./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/Ackermann01-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann01-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7cce1369ae77ba12caf55c599bb062630d3f3fd2 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2021-10-11 02:22:36,700 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-11 02:22:36,704 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-11 02:22:36,756 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-11 02:22:36,757 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-11 02:22:36,759 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-11 02:22:36,761 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-11 02:22:36,764 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-11 02:22:36,766 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-11 02:22:36,767 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-11 02:22:36,769 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-11 02:22:36,770 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-11 02:22:36,771 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-11 02:22:36,780 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-11 02:22:36,782 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-11 02:22:36,784 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-11 02:22:36,787 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-11 02:22:36,790 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-11 02:22:36,795 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-11 02:22:36,801 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-11 02:22:36,807 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-11 02:22:36,809 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-11 02:22:36,814 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-11 02:22:36,815 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-11 02:22:36,823 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-11 02:22:36,824 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-11 02:22:36,824 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-11 02:22:36,826 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-11 02:22:36,827 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-11 02:22:36,829 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-11 02:22:36,830 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-11 02:22:36,831 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-11 02:22:36,834 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-11 02:22:36,835 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-11 02:22:36,837 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-11 02:22:36,837 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-11 02:22:36,838 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-11 02:22:36,839 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-11 02:22:36,839 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-11 02:22:36,840 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-11 02:22:36,841 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-11 02:22:36,844 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-11 02:22:36,894 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-11 02:22:36,894 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-11 02:22:36,896 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-11 02:22:36,896 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-11 02:22:36,898 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-11 02:22:36,898 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-11 02:22:36,899 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-11 02:22:36,899 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-11 02:22:36,899 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-11 02:22:36,899 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-11 02:22:36,901 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-11 02:22:36,901 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-11 02:22:36,902 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-11 02:22:36,902 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-11 02:22:36,902 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-11 02:22:36,903 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-11 02:22:36,904 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-11 02:22:36,904 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-11 02:22:36,904 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-11 02:22:36,905 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-11 02:22:36,905 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-11 02:22:36,905 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-11 02:22:36,905 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-11 02:22:36,906 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-11 02:22:36,906 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-11 02:22:36,906 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-11 02:22:36,907 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-11 02:22:36,907 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-11 02:22:36,907 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-11 02:22:36,909 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-11 02:22:36,910 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-11 02:22:36,910 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-11 02:22:36,911 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-11 02:22:36,911 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-11 02:22:36,911 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-11 02:22:36,911 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-11 02:22:36,912 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-11 02:22:36,912 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-11 02:22:36,912 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-11 02:22:36,913 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7cce1369ae77ba12caf55c599bb062630d3f3fd2 [2021-10-11 02:22:37,284 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-11 02:22:37,328 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-11 02:22:37,331 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-11 02:22:37,336 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-11 02:22:37,337 INFO L275 PluginConnector]: CDTParser initialized [2021-10-11 02:22:37,338 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/../../sv-benchmarks/c/recursive/Ackermann01-2.c [2021-10-11 02:22:37,440 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/data/ee4c583c6/b185a8feeb5f47d8b90f5841d974143f/FLAG8dbdd23fc [2021-10-11 02:22:38,016 INFO L306 CDTParser]: Found 1 translation units. [2021-10-11 02:22:38,017 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/sv-benchmarks/c/recursive/Ackermann01-2.c [2021-10-11 02:22:38,031 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/data/ee4c583c6/b185a8feeb5f47d8b90f5841d974143f/FLAG8dbdd23fc [2021-10-11 02:22:38,395 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/data/ee4c583c6/b185a8feeb5f47d8b90f5841d974143f [2021-10-11 02:22:38,397 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-11 02:22:38,398 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-11 02:22:38,400 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-11 02:22:38,401 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-11 02:22:38,404 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-11 02:22:38,405 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:22:38" (1/1) ... [2021-10-11 02:22:38,408 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ea379b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38, skipping insertion in model container [2021-10-11 02:22:38,408 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 02:22:38" (1/1) ... [2021-10-11 02:22:38,415 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-11 02:22:38,429 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-11 02:22:38,617 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/sv-benchmarks/c/recursive/Ackermann01-2.c[1234,1247] [2021-10-11 02:22:38,640 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:22:38,651 INFO L203 MainTranslator]: Completed pre-run [2021-10-11 02:22:38,669 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/sv-benchmarks/c/recursive/Ackermann01-2.c[1234,1247] [2021-10-11 02:22:38,670 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 02:22:38,685 INFO L208 MainTranslator]: Completed translation [2021-10-11 02:22:38,686 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38 WrapperNode [2021-10-11 02:22:38,686 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-11 02:22:38,687 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-11 02:22:38,687 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-11 02:22:38,688 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-11 02:22:38,699 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38" (1/1) ... [2021-10-11 02:22:38,707 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38" (1/1) ... [2021-10-11 02:22:38,726 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-11 02:22:38,728 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-11 02:22:38,728 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-11 02:22:38,729 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-11 02:22:38,737 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38" (1/1) ... [2021-10-11 02:22:38,738 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38" (1/1) ... [2021-10-11 02:22:38,748 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38" (1/1) ... [2021-10-11 02:22:38,749 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38" (1/1) ... [2021-10-11 02:22:38,754 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38" (1/1) ... [2021-10-11 02:22:38,760 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38" (1/1) ... [2021-10-11 02:22:38,762 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38" (1/1) ... [2021-10-11 02:22:38,764 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-11 02:22:38,767 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-11 02:22:38,767 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-11 02:22:38,767 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-11 02:22:38,768 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38" (1/1) ... No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:22:38,854 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-11 02:22:38,854 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-11 02:22:38,855 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2021-10-11 02:22:38,855 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2021-10-11 02:22:38,855 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-11 02:22:38,855 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-11 02:22:39,282 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-11 02:22:39,282 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-11 02:22:39,285 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:22:39 BoogieIcfgContainer [2021-10-11 02:22:39,285 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-11 02:22:39,287 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-11 02:22:39,287 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-11 02:22:39,294 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-11 02:22:39,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.10 02:22:38" (1/3) ... [2021-10-11 02:22:39,295 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ee63edd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:22:39, skipping insertion in model container [2021-10-11 02:22:39,295 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 02:22:38" (2/3) ... [2021-10-11 02:22:39,295 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ee63edd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 02:22:39, skipping insertion in model container [2021-10-11 02:22:39,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:22:39" (3/3) ... [2021-10-11 02:22:39,297 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann01-2.c [2021-10-11 02:22:39,325 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-11 02:22:39,328 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-10-11 02:22:39,338 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-11 02:22:39,377 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-10-11 02:22:39,377 INFO L378 AbstractCegarLoop]: Hoare is true [2021-10-11 02:22:39,378 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-10-11 02:22:39,378 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-10-11 02:22:39,378 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-10-11 02:22:39,378 INFO L382 AbstractCegarLoop]: Difference is false [2021-10-11 02:22:39,378 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-10-11 02:22:39,378 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-10-11 02:22:39,399 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2021-10-11 02:22:39,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-11 02:22:39,405 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:22:39,406 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:22:39,406 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:22:39,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:22:39,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1538870455, now seen corresponding path program 1 times [2021-10-11 02:22:39,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:22:39,423 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [235024847] [2021-10-11 