./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b5699aa Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/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 ad4e6ad99a266ddeead98987e8e44db723af5bc7 ................................................................................................................................................................................................................................................................................................... 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_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/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 ad4e6ad99a266ddeead98987e8e44db723af5bc7 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.24-6b5699a [2019-11-26 02:57:24,624 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-26 02:57:24,625 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-26 02:57:24,639 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-26 02:57:24,639 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-26 02:57:24,640 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-26 02:57:24,642 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-26 02:57:24,650 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-26 02:57:24,654 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-26 02:57:24,658 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-26 02:57:24,659 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-26 02:57:24,660 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-26 02:57:24,660 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-26 02:57:24,662 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-26 02:57:24,663 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-26 02:57:24,664 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-26 02:57:24,665 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-26 02:57:24,665 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-26 02:57:24,668 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-26 02:57:24,671 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-26 02:57:24,675 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-26 02:57:24,678 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-26 02:57:24,679 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-26 02:57:24,680 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-26 02:57:24,682 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-26 02:57:24,682 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-26 02:57:24,683 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-26 02:57:24,684 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-26 02:57:24,684 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-26 02:57:24,685 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-26 02:57:24,686 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-26 02:57:24,686 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-26 02:57:24,687 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-26 02:57:24,688 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-26 02:57:24,688 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-26 02:57:24,689 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-26 02:57:24,689 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-26 02:57:24,689 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-26 02:57:24,689 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-26 02:57:24,690 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-26 02:57:24,691 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-26 02:57:24,692 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2019-11-26 02:57:24,716 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-26 02:57:24,716 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-26 02:57:24,717 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-26 02:57:24,717 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-26 02:57:24,717 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-26 02:57:24,717 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-26 02:57:24,717 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-26 02:57:24,718 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-26 02:57:24,718 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-26 02:57:24,718 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-26 02:57:24,718 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-26 02:57:24,718 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-26 02:57:24,718 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-26 02:57:24,719 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-26 02:57:24,719 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-26 02:57:24,719 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-26 02:57:24,720 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-26 02:57:24,720 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-26 02:57:24,720 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-26 02:57:24,720 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-26 02:57:24,720 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-26 02:57:24,720 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-26 02:57:24,721 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-26 02:57:24,721 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-26 02:57:24,721 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-26 02:57:24,721 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-26 02:57:24,721 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-26 02:57:24,721 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-26 02:57:24,722 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-26 02:57:24,722 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-26 02:57:24,722 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-26 02:57:24,722 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-26 02:57:24,722 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-26 02:57:24,723 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-26 02:57:24,723 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-26 02:57:24,723 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-26 02:57:24,723 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-26 02:57:24,723 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_eba63db6-fabd-4c33-8acd-f496457fe36c/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 -> ad4e6ad99a266ddeead98987e8e44db723af5bc7 [2019-11-26 02:57:24,885 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-26 02:57:24,894 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-26 02:57:24,897 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-26 02:57:24,898 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-26 02:57:24,899 INFO L275 PluginConnector]: CDTParser initialized [2019-11-26 02:57:24,899 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2019-11-26 02:57:24,951 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/data/fcf595048/e100d2a63b9b4a0396708d87071a8235/FLAG3c6d529e2 [2019-11-26 02:57:25,329 INFO L306 CDTParser]: Found 1 translation units. [2019-11-26 02:57:25,330 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2019-11-26 02:57:25,334 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/data/fcf595048/e100d2a63b9b4a0396708d87071a8235/FLAG3c6d529e2 [2019-11-26 02:57:25,345 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/data/fcf595048/e100d2a63b9b4a0396708d87071a8235 [2019-11-26 02:57:25,347 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-26 02:57:25,348 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-26 02:57:25,349 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-26 02:57:25,349 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-26 02:57:25,353 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-26 02:57:25,354 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 02:57:25" (1/1) ... [2019-11-26 02:57:25,356 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6394d352 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25, skipping insertion in model container [2019-11-26 02:57:25,356 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 02:57:25" (1/1) ... [2019-11-26 02:57:25,363 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-26 02:57:25,381 INFO L179 MainTranslator]: Built tables and reachable declarations [2019-11-26 02:57:25,556 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-26 02:57:25,560 INFO L201 MainTranslator]: Completed pre-run [2019-11-26 02:57:25,646 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-26 02:57:25,660 INFO L205 MainTranslator]: Completed translation [2019-11-26 02:57:25,660 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25 WrapperNode [2019-11-26 02:57:25,660 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-26 02:57:25,661 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-26 02:57:25,661 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-26 02:57:25,661 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-26 02:57:25,667 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25" (1/1) ... [2019-11-26 02:57:25,671 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25" (1/1) ... [2019-11-26 02:57:25,684 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-26 02:57:25,685 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-26 02:57:25,685 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-26 02:57:25,685 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-26 02:57:25,693 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25" (1/1) ... [2019-11-26 02:57:25,694 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25" (1/1) ... [2019-11-26 02:57:25,695 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25" (1/1) ... [2019-11-26 02:57:25,695 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25" (1/1) ... [2019-11-26 