./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/MultCommutative-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/MultCommutative-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba --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 ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 02:26:47,721 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:26:47,724 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:26:47,756 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:26:47,758 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:26:47,761 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:26:47,764 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:26:47,767 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:26:47,769 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:26:47,775 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:26:47,776 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:26:47,779 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:26:47,779 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:26:47,783 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:26:47,785 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:26:47,787 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:26:47,789 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:26:47,790 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:26:47,792 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:26:47,798 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:26:47,799 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:26:47,801 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:26:47,803 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:26:47,804 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:26:47,814 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:26:47,814 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:26:47,814 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:26:47,816 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:26:47,817 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:26:47,818 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:26:47,818 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:26:47,819 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:26:47,822 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:26:47,823 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:26:47,824 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:26:47,824 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:26:47,825 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:26:47,825 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:26:47,826 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:26:47,827 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:26:47,828 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:26:47,829 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 02:26:47,866 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:26:47,867 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:26:47,867 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:26:47,867 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:26:47,868 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:26:47,869 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:26:47,869 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:26:47,869 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:26:47,869 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:26:47,869 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:26:47,870 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:26:47,870 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:26:47,871 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:26:47,871 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:26:47,871 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:26:47,871 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:26:47,871 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:26:47,872 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:26:47,873 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:26:47,873 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:26:47,873 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:26:47,873 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:26:47,873 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:26:47,873 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 02:26:47,874 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:26:47,874 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 02:26:47,874 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:26:47,874 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 02:26:47,874 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:26:47,874 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 02:26:47,875 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:26:47,875 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:26:47,875 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:26:47,875 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:26:47,876 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:26:47,876 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:26:47,876 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 02:26:47,876 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:26:47,876 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:26:47,876 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 02:26:47,877 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:26:47,877 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd [2022-11-22 02:26:48,187 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:26:48,216 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:26:48,221 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:26:48,223 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:26:48,223 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:26:48,224 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/recursive/MultCommutative-2.c [2022-11-22 02:26:51,192 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:26:51,436 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:26:51,437 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/sv-benchmarks/c/recursive/MultCommutative-2.c [2022-11-22 02:26:51,443 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/data/24496c74e/f68bd6e4321a4ea7b33541d488e728a1/FLAGe1e6ae0d5 [2022-11-22 02:26:51,457 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/data/24496c74e/f68bd6e4321a4ea7b33541d488e728a1 [2022-11-22 02:26:51,460 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:26:51,462 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:26:51,463 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:26:51,463 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:26:51,467 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:26:51,468 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,469 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@465d62a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51, skipping insertion in model container [2022-11-22 02:26:51,469 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,477 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:26:51,489 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:26:51,675 WARN L237 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_355016b9-b961-4edb-a3b4-cbaba497ce93/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2022-11-22 02:26:51,680 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:26:51,691 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:26:51,714 WARN L237 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_355016b9-b961-4edb-a3b4-cbaba497ce93/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2022-11-22 02:26:51,715 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:26:51,734 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:26:51,735 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51 WrapperNode [2022-11-22 02:26:51,735 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:26:51,736 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:26:51,736 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:26:51,737 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:26:51,744 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,751 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,769 INFO L138 Inliner]: procedures = 13, calls = 11, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 36 [2022-11-22 02:26:51,769 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:26:51,770 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:26:51,770 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:26:51,771 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:26:51,780 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,781 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,782 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,782 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,785 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,787 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,788 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,789 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,790 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:26:51,791 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:26:51,791 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:26:51,792 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:26:51,792 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (1/1) ... [2022-11-22 02:26:51,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:26:51,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:26:51,832 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:26:51,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:26:51,882 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 02:26:51,882 INFO L130 BoogieDeclarations]: Found specification of procedure mult [2022-11-22 02:26:51,882 INFO L138 BoogieDeclarations]: Found implementation of procedure mult [2022-11-22 02:26:51,882 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:26:51,882 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:26:51,882 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 02:26:51,953 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:26:51,955 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:26:52,096 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:26:52,110 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:26:52,110 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-22 02:26:52,113 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:26:52 BoogieIcfgContainer [2022-11-22 02:26:52,113 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:26:52,115 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:26:52,115 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:26:52,118 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:26:52,118 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:26:51" (1/3) ... [2022-11-22 02:26:52,119 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17415b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:26:52, skipping insertion in model container [2022-11-22 02:26:52,119 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:26:51" (2/3) ... [2022-11-22 02:26:52,120 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17415b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:26:52, skipping insertion in model container [2022-11-22 02:26:52,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:26:52" (3/3) ... [2022-11-22 02:26:52,121 INFO L112 eAbstractionObserver]: Analyzing ICFG MultCommutative-2.c [2022-11-22 02:26:52,140 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:26:52,140 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 02:26:52,188 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:26:52,195 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@481cb16e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:26:52,196 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 02:26:52,200 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 02:26:52,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-22 02:26:52,209 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:26:52,210 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:26:52,211 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:26:52,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:26:52,225 INFO L85 PathProgramCache]: Analyzing trace with hash 647179642, now seen corresponding path program 1 times [2022-11-22 02:26:52,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:26:52,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838927727] [2022-11-22 02:26:52,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:52,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:26:52,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:52,621 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 02:26:52,622 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:26:52,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838927727] [2022-11-22 02:26:52,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838927727] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:26:52,623 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:26:52,624 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-22 02:26:52,625 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451602954] [2022-11-22 02:26:52,626 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:26:52,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 02:26:52,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:26:52,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 02:26:52,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-22 02:26:52,676 INFO L87 Difference]: Start difference. First operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 02:26:52,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:26:52,867 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2022-11-22 02:26:52,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:26:52,870 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2022-11-22 02:26:52,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:26:52,879 INFO L225 Difference]: With dead ends: 39 [2022-11-22 02:26:52,879 INFO L226 Difference]: Without dead ends: 27 [2022-11-22 02:26:52,882 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-11-22 02:26:52,885 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 10 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:26:52,886 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 121 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:26:52,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-22 02:26:52,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2022-11-22 02:26:52,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-22 02:26:52,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2022-11-22 02:26:52,928 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 19 [2022-11-22 02:26:52,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:26:52,928 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2022-11-22 02:26:52,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 02:26:52,929 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2022-11-22 02:26:52,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-22 02:26:52,931 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:26:52,931 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:26:52,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 02:26:52,932 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:26:52,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:26:52,933 INFO L85 PathProgramCache]: Analyzing trace with hash 1580415186, now seen corresponding path program 1 times [2022-11-22 02:26:52,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:26:52,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728009981] [2022-11-22 02:26:52,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:52,934 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:26:52,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:53,142 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-22 02:26:53,142 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:26:53,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728009981] [2022-11-22 02:26:53,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728009981] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:26:53,143 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:26:53,143 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-22 02:26:53,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609142282] [2022-11-22 02:26:53,143 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:26:53,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 02:26:53,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:26:53,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 02:26:53,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-22 02:26:53,146 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-22 02:26:53,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:26:53,270 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2022-11-22 02:26:53,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-22 02:26:53,271 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2022-11-22 02:26:53,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:26:53,273 INFO L225 Difference]: With dead ends: 36 [2022-11-22 02:26:53,273 INFO L226 Difference]: Without dead ends: 32 [2022-11-22 02:26:53,280 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-11-22 02:26:53,283 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 4 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:26:53,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 123 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:26:53,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-22 02:26:53,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2022-11-22 02:26:53,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-22 02:26:53,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-11-22 02:26:53,293 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 25 [2022-11-22 02:26:53,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:26:53,294 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-11-22 02:26:53,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-22 02:26:53,294 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-11-22 02:26:53,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-22 02:26:53,295 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:26:53,296 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:26:53,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-22 02:26:53,296 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:26:53,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:26:53,297 INFO L85 PathProgramCache]: Analyzing trace with hash -124187766, now seen corresponding path program 1 times [2022-11-22 02:26:53,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:26:53,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649338604] [2022-11-22 02:26:53,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:53,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:26:53,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:53,424 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-22 02:26:53,424 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:26:53,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649338604] [2022-11-22 02:26:53,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649338604] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:26:53,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420567004] [2022-11-22 02:26:53,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:53,426 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:26:53,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:26:53,434 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:26:53,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:26:53,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:53,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-22 02:26:53,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:26:53,584 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-22 02:26:53,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:26:53,667 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-22 02:26:53,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1420567004] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:26:53,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1432888561] [2022-11-22 02:26:53,694 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:26:53,694 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:26:53,698 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:26:53,706 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:26:53,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2022-11-22 02:26:53,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565615708] [2022-11-22 02:26:53,707 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:26:53,707 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-22 02:26:53,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:26:53,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-22 02:26:53,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-22 02:26:53,709 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-22 02:26:53,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:26:53,786 INFO L93 Difference]: Finished difference Result 32 states and 46 transitions. [2022-11-22 02:26:53,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 02:26:53,787 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2022-11-22 02:26:53,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:26:53,788 INFO L225 Difference]: With dead ends: 32 [2022-11-22 02:26:53,788 INFO L226 Difference]: Without dead ends: 24 [2022-11-22 02:26:53,788 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-22 02:26:53,789 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 8 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:26:53,790 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 41 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:26:53,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-22 02:26:53,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2022-11-22 02:26:53,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-22 02:26:53,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2022-11-22 02:26:53,797 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 26 [2022-11-22 02:26:53,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:26:53,797 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2022-11-22 02:26:53,797 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-22 02:26:53,798 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2022-11-22 02:26:53,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-22 02:26:53,799 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:26:53,799 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:26:53,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 02:26:54,004 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:26:54,005 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:26:54,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:26:54,006 INFO L85 PathProgramCache]: Analyzing trace with hash -590605896, now seen corresponding path program 2 times [2022-11-22 02:26:54,006 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:26:54,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809574940] [2022-11-22 02:26:54,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:54,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:26:54,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:54,108 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-22 02:26:54,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:26:54,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809574940] [2022-11-22 02:26:54,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809574940] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:26:54,109 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:26:54,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 02:26:54,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510642727] [2022-11-22 02:26:54,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:26:54,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:26:54,110 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:26:54,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:26:54,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:26:54,111 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-22 02:26:54,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:26:54,161 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2022-11-22 02:26:54,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 02:26:54,161 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2022-11-22 02:26:54,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:26:54,163 INFO L225 Difference]: With dead ends: 25 [2022-11-22 02:26:54,163 INFO L226 Difference]: Without dead ends: 21 [2022-11-22 02:26:54,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-22 02:26:54,164 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 8 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:26:54,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 36 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:26:54,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-22 02:26:54,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-22 02:26:54,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-22 02:26:54,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2022-11-22 02:26:54,170 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 26 [2022-11-22 02:26:54,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:26:54,170 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2022-11-22 02:26:54,170 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-22 02:26:54,171 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2022-11-22 02:26:54,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-22 02:26:54,172 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:26:54,172 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:26:54,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-22 02:26:54,172 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:26:54,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:26:54,173 INFO L85 PathProgramCache]: Analyzing trace with hash 132154764, now seen corresponding path program 3 times [2022-11-22 02:26:54,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:26:54,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099903454] [2022-11-22 02:26:54,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:54,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:26:54,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:54,784 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 02:26:54,785 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:26:54,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099903454] [2022-11-22 02:26:54,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099903454] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:26:54,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911669282] [2022-11-22 02:26:54,786 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:26:54,786 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:26:54,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:26:54,787 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:26:54,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:26:54,861 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:26:54,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:26:54,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-22 02:26:54,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:26:55,271 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:26:55,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:26:56,484 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:26:56,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911669282] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:26:56,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [225595069] [2022-11-22 02:26:56,489 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:26:56,489 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:26:56,490 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:26:56,492 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:26:56,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11, 14] total 35 [2022-11-22 02:26:56,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129472374] [2022-11-22 02:26:56,493 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:26:56,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 02:26:56,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:26:56,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 02:26:56,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1061, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 02:26:56,497 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-22 02:26:57,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:26:57,474 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2022-11-22 02:26:57,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 02:26:57,475 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) Word has length 33 [2022-11-22 02:26:57,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:26:57,476 INFO L225 Difference]: With dead ends: 40 [2022-11-22 02:26:57,476 INFO L226 Difference]: Without dead ends: 36 [2022-11-22 02:26:57,477 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=293, Invalid=1777, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 02:26:57,478 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 84 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:26:57,479 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 133 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:26:57,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-22 02:26:57,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2022-11-22 02:26:57,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 20 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 4 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-22 02:26:57,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2022-11-22 02:26:57,489 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 33 [2022-11-22 02:26:57,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:26:57,490 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2022-11-22 02:26:57,490 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-22 02:26:57,490 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2022-11-22 02:26:57,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-22 02:26:57,492 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:26:57,492 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:26:57,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 02:26:57,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:26:57,699 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:26:57,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:26:57,700 INFO L85 PathProgramCache]: Analyzing trace with hash 169705396, now seen corresponding path program 1 times [2022-11-22 02:26:57,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:26:57,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166059997] [2022-11-22 02:26:57,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:57,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:26:57,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:57,776 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 02:26:57,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:26:57,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166059997] [2022-11-22 02:26:57,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [166059997] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:26:57,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148226347] [2022-11-22 02:26:57,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:57,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:26:57,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:26:57,791 