./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/reducercommutativity/max.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f470102c Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/reducercommutativity/max.i -s /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/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 c721a987debd4748cfed075333b7fa46c2d0f9ef ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/reducercommutativity/max.i -s /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/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 c721a987debd4748cfed075333b7fa46c2d0f9ef .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: UNKNOWN --- Real Ultimate output --- This is Ultimate 0.1.25-f470102 [2019-12-07 21:18:46,757 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 21:18:46,758 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 21:18:46,766 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 21:18:46,766 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 21:18:46,766 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 21:18:46,767 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 21:18:46,769 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 21:18:46,770 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 21:18:46,771 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 21:18:46,771 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 21:18:46,772 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 21:18:46,772 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 21:18:46,773 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 21:18:46,773 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 21:18:46,774 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 21:18:46,775 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 21:18:46,775 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 21:18:46,777 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 21:18:46,778 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 21:18:46,779 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 21:18:46,780 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 21:18:46,780 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 21:18:46,781 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 21:18:46,782 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 21:18:46,783 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 21:18:46,783 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 21:18:46,783 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 21:18:46,783 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 21:18:46,784 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 21:18:46,784 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 21:18:46,785 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 21:18:46,785 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 21:18:46,785 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 21:18:46,786 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 21:18:46,786 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 21:18:46,786 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 21:18:46,787 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 21:18:46,787 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 21:18:46,787 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 21:18:46,788 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 21:18:46,788 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2019-12-07 21:18:46,798 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 21:18:46,798 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 21:18:46,799 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-12-07 21:18:46,799 INFO L138 SettingsManager]: * User list type=DISABLED [2019-12-07 21:18:46,799 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-12-07 21:18:46,799 INFO L138 SettingsManager]: * Explicit value domain=true [2019-12-07 21:18:46,799 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-12-07 21:18:46,799 INFO L138 SettingsManager]: * Octagon Domain=false [2019-12-07 21:18:46,800 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-12-07 21:18:46,800 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-12-07 21:18:46,800 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-12-07 21:18:46,800 INFO L138 SettingsManager]: * Interval Domain=false [2019-12-07 21:18:46,800 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-12-07 21:18:46,800 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-12-07 21:18:46,800 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-12-07 21:18:46,801 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 21:18:46,801 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 21:18:46,801 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 21:18:46,801 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 21:18:46,801 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 21:18:46,801 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-12-07 21:18:46,801 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 21:18:46,802 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-12-07 21:18:46,802 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-12-07 21:18:46,802 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 21:18:46,802 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-07 21:18:46,802 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 21:18:46,802 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-12-07 21:18:46,802 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 21:18:46,802 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 21:18:46,802 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 21:18:46,803 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 21:18:46,803 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 21:18:46,803 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 21:18:46,803 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-12-07 21:18:46,803 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-12-07 21:18:46,803 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-07 21:18:46,803 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-12-07 21:18:46,803 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 21:18:46,803 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-12-07 21:18:46,803 INFO L138 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/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/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 -> c721a987debd4748cfed075333b7fa46c2d0f9ef [2019-12-07 21:18:46,902 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 21:18:46,909 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 21:18:46,912 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 21:18:46,913 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 21:18:46,913 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 21:18:46,913 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/../../sv-benchmarks/c/reducercommutativity/max.i [2019-12-07 21:18:46,949 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/data/3306310a6/5163f91f521f468fb040de46f8ef6ea8/FLAGfddcad068 [2019-12-07 21:18:47,305 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 21:18:47,305 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/sv-benchmarks/c/reducercommutativity/max.i [2019-12-07 21:18:47,309 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/data/3306310a6/5163f91f521f468fb040de46f8ef6ea8/FLAGfddcad068 [2019-12-07 21:18:47,318 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/data/3306310a6/5163f91f521f468fb040de46f8ef6ea8 [2019-12-07 21:18:47,320 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 21:18:47,321 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 21:18:47,322 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 21:18:47,322 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 21:18:47,324 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 21:18:47,325 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 09:18:47" (1/1) ... [2019-12-07 21:18:47,327 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c51c803 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47, skipping insertion in model container [2019-12-07 21:18:47,327 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 09:18:47" (1/1) ... [2019-12-07 21:18:47,332 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 21:18:47,343 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 21:18:47,451 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 21:18:47,491 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 21:18:47,505 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 21:18:47,515 INFO L208 MainTranslator]: Completed translation [2019-12-07 21:18:47,515 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47 WrapperNode [2019-12-07 21:18:47,516 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 21:18:47,516 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 21:18:47,516 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 21:18:47,516 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 21:18:47,521 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47" (1/1) ... [2019-12-07 21:18:47,527 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47" (1/1) ... [2019-12-07 21:18:47,542 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 21:18:47,542 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 21:18:47,542 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 21:18:47,543 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 21:18:47,549 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47" (1/1) ... [2019-12-07 21:18:47,549 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47" (1/1) ... [2019-12-07 21:18:47,550 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47" (1/1) ... [2019-12-07 21:18:47,551 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47" (1/1) ... [2019-12-07 21:18:47,555 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47" (1/1) ... [2019-12-07 21:18:47,558 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47" (1/1) ... [2019-12-07 21:18:47,559 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47" (1/1) ... [2019-12-07 21:18:47,561 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 21:18:47,561 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 21:18:47,561 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 21:18:47,562 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 21:18:47,562 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/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 [2019-12-07 