./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_o20.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_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_o20.c -s /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 d1286ba4e4f9d6c67aa5e4ab5d636bfd3afce4b1 ................................................................................................................................................................................................................................................................................................... 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_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_o20.c -s /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 d1286ba4e4f9d6c67aa5e4ab5d636bfd3afce4b1 ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 02:42:52,494 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-26 02:42:52,495 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-26 02:42:52,509 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-26 02:42:52,510 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-26 02:42:52,511 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-26 02:42:52,512 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-26 02:42:52,521 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-26 02:42:52,525 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-26 02:42:52,529 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-26 02:42:52,530 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-26 02:42:52,531 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-26 02:42:52,532 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-26 02:42:52,533 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-26 02:42:52,534 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-26 02:42:52,535 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-26 02:42:52,536 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-26 02:42:52,537 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-26 02:42:52,539 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-26 02:42:52,542 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-26 02:42:52,545 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-26 02:42:52,548 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-26 02:42:52,550 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-26 02:42:52,550 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-26 02:42:52,553 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-26 02:42:52,554 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-26 02:42:52,554 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-26 02:42:52,555 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-26 02:42:52,556 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-26 02:42:52,556 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-26 02:42:52,557 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-26 02:42:52,557 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-26 02:42:52,558 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-26 02:42:52,559 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-26 02:42:52,559 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-26 02:42:52,559 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-26 02:42:52,560 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-26 02:42:52,560 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-26 02:42:52,560 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-26 02:42:52,561 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-26 02:42:52,562 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-26 02:42:52,563 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2019-11-26 02:42:52,587 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-26 02:42:52,587 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-26 02:42:52,588 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-26 02:42:52,588 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-26 02:42:52,588 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-26 02:42:52,588 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-26 02:42:52,588 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-26 02:42:52,588 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-26 02:42:52,589 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-26 02:42:52,589 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-26 02:42:52,589 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-26 02:42:52,589 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-26 02:42:52,589 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-26 02:42:52,590 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-26 02:42:52,590 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-26 02:42:52,590 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-26 02:42:52,590 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-26 02:42:52,591 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-26 02:42:52,591 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-26 02:42:52,591 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-26 02:42:52,591 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-26 02:42:52,591 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-26 02:42:52,592 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-26 02:42:52,592 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-26 02:42:52,592 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-26 02:42:52,592 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-26 02:42:52,592 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-26 02:42:52,592 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-26 02:42:52,593 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-26 02:42:52,593 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-26 02:42:52,593 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-26 02:42:52,593 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-26 02:42:52,593 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-26 02:42:52,594 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-26 02:42:52,594 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-26 02:42:52,594 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-26 02:42:52,594 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-26 02:42:52,594 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_69daed03-60c6-4c71-add9-0170422da21e/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 -> d1286ba4e4f9d6c67aa5e4ab5d636bfd3afce4b1 [2019-11-26 02:42:52,771 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-26 02:42:52,788 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-26 02:42:52,791 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-26 02:42:52,794 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-26 02:42:52,795 INFO L275 PluginConnector]: CDTParser initialized [2019-11-26 02:42:52,795 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id_o20.c [2019-11-26 02:42:52,850 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/data/22c3f5329/04af2d40dcec4f08b663cbeff1494b11/FLAG8767dd447 [2019-11-26 02:42:53,250 