02:57:25,697 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25" (1/1) ... [2019-11-26 02:57:25,699 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25" (1/1) ... [2019-11-26 02:57:25,700 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25" (1/1) ... [2019-11-26 02:57:25,701 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-26 02:57:25,701 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-26 02:57:25,703 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-26 02:57:25,703 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-26 02:57:25,704 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/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 [2019-11-26 02:57:25,757 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-26 02:57:25,759 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-26 02:57:25,760 INFO L130 BoogieDeclarations]: Found specification of procedure id [2019-11-26 02:57:25,760 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2019-11-26 02:57:25,898 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-26 02:57:25,898 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-26 02:57:25,899 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:57:25 BoogieIcfgContainer [2019-11-26 02:57:25,899 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-26 02:57:25,900 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-26 02:57:25,900 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-26 02:57:25,903 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-26 02:57:25,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 02:57:25" (1/3) ... [2019-11-26 02:57:25,904 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cb3c394 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 02:57:25, skipping insertion in model container [2019-11-26 02:57:25,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:25" (2/3) ... [2019-11-26 02:57:25,904 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cb3c394 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 02:57:25, skipping insertion in model container [2019-11-26 02:57:25,905 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:57:25" (3/3) ... [2019-11-26 02:57:25,906 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i15_o15-2.c [2019-11-26 02:57:25,913 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-26 02:57:25,917 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-26 02:57:25,925 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-26 02:57:25,941 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-26 02:57:25,941 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-26 02:57:25,941 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-26 02:57:25,941 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-26 02:57:25,942 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-26 02:57:25,942 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-26 02:57:25,942 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-26 02:57:25,942 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-26 02:57:25,954 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states. [2019-11-26 02:57:25,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-26 02:57:25,960 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:25,960 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:25,961 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:25,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:25,965 INFO L82 PathProgramCache]: Analyzing trace with hash 389977641, now seen corresponding path program 1 times [2019-11-26 02:57:25,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-26 02:57:25,971 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245596185] [2019-11-26 02:57:25,971 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-26 02:57:26,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:57:26,186 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-26 02:57:26,186 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245596185] [2019-11-26 02:57:26,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-26 02:57:26,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-11-26 02:57:26,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893860609] [2019-11-26 02:57:26,192 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-26 02:57:26,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-26 02:57:26,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-26 02:57:26,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-11-26 02:57:26,212 INFO L87 Difference]: Start difference. First operand 14 states. Second operand 7 states. [2019-11-26 02:57:26,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:57:26,358 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2019-11-26 02:57:26,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-26 02:57:26,360 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2019-11-26 02:57:26,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:57:26,366 INFO L225 Difference]: With dead ends: 24 [2019-11-26 02:57:26,366 INFO L226 Difference]: Without dead ends: 14 [2019-11-26 02:57:26,369 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-11-26 02:57:26,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-26 02:57:26,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-26 02:57:26,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-26 02:57:26,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-11-26 02:57:26,397 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2019-11-26 02:57:26,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:57:26,398 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-11-26 02:57:26,398 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-26 02:57:26,398 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-11-26 02:57:26,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-26 02:57:26,399 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:26,399 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:26,400 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:26,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:26,400 INFO L82 PathProgramCache]: Analyzing trace with hash -881029229, now seen corresponding path program 1 times [2019-11-26 02:57:26,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-26 02:57:26,400 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1293993423] [2019-11-26 02:57:26,400 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-26 02:57:26,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:57:26,510 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-26 02:57:26,510 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1293993423] [2019-11-26 02:57:26,510 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11649294] [2019-11-26 02:57:26,511 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/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 [2019-11-26 02:57:26,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:57:26,548 INFO L255 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-26 02:57:26,553 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:26,628 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-26 02:57:26,628 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:26,793 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:26,845 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-26 02:57:26,846 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1373315866] [2019-11-26 02:57:26,870 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-26 02:57:26,870 INFO L166 IcfgInterpreter]: Building call graph [2019-11-26 02:57:26,876 FATAL L310 FreeRefinementEngine]: Exception during interpolant generation: IllegalArgumentException [2019-11-26 02:57:27,089 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:57:27,090 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) 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.TraceAbstractionStarter.iterate(TraceAbstractionStarter.java:333) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:171) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:123) 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) [2019-11-26 02:57:27,094 INFO L168 Benchmark]: Toolchain (without parser) took 1744.20 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 126.4 MB). Free memory was 947.5 MB in the beginning and 1.0 GB in the end (delta: -65.8 MB). Peak memory consumption was 60.5 MB. Max. memory is 11.5 GB. [2019-11-26 02:57:27,094 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 962.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-26 02:57:27,095 INFO L168 Benchmark]: CACSL2BoogieTranslator took 311.68 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 126.4 MB). Free memory was 947.5 MB in the beginning and 1.1 GB in the end (delta: -169.3 MB). Peak memory consumption was 24.6 MB. Max. memory is 11.5 GB. [2019-11-26 02:57:27,096 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.40 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-26 02:57:27,096 INFO L168 Benchmark]: Boogie Preprocessor took 16.38 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-26 02:57:27,097 INFO L168 Benchmark]: RCFGBuilder took 198.08 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: 15.4 MB). Peak memory consumption was 15.4 MB. Max. memory is 11.5 GB. [2019-11-26 02:57:27,112 INFO L168 Benchmark]: TraceAbstraction took 1191.24 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 88.0 MB). Peak memory consumption was 88.0 MB. Max. memory is 11.5 GB. [2019-11-26 02:57:27,115 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 962.