21:18:47,601 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-12-07 21:18:47,601 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 21:18:47,601 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 21:18:47,601 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-12-07 21:18:47,601 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-12-07 21:18:47,601 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-12-07 21:18:47,886 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 21:18:47,887 INFO L287 CfgBuilder]: Removed 14 assume(true) statements. [2019-12-07 21:18:47,887 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 09:18:47 BoogieIcfgContainer [2019-12-07 21:18:47,888 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 21:18:47,888 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 21:18:47,888 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 21:18:47,890 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 21:18:47,890 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 09:18:47" (1/3) ... [2019-12-07 21:18:47,891 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b39c11d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 09:18:47, skipping insertion in model container [2019-12-07 21:18:47,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:18:47" (2/3) ... [2019-12-07 21:18:47,891 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b39c11d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 09:18:47, skipping insertion in model container [2019-12-07 21:18:47,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 09:18:47" (3/3) ... [2019-12-07 21:18:47,892 INFO L109 eAbstractionObserver]: Analyzing ICFG max.i [2019-12-07 21:18:47,899 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 21:18:47,903 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-12-07 21:18:47,910 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-12-07 21:18:47,925 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 21:18:47,925 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-07 21:18:47,925 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 21:18:47,925 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 21:18:47,925 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 21:18:47,925 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 21:18:47,925 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 21:18:47,925 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 21:18:47,934 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2019-12-07 21:18:47,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-12-07 21:18:47,938 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:18:47,938 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:18:47,938 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:18:47,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:18:47,942 INFO L82 PathProgramCache]: Analyzing trace with hash 316726886, now seen corresponding path program 1 times [2019-12-07 21:18:47,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:18:47,948 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375331187] [2019-12-07 21:18:47,948 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:18:48,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:18:48,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:18:48,070 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375331187] [2019-12-07 21:18:48,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 21:18:48,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-12-07 21:18:48,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19443585] [2019-12-07 21:18:48,075 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-07 21:18:48,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 21:18:48,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-07 21:18:48,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-07 21:18:48,085 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 3 states. [2019-12-07 21:18:48,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:18:48,114 INFO L93 Difference]: Finished difference Result 22 states and 31 transitions. [2019-12-07 21:18:48,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-07 21:18:48,115 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2019-12-07 21:18:48,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:18:48,121 INFO L225 Difference]: With dead ends: 22 [2019-12-07 21:18:48,121 INFO L226 Difference]: Without dead ends: 10 [2019-12-07 21:18:48,123 INFO L630 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 [2019-12-07 21:18:48,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2019-12-07 21:18:48,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2019-12-07 21:18:48,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2019-12-07 21:18:48,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 13 transitions. [2019-12-07 21:18:48,144 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 13 transitions. Word has length 8 [2019-12-07 21:18:48,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:18:48,144 INFO L462 AbstractCegarLoop]: Abstraction has 10 states and 13 transitions. [2019-12-07 21:18:48,144 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-07 21:18:48,144 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 13 transitions. [2019-12-07 21:18:48,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-12-07 21:18:48,145 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:18:48,145 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:18:48,145 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:18:48,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:18:48,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1919844100, now seen corresponding path program 1 times [2019-12-07 21:18:48,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:18:48,145 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796264811] [2019-12-07 21:18:48,146 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:18:48,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:18:48,187 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 21:18:48,187 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796264811] [2019-12-07 21:18:48,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 21:18:48,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-12-07 21:18:48,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595795872] [2019-12-07 21:18:48,188 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-12-07 21:18:48,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 21:18:48,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-12-07 21:18:48,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-12-07 21:18:48,189 INFO L87 Difference]: Start difference. First operand 10 states and 13 transitions. Second operand 4 states. [2019-12-07 21:18:48,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:18:48,215 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2019-12-07 21:18:48,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 21:18:48,216 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2019-12-07 21:18:48,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:18:48,217 INFO L225 Difference]: With dead ends: 17 [2019-12-07 21:18:48,217 INFO L226 Difference]: Without dead ends: 12 [2019-12-07 21:18:48,217 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-12-07 21:18:48,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-12-07 21:18:48,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-12-07 21:18:48,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-12-07 21:18:48,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2019-12-07 21:18:48,221 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 9 [2019-12-07 21:18:48,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:18:48,221 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2019-12-07 21:18:48,221 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-12-07 21:18:48,221 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2019-12-07 21:18:48,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-12-07 21:18:48,221 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:18:48,222 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:18:48,222 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:18:48,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:18:48,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1613418518, now seen corresponding path program 1 times [2019-12-07 21:18:48,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:18:48,223 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [742183173] [2019-12-07 21:18:48,223 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:18:48,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:18:48,266 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-12-07 21:18:48,266 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [742183173] [2019-12-07 21:18:48,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 21:18:48,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-12-07 21:18:48,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982201430] [2019-12-07 21:18:48,267 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-12-07 21:18:48,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 21:18:48,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-12-07 21:18:48,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-12-07 21:18:48,267 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand 4 states. [2019-12-07 21:18:48,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:18:48,290 INFO L93 Difference]: Finished difference Result 18 states and 22 transitions. [2019-12-07 21:18:48,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 21:18:48,290 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2019-12-07 21:18:48,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:18:48,291 INFO L225 Difference]: With dead ends: 18 [2019-12-07 21:18:48,291 INFO L226 Difference]: Without dead ends: 13 [2019-12-07 21:18:48,291 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-12-07 21:18:48,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-12-07 21:18:48,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-12-07 21:18:48,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-12-07 21:18:48,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2019-12-07 21:18:48,293 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 11 [2019-12-07 21:18:48,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:18:48,294 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2019-12-07 21:18:48,294 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-12-07 