INFO L306 CDTParser]: Found 1 translation units. [2019-11-26 02:42:53,251 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/sv-benchmarks/c/recursive-simple/id_o20.c [2019-11-26 02:42:53,255 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/data/22c3f5329/04af2d40dcec4f08b663cbeff1494b11/FLAG8767dd447 [2019-11-26 02:42:53,267 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/data/22c3f5329/04af2d40dcec4f08b663cbeff1494b11 [2019-11-26 02:42:53,269 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-26 02:42:53,270 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-26 02:42:53,271 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-26 02:42:53,271 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-26 02:42:53,274 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-26 02:42:53,275 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 02:42:53" (1/1) ... [2019-11-26 02:42:53,278 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7edc44e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53, skipping insertion in model container [2019-11-26 02:42:53,278 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 02:42:53" (1/1) ... [2019-11-26 02:42:53,284 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-26 02:42:53,298 INFO L179 MainTranslator]: Built tables and reachable declarations [2019-11-26 02:42:53,425 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-26 02:42:53,429 INFO L201 MainTranslator]: Completed pre-run [2019-11-26 02:42:53,501 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-26 02:42:53,513 INFO L205 MainTranslator]: Completed translation [2019-11-26 02:42:53,514 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53 WrapperNode [2019-11-26 02:42:53,514 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-26 02:42:53,515 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-26 02:42:53,515 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-26 02:42:53,515 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-26 02:42:53,523 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53" (1/1) ... [2019-11-26 02:42:53,527 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53" (1/1) ... [2019-11-26 02:42:53,543 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-26 02:42:53,544 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-26 02:42:53,544 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-26 02:42:53,544 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-26 02:42:53,552 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53" (1/1) ... [2019-11-26 02:42:53,552 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53" (1/1) ... [2019-11-26 02:42:53,553 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53" (1/1) ... [2019-11-26 02:42:53,553 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53" (1/1) ... [2019-11-26 02:42:53,555 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53" (1/1) ... [2019-11-26 02:42:53,557 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53" (1/1) ... [2019-11-26 02:42:53,557 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53" (1/1) ... [2019-11-26 02:42:53,558 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-26 02:42:53,559 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-26 02:42:53,559 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-26 02:42:53,559 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-26 02:42:53,560 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:42:53,619 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-26 02:42:53,620 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-26 02:42:53,620 INFO L130 BoogieDeclarations]: Found specification of procedure id [2019-11-26 02:42:53,620 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2019-11-26 02:42:53,787 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-26 02:42:53,787 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-26 02:42:53,788 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:42:53 BoogieIcfgContainer [2019-11-26 02:42:53,788 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-26 02:42:53,789 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-26 02:42:53,789 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-26 02:42:53,792 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-26 02:42:53,792 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 02:42:53" (1/3) ... [2019-11-26 02:42:53,793 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3819bffb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 02:42:53, skipping insertion in model container [2019-11-26 02:42:53,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:53" (2/3) ... [2019-11-26 02:42:53,793 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3819bffb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 02:42:53, skipping insertion in model container [2019-11-26 02:42:53,793 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:42:53" (3/3) ... [2019-11-26 02:42:53,794 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o20.c [2019-11-26 02:42:53,805 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-26 02:42:53,811 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-26 02:42:53,823 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-26 02:42:53,849 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-26 02:42:53,849 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-26 02:42:53,849 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-26 02:42:53,849 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-26 02:42:53,849 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-26 02:42:53,850 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-26 02:42:53,850 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-26 02:42:53,850 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-26 02:42:53,870 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states. [2019-11-26 02:42:53,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-26 02:42:53,875 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:42:53,876 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:42:53,877 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:42:53,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:42:53,883 INFO L82 PathProgramCache]: Analyzing trace with hash 389977641, now seen corresponding path program 1 times [2019-11-26 02:42:53,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-26 02:42:53,892 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918705843] [2019-11-26 02:42:53,892 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-26 02:42:53,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:42:54,214 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 02:42:54,215 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918705843] [2019-11-26 02:42:54,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-26 02:42:54,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-26 02:42:54,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217354748] [2019-11-26 02:42:54,221 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-26 02:42:54,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-26 