./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/Ackermann03.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann03.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF --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 c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:05:58,731 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:05:58,735 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:05:58,798 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:05:58,799 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:05:58,804 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:05:58,806 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:05:58,810 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:05:58,813 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:05:58,820 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:05:58,821 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:05:58,824 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:05:58,824 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:05:58,827 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:05:58,830 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:05:58,839 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:05:58,841 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:05:58,842 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:05:58,845 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:05:58,854 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:05:58,856 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:05:58,858 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:05:58,861 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:05:58,863 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:05:58,873 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:05:58,874 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:05:58,874 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:05:58,877 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:05:58,877 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:05:58,879 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:05:58,880 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:05:58,881 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:05:58,883 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:05:58,885 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:05:58,887 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:05:58,887 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:05:58,888 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:05:58,888 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:05:58,888 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:05:58,890 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:05:58,890 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:05:58,891 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 23:05:58,939 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:05:58,940 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:05:58,941 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:05:58,942 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:05:58,942 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:05:58,942 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:05:58,942 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:05:58,942 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 23:05:58,943 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:05:58,943 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:05:58,944 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 23:05:58,944 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 23:05:58,945 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:05:58,945 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 23:05:58,945 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 23:05:58,945 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 23:05:58,946 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:05:58,946 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 23:05:58,947 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 23:05:58,947 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 23:05:58,947 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:05:58,947 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:05:58,947 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:05:58,948 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:05:58,948 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:05:58,948 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 23:05:58,948 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:05:58,949 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:05:58,949 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:05:58,949 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:05:58,949 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:05:58,949 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:05:58,950 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:05:58,950 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:05:58,950 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:05:58,951 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 23:05:58,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 23:05:58,951 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:05:58,951 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:05:58,951 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:05:58,952 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_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd [2021-11-12 23:05:59,292 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:05:59,330 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:05:59,333 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:05:59,335 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:05:59,335 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:05:59,337 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/recursive/Ackermann03.c [2021-11-12 23:05:59,431 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/data/f04133f17/2072890efec24322aaad96166ffc08cb/FLAG2d5cce03b [2021-11-12 23:05:59,924 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:05:59,924 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/sv-benchmarks/c/recursive/Ackermann03.c [2021-11-12 23:05:59,933 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/data/f04133f17/2072890efec24322aaad96166ffc08cb/FLAG2d5cce03b [2021-11-12 23:06:00,303 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/data/f04133f17/2072890efec24322aaad96166ffc08cb [2021-11-12 23:06:00,305 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:06:00,307 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:06:00,313 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:06:00,313 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:06:00,317 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:06:00,318 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,319 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2996571a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00, skipping insertion in model container [2021-11-12 23:06:00,319 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,327 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:06:00,343 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:06:00,518 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_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/sv-benchmarks/c/recursive/Ackermann03.c[1168,1181] [2021-11-12 23:06:00,521 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:06:00,529 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 23:06:00,545 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_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/sv-benchmarks/c/recursive/Ackermann03.c[1168,1181] [2021-11-12 23:06:00,546 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:06:00,558 INFO L208 MainTranslator]: Completed translation [2021-11-12 23:06:00,558 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00 WrapperNode [2021-11-12 23:06:00,558 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:06:00,559 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 23:06:00,560 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 23:06:00,560 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 23:06:00,567 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,574 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,591 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 23:06:00,592 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 23:06:00,592 