21:18:48,294 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2019-12-07 21:18:48,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-12-07 21:18:48,294 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:18:48,294 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:18:48,294 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:18:48,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:18:48,295 INFO L82 PathProgramCache]: Analyzing trace with hash 1213038355, now seen corresponding path program 1 times [2019-12-07 21:18:48,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:18:48,295 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2100122030] [2019-12-07 21:18:48,295 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:18:48,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:18:48,329 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-12-07 21:18:48,329 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2100122030] [2019-12-07 21:18:48,330 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007142713] [2019-12-07 21:18:48,330 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:18:48,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:18:48,368 INFO L264 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 4 conjunts are in the unsatisfiable core [2019-12-07 21:18:48,372 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:18:48,398 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-12-07 21:18:48,398 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:18:48,412 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-12-07 21:18:48,412 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [283725925] [2019-12-07 21:18:48,428 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 21:18:48,428 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 21:18:48,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 21:18:48,436 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 21:18:48,436 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 21:18:48,748 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 21:18:48,913 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 21:18:48,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 21:18:48,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2019-12-07 21:18:48,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667982690] [2019-12-07 21:18:48,914 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-12-07 21:18:48,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 21:18:48,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-12-07 21:18:48,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2019-12-07 21:18:48,915 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand 7 states. [2019-12-07 21:18:48,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:18:48,943 INFO L93 Difference]: Finished difference Result 23 states and 29 transitions. [2019-12-07 21:18:48,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 21:18:48,943 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2019-12-07 21:18:48,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:18:48,943 INFO L225 Difference]: With dead ends: 23 [2019-12-07 21:18:48,944 INFO L226 Difference]: Without dead ends: 14 [2019-12-07 21:18:48,944 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2019-12-07 21:18:48,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-12-07 21:18:48,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-12-07 21:18:48,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-12-07 21:18:48,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2019-12-07 21:18:48,947 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 12 [2019-12-07 21:18:48,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:18:48,947 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2019-12-07 21:18:48,947 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-12-07 21:18:48,947 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2019-12-07 21:18:48,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-12-07 21:18:48,947 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:18:48,948 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:18:49,148 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:18:49,149 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:18:49,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:18:49,150 INFO L82 PathProgramCache]: Analyzing trace with hash -256008015, now seen corresponding path program 2 times [2019-12-07 21:18:49,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:18:49,151 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108474941] [2019-12-07 21:18:49,151 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:18:49,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:18:49,266 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-12-07 21:18:49,267 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108474941] [2019-12-07 21:18:49,267 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335672229] [2019-12-07 21:18:49,268 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:18:49,321 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-12-07 21:18:49,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 21:18:49,322 INFO L264 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 4 conjunts are in the unsatisfiable core [2019-12-07 21:18:49,323 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:18:49,341 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-12-07 21:18:49,342 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:18:49,354 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-12-07 21:18:49,354 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1425426655] [2019-12-07 21:18:49,355 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 21:18:49,355 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 21:18:49,356 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 21:18:49,356 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 21:18:49,356 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 21:18:49,556 INFO L180 IcfgInterpreter]: Interpretation finished [2019-12-07 21:18:49,726 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-12-07 21:18:49,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-12-07 21:18:49,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2019-12-07 21:18:49,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086578256] [2019-12-07 21:18:49,728 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-12-07 21:18:49,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 21:18:49,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-12-07 21:18:49,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2019-12-07 21:18:49,729 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand 8 states. [2019-12-07 21:18:49,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:18:49,760 INFO L93 Difference]: Finished difference Result 23 states and 29 transitions. [2019-12-07 21:18:49,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 21:18:49,761 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2019-12-07 21:18:49,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:18:49,761 INFO L225 Difference]: With dead ends: 23 [2019-12-07 21:18:49,761 INFO L226 Difference]: Without dead ends: 16 [2019-12-07 21:18:49,762 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2019-12-07 21:18:49,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-12-07 21:18:49,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-12-07 21:18:49,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-12-07 21:18:49,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2019-12-07 21:18:49,764 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 13 [2019-12-07 21:18:49,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:18:49,765 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2019-12-07 21:18:49,765 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-12-07 21:18:49,765 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2019-12-07 21:18:49,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-12-07 21:18:49,765 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:18:49,765 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:18:49,965 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:18:49,966 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:18:49,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:18:49,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1970607479, now seen corresponding path program 3 times [2019-12-07 21:18:49,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 21:18:49,966 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [221476199] [2019-12-07 21:18:49,966 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 21:18:50,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:18:53,222 WARN L192 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 42 [2019-12-07 21:18:53,354 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 41 [2019-12-07 21:19:03,473 WARN L192 SmtUtils]: Spent 10.09 s on a formula simplification. DAG size of input: 227 DAG size of output: 123 [2019-12-07 21:19:11,341 WARN L192 SmtUtils]: Spent 7.83 s on a formula simplification. DAG size of input: 260 DAG size of output: 172 [2019-12-07 21:19:20,837 WARN L192 SmtUtils]: Spent 7.42 s on a formula simplification. DAG size of input: 209 DAG size of output: 124 [2019-12-07 21:19:24,479 WARN L192 SmtUtils]: Spent 3.60 s on a formula simplification. DAG size of input: 190 DAG size of output: 119 [2019-12-07 21:19:28,820 WARN L192 SmtUtils]: Spent 4.26 s on a formula simplification. DAG size of input: 176 DAG size of output: 120 [2019-12-07 21:19:34,190 WARN L192 SmtUtils]: Spent 5.31 s on a formula simplification. DAG size of input: 163 DAG size of output: 115 [2019-12-07 21:19:51,259 WARN L192 SmtUtils]: Spent 16.99 s on a formula simplification. DAG size of input: 152 DAG size of output: 97 [2019-12-07 21:19:51,428 WARN L192 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 34 [2019-12-07 21:19:51,503 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:19:51,503 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [221476199] [2019-12-07 21:19:51,503 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338537160] [2019-12-07 21:19:51,503 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:19:51,547 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-12-07 21:19:51,547 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-12-07 21:19:51,548 WARN L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 76 conjunts are in the unsatisfiable core [2019-12-07 21:19:51,551 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:19:54,179 WARN L192 SmtUtils]: Spent 447.