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:26:57,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:26:57,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:57,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-22 02:26:57,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:26:57,937 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-22 02:26:57,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:26:58,119 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-22 02:26:58,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148226347] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:26:58,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [614107718] [2022-11-22 02:26:58,122 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-22 02:26:58,122 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:26:58,123 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:26:58,124 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:26:58,124 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 10 [2022-11-22 02:26:58,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644407030] [2022-11-22 02:26:58,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:26:58,125 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-22 02:26:58,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:26:58,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-22 02:26:58,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2022-11-22 02:26:58,127 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-22 02:26:58,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:26:58,267 INFO L93 Difference]: Finished difference Result 56 states and 82 transitions. [2022-11-22 02:26:58,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-22 02:26:58,267 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 39 [2022-11-22 02:26:58,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:26:58,268 INFO L225 Difference]: With dead ends: 56 [2022-11-22 02:26:58,269 INFO L226 Difference]: Without dead ends: 24 [2022-11-22 02:26:58,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=159, Unknown=0, NotChecked=0, Total=240 [2022-11-22 02:26:58,271 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 31 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:26:58,271 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 58 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:26:58,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-22 02:26:58,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-11-22 02:26:58,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.0625) internal successors, (17), 17 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-22 02:26:58,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2022-11-22 02:26:58,278 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 39 [2022-11-22 02:26:58,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:26:58,279 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2022-11-22 02:26:58,279 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-22 02:26:58,279 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2022-11-22 02:26:58,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-22 02:26:58,280 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:26:58,280 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:26:58,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 02:26:58,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-22 02:26:58,487 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:26:58,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:26:58,488 INFO L85 PathProgramCache]: Analyzing trace with hash 735115528, now seen corresponding path program 4 times [2022-11-22 02:26:58,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:26:58,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470860414] [2022-11-22 02:26:58,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:58,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:26:58,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:59,187 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:26:59,187 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:26:59,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470860414] [2022-11-22 02:26:59,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [470860414] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:26:59,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101444257] [2022-11-22 02:26:59,188 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:26:59,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:26:59,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:26:59,195 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:26:59,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:26:59,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:59,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-22 02:26:59,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:26:59,982 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 7 proven. 31 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 02:26:59,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:27:01,641 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 9 proven. 37 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:27:01,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [101444257] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:27:01,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1231092904] [2022-11-22 02:27:01,644 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:27:01,645 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:27:01,645 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:27:01,646 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:27:01,646 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 22] total 48 [2022-11-22 02:27:01,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646296325] [2022-11-22 02:27:01,647 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:27:01,647 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-22 02:27:01,648 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:27:01,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-22 02:27:01,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2063, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 02:27:01,650 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-22 02:27:02,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:27:02,835 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2022-11-22 02:27:02,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 02:27:02,837 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) Word has length 40 [2022-11-22 02:27:02,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:27:02,837 INFO L225 Difference]: With dead ends: 45 [2022-11-22 02:27:02,838 INFO L226 Difference]: Without dead ends: 39 [2022-11-22 02:27:02,839 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 47 SyntacticMatches, 5 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=434, Invalid=3472, Unknown=0, NotChecked=0, Total=3906 [2022-11-22 02:27:02,840 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 85 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 797 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:27:02,840 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 193 Invalid, 797 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:27:02,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-11-22 02:27:02,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 31. [2022-11-22 02:27:02,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-22 02:27:02,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 40 transitions. [2022-11-22 02:27:02,852 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 40 transitions. Word has length 40 [2022-11-22 02:27:02,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:27:02,853 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 40 transitions. [2022-11-22 02:27:02,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-22 02:27:02,853 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 40 transitions. [2022-11-22 02:27:02,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-22 02:27:02,855 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:27:02,855 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:27:02,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 02:27:03,066 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:03,067 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:27:03,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:27:03,067 INFO L85 PathProgramCache]: Analyzing trace with hash -1490504886, now seen corresponding path program 5 times [2022-11-22 02:27:03,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:27:03,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148369602] [2022-11-22 02:27:03,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:27:03,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:27:03,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:27:04,351 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 02:27:04,352 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:27:04,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148369602] [2022-11-22 02:27:04,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148369602] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:27:04,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1339622659] [2022-11-22 02:27:04,352 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:27:04,352 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:04,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:27:04,355 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:27:04,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 02:27:04,445 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-22 02:27:04,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:27:04,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 85 conjunts are in the unsatisfiable core [2022-11-22 02:27:04,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:27:05,549 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 3 proven. 61 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-11-22 02:27:05,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:27:08,394 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 80 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 02:27:08,394 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1339622659] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:27:08,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1312320789] [2022-11-22 02:27:08,397 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:27:08,397 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:27:08,399 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:27:08,400 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:27:08,400 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 16, 24] total 57 [2022-11-22 02:27:08,400 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624839498] [2022-11-22 02:27:08,400 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:27:08,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-22 02:27:08,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:27:08,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-22 02:27:08,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=2997, Unknown=0, NotChecked=0, Total=3192 [2022-11-22 02:27:08,404 INFO L87 Difference]: Start difference. First operand 31 states and 40 transitions. Second operand has 57 states, 52 states have (on average 1.5) internal successors, (78), 39 states have internal predecessors, (78), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2022-11-22 02:27:10,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:27:10,705 INFO L93 Difference]: Finished difference Result 56 states and 75 transitions. [2022-11-22 02:27:10,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-22 02:27:10,706 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 52 states have (on average 1.5) internal successors, (78), 39 states have internal predecessors, (78), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) Word has length 54 [2022-11-22 02:27:10,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:27:10,707 INFO L225 Difference]: With dead ends: 56 [2022-11-22 02:27:10,708 INFO L226 Difference]: Without dead ends: 48 [2022-11-22 02:27:10,710 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 74 SyntacticMatches, 6 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1311 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=592, Invalid=5414, Unknown=0, NotChecked=0, Total=6006 [2022-11-22 02:27:10,711 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 168 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 1223 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 339 SdHoareTripleChecker+Invalid, 1337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 1223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:27:10,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 339 Invalid, 1337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 1223 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-22 02:27:10,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-22 02:27:10,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 34. [2022-11-22 02:27:10,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (14), 7 states have call predecessors, (14), 5 states have call successors, (14) [2022-11-22 02:27:10,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2022-11-22 02:27:10,722 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 54 [2022-11-22 02:27:10,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:27:10,723 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2022-11-22 02:27:10,723 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 52 states have (on average 1.5) internal successors, (78), 39 states have internal predecessors, (78), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2022-11-22 02:27:10,724 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2022-11-22 02:27:10,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:27:10,725 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:27:10,726 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 7, 7, 7, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:27:10,738 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-22 02:27:10,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:10,932 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:27:10,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:27:10,932 INFO L85 PathProgramCache]: Analyzing trace with hash -71623192, now seen corresponding path program 6 times [2022-11-22 02:27:10,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:27:10,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756951031] [2022-11-22 02:27:10,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:27:10,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:27:10,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:27:12,472 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-22 02:27:12,472 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:27:12,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756951031] [2022-11-22 02:27:12,472 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756951031] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:27:12,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546657] [2022-11-22 02:27:12,472 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:27:12,473 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:12,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:27:12,474 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:27:12,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 02:27:12,562 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:27:12,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:27:12,567 WARN L261 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 109 conjunts are in the unsatisfiable core [2022-11-22 02:27:12,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:27:13,886 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 4 proven. 106 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-11-22 02:27:13,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:27:18,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1546657] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:27:18,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1206415902] [2022-11-22 02:27:18,507 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:27:18,507 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:27:18,508 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:27:18,509 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:27:18,509 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 18] total 49 [2022-11-22 02:27:18,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924090727] [2022-11-22 02:27:18,509 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:27:18,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-22 02:27:18,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:27:18,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-22 02:27:18,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=4585, Unknown=0, NotChecked=0, Total=4830 [2022-11-22 02:27:18,514 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 49 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 34 states have internal predecessors, (64), 11 states have call successors, (11), 1 states have call predecessors, (11), 13 states have return successors, (15), 15 states have call predecessors, (15), 11 states have call successors, (15) [2022-11-22 02:27:20,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:27:20,004 INFO L93 Difference]: Finished difference Result 49 states and 64 transitions. [2022-11-22 02:27:20,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 02:27:20,005 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 34 states have internal predecessors, (64), 11 states have call successors, (11), 1 states have call predecessors, (11), 13 states have return successors, (15), 15 states have call predecessors, (15), 11 states have call successors, (15) Word has length 68 [2022-11-22 02:27:20,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:27:20,006 INFO L225 Difference]: With dead ends: 49 [2022-11-22 02:27:20,006 INFO L226 Difference]: Without dead ends: 43 [2022-11-22 02:27:20,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 79 SyntacticMatches, 6 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1475 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=614, Invalid=6526, Unknown=0, NotChecked=0, Total=7140 [2022-11-22 02:27:20,009 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 82 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 843 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 882 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:27:20,009 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 317 Invalid, 882 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 843 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:27:20,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-22 02:27:20,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 39. [2022-11-22 02:27:20,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 27 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (20), 9 states have call predecessors, (20), 6 states have call successors, (20) [2022-11-22 02:27:20,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 54 transitions. [2022-11-22 02:27:20,020 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 54 transitions. Word has length 68 [2022-11-22 02:27:20,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:27:20,020 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 54 transitions. [2022-11-22 02:27:20,021 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 34 states have internal predecessors, (64), 11 states have call successors, (11), 1 states have call predecessors, (11), 13 states have return successors, (15), 15 states have call predecessors, (15), 11 states have call successors, (15) [2022-11-22 02:27:20,021 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 54 transitions. [2022-11-22 02:27:20,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-22 02:27:20,022 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:27:20,022 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 8, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:27:20,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 02:27:20,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:20,229 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:27:20,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:27:20,229 INFO L85 PathProgramCache]: Analyzing trace with hash 1265942364, now seen corresponding path program 7 times [2022-11-22 02:27:20,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:27:20,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977124891] [2022-11-22 02:27:20,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:27:20,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:27:20,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:27:22,080 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 232 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-22 02:27:22,080 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:27:22,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977124891] [2022-11-22 02:27:22,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977124891] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:27:22,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49913090] [2022-11-22 02:27:22,081 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:27:22,081 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:22,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:27:22,083 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:27:22,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 02:27:22,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:27:22,178 WARN L261 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 121 conjunts are in the unsatisfiable core [2022-11-22 02:27:22,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:27:23,597 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 5 proven. 134 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2022-11-22 02:27:23,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:27:28,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49913090] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:27:28,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1787197624] [2022-11-22 02:27:28,349 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:27:28,350 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:27:28,350 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:27:28,350 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:27:28,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 20] total 54 [2022-11-22 02:27:28,351 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127400178] [2022-11-22 02:27:28,351 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:27:28,351 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-22 02:27:28,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:27:28,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-22 02:27:28,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=5583, Unknown=0, NotChecked=0, Total=5852 [2022-11-22 02:27:28,353 INFO L87 Difference]: Start difference. First operand 39 states and 54 transitions. Second operand has 54 states, 50 states have (on average 1.42) internal successors, (71), 37 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 15 states have return successors, (17), 17 states have call predecessors, (17), 12 states have call successors, (17) [2022-11-22 02:27:30,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:27:30,246 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2022-11-22 02:27:30,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 02:27:30,248 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 50 states have (on average 1.42) internal successors, (71), 37 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 15 states have return successors, (17), 17 states have call predecessors, (17), 12 states have call successors, (17) Word has length 75 [2022-11-22 02:27:30,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:27:30,249 INFO L225 Difference]: With dead ends: 50 [2022-11-22 02:27:30,249 INFO L226 Difference]: Without dead ends: 46 [2022-11-22 02:27:30,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 88 SyntacticMatches, 7 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1743 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=713, Invalid=7659, Unknown=0, NotChecked=0, Total=8372 [2022-11-22 02:27:30,253 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 112 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 1176 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 1226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:27:30,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 366 Invalid, 1226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1176 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 02:27:30,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-22 02:27:30,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2022-11-22 02:27:30,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 6 states have call successors, (6), 2 states have call predecessors, (6), 7 states have return successors, (25), 10 states have call predecessors, (25), 6 states have call successors, (25) [2022-11-22 02:27:30,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 61 transitions. [2022-11-22 02:27:30,264 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 61 transitions. Word has length 75 [2022-11-22 02:27:30,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:27:30,264 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 61 transitions. [2022-11-22 02:27:30,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 50 states have (on average 1.42) internal successors, (71), 37 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 15 states have return successors, (17), 17 states have call predecessors, (17), 12 states have call successors, (17) [2022-11-22 02:27:30,265 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 61 transitions. [2022-11-22 02:27:30,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-22 02:27:30,266 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:27:30,266 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 6, 6, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:27:30,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 02:27:30,474 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-22 02:27:30,475 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:27:30,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:27:30,475 INFO L85 PathProgramCache]: Analyzing trace with hash -87767316, now seen corresponding path program 8 times [2022-11-22 02:27:30,475 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:27:30,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136992212] [2022-11-22 02:27:30,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:27:30,476 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:27:30,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:27:31,500 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 4 proven. 138 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-22 02:27:31,500 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:27:31,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136992212] [2022-11-22 02:27:31,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136992212] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:27:31,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [715029118] [2022-11-22 02:27:31,501 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:27:31,501 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:31,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:27:31,503 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:27:31,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 02:27:31,595 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-22 02:27:31,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:27:31,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 93 conjunts are in the unsatisfiable core [2022-11-22 02:27:31,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:27:32,667 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 32 proven. 80 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-22 02:27:32,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:27:35,872 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 8 proven. 134 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-22 02:27:35,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [715029118] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:27:35,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2007061060] [2022-11-22 02:27:35,875 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:27:35,875 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:27:35,875 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:27:35,878 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:27:35,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 25, 29] total 73 [2022-11-22 02:27:35,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601850561] [2022-11-22 02:27:35,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:27:35,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-22 02:27:35,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:27:35,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-22 02:27:35,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=5006, Unknown=0, NotChecked=0, Total=5256 [2022-11-22 02:27:35,885 INFO L87 Difference]: Start difference. First operand 42 states and 61 transitions. Second operand has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) [2022-11-22 02:27:39,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:27:39,287 INFO L93 Difference]: Finished difference Result 89 states and 122 transitions. [2022-11-22 02:27:39,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-22 02:27:39,288 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) Word has length 61 [2022-11-22 02:27:39,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:27:39,290 INFO L225 Difference]: With dead ends: 89 [2022-11-22 02:27:39,290 INFO L226 Difference]: Without dead ends: 81 [2022-11-22 02:27:39,293 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 75 SyntacticMatches, 3 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2170 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=990, Invalid=9722, Unknown=0, NotChecked=0, Total=10712 [2022-11-22 02:27:39,294 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 152 mSDsluCounter, 662 mSDsCounter, 0 mSdLazyCounter, 2329 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 684 SdHoareTripleChecker+Invalid, 2498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 2329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:27:39,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [157 Valid, 684 Invalid, 2498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 2329 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-22 02:27:39,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-22 02:27:39,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 69. [2022-11-22 02:27:39,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 47 states have internal predecessors, (50), 10 states have call successors, (10), 4 states have call predecessors, (10), 12 states have return successors, (39), 17 states have call predecessors, (39), 10 states have call successors, (39) [2022-11-22 02:27:39,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 99 transitions. [2022-11-22 02:27:39,311 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 99 transitions. Word has length 61 [2022-11-22 02:27:39,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:27:39,311 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 99 transitions. [2022-11-22 02:27:39,312 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) [2022-11-22 02:27:39,312 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 99 transitions. [2022-11-22 02:27:39,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-22 02:27:39,313 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:27:39,313 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 9, 9, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:27:39,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 02:27:39,529 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-22 02:27:39,529 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:27:39,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:27:39,530 INFO L85 PathProgramCache]: Analyzing trace with hash 510736696, now seen corresponding path program 9 times [2022-11-22 02:27:39,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:27:39,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53049087] [2022-11-22 02:27:39,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:27:39,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:27:39,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:27:41,277 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 1 proven. 