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 23:06:00,593 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 23:06:00,600 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,601 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,602 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,602 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,606 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,608 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,609 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,611 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 23:06:00,612 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 23:06:00,612 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 23:06:00,612 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 23:06:00,613 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00" (1/1) ... [2021-11-12 23:06:00,620 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:06:00,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:00,643 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 23:06:00,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 23:06:00,691 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 23:06:00,692 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 23:06:00,692 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2021-11-12 23:06:00,692 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2021-11-12 23:06:00,692 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 23:06:00,692 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 23:06:00,898 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 23:06:00,912 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-12 23:06:00,914 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:06:00 BoogieIcfgContainer [2021-11-12 23:06:00,915 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 23:06:00,916 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 23:06:00,916 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 23:06:00,920 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 23:06:00,929 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 11:06:00" (1/3) ... [2021-11-12 23:06:00,930 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17ad787e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:06:00, skipping insertion in model container [2021-11-12 23:06:00,930 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:06:00" (2/3) ... [2021-11-12 23:06:00,931 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17ad787e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:06:00, skipping insertion in model container [2021-11-12 23:06:00,931 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:06:00" (3/3) ... [2021-11-12 23:06:00,932 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann03.c [2021-11-12 23:06:00,938 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 23:06:00,952 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 23:06:01,014 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 23:06:01,022 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 [2021-11-12 23:06:01,022 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 23:06:01,061 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-12 23:06:01,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-12 23:06:01,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:01,072 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:01,073 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:01,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:01,084 INFO L85 PathProgramCache]: Analyzing trace with hash 1538870455, now seen corresponding path program 1 times [2021-11-12 23:06:01,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:01,096 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974401342] [2021-11-12 23:06:01,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:01,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:01,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:01,288 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:06:01,288 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:01,289 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974401342] [2021-11-12 23:06:01,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1974401342] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:06:01,290 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:06:01,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-12 23:06:01,292 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335710732] [2021-11-12 23:06:01,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:06:01,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:06:01,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:01,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:06:01,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-12 23:06:01,344 INFO L87 Difference]: Start difference. First operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 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) [2021-11-12 23:06:01,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:01,510 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2021-11-12 23:06:01,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:06:01,514 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 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 11 [2021-11-12 23:06:01,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:01,523 INFO L225 Difference]: With dead ends: 34 [2021-11-12 23:06:01,524 INFO L226 Difference]: Without dead ends: 24 [2021-11-12 23:06:01,527 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:06:01,537 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 14 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 88.13ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.22ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 107.95ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:01,539 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 52 Invalid, 55 Unknown, 0 Unchecked, 7.22ms Time], IncrementalHoareTripleChecker [5 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 107.95ms Time] [2021-11-12 23:06:01,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-12 23:06:01,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-12 23:06:01,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-12 23:06:01,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-12 23:06:01,592 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 11 [2021-11-12 23:06:01,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:01,593 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-12 23:06:01,594 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 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) [2021-11-12 23:06:01,594 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-12 23:06:01,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-12 23:06:01,598 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:01,599 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:01,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 23:06:01,600 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:01,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:01,605 INFO L85 PathProgramCache]: Analyzing trace with hash -108557995, now seen corresponding path program 1 times [2021-11-12 23:06:01,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:01,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210096481] [2021-11-12 23:06:01,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:01,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:01,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:01,752 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:06:01,753 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:01,753 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210096481] [2021-11-12 23:06:01,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210096481] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:01,754 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775138244] [2021-11-12 23:06:01,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:01,755 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:01,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:01,758 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:01,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 23:06:01,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:01,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:06:01,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:01,981 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:06:01,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:02,192 