./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/sum_25x0-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e943c265 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_25x0-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE --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 0189dbb29c824fc5d22409df9775c70fa543bd61c2bf554681db703f0a461966 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-e943c26 [2021-10-24 10:29:31,692 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-24 10:29:31,695 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-24 10:29:31,757 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-24 10:29:31,758 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-24 10:29:31,763 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-24 10:29:31,765 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-24 10:29:31,770 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-24 10:29:31,773 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-24 10:29:31,779 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-24 10:29:31,780 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-24 10:29:31,782 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-24 10:29:31,783 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-24 10:29:31,786 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-24 10:29:31,789 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-24 10:29:31,795 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-24 10:29:31,797 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-24 10:29:31,799 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-24 10:29:31,802 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-24 10:29:31,811 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-24 10:29:31,813 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-24 10:29:31,815 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-24 10:29:31,819 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-24 10:29:31,820 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-24 10:29:31,830 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-24 10:29:31,831 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-24 10:29:31,831 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-24 10:29:31,833 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-24 10:29:31,834 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-24 10:29:31,836 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-24 10:29:31,836 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-24 10:29:31,837 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-24 10:29:31,840 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-24 10:29:31,841 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-24 10:29:31,843 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-24 10:29:31,843 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-24 10:29:31,844 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-24 10:29:31,844 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-24 10:29:31,845 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-24 10:29:31,846 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-24 10:29:31,846 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-24 10:29:31,847 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-24 10:29:31,894 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-24 10:29:31,894 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-24 10:29:31,895 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-24 10:29:31,896 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-24 10:29:31,896 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-24 10:29:31,896 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-24 10:29:31,897 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-24 10:29:31,897 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-24 10:29:31,897 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-24 10:29:31,897 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-24 10:29:31,898 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-24 10:29:31,899 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-24 10:29:31,899 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-24 10:29:31,899 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-24 10:29:31,900 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-24 10:29:31,900 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-24 10:29:31,901 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-24 10:29:31,901 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-24 10:29:31,901 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-24 10:29:31,902 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-24 10:29:31,902 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-24 10:29:31,902 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-24 10:29:31,902 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-24 10:29:31,903 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-24 10:29:31,903 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-24 10:29:31,903 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-24 10:29:31,903 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-24 10:29:31,904 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-24 10:29:31,904 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-24 10:29:31,904 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-24 10:29:31,904 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-24 10:29:31,905 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-24 10:29:31,905 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-24 10:29:31,906 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-24 10:29:31,906 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-24 10:29:31,906 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-24 10:29:31,906 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-24 10:29:31,907 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-24 10:29:31,907 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-24 10:29:31,907 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0189dbb29c824fc5d22409df9775c70fa543bd61c2bf554681db703f0a461966 [2021-10-24 10:29:32,191 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-24 10:29:32,213 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-24 10:29:32,216 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-24 10:29:32,217 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-24 10:29:32,218 INFO L275 PluginConnector]: CDTParser initialized [2021-10-24 10:29:32,219 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/../../sv-benchmarks/c/recursive-simple/sum_25x0-2.c [2021-10-24 10:29:32,310 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/data/5a61df4ac/904b6e84af1448c089677cf5a681eea7/FLAG542ae2878 [2021-10-24 10:29:32,860 INFO L306 CDTParser]: Found 1 translation units. [2021-10-24 10:29:32,860 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/sv-benchmarks/c/recursive-simple/sum_25x0-2.c [2021-10-24 10:29:32,866 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/data/5a61df4ac/904b6e84af1448c089677cf5a681eea7/FLAG542ae2878 [2021-10-24 10:29:33,233 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/data/5a61df4ac/904b6e84af1448c089677cf5a681eea7 [2021-10-24 10:29:33,239 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-24 10:29:33,240 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-24 10:29:33,242 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-24 10:29:33,242 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-24 10:29:33,245 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-24 10:29:33,246 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,247 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a3aceb9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33, skipping insertion in model container [2021-10-24 10:29:33,247 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,254 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-24 10:29:33,267 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-24 10:29:33,408 WARN L228 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_d63eaf76-4bb3-472a-aed3-7817e8063445/sv-benchmarks/c/recursive-simple/sum_25x0-2.c[481,494] [2021-10-24 10:29:33,435 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-24 10:29:33,452 INFO L203 MainTranslator]: Completed pre-run [2021-10-24 10:29:33,469 WARN L228 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_d63eaf76-4bb3-472a-aed3-7817e8063445/sv-benchmarks/c/recursive-simple/sum_25x0-2.c[481,494] [2021-10-24 10:29:33,470 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-24 10:29:33,487 INFO L208 MainTranslator]: Completed translation [2021-10-24 10:29:33,487 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33 WrapperNode [2021-10-24 10:29:33,487 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-24 10:29:33,488 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-24 10:29:33,489 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-24 10:29:33,489 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-24 10:29:33,497 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,503 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,516 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-24 10:29:33,517 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-24 10:29:33,517 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-24 10:29:33,518 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-24 10:29:33,526 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,527 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,528 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,528 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,531 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,533 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,534 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,536 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-24 10:29:33,537 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-24 10:29:33,537 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-24 10:29:33,537 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-24 10:29:33,538 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33" (1/1) ... [2021-10-24 10:29:33,546 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-24 10:29:33,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:29:33,570 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-24 10:29:33,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-24 10:29:33,614 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-24 10:29:33,615 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-24 10:29:33,617 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2021-10-24 10:29:33,617 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2021-10-24 10:29:33,617 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-24 10:29:33,617 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-24 10:29:33,823 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-24 10:29:33,823 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-24 10:29:33,825 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 10:29:33 BoogieIcfgContainer [2021-10-24 10:29:33,826 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-24 10:29:33,827 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-24 10:29:33,828 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-24 10:29:33,832 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-24 10:29:33,833 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 10:29:33" (1/3) ... [2021-10-24 10:29:33,834 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c8a0c14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 10:29:33, skipping insertion in model container [2021-10-24 10:29:33,834 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 10:29:33" (2/3) ... [2021-10-24 10:29:33,834 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c8a0c14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 10:29:33, skipping insertion in model container [2021-10-24 10:29:33,834 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 10:29:33" (3/3) ... [2021-10-24 10:29:33,836 INFO L111 eAbstractionObserver]: Analyzing ICFG sum_25x0-2.c [2021-10-24 10:29:33,841 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-24 10:29:33,842 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-24 10:29:33,946 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-24 10:29:33,953 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-10-24 10:29:33,953 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-24 10:29:33,990 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 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) [2021-10-24 10:29:33,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-24 10:29:34,008 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:29:34,009 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:29:34,009 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:29:34,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:29:34,015 INFO L82 PathProgramCache]: Analyzing trace with hash 1493244868, now seen corresponding path program 1 times [2021-10-24 10:29:34,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:29:34,041 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239180363] [2021-10-24 10:29:34,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:34,042 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:29:34,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:34,287 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-24 10:29:34,288 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:29:34,288 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239180363] [2021-10-24 10:29:34,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239180363] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-24 10:29:34,289 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-24 10:29:34,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-24 10:29:34,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817656210] [2021-10-24 10:29:34,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-24 10:29:34,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:29:34,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-24 10:29:34,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-24 10:29:34,313 INFO L87 Difference]: Start difference. First operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 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) Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-24 10:29:34,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:29:34,407 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2021-10-24 10:29:34,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-24 10:29:34,409 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-10-24 10:29:34,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:29:34,418 INFO L225 Difference]: With dead ends: 22 [2021-10-24 10:29:34,418 INFO L226 Difference]: Without dead ends: 14 [2021-10-24 10:29:34,421 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-24 10:29:34,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-10-24 10:29:34,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-10-24 10:29:34,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 10 states have internal predecessors, (10), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-24 10:29:34,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-10-24 10:29:34,465 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2021-10-24 10:29:34,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:29:34,465 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-10-24 10:29:34,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-24 10:29:34,466 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-10-24 10:29:34,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-24 10:29:34,468 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:29:34,468 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:29:34,468 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-24 10:29:34,469 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:29:34,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:29:34,475 INFO L82 PathProgramCache]: Analyzing trace with hash -642736818, now seen corresponding path program 1 times [2021-10-24 10:29:34,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:29:34,476 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139059717] [2021-10-24 10:29:34,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:34,477 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:29:34,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:34,624 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-24 10:29:34,624 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:29:34,624 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139059717] [2021-10-24 10:29:34,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139059717] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:29:34,625 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455763227] [2021-10-24 10:29:34,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:34,626 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:34,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:29:34,633 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:29:34,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-24 10:29:34,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:34,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-24 10:29:34,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:29:34,888 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-24 10:29:34,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:29:35,186 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-24 10:29:35,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [455763227] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:29:35,188 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [482032485] [2021-10-24 10:29:35,222 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:29:35,222 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:29:35,239 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:29:35,241 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:29:35,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2021-10-24 10:29:35,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373426427] [2021-10-24 10:29:35,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-24 10:29:35,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:29:35,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-24 10:29:35,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-10-24 10:29:35,256 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-24 10:29:35,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:29:35,317 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-10-24 10:29:35,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-24 10:29:35,318 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) Word has length 15 [2021-10-24 10:29:35,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:29:35,320 INFO L225 Difference]: With dead ends: 21 [2021-10-24 10:29:35,322 INFO L226 Difference]: Without dead ends: 17 [2021-10-24 10:29:35,325 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 66.9ms TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-10-24 10:29:35,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-10-24 10:29:35,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-10-24 10:29:35,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 12 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-10-24 10:29:35,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-10-24 