287 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-22 02:27:41,277 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:27:41,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53049087] [2022-11-22 02:27:41,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [53049087] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:27:41,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282938919] [2022-11-22 02:27:41,277 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:27:41,277 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:41,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:27:41,283 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:27:41,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 02:27:41,384 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:27:41,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:27:41,388 WARN L261 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 133 conjunts are in the unsatisfiable core [2022-11-22 02:27:41,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:27:42,962 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 6 proven. 165 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-11-22 02:27:42,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:27:51,031 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 35 proven. 253 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-22 02:27:51,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282938919] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:27:51,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [895243752] [2022-11-22 02:27:51,033 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:27:51,034 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:27:51,034 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:27:51,035 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:27:51,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 22, 37] total 85 [2022-11-22 02:27:51,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246172798] [2022-11-22 02:27:51,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:27:51,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-11-22 02:27:51,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:27:51,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-11-22 02:27:51,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=6838, Unknown=2, NotChecked=0, Total=7140 [2022-11-22 02:27:51,038 INFO L87 Difference]: Start difference. First operand 69 states and 99 transitions. Second operand has 85 states, 79 states have (on average 1.5316455696202531) internal successors, (121), 56 states have internal predecessors, (121), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (30), 29 states have call predecessors, (30), 23 states have call successors, (30) [2022-11-22 02:27:54,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:27:54,690 INFO L93 Difference]: Finished difference Result 90 states and 132 transitions. [2022-11-22 02:27:54,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-22 02:27:54,691 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 79 states have (on average 1.5316455696202531) internal successors, (121), 56 states have internal predecessors, (121), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (30), 29 states have call predecessors, (30), 23 states have call successors, (30) Word has length 82 [2022-11-22 02:27:54,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:27:54,692 INFO L225 Difference]: With dead ends: 90 [2022-11-22 02:27:54,693 INFO L226 Difference]: Without dead ends: 84 [2022-11-22 02:27:54,694 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 111 SyntacticMatches, 9 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2683 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=1013, Invalid=10975, Unknown=2, NotChecked=0, Total=11990 [2022-11-22 02:27:54,695 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 215 mSDsluCounter, 699 mSDsCounter, 0 mSdLazyCounter, 2545 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 720 SdHoareTripleChecker+Invalid, 2685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 2545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:27:54,695 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [217 Valid, 720 Invalid, 2685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 2545 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-22 02:27:54,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-22 02:27:54,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2022-11-22 02:27:54,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 52 states have internal predecessors, (56), 11 states have call successors, (11), 5 states have call predecessors, (11), 13 states have return successors, (41), 18 states have call predecessors, (41), 11 states have call successors, (41) [2022-11-22 02:27:54,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 108 transitions. [2022-11-22 02:27:54,712 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 108 transitions. Word has length 82 [2022-11-22 02:27:54,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:27:54,713 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 108 transitions. [2022-11-22 02:27:54,713 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 79 states have (on average 1.5316455696202531) internal successors, (121), 56 states have internal predecessors, (121), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (30), 29 states have call predecessors, (30), 23 states have call successors, (30) [2022-11-22 02:27:54,713 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 108 transitions. [2022-11-22 02:27:54,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-22 02:27:54,714 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:27:54,714 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 6, 6, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:27:54,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 02:27:54,920 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:54,921 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:27:54,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:27:54,921 INFO L85 PathProgramCache]: Analyzing trace with hash 834620298, now seen corresponding path program 10 times [2022-11-22 02:27:54,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:27:54,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860379479] [2022-11-22 02:27:54,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:27:54,921 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:27:54,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:27:55,975 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 1 proven. 137 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 02:27:55,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:27:55,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860379479] [2022-11-22 02:27:55,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860379479] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:27:55,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182340669] [2022-11-22 02:27:55,976 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:27:55,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:55,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:27:55,979 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:27:55,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 02:27:56,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:27:56,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 97 conjunts are in the unsatisfiable core [2022-11-22 02:27:56,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:27:57,181 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 4 proven. 83 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2022-11-22 02:27:57,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:28:00,257 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 23 proven. 115 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-22 02:28:00,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182340669] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:28:00,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [224529947] [2022-11-22 02:28:00,261 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:28:00,261 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:28:00,262 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:28:00,263 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:28:00,263 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 18, 27] total 64 [2022-11-22 02:28:00,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577783860] [2022-11-22 02:28:00,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:28:00,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-22 02:28:00,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:28:00,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-22 02:28:00,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=3808, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 02:28:00,268 INFO L87 Difference]: Start difference. First operand 76 states and 108 transitions. Second operand has 64 states, 59 states have (on average 1.5084745762711864) internal successors, (89), 43 states have internal predecessors, (89), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (22), 21 states have call predecessors, (22), 17 states have call successors, (22) [2022-11-22 02:28:02,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:28:02,628 INFO L93 Difference]: Finished difference Result 90 states and 119 transitions. [2022-11-22 02:28:02,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-22 02:28:02,629 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 59 states have (on average 1.5084745762711864) internal successors, (89), 43 states have internal predecessors, (89), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (22), 21 states have call predecessors, (22), 17 states have call successors, (22) Word has length 61 [2022-11-22 02:28:02,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:28:02,630 INFO L225 Difference]: With dead ends: 90 [2022-11-22 02:28:02,630 INFO L226 Difference]: Without dead ends: 84 [2022-11-22 02:28:02,631 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 83 SyntacticMatches, 7 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1620 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=692, Invalid=6448, Unknown=0, NotChecked=0, Total=7140 [2022-11-22 02:28:02,632 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 213 mSDsluCounter, 450 mSDsCounter, 0 mSdLazyCounter, 1471 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 1595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 1471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:28:02,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [215 Valid, 469 Invalid, 1595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 1471 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-22 02:28:02,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-22 02:28:02,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 70. [2022-11-22 02:28:02,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 4 states have call predecessors, (9), 13 states have return successors, (34), 17 states have call predecessors, (34), 9 states have call successors, (34) [2022-11-22 02:28:02,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 94 transitions. [2022-11-22 02:28:02,647 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 94 transitions. Word has length 61 [2022-11-22 02:28:02,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:28:02,647 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 94 transitions. [2022-11-22 02:28:02,648 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 59 states have (on average 1.5084745762711864) internal successors, (89), 43 states have internal predecessors, (89), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (22), 21 states have call predecessors, (22), 17 states have call successors, (22) [2022-11-22 02:28:02,648 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 94 transitions. [2022-11-22 02:28:02,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-22 02:28:02,649 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:28:02,649 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:28:02,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 02:28:02,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-22 02:28:02,855 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:28:02,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:28:02,855 INFO L85 PathProgramCache]: Analyzing trace with hash 1966394026, now seen corresponding path program 11 times [2022-11-22 02:28:02,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:28:02,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710265856] [2022-11-22 02:28:02,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:28:02,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:28:02,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:28:03,679 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 2 proven. 98 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-22 02:28:03,679 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:28:03,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710265856] [2022-11-22 02:28:03,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710265856] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:28:03,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054597948] [2022-11-22 02:28:03,680 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:28:03,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:28:03,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:28:03,683 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:28:03,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 02:28:03,796 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-22 02:28:03,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:28:03,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-22 02:28:03,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:28:04,735 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 86 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-22 02:28:04,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:28:06,524 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 104 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-22 02:28:06,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054597948] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:28:06,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2086377845] [2022-11-22 02:28:06,529 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:28:06,531 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:28:06,532 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:28:06,533 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:28:06,533 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 25] total 61 [2022-11-22 02:28:06,533 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629450990] [2022-11-22 02:28:06,537 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:28:06,538 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-22 02:28:06,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:28:06,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-22 02:28:06,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=3434, Unknown=0, NotChecked=0, Total=3660 [2022-11-22 02:28:06,539 INFO L87 Difference]: Start difference. First operand 70 states and 94 transitions. Second operand has 61 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 40 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) [2022-11-22 02:28:08,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:28:08,166 INFO L93 Difference]: Finished difference Result 86 states and 119 transitions. [2022-11-22 02:28:08,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 02:28:08,167 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 40 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) Word has length 54 [2022-11-22 02:28:08,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:28:08,168 INFO L225 Difference]: With dead ends: 86 [2022-11-22 02:28:08,168 INFO L226 Difference]: Without dead ends: 80 [2022-11-22 02:28:08,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1428 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=642, Invalid=5838, Unknown=0, NotChecked=0, Total=6480 [2022-11-22 02:28:08,170 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 182 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 1155 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 1298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 1155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:28:08,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [185 Valid, 280 Invalid, 1298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 1155 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 02:28:08,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-22 02:28:08,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 70. [2022-11-22 02:28:08,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 4 states have call predecessors, (9), 13 states have return successors, (32), 17 states have call predecessors, (32), 9 states have call successors, (32) [2022-11-22 02:28:08,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 92 transitions. [2022-11-22 02:28:08,186 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 92 transitions. Word has length 54 [2022-11-22 02:28:08,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:28:08,187 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 92 transitions. [2022-11-22 02:28:08,187 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 40 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) [2022-11-22 02:28:08,187 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 92 transitions. [2022-11-22 02:28:08,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-22 02:28:08,189 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:28:08,189 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 9, 9, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:28:08,198 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-22 02:28:08,395 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:28:08,395 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:28:08,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:28:08,395 INFO L85 PathProgramCache]: Analyzing trace with hash -1392852054, now seen corresponding path program 12 times [2022-11-22 02:28:08,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:28:08,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131094631] [2022-11-22 02:28:08,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:28:08,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:28:08,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:28:10,281 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-22 02:28:10,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:28:10,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131094631] [2022-11-22 02:28:10,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [131094631] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:28:10,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403579287] [2022-11-22 02:28:10,282 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:28:10,282 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:28:10,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:28:10,284 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:28:10,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 02:28:10,403 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:28:10,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:28:10,406 WARN L261 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 133 conjunts are in the unsatisfiable core [2022-11-22 02:28:10,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:28:12,177 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 167 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2022-11-22 02:28:12,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:28:17,749 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 32 proven. 256 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-22 02:28:17,749 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403579287] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:28:17,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [56205948] [2022-11-22 02:28:17,751 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:28:17,751 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:28:17,751 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:28:17,752 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:28:17,752 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 24, 36] total 85 [2022-11-22 02:28:17,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765075390] [2022-11-22 02:28:17,753 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:28:17,753 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-11-22 02:28:17,753 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:28:17,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-11-22 02:28:17,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=6849, Unknown=0, NotChecked=0, Total=7140 [2022-11-22 02:28:17,764 INFO L87 Difference]: Start difference. First operand 70 states and 92 transitions. Second operand has 85 states, 80 states have (on average 1.525) internal successors, (122), 55 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (31), 30 states have call predecessors, (31), 23 states have call successors, (31) [2022-11-22 02:28:20,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:28:20,957 INFO L93 Difference]: Finished difference Result 93 states and 126 transitions. [2022-11-22 02:28:20,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-22 02:28:20,958 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 80 states have (on average 1.525) internal successors, (122), 55 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (31), 30 states have call predecessors, (31), 23 states have call successors, (31) Word has length 82 [2022-11-22 02:28:20,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:28:20,960 INFO L225 Difference]: With dead ends: 93 [2022-11-22 02:28:20,960 INFO L226 Difference]: Without dead ends: 87 [2022-11-22 02:28:20,961 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 110 SyntacticMatches, 10 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2791 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=1074, Invalid=11358, Unknown=0, NotChecked=0, Total=12432 [2022-11-22 02:28:20,962 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 172 mSDsluCounter, 545 mSDsCounter, 0 mSdLazyCounter, 2080 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 564 SdHoareTripleChecker+Invalid, 2195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 2080 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:28:20,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 564 Invalid, 2195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 2080 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-22 02:28:20,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-22 02:28:20,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 73. [2022-11-22 02:28:20,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 50 states have internal predecessors, (53), 9 states have call successors, (9), 4 states have call predecessors, (9), 14 states have return successors, (35), 18 states have call predecessors, (35), 9 states have call successors, (35) [2022-11-22 02:28:20,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 97 transitions. [2022-11-22 02:28:20,978 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 97 transitions. Word has length 82 [2022-11-22 02:28:20,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:28:20,978 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 97 transitions. [2022-11-22 02:28:20,979 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 80 states have (on average 1.525) internal successors, (122), 55 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (31), 30 states have call predecessors, (31), 23 states have call successors, (31) [2022-11-22 02:28:20,979 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 97 transitions. [2022-11-22 02:28:20,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-11-22 02:28:20,980 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:28:20,980 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:28:20,986 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-11-22 02:28:21,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-22 02:28:21,187 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:28:21,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:28:21,187 INFO L85 PathProgramCache]: Analyzing trace with hash 1149449002, now seen corresponding path program 13 times [2022-11-22 02:28:21,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:28:21,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160055548] [2022-11-22 02:28:21,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:28:21,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:28:21,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:28:23,421 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 350 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-22 02:28:23,421 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:28:23,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160055548] [2022-11-22 02:28:23,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [160055548] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:28:23,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170552361] [2022-11-22 02:28:23,421 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:28:23,421 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:28:23,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:28:23,432 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:28:23,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 02:28:23,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:28:23,557 WARN L261 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 145 conjunts are in the unsatisfiable core [2022-11-22 02:28:23,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:28:25,528 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 8 proven. 201 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2022-11-22 02:28:25,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:28:31,750 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 35 proven. 315 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-22 02:28:31,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170552361] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:28:31,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [757890327] [2022-11-22 02:28:31,752 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:28:31,752 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:28:31,753 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:28:31,754 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:28:31,754 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 26, 39] total 92 [2022-11-22 02:28:31,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558041271] [2022-11-22 02:28:31,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:28:31,755 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-11-22 02:28:31,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:28:31,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-11-22 02:28:31,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=315, Invalid=8057, Unknown=0, NotChecked=0, Total=8372 [2022-11-22 02:28:31,757 INFO L87 Difference]: Start difference. First operand 73 states and 97 transitions. Second operand has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) [2022-11-22 02:28:35,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:28:35,264 INFO L93 Difference]: Finished difference Result 96 states and 131 transitions. [2022-11-22 02:28:35,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-22 02:28:35,264 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) Word has length 89 [2022-11-22 02:28:35,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:28:35,266 INFO L225 Difference]: With dead ends: 96 [2022-11-22 02:28:35,266 INFO L226 Difference]: Without dead ends: 90 [2022-11-22 02:28:35,267 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 119 SyntacticMatches, 11 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3280 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=1219, Invalid=13301, Unknown=0, NotChecked=0, Total=14520 [2022-11-22 02:28:35,267 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 139 mSDsluCounter, 611 mSDsCounter, 0 mSdLazyCounter, 2168 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 633 SdHoareTripleChecker+Invalid, 2265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 2168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:28:35,268 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [141 Valid, 633 Invalid, 2265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 2168 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-22 02:28:35,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-22 02:28:35,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 76. [2022-11-22 02:28:35,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (38), 19 states have call predecessors, (38), 9 states have call successors, (38) [2022-11-22 02:28:35,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 102 transitions. [2022-11-22 02:28:35,285 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 102 transitions. Word has length 89 [2022-11-22 02:28:35,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:28:35,286 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 102 transitions. [2022-11-22 02:28:35,286 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) [2022-11-22 02:28:35,286 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 102 transitions. [2022-11-22 02:28:35,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-11-22 02:28:35,288 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:28:35,288 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 11, 11, 11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:28:35,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-22 02:28:35,494 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 02:28:35,494 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:28:35,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:28:35,494 INFO L85 PathProgramCache]: Analyzing trace with hash -545950054, now seen corresponding path program 14 times [2022-11-22 02:28:35,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:28:35,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14375766] [2022-11-22 02:28:35,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:28:35,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:28:35,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:28:37,858 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2022-11-22 02:28:37,858 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:28:37,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14375766] [2022-11-22 02:28:37,859 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14375766] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:28:37,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929685715] [2022-11-22 02:28:37,862 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:28:37,862 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:28:37,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:28:37,864 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:28:37,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 02:28:38,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-22 02:28:38,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:28:38,010 WARN L261 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 157 conjunts are in the unsatisfiable core [2022-11-22 02:28:38,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:28:39,823 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 5 proven. 