02:42:54,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-26 02:42:54,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-26 02:42:54,232 INFO L87 Difference]: Start difference. First operand 14 states. Second operand 5 states. [2019-11-26 02:42:54,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:42:54,289 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2019-11-26 02:42:54,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-26 02:42:54,291 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2019-11-26 02:42:54,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:42:54,301 INFO L225 Difference]: With dead ends: 24 [2019-11-26 02:42:54,301 INFO L226 Difference]: Without dead ends: 14 [2019-11-26 02:42:54,304 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-26 02:42:54,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-26 02:42:54,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-26 02:42:54,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-26 02:42:54,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-11-26 02:42:54,340 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2019-11-26 02:42:54,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:42:54,341 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-11-26 02:42:54,341 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-26 02:42:54,341 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-11-26 02:42:54,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-26 02:42:54,343 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:42:54,343 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:42:54,343 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:42:54,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:42:54,343 INFO L82 PathProgramCache]: Analyzing trace with hash -881029229, now seen corresponding path program 1 times [2019-11-26 02:42:54,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-26 02:42:54,344 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338264639] [2019-11-26 02:42:54,344 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-26 02:42:54,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:42:54,492 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 02:42:54,493 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338264639] [2019-11-26 02:42:54,493 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1971704928] [2019-11-26 02:42:54,493 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:42:54,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:42:54,532 INFO L255 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-26 02:42:54,537 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:42:54,589 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 02:42:54,590 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:42:54,852 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 02:42:54,853 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2125722043] [2019-11-26 02:42:54,887 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2019-11-26 02:42:54,887 INFO L166 IcfgInterpreter]: Building call graph [2019-11-26 02:42:54,893 FATAL L310 FreeRefinementEngine]: Exception during interpolant generation: IllegalArgumentException [2019-11-26 02:42:55,098 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-26 02:42:55,098 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 02:42:55,102 INFO L168 Benchmark]: Toolchain (without parser) took 1831.35 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.1 MB). Free memory was 943.4 MB in the beginning and 1.0 GB in the end (delta: -101.8 MB). Peak memory consumption was 30.4 MB. Max. memory is 11.5 GB. [2019-11-26 02:42:55,103 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 962.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-26 02:42:55,105 INFO L168 Benchmark]: CACSL2BoogieTranslator took 243.09 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.1 MB). Free memory was 943.4 MB in the beginning and 1.1 GB in the end (delta: -183.7 MB). Peak memory consumption was 22.8 MB. Max. memory is 11.5 GB. [2019-11-26 02:42:55,105 INFO L168 Benchmark]: Boogie Procedure Inliner took 28.83 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 02:42:55,106 INFO L168 Benchmark]: Boogie Preprocessor took 15.00 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 02:42:55,107 INFO L168 Benchmark]: RCFGBuilder took 229.36 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: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 11.5 GB. [2019-11-26 02:42:55,107 INFO L168 Benchmark]: TraceAbstraction took 1311.30 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: 64.9 MB). Peak memory consumption was 64.9 MB. Max. memory is 11.5 GB. [2019-11-26 02:42:55,116 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 962.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 243.09 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.1 MB). Free memory was 943.4 MB in the beginning and 1.1 GB in the end (delta: -183.7 MB). Peak memory consumption was 22.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 28.83 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 15.00 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 229.36 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: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1311.30 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: 64.9 MB). Peak memory consumption was 64.9 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 02:42:57,034 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-26 02:42:57,035 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-26 02:42:57,051 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-26 02:42:57,052 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-26 02:42:57,053 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-26 02:42:57,055 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-26 02:42:57,056 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-26 02:42:57,058 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-26 02:42:57,059 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-26 02:42:57,060 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-26 02:42:57,061 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-26 02:42:57,062 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-26 02:42:57,062 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-26 02:42:57,063 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-26 02:42:57,065 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-26 02:42:57,065 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-26 02:42:57,066 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-26 02:42:57,068 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-26 02:42:57,070 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-26 02:42:57,072 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-26 02:42:57,073 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-26 02:42:57,074 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-26 02:42:57,075 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-26 02:42:57,078 