10:29:35,334 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2021-10-24 10:29:35,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:29:35,336 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-10-24 10:29:35,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-24 10:29:35,342 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-10-24 10:29:35,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-10-24 10:29:35,345 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:29:35,346 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:29:35,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-24 10:29:35,559 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:35,560 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:29:35,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:29:35,560 INFO L82 PathProgramCache]: Analyzing trace with hash -2123675004, now seen corresponding path program 2 times [2021-10-24 10:29:35,561 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:29:35,561 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532400020] [2021-10-24 10:29:35,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:35,561 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:29:35,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:35,670 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-24 10:29:35,671 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:29:35,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532400020] [2021-10-24 10:29:35,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [532400020] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:29:35,672 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771681308] [2021-10-24 10:29:35,672 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-24 10:29:35,672 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:35,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:29:35,674 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:29:35,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-24 10:29:35,745 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-24 10:29:35,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:29:35,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-24 10:29:35,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:29:35,846 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-24 10:29:35,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:29:36,254 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-24 10:29:36,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771681308] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:29:36,255 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [170989836] [2021-10-24 10:29:36,258 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:29:36,258 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:29:36,258 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:29:36,259 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:29:36,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2021-10-24 10:29:36,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198340628] [2021-10-24 10:29:36,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-10-24 10:29:36,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:29:36,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-24 10:29:36,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-10-24 10:29:36,261 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 10 states have internal predecessors, (19), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2021-10-24 10:29:36,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:29:36,338 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-10-24 10:29:36,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-24 10:29:36,339 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 10 states have internal predecessors, (19), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) Word has length 21 [2021-10-24 10:29:36,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:29:36,340 INFO L225 Difference]: With dead ends: 24 [2021-10-24 10:29:36,340 INFO L226 Difference]: Without dead ends: 20 [2021-10-24 10:29:36,341 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 92.3ms TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2021-10-24 10:29:36,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-10-24 10:29:36,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-10-24 10:29:36,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 14 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-10-24 10:29:36,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-10-24 10:29:36,346 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 21 [2021-10-24 10:29:36,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:29:36,346 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-10-24 10:29:36,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 10 states have internal predecessors, (19), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2021-10-24 10:29:36,347 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-10-24 10:29:36,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-10-24 10:29:36,348 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:29:36,348 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:29:36,376 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-24 10:29:36,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:36,561 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:29:36,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:29:36,562 INFO L82 PathProgramCache]: Analyzing trace with hash 54189198, now seen corresponding path program 3 times [2021-10-24 10:29:36,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:29:36,562 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217160768] [2021-10-24 10:29:36,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:36,562 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:29:36,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:36,684 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-24 10:29:36,685 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:29:36,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217160768] [2021-10-24 10:29:36,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217160768] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:29:36,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741883393] [2021-10-24 10:29:36,686 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-24 10:29:36,686 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:36,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:29:36,689 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:29:36,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-24 10:29:36,775 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-24 10:29:36,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:29:36,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-24 10:29:36,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:29:36,889 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-24 10:29:36,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:29:37,420 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-24 10:29:37,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741883393] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:29:37,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [177276977] [2021-10-24 10:29:37,425 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:29:37,426 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:29:37,427 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:29:37,428 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:29:37,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2021-10-24 10:29:37,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264591045] [2021-10-24 10:29:37,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-10-24 10:29:37,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:29:37,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-10-24 10:29:37,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-10-24 10:29:37,432 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2021-10-24 10:29:37,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:29:37,512 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2021-10-24 10:29:37,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-24 10:29:37,512 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) Word has length 27 [2021-10-24 10:29:37,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:29:37,513 INFO L225 Difference]: With dead ends: 27 [2021-10-24 10:29:37,514 INFO L226 Difference]: Without dead ends: 23 [2021-10-24 10:29:37,514 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 102.8ms TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2021-10-24 10:29:37,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-10-24 10:29:37,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-10-24 10:29:37,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 16 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 5 states have return successors, (6), 5 states have call predecessors, (6), 2 states have call successors, (6) [2021-10-24 10:29:37,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-10-24 10:29:37,520 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 27 [2021-10-24 10:29:37,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:29:37,521 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-10-24 10:29:37,521 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2021-10-24 10:29:37,521 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-10-24 10:29:37,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-10-24 10:29:37,523 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:29:37,523 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:29:37,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-24 10:29:37,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:37,749 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:29:37,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:29:37,750 INFO L82 PathProgramCache]: Analyzing trace with hash -1269749436, now seen corresponding path program 4 times [2021-10-24 10:29:37,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:29:37,750 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698390964] [2021-10-24 10:29:37,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:37,750 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:29:37,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:37,873 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-10-24 10:29:37,874 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:29:37,874 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698390964] [2021-10-24 10:29:37,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1698390964] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:29:37,875 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980426053] [2021-10-24 10:29:37,875 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-24 10:29:37,875 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:37,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:29:37,876 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:29:37,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-24 10:29:37,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:37,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-24 10:29:37,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:29:38,113 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-10-24 10:29:38,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:29:38,895 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-24 10:29:38,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980426053] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:29:38,897 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1106761216] [2021-10-24 10:29:38,902 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:29:38,902 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:29:38,902 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:29:38,903 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:29:38,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2021-10-24 10:29:38,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075519303] [2021-10-24 10:29:38,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-24 10:29:38,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:29:38,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-24 10:29:38,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2021-10-24 10:29:38,907 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 15 states, 13 states have (on average 2.076923076923077) internal successors, (27), 14 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-24 10:29:39,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:29:39,000 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2021-10-24 10:29:39,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-24 10:29:39,001 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.076923076923077) internal successors, (27), 14 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) Word has length 33 [2021-10-24 10:29:39,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:29:39,003 INFO L225 Difference]: With dead ends: 30 [2021-10-24 10:29:39,003 INFO L226 Difference]: Without dead ends: 26 [2021-10-24 10:29:39,004 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 138.9ms TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2021-10-24 10:29:39,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-10-24 10:29:39,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-10-24 10:29:39,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 18 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 6 states have return successors, (7), 6 states have call predecessors, (7), 2 states have call successors, (7) [2021-10-24 10:29:39,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-10-24 10:29:39,020 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 33 [2021-10-24 10:29:39,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:29:39,020 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-10-24 10:29:39,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.076923076923077) internal successors, (27), 14 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2021-10-24 10:29:39,020 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-10-24 10:29:39,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-10-24 10:29:39,023 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:29:39,024 INFO L512 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:29:39,060 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-24 10:29:39,237 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:39,237 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:29:39,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:29:39,237 INFO L82 PathProgramCache]: Analyzing trace with hash -4035634, now seen corresponding path program 5 times [2021-10-24 10:29:39,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:29:39,238 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401084043] [2021-10-24 10:29:39,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:39,238 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:29:39,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:39,346 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-10-24 10:29:39,346 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:29:39,346 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401084043] [2021-10-24 10:29:39,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401084043] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:29:39,346 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725221774] [2021-10-24 10:29:39,346 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-24 10:29:39,347 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:39,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:29:39,348 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:29:39,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-24 10:29:39,475 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-10-24 10:29:39,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:29:39,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-24 10:29:39,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:29:39,647 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-10-24 10:29:39,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:29:40,729 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-24 10:29:40,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725221774] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:29:40,729 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1805605534] [2021-10-24 10:29:40,733 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:29:40,734 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:29:40,734 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:29:40,734 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:29:40,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2021-10-24 10:29:40,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385126380] [2021-10-24 10:29:40,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-24 10:29:40,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:29:40,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-24 10:29:40,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2021-10-24 10:29:40,737 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 17 states, 15 states have (on average 2.066666666666667) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) [2021-10-24 10:29:40,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:29:40,845 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2021-10-24 10:29:40,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-24 10:29:40,846 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.066666666666667) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) Word has length 39 [2021-10-24 10:29:40,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:29:40,847 INFO L225 Difference]: With dead ends: 33 [2021-10-24 10:29:40,848 INFO L226 Difference]: Without dead ends: 29 [2021-10-24 10:29:40,848 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 161.5ms TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2021-10-24 10:29:40,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-10-24 10:29:40,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-10-24 10:29:40,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 20 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 7 states have return successors, (8), 7 states have call predecessors, (8), 2 states have call successors, (8) [2021-10-24 10:29:40,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-10-24 10:29:40,854 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 39 [2021-10-24 10:29:40,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:29:40,854 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-10-24 10:29:40,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.066666666666667) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) [2021-10-24 10:29:40,855 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-10-24 10:29:40,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-10-24 10:29:40,856 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:29:40,856 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:29:40,890 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-24 10:29:41,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:41,073 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:29:41,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:29:41,073 INFO L82 PathProgramCache]: Analyzing trace with hash -1047611388, now seen corresponding path program 6 times [2021-10-24 10:29:41,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:29:41,074 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096375239] [2021-10-24 10:29:41,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:41,074 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:29:41,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:41,250 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-10-24 10:29:41,250 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:29:41,250 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096375239] [2021-10-24 10:29:41,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096375239] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:29:41,250 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1961023623] [2021-10-24 10:29:41,250 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-24 10:29:41,251 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:41,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:29:41,253 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:29:41,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-24 10:29:41,430 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-24 10:29:41,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:29:41,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-24 10:29:41,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:29:41,573 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-10-24 10:29:41,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:29:43,060 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-24 10:29:43,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1961023623] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:29:43,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1866700738] [2021-10-24 10:29:43,062 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:29:43,063 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:29:43,063 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:29:43,064 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:29:43,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2021-10-24 10:29:43,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823946850] [2021-10-24 10:29:43,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-10-24 10:29:43,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:29:43,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-10-24 10:29:43,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2021-10-24 10:29:43,067 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 19 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 18 states have internal predecessors, (35), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (14), 7 states have call predecessors, (14), 9 states have call successors, (14) [2021-10-24 10:29:43,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:29:43,201 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2021-10-24 10:29:43,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-24 10:29:43,202 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 18 states have internal predecessors, (35), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (14), 7 states have call predecessors, (14), 9 states have call successors, (14) Word has length 45 [2021-10-24 10:29:43,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:29:43,206 INFO L225 Difference]: With dead ends: 36 [2021-10-24 10:29:43,206 INFO L226 Difference]: Without dead ends: 32 [2021-10-24 10:29:43,207 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 188.0ms TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2021-10-24 10:29:43,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-10-24 10:29:43,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-10-24 10:29:43,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 22 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (9), 8 states have call predecessors, (9), 2 states have call successors, (9) [2021-10-24 10:29:43,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-10-24 10:29:43,221 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 45 [2021-10-24 10:29:43,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:29:43,222 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-10-24 10:29:43,222 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 18 states have internal predecessors, (35), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (14), 7 states have call predecessors, (14), 9 states have call successors, (14) [2021-10-24 10:29:43,222 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-10-24 10:29:43,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-10-24 10:29:43,232 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:29:43,233 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:29:43,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-10-24 10:29:43,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:43,444 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:29:43,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:29:43,444 INFO L82 PathProgramCache]: Analyzing trace with hash 1466649358, now seen corresponding path program 7 times [2021-10-24 10:29:43,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:29:43,444 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056522864] [2021-10-24 10:29:43,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:43,445 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:29:43,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:43,613 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-10-24 10:29:43,614 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:29:43,614 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056522864] [2021-10-24 10:29:43,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056522864] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:29:43,614 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433082249] [2021-10-24 10:29:43,614 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-24 10:29:43,614 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:43,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:29:43,616 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:29:43,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-24 10:29:43,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:43,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 18 conjunts are in the unsatisfiable core [2021-10-24 10:29:43,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:29:44,050 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-10-24 10:29:44,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:29:46,067 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-10-24 10:29:46,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [433082249] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:29:46,068 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [716300737] [2021-10-24 10:29:46,070 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:29:46,070 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:29:46,070 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:29:46,071 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:29:46,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2021-10-24 10:29:46,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413755100] [2021-10-24 10:29:46,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-10-24 10:29:46,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:29:46,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-10-24 10:29:46,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2021-10-24 10:29:46,073 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 20 states have internal predecessors, (39), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (16), 8 states have call predecessors, (16), 10 states have call successors, (16) [2021-10-24 10:29:46,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:29:46,226 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2021-10-24 10:29:46,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-24 10:29:46,229 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 20 states have internal predecessors, (39), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (16), 8 states have call predecessors, (16), 10 states have call successors, (16) Word has length 51 [2021-10-24 10:29:46,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:29:46,233 INFO L225 Difference]: With dead ends: 39 [2021-10-24 10:29:46,233 INFO L226 Difference]: Without dead ends: 35 [2021-10-24 10:29:46,234 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 266.1ms TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2021-10-24 10:29:46,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-10-24 10:29:46,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-10-24 10:29:46,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 24 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 9 states have return successors, (10), 9 states have call predecessors, (10), 2 states have call successors, (10) [2021-10-24 10:29:46,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-10-24 10:29:46,246 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 51 [2021-10-24 10:29:46,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:29:46,246 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-10-24 10:29:46,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 20 states have internal predecessors, (39), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (16), 8 states have call predecessors, (16), 10 states have call successors, (16) [2021-10-24 10:29:46,247 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-10-24 10:29:46,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-10-24 10:29:46,251 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:29:46,252 INFO L512 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:29:46,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-24 10:29:46,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-10-24 10:29:46,465 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:29:46,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:29:46,465 INFO L82 PathProgramCache]: Analyzing trace with hash 335541956, now seen corresponding path program 8 times [2021-10-24 10:29:46,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:29:46,466 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30512255] [2021-10-24 10:29:46,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:46,466 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:29:46,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:46,665 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-10-24 10:29:46,665 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:29:46,665 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30512255] [2021-10-24 10:29:46,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30512255] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:29:46,665 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1856921039] [2021-10-24 10:29:46,665 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-24 10:29:46,666 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:46,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:29:46,666 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:29:46,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-24 10:29:46,972 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-10-24 10:29:46,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:29:46,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 40 conjunts are in the unsatisfiable core [2021-10-24 10:29:46,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:29:47,511 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-10-24 10:29:47,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:29:53,201 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-10-24 10:29:53,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1856921039] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:29:53,202 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1494676486] [2021-10-24 10:29:53,205 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:29:53,205 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:29:53,206 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:29:53,208 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:29:53,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 23, 23] total 36 [2021-10-24 10:29:53,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880663851] [2021-10-24 10:29:53,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-10-24 10:29:53,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:29:53,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-10-24 10:29:53,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1084, Unknown=0, NotChecked=0, Total=1260 [2021-10-24 10:29:53,218 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 36 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 25 states have internal predecessors, (49), 4 states have call successors, (4), 1 states have call predecessors, (4), 18 states have return successors, (19), 19 states have call predecessors, (19), 4 states have call successors, (19) [2021-10-24 10:29:53,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:29:53,773 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2021-10-24 10:29:53,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-10-24 10:29:53,774 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 25 states have internal predecessors, (49), 4 states have call successors, (4), 1 states have call predecessors, (4), 18 states have return successors, (19), 19 states have call predecessors, (19), 4 states have call successors, (19) Word has length 57 [2021-10-24 10:29:53,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:29:53,776 INFO L225 Difference]: With dead ends: 42 [2021-10-24 10:29:53,776 INFO L226 Difference]: Without dead ends: 38 [2021-10-24 10:29:53,778 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 831.6ms TimeCoverageRelationStatistics Valid=491, Invalid=2371, Unknown=0, NotChecked=0, Total=2862 [2021-10-24 10:29:53,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-10-24 10:29:53,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-10-24 10:29:53,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 25 states have (on average 1.04) internal successors, (26), 26 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 10 states have return successors, (11), 10 states have call predecessors, (11), 2 states have call successors, (11) [2021-10-24 10:29:53,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-10-24 10:29:53,785 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 57 [2021-10-24 10:29:53,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:29:53,785 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-10-24 10:29:53,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 25 states have internal predecessors, (49), 4 states have call successors, (4), 1 states have call predecessors, (4), 18 states have return successors, (19), 19 states have call predecessors, (19), 4 states have call successors, (19) [2021-10-24 10:29:53,786 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-10-24 10:29:53,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-10-24 10:29:53,787 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:29:53,787 INFO L512 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:29:53,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-24 10:29:53,988 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-10-24 10:29:53,988 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:29:53,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:29:53,989 INFO L82 PathProgramCache]: Analyzing trace with hash -682001842, now seen corresponding path program 9 times [2021-10-24 10:29:53,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:29:53,989 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026106955] [2021-10-24 10:29:53,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:53,989 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:29:54,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:54,187 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-10-24 10:29:54,187 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:29:54,188 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026106955] [2021-10-24 10:29:54,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1026106955] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:29:54,188 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578775115] [2021-10-24 10:29:54,188 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-24 10:29:54,188 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:54,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:29:54,190 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:29:54,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-24 10:29:54,747 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-24 10:29:54,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:29:54,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 22 conjunts are in the unsatisfiable core [2021-10-24 10:29:54,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:29:55,014 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-10-24 10:29:55,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:29:58,509 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-10-24 10:29:58,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578775115] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:29:58,509 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1145620906] [2021-10-24 10:29:58,511 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:29:58,512 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:29:58,512 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:29:58,513 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:29:58,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2021-10-24 10:29:58,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873739009] [2021-10-24 10:29:58,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-10-24 10:29:58,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:29:58,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-10-24 10:29:58,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2021-10-24 10:29:58,516 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 25 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 24 states have internal predecessors, (47), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (20), 10 states have call predecessors, (20), 12 states have call successors, (20) [2021-10-24 10:29:58,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:29:58,735 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2021-10-24 10:29:58,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-24 10:29:58,736 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 24 states have internal predecessors, (47), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (20), 10 states have call predecessors, (20), 12 states have call successors, (20) Word has length 63 [2021-10-24 10:29:58,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:29:58,737 INFO L225 Difference]: With dead ends: 45 [2021-10-24 10:29:58,737 INFO L226 Difference]: Without dead ends: 41 [2021-10-24 10:29:58,739 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 326.7ms TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2021-10-24 10:29:58,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-10-24 10:29:58,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-10-24 10:29:58,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 27 states have (on