233 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2022-11-22 02:28:39,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:28:45,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929685715] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:28:45,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1105262458] [2022-11-22 02:28:45,815 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:28:45,815 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:28:45,815 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:28:45,815 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:28:45,815 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 22] total 65 [2022-11-22 02:28:45,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5375151] [2022-11-22 02:28:45,816 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:28:45,816 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-22 02:28:45,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:28:45,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-22 02:28:45,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=7347, Unknown=0, NotChecked=0, Total=7656 [2022-11-22 02:28:45,817 INFO L87 Difference]: Start difference. First operand 76 states and 102 transitions. Second operand has 65 states, 61 states have (on average 1.4426229508196722) internal successors, (88), 44 states have internal predecessors, (88), 15 states have call successors, (15), 1 states have call predecessors, (15), 19 states have return successors, (21), 21 states have call predecessors, (21), 15 states have call successors, (21) [2022-11-22 02:28:48,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:28:48,005 INFO L93 Difference]: Finished difference Result 86 states and 112 transitions. [2022-11-22 02:28:48,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-22 02:28:48,006 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 61 states have (on average 1.4426229508196722) internal successors, (88), 44 states have internal predecessors, (88), 15 states have call successors, (15), 1 states have call predecessors, (15), 19 states have return successors, (21), 21 states have call predecessors, (21), 15 states have call successors, (21) Word has length 96 [2022-11-22 02:28:48,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:28:48,006 INFO L225 Difference]: With dead ends: 86 [2022-11-22 02:28:48,007 INFO L226 Difference]: Without dead ends: 82 [2022-11-22 02:28:48,007 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 107 SyntacticMatches, 7 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1973 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=868, Invalid=10052, Unknown=0, NotChecked=0, Total=10920 [2022-11-22 02:28:48,008 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 105 mSDsluCounter, 489 mSDsCounter, 0 mSdLazyCounter, 1532 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 506 SdHoareTripleChecker+Invalid, 1581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1532 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:28:48,008 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 506 Invalid, 1581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1532 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-22 02:28:48,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-22 02:28:48,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 76. [2022-11-22 02:28:48,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (38), 19 states have call predecessors, (38), 9 states have call successors, (38) [2022-11-22 02:28:48,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 102 transitions. [2022-11-22 02:28:48,024 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 102 transitions. Word has length 96 [2022-11-22 02:28:48,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:28:48,025 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 102 transitions. [2022-11-22 02:28:48,025 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 61 states have (on average 1.4426229508196722) internal successors, (88), 44 states have internal predecessors, (88), 15 states have call successors, (15), 1 states have call predecessors, (15), 19 states have return successors, (21), 21 states have call predecessors, (21), 15 states have call successors, (21) [2022-11-22 02:28:48,025 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 102 transitions. [2022-11-22 02:28:48,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-11-22 02:28:48,027 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:28:48,027 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 11, 11, 11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:28:48,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 02:28:48,233 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-22 02:28:48,233 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:28:48,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:28:48,233 INFO L85 PathProgramCache]: Analyzing trace with hash -2050033702, now seen corresponding path program 15 times [2022-11-22 02:28:48,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:28:48,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158966839] [2022-11-22 02:28:48,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:28:48,234 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:28:48,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:28:50,597 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2022-11-22 02:28:50,598 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:28:50,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158966839] [2022-11-22 02:28:50,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158966839] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:28:50,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164028532] [2022-11-22 02:28:50,598 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:28:50,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:28:50,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:28:50,603 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:28:50,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 02:28:50,737 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:28:50,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:28:50,740 WARN L261 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 157 conjunts are in the unsatisfiable core [2022-11-22 02:28:50,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:28:52,949 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 9 proven. 238 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-22 02:28:52,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:28:59,853 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 38 proven. 380 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2022-11-22 02:28:59,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1164028532] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:28:59,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1621251582] [2022-11-22 02:28:59,855 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:28:59,855 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:28:59,856 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:28:59,857 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:28:59,857 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 28, 42] total 99 [2022-11-22 02:28:59,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892656371] [2022-11-22 02:28:59,857 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:28:59,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2022-11-22 02:28:59,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:28:59,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2022-11-22 02:28:59,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=9363, Unknown=0, NotChecked=0, Total=9702 [2022-11-22 02:28:59,860 INFO L87 Difference]: Start difference. First operand 76 states and 102 transitions. Second operand has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) [2022-11-22 02:29:03,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:29:03,844 INFO L93 Difference]: Finished difference Result 99 states and 136 transitions. [2022-11-22 02:29:03,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-22 02:29:03,845 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) Word has length 96 [2022-11-22 02:29:03,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:29:03,846 INFO L225 Difference]: With dead ends: 99 [2022-11-22 02:29:03,846 INFO L226 Difference]: Without dead ends: 93 [2022-11-22 02:29:03,847 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 128 SyntacticMatches, 12 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3810 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=1372, Invalid=15398, Unknown=0, NotChecked=0, Total=16770 [2022-11-22 02:29:03,848 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 352 mSDsluCounter, 769 mSDsCounter, 0 mSdLazyCounter, 2818 mSolverCounterSat, 214 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 791 SdHoareTripleChecker+Invalid, 3032 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 214 IncrementalHoareTripleChecker+Valid, 2818 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:29:03,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [356 Valid, 791 Invalid, 3032 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [214 Valid, 2818 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-22 02:29:03,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-22 02:29:03,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 79. [2022-11-22 02:29:03,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 53 states have (on average 1.0754716981132075) internal successors, (57), 54 states have internal predecessors, (57), 9 states have call successors, (9), 4 states have call predecessors, (9), 16 states have return successors, (41), 20 states have call predecessors, (41), 9 states have call successors, (41) [2022-11-22 02:29:03,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 107 transitions. [2022-11-22 02:29:03,864 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 107 transitions. Word has length 96 [2022-11-22 02:29:03,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:29:03,865 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 107 transitions. [2022-11-22 02:29:03,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) [2022-11-22 02:29:03,865 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 107 transitions. [2022-11-22 02:29:03,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-22 02:29:03,867 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:29:03,867 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 12, 12, 12, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:29:03,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 02:29:04,086 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-22 02:29:04,087 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:29:04,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:29:04,087 INFO L85 PathProgramCache]: Analyzing trace with hash -772884420, now seen corresponding path program 16 times [2022-11-22 02:29:04,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:29:04,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851210403] [2022-11-22 02:29:04,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:29:04,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:29:04,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:29:06,665 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 492 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-22 02:29:06,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:29:06,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851210403] [2022-11-22 02:29:06,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [851210403] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:29:06,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831350662] [2022-11-22 02:29:06,666 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:29:06,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:29:06,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:29:06,667 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:29:06,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 02:29:06,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:29:06,819 WARN L261 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 169 conjunts are in the unsatisfiable core [2022-11-22 02:29:06,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:29:08,848 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 5 proven. 274 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2022-11-22 02:29:08,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:29:14,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831350662] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:29:14,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [63664229] [2022-11-22 02:29:14,880 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:29:14,880 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:29:14,880 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:29:14,880 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:29:14,880 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 24] total 70 [2022-11-22 02:29:14,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707169303] [2022-11-22 02:29:14,881 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:29:14,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-22 02:29:14,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:29:14,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-22 02:29:14,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=8232, Unknown=0, NotChecked=0, Total=8556 [2022-11-22 02:29:14,883 INFO L87 Difference]: Start difference. First operand 79 states and 107 transitions. Second operand has 70 states, 66 states have (on average 1.4393939393939394) internal successors, (95), 47 states have internal predecessors, (95), 16 states have call successors, (16), 1 states have call predecessors, (16), 21 states have return successors, (23), 23 states have call predecessors, (23), 16 states have call successors, (23) [2022-11-22 02:29:17,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:29:17,397 INFO L93 Difference]: Finished difference Result 89 states and 117 transitions. [2022-11-22 02:29:17,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 02:29:17,397 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 66 states have (on average 1.4393939393939394) internal successors, (95), 47 states have internal predecessors, (95), 16 states have call successors, (16), 1 states have call predecessors, (16), 21 states have return successors, (23), 23 states have call predecessors, (23), 16 states have call successors, (23) Word has length 103 [2022-11-22 02:29:17,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:29:17,398 INFO L225 Difference]: With dead ends: 89 [2022-11-22 02:29:17,399 INFO L226 Difference]: Without dead ends: 85 [2022-11-22 02:29:17,400 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 112 SyntacticMatches, 7 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2205 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=972, Invalid=11460, Unknown=0, NotChecked=0, Total=12432 [2022-11-22 02:29:17,400 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 258 mSDsluCounter, 574 mSDsCounter, 0 mSdLazyCounter, 1804 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 1930 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 1804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:29:17,401 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 592 Invalid, 1930 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 1804 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-22 02:29:17,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-22 02:29:17,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2022-11-22 02:29:17,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 53 states have (on average 1.0754716981132075) internal successors, (57), 54 states have internal predecessors, (57), 9 states have call successors, (9), 4 states have call predecessors, (9), 16 states have return successors, (41), 20 states have call predecessors, (41), 9 states have call successors, (41) [2022-11-22 02:29:17,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 107 transitions. [2022-11-22 02:29:17,414 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 107 transitions. Word has length 103 [2022-11-22 02:29:17,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:29:17,415 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 107 transitions. [2022-11-22 02:29:17,415 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 66 states have (on average 1.4393939393939394) internal successors, (95), 47 states have internal predecessors, (95), 16 states have call successors, (16), 1 states have call predecessors, (16), 21 states have return successors, (23), 23 states have call predecessors, (23), 16 states have call successors, (23) [2022-11-22 02:29:17,415 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 107 transitions. [2022-11-22 02:29:17,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-22 02:29:17,416 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:29:17,416 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 15, 15, 15, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:29:17,422 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-22 02:29:17,622 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:29:17,622 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:29:17,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:29:17,622 INFO L85 PathProgramCache]: Analyzing trace with hash 1826787688, now seen corresponding path program 17 times [2022-11-22 02:29:17,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:29:17,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641169537] [2022-11-22 02:29:17,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:29:17,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:29:17,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:29:21,347 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 1 proven. 746 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2022-11-22 02:29:21,347 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:29:21,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641169537] [2022-11-22 02:29:21,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641169537] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:29:21,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2037974792] [2022-11-22 02:29:21,348 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:29:21,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:29:21,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:29:21,349 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:29:21,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 02:29:21,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-11-22 02:29:21,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:29:21,544 WARN L261 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 205 conjunts are in the unsatisfiable core [2022-11-22 02:29:21,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:29:24,179 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 21 proven. 400 refuted. 0 times theorem prover too weak. 469 trivial. 0 not checked. [2022-11-22 02:29:24,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:29:36,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2037974792] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:29:36,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [663617673] [2022-11-22 02:29:36,013 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:29:36,013 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:29:36,014 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:29:36,015 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:29:36,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 30] total 84 [2022-11-22 02:29:36,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298049626] [2022-11-22 02:29:36,015 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:29:36,016 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-11-22 02:29:36,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:29:36,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-11-22 02:29:36,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=13160, Unknown=2, NotChecked=0, Total=13572 [2022-11-22 02:29:36,018 INFO L87 Difference]: Start difference. First operand 79 states and 107 transitions. Second operand has 84 states, 80 states have (on average 1.4375) internal successors, (115), 55 states have internal predecessors, (115), 18 states have call successors, (18), 1 states have call predecessors, (18), 27 states have return successors, (29), 29 states have call predecessors, (29), 18 states have call successors, (29) [2022-11-22 02:29:39,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:29:39,823 INFO L93 Difference]: Finished difference Result 92 states and 128 transitions. [2022-11-22 02:29:39,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-22 02:29:39,824 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 80 states have (on average 1.4375) internal successors, (115), 55 states have internal predecessors, (115), 18 states have call successors, (18), 1 states have call predecessors, (18), 27 states have return successors, (29), 29 states have call predecessors, (29), 18 states have call successors, (29) Word has length 124 [2022-11-22 02:29:39,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:29:39,826 INFO L225 Difference]: With dead ends: 92 [2022-11-22 02:29:39,826 INFO L226 Difference]: Without dead ends: 88 [2022-11-22 02:29:39,828 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 145 SyntacticMatches, 15 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4295 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=1446, Invalid=18574, Unknown=2, NotChecked=0, Total=20022 [2022-11-22 02:29:39,828 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 248 mSDsluCounter, 771 mSDsCounter, 0 mSdLazyCounter, 2506 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 792 SdHoareTripleChecker+Invalid, 2626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 2506 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:29:39,829 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [249 Valid, 792 Invalid, 2626 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 2506 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-22 02:29:39,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-22 02:29:39,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2022-11-22 02:29:39,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 56 states have (on average 1.0714285714285714) internal successors, (60), 57 states have internal predecessors, (60), 10 states have call successors, (10), 4 states have call predecessors, (10), 17 states have return successors, (51), 22 states have call predecessors, (51), 10 states have call successors, (51) [2022-11-22 02:29:39,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 121 transitions. [2022-11-22 02:29:39,850 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 121 transitions. Word has length 124 [2022-11-22 02:29:39,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:29:39,851 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 121 transitions. [2022-11-22 02:29:39,852 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 80 states have (on average 1.4375) internal successors, (115), 55 states have internal predecessors, (115), 18 states have call successors, (18), 1 states have call predecessors, (18), 27 states have return successors, (29), 29 states have call predecessors, (29), 18 states have call successors, (29) [2022-11-22 02:29:39,852 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 121 transitions. [2022-11-22 02:29:39,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-22 02:29:39,853 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:29:39,854 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 16, 16, 16, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:29:39,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-22 02:29:40,054 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:29:40,054 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:29:40,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:29:40,054 INFO L85 PathProgramCache]: Analyzing trace with hash -2116040742, now seen corresponding path program 18 times [2022-11-22 02:29:40,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:29:40,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926282791] [2022-11-22 02:29:40,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:29:40,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:29:40,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:29:44,763 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 0 proven. 845 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2022-11-22 02:29:44,763 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:29:44,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926282791] [2022-11-22 02:29:44,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1926282791] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:29:44,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2134613868] [2022-11-22 02:29:44,764 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:29:44,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:29:44,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:29:44,765 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:29:44,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 02:29:44,964 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:29:44,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:29:44,969 WARN L261 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 217 conjunts are in the unsatisfiable core [2022-11-22 02:29:44,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:29:48,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 10 proven. 460 refuted. 0 times theorem prover too weak. 535 trivial. 0 not checked. [2022-11-22 02:29:48,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:29:59,192 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2134613868] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:29:59,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1990695897] [2022-11-22 02:29:59,193 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:29:59,193 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:29:59,194 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:29:59,195 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:29:59,195 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 30] total 87 [2022-11-22 02:29:59,195 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077558535] [2022-11-22 02:29:59,195 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:29:59,196 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-11-22 02:29:59,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:29:59,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-11-22 02:29:59,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=13858, Unknown=0, NotChecked=0, Total=14280 [2022-11-22 02:29:59,198 INFO L87 Difference]: Start difference. First operand 84 states and 121 transitions. Second operand has 87 states, 83 states have (on average 1.4216867469879517) internal successors, (118), 57 states have internal predecessors, (118), 19 states have call successors, (19), 1 states have call predecessors, (19), 28 states have return successors, (30), 30 states have call predecessors, (30), 19 states have call successors, (30) [2022-11-22 02:30:02,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:02,901 INFO L93 Difference]: Finished difference Result 94 states and 131 transitions. [2022-11-22 02:30:02,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-22 02:30:02,901 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 83 states have (on average 1.4216867469879517) internal successors, (118), 57 states have internal predecessors, (118), 19 states have call successors, (19), 1 states have call predecessors, (19), 28 states have return successors, (30), 30 states have call predecessors, (30), 19 states have call successors, (30) Word has length 131 [2022-11-22 02:30:02,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:02,903 INFO L225 Difference]: With dead ends: 94 [2022-11-22 02:30:02,903 INFO L226 Difference]: Without dead ends: 90 [2022-11-22 02:30:02,905 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 155 SyntacticMatches, 12 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4087 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=1483, Invalid=19397, Unknown=0, NotChecked=0, Total=20880 [2022-11-22 02:30:02,906 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 202 mSDsluCounter, 1044 mSDsCounter, 0 mSdLazyCounter, 2729 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 1068 SdHoareTripleChecker+Invalid, 2826 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 2729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:02,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [203 Valid, 1068 Invalid, 2826 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 2729 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-11-22 02:30:02,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-22 02:30:02,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2022-11-22 02:30:02,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 56 states have (on average 1.0714285714285714) internal successors, (60), 57 states have internal predecessors, (60), 10 states have call successors, (10), 4 states have call predecessors, (10), 17 states have return successors, (51), 22 states have call predecessors, (51), 10 states have call successors, (51) [2022-11-22 02:30:02,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 121 transitions. [2022-11-22 02:30:02,924 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 121 transitions. Word has length 131 [2022-11-22 02:30:02,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:02,925 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 121 transitions. [2022-11-22 02:30:02,925 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 83 states have (on average 1.4216867469879517) internal successors, (118), 57 states have internal predecessors, (118), 19 states have call successors, (19), 1 states have call predecessors, (19), 28 states have return successors, (30), 30 states have call predecessors, (30), 19 states have call successors, (30) [2022-11-22 02:30:02,925 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 121 transitions. [2022-11-22 02:30:02,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-22 02:30:02,926 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:02,926 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 12, 12, 12, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:02,937 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-11-22 02:30:03,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:03,133 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:03,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:03,133 INFO L85 PathProgramCache]: Analyzing trace with hash 1109932794, now seen corresponding path program 19 times [2022-11-22 02:30:03,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:03,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515200837] [2022-11-22 02:30:03,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:03,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:03,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:05,606 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 492 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-22 02:30:05,606 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:05,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515200837] [2022-11-22 02:30:05,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [515200837] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:30:05,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954715986] [2022-11-22 02:30:05,606 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:30:05,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:05,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:05,607 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:30:05,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 02:30:05,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:05,795 WARN L261 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 169 conjunts are in the unsatisfiable core [2022-11-22 02:30:05,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:30:08,243 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 10 proven. 