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:06:02,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [775138244] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:02,193 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [402121647] [2021-11-12 23:06:02,222 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-12 23:06:02,223 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:02,228 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:610) 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) [2021-11-12 23:06:02,232 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:02,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-12 23:06:02,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021477173] [2021-11-12 23:06:02,237 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:02,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 23:06:02,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:02,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 23:06:02,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:06:02,240 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-12 23:06:02,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:02,411 INFO L93 Difference]: Finished difference Result 64 states and 114 transitions. [2021-11-12 23:06:02,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 23:06:02,424 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 18 [2021-11-12 23:06:02,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:02,428 INFO L225 Difference]: With dead ends: 64 [2021-11-12 23:06:02,428 INFO L226 Difference]: Without dead ends: 40 [2021-11-12 23:06:02,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:06:02,431 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 22 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 98.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.88ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 123.71ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:02,432 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 50 Invalid, 87 Unknown, 0 Unchecked, 2.88ms Time], IncrementalHoareTripleChecker [14 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 123.71ms Time] [2021-11-12 23:06:02,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-12 23:06:02,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-12 23:06:02,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 27 states have internal predecessors, (30), 8 states have call successors, (8), 2 states have call predecessors, (8), 5 states have return successors, (27), 10 states have call predecessors, (27), 8 states have call successors, (27) [2021-11-12 23:06:02,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 65 transitions. [2021-11-12 23:06:02,465 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 65 transitions. Word has length 18 [2021-11-12 23:06:02,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:02,465 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 65 transitions. [2021-11-12 23:06:02,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-12 23:06:02,466 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 65 transitions. [2021-11-12 23:06:02,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-12 23:06:02,471 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:02,472 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:02,509 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:02,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:02,691 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:02,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:02,692 INFO L85 PathProgramCache]: Analyzing trace with hash 1262121361, now seen corresponding path program 1 times [2021-11-12 23:06:02,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:02,693 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914120656] [2021-11-12 23:06:02,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:02,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:02,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:02,852 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-12 23:06:02,853 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:02,853 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914120656] [2021-11-12 23:06:02,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914120656] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:02,858 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [441048985] [2021-11-12 23:06:02,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:02,859 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:02,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:02,873 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:02,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 23:06:02,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:02,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 23:06:02,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:03,188 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-12 23:06:03,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:03,896 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-12 23:06:03,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [441048985] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:03,897 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1452362118] [2021-11-12 23:06:03,911 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:03,911 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:03,912 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:610) 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) [2021-11-12 23:06:03,913 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:03,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 8 [2021-11-12 23:06:03,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53031930] [2021-11-12 23:06:03,913 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:03,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 23:06:03,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:03,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 23:06:03,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:06:03,915 INFO L87 Difference]: Start difference. First operand 40 states and 65 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 2 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-12 23:06:04,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:04,042 INFO L93 Difference]: Finished difference Result 57 states and 112 transitions. [2021-11-12 23:06:04,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:06:04,044 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 2 states have call predecessors, (6), 4 states have call successors, (6) Word has length 44 [2021-11-12 23:06:04,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:04,054 INFO L225 Difference]: With dead ends: 57 [2021-11-12 23:06:04,054 INFO L226 Difference]: Without dead ends: 53 [2021-11-12 23:06:04,055 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:06:04,057 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 28 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 56.36ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.59ms SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 94.09ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:04,057 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 52 Invalid, 74 Unknown, 0 Unchecked, 2.59ms Time], IncrementalHoareTripleChecker [24 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 94.09ms Time] [2021-11-12 23:06:04,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-12 23:06:04,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-11-12 23:06:04,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 35 states have internal predecessors, (38), 10 states have call successors, (10), 2 states have call predecessors, (10), 8 states have return successors, (60), 15 states have call predecessors, (60), 10 states have call successors, (60) [2021-11-12 23:06:04,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 108 transitions. [2021-11-12 23:06:04,105 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 108 transitions. Word has length 44 [2021-11-12 23:06:04,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:04,106 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 108 transitions. [2021-11-12 23:06:04,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 2 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-12 23:06:04,106 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 108 transitions. [2021-11-12 23:06:04,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-12 23:06:04,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:04,126 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 11, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:04,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:04,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:04,347 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:04,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:04,348 INFO L85 PathProgramCache]: Analyzing trace with hash -1462639456, now seen corresponding path program 2 times [2021-11-12 23:06:04,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:04,348 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892297780] [2021-11-12 23:06:04,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:04,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:04,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:04,555 INFO L134 CoverageAnalysis]: Checked inductivity of 669 backedges. 