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 311.68 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 126.4 MB). Free memory was 947.5 MB in the beginning and 1.1 GB in the end (delta: -169.3 MB). Peak memory consumption was 24.6 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 23.40 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 16.38 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 198.08 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: 15.4 MB). Peak memory consumption was 15.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1191.24 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 88.0 MB). Peak memory consumption was 88.0 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: IllegalArgumentException: Recursive programs are not supported. de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: IllegalArgumentException: Recursive programs are not supported.: de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... ### Bit-precise run ### This is Ultimate 0.1.24-6b5699a [2019-11-26 02:57:28,996 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-26 02:57:28,998 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-26 02:57:29,008 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-26 02:57:29,009 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-26 02:57:29,010 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-26 02:57:29,013 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-26 02:57:29,023 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-26 02:57:29,025 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-26 02:57:29,025 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-26 02:57:29,026 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-26 02:57:29,027 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-26 02:57:29,027 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-26 02:57:29,028 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-26 02:57:29,029 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-26 02:57:29,030 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-26 02:57:29,031 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-26 02:57:29,032 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-26 02:57:29,033 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-26 02:57:29,037 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-26 02:57:29,042 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-26 02:57:29,046 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-26 02:57:29,047 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-26 02:57:29,049 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-26 02:57:29,056 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-26 02:57:29,057 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-26 02:57:29,057 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-26 02:57:29,059 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-26 02:57:29,059 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-26 02:57:29,060 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-26 02:57:29,061 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-26 02:57:29,061 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-26 02:57:29,062 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-26 02:57:29,063 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-26 02:57:29,064 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-26 02:57:29,064 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-26 02:57:29,065 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-26 02:57:29,065 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-26 02:57:29,065 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-26 02:57:29,066 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-26 02:57:29,067 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-26 02:57:29,068 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2019-11-26 02:57:29,096 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-26 02:57:29,097 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-26 02:57:29,097 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-26 02:57:29,097 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-26 02:57:29,098 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-26 02:57:29,098 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-26 02:57:29,098 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-26 02:57:29,098 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-26 02:57:29,098 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-26 02:57:29,099 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-26 02:57:29,099 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-26 02:57:29,100 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-26 02:57:29,100 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-26 02:57:29,100 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-26 02:57:29,100 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-26 02:57:29,100 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-26 02:57:29,101 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-26 02:57:29,101 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2019-11-26 02:57:29,101 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2019-11-26 02:57:29,101 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-26 02:57:29,101 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-26 02:57:29,102 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-26 02:57:29,102 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-26 02:57:29,102 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-26 02:57:29,102 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-26 02:57:29,102 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-26 02:57:29,103 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-26 02:57:29,103 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-26 02:57:29,103 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-26 02:57:29,113 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-26 02:57:29,113 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-26 02:57:29,113 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2019-11-26 02:57:29,114 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2019-11-26 02:57:29,114 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-26 02:57:29,114 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-26 02:57:29,114 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_eba63db6-fabd-4c33-8acd-f496457fe36c/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 -> ad4e6ad99a266ddeead98987e8e44db723af5bc7 [2019-11-26 02:57:29,369 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-26 02:57:29,382 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-26 02:57:29,385 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-26 02:57:29,386 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-26 02:57:29,387 INFO L275 PluginConnector]: CDTParser initialized [2019-11-26 02:57:29,387 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2019-11-26 02:57:29,446 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/data/faf1447e3/7609134f847e44adb4aaffd1273d419c/FLAGbcdbf8636 [2019-11-26 02:57:29,834 INFO L306 CDTParser]: Found 1 translation units. [2019-11-26 02:57:29,834 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2019-11-26 02:57:29,839 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/data/faf1447e3/7609134f847e44adb4aaffd1273d419c/FLAGbcdbf8636 [2019-11-26 02:57:30,251 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/data/faf1447e3/7609134f847e44adb4aaffd1273d419c [2019-11-26 02:57:30,254 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-26 02:57:30,255 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-26 02:57:30,259 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-26 02:57:30,259 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-26 02:57:30,263 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-26 02:57:30,263 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 02:57:30" (1/1) ... [2019-11-26 02:57:30,266 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ca74fa6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30, skipping insertion in model container [2019-11-26 02:57:30,266 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 02:57:30" (1/1) ... [2019-11-26 02:57:30,273 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-26 02:57:30,285 INFO L179 MainTranslator]: Built tables and reachable declarations [2019-11-26 02:57:30,428 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-26 02:57:30,434 INFO L201 MainTranslator]: Completed pre-run [2019-11-26 02:57:30,452 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-26 02:57:30,464 INFO L205 MainTranslator]: Completed translation [2019-11-26 02:57:30,464 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30 WrapperNode [2019-11-26 02:57:30,465 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-26 02:57:30,465 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-26 02:57:30,465 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-26 02:57:30,465 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-26 02:57:30,473 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30" (1/1) ... [2019-11-26 02:57:30,479 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30" (1/1) ... [2019-11-26 02:57:30,494 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-26 02:57:30,494 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-26 02:57:30,494 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-26 02:57:30,495 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-26 02:57:30,549 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30" (1/1) ... [2019-11-26 02:57:30,549 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30" (1/1) ... [2019-11-26 02:57:30,550 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30" (1/1) ... [2019-11-26 02:57:30,550 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30" (1/1) ... [2019-11-26 02:57:30,554 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30" (1/1) ... [2019-11-26 