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-26 02:42:57,078 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-26 02:42:57,078 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-26 02:42:57,079 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-26 02:42:57,080 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-26 02:42:57,081 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-26 02:42:57,081 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-26 02:42:57,082 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-26 02:42:57,083 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-26 02:42:57,084 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-26 02:42:57,085 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-26 02:42:57,085 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-26 02:42:57,086 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-26 02:42:57,086 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-26 02:42:57,086 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-26 02:42:57,088 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-26 02:42:57,088 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-26 02:42:57,089 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2019-11-26 02:42:57,105 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-26 02:42:57,106 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-26 02:42:57,106 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-26 02:42:57,107 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-26 02:42:57,107 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-26 02:42:57,107 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-26 02:42:57,107 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-26 02:42:57,108 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-26 02:42:57,108 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-26 02:42:57,109 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-26 02:42:57,109 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-26 02:42:57,109 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-26 02:42:57,109 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-26 02:42:57,110 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-26 02:42:57,110 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-26 02:42:57,110 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-26 02:42:57,110 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-26 02:42:57,111 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2019-11-26 02:42:57,111 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2019-11-26 02:42:57,111 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-26 02:42:57,111 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-26 02:42:57,112 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-26 02:42:57,112 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-26 02:42:57,112 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-26 02:42:57,112 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-26 02:42:57,113 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-26 02:42:57,113 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-26 02:42:57,113 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-26 02:42:57,113 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-26 02:42:57,114 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-26 02:42:57,114 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-26 02:42:57,114 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2019-11-26 02:42:57,114 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2019-11-26 02:42:57,115 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-26 02:42:57,115 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-26 02:42:57,115 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_69daed03-60c6-4c71-add9-0170422da21e/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 -> d1286ba4e4f9d6c67aa5e4ab5d636bfd3afce4b1 [2019-11-26 02:42:57,373 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-26 02:42:57,389 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-26 02:42:57,393 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-26 02:42:57,394 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-26 02:42:57,395 INFO L275 PluginConnector]: CDTParser initialized [2019-11-26 02:42:57,395 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id_o20.c [2019-11-26 02:42:57,454 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/data/e042c91ae/da288af739cd48a480de4b2635107157/FLAGe431121c4 [2019-11-26 02:42:57,836 INFO L306 CDTParser]: Found 1 translation units. [2019-11-26 02:42:57,836 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/sv-benchmarks/c/recursive-simple/id_o20.c [2019-11-26 02:42:57,841 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/data/e042c91ae/da288af739cd48a480de4b2635107157/FLAGe431121c4 [2019-11-26 02:42:58,268 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/data/e042c91ae/da288af739cd48a480de4b2635107157 [2019-11-26 02:42:58,270 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-26 02:42:58,271 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-26 02:42:58,273 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-26 02:42:58,273 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-26 02:42:58,276 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-26 02:42:58,277 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 02:42:58" (1/1) ... [2019-11-26 02:42:58,279 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51526034 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58, skipping insertion in model container [2019-11-26 02:42:58,280 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 02:42:58" (1/1) ... [2019-11-26 02:42:58,286 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-26 02:42:58,300 INFO L179 MainTranslator]: Built tables and reachable declarations [2019-11-26 02:42:58,490 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-26 02:42:58,500 INFO L201 MainTranslator]: Completed pre-run [2019-11-26 02:42:58,515 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-26 02:42:58,529 INFO L205 MainTranslator]: Completed translation [2019-11-26 02:42:58,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58 WrapperNode [2019-11-26 02:42:58,529 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-26 02:42:58,530 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-26 02:42:58,530 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-26 02:42:58,530 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-26 02:42:58,538 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58" (1/1) ... [2019-11-26 02:42:58,545 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58" (1/1) ... [2019-11-26 02:42:58,557 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-26 02:42:58,557 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-26 02:42:58,558 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-26 02:42:58,558 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-26 02:42:58,612 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58" (1/1) ... [2019-11-26 02:42:58,612 