278 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2022-11-22 02:30:08,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:30:16,000 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 41 proven. 451 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-22 02:30:16,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954715986] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:30:16,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1092579646] [2022-11-22 02:30:16,002 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:30:16,002 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:30:16,003 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:30:16,004 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:30:16,004 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 30, 45] total 106 [2022-11-22 02:30:16,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251178246] [2022-11-22 02:30:16,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:30:16,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-11-22 02:30:16,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:16,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-11-22 02:30:16,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=10767, Unknown=0, NotChecked=0, Total=11130 [2022-11-22 02:30:16,007 INFO L87 Difference]: Start difference. First operand 84 states and 121 transitions. Second operand has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) [2022-11-22 02:30:20,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:20,776 INFO L93 Difference]: Finished difference Result 104 states and 144 transitions. [2022-11-22 02:30:20,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-22 02:30:20,777 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) Word has length 103 [2022-11-22 02:30:20,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:20,778 INFO L225 Difference]: With dead ends: 104 [2022-11-22 02:30:20,779 INFO L226 Difference]: Without dead ends: 98 [2022-11-22 02:30:20,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 137 SyntacticMatches, 13 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4379 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=1533, Invalid=17649, Unknown=0, NotChecked=0, Total=19182 [2022-11-22 02:30:20,800 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 524 mSDsluCounter, 1020 mSDsCounter, 0 mSdLazyCounter, 3437 mSolverCounterSat, 293 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 526 SdHoareTripleChecker+Valid, 1045 SdHoareTripleChecker+Invalid, 3730 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 293 IncrementalHoareTripleChecker+Valid, 3437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:20,800 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [526 Valid, 1045 Invalid, 3730 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [293 Valid, 3437 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-22 02:30:20,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-22 02:30:20,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 82. [2022-11-22 02:30:20,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 56 states have internal predecessors, (59), 9 states have call successors, (9), 4 states have call predecessors, (9), 17 states have return successors, (44), 21 states have call predecessors, (44), 9 states have call successors, (44) [2022-11-22 02:30:20,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 112 transitions. [2022-11-22 02:30:20,818 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 112 transitions. Word has length 103 [2022-11-22 02:30:20,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:20,819 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 112 transitions. [2022-11-22 02:30:20,819 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) [2022-11-22 02:30:20,819 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 112 transitions. [2022-11-22 02:30:20,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-11-22 02:30:20,821 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:20,821 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 13, 13, 13, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:20,826 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-11-22 02:30:21,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:21,026 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:21,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:21,027 INFO L85 PathProgramCache]: Analyzing trace with hash 1650246186, now seen corresponding path program 20 times [2022-11-22 02:30:21,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:21,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072343666] [2022-11-22 02:30:21,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:21,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:21,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:24,046 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 572 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2022-11-22 02:30:24,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:24,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072343666] [2022-11-22 02:30:24,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072343666] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:30:24,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592661474] [2022-11-22 02:30:24,047 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:30:24,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:24,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:24,048 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:30:24,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-22 02:30:24,265 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-11-22 02:30:24,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:30:24,270 WARN L261 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 181 conjunts are in the unsatisfiable core [2022-11-22 02:30:24,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:30:26,645 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 5 proven. 318 refuted. 0 times theorem prover too weak. 358 trivial. 0 not checked. [2022-11-22 02:30:26,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:30:33,324 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592661474] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:30:33,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368231108] [2022-11-22 02:30:33,326 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:30:33,326 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:30:33,326 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:30:33,330 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:30:33,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 26] total 75 [2022-11-22 02:30:33,333 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119589656] [2022-11-22 02:30:33,333 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:30:33,334 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-11-22 02:30:33,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:33,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-11-22 02:30:33,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=9167, Unknown=0, NotChecked=0, Total=9506 [2022-11-22 02:30:33,337 INFO L87 Difference]: Start difference. First operand 82 states and 112 transitions. Second operand has 75 states, 71 states have (on average 1.4366197183098592) internal successors, (102), 50 states have internal predecessors, (102), 17 states have call successors, (17), 1 states have call predecessors, (17), 23 states have return successors, (25), 25 states have call predecessors, (25), 17 states have call successors, (25) [2022-11-22 02:30:36,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:36,172 INFO L93 Difference]: Finished difference Result 92 states and 122 transitions. [2022-11-22 02:30:36,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 02:30:36,172 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 71 states have (on average 1.4366197183098592) internal successors, (102), 50 states have internal predecessors, (102), 17 states have call successors, (17), 1 states have call predecessors, (17), 23 states have return successors, (25), 25 states have call predecessors, (25), 17 states have call successors, (25) Word has length 110 [2022-11-22 02:30:36,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:36,174 INFO L225 Difference]: With dead ends: 92 [2022-11-22 02:30:36,174 INFO L226 Difference]: Without dead ends: 88 [2022-11-22 02:30:36,175 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 117 SyntacticMatches, 7 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2453 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=1080, Invalid=12962, Unknown=0, NotChecked=0, Total=14042 [2022-11-22 02:30:36,175 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 113 mSDsluCounter, 686 mSDsCounter, 0 mSdLazyCounter, 1876 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 706 SdHoareTripleChecker+Invalid, 1926 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1876 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:36,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 706 Invalid, 1926 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1876 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-22 02:30:36,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-22 02:30:36,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 82. [2022-11-22 02:30:36,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 56 states have internal predecessors, (59), 9 states have call successors, (9), 4 states have call predecessors, (9), 17 states have return successors, (44), 21 states have call predecessors, (44), 9 states have call successors, (44) [2022-11-22 02:30:36,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 112 transitions. [2022-11-22 02:30:36,191 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 112 transitions. Word has length 110 [2022-11-22 02:30:36,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:36,191 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 112 transitions. [2022-11-22 02:30:36,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 71 states have (on average 1.4366197183098592) internal successors, (102), 50 states have internal predecessors, (102), 17 states have call successors, (17), 1 states have call predecessors, (17), 23 states have return successors, (25), 25 states have call predecessors, (25), 17 states have call successors, (25) [2022-11-22 02:30:36,192 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 112 transitions. [2022-11-22 02:30:36,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-22 02:30:36,193 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:36,193 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 16, 16, 16, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:36,206 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-11-22 02:30:36,400 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:36,400 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:36,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:36,401 INFO L85 PathProgramCache]: Analyzing trace with hash -2074728996, now seen corresponding path program 21 times [2022-11-22 02:30:36,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:36,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696453198] [2022-11-22 02:30:36,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:36,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:36,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:30:40,494 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 0 proven. 848 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2022-11-22 02:30:40,494 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:40,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696453198] [2022-11-22 02:30:40,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1696453198] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:30:40,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706522062] [2022-11-22 02:30:40,494 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:30:40,494 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:40,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:40,495 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:30:40,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-22 02:30:40,722 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:30:40,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:30:40,727 WARN L261 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 217 conjunts are in the unsatisfiable core [2022-11-22 02:30:40,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:30:44,046 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 11 proven. 462 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2022-11-22 02:30:44,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:30:55,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1706522062] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:30:55,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2128984586] [2022-11-22 02:30:55,659 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:30:55,659 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:30:55,659 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:30:55,660 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:30:55,660 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 32] total 90 [2022-11-22 02:30:55,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424947818] [2022-11-22 02:30:55,661 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:30:55,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2022-11-22 02:30:55,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:55,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2022-11-22 02:30:55,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=15063, Unknown=0, NotChecked=0, Total=15500 [2022-11-22 02:30:55,677 INFO L87 Difference]: Start difference. First operand 82 states and 112 transitions. Second operand has 90 states, 86 states have (on average 1.430232558139535) internal successors, (123), 59 states have internal predecessors, (123), 20 states have call successors, (20), 1 states have call predecessors, (20), 29 states have return successors, (31), 31 states have call predecessors, (31), 20 states have call successors, (31) [2022-11-22 02:30:59,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:59,918 INFO L93 Difference]: Finished difference Result 95 states and 133 transitions. [2022-11-22 02:30:59,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-22 02:30:59,919 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 86 states have (on average 1.430232558139535) internal successors, (123), 59 states have internal predecessors, (123), 20 states have call successors, (20), 1 states have call predecessors, (20), 29 states have return successors, (31), 31 states have call predecessors, (31), 20 states have call successors, (31) Word has length 131 [2022-11-22 02:30:59,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:59,920 INFO L225 Difference]: With dead ends: 95 [2022-11-22 02:30:59,920 INFO L226 Difference]: Without dead ends: 91 [2022-11-22 02:30:59,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 156 SyntacticMatches, 13 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4667 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=1637, Invalid=21315, Unknown=0, NotChecked=0, Total=22952 [2022-11-22 02:30:59,923 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 322 mSDsluCounter, 1042 mSDsCounter, 0 mSdLazyCounter, 2852 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 1066 SdHoareTripleChecker+Invalid, 3010 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 2852 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:59,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [324 Valid, 1066 Invalid, 3010 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 2852 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-22 02:30:59,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-22 02:30:59,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 87. [2022-11-22 02:30:59,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 59 states have internal predecessors, (62), 10 states have call successors, (10), 4 states have call predecessors, (10), 18 states have return successors, (54), 23 states have call predecessors, (54), 10 states have call successors, (54) [2022-11-22 02:30:59,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 126 transitions. [2022-11-22 02:30:59,942 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 126 transitions. Word has length 131 [2022-11-22 02:30:59,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:59,943 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 126 transitions. [2022-11-22 02:30:59,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 86 states have (on average 1.430232558139535) internal successors, (123), 59 states have internal predecessors, (123), 20 states have call successors, (20), 1 states have call predecessors, (20), 29 states have return successors, (31), 31 states have call predecessors, (31), 20 states have call successors, (31) [2022-11-22 02:30:59,943 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 126 transitions. [2022-11-22 02:30:59,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-11-22 02:30:59,944 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:59,945 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 13, 13, 13, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:59,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:00,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-22 02:31:00,151 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:00,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:00,152 INFO L85 PathProgramCache]: Analyzing trace with hash 209449994, now seen corresponding path program 22 times [2022-11-22 02:31:00,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:00,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277088775] [2022-11-22 02:31:00,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:00,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:00,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:02,836 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 572 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2022-11-22 02:31:02,836 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:02,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277088775] [2022-11-22 02:31:02,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1277088775] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:02,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538692273] [2022-11-22 02:31:02,840 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:31:02,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:02,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:02,841 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:02,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-22 02:31:03,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:03,064 WARN L261 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 181 conjunts are in the unsatisfiable core [2022-11-22 02:31:03,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:05,931 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 11 proven. 321 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2022-11-22 02:31:05,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:15,045 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 44 proven. 528 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2022-11-22 02:31:15,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538692273] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:15,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [24438133] [2022-11-22 02:31:15,047 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:31:15,047 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:15,047 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:31:15,047 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:15,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 32, 48] total 113 [2022-11-22 02:31:15,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405981974] [2022-11-22 02:31:15,048 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:15,048 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-11-22 02:31:15,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:15,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-11-22 02:31:15,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=12269, Unknown=0, NotChecked=0, Total=12656 [2022-11-22 02:31:15,049 INFO L87 Difference]: Start difference. First operand 87 states and 126 transitions. Second operand has 113 states, 108 states have (on average 1.537037037037037) internal successors, (166), 71 states have internal predecessors, (166), 31 states have call successors, (31), 1 states have call predecessors, (31), 28 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) [2022-11-22 02:31:20,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:20,228 INFO L93 Difference]: Finished difference Result 107 states and 149 transitions. [2022-11-22 02:31:20,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-22 02:31:20,229 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 108 states have (on average 1.537037037037037) internal successors, (166), 71 states have internal predecessors, (166), 31 states have call successors, (31), 1 states have call predecessors, (31), 28 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) Word has length 110 [2022-11-22 02:31:20,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:20,230 INFO L225 Difference]: With dead ends: 107 [2022-11-22 02:31:20,230 INFO L226 Difference]: Without dead ends: 101 [2022-11-22 02:31:20,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 146 SyntacticMatches, 14 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4987 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=1702, Invalid=20054, Unknown=0, NotChecked=0, Total=21756 [2022-11-22 02:31:20,233 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 362 mSDsluCounter, 1036 mSDsCounter, 0 mSdLazyCounter, 3629 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 365 SdHoareTripleChecker+Valid, 1061 SdHoareTripleChecker+Invalid, 3844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 3629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:20,233 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [365 Valid, 1061 Invalid, 3844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 3629 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-11-22 02:31:20,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-22 02:31:20,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 85. [2022-11-22 02:31:20,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 58 states have internal predecessors, (61), 9 states have call successors, (9), 4 states have call predecessors, (9), 18 states have return successors, (47), 22 states have call predecessors, (47), 9 states have call successors, (47) [2022-11-22 02:31:20,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 117 transitions. [2022-11-22 02:31:20,252 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 117 transitions. Word has length 110 [2022-11-22 02:31:20,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:20,252 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 117 transitions. [2022-11-22 02:31:20,253 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 108 states have (on average 1.537037037037037) internal successors, (166), 71 states have internal predecessors, (166), 31 states have call successors, (31), 1 states have call predecessors, (31), 28 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) [2022-11-22 02:31:20,253 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 117 transitions. [2022-11-22 02:31:20,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-22 02:31:20,254 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:20,254 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 14, 14, 14, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:31:20,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:20,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:20,461 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:20,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:20,461 INFO L85 PathProgramCache]: Analyzing trace with hash -736446292, now seen corresponding path program 23 times [2022-11-22 02:31:20,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:20,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [960517098] [2022-11-22 02:31:20,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:20,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:20,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:23,344 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 658 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-22 02:31:23,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:23,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [960517098] [2022-11-22 02:31:23,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [960517098] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:23,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848033777] [2022-11-22 02:31:23,345 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:31:23,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:23,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:23,346 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:23,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-22 02:31:23,604 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-11-22 02:31:23,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:31:23,609 WARN L261 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 193 conjunts are in the unsatisfiable core [2022-11-22 02:31:23,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:26,338 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 5 proven. 366 refuted. 0 times theorem prover too weak. 411 trivial. 0 not checked. [2022-11-22 02:31:26,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:32,886 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1848033777] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:32,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1466149905] [2022-11-22 02:31:32,887 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:31:32,887 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:32,887 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:31:32,888 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:31:32,888 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 28] total 80 [2022-11-22 02:31:32,888 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420339015] [2022-11-22 02:31:32,888 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:32,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-11-22 02:31:32,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:32,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-11-22 02:31:32,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=9953, Unknown=0, NotChecked=0, Total=10302 [2022-11-22 02:31:32,890 INFO L87 Difference]: Start difference. First operand 85 states and 117 transitions. Second operand has 80 states, 76 states have (on average 1.4605263157894737) internal successors, (111), 53 states have internal predecessors, (111), 18 states have call successors, (18), 1 states have call predecessors, (18), 25 states have return successors, (27), 27 states have call predecessors, (27), 18 states have call successors, (27) [2022-11-22 02:31:36,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:36,061 INFO L93 Difference]: Finished difference Result 95 states and 127 transitions. [2022-11-22 02:31:36,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-22 02:31:36,062 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 76 states have (on average 1.4605263157894737) internal successors, (111), 53 states have internal predecessors, (111), 18 states have call successors, (18), 1 states have call predecessors, (18), 25 states have return successors, (27), 27 states have call predecessors, (27), 18 states have call successors, (27) Word has length 117 [2022-11-22 02:31:36,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:36,063 INFO L225 Difference]: With dead ends: 95 [2022-11-22 02:31:36,064 INFO L226 Difference]: Without dead ends: 91 [2022-11-22 02:31:36,065 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 121 SyntacticMatches, 9 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2727 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=1166, Invalid=14334, Unknown=0, NotChecked=0, Total=15500 [2022-11-22 02:31:36,066 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 383 mSDsluCounter, 757 mSDsCounter, 0 mSdLazyCounter, 2117 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 385 SdHoareTripleChecker+Valid, 778 SdHoareTripleChecker+Invalid, 2304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 2117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:36,066 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [385 Valid, 778 Invalid, 2304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 2117 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-22 02:31:36,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-22 02:31:36,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 85. [2022-11-22 02:31:36,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 58 states have internal predecessors, (61), 9 states have call successors, (9), 4 states have call predecessors, (9), 18 states have return successors, (47), 22 states have call predecessors, (47), 9 states have call successors, (47) [2022-11-22 02:31:36,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 117 transitions. [2022-11-22 02:31:36,084 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 117 transitions. Word has length 117 [2022-11-22 02:31:36,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:36,085 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 117 transitions. [2022-11-22 02:31:36,085 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 76 states have (on average 1.4605263157894737) internal successors, (111), 53 states have internal predecessors, (111), 18 states have call successors, (18), 1 states have call predecessors, (18), 25 states have return successors, (27), 27 states have call predecessors, (27), 18 states have call successors, (27) [2022-11-22 02:31:36,085 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 117 transitions. [2022-11-22 02:31:36,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-22 02:31:36,087 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:36,087 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 14, 14, 14, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:31:36,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:36,293 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-22 02:31:36,293 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:36,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:36,293 INFO L85 PathProgramCache]: Analyzing trace with hash 1925053130, now seen corresponding path program 24 times [2022-11-22 02:31:36,294 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:36,294 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875685522] [2022-11-22 02:31:36,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:36,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:36,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:31:39,260 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 658 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-22 02:31:39,260 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:31:39,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875685522] [2022-11-22 02:31:39,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875685522] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:31:39,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44411989] [2022-11-22 02:31:39,261 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:31:39,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:31:39,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:31:39,262 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:31:39,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-22 02:31:39,514 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:31:39,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:31:39,519 WARN L261 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 193 conjunts are in the unsatisfiable core [2022-11-22 02:31:39,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:31:42,701 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 12 proven. 