02:57:30,556 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30" (1/1) ... [2019-11-26 02:57:30,556 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30" (1/1) ... [2019-11-26 02:57:30,558 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-26 02:57:30,558 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-26 02:57:30,558 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-26 02:57:30,558 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-26 02:57:30,564 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/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 [2019-11-26 02:57:30,621 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-26 02:57:30,622 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-26 02:57:30,622 INFO L130 BoogieDeclarations]: Found specification of procedure id [2019-11-26 02:57:30,624 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2019-11-26 02:57:30,756 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-26 02:57:30,756 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-26 02:57:30,757 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:57:30 BoogieIcfgContainer [2019-11-26 02:57:30,757 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-26 02:57:30,758 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-26 02:57:30,758 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-26 02:57:30,760 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-26 02:57:30,760 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 02:57:30" (1/3) ... [2019-11-26 02:57:30,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13748337 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 02:57:30, skipping insertion in model container [2019-11-26 02:57:30,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:57:30" (2/3) ... [2019-11-26 02:57:30,762 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13748337 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 02:57:30, skipping insertion in model container [2019-11-26 02:57:30,762 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:57:30" (3/3) ... [2019-11-26 02:57:30,763 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i15_o15-2.c [2019-11-26 02:57:30,771 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-26 02:57:30,775 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-26 02:57:30,784 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-26 02:57:30,805 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-26 02:57:30,805 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-26 02:57:30,805 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-26 02:57:30,805 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-26 02:57:30,805 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-26 02:57:30,805 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-26 02:57:30,805 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-26 02:57:30,806 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-26 02:57:30,818 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2019-11-26 02:57:30,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-26 02:57:30,823 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:30,823 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:30,824 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:30,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:30,829 INFO L82 PathProgramCache]: Analyzing trace with hash 389977641, now seen corresponding path program 1 times [2019-11-26 02:57:30,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:57:30,837 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [831110565] [2019-11-26 02:57:30,837 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/cvc4 Starting monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:30,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:57:30,884 INFO L255 TraceCheckSpWp]: Trace formula consists of 14 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-26 02:57:30,889 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:30,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-26 02:57:30,962 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:31,064 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-26 02:57:31,065 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [831110565] [2019-11-26 02:57:31,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-26 02:57:31,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2019-11-26 02:57:31,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297431015] [2019-11-26 02:57:31,070 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-26 02:57:31,070 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:57:31,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-26 02:57:31,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-11-26 02:57:31,081 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 7 states. [2019-11-26 02:57:31,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:57:31,191 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2019-11-26 02:57:31,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-26 02:57:31,194 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2019-11-26 02:57:31,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:57:31,206 INFO L225 Difference]: With dead ends: 24 [2019-11-26 02:57:31,206 INFO L226 Difference]: Without dead ends: 14 [2019-11-26 02:57:31,212 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-11-26 02:57:31,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-26 02:57:31,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-26 02:57:31,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-26 02:57:31,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-11-26 02:57:31,245 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2019-11-26 02:57:31,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:57:31,245 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-11-26 02:57:31,246 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-26 02:57:31,246 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-11-26 02:57:31,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-26 02:57:31,247 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:31,247 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:31,448 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:31,448 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:31,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:31,448 INFO L82 PathProgramCache]: Analyzing trace with hash -881029229, now seen corresponding path program 1 times [2019-11-26 02:57:31,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:57:31,449 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [351634742] [2019-11-26 02:57:31,449 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/cvc4 Starting monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:31,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:57:31,477 INFO L255 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-26 02:57:31,478 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:31,532 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-26 02:57:31,536 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:31,712 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:31,746 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-26 02:57:31,746 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [351634742] [2019-11-26 02:57:31,747 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488034533] [2019-11-26 02:57:31,747 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/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 [2019-11-26 02:57:31,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:57:31,793 INFO L255 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-26 02:57:31,794 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:31,800 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-26 02:57:31,803 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:31,905 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:31,909 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-26 02:57:31,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:57:31,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 6, 7] total 9 [2019-11-26 02:57:31,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531861388] [2019-11-26 02:57:31,927 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-26 02:57:31,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:57:31,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-26 02:57:31,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2019-11-26 02:57:31,929 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 9 states. [2019-11-26 02:57:32,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:57:32,014 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2019-11-26 02:57:32,016 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-26 02:57:32,016 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2019-11-26 02:57:32,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:57:32,017 INFO L225 Difference]: With dead ends: 21 [2019-11-26 02:57:32,017 INFO L226 Difference]: Without dead ends: 17 [2019-11-26 02:57:32,018 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2019-11-26 02:57:32,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-26 02:57:32,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-26 02:57:32,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-26 02:57:32,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-11-26 02:57:32,023 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2019-11-26 02:57:32,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:57:32,026 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-11-26 02:57:32,026 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-26 02:57:32,026 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-11-26 