average 1.037037037037037) internal successors, (28), 28 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 11 states have return successors, (12), 11 states have call predecessors, (12), 2 states have call successors, (12) [2021-10-24 10:29:58,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2021-10-24 10:29:58,745 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 63 [2021-10-24 10:29:58,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:29:58,746 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2021-10-24 10:29:58,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 24 states have internal predecessors, (47), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (20), 10 states have call predecessors, (20), 12 states have call successors, (20) [2021-10-24 10:29:58,747 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2021-10-24 10:29:58,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-10-24 10:29:58,748 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:29:58,748 INFO L512 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:29:58,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-24 10:29:58,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-10-24 10:29:58,964 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:29:58,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:29:58,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1904272772, now seen corresponding path program 10 times [2021-10-24 10:29:58,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:29:58,965 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466823263] [2021-10-24 10:29:58,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:29:58,965 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:29:59,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:59,224 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-10-24 10:29:59,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:29:59,225 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466823263] [2021-10-24 10:29:59,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466823263] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:29:59,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070289302] [2021-10-24 10:29:59,226 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-24 10:29:59,226 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:29:59,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:29:59,227 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:29:59,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-24 10:29:59,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:29:59,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 24 conjunts are in the unsatisfiable core [2021-10-24 10:29:59,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:30:00,159 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-10-24 10:30:00,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:30:04,472 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-10-24 10:30:04,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1070289302] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:30:04,472 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1267062068] [2021-10-24 10:30:04,474 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:30:04,474 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:30:04,475 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:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:30:04,475 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:30:04,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 27 [2021-10-24 10:30:04,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193435943] [2021-10-24 10:30:04,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-24 10:30:04,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:30:04,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-24 10:30:04,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2021-10-24 10:30:04,479 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 27 states, 25 states have (on average 2.04) internal successors, (51), 26 states have internal predecessors, (51), 13 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (22), 11 states have call predecessors, (22), 13 states have call successors, (22) [2021-10-24 10:30:04,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:30:04,728 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2021-10-24 10:30:04,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-10-24 10:30:04,730 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 2.04) internal successors, (51), 26 states have internal predecessors, (51), 13 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (22), 11 states have call predecessors, (22), 13 states have call successors, (22) Word has length 69 [2021-10-24 10:30:04,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:30:04,731 INFO L225 Difference]: With dead ends: 48 [2021-10-24 10:30:04,732 INFO L226 Difference]: Without dead ends: 44 [2021-10-24 10:30:04,733 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 421.9ms TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2021-10-24 10:30:04,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-10-24 10:30:04,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-10-24 10:30:04,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 30 states have internal predecessors, (30), 2 states have call successors, (2), 1 states have call predecessors, (2), 12 states have return successors, (13), 12 states have call predecessors, (13), 2 states have call successors, (13) [2021-10-24 10:30:04,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2021-10-24 10:30:04,739 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 69 [2021-10-24 10:30:04,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:30:04,739 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2021-10-24 10:30:04,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 2.04) internal successors, (51), 26 states have internal predecessors, (51), 13 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (22), 11 states have call predecessors, (22), 13 states have call successors, (22) [2021-10-24 10:30:04,740 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2021-10-24 10:30:04,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-10-24 10:30:04,741 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:30:04,741 INFO L512 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:30:04,788 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-24 10:30:04,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-10-24 10:30:04,956 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:30:04,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:30:04,956 INFO L82 PathProgramCache]: Analyzing trace with hash -776930930, now seen corresponding path program 11 times [2021-10-24 10:30:04,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:30:04,956 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894563208] [2021-10-24 10:30:04,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:30:04,957 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:30:04,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:30:05,181 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-10-24 10:30:05,181 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:30:05,182 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894563208] [2021-10-24 10:30:05,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894563208] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:30:05,182 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [462940676] [2021-10-24 10:30:05,182 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-24 10:30:05,182 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:30:05,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:30:05,183 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:30:05,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-10-24 10:30:05,809 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-10-24 10:30:05,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:30:05,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 26 conjunts are in the unsatisfiable core [2021-10-24 10:30:05,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:30:06,033 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-10-24 10:30:06,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:30:11,455 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-10-24 10:30:11,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [462940676] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:30:11,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1481630888] [2021-10-24 10:30:11,458 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:30:11,458 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:30:11,458 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:30:11,462 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:30:11,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 29 [2021-10-24 10:30:11,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155786602] [2021-10-24 10:30:11,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-10-24 10:30:11,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:30:11,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-10-24 10:30:11,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2021-10-24 10:30:11,465 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 29 states, 27 states have (on average 2.037037037037037) internal successors, (55), 28 states have internal predecessors, (55), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (24), 12 states have call predecessors, (24), 14 states have call successors, (24) [2021-10-24 10:30:11,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:30:11,722 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2021-10-24 10:30:11,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-24 10:30:11,722 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 2.037037037037037) internal successors, (55), 28 states have internal predecessors, (55), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (24), 12 states have call predecessors, (24), 14 states have call successors, (24) Word has length 75 [2021-10-24 10:30:11,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:30:11,725 INFO L225 Difference]: With dead ends: 51 [2021-10-24 10:30:11,725 INFO L226 Difference]: Without dead ends: 47 [2021-10-24 10:30:11,726 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 439.0ms TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2021-10-24 10:30:11,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-10-24 10:30:11,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-10-24 10:30:11,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 31 states have (on average 1.032258064516129) internal successors, (32), 32 states have internal predecessors, (32), 2 states have call successors, (2), 1 states have call predecessors, (2), 13 states have return successors, (14), 13 states have call predecessors, (14), 2 states have call successors, (14) [2021-10-24 10:30:11,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-10-24 10:30:11,736 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 75 [2021-10-24 10:30:11,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:30:11,737 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-10-24 10:30:11,737 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 2.037037037037037) internal successors, (55), 28 states have internal predecessors, (55), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (24), 12 states have call predecessors, (24), 14 states have call successors, (24) [2021-10-24 10:30:11,738 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-10-24 10:30:11,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-10-24 10:30:11,740 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:30:11,741 INFO L512 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:30:11,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-10-24 10:30:11,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:30:11,941 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:30:11,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:30:11,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1158839228, now seen corresponding path program 12 times [2021-10-24 10:30:11,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:30:11,942 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090982857] [2021-10-24 10:30:11,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:30:11,942 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:30:11,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:30:12,162 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-10-24 10:30:12,162 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:30:12,162 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090982857] [2021-10-24 10:30:12,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090982857] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:30:12,162 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448953691] [2021-10-24 10:30:12,162 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-24 10:30:12,162 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:30:12,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:30:12,163 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:30:12,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-24 10:30:12,925 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-24 10:30:12,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:30:12,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 28 conjunts are in the unsatisfiable core [2021-10-24 10:30:12,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:30:13,205 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-10-24 10:30:13,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:30:20,000 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-10-24 10:30:20,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448953691] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:30:20,001 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1590609034] [2021-10-24 10:30:20,003 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:30:20,003 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:30:20,004 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:30:20,005 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:30:20,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 31 [2021-10-24 10:30:20,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751456067] [2021-10-24 10:30:20,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-10-24 10:30:20,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:30:20,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-10-24 10:30:20,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2021-10-24 10:30:20,008 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 30 states have internal predecessors, (59), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (26), 13 states have call predecessors, (26), 15 states have call successors, (26) [2021-10-24 10:30:20,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:30:20,280 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2021-10-24 10:30:20,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-10-24 10:30:20,280 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 30 states have internal predecessors, (59), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (26), 13 states have call predecessors, (26), 15 states have call successors, (26) Word has length 81 [2021-10-24 10:30:20,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:30:20,282 INFO L225 Difference]: With dead ends: 54 [2021-10-24 10:30:20,282 INFO L226 Difference]: Without dead ends: 50 [2021-10-24 10:30:20,283 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 488.7ms TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2021-10-24 10:30:20,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-10-24 10:30:20,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-10-24 10:30:20,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 34 states have internal predecessors, (34), 2 states have call successors, (2), 1 states have call predecessors, (2), 14 states have return successors, (15), 14 states have call predecessors, (15), 2 states have call successors, (15) [2021-10-24 10:30:20,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-10-24 10:30:20,293 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 81 [2021-10-24 10:30:20,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:30:20,294 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-10-24 10:30:20,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 30 states have internal predecessors, (59), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (26), 13 states have call predecessors, (26), 15 states have call successors, (26) [2021-10-24 10:30:20,295 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-10-24 10:30:20,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-10-24 10:30:20,297 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:30:20,297 INFO L512 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:30:20,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-10-24 10:30:20,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-10-24 10:30:20,513 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:30:20,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:30:20,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1570097358, now seen corresponding path program 13 times [2021-10-24 10:30:20,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:30:20,514 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210282820] [2021-10-24 10:30:20,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:30:20,514 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:30:20,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:30:20,798 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-10-24 10:30:20,799 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:30:20,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210282820] [2021-10-24 10:30:20,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210282820] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:30:20,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478422529] [2021-10-24 10:30:20,800 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-24 10:30:20,800 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:30:20,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:30:20,805 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:30:20,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-24 10:30:21,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:30:21,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 30 conjunts are in the unsatisfiable core [2021-10-24 10:30:21,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:30:22,001 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-10-24 10:30:22,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:30:30,484 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-10-24 10:30:30,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478422529] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:30:30,484 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [900469550] [2021-10-24 10:30:30,486 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:30:30,486 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:30:30,487 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:30:30,488 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:30:30,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 33 [2021-10-24 10:30:30,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997762773] [2021-10-24 