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 76 [2019-12-07 21:19:54,372 WARN L192 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2019-12-07 21:19:54,516 WARN L192 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2019-12-07 21:19:55,441 WARN L192 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2019-12-07 21:19:58,086 WARN L192 SmtUtils]: Spent 553.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 63 [2019-12-07 21:19:58,293 WARN L192 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2019-12-07 21:20:00,808 WARN L192 SmtUtils]: Spent 385.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 65 [2019-12-07 21:20:01,550 WARN L192 SmtUtils]: Spent 563.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 56 [2019-12-07 21:20:02,454 WARN L192 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2019-12-07 21:20:02,920 WARN L192 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2019-12-07 21:20:05,669 WARN L192 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2019-12-07 21:20:08,437 WARN L192 SmtUtils]: Spent 586.00 ms on a formula simplification. DAG size of input: 233 DAG size of output: 165 [2019-12-07 21:20:09,416 WARN L192 SmtUtils]: Spent 923.00 ms on a formula simplification. DAG size of input: 409 DAG size of output: 216 [2019-12-07 21:20:09,916 WARN L192 SmtUtils]: Spent 482.00 ms on a formula simplification that was a NOOP. DAG size: 208 [2019-12-07 21:20:10,391 WARN L192 SmtUtils]: Spent 457.00 ms on a formula simplification that was a NOOP. DAG size: 198 [2019-12-07 21:20:10,791 WARN L192 SmtUtils]: Spent 388.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2019-12-07 21:20:11,191 WARN L192 SmtUtils]: Spent 385.00 ms on a formula simplification that was a NOOP. DAG size: 180 [2019-12-07 21:20:11,555 WARN L192 SmtUtils]: Spent 352.00 ms on a formula simplification that was a NOOP. DAG size: 165 [2019-12-07 21:20:11,931 WARN L192 SmtUtils]: Spent 364.00 ms on a formula simplification that was a NOOP. DAG size: 151 [2019-12-07 21:20:12,220 WARN L192 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2019-12-07 21:20:12,485 WARN L192 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 126 [2019-12-07 21:20:12,694 WARN L192 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 111 [2019-12-07 21:20:12,869 WARN L192 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2019-12-07 21:20:13,010 WARN L192 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2019-12-07 21:20:13,339 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:20:13,340 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:20:14,218 WARN L192 SmtUtils]: Spent 347.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 66 [2019-12-07 21:20:14,501 WARN L192 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 66 [2019-12-07 21:20:15,425 WARN L192 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 79 [2019-12-07 21:20:17,751 WARN L192 SmtUtils]: Spent 703.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 103 [2019-12-07 21:20:22,759 WARN L192 SmtUtils]: Spent 764.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 133 [2019-12-07 21:20:23,882 WARN L192 SmtUtils]: Spent 876.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 50 [2019-12-07 21:20:24,138 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2019-12-07 21:20:24,190 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.IncrementalPlicationChecker@393c47e4 [2019-12-07 21:20:24,191 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [453025258] [2019-12-07 21:20:24,192 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-12-07 21:20:24,192 INFO L166 IcfgInterpreter]: Building call graph [2019-12-07 21:20:24,193 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-12-07 21:20:24,193 INFO L176 IcfgInterpreter]: Starting interpretation [2019-12-07 21:20:24,193 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-12-07 21:20:24,199 FATAL L? ?]: Ignoring exception! java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.IncrementalPlicationChecker@393c47e4 at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.managedscript.ManagedScript.lock(ManagedScript.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.IncrementalPlicationChecker.assertLhs(IncrementalPlicationChecker.java:74) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.IncrementalPlicationChecker.checkPlication(IncrementalPlicationChecker.java:106) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.ArrayIndexEqualityManager.(ArrayIndexEqualityManager.java:91) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.ElimStorePlain.computeCostEstimation(ElimStorePlain.java:555) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.ElimStorePlain.doElimAllRec(ElimStorePlain.java:428) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.ElimStorePlain.startRecursiveElimination(ElimStorePlain.java:234) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.PartialQuantifierElimination.elim(PartialQuantifierElimination.java:306) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.PartialQuantifierElimination.quantifier(PartialQuantifierElimination.java:146) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools$EliminatingTermDomainOperationProvider.newQuantifier(SymbolicTools.java:279) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools$EliminatingTermDomainOperationProvider.projectExistentially(SymbolicTools.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermDomainOperationProvider.projectExistentially(TermDomainOperationProvider.java:1) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateTransformer.strongestPostcondition(PredicateTransformer.java:131) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:116) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:297) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:190) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:180) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:75) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:463) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:419) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:368) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:139) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:332) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:174) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:126) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:120) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2019-12-07 21:20:24,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-12-07 21:20:24,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2019-12-07 21:20:24,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562555920] [2019-12-07 21:20:24,201 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-12-07 21:20:24,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 21:20:24,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-12-07 21:20:24,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1060, Unknown=8, NotChecked=0, Total=1190 [2019-12-07 21:20:24,202 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand 14 states. [2019-12-07 21:20:24,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-12-07 21:20:24,403 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:20:24,403 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.IncrementalPlicationChecker@393c47e4 at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.managedscript.ManagedScript.lock(ManagedScript.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.assertCodeBlock(IncrementalHoareTripleChecker.java:354) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.prepareAssertionStackAndAddTransition(IncrementalHoareTripleChecker.java:202) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.checkInternal(IncrementalHoareTripleChecker.java:127) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ProtectiveHoareTripleChecker.checkInternal(ProtectiveHoareTripleChecker.java:60) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.EfficientHoareTripleChecker.checkInternal(EfficientHoareTripleChecker.java:62) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.checkInternal(CachingHoareTripleChecker.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton$InternalSuccessorComputationHelper.computeSuccWithSolver(AbstractInterpolantAutomaton.java:359) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.addOtherSuccessors(DeterministicInterpolantAutomaton.java:197) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:77) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:234) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1066) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:968) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:188) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:698) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:627) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:454) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:368) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:139) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:332) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:174) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:126) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:120) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2019-12-07 21:20:24,405 INFO L168 Benchmark]: Toolchain (without parser) took 97084.36 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 381.2 MB). Free memory was 939.7 MB in the beginning and 946.7 MB in the end (delta: -7.0 MB). Peak memory consumption was 374.1 MB. Max. memory is 11.5 GB. [2019-12-07 21:20:24,405 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 1.0 GB. Free memory is still 955.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 21:20:24,406 INFO L168 Benchmark]: CACSL2BoogieTranslator took 193.83 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 107.5 MB). Free memory was 939.7 MB in the beginning and 1.1 GB in the end (delta: -161.5 MB). Peak memory consumption was 23.1 MB. Max. memory is 11.5 GB. [2019-12-07 21:20:24,406 INFO L168 Benchmark]: Boogie Procedure Inliner took 26.20 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 21:20:24,406 INFO L168 Benchmark]: Boogie Preprocessor took 18.78 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: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2019-12-07 21:20:24,406 INFO L168 Benchmark]: RCFGBuilder took 326.27 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: 38.0 MB). Peak memory consumption was 38.0 MB. Max. memory is 11.5 GB. [2019-12-07 21:20:24,407 INFO L168 Benchmark]: TraceAbstraction took 96516.42 ms. Allocated memory was 1.1 GB in the beginning and 1.4 GB in the end (delta: 273.7 MB). Free memory was 1.1 GB in the beginning and 946.7 MB in the end (delta: 111.1 MB). Peak memory consumption was 384.8 MB. Max. memory is 11.5 GB. [2019-12-07 21:20:24,409 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 1.0 GB. Free memory is still 955.