02:57:32,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-26 02:57:32,029 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:32,029 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:32,431 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 cvc4 --incremental --print-success --lang smt --rewrite-divk,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:57:32,431 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:32,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:32,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1824240471, now seen corresponding path program 2 times [2019-11-26 02:57:32,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:57:32,432 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [2001088863] [2019-11-26 02:57:32,432 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:32,464 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-26 02:57:32,464 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:32,465 INFO L255 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-26 02:57:32,467 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:32,529 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-26 02:57:32,530 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:32,767 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:32,816 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:32,844 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-26 02:57:32,845 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2001088863] [2019-11-26 02:57:32,845 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751922164] [2019-11-26 02:57:32,845 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:57:32,885 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-26 02:57:32,885 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:32,886 INFO L255 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-26 02:57:32,888 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:32,899 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-26 02:57:32,899 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:33,088 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:33,127 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:33,131 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-26 02:57:33,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:57:33,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 7, 9] total 11 [2019-11-26 02:57:33,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210587392] [2019-11-26 02:57:33,132 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-26 02:57:33,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:57:33,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-26 02:57:33,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2019-11-26 02:57:33,133 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 11 states. [2019-11-26 02:57:33,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:57:33,242 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2019-11-26 02:57:33,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-26 02:57:33,243 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 21 [2019-11-26 02:57:33,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:57:33,244 INFO L225 Difference]: With dead ends: 24 [2019-11-26 02:57:33,244 INFO L226 Difference]: Without dead ends: 20 [2019-11-26 02:57:33,244 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-11-26 02:57:33,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-26 02:57:33,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-26 02:57:33,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-26 02:57:33,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-11-26 02:57:33,250 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 21 [2019-11-26 02:57:33,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:57:33,250 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-11-26 02:57:33,250 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-26 02:57:33,250 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-11-26 02:57:33,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-26 02:57:33,252 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:33,252 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:33,656 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 cvc4 --incremental --print-success --lang smt --rewrite-divk,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:57:33,656 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:33,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:33,656 INFO L82 PathProgramCache]: Analyzing trace with hash -28473709, now seen corresponding path program 3 times [2019-11-26 02:57:33,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:57:33,657 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1607879345] [2019-11-26 02:57:33,657 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/cvc4 Starting monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:33,713 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-26 02:57:33,714 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:33,715 INFO L255 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-26 02:57:33,716 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:33,781 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-26 02:57:33,781 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:34,074 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:34,148 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:34,203 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:34,228 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-26 02:57:34,228 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1607879345] [2019-11-26 02:57:34,229 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228521121] [2019-11-26 02:57:34,229 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:57:34,259 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-26 02:57:34,260 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:34,261 INFO L255 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-26 02:57:34,262 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:34,268 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-26 02:57:34,268 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:34,467 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:34,529 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:34,554 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:34,559 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-26 02:57:34,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:57:34,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 8, 11] total 13 [2019-11-26 02:57:34,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534423233] [2019-11-26 02:57:34,561 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-26 02:57:34,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:57:34,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-26 02:57:34,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2019-11-26 02:57:34,562 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 13 states. [2019-11-26 02:57:34,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:57:34,682 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2019-11-26 02:57:34,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-26 02:57:34,683 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2019-11-26 02:57:34,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:57:34,684 INFO L225 Difference]: With dead ends: 27 [2019-11-26 02:57:34,685 INFO L226 Difference]: Without dead ends: 23 [2019-11-26 02:57:34,685 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2019-11-26 02:57:34,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-26 02:57:34,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-11-26 02:57:34,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-26 02:57:34,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-11-26 02:57:34,690 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 27 [2019-11-26 02:57:34,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:57:34,691 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-11-26 02:57:34,691 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-26 02:57:34,692 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-11-26 02:57:34,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-26 02:57:34,693 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:34,693 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:35,094 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 cvc4 --incremental --print-success --lang smt --rewrite-divk,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:57:35,095 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:35,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:35,095 INFO L82 PathProgramCache]: Analyzing trace with hash -2080894167, now seen corresponding path program 4 times [2019-11-26 02:57:35,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:57:35,096 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [605199435] [2019-11-26 02:57:35,096 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/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 [2019-11-26 02:57:35,136 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-26 02:57:35,136 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:35,138 INFO L255 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-26 02:57:35,140 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:35,202 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-26 02:57:35,202 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:35,530 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:35,690 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:35,784 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:35,826 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:35,845 