10:30:30,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-10-24 10:30:30,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:30:30,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-10-24 10:30:30,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2021-10-24 10:30:30,491 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 33 states, 31 states have (on average 2.032258064516129) internal successors, (63), 32 states have internal predecessors, (63), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (28), 14 states have call predecessors, (28), 16 states have call successors, (28) [2021-10-24 10:30:30,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:30:30,736 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2021-10-24 10:30:30,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-10-24 10:30:30,736 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 2.032258064516129) internal successors, (63), 32 states have internal predecessors, (63), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (28), 14 states have call predecessors, (28), 16 states have call successors, (28) Word has length 87 [2021-10-24 10:30:30,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:30:30,737 INFO L225 Difference]: With dead ends: 57 [2021-10-24 10:30:30,737 INFO L226 Difference]: Without dead ends: 53 [2021-10-24 10:30:30,739 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 531.7ms TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2021-10-24 10:30:30,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-10-24 10:30:30,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-10-24 10:30:30,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 36 states have internal predecessors, (36), 2 states have call successors, (2), 1 states have call predecessors, (2), 15 states have return successors, (16), 15 states have call predecessors, (16), 2 states have call successors, (16) [2021-10-24 10:30:30,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2021-10-24 10:30:30,743 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 87 [2021-10-24 10:30:30,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:30:30,744 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2021-10-24 10:30:30,744 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 2.032258064516129) internal successors, (63), 32 states have internal predecessors, (63), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (28), 14 states have call predecessors, (28), 16 states have call successors, (28) [2021-10-24 10:30:30,745 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2021-10-24 10:30:30,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-10-24 10:30:30,745 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:30:30,746 INFO L512 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:30:30,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-10-24 10:30:30,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-10-24 10:30:30,949 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:30:30,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:30:30,949 INFO L82 PathProgramCache]: Analyzing trace with hash -1407069436, now seen corresponding path program 14 times [2021-10-24 10:30:30,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:30:30,950 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341310714] [2021-10-24 10:30:30,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:30:30,950 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:30:30,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:30:31,208 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-10-24 10:30:31,209 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:30:31,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341310714] [2021-10-24 10:30:31,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1341310714] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:30:31,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67819756] [2021-10-24 10:30:31,209 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-24 10:30:31,209 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:30:31,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:30:31,210 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:30:31,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-10-24 10:30:32,344 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-10-24 10:30:32,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:30:32,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 32 conjunts are in the unsatisfiable core [2021-10-24 10:30:32,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:30:32,597 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-10-24 10:30:32,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:30:42,827 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-10-24 10:30:42,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67819756] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:30:42,827 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [94714943] [2021-10-24 10:30:42,829 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:30:42,829 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:30:42,830 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:30:42,830 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:30:42,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 35 [2021-10-24 10:30:42,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140050421] [2021-10-24 10:30:42,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-10-24 10:30:42,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:30:42,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-10-24 10:30:42,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2021-10-24 10:30:42,833 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 35 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 34 states have internal predecessors, (67), 17 states have call successors, (17), 1 states have call predecessors, (17), 15 states have return successors, (30), 15 states have call predecessors, (30), 17 states have call successors, (30) [2021-10-24 10:30:43,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:30:43,141 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2021-10-24 10:30:43,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-10-24 10:30:43,141 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 34 states have internal predecessors, (67), 17 states have call successors, (17), 1 states have call predecessors, (17), 15 states have return successors, (30), 15 states have call predecessors, (30), 17 states have call successors, (30) Word has length 93 [2021-10-24 10:30:43,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:30:43,143 INFO L225 Difference]: With dead ends: 60 [2021-10-24 10:30:43,143 INFO L226 Difference]: Without dead ends: 56 [2021-10-24 10:30:43,144 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 597.2ms TimeCoverageRelationStatistics Valid=803, Invalid=1647, Unknown=0, NotChecked=0, Total=2450 [2021-10-24 10:30:43,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-10-24 10:30:43,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-10-24 10:30:43,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.027027027027027) internal successors, (38), 38 states have internal predecessors, (38), 2 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (17), 16 states have call predecessors, (17), 2 states have call successors, (17) [2021-10-24 10:30:43,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-10-24 10:30:43,153 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 93 [2021-10-24 10:30:43,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:30:43,154 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-10-24 10:30:43,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 34 states have internal predecessors, (67), 17 states have call successors, (17), 1 states have call predecessors, (17), 15 states have return successors, (30), 15 states have call predecessors, (30), 17 states have call successors, (30) [2021-10-24 10:30:43,154 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-10-24 10:30:43,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-10-24 10:30:43,156 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:30:43,156 INFO L512 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:30:43,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-10-24 10:30:43,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-10-24 10:30:43,373 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:30:43,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:30:43,373 INFO L82 PathProgramCache]: Analyzing trace with hash -1758730226, now seen corresponding path program 15 times [2021-10-24 10:30:43,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:30:43,374 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946584641] [2021-10-24 10:30:43,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:30:43,374 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:30:43,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:30:43,656 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-10-24 10:30:43,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:30:43,657 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946584641] [2021-10-24 10:30:43,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946584641] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:30:43,657 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737787873] [2021-10-24 10:30:43,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-24 10:30:43,657 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:30:43,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:30:43,658 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:30:43,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-24 10:30:45,010 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-24 10:30:45,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:30:45,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 34 conjunts are in the unsatisfiable core [2021-10-24 10:30:45,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:30:45,318 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-10-24 10:30:45,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:30:57,480 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-10-24 10:30:57,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737787873] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:30:57,480 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1282161214] [2021-10-24 10:30:57,481 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:30:57,482 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:30:57,482 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:30:57,482 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:30:57,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 35] total 37 [2021-10-24 10:30:57,483 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295373523] [2021-10-24 10:30:57,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-10-24 10:30:57,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:30:57,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-10-24 10:30:57,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=988, Unknown=0, NotChecked=0, Total=1332 [2021-10-24 10:30:57,485 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 37 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 36 states have internal predecessors, (71), 18 states have call successors, (18), 1 states have call predecessors, (18), 16 states have return successors, (32), 16 states have call predecessors, (32), 18 states have call successors, (32) [2021-10-24 10:30:57,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:30:57,828 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2021-10-24 10:30:57,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-24 10:30:57,829 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 36 states have internal predecessors, (71), 18 states have call successors, (18), 1 states have call predecessors, (18), 16 states have return successors, (32), 16 states have call predecessors, (32), 18 states have call successors, (32) Word has length 99 [2021-10-24 10:30:57,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:30:57,830 INFO L225 Difference]: With dead ends: 63 [2021-10-24 10:30:57,830 INFO L226 Difference]: Without dead ends: 59 [2021-10-24 10:30:57,832 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 668.2ms TimeCoverageRelationStatistics Valid=904, Invalid=1852, Unknown=0, NotChecked=0, Total=2756 [2021-10-24 10:30:57,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-10-24 10:30:57,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-10-24 10:30:57,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 40 states have internal predecessors, (40), 2 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (18), 17 states have call predecessors, (18), 2 states have call successors, (18) [2021-10-24 10:30:57,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-10-24 10:30:57,839 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 99 [2021-10-24 10:30:57,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:30:57,839 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-10-24 10:30:57,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 36 states have internal predecessors, (71), 18 states have call successors, (18), 1 states have call predecessors, (18), 16 states have return successors, (32), 16 states have call predecessors, (32), 18 states have call successors, (32) [2021-10-24 10:30:57,840 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-10-24 10:30:57,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-10-24 10:30:57,841 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:30:57,841 INFO L512 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:30:57,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-24 10:30:58,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-10-24 10:30:58,061 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:30:58,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:30:58,061 INFO L82 PathProgramCache]: Analyzing trace with hash -1678126652, now seen corresponding path program 16 times [2021-10-24 10:30:58,061 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:30:58,062 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019173500] [2021-10-24 10:30:58,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:30:58,062 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:30:58,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:30:58,406 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-10-24 10:30:58,406 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:30:58,406 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019173500] [2021-10-24 10:30:58,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019173500] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:30:58,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809330092] [2021-10-24 10:30:58,407 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-24 10:30:58,407 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:30:58,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:30:58,409 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:30:58,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-10-24 10:31:00,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:31:00,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 36 conjunts are in the unsatisfiable core [2021-10-24 10:31:00,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:31:00,686 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-10-24 10:31:00,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:31:15,429 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-10-24 10:31:15,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1809330092] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:31:15,429 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1509484268] [2021-10-24 10:31:15,430 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:31:15,431 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:31:15,431 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:31:15,431 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:31:15,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 37] total 39 [2021-10-24 10:31:15,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365135430] [2021-10-24 10:31:15,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-10-24 10:31:15,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:31:15,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-10-24 10:31:15,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1100, Unknown=0, NotChecked=0, Total=1482 [2021-10-24 10:31:15,434 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 39 states, 37 states have (on average 2.027027027027027) internal successors, (75), 38 states have internal predecessors, (75), 19 states have call successors, (19), 1 states have call predecessors, (19), 17 states have return successors, (34), 17 states have call predecessors, (34), 19 states have call successors, (34) [2021-10-24 10:31:15,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:31:15,843 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2021-10-24 10:31:15,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-10-24 10:31:15,844 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 37 states have (on average 2.027027027027027) internal successors, (75), 38 states have internal predecessors, (75), 19 states have call successors, (19), 1 states have call predecessors, (19), 17 states have return successors, (34), 17 states have call predecessors, (34), 19 states have call successors, (34) Word has length 105 [2021-10-24 10:31:15,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:31:15,845 INFO L225 Difference]: With dead ends: 66 [2021-10-24 10:31:15,846 INFO L226 Difference]: Without dead ends: 62 [2021-10-24 10:31:15,847 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 744.2ms TimeCoverageRelationStatistics Valid=1011, Invalid=2069, Unknown=0, NotChecked=0, Total=3080 [2021-10-24 10:31:15,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-10-24 10:31:15,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-10-24 10:31:15,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 41 states have (on average 1.024390243902439) internal successors, (42), 42 states have internal predecessors, (42), 2 states have call successors, (2), 1 states have call predecessors, (2), 18 states have return successors, (19), 18 states have call predecessors, (19), 2 states have call successors, (19) [2021-10-24 10:31:15,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-10-24 10:31:15,854 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 105 [2021-10-24 10:31:15,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:31:15,855 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-10-24 10:31:15,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 37 states have (on average 2.027027027027027) internal successors, (75), 38 states have internal predecessors, (75), 19 states have call successors, (19), 1 states have call predecessors, (19), 17 states have return successors, (34), 17 states have call predecessors, (34), 19 states have call successors, (34) [2021-10-24 10:31:15,855 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-10-24 10:31:15,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-10-24 10:31:15,857 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:31:15,857 INFO L512 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:31:15,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-10-24 