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58" (1/1) ... [2019-11-26 02:42:58,613 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58" (1/1) ... [2019-11-26 02:42:58,614 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58" (1/1) ... [2019-11-26 02:42:58,618 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58" (1/1) ... [2019-11-26 02:42:58,620 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58" (1/1) ... [2019-11-26 02:42:58,621 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58" (1/1) ... [2019-11-26 02:42:58,623 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-26 02:42:58,624 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-26 02:42:58,624 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-26 02:42:58,624 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-26 02:42:58,625 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:42:58,678 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-26 02:42:58,678 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-26 02:42:58,678 INFO L130 BoogieDeclarations]: Found specification of procedure id [2019-11-26 02:42:58,679 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2019-11-26 02:42:58,821 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-26 02:42:58,821 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-26 02:42:58,822 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:42:58 BoogieIcfgContainer [2019-11-26 02:42:58,823 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-26 02:42:58,824 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-26 02:42:58,824 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-26 02:42:58,826 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-26 02:42:58,826 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 02:42:58" (1/3) ... [2019-11-26 02:42:58,827 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7875a290 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 02:42:58, skipping insertion in model container [2019-11-26 02:42:58,827 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:42:58" (2/3) ... [2019-11-26 02:42:58,827 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7875a290 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 02:42:58, skipping insertion in model container [2019-11-26 02:42:58,828 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:42:58" (3/3) ... [2019-11-26 02:42:58,829 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o20.c [2019-11-26 02:42:58,837 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-26 02:42:58,842 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-26 02:42:58,849 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-26 02:42:58,870 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-26 02:42:58,870 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-26 02:42:58,870 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-26 02:42:58,870 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-26 02:42:58,870 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-26 02:42:58,870 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-26 02:42:58,871 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-26 02:42:58,871 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-26 02:42:58,885 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2019-11-26 02:42:58,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-26 02:42:58,890 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:42:58,891 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:42:58,891 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:42:58,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:42:58,895 INFO L82 PathProgramCache]: Analyzing trace with hash 389977641, now seen corresponding path program 1 times [2019-11-26 02:42:58,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:42:58,902 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1671379011] [2019-11-26 02:42:58,902 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:42:58,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:42:58,958 INFO L255 TraceCheckSpWp]: Trace formula consists of 14 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-26 02:42:58,962 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:42:59,029 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 02:42:59,029 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:42:59,150 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 02:42:59,150 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1671379011] [2019-11-26 02:42:59,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-26 02:42:59,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2019-11-26 02:42:59,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858722575] [2019-11-26 02:42:59,156 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-26 02:42:59,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:42:59,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-26 02:42:59,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-11-26 02:42:59,171 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 8 states. [2019-11-26 02:42:59,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:42:59,231 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2019-11-26 02:42:59,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-26 02:42:59,234 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2019-11-26 02:42:59,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:42:59,245 INFO L225 Difference]: With dead ends: 27 [2019-11-26 02:42:59,246 INFO L226 Difference]: Without dead ends: 14 [2019-11-26 02:42:59,254 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-11-26 02:42:59,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-26 02:42:59,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-26 02:42:59,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-26 02:42:59,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-11-26 02:42:59,292 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2019-11-26 02:42:59,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:42:59,292 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-11-26 02:42:59,292 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-26 02:42:59,293 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-11-26 02:42:59,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-26 02:42:59,295 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:42:59,295 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:42:59,496 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:42:59,497 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:42:59,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:42:59,497 INFO L82 PathProgramCache]: Analyzing trace with hash -881029229, now seen corresponding path program 1 times [2019-11-26 02:42:59,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:42:59,498 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [893010185] [2019-11-26 02:42:59,498 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:42:59,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:42:59,529 INFO L255 