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-26 02:57:35,846 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [605199435] [2019-11-26 02:57:35,846 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632475784] [2019-11-26 02:57:35,846 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/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 [2019-11-26 02:57:35,889 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-26 02:57:35,889 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:35,891 INFO L255 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-26 02:57:35,892 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:35,898 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-26 02:57:35,899 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:36,164 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:36,267 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:36,325 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:36,354 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:36,359 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-26 02:57:36,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:57:36,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 9, 13] total 15 [2019-11-26 02:57:36,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017375885] [2019-11-26 02:57:36,361 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-26 02:57:36,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:57:36,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-26 02:57:36,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2019-11-26 02:57:36,362 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 15 states. [2019-11-26 02:57:36,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:57:36,517 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2019-11-26 02:57:36,518 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-26 02:57:36,518 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 33 [2019-11-26 02:57:36,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:57:36,519 INFO L225 Difference]: With dead ends: 30 [2019-11-26 02:57:36,519 INFO L226 Difference]: Without dead ends: 26 [2019-11-26 02:57:36,519 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2019-11-26 02:57:36,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-26 02:57:36,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-26 02:57:36,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-26 02:57:36,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2019-11-26 02:57:36,527 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 33 [2019-11-26 02:57:36,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:57:36,528 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2019-11-26 02:57:36,528 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-26 02:57:36,528 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2019-11-26 02:57:36,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-26 02:57:36,529 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:36,529 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:36,932 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 cvc4 --incremental --print-success --lang smt --rewrite-divk,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:57:36,933 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:36,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:36,933 INFO L82 PathProgramCache]: Analyzing trace with hash -687460973, now seen corresponding path program 5 times [2019-11-26 02:57:36,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:57:36,934 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1862103898] [2019-11-26 02:57:36,934 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/cvc4 Starting monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:36,994 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-26 02:57:36,994 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:36,995 INFO L255 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-26 02:57:36,997 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:37,063 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-11-26 02:57:37,063 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:37,400 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:37,544 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:37,626 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:37,694 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:37,731 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:37,763 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-26 02:57:37,763 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1862103898] [2019-11-26 02:57:37,764 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139671348] [2019-11-26 02:57:37,764 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:57:37,836 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-26 02:57:37,836 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:37,838 INFO L255 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-26 02:57:37,839 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:37,847 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-11-26 02:57:37,847 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:38,223 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:38,346 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:38,423 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:38,466 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:38,502 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:38,507 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-26 02:57:38,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:57:38,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15, 10, 15] total 17 [2019-11-26 02:57:38,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953528335] [2019-11-26 02:57:38,508 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-26 02:57:38,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:57:38,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-26 02:57:38,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2019-11-26 02:57:38,509 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 17 states. [2019-11-26 02:57:38,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:57:38,703 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2019-11-26 02:57:38,708 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-26 02:57:38,709 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2019-11-26 02:57:38,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:57:38,710 INFO L225 Difference]: With dead ends: 33 [2019-11-26 02:57:38,710 INFO L226 Difference]: Without dead ends: 29 [2019-11-26 02:57:38,711 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2019-11-26 02:57:38,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-26 02:57:38,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-11-26 02:57:38,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-26 02:57:38,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2019-11-26 02:57:38,719 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 39 [2019-11-26 02:57:38,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:57:38,721 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2019-11-26 02:57:38,721 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-26 02:57:38,721 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2019-11-26 02:57:38,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-26 02:57:38,723 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:38,723 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:39,127 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:39,127 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:39,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:39,127 INFO L82 PathProgramCache]: Analyzing trace with hash 547744169, now seen corresponding path program 6 times [2019-11-26 02:57:39,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:57:39,128 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1874580751] [2019-11-26 02:57:39,128 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/cvc4 Starting monitored process 13 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:39,215 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-26 02:57:39,215 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:39,216 INFO L255 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-26 02:57:39,218 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:39,419 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-11-26 02:57:39,419 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:40,140 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-11-26 02:57:40,140 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1874580751] [2019-11-26 02:57:40,140 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2032502135] [2019-11-26 02:57:40,140 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:57:40,191 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-26 02:57:40,191 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:40,193 INFO L255 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-26 02:57:40,195 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:40,245 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-11-26 02:57:40,245 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:40,675 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-11-26 02:57:40,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:57:40,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17] total 32 [2019-11-26 02:57:40,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910809793] [2019-11-26 02:57:40,676 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-26 02:57:40,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:57:40,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-26 