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-12-09 01:21:21,846 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_517fc9ea-c29b-4200-821c-2d619d49feb6/bin-2019/utaipan/witness.graphml [2018-12-09 01:21:21,846 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-09 01:21:21,846 INFO L168 Benchmark]: Toolchain (without parser) took 6130.93 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 182.5 MB). Free memory was 957.7 MB in the beginning and 850.1 MB in the end (delta: 107.7 MB). Peak memory consumption was 290.1 MB. Max. memory is 11.5 GB. [2018-12-09 01:21:21,847 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 01:21:21,847 INFO L168 Benchmark]: CACSL2BoogieTranslator took 137.29 ms. Allocated memory is still 1.0 GB. Free memory was 957.7 MB in the beginning and 947.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-12-09 01:21:21,848 INFO L168 Benchmark]: Boogie Procedure Inliner took 13.91 ms. Allocated memory is still 1.0 GB. Free memory is still 947.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 01:21:21,848 INFO L168 Benchmark]: Boogie Preprocessor took 46.84 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 118.5 MB). Free memory was 947.0 MB in the beginning and 1.1 GB in the end (delta: -166.7 MB). Peak memory consumption was 18.5 MB. Max. memory is 11.5 GB. [2018-12-09 01:21:21,848 INFO L168 Benchmark]: RCFGBuilder took 147.74 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 14.3 MB). Peak memory consumption was 14.3 MB. Max. memory is 11.5 GB. [2018-12-09 01:21:21,848 INFO L168 Benchmark]: TraceAbstraction took 5748.33 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 64.0 MB). Free memory was 1.1 GB in the beginning and 857.0 MB in the end (delta: 242.4 MB). Peak memory consumption was 306.3 MB. Max. memory is 11.5 GB. [2018-12-09 01:21:21,848 INFO L168 Benchmark]: Witness Printer took 33.76 ms. Allocated memory is still 1.2 GB. Free memory was 857.0 MB in the beginning and 850.1 MB in the end (delta: 7.0 MB). Peak memory consumption was 7.0 MB. Max. memory is 11.5 GB. [2018-12-09 01:21:21,850 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 137.29 ms. Allocated memory is still 1.0 GB. Free memory was 957.7 MB in the beginning and 947.0 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 13.91 ms. Allocated memory is still 1.0 GB. Free memory is still 947.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 46.84 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 118.5 MB). Free memory was 947.0 MB in the beginning and 1.1 GB in the end (delta: -166.7 MB). Peak memory consumption was 18.5 MB. Max. memory is 11.5 GB. * RCFGBuilder took 147.74 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 14.3 MB). Peak memory consumption was 14.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 5748.33 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 64.0 MB). Free memory was 1.1 GB in the beginning and 857.0 MB in the end (delta: 242.4 MB). Peak memory consumption was 306.3 MB. Max. memory is 11.5 GB. * Witness Printer took 33.76 ms. Allocated memory is still 1.2 GB. Free memory was 857.0 MB in the beginning and 850.1 MB in the end (delta: 7.0 MB). Peak memory consumption was 7.0 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 VAL [cont=0, i=0, MAX=2, str1={4:0}, str2={5:0}] [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={4:0}, str2={5:0}] [L27] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={5:0}] [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={4:0}, str2={5:0}] [L27] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={4:0}, str2={5:0}] [L27] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={4:0}, str2={5:0}] [L32] j = MAX-1 [L33] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={5:0}] [L33] COND TRUE i