367 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2022-11-22 02:31:42,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:31:52,766 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 47 proven. 611 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-22 02:31:52,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44411989] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:31:52,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2082889724] [2022-11-22 02:31:52,767 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:31:52,767 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:31:52,768 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:31:52,768 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:52,768 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 34, 51] total 120 [2022-11-22 02:31:52,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603224271] [2022-11-22 02:31:52,768 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:52,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2022-11-22 02:31:52,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:52,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2022-11-22 02:31:52,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=411, Invalid=13869, Unknown=0, NotChecked=0, Total=14280 [2022-11-22 02:31:52,771 INFO L87 Difference]: Start difference. First operand 85 states and 117 transitions. Second operand has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) [2022-11-22 02:31:58,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:31:58,543 INFO L93 Difference]: Finished difference Result 108 states and 151 transitions. [2022-11-22 02:31:58,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-22 02:31:58,543 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) Word has length 117 [2022-11-22 02:31:58,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:31:58,544 INFO L225 Difference]: With dead ends: 108 [2022-11-22 02:31:58,545 INFO L226 Difference]: Without dead ends: 102 [2022-11-22 02:31:58,547 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 155 SyntacticMatches, 15 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5637 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=1879, Invalid=22613, Unknown=0, NotChecked=0, Total=24492 [2022-11-22 02:31:58,548 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 469 mSDsluCounter, 1216 mSDsCounter, 0 mSdLazyCounter, 4299 mSolverCounterSat, 261 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 471 SdHoareTripleChecker+Valid, 1243 SdHoareTripleChecker+Invalid, 4560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 261 IncrementalHoareTripleChecker+Valid, 4299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:31:58,548 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [471 Valid, 1243 Invalid, 4560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [261 Valid, 4299 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-11-22 02:31:58,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-11-22 02:31:58,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 88. [2022-11-22 02:31:58,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 59 states have (on average 1.0677966101694916) internal successors, (63), 60 states have internal predecessors, (63), 9 states have call successors, (9), 4 states have call predecessors, (9), 19 states have return successors, (50), 23 states have call predecessors, (50), 9 states have call successors, (50) [2022-11-22 02:31:58,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 122 transitions. [2022-11-22 02:31:58,568 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 122 transitions. Word has length 117 [2022-11-22 02:31:58,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:31:58,568 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 122 transitions. [2022-11-22 02:31:58,568 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) [2022-11-22 02:31:58,569 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 122 transitions. [2022-11-22 02:31:58,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-22 02:31:58,570 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:31:58,570 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 15, 15, 15, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:31:58,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-22 02:31:58,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-22 02:31:58,779 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:31:58,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:31:58,779 INFO L85 PathProgramCache]: Analyzing trace with hash -124701254, now seen corresponding path program 25 times [2022-11-22 02:31:58,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:31:58,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848783072] [2022-11-22 02:31:58,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:31:58,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:31:58,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:32:01,980 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 1 proven. 746 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2022-11-22 02:32:01,980 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:32:01,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848783072] [2022-11-22 02:32:01,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [848783072] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:32:01,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248926294] [2022-11-22 02:32:01,980 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:32:01,980 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:32:01,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:32:01,981 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:32:01,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-22 02:32:02,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:32:02,246 WARN L261 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 205 conjunts are in the unsatisfiable core [2022-11-22 02:32:02,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:32:05,100 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 5 proven. 415 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2022-11-22 02:32:05,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:32:13,532 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 17 proven. 703 refuted. 0 times theorem prover too weak. 170 trivial. 0 not checked. [2022-11-22 02:32:13,533 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248926294] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:32:13,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318727192] [2022-11-22 02:32:13,534 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:32:13,534 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:32:13,534 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:32:13,534 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:32:13,535 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 30, 39] total 109 [2022-11-22 02:32:13,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687515418] [2022-11-22 02:32:13,535 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:32:13,535 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-11-22 02:32:13,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:32:13,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-11-22 02:32:13,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=11388, Unknown=0, NotChecked=0, Total=11772 [2022-11-22 02:32:13,537 INFO L87 Difference]: Start difference. First operand 88 states and 122 transitions. Second operand has 109 states, 104 states have (on average 1.5192307692307692) internal successors, (158), 69 states have internal predecessors, (158), 29 states have call successors, (29), 1 states have call predecessors, (29), 28 states have return successors, (41), 40 states have call predecessors, (41), 29 states have call successors, (41) [2022-11-22 02:32:18,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:32:18,083 INFO L93 Difference]: Finished difference Result 104 states and 153 transitions. [2022-11-22 02:32:18,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-22 02:32:18,083 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 104 states have (on average 1.5192307692307692) internal successors, (158), 69 states have internal predecessors, (158), 29 states have call successors, (29), 1 states have call predecessors, (29), 28 states have return successors, (41), 40 states have call predecessors, (41), 29 states have call successors, (41) Word has length 124 [2022-11-22 02:32:18,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:32:18,087 INFO L225 Difference]: With dead ends: 104 [2022-11-22 02:32:18,087 INFO L226 Difference]: Without dead ends: 98 [2022-11-22 02:32:18,089 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 182 SyntacticMatches, 16 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4287 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=1553, Invalid=18187, Unknown=0, NotChecked=0, Total=19740 [2022-11-22 02:32:18,089 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 354 mSDsluCounter, 749 mSDsCounter, 0 mSdLazyCounter, 3079 mSolverCounterSat, 304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 772 SdHoareTripleChecker+Invalid, 3383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 304 IncrementalHoareTripleChecker+Valid, 3079 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:32:18,090 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [356 Valid, 772 Invalid, 3383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [304 Valid, 3079 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-22 02:32:18,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-22 02:32:18,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 86. [2022-11-22 02:32:18,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 59 states have internal predecessors, (62), 8 states have call successors, (8), 4 states have call predecessors, (8), 19 states have return successors, (48), 22 states have call predecessors, (48), 8 states have call successors, (48) [2022-11-22 02:32:18,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 118 transitions. [2022-11-22 02:32:18,108 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 118 transitions. Word has length 124 [2022-11-22 02:32:18,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:32:18,109 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 118 transitions. [2022-11-22 02:32:18,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 104 states have (on average 1.5192307692307692) internal successors, (158), 69 states have internal predecessors, (158), 29 states have call successors, (29), 1 states have call predecessors, (29), 28 states have return successors, (41), 40 states have call predecessors, (41), 29 states have call successors, (41) [2022-11-22 02:32:18,109 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 118 transitions. [2022-11-22 02:32:18,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-11-22 02:32:18,110 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:32:18,111 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 20, 18, 18, 18, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:32:18,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-22 02:32:18,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-22 02:32:18,317 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:32:18,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:32:18,317 INFO L85 PathProgramCache]: Analyzing trace with hash -2124655988, now seen corresponding path program 26 times [2022-11-22 02:32:18,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:32:18,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134523868] [2022-11-22 02:32:18,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:32:18,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:32:18,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:32:22,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 0 proven. 1062 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2022-11-22 02:32:22,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:32:22,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134523868] [2022-11-22 02:32:22,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134523868] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:32:22,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [935491838] [2022-11-22 02:32:22,867 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:32:22,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:32:22,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:32:22,868 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:32:22,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-22 02:32:23,185 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-11-22 02:32:23,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:32:23,192 WARN L261 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 241 conjunts are in the unsatisfiable core [2022-11-22 02:32:23,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:32:26,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 27 proven. 562 refuted. 0 times theorem prover too weak. 667 trivial. 0 not checked. [2022-11-22 02:32:26,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:32:40,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [935491838] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:32:40,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [11576628] [2022-11-22 02:32:40,047 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:32:40,048 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:32:40,048 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:32:40,049 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:32:40,049 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 36] total 100 [2022-11-22 02:32:40,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960926219] [2022-11-22 02:32:40,049 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:32:40,050 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-11-22 02:32:40,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:32:40,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-11-22 02:32:40,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=18697, Unknown=0, NotChecked=0, Total=19182 [2022-11-22 02:32:40,053 INFO L87 Difference]: Start difference. First operand 86 states and 118 transitions. Second operand has 100 states, 96 states have (on average 1.4479166666666667) internal successors, (139), 65 states have internal predecessors, (139), 22 states have call successors, (22), 1 states have call predecessors, (22), 33 states have return successors, (35), 35 states have call predecessors, (35), 22 states have call successors, (35) [2022-11-22 02:32:44,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:32:44,711 INFO L93 Difference]: Finished difference Result 99 states and 138 transitions. [2022-11-22 02:32:44,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-22 02:32:44,711 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 96 states have (on average 1.4479166666666667) internal successors, (139), 65 states have internal predecessors, (139), 22 states have call successors, (22), 1 states have call predecessors, (22), 33 states have return successors, (35), 35 states have call predecessors, (35), 22 states have call successors, (35) Word has length 145 [2022-11-22 02:32:44,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:32:44,713 INFO L225 Difference]: With dead ends: 99 [2022-11-22 02:32:44,713 INFO L226 Difference]: Without dead ends: 95 [2022-11-22 02:32:44,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 172 SyntacticMatches, 17 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6041 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=1991, Invalid=26739, Unknown=0, NotChecked=0, Total=28730 [2022-11-22 02:32:44,715 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 519 mSDsluCounter, 1262 mSDsCounter, 0 mSdLazyCounter, 3644 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 521 SdHoareTripleChecker+Valid, 1287 SdHoareTripleChecker+Invalid, 3901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 3644 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:32:44,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [521 Valid, 1287 Invalid, 3901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 3644 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-22 02:32:44,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-22 02:32:44,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 91. [2022-11-22 02:32:44,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 61 states have (on average 1.0655737704918034) internal successors, (65), 62 states have internal predecessors, (65), 9 states have call successors, (9), 4 states have call predecessors, (9), 20 states have return successors, (57), 24 states have call predecessors, (57), 9 states have call successors, (57) [2022-11-22 02:32:44,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 131 transitions. [2022-11-22 02:32:44,737 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 131 transitions. Word has length 145 [2022-11-22 02:32:44,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:32:44,737 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 131 transitions. [2022-11-22 02:32:44,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 96 states have (on average 1.4479166666666667) internal successors, (139), 65 states have internal predecessors, (139), 22 states have call successors, (22), 1 states have call predecessors, (22), 33 states have return successors, (35), 35 states have call predecessors, (35), 22 states have call successors, (35) [2022-11-22 02:32:44,738 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 131 transitions. [2022-11-22 02:32:44,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-11-22 02:32:44,739 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:32:44,739 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 21, 19, 19, 19, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:32:44,750 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-22 02:32:44,946 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-22 02:32:44,946 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:32:44,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:32:44,946 INFO L85 PathProgramCache]: Analyzing trace with hash 2036987738, now seen corresponding path program 27 times [2022-11-22 02:32:44,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:32:44,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646988582] [2022-11-22 02:32:44,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:32:44,947 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:32:44,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:32:49,570 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 0 proven. 1178 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2022-11-22 02:32:49,570 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:32:49,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646988582] [2022-11-22 02:32:49,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1646988582] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:32:49,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766724473] [2022-11-22 02:32:49,571 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:32:49,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:32:49,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:32:49,572 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:32:49,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-22 02:32:49,886 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:32:49,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:32:49,891 WARN L261 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 253 conjunts are in the unsatisfiable core [2022-11-22 02:32:49,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:32:54,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 13 proven. 634 refuted. 0 times theorem prover too weak. 745 trivial. 0 not checked. [2022-11-22 02:32:54,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:33:08,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766724473] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:33:08,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [195536047] [2022-11-22 02:33:08,119 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:33:08,119 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:33:08,119 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:33:08,120 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:33:08,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 36] total 103 [2022-11-22 02:33:08,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703849570] [2022-11-22 02:33:08,121 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:33:08,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-22 02:33:08,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:33:08,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-22 02:33:08,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=497, Invalid=19525, Unknown=0, NotChecked=0, Total=20022 [2022-11-22 02:33:08,124 INFO L87 Difference]: Start difference. First operand 91 states and 131 transitions. Second operand has 103 states, 99 states have (on average 1.4343434343434343) internal successors, (142), 67 states have internal predecessors, (142), 23 states have call successors, (23), 1 states have call predecessors, (23), 34 states have return successors, (36), 36 states have call predecessors, (36), 23 states have call successors, (36) [2022-11-22 02:33:13,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:33:13,183 INFO L93 Difference]: Finished difference Result 101 states and 141 transitions. [2022-11-22 02:33:13,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-22 02:33:13,183 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 99 states have (on average 1.4343434343434343) internal successors, (142), 67 states have internal predecessors, (142), 23 states have call successors, (23), 1 states have call predecessors, (23), 34 states have return successors, (36), 36 states have call predecessors, (36), 23 states have call successors, (36) Word has length 152 [2022-11-22 02:33:13,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:33:13,185 INFO L225 Difference]: With dead ends: 101 [2022-11-22 02:33:13,185 INFO L226 Difference]: Without dead ends: 97 [2022-11-22 02:33:13,188 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 181 SyntacticMatches, 15 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5964 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=2034, Invalid=27722, Unknown=0, NotChecked=0, Total=29756 [2022-11-22 02:33:13,188 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 581 mSDsluCounter, 1278 mSDsCounter, 0 mSdLazyCounter, 3482 mSolverCounterSat, 287 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 583 SdHoareTripleChecker+Valid, 1304 SdHoareTripleChecker+Invalid, 3769 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 287 IncrementalHoareTripleChecker+Valid, 3482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:33:13,189 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [583 Valid, 1304 Invalid, 3769 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [287 Valid, 3482 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-22 02:33:13,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-11-22 02:33:13,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 91. [2022-11-22 02:33:13,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 61 states have (on average 1.0655737704918034) internal successors, (65), 62 states have internal predecessors, (65), 9 states have call successors, (9), 4 states have call predecessors, (9), 20 states have return successors, (57), 24 states have call predecessors, (57), 9 states have call successors, (57) [2022-11-22 02:33:13,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 131 transitions. [2022-11-22 02:33:13,211 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 131 transitions. Word has length 152 [2022-11-22 02:33:13,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:33:13,211 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 131 transitions. [2022-11-22 02:33:13,212 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 99 states have (on average 1.4343434343434343) internal successors, (142), 67 states have internal predecessors, (142), 23 states have call successors, (23), 1 states have call predecessors, (23), 34 states have return successors, (36), 36 states have call predecessors, (36), 23 states have call successors, (36) [2022-11-22 02:33:13,212 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 131 transitions. [2022-11-22 02:33:13,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-22 02:33:13,213 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:33:13,213 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 15, 15, 15, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:33:13,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-22 02:33:13,420 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:33:13,420 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:33:13,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:33:13,421 INFO L85 PathProgramCache]: Analyzing trace with hash 430880826, now seen corresponding path program 28 times [2022-11-22 02:33:13,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:33:13,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934326523] [2022-11-22 02:33:13,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:33:13,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:33:13,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:33:16,434 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2022-11-22 02:33:16,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:33:16,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934326523] [2022-11-22 02:33:16,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934326523] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:33:16,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329114169] [2022-11-22 02:33:16,435 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:33:16,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:33:16,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:33:16,436 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:33:16,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-22 02:33:16,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:33:16,761 WARN L261 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 205 conjunts are in the unsatisfiable core [2022-11-22 02:33:16,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:33:20,223 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 13 proven. 416 refuted. 0 times theorem prover too weak. 461 trivial. 0 not checked. [2022-11-22 02:33:20,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:33:31,473 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 50 proven. 700 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2022-11-22 02:33:31,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329114169] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:33:31,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [718354906] [2022-11-22 02:33:31,474 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:33:31,474 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:33:31,475 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:33:31,476 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:33:31,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 36, 54] total 127 [2022-11-22 02:33:31,476 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347313938] [2022-11-22 02:33:31,476 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:33:31,477 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2022-11-22 02:33:31,477 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:33:31,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2022-11-22 02:33:31,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=15567, Unknown=0, NotChecked=0, Total=16002 [2022-11-22 02:33:31,481 INFO L87 Difference]: Start difference. First operand 91 states and 131 transitions. Second operand has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) [2022-11-22 02:33:37,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:33:37,720 INFO L93 Difference]: Finished difference Result 107 states and 151 transitions. [2022-11-22 02:33:37,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-22 02:33:37,721 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) Word has length 124 [2022-11-22 02:33:37,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:33:37,722 INFO L225 Difference]: With dead ends: 107 [2022-11-22 02:33:37,722 INFO L226 Difference]: Without dead ends: 101 [2022-11-22 02:33:37,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 164 SyntacticMatches, 16 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6235 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=2060, Invalid=25000, Unknown=0, NotChecked=0, Total=27060 [2022-11-22 02:33:37,724 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 1094 mSDsluCounter, 1110 mSDsCounter, 0 mSdLazyCounter, 4314 mSolverCounterSat, 596 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1096 SdHoareTripleChecker+Valid, 1136 SdHoareTripleChecker+Invalid, 4910 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 596 IncrementalHoareTripleChecker+Valid, 4314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:33:37,724 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1096 Valid, 1136 Invalid, 4910 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [596 Valid, 4314 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-11-22 02:33:37,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-22 02:33:37,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 89. [2022-11-22 02:33:37,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 8 states have call successors, (8), 4 states have call predecessors, (8), 20 states have return successors, (51), 23 states have call predecessors, (51), 8 states have call successors, (51) [2022-11-22 02:33:37,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 123 transitions. [2022-11-22 02:33:37,740 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 123 transitions. Word has length 124 [2022-11-22 02:33:37,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:33:37,740 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 123 transitions. [2022-11-22 02:33:37,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) [2022-11-22 02:33:37,740 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 123 transitions. [2022-11-22 02:33:37,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-22 02:33:37,742 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:33:37,742 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 16, 16, 16, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:33:37,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-22 02:33:37,950 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-11-22 02:33:37,951 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:33:37,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:33:37,951 INFO L85 PathProgramCache]: Analyzing trace with hash 2065134234, now seen corresponding path program 29 times [2022-11-22 02:33:37,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:33:37,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666504290] [2022-11-22 02:33:37,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:33:37,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:33:37,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:33:41,605 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 0 proven. 