02:57:40,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=844, Unknown=0, NotChecked=0, Total=992 [2019-11-26 02:57:40,677 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 32 states. [2019-11-26 02:57:41,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:57:41,156 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2019-11-26 02:57:41,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-26 02:57:41,157 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 45 [2019-11-26 02:57:41,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:57:41,159 INFO L225 Difference]: With dead ends: 56 [2019-11-26 02:57:41,159 INFO L226 Difference]: Without dead ends: 50 [2019-11-26 02:57:41,160 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 144 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=293, Invalid=1429, Unknown=0, NotChecked=0, Total=1722 [2019-11-26 02:57:41,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-26 02:57:41,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2019-11-26 02:57:41,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-26 02:57:41,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2019-11-26 02:57:41,169 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 45 [2019-11-26 02:57:41,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:57:41,170 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2019-11-26 02:57:41,170 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-26 02:57:41,170 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2019-11-26 02:57:41,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-11-26 02:57:41,173 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:41,174 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:41,576 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:41,576 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:41,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:41,576 INFO L82 PathProgramCache]: Analyzing trace with hash -1887065709, now seen corresponding path program 7 times [2019-11-26 02:57:41,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:57:41,577 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1670597783] [2019-11-26 02:57:41,577 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/cvc4 Starting monitored process 15 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:41,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:57:41,641 INFO L255 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-26 02:57:41,643 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:41,846 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-11-26 02:57:41,846 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:42,648 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:42,947 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:43,258 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:43,545 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:43,805 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:44,051 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:44,251 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:44,417 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:44,568 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:44,711 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:44,819 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:44,890 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:44,938 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:44,995 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-11-26 02:57:44,995 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1670597783] [2019-11-26 02:57:44,995 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999963932] [2019-11-26 02:57:44,995 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:57:45,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:57:45,059 INFO L255 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-26 02:57:45,061 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:45,099 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-11-26 02:57:45,099 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:45,759 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:46,031 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:46,304 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:46,542 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:46,803 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:46,994 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:47,169 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:47,330 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:47,465 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:47,575 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:47,642 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:47,688 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:47,708 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:47,737 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-11-26 02:57:47,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:57:47,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 31, 18, 31] total 33 [2019-11-26 02:57:47,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488384228] [2019-11-26 02:57:47,738 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-26 02:57:47,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:57:47,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-26 02:57:47,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2019-11-26 02:57:47,740 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 33 states. [2019-11-26 02:57:48,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:57:48,157 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2019-11-26 02:57:48,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-26 02:57:48,158 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 87 [2019-11-26 02:57:48,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:57:48,159 INFO L225 Difference]: With dead ends: 57 [2019-11-26 02:57:48,160 INFO L226 Difference]: Without dead ends: 53 [2019-11-26 02:57:48,161 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 301 SyntacticMatches, 12 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=344, Invalid=1818, Unknown=0, NotChecked=0, Total=2162 [2019-11-26 02:57:48,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-11-26 02:57:48,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2019-11-26 02:57:48,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-11-26 02:57:48,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2019-11-26 02:57:48,168 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 87 [2019-11-26 02:57:48,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:57:48,169 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2019-11-26 02:57:48,169 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-26 02:57:48,169 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2019-11-26 02:57:48,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-11-26 02:57:48,170 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:48,171 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:48,574 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:48,575 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:48,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:48,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1777212503, now seen corresponding path program 8 times [2019-11-26 02:57:48,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:57:48,575 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [267116123] [2019-11-26 02:57:48,575 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/cvc4 Starting monitored process 17 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:48,663 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-26 02:57:48,663 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:48,664 INFO L255 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 32 conjunts are in the unsatisfiable core [2019-11-26 02:57:48,666 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:48,884 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2019-11-26 02:57:48,885 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:49,802 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:50,142 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:50,426 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:50,699 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:50,955 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:51,258 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:51,514 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:51,694 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:51,867 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:52,003 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:52,120 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:52,214 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:52,286 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:52,337 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:52,403 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-11-26 02:57:52,403 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [267116123] [2019-11-26 02:57:52,403 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917393347] [2019-11-26 02:57:52,403 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:57:52,497 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-26 02:57:52,497 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:57:52,501 INFO L255 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 32 conjunts are in the unsatisfiable core [2019-11-26 02:57:52,503 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:57:52,555 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2019-11-26 02:57:52,555 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:57:53,447 