157 proven. 146 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2021-11-12 23:06:04,555 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:04,556 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892297780] [2021-11-12 23:06:04,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892297780] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:04,556 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885877822] [2021-11-12 23:06:04,556 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:06:04,556 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:04,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:04,562 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:04,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 23:06:04,650 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-12 23:06:04,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:06:04,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 23:06:04,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:04,934 INFO L134 CoverageAnalysis]: Checked inductivity of 669 backedges. 196 proven. 31 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-11-12 23:06:04,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:05,747 INFO L134 CoverageAnalysis]: Checked inductivity of 669 backedges. 196 proven. 43 refuted. 0 times theorem prover too weak. 430 trivial. 0 not checked. [2021-11-12 23:06:05,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885877822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:05,748 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1148889065] [2021-11-12 23:06:05,751 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:05,751 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:05,752 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:610) 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) [2021-11-12 23:06:05,753 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:05,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 12 [2021-11-12 23:06:05,754 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663103210] [2021-11-12 23:06:05,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:05,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 23:06:05,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:05,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 23:06:05,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2021-11-12 23:06:05,756 INFO L87 Difference]: Start difference. First operand 53 states and 108 transitions. Second operand has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 12 states have internal predecessors, (44), 7 states have call successors, (14), 1 states have call predecessors, (14), 5 states have return successors, (18), 8 states have call predecessors, (18), 7 states have call successors, (18) [2021-11-12 23:06:05,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:05,940 INFO L93 Difference]: Finished difference Result 124 states and 494 transitions. [2021-11-12 23:06:05,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 23:06:05,941 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 12 states have internal predecessors, (44), 7 states have call successors, (14), 1 states have call predecessors, (14), 5 states have return successors, (18), 8 states have call predecessors, (18), 7 states have call successors, (18) Word has length 118 [2021-11-12 23:06:05,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:05,945 INFO L225 Difference]: With dead ends: 124 [2021-11-12 23:06:05,945 INFO L226 Difference]: Without dead ends: 47 [2021-11-12 23:06:05,952 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 238 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2021-11-12 23:06:05,953 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 18 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 91.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.66ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 117.86ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:05,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 90 Invalid, 137 Unknown, 0 Unchecked, 8.66ms Time], IncrementalHoareTripleChecker [21 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 117.86ms Time] [2021-11-12 23:06:05,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-12 23:06:05,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-12 23:06:05,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 33 states have internal predecessors, (34), 8 states have call successors, (8), 2 states have call predecessors, (8), 8 states have return successors, (20), 11 states have call predecessors, (20), 8 states have call successors, (20) [2021-11-12 23:06:05,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 62 transitions. [2021-11-12 23:06:05,968 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 62 transitions. Word has length 118 [2021-11-12 23:06:05,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:05,969 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 62 transitions. [2021-11-12 23:06:05,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 12 states have internal predecessors, (44), 7 states have call successors, (14), 1 states have call predecessors, (14), 5 states have return successors, (18), 8 states have call predecessors, (18), 7 states have call successors, (18) [2021-11-12 23:06:05,969 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 62 transitions. [2021-11-12 23:06:05,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-12 23:06:05,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:05,973 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:06,008 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-12 23:06:06,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:06,200 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:06,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:06,201 INFO L85 PathProgramCache]: Analyzing trace with hash -1396423690, now seen corresponding path program 3 times [2021-11-12 23:06:06,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:06,201 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [197227492] [2021-11-12 23:06:06,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:06,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:06,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:06,359 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 104 proven. 14 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-12 23:06:06,360 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:06,360 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [197227492] [2021-11-12 23:06:06,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [197227492] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:06,360 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475092289] [2021-11-12 23:06:06,361 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 23:06:06,361 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:06,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:06,372 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:06,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 23:06:06,455 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 23:06:06,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:06:06,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 23:06:06,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:06,618 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 98 proven. 19 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-11-12 23:06:06,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:07,281 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 105 proven. 