10:31:16,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-10-24 10:31:16,073 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:31:16,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:31:16,073 INFO L82 PathProgramCache]: Analyzing trace with hash -543729842, now seen corresponding path program 17 times [2021-10-24 10:31:16,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:31:16,074 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125091551] [2021-10-24 10:31:16,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:31:16,074 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:31:16,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:31:16,458 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-10-24 10:31:16,458 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:31:16,458 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125091551] [2021-10-24 10:31:16,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1125091551] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:31:16,458 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754769606] [2021-10-24 10:31:16,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-24 10:31:16,459 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:31:16,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:31:16,465 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:31:16,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-10-24 10:31:18,543 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-10-24 10:31:18,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:31:18,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 38 conjunts are in the unsatisfiable core [2021-10-24 10:31:18,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:31:18,938 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-10-24 10:31:18,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:31:37,156 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 731 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-10-24 10:31:37,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1754769606] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:31:37,157 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2120846012] [2021-10-24 10:31:37,159 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:31:37,159 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:31:37,159 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:31:37,160 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:31:37,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 39] total 41 [2021-10-24 10:31:37,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929355714] [2021-10-24 10:31:37,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-10-24 10:31:37,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:31:37,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-10-24 10:31:37,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=1218, Unknown=0, NotChecked=0, Total=1640 [2021-10-24 10:31:37,164 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 41 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 40 states have internal predecessors, (79), 20 states have call successors, (20), 1 states have call predecessors, (20), 18 states have return successors, (36), 18 states have call predecessors, (36), 20 states have call successors, (36) [2021-10-24 10:31:37,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:31:37,629 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2021-10-24 10:31:37,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-10-24 10:31:37,630 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 40 states have internal predecessors, (79), 20 states have call successors, (20), 1 states have call predecessors, (20), 18 states have return successors, (36), 18 states have call predecessors, (36), 20 states have call successors, (36) Word has length 111 [2021-10-24 10:31:37,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:31:37,631 INFO L225 Difference]: With dead ends: 69 [2021-10-24 10:31:37,632 INFO L226 Difference]: Without dead ends: 65 [2021-10-24 10:31:37,633 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 477 ImplicationChecksByTransitivity, 863.9ms TimeCoverageRelationStatistics Valid=1124, Invalid=2298, Unknown=0, NotChecked=0, Total=3422 [2021-10-24 10:31:37,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-10-24 10:31:37,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-10-24 10:31:37,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 44 states have internal predecessors, (44), 2 states have call successors, (2), 1 states have call predecessors, (2), 19 states have return successors, (20), 19 states have call predecessors, (20), 2 states have call successors, (20) [2021-10-24 10:31:37,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2021-10-24 10:31:37,640 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 111 [2021-10-24 10:31:37,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:31:37,641 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2021-10-24 10:31:37,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 40 states have internal predecessors, (79), 20 states have call successors, (20), 1 states have call predecessors, (20), 18 states have return successors, (36), 18 states have call predecessors, (36), 20 states have call successors, (36) [2021-10-24 10:31:37,642 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2021-10-24 10:31:37,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-10-24 10:31:37,643 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:31:37,643 INFO L512 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:31:37,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-10-24 10:31:37,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-10-24 10:31:37,857 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:31:37,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:31:37,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1011974276, now seen corresponding path program 18 times [2021-10-24 10:31:37,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:31:37,858 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843841991] [2021-10-24 10:31:37,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:31:37,858 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:31:37,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:31:38,250 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2021-10-24 10:31:38,250 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:31:38,250 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843841991] [2021-10-24 10:31:38,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843841991] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:31:38,251 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217130876] [2021-10-24 10:31:38,251 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-24 10:31:38,251 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:31:38,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:31:38,257 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:31:38,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-10-24 10:31:40,857 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-24 10:31:40,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:31:40,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 40 conjunts are in the unsatisfiable core [2021-10-24 10:31:40,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:31:41,178 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2021-10-24 10:31:41,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:32:03,413 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-10-24 10:32:03,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217130876] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:32:03,413 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [389465832] [2021-10-24 10:32:03,415 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:32:03,415 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:32:03,416 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:32:03,417 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:32:03,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 41] total 43 [2021-10-24 10:32:03,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727753779] [2021-10-24 10:32:03,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-10-24 10:32:03,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:32:03,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-10-24 10:32:03,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=1342, Unknown=0, NotChecked=0, Total=1806 [2021-10-24 10:32:03,421 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand has 43 states, 41 states have (on average 2.024390243902439) internal successors, (83), 42 states have internal predecessors, (83), 21 states have call successors, (21), 1 states have call predecessors, (21), 19 states have return successors, (38), 19 states have call predecessors, (38), 21 states have call successors, (38) [2021-10-24 10:32:03,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:32:03,915 INFO L93 Difference]: Finished difference Result 72 states and 73 transitions. [2021-10-24 10:32:03,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-10-24 10:32:03,915 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 41 states have (on average 2.024390243902439) internal successors, (83), 42 states have internal predecessors, (83), 21 states have call successors, (21), 1 states have call predecessors, (21), 19 states have return successors, (38), 19 states have call predecessors, (38), 21 states have call successors, (38) Word has length 117 [2021-10-24 10:32:03,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:32:03,916 INFO L225 Difference]: With dead ends: 72 [2021-10-24 10:32:03,917 INFO L226 Difference]: Without dead ends: 68 [2021-10-24 10:32:03,919 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 906.4ms TimeCoverageRelationStatistics Valid=1243, Invalid=2539, Unknown=0, NotChecked=0, Total=3782 [2021-10-24 10:32:03,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-10-24 10:32:03,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-10-24 10:32:03,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 45 states have (on average 1.0222222222222221) internal successors, (46), 46 states have internal predecessors, (46), 2 states have call successors, (2), 1 states have call predecessors, (2), 20 states have return successors, (21), 20 states have call predecessors, (21), 2 states have call successors, (21) [2021-10-24 10:32:03,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2021-10-24 10:32:03,925 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 117 [2021-10-24 10:32:03,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:32:03,926 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2021-10-24 10:32:03,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 41 states have (on average 2.024390243902439) internal successors, (83), 42 states have internal predecessors, (83), 21 states have call successors, (21), 1 states have call predecessors, (21), 19 states have return successors, (38), 19 states have call predecessors, (38), 21 states have call successors, (38) [2021-10-24 10:32:03,927 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2021-10-24 10:32:03,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-10-24 10:32:03,928 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:32:03,929 INFO L512 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:32:03,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-10-24 10:32:04,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:32:04,156 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:32:04,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:32:04,157 INFO L82 PathProgramCache]: Analyzing trace with hash 486282894, now seen corresponding path program 19 times [2021-10-24 10:32:04,157 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:32:04,157 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097373912] [2021-10-24 10:32:04,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:32:04,157 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:32:04,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:32:04,601 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-10-24 10:32:04,601 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:32:04,601 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097373912] [2021-10-24 10:32:04,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097373912] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:32:04,601 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696578] [2021-10-24 10:32:04,602 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-24 10:32:04,602 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:32:04,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:32:04,604 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:32:04,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-10-24 10:32:07,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:32:07,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 42 conjunts are in the unsatisfiable core [2021-10-24 10:32:07,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:32:07,379 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-10-24 10:32:07,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:32:32,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 912 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-10-24 10:32:32,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [696578] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:32:32,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [423946948] [2021-10-24 10:32:32,149 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:32:32,149 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:32:32,150 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:32:32,151 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:32:32,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 43] total 45 [2021-10-24 10:32:32,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169491452] [2021-10-24 10:32:32,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-10-24 10:32:32,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:32:32,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-10-24 10:32:32,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=1472, Unknown=0, NotChecked=0, Total=1980 [2021-10-24 10:32:32,154 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 45 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 44 states have internal predecessors, (87), 22 states have call successors, (22), 1 states have call predecessors, (22), 20 states have return successors, (40), 20 states have call predecessors, (40), 22 states have call successors, (40) [2021-10-24 10:32:32,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:32:32,642 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2021-10-24 10:32:32,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-10-24 10:32:32,657 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 44 states have internal predecessors, (87), 22 states have call successors, (22), 1 states have call predecessors, (22), 20 states have return successors, (40), 20 states have call predecessors, (40), 22 states have call successors, (40) Word has length 123 [2021-10-24 10:32:32,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:32:32,659 INFO L225 Difference]: With dead ends: 75 [2021-10-24 10:32:32,659 INFO L226 Difference]: Without dead ends: 71 [2021-10-24 10:32:32,661 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 870.8ms TimeCoverageRelationStatistics Valid=1368, Invalid=2792, Unknown=0, NotChecked=0, Total=4160 [2021-10-24 10:32:32,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-10-24 10:32:32,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-10-24 10:32:32,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 48 states have internal predecessors, (48), 2 states have call successors, (2), 1 states have call predecessors, (2), 21 states have return successors, (22), 21 states have call predecessors, (22), 2 states have call successors, (22) [2021-10-24 10:32:32,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-10-24 10:32:32,667 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 123 [2021-10-24 10:32:32,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:32:32,668 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-10-24 10:32:32,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 44 states have internal predecessors, (87), 22 states have call successors, (22), 1 states have call predecessors, (22), 20 states have return successors, (40), 20 states have call predecessors, (40), 22 states have call successors, (40) [2021-10-24 10:32:32,669 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-10-24 10:32:32,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-10-24 10:32:32,670 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:32:32,670 INFO L512 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:32:32,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-10-24 10:32:32,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:32:32,894 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:32:32,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:32:32,895 INFO L82 PathProgramCache]: Analyzing trace with hash 1510268740, now seen corresponding path program 20 times [2021-10-24 10:32:32,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:32:32,895 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86254428] [2021-10-24 10:32:32,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:32:32,895 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:32:32,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:32:33,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2021-10-24 10:32:33,311 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:32:33,311 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86254428] [2021-10-24 10:32:33,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86254428] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:32:33,311 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027504685] [2021-10-24 10:32:33,311 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-24 10:32:33,311 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:32:33,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:32:33,312 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:32:33,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-10-24 10:32:36,505 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-10-24 10:32:36,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:32:36,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 88 conjunts are in the unsatisfiable core [2021-10-24 10:32:36,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:32:37,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2021-10-24 10:32:37,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:33:53,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2021-10-24 10:33:53,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027504685] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:33:53,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415869597] [2021-10-24 10:33:53,349 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:33:53,349 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:33:53,349 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:33:53,351 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:33:53,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 47, 47] total 72 [2021-10-24 10:33:53,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131998162] [2021-10-24 10:33:53,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-10-24 