02:22:39,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:22:39,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:22:39,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 02:22:39,758 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [235024847] [2021-10-11 02:22:39,759 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:22:39,759 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-11 02:22:39,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510658542] [2021-10-11 02:22:39,794 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-10-11 02:22:39,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:22:39,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-11 02:22:39,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-10-11 02:22:39,841 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 7 states. [2021-10-11 02:22:40,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:22:40,098 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-10-11 02:22:40,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-11 02:22:40,101 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2021-10-11 02:22:40,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:22:40,115 INFO L225 Difference]: With dead ends: 33 [2021-10-11 02:22:40,115 INFO L226 Difference]: Without dead ends: 21 [2021-10-11 02:22:40,118 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-10-11 02:22:40,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-10-11 02:22:40,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-10-11 02:22:40,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2021-10-11 02:22:40,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2021-10-11 02:22:40,175 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 11 [2021-10-11 02:22:40,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:22:40,176 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2021-10-11 02:22:40,176 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-10-11 02:22:40,176 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2021-10-11 02:22:40,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-11 02:22:40,179 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:22:40,179 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:22:40,180 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-11 02:22:40,180 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:22:40,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:22:40,183 INFO L82 PathProgramCache]: Analyzing trace with hash -108557995, now seen corresponding path program 1 times [2021-10-11 02:22:40,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:22:40,184 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501575505] [2021-10-11 02:22:40,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:22:40,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:22:40,357 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-11 02:22:40,358 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501575505] [2021-10-11 02:22:40,358 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 02:22:40,359 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-10-11 02:22:40,359 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585025276] [2021-10-11 02:22:40,360 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-10-11 02:22:40,361 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:22:40,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-11 02:22:40,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-10-11 02:22:40,363 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand 8 states. [2021-10-11 02:22:40,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:22:40,607 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2021-10-11 02:22:40,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-11 02:22:40,608 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2021-10-11 02:22:40,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:22:40,609 INFO L225 Difference]: With dead ends: 28 [2021-10-11 02:22:40,609 INFO L226 Difference]: Without dead ends: 24 [2021-10-11 02:22:40,610 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-10-11 02:22:40,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-10-11 02:22:40,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2021-10-11 02:22:40,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2021-10-11 02:22:40,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2021-10-11 02:22:40,633 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 18 [2021-10-11 02:22:40,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:22:40,634 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2021-10-11 02:22:40,634 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-10-11 02:22:40,634 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2021-10-11 02:22:40,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-11 02:22:40,636 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:22:40,636 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:22:40,636 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-11 02:22:40,636 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:22:40,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:22:40,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1474991098, now seen corresponding path program 1 times [2021-10-11 02:22:40,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:22:40,638 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455413336] [2021-10-11 02:22:40,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:22:40,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:22:40,752 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-11 02:22:40,752 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455413336] [2021-10-11 02:22:40,753 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162321148] [2021-10-11 02:22:40,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:22:40,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:22:40,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-11 02:22:40,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:22:40,908 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-11 02:22:40,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:22:41,207 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-11 02:22:41,208 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1002344765] [2021-10-11 02:22:41,231 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-10-11 02:22:41,231 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:22:41,237 FATAL L? ?]: Ignoring 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:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:22:41,240 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:22:41,240 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2021-10-11 02:22:41,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774982789] [2021-10-11 