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:53,751 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:54,023 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:54,266 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:54,551 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:54,762 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:54,942 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:55,095 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:55,228 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:55,359 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:55,448 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:55,514 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:55,555 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:55,573 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-26 02:57:55,592 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-11-26 02:57:55,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:57:55,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 33, 19, 33] total 35 [2019-11-26 02:57:55,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781843400] [2019-11-26 02:57:55,594 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-26 02:57:55,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:57:55,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-26 02:57:55,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2019-11-26 02:57:55,595 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 35 states. [2019-11-26 02:57:56,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:57:56,044 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2019-11-26 02:57:56,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-26 02:57:56,044 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 93 [2019-11-26 02:57:56,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:57:56,046 INFO L225 Difference]: With dead ends: 60 [2019-11-26 02:57:56,046 INFO L226 Difference]: Without dead ends: 56 [2019-11-26 02:57:56,047 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 318 SyntacticMatches, 17 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=383, Invalid=2067, Unknown=0, NotChecked=0, Total=2450 [2019-11-26 02:57:56,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-26 02:57:56,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-11-26 02:57:56,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-26 02:57:56,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2019-11-26 02:57:56,054 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 93 [2019-11-26 02:57:56,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:57:56,054 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2019-11-26 02:57:56,054 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-26 02:57:56,055 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2019-11-26 02:57:56,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-11-26 02:57:56,056 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:57:56,056 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:57:56,464 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:56,464 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:57:56,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:57:56,464 INFO L82 PathProgramCache]: Analyzing trace with hash -948911981, now seen corresponding path program 9 times [2019-11-26 02:57:56,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:57:56,465 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [44976088] [2019-11-26 02:57:56,465 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/cvc4 Starting monitored process 19 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:56,703 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-11-26 02:57:56,703 INFO L250 tOrderPrioritization]: Conjunction of SSA is sat [2019-11-26 02:57:56,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-26 02:57:56,835 INFO L174 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2019-11-26 02:57:56,835 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-26 02:57:57,035 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:57:57,063 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.11 02:57:57 BoogieIcfgContainer [2019-11-26 02:57:57,064 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-26 02:57:57,064 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-26 02:57:57,064 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-26 02:57:57,064 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-26 02:57:57,064 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:57:30" (3/4) ... [2019-11-26 02:57:57,066 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-26 02:57:57,111 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_eba63db6-fabd-4c33-8acd-f496457fe36c/bin/utaipan/witness.graphml [2019-11-26 02:57:57,111 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-26 02:57:57,113 INFO L168 Benchmark]: Toolchain (without parser) took 26857.70 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 386.9 MB). Free memory was 952.4 MB in the beginning and 1.1 GB in the end (delta: -116.4 MB). Peak memory consumption was 270.6 MB. Max. memory is 11.5 GB. [2019-11-26 02:57:57,113 INFO L168 Benchmark]: CDTParser took 0.25 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. [2019-11-26 02:57:57,114 INFO L168 Benchmark]: CACSL2BoogieTranslator took 205.67 ms. Allocated memory is still 1.0 GB. Free memory was 952.4 MB in the beginning and 941.7 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-11-26 02:57:57,114 INFO L168 Benchmark]: Boogie Procedure Inliner took 28.97 ms. Allocated memory is still 1.0 GB. Free memory is still 941.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-26 02:57:57,114 INFO L168 Benchmark]: Boogie Preprocessor took 63.56 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 156.8 MB). Free memory was 941.7 MB in the beginning and 1.2 GB in the end (delta: -211.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 11.5 GB. [2019-11-26 02:57:57,115 INFO L168 Benchmark]: RCFGBuilder took 199.19 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 17.2 MB). Peak memory consumption was 17.2 MB. Max. memory is 11.5 GB. [2019-11-26 02:57:57,115 INFO L168 Benchmark]: TraceAbstraction took 26305.58 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 230.2 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 67.5 MB). Peak memory consumption was 297.7 MB. Max. memory is 11.5 GB. [2019-11-26 02:57:57,116 INFO L168 Benchmark]: Witness Printer took 47.21 ms. Allocated memory is still 1.4 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-26 02:57:57,118 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 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 205.67 ms. Allocated memory is still 1.0 GB. Free memory was 952.4 MB in the beginning and 941.7 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 28.97 ms. Allocated memory is still 1.0 GB. Free memory is still 941.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 63.56 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 156.8 MB). Free memory was 941.7 MB in the beginning and 1.2 GB in the end (delta: -211.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 11.5 GB. * RCFGBuilder took 199.19 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 17.2 MB). Peak memory consumption was 17.2 MB. Max. memory is 11.5 GB. * TraceAbstraction took 26305.58 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 230.2 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 67.5 MB). Peak memory consumption was 297.7 MB. Max. memory is 11.5 GB. * Witness Printer took 47.21 ms. Allocated memory is still 1.4 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 15; [L11] CALL, EXPR id(input) VAL [\old(x)=15] [L5] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L6] CALL, EXPR id(x-1) VAL [\old(x)=14] [L5] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L6] CALL, EXPR id(x-1) VAL [\old(x)=13] [L5] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L6] CALL, EXPR id(x-1) VAL [\old(x)=12] [L5] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L6] CALL, EXPR id(x-1) VAL [\old(x)=11] [L5] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L6] CALL, EXPR id(x-1) VAL [\old(x)=10] [L5] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L6] CALL, EXPR id(x-1) VAL [\old(x)=9] [L5] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L6] CALL, EXPR id(x-1) VAL [\old(x)=8] [L5] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L6] CALL, EXPR id(x-1) VAL [\old(x)=7] [L5] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L6] CALL, EXPR id(x-1) VAL [\old(x)=6] [L5] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L6] CALL, EXPR id(x-1) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] int result = id(input); [L12] COND TRUE result == 15 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 15 locations, 1 error locations. Result: UNSAFE, OverallTime: 26.2s, OverallIterations: 10, TraceHistogramMax: 16, AutomataDifference: 2.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 175 SDtfs, 409 SDslu, 1768 SDs, 0 SdLazy, 1247 SolverSat, 139 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1484 GetRequests, 1238 SyntacticMatches, 32 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 787 ImplicationChecksByTransitivity, 3.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 9 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 18.9s InterpolantComputationTime, 828 NumberOfCodeBlocks, 828 NumberOfCodeBlocksAsserted, 65 NumberOfCheckSat, 1424 ConstructedInterpolants, 0 QuantifiedInterpolants, 340048 SizeOfPredicates, 116 NumberOfNonLiveVariables, 1006 ConjunctsInSsa, 260 ConjunctsInUnsatCore, 34 InterpolantComputations, 2 PerfectInterpolantSequences, 1992/5664 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...