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-26 02:42:59,531 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:42:59,607 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 02:42:59,607 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:42:59,780 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 02:42:59,780 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [893010185] [2019-11-26 02:42:59,780 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246454469] [2019-11-26 02:42:59,781 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:42:59,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:42:59,823 INFO L255 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-26 02:42:59,825 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:42:59,830 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 02:42:59,830 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:42:59,917 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 02:42:59,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:42:59,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7] total 12 [2019-11-26 02:42:59,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636150224] [2019-11-26 02:42:59,919 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-26 02:42:59,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:42:59,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-26 02:42:59,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2019-11-26 02:42:59,921 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 12 states. [2019-11-26 02:42:59,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:42:59,968 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2019-11-26 02:42:59,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-26 02:42:59,968 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2019-11-26 02:42:59,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:42:59,969 INFO L225 Difference]: With dead ends: 26 [2019-11-26 02:42:59,969 INFO L226 Difference]: Without dead ends: 20 [2019-11-26 02:42:59,971 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2019-11-26 02:42:59,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-26 02:42:59,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-26 02:42:59,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-26 02:42:59,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-11-26 02:42:59,976 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2019-11-26 02:42:59,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:42:59,977 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-11-26 02:42:59,977 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-26 02:42:59,977 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-11-26 02:42:59,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-26 02:42:59,978 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:42:59,978 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:43:00,385 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 02:43:00,387 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:43:00,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:43:00,388 INFO L82 PathProgramCache]: Analyzing trace with hash -28473709, now seen corresponding path program 2 times [2019-11-26 02:43:00,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:43:00,388 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [261657880] [2019-11-26 02:43:00,389 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:43:00,426 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-26 02:43:00,427 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:43:00,428 INFO L255 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-26 02:43:00,430 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:43:00,568 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 02:43:00,569 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:43:01,041 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 02:43:01,041 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [261657880] [2019-11-26 02:43:01,042 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579129674] [2019-11-26 02:43:01,042 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:43:01,090 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-26 02:43:01,090 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:43:01,092 INFO L255 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-26 02:43:01,094 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:43:01,102 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 02:43:01,102 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:43:01,323 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 02:43:01,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:43:01,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 20 [2019-11-26 02:43:01,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633137946] [2019-11-26 02:43:01,328 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-26 02:43:01,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:43:01,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-26 02:43:01,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2019-11-26 02:43:01,332 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 20 states. [2019-11-26 02:43:01,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:43:01,549 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2019-11-26 02:43:01,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-26 02:43:01,550 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2019-11-26 02:43:01,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:43:01,551 INFO L225 Difference]: With dead ends: 38 [2019-11-26 02:43:01,551 INFO L226 Difference]: Without dead ends: 32 [2019-11-26 02:43:01,552 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2019-11-26 02:43:01,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-26 02:43:01,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-11-26 02:43:01,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-26 02:43:01,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2019-11-26 02:43:01,560 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 27 [2019-11-26 02:43:01,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:43:01,560 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2019-11-26 02:43:01,560 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-26 02:43:01,560 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2019-11-26 02:43:01,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-26 02:43:01,562 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:43:01,562 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:43:01,963 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 02:43:01,963 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:43:01,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:43:01,964 INFO L82 PathProgramCache]: Analyzing trace with hash -247823213, now seen corresponding path program 3 times [2019-11-26 02:43:01,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:43:01,964 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [77625006] [2019-11-26 02:43:01,965 