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 193.83 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 107.5 MB). Free memory was 939.7 MB in the beginning and 1.1 GB in the end (delta: -161.5 MB). Peak memory consumption was 23.1 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 26.20 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 18.78 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: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * RCFGBuilder took 326.27 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: 38.0 MB). Peak memory consumption was 38.0 MB. Max. memory is 11.5 GB. * TraceAbstraction took 96516.42 ms. Allocated memory was 1.1 GB in the beginning and 1.4 GB in the end (delta: 273.7 MB). Free memory was 1.1 GB in the beginning and 946.7 MB in the end (delta: 111.1 MB). Peak memory consumption was 384.8 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.IncrementalPlicationChecker@393c47e4 de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.IncrementalPlicationChecker@393c47e4: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.managedscript.ManagedScript.lock(ManagedScript.java:83) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... ### Bit-precise run ### This is Ultimate 0.1.25-f470102 [2019-12-07 21:20:25,711 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 21:20:25,713 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 21:20:25,720 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 21:20:25,721 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 21:20:25,721 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 21:20:25,722 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 21:20:25,724 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 21:20:25,725 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 21:20:25,726 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 21:20:25,726 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 21:20:25,727 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 21:20:25,727 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 21:20:25,728 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 21:20:25,729 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 21:20:25,729 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 21:20:25,730 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 21:20:25,731 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 21:20:25,732 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 21:20:25,734 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 21:20:25,735 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 21:20:25,736 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 21:20:25,736 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 21:20:25,737 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 21:20:25,739 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 21:20:25,739 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 21:20:25,739 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 21:20:25,740 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 21:20:25,740 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 21:20:25,741 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 21:20:25,741 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 21:20:25,741 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 21:20:25,742 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 21:20:25,742 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 21:20:25,743 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 21:20:25,743 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 21:20:25,744 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 21:20:25,744 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 21:20:25,744 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 21:20:25,745 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 21:20:25,745 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 21:20:25,746 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2019-12-07 21:20:25,756 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 21:20:25,756 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 21:20:25,757 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-12-07 21:20:25,757 INFO L138 SettingsManager]: * User list type=DISABLED [2019-12-07 21:20:25,757 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-12-07 21:20:25,757 INFO L138 SettingsManager]: * Explicit value domain=true [2019-12-07 21:20:25,757 INFO L138 SettingsManager]: * Octagon Domain=false [2019-12-07 21:20:25,758 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-12-07 21:20:25,758 INFO L138 SettingsManager]: * Interval Domain=false [2019-12-07 21:20:25,758 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 21:20:25,758 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 21:20:25,758 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 21:20:25,759 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 21:20:25,759 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-12-07 21:20:25,759 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 21:20:25,759 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-12-07 21:20:25,759 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-12-07 21:20:25,759 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2019-12-07 21:20:25,759 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2019-12-07 21:20:25,760 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 21:20:25,760 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-07 21:20:25,760 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 21:20:25,760 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-12-07 21:20:25,760 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 21:20:25,760 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-12-07 21:20:25,760 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 21:20:25,761 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 21:20:25,761 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 21:20:25,761 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 21:20:25,761 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 21:20:25,761 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-12-07 21:20:25,761 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2019-12-07 21:20:25,761 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2019-12-07 21:20:25,762 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-12-07 21:20:25,762 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 21:20:25,762 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-12-07 21:20:25,762 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/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 -> c721a987debd4748cfed075333b7fa46c2d0f9ef [2019-12-07 21:20:25,923 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 21:20:25,931 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 21:20:25,934 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 21:20:25,935 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 21:20:25,935 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 21:20:25,936 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/../../sv-benchmarks/c/reducercommutativity/max.i [2019-12-07 21:20:25,978 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/data/e18c453b8/b9f23d1f1478487db3ca8032e46179b2/FLAG096518611 [2019-12-07 21:20:26,300 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 21:20:26,301 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/sv-benchmarks/c/reducercommutativity/max.i [2019-12-07 21:20:26,304 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/data/e18c453b8/b9f23d1f1478487db3ca8032e46179b2/FLAG096518611 [2019-12-07 21:20:26,313 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/data/e18c453b8/b9f23d1f1478487db3ca8032e46179b2 [2019-12-07 21:20:26,315 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 21:20:26,316 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 21:20:26,317 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 21:20:26,317 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 21:20:26,319 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 21:20:26,319 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 09:20:26" (1/1) ... [2019-12-07 21:20:26,321 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d2fed62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26, skipping insertion in model container [2019-12-07 21:20:26,321 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 09:20:26" (1/1) ... [2019-12-07 21:20:26,326 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 21:20:26,338 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 21:20:26,446 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 21:20:26,453 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 21:20:26,468 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 21:20:26,479 INFO L208 MainTranslator]: Completed translation [2019-12-07 21:20:26,479 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26 WrapperNode [2019-12-07 21:20:26,479 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 21:20:26,480 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 21:20:26,480 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 21:20:26,480 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 21:20:26,485 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26" (1/1) ... [2019-12-07 21:20:26,492 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26" (1/1) ... [2019-12-07 21:20:26,537 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 21:20:26,537 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 21:20:26,538 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 21:20:26,538 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 21:20:26,544 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26" (1/1) ... [2019-12-07 21:20:26,544 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26" (1/1) ... [2019-12-07 21:20:26,546 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26" (1/1) ... [2019-12-07 21:20:26,546 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26" (1/1) ... [2019-12-07 21:20:26,552 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26" (1/1) ... [2019-12-07 