02:22:41,241 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-10-11 02:22:41,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:22:41,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-11 02:22:41,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-10-11 02:22:41,243 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand 9 states. [2021-10-11 02:22:41,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:22:41,423 INFO L93 Difference]: Finished difference Result 49 states and 77 transitions. [2021-10-11 02:22:41,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-11 02:22:41,424 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2021-10-11 02:22:41,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:22:41,426 INFO L225 Difference]: With dead ends: 49 [2021-10-11 02:22:41,426 INFO L226 Difference]: Without dead ends: 24 [2021-10-11 02:22:41,428 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2021-10-11 02:22:41,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-10-11 02:22:41,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-10-11 02:22:41,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2021-10-11 02:22:41,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 31 transitions. [2021-10-11 02:22:41,436 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 31 transitions. Word has length 24 [2021-10-11 02:22:41,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:22:41,437 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 31 transitions. [2021-10-11 02:22:41,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-10-11 02:22:41,437 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 31 transitions. [2021-10-11 02:22:41,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-10-11 02:22:41,440 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:22:41,440 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:22:41,656 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-10-11 02:22:41,656 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:22:41,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:22:41,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1725758412, now seen corresponding path program 1 times [2021-10-11 02:22:41,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:22:41,657 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550926462] [2021-10-11 02:22:41,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:22:41,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:22:41,910 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-11 02:22:41,910 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550926462] [2021-10-11 02:22:41,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925534092] [2021-10-11 02:22:41,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:22:41,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:22:41,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-11 02:22:41,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:22:42,086 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-10-11 02:22:42,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:22:42,864 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-10-11 02:22:42,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1795280496] [2021-10-11 02:22:42,873 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-10-11 02:22:42,873 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:22:42,874 FATAL L? ?]: Ignoring 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:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:22:42,877 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:22:42,877 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 13] total 24 [2021-10-11 02:22:42,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175556223] [2021-10-11 02:22:42,881 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-10-11 02:22:42,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:22:42,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-11 02:22:42,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=478, Unknown=0, NotChecked=0, Total=552 [2021-10-11 02:22:42,884 INFO L87 Difference]: Start difference. First operand 24 states and 31 transitions. Second operand 24 states. [2021-10-11 02:22:44,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:22:44,292 INFO L93 Difference]: Finished difference Result 71 states and 132 transitions. [2021-10-11 02:22:44,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-10-11 02:22:44,293 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2021-10-11 02:22:44,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:22:44,309 INFO L225 Difference]: With dead ends: 71 [2021-10-11 02:22:44,311 INFO L226 Difference]: Without dead ends: 65 [2021-10-11 02:22:44,314 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=423, Invalid=2027, Unknown=0, NotChecked=0, Total=2450 [2021-10-11 02:22:44,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-10-11 02:22:44,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 37. [2021-10-11 02:22:44,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2021-10-11 02:22:44,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 63 transitions. [2021-10-11 02:22:44,362 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 63 transitions. Word has length 31 [2021-10-11 02:22:44,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:22:44,363 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 63 transitions. [2021-10-11 02:22:44,363 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2021-10-11 02:22:44,363 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 63 transitions. [2021-10-11 02:22:44,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-10-11 02:22:44,369 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:22:44,370 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:22:44,596 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:22:44,596 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:22:44,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:22:44,596 INFO L82 PathProgramCache]: Analyzing trace with hash 1482164270, now seen corresponding path program 2 times [2021-10-11 02:22:44,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:22:44,597 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764598972] [2021-10-11 02:22:44,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:22:44,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:22:44,746 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 35 proven. 