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:43:02,066 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2019-11-26 02:43:02,066 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:43:02,068 INFO L255 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-26 02:43:02,071 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:43:02,338 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2019-11-26 02:43:02,338 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:43:03,611 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2019-11-26 02:43:03,611 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [77625006] [2019-11-26 02:43:03,611 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748123046] [2019-11-26 02:43:03,611 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:43:03,674 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2019-11-26 02:43:03,675 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:43:03,677 INFO L255 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-26 02:43:03,680 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:43:03,690 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2019-11-26 02:43:03,690 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:43:04,417 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2019-11-26 02:43:04,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:43:04,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19] total 36 [2019-11-26 02:43:04,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581929628] [2019-11-26 02:43:04,419 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-26 02:43:04,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:43:04,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-26 02:43:04,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1076, Unknown=0, NotChecked=0, Total=1260 [2019-11-26 02:43:04,420 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 36 states. [2019-11-26 02:43:05,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:43:05,190 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2019-11-26 02:43:05,191 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-26 02:43:05,191 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 51 [2019-11-26 02:43:05,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:43:05,193 INFO L225 Difference]: With dead ends: 62 [2019-11-26 02:43:05,193 INFO L226 Difference]: Without dead ends: 56 [2019-11-26 02:43:05,195 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 165 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=382, Invalid=1874, Unknown=0, NotChecked=0, Total=2256 [2019-11-26 02:43:05,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-26 02:43:05,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-11-26 02:43:05,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-26 02:43:05,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2019-11-26 02:43:05,205 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 51 [2019-11-26 02:43:05,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:43:05,206 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2019-11-26 02:43:05,206 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-26 02:43:05,206 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2019-11-26 02:43:05,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-11-26 02:43:05,209 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:43:05,209 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:43:05,611 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 02:43:05,612 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:43:05,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:43:05,612 INFO L82 PathProgramCache]: Analyzing trace with hash -948911981, now seen corresponding path program 4 times [2019-11-26 02:43:05,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:43:05,613 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [827124701] [2019-11-26 02:43:05,613 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:43:05,690 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-26 02:43:05,691 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:43:05,692 INFO L255 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 34 conjunts are in the unsatisfiable core [2019-11-26 02:43:05,706 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:43:06,425 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2019-11-26 02:43:06,425 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:43:10,210 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2019-11-26 02:43:10,211 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [827124701] [2019-11-26 02:43:10,211 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [219962779] [2019-11-26 02:43:10,211 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:43:10,272 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-26 02:43:10,273 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-26 02:43:10,276 INFO L255 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 34 conjunts are in the unsatisfiable core [2019-11-26 02:43:10,278 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-26 02:43:10,402 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2019-11-26 02:43:10,402 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-26 02:43:12,805 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2019-11-26 02:43:12,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-26 02:43:12,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35] total 68 [2019-11-26 02:43:12,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929705974] [2019-11-26 02:43:12,807 INFO L442 AbstractCegarLoop]: Interpolant automaton has 68 states [2019-11-26 02:43:12,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-11-26 02:43:12,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2019-11-26 02:43:12,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=3961, Unknown=0, NotChecked=0, Total=4556 [2019-11-26 02:43:12,811 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand 68 states. [2019-11-26 02:43:15,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:43:15,393 INFO L93 Difference]: Finished difference Result 110 states and 126 transitions. [2019-11-26 02:43:15,393 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2019-11-26 02:43:15,394 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 99 [2019-11-26 02:43:15,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:43:15,401 INFO L225 Difference]: With dead ends: 110 [2019-11-26 02:43:15,403 INFO L226 Difference]: Without dead ends: 104 [2019-11-26 02:43:15,406 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 317 SyntacticMatches, 9 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1186 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1287, Invalid=7833, Unknown=0, NotChecked=0, Total=9120 [2019-11-26 02:43:15,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-11-26 02:43:15,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2019-11-26 02:43:15,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-11-26 02:43:15,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2019-11-26 02:43:15,429 