21:20:26,555 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26" (1/1) ... [2019-12-07 21:20:26,557 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26" (1/1) ... [2019-12-07 21:20:26,558 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 21:20:26,559 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 21:20:26,559 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 21:20:26,559 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 21:20:26,560 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/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 [2019-12-07 21:20:26,598 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2019-12-07 21:20:26,598 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 21:20:26,598 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 21:20:26,598 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-12-07 21:20:26,598 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-12-07 21:20:26,598 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2019-12-07 21:20:26,810 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 21:20:26,810 INFO L287 CfgBuilder]: Removed 14 assume(true) statements. [2019-12-07 21:20:26,811 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 09:20:26 BoogieIcfgContainer [2019-12-07 21:20:26,811 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 21:20:26,812 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 21:20:26,812 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 21:20:26,814 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 21:20:26,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 09:20:26" (1/3) ... [2019-12-07 21:20:26,815 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c721ce8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 09:20:26, skipping insertion in model container [2019-12-07 21:20:26,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 09:20:26" (2/3) ... [2019-12-07 21:20:26,816 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c721ce8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 09:20:26, skipping insertion in model container [2019-12-07 21:20:26,816 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 09:20:26" (3/3) ... [2019-12-07 21:20:26,817 INFO L109 eAbstractionObserver]: Analyzing ICFG max.i [2019-12-07 21:20:26,824 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 21:20:26,828 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-12-07 21:20:26,835 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-12-07 21:20:26,852 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 21:20:26,853 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-07 21:20:26,853 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 21:20:26,853 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 21:20:26,853 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 21:20:26,853 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 21:20:26,853 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 21:20:26,853 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 21:20:26,863 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2019-12-07 21:20:26,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-12-07 21:20:26,867 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:20:26,868 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:20:26,868 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:20:26,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:20:26,872 INFO L82 PathProgramCache]: Analyzing trace with hash -1699142909, now seen corresponding path program 1 times [2019-12-07 21:20:26,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-12-07 21:20:26,879 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1696268071] [2019-12-07 21:20:26,879 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/mathsat Starting monitored process 2 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with mathsat -unsat_core_generation=3 [2019-12-07 21:20:26,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:26,931 INFO L264 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 1 conjunts are in the unsatisfiable core [2019-12-07 21:20:26,934 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:26,944 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:20:26,945 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:20:26,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:20:26,949 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1696268071] [2019-12-07 21:20:26,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-12-07 21:20:26,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2019-12-07 21:20:26,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159374377] [2019-12-07 21:20:26,953 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-12-07 21:20:26,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-12-07 21:20:26,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-12-07 21:20:26,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-12-07 21:20:26,964 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 2 states. [2019-12-07 21:20:26,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:20:26,977 INFO L93 Difference]: Finished difference Result 57 states and 77 transitions. [2019-12-07 21:20:26,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-12-07 21:20:26,978 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2019-12-07 21:20:26,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:20:26,985 INFO L225 Difference]: With dead ends: 57 [2019-12-07 21:20:26,985 INFO L226 Difference]: Without dead ends: 27 [2019-12-07 21:20:26,988 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-12-07 21:20:26,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-12-07 21:20:27,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-12-07 21:20:27,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-12-07 21:20:27,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2019-12-07 21:20:27,012 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 16 [2019-12-07 21:20:27,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:20:27,012 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2019-12-07 21:20:27,012 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-12-07 21:20:27,012 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2019-12-07 21:20:27,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-12-07 21:20:27,013 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:20:27,013 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:20:27,213 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 mathsat -unsat_core_generation=3 [2019-12-07 21:20:27,214 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:20:27,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:20:27,214 INFO L82 PathProgramCache]: Analyzing trace with hash 2103090409, now seen corresponding path program 1 times [2019-12-07 21:20:27,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-12-07 21:20:27,216 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1396506584] [2019-12-07 21:20:27,216 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/mathsat Starting monitored process 3 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with mathsat -unsat_core_generation=3 [2019-12-07 21:20:27,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:27,309 INFO L264 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 10 conjunts are in the unsatisfiable core [2019-12-07 21:20:27,312 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:27,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:20:27,415 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:20:27,506 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:20:27,506 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1396506584] [2019-12-07 21:20:27,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-12-07 21:20:27,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10, 10] imperfect sequences [] total 15 [2019-12-07 21:20:27,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338212923] [2019-12-07 21:20:27,508 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-12-07 21:20:27,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-12-07 21:20:27,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-12-07 21:20:27,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2019-12-07 21:20:27,509 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand 15 states. [2019-12-07 21:20:27,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:20:27,775 INFO L93 Difference]: Finished difference Result 73 states and 90 transitions. [2019-12-07 21:20:27,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-12-07 21:20:27,775 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 16 [2019-12-07 21:20:27,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:20:27,777 INFO L225 Difference]: With dead ends: 73 [2019-12-07 21:20:27,777 INFO L226 Difference]: Without dead ends: 68 [2019-12-07 21:20:27,778 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2019-12-07 21:20:27,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-12-07 21:20:27,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 37. [2019-12-07 21:20:27,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-12-07 21:20:27,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2019-12-07 21:20:27,784 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 16 [2019-12-07 21:20:27,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:20:27,784 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2019-12-07 21:20:27,784 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-12-07 21:20:27,784 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2019-12-07 21:20:27,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-12-07 21:20:27,785 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:20:27,785 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:20:27,986 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 mathsat -unsat_core_generation=3 [2019-12-07 21:20:27,986 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:20:27,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:20:27,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1169172004, now seen corresponding path program 1 times [2019-12-07 21:20:27,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-12-07 21:20:27,988 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1962481270] [2019-12-07 21:20:27,988 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/mathsat Starting monitored process 4 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with mathsat -unsat_core_generation=3 [2019-12-07 