10 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-10-11 02:22:44,747 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764598972] [2021-10-11 02:22:44,747 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848496779] [2021-10-11 02:22:44,748 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:22:44,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-10-11 02:22:44,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:22:44,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-11 02:22:44,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:22:44,983 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 23 proven. 6 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-10-11 02:22:44,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:22:45,763 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-10-11 02:22:45,764 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2021-10-11 02:22:45,764 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9, 9] total 20 [2021-10-11 02:22:45,764 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011392388] [2021-10-11 02:22:45,765 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-10-11 02:22:45,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:22:45,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-11 02:22:45,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2021-10-11 02:22:45,766 INFO L87 Difference]: Start difference. First operand 37 states and 63 transitions. Second operand 9 states. [2021-10-11 02:22:45,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:22:45,981 INFO L93 Difference]: Finished difference Result 54 states and 97 transitions. [2021-10-11 02:22:45,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-11 02:22:45,982 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 45 [2021-10-11 02:22:45,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:22:45,984 INFO L225 Difference]: With dead ends: 54 [2021-10-11 02:22:45,984 INFO L226 Difference]: Without dead ends: 50 [2021-10-11 02:22:45,985 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=481, Unknown=0, NotChecked=0, Total=552 [2021-10-11 02:22:45,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-10-11 02:22:45,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-10-11 02:22:45,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-10-11 02:22:45,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 92 transitions. [2021-10-11 02:22:45,999 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 92 transitions. Word has length 45 [2021-10-11 02:22:45,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:22:46,000 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 92 transitions. [2021-10-11 02:22:46,000 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-10-11 02:22:46,000 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 92 transitions. [2021-10-11 02:22:46,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-10-11 02:22:46,003 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:22:46,003 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:22:46,220 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:22:46,220 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:22:46,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:22:46,220 INFO L82 PathProgramCache]: Analyzing trace with hash 574138169, now seen corresponding path program 3 times [2021-10-11 02:22:46,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:22:46,221 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445981370] [2021-10-11 02:22:46,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:22:46,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:22:46,377 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 56 proven. 34 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-10-11 02:22:46,378 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445981370] [2021-10-11 02:22:46,379 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527515822] [2021-10-11 02:22:46,379 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:22:46,461 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-11 02:22:46,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-11 02:22:46,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-11 02:22:46,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:22:46,688 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 71 proven. 49 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-10-11 02:22:46,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:22:48,037 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 71 proven. 58 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-10-11 02:22:48,037 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [635914146] [2021-10-11 02:22:48,040 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-10-11 02:22:48,040 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:22:48,041 FATAL L? ?]: Ignoring 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:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:22:48,041 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:22:48,041 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 13] total 24 [2021-10-11 02:22:48,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903482708] [2021-10-11 02:22:48,044 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-10-11 02:22:48,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:22:48,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-11 02:22:48,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-10-11 02:22:48,048 INFO L87 Difference]: Start difference. First operand 50 states and 92 transitions. Second operand 24 states. [2021-10-11 02:22:49,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:22:49,194 INFO L93 Difference]: Finished difference Result 137 states and 412 transitions. [2021-10-11 02:22:49,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-10-11 02:22:49,195 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 65 [2021-10-11 02:22:49,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:22:49,200 INFO L225 Difference]: With dead ends: 137 [2021-10-11 02:22:49,200 INFO L226 Difference]: Without dead ends: 91 [2021-10-11 02:22:49,206 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=425, Invalid=1381, Unknown=0, NotChecked=0, Total=1806 [2021-10-11 02:22:49,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-10-11 02:22:49,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 71. [2021-10-11 02:22:49,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2021-10-11 02:22:49,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 122 transitions. [2021-10-11 02:22:49,230 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 122 transitions. Word has length 65 [2021-10-11 02:22:49,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:22:49,231 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 122 transitions. [2021-10-11 02:22:49,231 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2021-10-11 02:22:49,231 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 122 transitions. [2021-10-11 02:22:49,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-10-11 02:22:49,237 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 02:22:49,237 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 11, 7, 7, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 02:22:49,464 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-11 02:22:49,464 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 02:22:49,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 02:22:49,465 INFO L82 PathProgramCache]: Analyzing trace with hash -92596699, now seen corresponding path program 4 times [2021-10-11 02:22:49,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-11 02:22:49,465 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1486268678] [2021-10-11 02:22:49,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 02:22:49,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:22:49,714 INFO L134 CoverageAnalysis]: Checked inductivity of 601 backedges. 