848 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2022-11-22 02:33:41,605 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:33:41,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666504290] [2022-11-22 02:33:41,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1666504290] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:33:41,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131549217] [2022-11-22 02:33:41,606 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:33:41,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:33:41,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:33:41,607 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:33:41,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-22 02:33:41,979 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-11-22 02:33:41,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:33:41,986 WARN L261 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 217 conjunts are in the unsatisfiable core [2022-11-22 02:33:41,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:33:45,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 14 proven. 468 refuted. 0 times theorem prover too weak. 523 trivial. 0 not checked. [2022-11-22 02:33:45,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:33:58,433 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 53 proven. 795 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2022-11-22 02:33:58,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2131549217] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:33:58,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1411015233] [2022-11-22 02:33:58,435 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:33:58,435 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:33:58,435 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:33:58,435 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:33:58,435 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 38, 57] total 134 [2022-11-22 02:33:58,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842806357] [2022-11-22 02:33:58,436 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:33:58,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2022-11-22 02:33:58,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:33:58,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2022-11-22 02:33:58,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=17363, Unknown=0, NotChecked=0, Total=17822 [2022-11-22 02:33:58,438 INFO L87 Difference]: Start difference. First operand 89 states and 123 transitions. Second operand has 134 states, 129 states have (on average 1.5426356589147288) internal successors, (199), 83 states have internal predecessors, (199), 37 states have call successors, (37), 1 states have call predecessors, (37), 34 states have return successors, (52), 51 states have call predecessors, (52), 37 states have call successors, (52) [2022-11-22 02:34:05,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:34:05,040 INFO L93 Difference]: Finished difference Result 108 states and 153 transitions. [2022-11-22 02:34:05,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-22 02:34:05,040 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 129 states have (on average 1.5426356589147288) internal successors, (199), 83 states have internal predecessors, (199), 37 states have call successors, (37), 1 states have call predecessors, (37), 34 states have return successors, (52), 51 states have call predecessors, (52), 37 states have call successors, (52) Word has length 131 [2022-11-22 02:34:05,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:34:05,042 INFO L225 Difference]: With dead ends: 108 [2022-11-22 02:34:05,042 INFO L226 Difference]: Without dead ends: 102 [2022-11-22 02:34:05,044 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 173 SyntacticMatches, 17 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6959 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=2253, Invalid=27849, Unknown=0, NotChecked=0, Total=30102 [2022-11-22 02:34:05,045 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 468 mSDsluCounter, 1416 mSDsCounter, 0 mSdLazyCounter, 5058 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 470 SdHoareTripleChecker+Valid, 1443 SdHoareTripleChecker+Invalid, 5318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 5058 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:34:05,045 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [470 Valid, 1443 Invalid, 5318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [260 Valid, 5058 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-11-22 02:34:05,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-11-22 02:34:05,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 92. [2022-11-22 02:34:05,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 62 states have (on average 1.064516129032258) internal successors, (66), 63 states have internal predecessors, (66), 8 states have call successors, (8), 4 states have call predecessors, (8), 21 states have return successors, (54), 24 states have call predecessors, (54), 8 states have call successors, (54) [2022-11-22 02:34:05,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 128 transitions. [2022-11-22 02:34:05,065 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 128 transitions. Word has length 131 [2022-11-22 02:34:05,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:34:05,066 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 128 transitions. [2022-11-22 02:34:05,066 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 129 states have (on average 1.5426356589147288) internal successors, (199), 83 states have internal predecessors, (199), 37 states have call successors, (37), 1 states have call predecessors, (37), 34 states have return successors, (52), 51 states have call predecessors, (52), 37 states have call successors, (52) [2022-11-22 02:34:05,066 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 128 transitions. [2022-11-22 02:34:05,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-11-22 02:34:05,068 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:34:05,068 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 19, 17, 17, 17, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:34:05,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-22 02:34:05,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-11-22 02:34:05,274 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:34:05,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:34:05,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1491843990, now seen corresponding path program 30 times [2022-11-22 02:34:05,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:34:05,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018875885] [2022-11-22 02:34:05,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:34:05,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:34:05,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:34:09,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 0 proven. 952 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2022-11-22 02:34:09,034 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:34:09,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018875885] [2022-11-22 02:34:09,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018875885] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:34:09,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061885246] [2022-11-22 02:34:09,034 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:34:09,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:34:09,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:34:09,035 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:34:09,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-22 02:34:09,407 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:34:09,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:34:09,413 WARN L261 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 229 conjunts are in the unsatisfiable core [2022-11-22 02:34:09,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:34:13,617 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 15 proven. 523 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2022-11-22 02:34:13,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:34:27,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 56 proven. 896 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2022-11-22 02:34:27,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1061885246] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:34:27,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [217832119] [2022-11-22 02:34:27,590 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:34:27,590 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:34:27,590 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:34:27,591 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:34:27,592 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 40, 60] total 141 [2022-11-22 02:34:27,592 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794461989] [2022-11-22 02:34:27,592 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:34:27,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2022-11-22 02:34:27,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:34:27,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2022-11-22 02:34:27,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=19257, Unknown=0, NotChecked=0, Total=19740 [2022-11-22 02:34:27,595 INFO L87 Difference]: Start difference. First operand 92 states and 128 transitions. Second operand has 141 states, 136 states have (on average 1.5441176470588236) internal successors, (210), 87 states have internal predecessors, (210), 39 states have call successors, (39), 1 states have call predecessors, (39), 36 states have return successors, (55), 54 states have call predecessors, (55), 39 states have call successors, (55) [2022-11-22 02:34:34,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:34:34,427 INFO L93 Difference]: Finished difference Result 111 states and 158 transitions. [2022-11-22 02:34:34,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-22 02:34:34,427 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 136 states have (on average 1.5441176470588236) internal successors, (210), 87 states have internal predecessors, (210), 39 states have call successors, (39), 1 states have call predecessors, (39), 36 states have return successors, (55), 54 states have call predecessors, (55), 39 states have call successors, (55) Word has length 138 [2022-11-22 02:34:34,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:34:34,429 INFO L225 Difference]: With dead ends: 111 [2022-11-22 02:34:34,429 INFO L226 Difference]: Without dead ends: 105 [2022-11-22 02:34:34,432 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 182 SyntacticMatches, 18 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7723 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=2454, Invalid=30852, Unknown=0, NotChecked=0, Total=33306 [2022-11-22 02:34:34,433 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 1243 mSDsluCounter, 1172 mSDsCounter, 0 mSdLazyCounter, 4593 mSolverCounterSat, 708 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1245 SdHoareTripleChecker+Valid, 1199 SdHoareTripleChecker+Invalid, 5301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 708 IncrementalHoareTripleChecker+Valid, 4593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:34:34,433 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1245 Valid, 1199 Invalid, 5301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [708 Valid, 4593 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-11-22 02:34:34,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-11-22 02:34:34,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 95. [2022-11-22 02:34:34,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 64 states have (on average 1.0625) internal successors, (68), 65 states have internal predecessors, (68), 8 states have call successors, (8), 4 states have call predecessors, (8), 22 states have return successors, (57), 25 states have call predecessors, (57), 8 states have call successors, (57) [2022-11-22 02:34:34,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 133 transitions. [2022-11-22 02:34:34,455 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 133 transitions. Word has length 138 [2022-11-22 02:34:34,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:34:34,456 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 133 transitions. [2022-11-22 02:34:34,456 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 141 states, 136 states have (on average 1.5441176470588236) internal successors, (210), 87 states have internal predecessors, (210), 39 states have call successors, (39), 1 states have call predecessors, (39), 36 states have return successors, (55), 54 states have call predecessors, (55), 39 states have call successors, (55) [2022-11-22 02:34:34,456 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 133 transitions. [2022-11-22 02:34:34,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2022-11-22 02:34:34,457 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:34:34,458 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 23, 21, 21, 21, 21, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:34:34,466 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-11-22 02:34:34,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:34:34,664 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:34:34,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:34:34,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1184108376, now seen corresponding path program 31 times [2022-11-22 02:34:34,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:34:34,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035549634] [2022-11-22 02:34:34,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:34:34,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:34:34,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:34:40,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1685 backedges. 0 proven. 1428 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2022-11-22 02:34:40,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:34:40,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035549634] [2022-11-22 02:34:40,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035549634] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:34:40,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433674148] [2022-11-22 02:34:40,080 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:34:40,080 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:34:40,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:34:40,087 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:34:40,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-22 02:34:40,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:34:40,505 WARN L261 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 277 conjunts are in the unsatisfiable core [2022-11-22 02:34:40,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:34:45,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1685 backedges. 16 proven. 767 refuted. 0 times theorem prover too weak. 902 trivial. 0 not checked. [2022-11-22 02:34:45,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:35:03,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [433674148] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:35:03,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1188175908] [2022-11-22 02:35:03,932 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:35:03,933 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:35:03,933 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:35:03,933 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:35:03,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 42] total 115 [2022-11-22 02:35:03,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936305417] [2022-11-22 02:35:03,933 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:35:03,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2022-11-22 02:35:03,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:35:03,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2022-11-22 02:35:03,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=24883, Unknown=0, NotChecked=0, Total=25440 [2022-11-22 02:35:03,936 INFO L87 Difference]: Start difference. First operand 95 states and 133 transitions. Second operand has 115 states, 111 states have (on average 1.4234234234234233) internal successors, (158), 74 states have internal predecessors, (158), 25 states have call successors, (25), 1 states have call predecessors, (25), 39 states have return successors, (41), 41 states have call predecessors, (41), 25 states have call successors, (41) [2022-11-22 02:35:10,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:35:10,508 INFO L93 Difference]: Finished difference Result 108 states and 153 transitions. [2022-11-22 02:35:10,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-22 02:35:10,508 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 111 states have (on average 1.4234234234234233) internal successors, (158), 74 states have internal predecessors, (158), 25 states have call successors, (25), 1 states have call predecessors, (25), 39 states have return successors, (41), 41 states have call predecessors, (41), 25 states have call successors, (41) Word has length 166 [2022-11-22 02:35:10,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:35:10,509 INFO L225 Difference]: With dead ends: 108 [2022-11-22 02:35:10,510 INFO L226 Difference]: Without dead ends: 104 [2022-11-22 02:35:10,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 201 SyntacticMatches, 18 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8192 ImplicationChecksByTransitivity, 21.1s TimeCoverageRelationStatistics Valid=2582, Invalid=36030, Unknown=0, NotChecked=0, Total=38612 [2022-11-22 02:35:10,512 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 477 mSDsluCounter, 1543 mSDsCounter, 0 mSdLazyCounter, 4991 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 478 SdHoareTripleChecker+Valid, 1570 SdHoareTripleChecker+Invalid, 5225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 4991 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:35:10,513 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [478 Valid, 1570 Invalid, 5225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 4991 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-11-22 02:35:10,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-11-22 02:35:10,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 100. [2022-11-22 02:35:10,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 67 states have (on average 1.0597014925373134) internal successors, (71), 68 states have internal predecessors, (71), 9 states have call successors, (9), 4 states have call predecessors, (9), 23 states have return successors, (66), 27 states have call predecessors, (66), 9 states have call successors, (66) [2022-11-22 02:35:10,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 146 transitions. [2022-11-22 02:35:10,537 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 146 transitions. Word has length 166 [2022-11-22 02:35:10,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:35:10,538 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 146 transitions. [2022-11-22 02:35:10,538 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 111 states have (on average 1.4234234234234233) internal successors, (158), 74 states have internal predecessors, (158), 25 states have call successors, (25), 1 states have call predecessors, (25), 39 states have return successors, (41), 41 states have call predecessors, (41), 25 states have call successors, (41) [2022-11-22 02:35:10,538 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 146 transitions. [2022-11-22 02:35:10,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2022-11-22 02:35:10,539 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:35:10,540 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 20, 18, 18, 18, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:35:10,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-22 02:35:10,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:35:10,755 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:35:10,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:35:10,755 INFO L85 PathProgramCache]: Analyzing trace with hash -1492671894, now seen corresponding path program 32 times [2022-11-22 02:35:10,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:35:10,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101530089] [2022-11-22 02:35:10,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:35:10,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:35:10,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:35:14,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 0 proven. 1062 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2022-11-22 02:35:14,920 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:35:14,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101530089] [2022-11-22 02:35:14,920 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101530089] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:35:14,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373838410] [2022-11-22 02:35:14,921 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:35:14,921 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:35:14,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:35:14,926 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:35:14,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-22 02:35:15,380 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-11-22 02:35:15,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:35:15,385 WARN L261 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 241 conjunts are in the unsatisfiable core [2022-11-22 02:35:15,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:35:19,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 16 proven. 581 refuted. 0 times theorem prover too weak. 659 trivial. 0 not checked. [2022-11-22 02:35:19,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:35:35,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 59 proven. 1003 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2022-11-22 02:35:35,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [373838410] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:35:35,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1407380062] [2022-11-22 02:35:35,359 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:35:35,359 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:35:35,359 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:35:35,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:35:35,361 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 42, 63] total 148 [2022-11-22 02:35:35,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680164332] [2022-11-22 02:35:35,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:35:35,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2022-11-22 02:35:35,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:35:35,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2022-11-22 02:35:35,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=21249, Unknown=0, NotChecked=0, Total=21756 [2022-11-22 02:35:35,363 INFO L87 Difference]: Start difference. First operand 100 states and 146 transitions. Second operand has 148 states, 143 states have (on average 1.5454545454545454) internal successors, (221), 91 states have internal predecessors, (221), 41 states have call successors, (41), 1 states have call predecessors, (41), 38 states have return successors, (58), 57 states have call predecessors, (58), 41 states have call successors, (58) [2022-11-22 02:35:42,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:35:42,566 INFO L93 Difference]: Finished difference Result 116 states and 166 transitions. [2022-11-22 02:35:42,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-22 02:35:42,567 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 143 states have (on average 1.5454545454545454) internal successors, (221), 91 states have internal predecessors, (221), 41 states have call successors, (41), 1 states have call predecessors, (41), 38 states have return successors, (58), 57 states have call predecessors, (58), 41 states have call successors, (58) Word has length 145 [2022-11-22 02:35:42,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:35:42,567 INFO L225 Difference]: With dead ends: 116 [2022-11-22 02:35:42,567 INFO L226 Difference]: Without dead ends: 110 [2022-11-22 02:35:42,570 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 191 SyntacticMatches, 19 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8528 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=2663, Invalid=34009, Unknown=0, NotChecked=0, Total=36672 [2022-11-22 02:35:42,571 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 992 mSDsluCounter, 1462 mSDsCounter, 0 mSdLazyCounter, 5295 mSolverCounterSat, 565 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 994 SdHoareTripleChecker+Valid, 1490 SdHoareTripleChecker+Invalid, 5860 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 565 IncrementalHoareTripleChecker+Valid, 5295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:35:42,571 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [994 Valid, 1490 Invalid, 5860 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [565 Valid, 5295 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-22 02:35:42,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-22 02:35:42,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2022-11-22 02:35:42,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 67 states have internal predecessors, (70), 8 states have call successors, (8), 4 states have call predecessors, (8), 23 states have return successors, (60), 26 states have call predecessors, (60), 8 states have call successors, (60) [2022-11-22 02:35:42,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 138 transitions. [2022-11-22 02:35:42,594 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 138 transitions. Word has length 145 [2022-11-22 02:35:42,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:35:42,594 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 138 transitions. [2022-11-22 02:35:42,594 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 143 states have (on average 1.5454545454545454) internal successors, (221), 91 states have internal predecessors, (221), 41 states have call successors, (41), 1 states have call predecessors, (41), 38 states have return successors, (58), 57 states have call predecessors, (58), 41 states have call successors, (58) [2022-11-22 02:35:42,595 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 138 transitions. [2022-11-22 02:35:42,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-11-22 02:35:42,596 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:35:42,596 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 24, 22, 22, 22, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:35:42,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-22 02:35:42,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-22 02:35:42,807 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:35:42,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:35:42,807 INFO L85 PathProgramCache]: Analyzing trace with hash -594320404, now seen corresponding path program 33 times [2022-11-22 02:35:42,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:35:42,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915175094] [2022-11-22 02:35:42,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:35:42,808 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:35:42,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:35:48,572 INFO L134 CoverageAnalysis]: Checked inductivity of 1842 backedges. 0 proven. 1562 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2022-11-22 02:35:48,572 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:35:48,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915175094] [2022-11-22 02:35:48,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915175094] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:35:48,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984501210] [2022-11-22 02:35:48,573 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:35:48,573 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:35:48,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:35:48,574 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:35:48,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-22 02:35:49,054 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:35:49,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:35:49,060 WARN L261 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 289 conjunts are in the unsatisfiable core [2022-11-22 02:35:49,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:35:54,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1842 backedges. 17 proven. 837 refuted. 0 times theorem prover too weak. 988 trivial. 0 not checked. [2022-11-22 02:35:54,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:36:15,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984501210] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:36:15,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1702998346] [2022-11-22 02:36:15,263 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:36:15,263 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:36:15,263 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:36:15,263 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:36:15,263 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 44] total 120 [2022-11-22 02:36:15,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719890525] [2022-11-22 02:36:15,264 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:36:15,264 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2022-11-22 02:36:15,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:36:15,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2022-11-22 02:36:15,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=581, Invalid=27141, Unknown=0, NotChecked=0, Total=27722 [2022-11-22 02:36:15,266 INFO L87 Difference]: Start difference. First operand 98 states and 138 transitions. Second operand has 120 states, 116 states have (on average 1.4224137931034482) internal successors, (165), 77 states have internal predecessors, (165), 26 states have call successors, (26), 1 states have call predecessors, (26), 41 states have return successors, (43), 43 states have call predecessors, (43), 26 states have call successors, (43) [2022-11-22 02:36:22,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:36:22,146 INFO L93 Difference]: Finished difference Result 111 states and 158 transitions. [2022-11-22 02:36:22,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-22 02:36:22,146 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 116 states have (on average 1.4224137931034482) internal successors, (165), 77 states have internal predecessors, (165), 26 states have call successors, (26), 1 states have call predecessors, (26), 41 states have return successors, (43), 43 states have call predecessors, (43), 26 states have call successors, (43) Word has length 173 [2022-11-22 02:36:22,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:36:22,148 INFO L225 Difference]: With dead ends: 111 [2022-11-22 02:36:22,148 INFO L226 Difference]: Without dead ends: 107 [2022-11-22 02:36:22,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 210 SyntacticMatches, 19 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9017 ImplicationChecksByTransitivity, 23.0s TimeCoverageRelationStatistics Valid=2795, Invalid=39435, Unknown=0, NotChecked=0, Total=42230 [2022-11-22 02:36:22,152 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 851 mSDsluCounter, 1623 mSDsCounter, 0 mSdLazyCounter, 4820 mSolverCounterSat, 420 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 853 SdHoareTripleChecker+Valid, 1652 SdHoareTripleChecker+Invalid, 5240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 420 IncrementalHoareTripleChecker+Valid, 4820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:36:22,152 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [853 Valid, 1652 Invalid, 5240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [420 Valid, 4820 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-11-22 02:36:22,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-11-22 02:36:22,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 103. [2022-11-22 02:36:22,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 69 states have (on average 1.0579710144927537) internal successors, (73), 70 states have internal predecessors, (73), 9 states have call successors, (9), 4 states have call predecessors, (9), 24 states have return successors, (69), 28 states have call predecessors, (69), 9 states have call successors, (69) [2022-11-22 02:36:22,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 151 transitions. [2022-11-22 02:36:22,177 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 151 transitions. Word has length 173 [2022-11-22 02:36:22,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:36:22,178 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 151 transitions. [2022-11-22 02:36:22,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 116 states have (on average 1.4224137931034482) internal successors, (165), 77 states have internal predecessors, (165), 26 states have call successors, (26), 1 states have call predecessors, (26), 41 states have return successors, (43), 43 states have call predecessors, (43), 26 states have call successors, (43) [2022-11-22 02:36:22,178 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 151 transitions. [2022-11-22 02:36:22,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-11-22 02:36:22,180 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:36:22,180 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 21, 19, 19, 19, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:36:22,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-22 02:36:22,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:36:22,391 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:36:22,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:36:22,391 INFO L85 PathProgramCache]: Analyzing trace with hash 1062836378, now seen corresponding path program 34 times [2022-11-22 02:36:22,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:36:22,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029130948] [2022-11-22 02:36:22,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:36:22,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:36:22,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:36:26,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 0 proven. 