21:20:28,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:28,074 INFO L264 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2019-12-07 21:20:28,075 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:28,086 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 21:20:28,087 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:20:28,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-12-07 21:20:28,095 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1962481270] [2019-12-07 21:20:28,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-12-07 21:20:28,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2019-12-07 21:20:28,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190147163] [2019-12-07 21:20:28,096 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-12-07 21:20:28,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-12-07 21:20:28,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-12-07 21:20:28,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-12-07 21:20:28,097 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 4 states. [2019-12-07 21:20:28,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:20:28,162 INFO L93 Difference]: Finished difference Result 61 states and 76 transitions. [2019-12-07 21:20:28,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-12-07 21:20:28,163 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2019-12-07 21:20:28,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:20:28,163 INFO L225 Difference]: With dead ends: 61 [2019-12-07 21:20:28,163 INFO L226 Difference]: Without dead ends: 32 [2019-12-07 21:20:28,164 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-12-07 21:20:28,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-12-07 21:20:28,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-12-07 21:20:28,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-12-07 21:20:28,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2019-12-07 21:20:28,167 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 20 [2019-12-07 21:20:28,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:20:28,167 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2019-12-07 21:20:28,167 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-12-07 21:20:28,167 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2019-12-07 21:20:28,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-12-07 21:20:28,168 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:20:28,168 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:20:28,369 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 mathsat -unsat_core_generation=3 [2019-12-07 21:20:28,369 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:20:28,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:20:28,369 INFO L82 PathProgramCache]: Analyzing trace with hash 2088882911, now seen corresponding path program 1 times [2019-12-07 21:20:28,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-12-07 21:20:28,370 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [540876723] [2019-12-07 21:20:28,371 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/mathsat Starting monitored process 5 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with mathsat -unsat_core_generation=3 [2019-12-07 21:20:28,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:28,453 INFO L264 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 21:20:28,454 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:28,503 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:20:28,503 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:20:28,609 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:20:28,610 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [540876723] [2019-12-07 21:20:28,610 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [40409110] [2019-12-07 21:20:28,610 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/cvc4 Starting monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-12-07 21:20:28,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:28,688 INFO L264 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 21:20:28,690 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:28,706 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:20:28,706 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:20:28,714 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 21:20:28,715 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134395066] [2019-12-07 21:20:28,715 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:20:28,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:28,776 INFO L264 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2019-12-07 21:20:28,777 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:28,788 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-12-07 21:20:28,788 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:20:28,792 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-12-07 21:20:28,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2019-12-07 21:20:28,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [7, 7, 7, 7] total 13 [2019-12-07 21:20:28,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575342025] [2019-12-07 21:20:28,793 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-12-07 21:20:28,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-12-07 21:20:28,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-12-07 21:20:28,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=95, Unknown=0, NotChecked=0, Total=156 [2019-12-07 21:20:28,794 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 6 states. [2019-12-07 21:20:28,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:20:28,901 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2019-12-07 21:20:28,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 21:20:28,901 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2019-12-07 21:20:28,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:20:28,902 INFO L225 Difference]: With dead ends: 56 [2019-12-07 21:20:28,903 INFO L226 Difference]: Without dead ends: 42 [2019-12-07 21:20:28,903 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 125 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=72, Invalid=110, Unknown=0, NotChecked=0, Total=182 [2019-12-07 21:20:28,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-12-07 21:20:28,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2019-12-07 21:20:28,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-12-07 21:20:28,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 51 transitions. [2019-12-07 21:20:28,909 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 51 transitions. Word has length 24 [2019-12-07 21:20:28,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:20:28,909 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 51 transitions. [2019-12-07 21:20:28,909 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-12-07 21:20:28,909 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 51 transitions. [2019-12-07 21:20:28,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-12-07 21:20:28,910 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:20:28,911 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:20:29,512 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 mathsat -unsat_core_generation=3,6 cvc4 --incremental --print-success --lang smt --rewrite-divk,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:20:29,513 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:20:29,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:20:29,514 INFO L82 PathProgramCache]: Analyzing trace with hash 1972386335, now seen corresponding path program 1 times [2019-12-07 21:20:29,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-12-07 21:20:29,516 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [359013941] [2019-12-07 21:20:29,516 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/mathsat Starting monitored process 8 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with mathsat -unsat_core_generation=3 [2019-12-07 21:20:29,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:29,605 INFO L264 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 21:20:29,608 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:29,656 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-12-07 21:20:29,657 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:20:29,830 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-12-07 21:20:29,831 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [359013941] [2019-12-07 21:20:29,831 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1885555171] [2019-12-07 21:20:29,831 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/cvc4 Starting monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-12-07 21:20:29,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:29,940 INFO L264 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 21:20:29,942 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:29,951 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-12-07 21:20:29,951 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:20:29,960 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-12-07 21:20:29,960 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220287468] [2019-12-07 21:20:29,961 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:20:30,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:30,006 INFO L264 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 7 conjunts are in the unsatisfiable core [2019-12-07 21:20:30,007 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:30,023 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-12-07 21:20:30,023 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:20:30,034 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-12-07 21:20:30,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2019-12-07 21:20:30,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 12 [2019-12-07 21:20:30,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278411999] [2019-12-07 21:20:30,036 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-12-07 21:20:30,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-12-07 21:20:30,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-12-07 21:20:30,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2019-12-07 21:20:30,037 INFO L87 Difference]: Start difference. First operand 42 states and 51 transitions. Second operand 12 states. [2019-12-07 21:20:30,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 21:20:30,375 INFO L93 Difference]: Finished difference Result 105 states and 130 transitions. [2019-12-07 21:20:30,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-12-07 