10:33:53,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:33:53,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-10-24 10:33:53,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=758, Invalid=4354, Unknown=0, NotChecked=0, Total=5112 [2021-10-24 10:33:53,355 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 72 states, 70 states have (on average 1.3857142857142857) internal successors, (97), 49 states have internal predecessors, (97), 4 states have call successors, (4), 1 states have call predecessors, (4), 42 states have return successors, (43), 43 states have call predecessors, (43), 4 states have call successors, (43) [2021-10-24 10:33:55,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:33:55,008 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2021-10-24 10:33:55,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-10-24 10:33:55,009 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 70 states have (on average 1.3857142857142857) internal successors, (97), 49 states have internal predecessors, (97), 4 states have call successors, (4), 1 states have call predecessors, (4), 42 states have return successors, (43), 43 states have call predecessors, (43), 4 states have call successors, (43) Word has length 129 [2021-10-24 10:33:55,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:33:55,010 INFO L225 Difference]: With dead ends: 78 [2021-10-24 10:33:55,010 INFO L226 Difference]: Without dead ends: 74 [2021-10-24 10:33:55,016 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 231 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2428 ImplicationChecksByTransitivity, 2841.0ms TimeCoverageRelationStatistics Valid=2249, Invalid=10633, Unknown=0, NotChecked=0, Total=12882 [2021-10-24 10:33:55,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-10-24 10:33:55,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-10-24 10:33:55,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 49 states have (on average 1.0204081632653061) internal successors, (50), 50 states have internal predecessors, (50), 2 states have call successors, (2), 1 states have call predecessors, (2), 22 states have return successors, (23), 22 states have call predecessors, (23), 2 states have call successors, (23) [2021-10-24 10:33:55,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2021-10-24 10:33:55,022 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 129 [2021-10-24 10:33:55,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:33:55,023 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2021-10-24 10:33:55,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 70 states have (on average 1.3857142857142857) internal successors, (97), 49 states have internal predecessors, (97), 4 states have call successors, (4), 1 states have call predecessors, (4), 42 states have return successors, (43), 43 states have call predecessors, (43), 4 states have call successors, (43) [2021-10-24 10:33:55,024 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2021-10-24 10:33:55,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-10-24 10:33:55,025 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:33:55,025 INFO L512 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:33:55,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-10-24 10:33:55,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:33:55,241 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:33:55,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:33:55,241 INFO L82 PathProgramCache]: Analyzing trace with hash -92396082, now seen corresponding path program 21 times [2021-10-24 10:33:55,241 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:33:55,242 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60849971] [2021-10-24 10:33:55,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:33:55,242 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:33:55,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:33:55,763 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2021-10-24 10:33:55,763 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:33:55,763 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60849971] [2021-10-24 10:33:55,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60849971] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:33:55,763 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793453056] [2021-10-24 10:33:55,763 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-24 10:33:55,763 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:33:55,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:33:55,764 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:33:55,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-10-24 10:33:59,632 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-24 10:33:59,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:33:59,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 46 conjunts are in the unsatisfiable core [2021-10-24 10:33:59,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:34:00,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2021-10-24 10:34:00,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:34:30,912 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 1113 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-10-24 10:34:30,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793453056] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:34:30,913 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [243991252] [2021-10-24 10:34:30,914 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:34:30,914 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:34:30,914 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:34:30,915 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:34:30,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 47] total 49 [2021-10-24 10:34:30,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028751601] [2021-10-24 10:34:30,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-10-24 10:34:30,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:34:30,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-10-24 10:34:30,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=602, Invalid=1750, Unknown=0, NotChecked=0, Total=2352 [2021-10-24 10:34:30,917 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 49 states, 47 states have (on average 2.021276595744681) internal successors, (95), 48 states have internal predecessors, (95), 24 states have call successors, (24), 1 states have call predecessors, (24), 22 states have return successors, (44), 22 states have call predecessors, (44), 24 states have call successors, (44) [2021-10-24 10:34:31,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:34:31,449 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2021-10-24 10:34:31,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-24 10:34:31,450 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 47 states have (on average 2.021276595744681) internal successors, (95), 48 states have internal predecessors, (95), 24 states have call successors, (24), 1 states have call predecessors, (24), 22 states have return successors, (44), 22 states have call predecessors, (44), 24 states have call successors, (44) Word has length 135 [2021-10-24 10:34:31,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:34:31,451 INFO L225 Difference]: With dead ends: 81 [2021-10-24 10:34:31,451 INFO L226 Difference]: Without dead ends: 77 [2021-10-24 10:34:31,452 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 268 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 1063.3ms TimeCoverageRelationStatistics Valid=1636, Invalid=3334, Unknown=0, NotChecked=0, Total=4970 [2021-10-24 10:34:31,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-10-24 10:34:31,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-10-24 10:34:31,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 51 states have (on average 1.0196078431372548) internal successors, (52), 52 states have internal predecessors, (52), 2 states have call successors, (2), 1 states have call predecessors, (2), 23 states have return successors, (24), 23 states have call predecessors, (24), 2 states have call successors, (24) [2021-10-24 10:34:31,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2021-10-24 10:34:31,457 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 135 [2021-10-24 10:34:31,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:34:31,457 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2021-10-24 10:34:31,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 47 states have (on average 2.021276595744681) internal successors, (95), 48 states have internal predecessors, (95), 24 states have call successors, (24), 1 states have call predecessors, (24), 22 states have return successors, (44), 22 states have call predecessors, (44), 24 states have call successors, (44) [2021-10-24 10:34:31,458 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2021-10-24 10:34:31,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-10-24 10:34:31,459 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:34:31,459 INFO L512 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:34:31,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-10-24 10:34:31,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-10-24 10:34:31,665 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:34:31,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:34:31,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1661997564, now seen corresponding path program 22 times [2021-10-24 10:34:31,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:34:31,665 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914986123] [2021-10-24 10:34:31,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:34:31,666 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:34:31,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:34:32,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2021-10-24 10:34:32,061 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:34:32,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914986123] [2021-10-24 10:34:32,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914986123] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:34:32,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [739426764] [2021-10-24 10:34:32,062 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-24 10:34:32,062 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:34:32,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:34:32,063 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:34:32,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-10-24 10:34:36,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:34:36,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 48 conjunts are in the unsatisfiable core [2021-10-24 10:34:36,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:34:36,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2021-10-24 10:34:36,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:35:12,713 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 1221 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-10-24 10:35:12,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [739426764] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:35:12,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70391900] [2021-10-24 10:35:12,714 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:35:12,714 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:35:12,714 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:35:12,715 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:35:12,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 49] total 51 [2021-10-24 10:35:12,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076202018] [2021-10-24 10:35:12,717 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-10-24 10:35:12,717 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:35:12,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-10-24 10:35:12,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=1898, Unknown=0, NotChecked=0, Total=2550 [2021-10-24 10:35:12,719 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand has 51 states, 49 states have (on average 2.020408163265306) internal successors, (99), 50 states have internal predecessors, (99), 25 states have call successors, (25), 1 states have call predecessors, (25), 23 states have return successors, (46), 23 states have call predecessors, (46), 25 states have call successors, (46) [2021-10-24 10:35:13,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:35:13,218 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2021-10-24 10:35:13,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-10-24 10:35:13,219 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 49 states have (on average 2.020408163265306) internal successors, (99), 50 states have internal predecessors, (99), 25 states have call successors, (25), 1 states have call predecessors, (25), 23 states have return successors, (46), 23 states have call predecessors, (46), 25 states have call successors, (46) Word has length 141 [2021-10-24 10:35:13,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:35:13,220 INFO L225 Difference]: With dead ends: 84 [2021-10-24 10:35:13,220 INFO L226 Difference]: Without dead ends: 80 [2021-10-24 10:35:13,221 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 782 ImplicationChecksByTransitivity, 1032.0ms TimeCoverageRelationStatistics Valid=1779, Invalid=3623, Unknown=0, NotChecked=0, Total=5402 [2021-10-24 10:35:13,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-10-24 10:35:13,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-10-24 10:35:13,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 53 states have (on average 1.0188679245283019) internal successors, (54), 54 states have internal predecessors, (54), 2 states have call successors, (2), 1 states have call predecessors, (2), 24 states have return successors, (25), 24 states have call predecessors, (25), 2 states have call successors, (25) [2021-10-24 10:35:13,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2021-10-24 10:35:13,253 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 141 [2021-10-24 10:35:13,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:35:13,255 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2021-10-24 10:35:13,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 49 states have (on average 2.020408163265306) internal successors, (99), 50 states have internal predecessors, (99), 25 states have call successors, (25), 1 states have call predecessors, (25), 23 states have return successors, (46), 23 states have call predecessors, (46), 25 states have call successors, (46) [2021-10-24 10:35:13,256 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2021-10-24 10:35:13,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-10-24 10:35:13,257 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:35:13,257 INFO L512 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:35:13,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-10-24 10:35:13,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:35:13,458 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:35:13,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:35:13,459 INFO L82 PathProgramCache]: Analyzing trace with hash 675382542, now seen corresponding path program 23 times [2021-10-24 10:35:13,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:35:13,459 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604274870] [2021-10-24 10:35:13,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:35:13,459 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:35:13,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:35:13,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2021-10-24 10:35:13,927 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:35:13,927 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604274870] [2021-10-24 10:35:13,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604274870] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:35:13,928 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72123251] [2021-10-24 10:35:13,928 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-24 10:35:13,928 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:35:13,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:35:13,929 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:35:13,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-10-24 10:35:18,963 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-10-24 10:35:18,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:35:18,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 50 conjunts are in the unsatisfiable core [2021-10-24 10:35:18,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:35:19,383 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2021-10-24 10:35:19,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:36:02,127 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 1334 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-10-24 10:36:02,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72123251] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:36:02,128 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1343296140] [2021-10-24 10:36:02,129 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:36:02,130 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:36:02,130 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:36:02,130 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:36:02,130 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 51] total 53 [2021-10-24 10:36:02,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098225900] [2021-10-24 10:36:02,131 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-10-24 10:36:02,131 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:36:02,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-10-24 10:36:02,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=704, Invalid=2052, Unknown=0, NotChecked=0, Total=2756 [2021-10-24 10:36:02,133 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 53 states, 51 states have (on average 2.019607843137255) internal successors, (103), 52 states have internal predecessors, (103), 26 states have call successors, (26), 1 states have call predecessors, (26), 24 states have return successors, (48), 24 states have call predecessors, (48), 26 states have call successors, (48) [2021-10-24 10:36:02,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:36:02,914 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2021-10-24 10:36:02,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-10-24 10:36:02,915 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 51 states have (on average 2.019607843137255) internal successors, (103), 52 states have internal predecessors, (103), 26 states have call successors, (26), 1 states have call predecessors, (26), 24 states have return successors, (48), 24 states have call predecessors, (48), 26 states have call successors, (48) Word has length 147 [2021-10-24 10:36:02,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:36:02,916 INFO L225 Difference]: With dead ends: 87 [2021-10-24 10:36:02,916 INFO L226 Difference]: Without dead ends: 83 [2021-10-24 10:36:02,917 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 852 ImplicationChecksByTransitivity, 1196.6ms TimeCoverageRelationStatistics Valid=1928, Invalid=3924, Unknown=0, NotChecked=0, Total=5852 [2021-10-24 10:36:02,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-24 10:36:02,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-10-24 