1178 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2022-11-22 02:36:26,836 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:36:26,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029130948] [2022-11-22 02:36:26,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029130948] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:36:26,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057904532] [2022-11-22 02:36:26,837 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:36:26,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:36:26,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:36:26,839 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:36:26,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-22 02:36:27,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:36:27,335 WARN L261 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 253 conjunts are in the unsatisfiable core [2022-11-22 02:36:27,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:36:32,324 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 17 proven. 642 refuted. 0 times theorem prover too weak. 733 trivial. 0 not checked. [2022-11-22 02:36:32,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:36:49,561 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 62 proven. 1116 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2022-11-22 02:36:49,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057904532] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:36:49,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2007252731] [2022-11-22 02:36:49,563 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:36:49,563 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:36:49,563 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:36:49,564 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:36:49,564 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 44, 66] total 155 [2022-11-22 02:36:49,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637957673] [2022-11-22 02:36:49,565 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:36:49,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2022-11-22 02:36:49,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:36:49,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2022-11-22 02:36:49,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=531, Invalid=23339, Unknown=0, NotChecked=0, Total=23870 [2022-11-22 02:36:49,568 INFO L87 Difference]: Start difference. First operand 103 states and 151 transitions. Second operand has 155 states, 150 states have (on average 1.5466666666666666) internal successors, (232), 95 states have internal predecessors, (232), 43 states have call successors, (43), 1 states have call predecessors, (43), 40 states have return successors, (61), 60 states have call predecessors, (61), 43 states have call successors, (61) [2022-11-22 02:36:57,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:36:57,635 INFO L93 Difference]: Finished difference Result 119 states and 171 transitions. [2022-11-22 02:36:57,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-22 02:36:57,635 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 150 states have (on average 1.5466666666666666) internal successors, (232), 95 states have internal predecessors, (232), 43 states have call successors, (43), 1 states have call predecessors, (43), 40 states have return successors, (61), 60 states have call predecessors, (61), 43 states have call successors, (61) Word has length 152 [2022-11-22 02:36:57,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:36:57,637 INFO L225 Difference]: With dead ends: 119 [2022-11-22 02:36:57,637 INFO L226 Difference]: Without dead ends: 113 [2022-11-22 02:36:57,640 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 200 SyntacticMatches, 20 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9372 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=2880, Invalid=37320, Unknown=0, NotChecked=0, Total=40200 [2022-11-22 02:36:57,640 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 740 mSDsluCounter, 1661 mSDsCounter, 0 mSdLazyCounter, 5917 mSolverCounterSat, 406 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 742 SdHoareTripleChecker+Valid, 1691 SdHoareTripleChecker+Invalid, 6323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 406 IncrementalHoareTripleChecker+Valid, 5917 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:36:57,640 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [742 Valid, 1691 Invalid, 6323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [406 Valid, 5917 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2022-11-22 02:36:57,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-22 02:36:57,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 101. [2022-11-22 02:36:57,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 68 states have (on average 1.0588235294117647) internal successors, (72), 69 states have internal predecessors, (72), 8 states have call successors, (8), 4 states have call predecessors, (8), 24 states have return successors, (63), 27 states have call predecessors, (63), 8 states have call successors, (63) [2022-11-22 02:36:57,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 143 transitions. [2022-11-22 02:36:57,663 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 143 transitions. Word has length 152 [2022-11-22 02:36:57,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:36:57,664 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 143 transitions. [2022-11-22 02:36:57,664 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 150 states have (on average 1.5466666666666666) internal successors, (232), 95 states have internal predecessors, (232), 43 states have call successors, (43), 1 states have call predecessors, (43), 40 states have return successors, (61), 60 states have call predecessors, (61), 43 states have call successors, (61) [2022-11-22 02:36:57,664 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 143 transitions. [2022-11-22 02:36:57,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2022-11-22 02:36:57,665 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:36:57,666 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 25, 23, 23, 23, 23, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:36:57,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-22 02:36:57,877 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-22 02:36:57,878 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:36:57,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:36:57,878 INFO L85 PathProgramCache]: Analyzing trace with hash 247316136, now seen corresponding path program 35 times [2022-11-22 02:36:57,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:36:57,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504048173] [2022-11-22 02:36:57,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:36:57,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:36:57,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:37:04,273 INFO L134 CoverageAnalysis]: Checked inductivity of 2006 backedges. 0 proven. 1702 refuted. 0 times theorem prover too weak. 304 trivial. 0 not checked. [2022-11-22 02:37:04,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:37:04,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504048173] [2022-11-22 02:37:04,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504048173] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:37:04,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744329883] [2022-11-22 02:37:04,274 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:37:04,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:37:04,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:37:04,275 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:37:04,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-22 02:37:04,879 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2022-11-22 02:37:04,879 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:37:04,889 WARN L261 TraceCheckSpWp]: Trace formula consists of 520 conjuncts, 301 conjunts are in the unsatisfiable core [2022-11-22 02:37:04,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:37:10,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2006 backedges. 18 proven. 910 refuted. 0 times theorem prover too weak. 1078 trivial. 0 not checked. [2022-11-22 02:37:10,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:37:32,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744329883] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:37:32,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [430204537] [2022-11-22 02:37:32,512 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:37:32,513 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:37:32,513 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:37:32,514 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:37:32,514 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 46] total 125 [2022-11-22 02:37:32,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288089755] [2022-11-22 02:37:32,514 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:37:32,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-11-22 02:37:32,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:37:32,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-11-22 02:37:32,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=29497, Unknown=0, NotChecked=0, Total=30102 [2022-11-22 02:37:32,517 INFO L87 Difference]: Start difference. First operand 101 states and 143 transitions. Second operand has 125 states, 121 states have (on average 1.421487603305785) internal successors, (172), 80 states have internal predecessors, (172), 27 states have call successors, (27), 1 states have call predecessors, (27), 43 states have return successors, (45), 45 states have call predecessors, (45), 27 states have call successors, (45) [2022-11-22 02:37:40,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:37:40,341 INFO L93 Difference]: Finished difference Result 114 states and 163 transitions. [2022-11-22 02:37:40,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-22 02:37:40,341 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 121 states have (on average 1.421487603305785) internal successors, (172), 80 states have internal predecessors, (172), 27 states have call successors, (27), 1 states have call predecessors, (27), 43 states have return successors, (45), 45 states have call predecessors, (45), 27 states have call successors, (45) Word has length 180 [2022-11-22 02:37:40,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:37:40,343 INFO L225 Difference]: With dead ends: 114 [2022-11-22 02:37:40,343 INFO L226 Difference]: Without dead ends: 110 [2022-11-22 02:37:40,345 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 219 SyntacticMatches, 20 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9882 ImplicationChecksByTransitivity, 24.5s TimeCoverageRelationStatistics Valid=3016, Invalid=42994, Unknown=0, NotChecked=0, Total=46010 [2022-11-22 02:37:40,346 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 655 mSDsluCounter, 1801 mSDsCounter, 0 mSdLazyCounter, 5822 mSolverCounterSat, 321 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 656 SdHoareTripleChecker+Valid, 1830 SdHoareTripleChecker+Invalid, 6143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 321 IncrementalHoareTripleChecker+Valid, 5822 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:37:40,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [656 Valid, 1830 Invalid, 6143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [321 Valid, 5822 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-11-22 02:37:40,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-11-22 02:37:40,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 106. [2022-11-22 02:37:40,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 71 states have (on average 1.056338028169014) internal successors, (75), 72 states have internal predecessors, (75), 9 states have call successors, (9), 4 states have call predecessors, (9), 25 states have return successors, (72), 29 states have call predecessors, (72), 9 states have call successors, (72) [2022-11-22 02:37:40,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 156 transitions. [2022-11-22 02:37:40,372 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 156 transitions. Word has length 180 [2022-11-22 02:37:40,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:37:40,373 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 156 transitions. [2022-11-22 02:37:40,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 121 states have (on average 1.421487603305785) internal successors, (172), 80 states have internal predecessors, (172), 27 states have call successors, (27), 1 states have call predecessors, (27), 43 states have return successors, (45), 45 states have call predecessors, (45), 27 states have call successors, (45) [2022-11-22 02:37:40,373 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 156 transitions. [2022-11-22 02:37:40,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2022-11-22 02:37:40,375 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:37:40,375 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 26, 24, 24, 24, 24, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:37:40,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-22 02:37:40,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-22 02:37:40,583 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:37:40,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:37:40,584 INFO L85 PathProgramCache]: Analyzing trace with hash -24316134, now seen corresponding path program 36 times [2022-11-22 02:37:40,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:37:40,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776015619] [2022-11-22 02:37:40,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:37:40,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:37:40,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:37:47,543 INFO L134 CoverageAnalysis]: Checked inductivity of 2177 backedges. 1 proven. 1844 refuted. 0 times theorem prover too weak. 332 trivial. 0 not checked. [2022-11-22 02:37:47,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:37:47,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776015619] [2022-11-22 02:37:47,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [776015619] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:37:47,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960644678] [2022-11-22 02:37:47,543 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:37:47,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:37:47,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:37:47,544 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:37:47,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-22 02:37:48,122 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:37:48,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:37:48,128 WARN L261 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 313 conjunts are in the unsatisfiable core [2022-11-22 02:37:48,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:37:54,489 INFO L134 CoverageAnalysis]: Checked inductivity of 2177 backedges. 18 proven. 984 refuted. 0 times theorem prover too weak. 1175 trivial. 0 not checked. [2022-11-22 02:37:54,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:38:23,655 INFO L134 CoverageAnalysis]: Checked inductivity of 2177 backedges. 89 proven. 1759 refuted. 0 times theorem prover too weak. 329 trivial. 0 not checked. [2022-11-22 02:38:23,655 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1960644678] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:38:23,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [435103454] [2022-11-22 02:38:23,656 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:38:23,657 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:38:23,657 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:38:23,658 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:38:23,658 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 46, 82] total 186 [2022-11-22 02:38:23,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811166542] [2022-11-22 02:38:23,658 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:38:23,659 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 186 states [2022-11-22 02:38:23,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:38:23,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2022-11-22 02:38:23,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=662, Invalid=33745, Unknown=3, NotChecked=0, Total=34410 [2022-11-22 02:38:23,662 INFO L87 Difference]: Start difference. First operand 106 states and 156 transitions. Second operand has 186 states, 180 states have (on average 1.5555555555555556) internal successors, (280), 115 states have internal predecessors, (280), 52 states have call successors, (52), 1 states have call predecessors, (52), 50 states have return successors, (72), 71 states have call predecessors, (72), 52 states have call successors, (72) [2022-11-22 02:38:37,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:38:37,005 INFO L93 Difference]: Finished difference Result 122 states and 193 transitions. [2022-11-22 02:38:37,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-22 02:38:37,005 INFO L78 Accepts]: Start accepts. Automaton has has 186 states, 180 states have (on average 1.5555555555555556) internal successors, (280), 115 states have internal predecessors, (280), 52 states have call successors, (52), 1 states have call predecessors, (52), 50 states have return successors, (72), 71 states have call predecessors, (72), 52 states have call successors, (72) Word has length 187 [2022-11-22 02:38:37,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:38:37,007 INFO L225 Difference]: With dead ends: 122 [2022-11-22 02:38:37,007 INFO L226 Difference]: Without dead ends: 116 [2022-11-22 02:38:37,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 253 SyntacticMatches, 21 SemanticMatches, 232 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12269 ImplicationChecksByTransitivity, 31.8s TimeCoverageRelationStatistics Valid=3530, Invalid=50989, Unknown=3, NotChecked=0, Total=54522 [2022-11-22 02:38:37,013 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 1823 mSDsluCounter, 2457 mSDsCounter, 0 mSdLazyCounter, 10241 mSolverCounterSat, 1063 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1825 SdHoareTripleChecker+Valid, 2488 SdHoareTripleChecker+Invalid, 11304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1063 IncrementalHoareTripleChecker+Valid, 10241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:38:37,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1825 Valid, 2488 Invalid, 11304 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1063 Valid, 10241 Invalid, 0 Unknown, 0 Unchecked, 8.2s Time] [2022-11-22 02:38:37,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-11-22 02:38:37,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 104. [2022-11-22 02:38:37,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 71 states have internal predecessors, (74), 8 states have call successors, (8), 4 states have call predecessors, (8), 25 states have return successors, (66), 28 states have call predecessors, (66), 8 states have call successors, (66) [2022-11-22 02:38:37,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 148 transitions. [2022-11-22 02:38:37,039 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 148 transitions. Word has length 187 [2022-11-22 02:38:37,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:38:37,040 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 148 transitions. [2022-11-22 02:38:37,040 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 186 states, 180 states have (on average 1.5555555555555556) internal successors, (280), 115 states have internal predecessors, (280), 52 states have call successors, (52), 1 states have call predecessors, (52), 50 states have return successors, (72), 71 states have call predecessors, (72), 52 states have call successors, (72) [2022-11-22 02:38:37,040 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 148 transitions. [2022-11-22 02:38:37,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2022-11-22 02:38:37,042 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:38:37,042 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 26, 24, 24, 24, 24, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:38:37,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-22 02:38:37,250 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-22 02:38:37,250 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:38:37,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:38:37,250 INFO L85 PathProgramCache]: Analyzing trace with hash -1188149092, now seen corresponding path program 37 times [2022-11-22 02:38:37,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:38:37,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131137687] [2022-11-22 02:38:37,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:38:37,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:38:37,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:38:44,224 INFO L134 CoverageAnalysis]: Checked inductivity of 2177 backedges. 0 proven. 1848 refuted. 0 times theorem prover too weak. 329 trivial. 0 not checked. [2022-11-22 02:38:44,224 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:38:44,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1131137687] [2022-11-22 02:38:44,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1131137687] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:38:44,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18278700] [2022-11-22 02:38:44,225 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:38:44,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:38:44,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:38:44,226 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:38:44,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-22 02:38:44,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:38:44,850 WARN L261 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 313 conjunts are in the unsatisfiable core [2022-11-22 02:38:44,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:38:51,643 INFO L134 CoverageAnalysis]: Checked inductivity of 2177 backedges. 19 proven. 986 refuted. 0 times theorem prover too weak. 1172 trivial. 0 not checked. [2022-11-22 02:38:51,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:39:15,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18278700] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:39:15,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [708488074] [2022-11-22 02:39:15,400 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-22 02:39:15,401 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:39:15,401 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) 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) [2022-11-22 02:39:15,401 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:39:15,401 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 48] total 130 [2022-11-22 02:39:15,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548128050] [2022-11-22 02:39:15,402 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:39:15,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2022-11-22 02:39:15,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:39:15,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2022-11-22 02:39:15,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=629, Invalid=31951, Unknown=0, NotChecked=0, Total=32580 [2022-11-22 02:39:15,404 INFO L87 Difference]: Start difference. First operand 104 states and 148 transitions. Second operand has 130 states, 126 states have (on average 1.4206349206349207) internal successors, (179), 83 states have internal predecessors, (179), 28 states have call successors, (28), 1 states have call predecessors, (28), 45 states have return successors, (47), 47 states have call predecessors, (47), 28 states have call successors, (47) [2022-11-22 02:39:23,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:39:23,938 INFO L93 Difference]: Finished difference Result 117 states and 168 transitions. [2022-11-22 02:39:23,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-22 02:39:23,938 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 126 states have (on average 1.4206349206349207) internal successors, (179), 83 states have internal predecessors, (179), 28 states have call successors, (28), 1 states have call predecessors, (28), 45 states have return successors, (47), 47 states have call predecessors, (47), 28 states have call successors, (47) Word has length 187 [2022-11-22 02:39:23,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:39:23,940 INFO L225 Difference]: With dead ends: 117 [2022-11-22 02:39:23,940 INFO L226 Difference]: Without dead ends: 113 [2022-11-22 02:39:23,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 228 SyntacticMatches, 21 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10787 ImplicationChecksByTransitivity, 27.1s TimeCoverageRelationStatistics Valid=3245, Invalid=46707, Unknown=0, NotChecked=0, Total=49952 [2022-11-22 02:39:23,944 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 1226 mSDsluCounter, 1994 mSDsCounter, 0 mSdLazyCounter, 5977 mSolverCounterSat, 609 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1228 SdHoareTripleChecker+Valid, 2025 SdHoareTripleChecker+Invalid, 6586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 609 IncrementalHoareTripleChecker+Valid, 5977 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:39:23,944 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1228 Valid, 2025 Invalid, 6586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [609 Valid, 5977 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-11-22 02:39:23,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-22 02:39:23,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 109. [2022-11-22 02:39:23,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 73 states have (on average 1.0547945205479452) internal successors, (77), 74 states have internal predecessors, (77), 9 states have call successors, (9), 4 states have call predecessors, (9), 26 states have return successors, (75), 30 states have call predecessors, (75), 9 states have call successors, (75) [2022-11-22 02:39:23,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 161 transitions. [2022-11-22 02:39:23,965 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 161 transitions. Word has length 187 [2022-11-22 02:39:23,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:39:23,965 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 161 transitions. [2022-11-22 02:39:23,966 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 126 states have (on average 1.4206349206349207) internal successors, (179), 83 states have internal predecessors, (179), 28 states have call successors, (28), 1 states have call predecessors, (28), 45 states have return successors, (47), 47 states have call predecessors, (47), 28 states have call successors, (47) [2022-11-22 02:39:23,966 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 161 transitions. [2022-11-22 02:39:23,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2022-11-22 02:39:23,967 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:39:23,968 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 28, 26, 26, 26, 26, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:39:23,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-22 02:39:24,175 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-22 02:39:24,176 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:39:24,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:39:24,176 INFO L85 PathProgramCache]: Analyzing trace with hash 1020155148, now seen corresponding path program 38 times [2022-11-22 02:39:24,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:39:24,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190255288] [2022-11-22 02:39:24,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:39:24,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:39:24,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:39:32,257 INFO L134 CoverageAnalysis]: Checked inductivity of 2540 backedges. 0 proven. 2158 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2022-11-22 02:39:32,257 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:39:32,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190255288] [2022-11-22 02:39:32,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190255288] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:39:32,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201675748] [2022-11-22 02:39:32,258 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:39:32,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:39:32,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:39:32,259 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:39:32,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_355016b9-b961-4edb-a3b4-cbaba497ce93/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-22 02:39:32,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2022-11-22 02:39:32,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:39:33,002 WARN L261 TraceCheckSpWp]: Trace formula consists of 577 conjuncts, 337 conjunts are in the unsatisfiable core [2022-11-22 02:39:33,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:39:39,477 INFO L134 CoverageAnalysis]: Checked inductivity of 2540 backedges. 39 proven. 1124 refuted. 0 times theorem prover too weak. 1377 trivial. 0 not checked. [2022-11-22 02:39:39,478 INFO L328 TraceCheckSpWp]: Computing backward predicates...