21:20:30,376 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2019-12-07 21:20:30,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 21:20:30,377 INFO L225 Difference]: With dead ends: 105 [2019-12-07 21:20:30,377 INFO L226 Difference]: Without dead ends: 82 [2019-12-07 21:20:30,377 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 222 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=204, Unknown=0, NotChecked=0, Total=306 [2019-12-07 21:20:30,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2019-12-07 21:20:30,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 73. [2019-12-07 21:20:30,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-12-07 21:20:30,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 89 transitions. [2019-12-07 21:20:30,384 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 89 transitions. Word has length 40 [2019-12-07 21:20:30,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 21:20:30,384 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 89 transitions. [2019-12-07 21:20:30,384 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-12-07 21:20:30,384 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 89 transitions. [2019-12-07 21:20:30,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-12-07 21:20:30,385 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 21:20:30,385 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 21:20:30,986 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 cvc4 --incremental --print-success --lang smt --rewrite-divk,8 mathsat -unsat_core_generation=3,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:20:30,987 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 21:20:30,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 21:20:30,987 INFO L82 PathProgramCache]: Analyzing trace with hash -1969265475, now seen corresponding path program 1 times [2019-12-07 21:20:30,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-12-07 21:20:30,988 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [567860816] [2019-12-07 21:20:30,988 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/mathsat Starting monitored process 11 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with mathsat -unsat_core_generation=3 [2019-12-07 21:20:31,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:31,147 WARN L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 57 conjunts are in the unsatisfiable core [2019-12-07 21:20:31,149 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:31,608 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-12-07 21:20:31,615 INFO L377 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 27 [2019-12-07 21:20:31,615 INFO L534 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-12-07 21:20:31,641 INFO L614 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 21:20:31,642 INFO L534 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-12-07 21:20:31,642 INFO L239 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:70, output treesize:46 [2019-12-07 21:20:32,184 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-12-07 21:20:32,185 INFO L329 TraceCheckSpWp]: Computing backward predicates... [2019-12-07 21:20:37,688 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-12-07 21:20:37,689 INFO L377 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 195 treesize of output 161 [2019-12-07 21:20:37,689 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-12-07 21:20:37,694 INFO L430 ElimStorePlain]: Different costs {1=[v_arrayElimCell_4], 16=[v_arrayElimCell_3]} [2019-12-07 21:20:37,707 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [567860816] [2019-12-07 21:20:37,708 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.IncrementalPlicationChecker@483d9ce [2019-12-07 21:20:37,708 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [781311254] [2019-12-07 21:20:37,708 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/cvc4 Starting monitored process 12 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-12-07 21:20:37,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:37,883 WARN L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 52 conjunts are in the unsatisfiable core [2019-12-07 21:20:37,885 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:37,888 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.IncrementalPlicationChecker@483d9ce [2019-12-07 21:20:37,889 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749707823] [2019-12-07 21:20:37,889 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_90207729-b26f-4d1e-a090-1cc220243d41/bin/utaipan/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-12-07 21:20:37,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 21:20:37,985 WARN L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 56 conjunts are in the unsatisfiable core [2019-12-07 21:20:37,986 INFO L287 TraceCheckSpWp]: Computing forward predicates... [2019-12-07 21:20:37,989 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.IncrementalPlicationChecker@483d9ce [2019-12-07 21:20:37,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2019-12-07 21:20:37,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2019-12-07 21:20:37,989 ERROR L206 FreeRefinementEngine]: Strategy WALRUS failed to provide any proof altough trace is infeasible [2019-12-07 21:20:37,989 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-12-07 21:20:38,593 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 cvc4 --incremental --print-success --lang smt --rewrite-divk,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 mathsat -unsat_core_generation=3 [2019-12-07 21:20:38,613 WARN L229 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2019-12-07 21:20:38,613 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 09:20:38 BoogieIcfgContainer [2019-12-07 21:20:38,613 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 21:20:38,614 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 21:20:38,614 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 21:20:38,614 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 21:20:38,614 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 09:20:26" (3/4) ... [2019-12-07 21:20:38,617 INFO L140 WitnessPrinter]: No result that supports witness generation found [2019-12-07 21:20:38,617 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 21:20:38,618 INFO L168 Benchmark]: Toolchain (without parser) took 12301.61 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 208.1 MB). Free memory was 952.4 MB in the beginning and 875.5 MB in the end (delta: 76.9 MB). Peak memory consumption was 285.0 MB. Max. memory is 11.5 GB. [2019-12-07 21:20:38,618 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 981.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 21:20:38,618 INFO L168 Benchmark]: CACSL2BoogieTranslator took 162.66 ms. Allocated memory is still 1.0 GB. Free memory was 952.4 MB in the beginning and 941.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-12-07 21:20:38,619 INFO L168 Benchmark]: Boogie Procedure Inliner took 57.74 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.8 MB). Free memory was 941.6 MB in the beginning and 1.1 GB in the end (delta: -183.1 MB). Peak memory consumption was 15.5 MB. Max. memory is 11.5 GB. [2019-12-07 21:20:38,619 INFO L168 Benchmark]: Boogie Preprocessor took 21.12 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.9 MB). Peak memory consumption was 6.9 MB. Max. memory is 11.5 GB. [2019-12-07 21:20:38,620 INFO L168 Benchmark]: RCFGBuilder took 252.60 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 18.3 MB). Peak memory consumption was 18.3 MB. Max. memory is 11.5 GB. [2019-12-07 21:20:38,620 INFO L168 Benchmark]: TraceAbstraction took 11801.37 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 72.4 MB). Free memory was 1.1 GB in the beginning and 875.5 MB in the end (delta: 217.3 MB). Peak memory consumption was 289.7 MB. Max. memory is 11.5 GB. [2019-12-07 21:20:38,620 INFO L168 Benchmark]: Witness Printer took 2.97 ms. Allocated memory is still 1.2 GB. Free memory is still 875.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 21:20:38,622 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 981.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 162.66 ms. Allocated memory is still 1.0 GB. Free memory was 952.4 MB in the beginning and 941.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 57.74 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 135.8 MB). Free memory was 941.6 MB in the beginning and 1.1 GB in the end (delta: -183.1 MB). Peak memory consumption was 15.5 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 21.12 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.9 MB). Peak memory consumption was 6.9 MB. Max. memory is 11.5 GB. * RCFGBuilder took 252.60 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 18.3 MB). Peak memory consumption was 18.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 11801.37 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 72.4 MB). Free memory was 1.1 GB in the beginning and 875.5 MB in the end (delta: 217.3 MB). Peak memory consumption was 289.7 MB. Max. memory is 11.5 GB. * Witness Printer took 2.97 ms. Allocated memory is still 1.2 GB. Free memory is still 875.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 39]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L4] int N; [L19] N = __VERIFIER_nondet_int() [L20] COND TRUE N > 1 [L21] int x[N]; [L22] int temp; [L23] int ret; [L24] int ret2; [L25] int ret5; [L8] int i; [L9] long long ret; [L10] ret = 0 [L11] i = 0 [L11] COND TRUE i < N [L12] EXPR x[i] [L12] EXPR ret < x[i] ? x[i] : ret [L12] EXPR x[i] [L12] EXPR ret < x[i] ? x[i] : ret [L12] ret = ret < x[i] ? x[i] : ret [L11] i++ [L11] COND TRUE i < N [L12] EXPR x[i] [L12] EXPR ret < x[i] ? x[i] : ret [L12] EXPR x[i] [L12] EXPR ret < x[i] ? x[i] : ret [L12] ret = ret < x[i] ? x[i] : ret [L11] i++ [L11] COND FALSE !(i < N) [L14] return ret; [L27] ret = max(x) [L29] EXPR x[0] [L29] temp=x[0] [L29] EXPR x[1] [L29] x[0] = x[1] [L29] x[1] = temp [L8] int i; [L9] long long ret; [L10] ret = 0 [L11] i = 0 [L11] COND TRUE i < N [L12] EXPR x[i] [L12] EXPR ret < x[i] ? x[i] : ret [L12] EXPR x[i] [L12] EXPR ret < x[i] ? x[i] : ret [L12] ret = ret < x[i] ? x[i] : ret [L11] i++ [L11] COND TRUE i < N [L12] EXPR x[i] [L12] EXPR ret < x[i] ? x[i] : ret [L12] EXPR x[i] [L12] EXPR ret < x[i] ? x[i] : ret [L12] ret = ret < x[i] ? x[i] : ret [L11] i++ [L11] COND FALSE !(i < N) [L14] return ret; [L30] ret2 = max(x) [L31] EXPR x[0] [L31] temp=x[0] [L32] int i =0 ; [L32] COND TRUE i