118 proven. 203 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2021-10-11 02:22:49,714 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1486268678] [2021-10-11 02:22:49,715 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1899440437] [2021-10-11 02:22:49,715 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/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 [2021-10-11 02:22:49,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 02:22:49,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 18 conjunts are in the unsatisfiable core [2021-10-11 02:22:49,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-11 02:22:50,010 INFO L134 CoverageAnalysis]: Checked inductivity of 601 backedges. 118 proven. 203 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2021-10-11 02:22:50,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-11 02:22:52,628 INFO L134 CoverageAnalysis]: Checked inductivity of 601 backedges. 118 proven. 255 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2021-10-11 02:22:52,628 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [196189141] [2021-10-11 02:22:52,632 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-10-11 02:22:52,632 INFO L166 IcfgInterpreter]: Building call graph [2021-10-11 02:22:52,633 FATAL L? ?]: Ignoring 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:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-11 02:22:52,633 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-11 02:22:52,634 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 14 [2021-10-11 02:22:52,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400498835] [2021-10-11 02:22:52,637 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-10-11 02:22:52,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-11 02:22:52,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-11 02:22:52,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2021-10-11 02:22:52,638 INFO L87 Difference]: Start difference. First operand 71 states and 122 transitions. Second operand 14 states. [2021-10-11 02:22:52,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 02:22:52,827 INFO L93 Difference]: Finished difference Result 104 states and 212 transitions. [2021-10-11 02:22:52,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-11 02:22:52,828 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 112 [2021-10-11 02:22:52,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 02:22:52,829 INFO L225 Difference]: With dead ends: 104 [2021-10-11 02:22:52,829 INFO L226 Difference]: Without dead ends: 0 [2021-10-11 02:22:52,830 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 227 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2021-10-11 02:22:52,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-11 02:22:52,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-11 02:22:52,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2021-10-11 02:22:52,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-11 02:22:52,831 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 112 [2021-10-11 02:22:52,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 02:22:52,831 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-11 02:22:52,831 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2021-10-11 02:22:52,831 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-11 02:22:52,831 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-11 02:22:53,036 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-10-11 02:22:53,037 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-10-11 02:22:53,800 WARN L197 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 28 [2021-10-11 02:22:53,921 WARN L197 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 15 [2021-10-11 02:22:53,983 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-10-11 02:22:53,984 INFO L262 CegarLoopResult]: For program point L30(lines 30 34) no Hoare annotation was computed. [2021-10-11 02:22:53,984 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-10-11 02:22:53,984 INFO L265 CegarLoopResult]: At program point L28(lines 28 48) the Hoare annotation is: true [2021-10-11 02:22:53,984 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 46) no Hoare annotation was computed. [2021-10-11 02:22:53,985 INFO L262 CegarLoopResult]: For program point L46(line 46) no Hoare annotation was computed. [2021-10-11 02:22:53,985 INFO L262 CegarLoopResult]: For program point L43(lines 43 47) no Hoare annotation was computed. [2021-10-11 02:22:53,985 INFO L258 CegarLoopResult]: At program point L42(line 42) the Hoare annotation is: (and (<= ULTIMATE.start_main_~m~0 3) (<= 0 ULTIMATE.start_main_~n~0)) [2021-10-11 02:22:53,985 INFO L262 CegarLoopResult]: For program point L42-1(line 42) no Hoare annotation was computed. [2021-10-11 02:22:53,985 INFO L262 CegarLoopResult]: For program point L36(lines 36 41) no Hoare annotation was computed. [2021-10-11 02:22:53,986 INFO L262 CegarLoopResult]: For program point ackermannEXIT(lines 17 25) no Hoare annotation was computed. [2021-10-11 02:22:53,986 INFO L258 CegarLoopResult]: At program point L24(line 24) the Hoare annotation is: (and (or (not (<= |ackermann_#in~m| 0)) (not (<= 0 |ackermann_#in~m|))) (= ackermann_~n |ackermann_#in~n|) (<= |ackermann_#in~m| ackermann_~m) (<= ackermann_~m |ackermann_#in~m|)) [2021-10-11 02:22:53,987 INFO L262 CegarLoopResult]: For program point L24-1(line 24) no Hoare annotation was computed. [2021-10-11 02:22:53,988 INFO L258 CegarLoopResult]: At program point L22(line 22) the Hoare annotation is: (and (<= |ackermann_#in~n| 0) (or (not (<= 0 |ackermann_#in~m|)) (<= 1 |ackermann_#in~m|)) (= ackermann_~n |ackermann_#in~n|) (<= |ackermann_#in~m| ackermann_~m) (<= ackermann_~m |ackermann_#in~m|)) [2021-10-11 02:22:53,998 INFO L258 CegarLoopResult]: At program point L24-2(line 24) the Hoare annotation is: (let ((.cse2 (<= ackermann_~m |ackermann_#in~m|)) (.cse0 (= ackermann_~n |ackermann_#in~n|)) (.cse1 (<= |ackermann_#in~m| ackermann_~m))) (or (and (<= |ackermann_#in~m| 0) (<= 0 |ackermann_#in~m|) .cse0 .cse1 .cse2) (and (<= 0 (+ |ackermann_#t~ret8| 1)) .cse0 .cse1 (<= 2 |ackermann_#in~m|) .cse2) (and (<= 3 |ackermann_#in~m|) .cse0 .cse1 .cse2) (and (<= 2 |ackermann_#t~ret8|) (<= ackermann_~m 1) (<= 1 |ackermann_#in~m|) .cse0 .cse1))) [2021-10-11 02:22:53,999 INFO L265 CegarLoopResult]: At program point ackermannENTRY(lines 17 25) the Hoare annotation is: true [2021-10-11 02:22:53,999 INFO L262 CegarLoopResult]: For program point L21(lines 21 23) no Hoare annotation was computed. [2021-10-11 02:22:53,999 INFO L262 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2021-10-11 02:22:53,999 INFO L262 CegarLoopResult]: For program point L24-3(line 24) no Hoare annotation was computed. [2021-10-11 02:22:53,999 INFO L262 CegarLoopResult]: For program point L18(lines 18 20) no Hoare annotation was computed. [2021-10-11 02:22:53,999 INFO L262 CegarLoopResult]: For program point ackermannFINAL(lines 17 25) no Hoare annotation was computed. [2021-10-11 02:22:54,009 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.10 02:22:54 BoogieIcfgContainer [2021-10-11 02:22:54,010 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-11 02:22:54,011 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-11 02:22:54,011 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-11 02:22:54,011 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-11 02:22:54,012 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 02:22:39" (3/4) ... [2021-10-11 02:22:54,016 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-11 02:22:54,023 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ackermann [2021-10-11 02:22:54,028 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2021-10-11 02:22:54,028 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2021-10-11 02:22:54,028 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-11 02:22:54,029 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-11 02:22:54,073 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d07cf9e9-dabc-470e-b293-fc0e7be84065/bin/utaipan-WLngWcDbfI/witness.graphml [2021-10-11 02:22:54,073 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-11 02:22:54,075 INFO L168 Benchmark]: Toolchain (without parser) took 15675.94 ms. Allocated memory was 94.4 MB in the beginning and 237.0 MB in the end (delta: 142.6 MB). Free memory was 60.8 MB in the beginning and 76.0 MB in the end (delta: -15.2 MB). Peak memory consumption was 126.2 MB. Max. memory is 16.1 GB. [2021-10-11 02:22:54,075 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 94.4 MB. Free memory was 64.1 MB in the beginning and 64.1 MB in the end (delta: 32.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:22:54,076 INFO L168 Benchmark]: CACSL2BoogieTranslator took 285.81 ms. Allocated memory is still 94.4 MB. Free memory was 60.6 MB in the beginning and 71.4 MB in the end (delta: -10.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-11 02:22:54,077 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.34 ms. Allocated memory is still 94.4 MB. Free memory was 71.4 MB in the beginning and 70.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:22:54,077 INFO L168 Benchmark]: Boogie Preprocessor took 38.01 ms. Allocated memory is still 94.4 MB. Free memory was 70.0 MB in the beginning and 68.8 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 02:22:54,078 INFO L168 Benchmark]: RCFGBuilder took 518.53 ms. Allocated memory is still 94.4 MB. Free memory was 68.8 MB in the beginning and 54.6 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-11 02:22:54,079 INFO L168 Benchmark]: TraceAbstraction took 14723.25 ms. Allocated memory was 94.4 MB in the beginning and 237.0 MB in the end (delta: 142.6 MB). Free memory was 54.2 MB in the beginning and 79.1 MB in the end (delta: -24.9 MB). Peak memory consumption was 125.8 MB. Max. memory is 16.1 GB. [2021-10-11 02:22:54,079 INFO L168 Benchmark]: Witness Printer took 63.02 ms. Allocated memory is still 237.0 MB. Free memory was 79.1 MB in the beginning and 76.0 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 02:22:54,082 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 94.4 MB. Free memory was 64.1 MB in the beginning and 64.1 MB in the end (delta: 32.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 285.81 ms. Allocated memory is still 94.4 MB. Free memory was 60.6 MB in the beginning and 71.4 MB in the end (delta: -10.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 39.34 ms. Allocated memory is still 94.4 MB. Free memory was 71.4 MB in the beginning and 70.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 38.01 ms. Allocated memory is still 94.4 MB. Free memory was 70.0 MB in the beginning and 68.8 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 518.53 ms. Allocated memory is still 94.4 MB. Free memory was 68.8 MB in the beginning and 54.6 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 14723.25 ms. Allocated memory was 94.4 MB in the beginning and 237.0 MB in the end (delta: 142.6 MB). Free memory was 54.2 MB in the beginning and 79.1 MB in the end (delta: -24.9 MB). Peak memory consumption was 125.8 MB. Max. memory is 16.1 GB. * Witness Printer took 63.02 ms. Allocated memory is still 237.0 MB. Free memory was 79.1 MB in the beginning and 76.0 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 46]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 28]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 13.6s, OverallIterations: 7, TraceHistogramMax: 16, AutomataDifference: 3.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.9s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 138 SDtfs, 323 SDslu, 530 SDs, 0 SdLazy, 1342 SolverSat, 544 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 687 GetRequests, 527 SyntacticMatches, 4 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 2.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=71occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 7 MinimizatonAttempts, 50 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 6 LocationsWithAnnotation, 98 PreInvPairs, 172 NumberOfFragments, 113 HoareAnnotationTreeSize, 98 FomulaSimplifications, 8555 FormulaSimplificationTreeSizeReduction, 0.4s HoareSimplificationTime, 6 FomulaSimplificationsInter, 2079 FormulaSimplificationTreeSizeReductionInter, 0.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 7.5s InterpolantComputationTime, 583 NumberOfCodeBlocks, 564 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 131939 SizeOfPredicates, 25 NumberOfNonLiveVariables, 882 ConjunctsInSsa, 64 ConjunctsInUnsatCore, 17 InterpolantComputations, 3 PerfectInterpolantSequences, 1817/2659 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...