10:36:02,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 55 states have (on average 1.018181818181818) internal successors, (56), 56 states have internal predecessors, (56), 2 states have call successors, (2), 1 states have call predecessors, (2), 25 states have return successors, (26), 25 states have call predecessors, (26), 2 states have call successors, (26) [2021-10-24 10:36:02,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-10-24 10:36:02,923 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 147 [2021-10-24 10:36:02,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:36:02,924 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-10-24 10:36:02,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 51 states have (on average 2.019607843137255) internal successors, (103), 52 states have internal predecessors, (103), 26 states have call successors, (26), 1 states have call predecessors, (26), 24 states have return successors, (48), 24 states have call predecessors, (48), 26 states have call successors, (48) [2021-10-24 10:36:02,924 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-10-24 10:36:02,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-10-24 10:36:02,926 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:36:02,926 INFO L512 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:36:02,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-10-24 10:36:03,145 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-10-24 10:36:03,145 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:36:03,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:36:03,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1206824132, now seen corresponding path program 24 times [2021-10-24 10:36:03,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:36:03,146 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119158542] [2021-10-24 10:36:03,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:36:03,146 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:36:03,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-24 10:36:03,819 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2021-10-24 10:36:03,819 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-24 10:36:03,819 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119158542] [2021-10-24 10:36:03,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119158542] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-24 10:36:03,819 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727031874] [2021-10-24 10:36:03,819 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-24 10:36:03,820 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-24 10:36:03,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 [2021-10-24 10:36:03,825 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-24 10:36:03,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-10-24 10:36:09,960 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-24 10:36:09,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-24 10:36:09,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 52 conjunts are in the unsatisfiable core [2021-10-24 10:36:10,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-24 10:36:10,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2021-10-24 10:36:10,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-24 10:37:02,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 1452 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-10-24 10:37:02,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1727031874] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-24 10:37:02,322 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1906713031] [2021-10-24 10:37:02,323 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-10-24 10:37:02,323 INFO L166 IcfgInterpreter]: Building call graph [2021-10-24 10:37:02,323 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-24 10:37:02,323 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-10-24 10:37:02,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 53] total 54 [2021-10-24 10:37:02,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840526700] [2021-10-24 10:37:02,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-10-24 10:37:02,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-24 10:37:02,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-10-24 10:37:02,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=755, Invalid=2107, Unknown=0, NotChecked=0, Total=2862 [2021-10-24 10:37:02,327 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 54 states, 53 states have (on average 2.0) internal successors, (106), 53 states have internal predecessors, (106), 26 states have call successors, (26), 1 states have call predecessors, (26), 25 states have return successors, (49), 25 states have call predecessors, (49), 26 states have call successors, (49) [2021-10-24 10:37:02,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-24 10:37:02,856 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2021-10-24 10:37:02,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-10-24 10:37:02,857 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 2.0) internal successors, (106), 53 states have internal predecessors, (106), 26 states have call successors, (26), 1 states have call predecessors, (26), 25 states have return successors, (49), 25 states have call predecessors, (49), 26 states have call successors, (49) Word has length 153 [2021-10-24 10:37:02,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-24 10:37:02,862 INFO L225 Difference]: With dead ends: 90 [2021-10-24 10:37:02,862 INFO L226 Difference]: Without dead ends: 86 [2021-10-24 10:37:02,863 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 303 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 876 ImplicationChecksByTransitivity, 1400.5ms TimeCoverageRelationStatistics Valid=2080, Invalid=4082, Unknown=0, NotChecked=0, Total=6162 [2021-10-24 10:37:02,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-10-24 10:37:02,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-10-24 10:37:02,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 57 states have (on average 1.0175438596491229) internal successors, (58), 58 states have internal predecessors, (58), 2 states have call successors, (2), 1 states have call predecessors, (2), 26 states have return successors, (27), 26 states have call predecessors, (27), 2 states have call successors, (27) [2021-10-24 10:37:02,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2021-10-24 10:37:02,870 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 153 [2021-10-24 10:37:02,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-24 10:37:02,871 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2021-10-24 10:37:02,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 2.0) internal successors, (106), 53 states have internal predecessors, (106), 26 states have call successors, (26), 1 states have call predecessors, (26), 25 states have return successors, (49), 25 states have call predecessors, (49), 26 states have call successors, (49) [2021-10-24 10:37:02,871 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2021-10-24 10:37:02,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-10-24 10:37:02,872 INFO L504 BasicCegarLoop]: Found error trace [2021-10-24 10:37:02,873 INFO L512 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1] [2021-10-24 10:37:02,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-10-24 10:37:03,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-10-24 10:37:03,085 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-24 10:37:03,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-24 10:37:03,085 INFO L82 PathProgramCache]: Analyzing trace with hash -1687538610, now seen corresponding path program 25 times [2021-10-24 10:37:03,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-24 10:37:03,085 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [510874230] [2021-10-24 10:37:03,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-24 10:37:03,086 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-24 10:37:03,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-24 10:37:03,246 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-24 10:37:03,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-24 10:37:03,604 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-10-24 10:37:03,604 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-10-24 10:37:03,605 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-24 10:37:03,607 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-10-24 10:37:03,617 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-24 10:37:03,770 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 10:37:03 BoogieIcfgContainer [2021-10-24 10:37:03,771 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-24 10:37:03,772 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-24 10:37:03,772 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-24 10:37:03,772 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-24 10:37:03,773 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 10:29:33" (3/4) ... [2021-10-24 10:37:03,775 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-24 10:37:03,886 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/witness.graphml [2021-10-24 10:37:03,886 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-24 10:37:03,888 INFO L168 Benchmark]: Toolchain (without parser) took 450646.76 ms. Allocated memory was 104.9 MB in the beginning and 906.0 MB in the end (delta: 801.1 MB). Free memory was 71.0 MB in the beginning and 258.1 MB in the end (delta: -187.1 MB). Peak memory consumption was 611.8 MB. Max. memory is 16.1 GB. [2021-10-24 10:37:03,889 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 104.9 MB. Free memory is still 57.4 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-24 10:37:03,890 INFO L168 Benchmark]: CACSL2BoogieTranslator took 246.03 ms. Allocated memory is still 104.9 MB. Free memory was 70.8 MB in the beginning and 80.3 MB in the end (delta: -9.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-24 10:37:03,890 INFO L168 Benchmark]: Boogie Procedure Inliner took 28.19 ms. Allocated memory is still 104.9 MB. Free memory was 80.3 MB in the beginning and 78.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-24 10:37:03,890 INFO L168 Benchmark]: Boogie Preprocessor took 18.61 ms. Allocated memory is still 104.9 MB. Free memory was 78.9 MB in the beginning and 77.8 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-24 10:37:03,891 INFO L168 Benchmark]: RCFGBuilder took 289.07 ms. Allocated memory is still 104.9 MB. Free memory was 77.8 MB in the beginning and 68.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-24 10:37:03,891 INFO L168 Benchmark]: TraceAbstraction took 449943.38 ms. Allocated memory was 104.9 MB in the beginning and 906.0 MB in the end (delta: 801.1 MB). Free memory was 67.8 MB in the beginning and 265.5 MB in the end (delta: -197.7 MB). Peak memory consumption was 811.7 MB. Max. memory is 16.1 GB. [2021-10-24 10:37:03,892 INFO L168 Benchmark]: Witness Printer took 114.67 ms. Allocated memory is still 906.0 MB. Free memory was 265.5 MB in the beginning and 258.1 MB in the end (delta: 7.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-24 10:37:03,900 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 104.9 MB. Free memory is still 57.4 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 246.03 ms. Allocated memory is still 104.9 MB. Free memory was 70.8 MB in the beginning and 80.3 MB in the end (delta: -9.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 28.19 ms. Allocated memory is still 104.9 MB. Free memory was 80.3 MB in the beginning and 78.9 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.61 ms. Allocated memory is still 104.9 MB. Free memory was 78.9 MB in the beginning and 77.8 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 289.07 ms. Allocated memory is still 104.9 MB. Free memory was 77.8 MB in the beginning and 68.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 449943.38 ms. Allocated memory was 104.9 MB in the beginning and 906.0 MB in the end (delta: 801.1 MB). Free memory was 67.8 MB in the beginning and 265.5 MB in the end (delta: -197.7 MB). Peak memory consumption was 811.7 MB. Max. memory is 16.1 GB. * Witness Printer took 114.67 ms. Allocated memory is still 906.0 MB. Free memory was 265.5 MB in the beginning and 258.1 MB in the end (delta: 7.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 18]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L14] int a = 25; [L15] int b = 0; [L16] CALL, EXPR sum(a, b) VAL [\old(m)=0, \old(n)=25] [L6] COND FALSE !(n <= 0) VAL [\old(m)=0, \old(n)=25, m=0, n=25] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=24] [L6] COND FALSE !(n <= 0) VAL [\old(m)=1, \old(n)=24, m=1, n=24] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=23] [L6] COND FALSE !(n <= 0) VAL [\old(m)=2, \old(n)=23, m=2, n=23] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=22] [L6] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=22, m=3, n=22] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=21] [L6] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=21, m=4, n=21] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=20] [L6] COND FALSE !(n <= 0) VAL [\old(m)=5, \old(n)=20, m=5, n=20] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=19] [L6] COND FALSE !(n <= 0) VAL [\old(m)=6, \old(n)=19, m=6, n=19] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=18] [L6] COND FALSE !(n <= 0) VAL [\old(m)=7, \old(n)=18, m=7, n=18] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=17] [L6] COND FALSE !(n <= 0) VAL [\old(m)=8, \old(n)=17, m=8, n=17] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=16] [L6] COND FALSE !(n <= 0) VAL [\old(m)=9, \old(n)=16, m=9, n=16] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=15] [L6] COND FALSE !(n <= 0) VAL [\old(m)=10, \old(n)=15, m=10, n=15] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=14] [L6] COND FALSE !(n <= 0) VAL [\old(m)=11, \old(n)=14, m=11, n=14] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=13] [L6] COND FALSE !(n <= 0) VAL [\old(m)=12, \old(n)=13, m=12, n=13] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=12] [L6] COND FALSE !(n <= 0) VAL [\old(m)=13, \old(n)=12, m=13, n=12] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=11] [L6] COND FALSE !(n <= 0) VAL [\old(m)=14, \old(n)=11, m=14, n=11] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=15, \old(n)=10] [L6] COND FALSE !(n <= 0) VAL [\old(m)=15, \old(n)=10, m=15, n=10] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=16, \old(n)=9] [L6] COND FALSE !(n <= 0) VAL [\old(m)=16, \old(n)=9, m=16, n=9] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=17, \old(n)=8] [L6] COND FALSE !(n <= 0) VAL [\old(m)=17, \old(n)=8, m=17, n=8] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=18, \old(n)=7] [L6] COND FALSE !(n <= 0) VAL [\old(m)=18, \old(n)=7, m=18, n=7] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=19, \old(n)=6] [L6] COND FALSE !(n <= 0) VAL [\old(m)=19, \old(n)=6, m=19, n=6] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=20, \old(n)=5] [L6] COND FALSE !(n <= 0) VAL [\old(m)=20, \old(n)=5, m=20, n=5] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=21, \old(n)=4] [L6] COND FALSE !(n <= 0) VAL [\old(m)=21, \old(n)=4, m=21, n=4] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=22, \old(n)=3] [L6] COND FALSE !(n <= 0) VAL [\old(m)=22, \old(n)=3, m=22, n=3] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=23, \old(n)=2] [L6] COND FALSE !(n <= 0) VAL [\old(m)=23, \old(n)=2, m=23, n=2] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=24, \old(n)=1] [L6] COND FALSE !(n <= 0) VAL [\old(m)=24, \old(n)=1, m=24, n=1] [L9] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=25, \old(n)=0] [L6] COND TRUE n <= 0 [L7] return m + n; VAL [\old(m)=25, \old(n)=0, \result=25, m=25, n=0] [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=24, \old(n)=1, m=24, n=1, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=23, \old(n)=2, m=23, n=2, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=22, \old(n)=3, m=22, n=3, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=21, \old(n)=4, m=21, n=4, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=20, \old(n)=5, m=20, n=5, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=19, \old(n)=6, m=19, n=6, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=18, \old(n)=7, m=18, n=7, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=17, \old(n)=8, m=17, n=8, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=16, \old(n)=9, m=16, n=9, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=15, \old(n)=10, m=15, n=10, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=14, \old(n)=11, m=14, n=11, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=13, \old(n)=12, m=13, n=12, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=12, \old(n)=13, m=12, n=13, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=11, \old(n)=14, m=11, n=14, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=10, \old(n)=15, m=10, n=15, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=9, \old(n)=16, m=9, n=16, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=8, \old(n)=17, m=8, n=17, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=7, \old(n)=18, m=7, n=18, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=6, \old(n)=19, m=6, n=19, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=20, m=5, n=20, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=21, m=4, n=21, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=22, m=3, n=22, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=2, \old(n)=23, m=2, n=23, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=1, \old(n)=24, m=1, n=24, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L9] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=0, \old(n)=25, m=0, n=25, sum(n - 1, m + 1)=25] [L9] return sum(n - 1, m + 1); [L16] RET, EXPR sum(a, b) [L16] int result = sum(a, b); [L17] COND TRUE result == a + b [L18] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 14 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 449681.2ms, OverallIterations: 26, TraceHistogramMax: 26, EmptinessCheckTime: 83.6ms, AutomataDifference: 9264.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 20.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 199 SDtfs, 6088 SDslu, 1895 SDs, 0 SdLazy, 2350 SolverSat, 2880 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2553.4ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5064 GetRequests, 3947 SyntacticMatches, 2 SemanticMatches, 1115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10231 ImplicationChecksByTransitivity, 16280.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=86occurred in iteration=25, InterpolantAutomatonStates: 453, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 228.2ms AutomataMinimizationTime, 25 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 297.6ms SsaConstructionTime, 1736.9ms SatisfiabilityAnalysisTime, 393575.8ms InterpolantComputationTime, 4200 NumberOfCodeBlocks, 4200 NumberOfCodeBlocksAsserted, 158 NumberOfCheckSat, 5984 ConstructedInterpolants, 0 QuantifiedInterpolants, 18216 SizeOfPredicates, 334 NumberOfNonLiveVariables, 6792 ConjunctsInSsa, 760 ConjunctsInUnsatCore, 73 InterpolantComputations, 1 PerfectInterpolantSequences, 18064/45000 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-10-24 10:37:04,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d63eaf76-4bb3-472a-aed3-7817e8063445/bin/utaipan-9zjyvhn0QE/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...