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 99 [2019-11-26 02:43:15,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:43:15,432 INFO L462 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2019-11-26 02:43:15,432 INFO L463 AbstractCegarLoop]: Interpolant automaton has 68 states. [2019-11-26 02:43:15,433 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2019-11-26 02:43:15,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2019-11-26 02:43:15,437 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:43:15,438 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:43:15,840 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 02:43:15,840 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:43:15,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:43:15,840 INFO L82 PathProgramCache]: Analyzing trace with hash -1280276695, now seen corresponding path program 5 times [2019-11-26 02:43:15,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy WALRUS [2019-11-26 02:43:15,841 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1664330567] [2019-11-26 02:43:15,841 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/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 02:43:16,110 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2019-11-26 02:43:16,110 INFO L250 tOrderPrioritization]: Conjunction of SSA is sat [2019-11-26 02:43:16,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-26 02:43:16,310 INFO L174 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2019-11-26 02:43:16,311 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-26 02:43:16,511 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-26 02:43:16,549 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.11 02:43:16 BoogieIcfgContainer [2019-11-26 02:43:16,551 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-26 02:43:16,552 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-26 02:43:16,552 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-26 02:43:16,552 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-26 02:43:16,553 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:42:58" (3/4) ... [2019-11-26 02:43:16,555 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-26 02:43:16,637 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_69daed03-60c6-4c71-add9-0170422da21e/bin/utaipan/witness.graphml [2019-11-26 02:43:16,637 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-26 02:43:16,639 INFO L168 Benchmark]: Toolchain (without parser) took 18367.16 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 339.2 MB). Free memory was 955.1 MB in the beginning and 1.1 GB in the end (delta: -147.2 MB). Peak memory consumption was 192.1 MB. Max. memory is 11.5 GB. [2019-11-26 02:43:16,639 INFO L168 Benchmark]: CDTParser took 0.23 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 02:43:16,640 INFO L168 Benchmark]: CACSL2BoogieTranslator took 256.80 ms. Allocated memory is still 1.0 GB. Free memory was 955.1 MB in the beginning and 944.3 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-11-26 02:43:16,641 INFO L168 Benchmark]: Boogie Procedure Inliner took 27.26 ms. Allocated memory is still 1.0 GB. Free memory is still 944.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-26 02:43:16,641 INFO L168 Benchmark]: Boogie Preprocessor took 65.85 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 153.6 MB). Free memory was 944.3 MB in the beginning and 1.2 GB in the end (delta: -206.1 MB). Peak memory consumption was 9.9 MB. Max. memory is 11.5 GB. [2019-11-26 02:43:16,641 INFO L168 Benchmark]: RCFGBuilder took 199.09 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 02:43:16,642 INFO L168 Benchmark]: TraceAbstraction took 17727.85 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 185.6 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 31.0 MB). Peak memory consumption was 216.6 MB. Max. memory is 11.5 GB. [2019-11-26 02:43:16,642 INFO L168 Benchmark]: Witness Printer took 85.44 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 02:43:16,647 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 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 256.80 ms. Allocated memory is still 1.0 GB. Free memory was 955.1 MB in the beginning and 944.3 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 27.26 ms. Allocated memory is still 1.0 GB. Free memory is still 944.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 65.85 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 153.6 MB). Free memory was 944.3 MB in the beginning and 1.2 GB in the end (delta: -206.1 MB). Peak memory consumption was 9.9 MB. Max. memory is 11.5 GB. * RCFGBuilder took 199.09 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 17727.85 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 185.6 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 31.0 MB). Peak memory consumption was 216.6 MB. Max. memory is 11.5 GB. * Witness Printer took 85.44 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] unsigned int input = __VERIFIER_nondet_uint(); [L11] CALL, EXPR id(input) VAL [\old(x)=20] [L5] COND FALSE !(x==0) VAL [\old(x)=20, x=20] [L6] CALL, EXPR id(x-1) VAL [\old(x)=19] [L5] COND FALSE !(x==0) VAL [\old(x)=19, x=19] [L6] CALL, EXPR id(x-1) VAL [\old(x)=18] [L5] COND FALSE !(x==0) VAL [\old(x)=18, x=18] [L6] CALL, EXPR id(x-1) VAL [\old(x)=17] [L5] COND FALSE !(x==0) VAL [\old(x)=17, x=17] [L6] CALL, EXPR id(x-1) VAL [\old(x)=16] [L5] COND FALSE !(x==0) VAL [\old(x)=16, x=16] [L6] CALL, EXPR id(x-1) 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; [L6] RET, EXPR id(x-1) VAL [\old(x)=16, id(x-1)=15, x=16] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=17, id(x-1)=16, x=17] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=18, id(x-1)=17, x=18] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=19, id(x-1)=18, x=19] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=20, id(x-1)=19, x=20] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] unsigned int result = id(input); [L12] COND TRUE result == 20 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 15 locations, 1 error locations. Result: UNSAFE, OverallTime: 17.6s, OverallIterations: 6, TraceHistogramMax: 21, AutomataDifference: 3.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 116 SDtfs, 8 SDslu, 1991 SDs, 0 SdLazy, 1027 SolverSat, 52 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 812 GetRequests, 624 SyntacticMatches, 10 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1394 ImplicationChecksByTransitivity, 6.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=104occurred in iteration=5, 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, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 10.7s InterpolantComputationTime, 522 NumberOfCodeBlocks, 522 NumberOfCodeBlocksAsserted, 46 NumberOfCheckSat, 768 ConstructedInterpolants, 0 QuantifiedInterpolants, 152624 SizeOfPredicates, 9 NumberOfNonLiveVariables, 542 ConjunctsInSsa, 140 ConjunctsInUnsatCore, 18 InterpolantComputations, 2 PerfectInterpolantSequences, 1756/3512 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...