13 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-12 23:06:07,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475092289] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:07,281 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [801617202] [2021-11-12 23:06:07,284 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:07,284 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:07,284 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:610) 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) [2021-11-12 23:06:07,285 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:07,285 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 10] total 18 [2021-11-12 23:06:07,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580640854] [2021-11-12 23:06:07,286 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:07,286 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-12 23:06:07,286 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:07,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-12 23:06:07,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-11-12 23:06:07,288 INFO L87 Difference]: Start difference. First operand 47 states and 62 transitions. Second operand has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 14 states have internal predecessors, (41), 4 states have call successors, (7), 1 states have call predecessors, (7), 8 states have return successors, (14), 9 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-12 23:06:07,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:07,740 INFO L93 Difference]: Finished difference Result 106 states and 156 transitions. [2021-11-12 23:06:07,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-12 23:06:07,746 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 14 states have internal predecessors, (41), 4 states have call successors, (7), 1 states have call predecessors, (7), 8 states have return successors, (14), 9 states have call predecessors, (14), 4 states have call successors, (14) Word has length 78 [2021-11-12 23:06:07,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:07,748 INFO L225 Difference]: With dead ends: 106 [2021-11-12 23:06:07,748 INFO L226 Difference]: Without dead ends: 57 [2021-11-12 23:06:07,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=212, Invalid=718, Unknown=0, NotChecked=0, Total=930 [2021-11-12 23:06:07,751 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 25 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 148.40ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.48ms SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 186.87ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:07,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 99 Invalid, 302 Unknown, 0 Unchecked, 3.48ms Time], IncrementalHoareTripleChecker [67 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 186.87ms Time] [2021-11-12 23:06:07,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-12 23:06:07,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 51. [2021-11-12 23:06:07,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 36 states have internal predecessors, (39), 9 states have call successors, (9), 3 states have call predecessors, (9), 8 states have return successors, (21), 11 states have call predecessors, (21), 9 states have call successors, (21) [2021-11-12 23:06:07,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 69 transitions. [2021-11-12 23:06:07,770 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 69 transitions. Word has length 78 [2021-11-12 23:06:07,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:07,771 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 69 transitions. [2021-11-12 23:06:07,771 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 14 states have internal predecessors, (41), 4 states have call successors, (7), 1 states have call predecessors, (7), 8 states have return successors, (14), 9 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-12 23:06:07,772 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 69 transitions. [2021-11-12 23:06:07,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-12 23:06:07,784 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:07,784 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 9, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:07,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:07,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:07,985 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:07,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:07,985 INFO L85 PathProgramCache]: Analyzing trace with hash 230307708, now seen corresponding path program 4 times [2021-11-12 23:06:07,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:07,986 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561387287] [2021-11-12 23:06:07,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:07,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:08,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:08,247 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 113 proven. 166 refuted. 0 times theorem prover too weak. 229 trivial. 0 not checked. [2021-11-12 23:06:08,247 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:08,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561387287] [2021-11-12 23:06:08,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561387287] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:08,248 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108193638] [2021-11-12 23:06:08,248 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 23:06:08,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:08,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:08,249 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:08,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 23:06:08,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:08,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-12 23:06:08,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:08,612 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 286 proven. 71 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2021-11-12 23:06:08,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:10,221 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 121 proven. 161 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2021-11-12 23:06:10,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108193638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:10,222 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1799882834] [2021-11-12 23:06:10,224 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:10,224 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:10,225 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:610) 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) [2021-11-12 23:06:10,225 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:10,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 16] total 24 [2021-11-12 23:06:10,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477074697] [2021-11-12 23:06:10,226 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:10,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-12 23:06:10,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:10,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-12 23:06:10,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2021-11-12 23:06:10,228 INFO L87 Difference]: Start difference. First operand 51 states and 69 transitions. Second operand has 24 states, 24 states have (on average 2.5) internal successors, (60), 19 states have internal predecessors, (60), 9 states have call successors, (15), 2 states have call predecessors, (15), 11 states have return successors, (25), 12 states have call predecessors, (25), 9 states have call successors, (25) [2021-11-12 23:06:11,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:11,101 INFO L93 Difference]: Finished difference Result 133 states and 185 transitions. [2021-11-12 23:06:11,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-12 23:06:11,104 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.5) internal successors, (60), 19 states have internal predecessors, (60), 9 states have call successors, (15), 2 states have call predecessors, (15), 11 states have return successors, (25), 12 states have call predecessors, (25), 9 states have call successors, (25) Word has length 104 [2021-11-12 23:06:11,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:11,107 INFO L225 Difference]: With dead ends: 133 [2021-11-12 23:06:11,108 INFO L226 Difference]: Without dead ends: 71 [2021-11-12 23:06:11,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 199 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=552, Invalid=1998, Unknown=0, NotChecked=0, Total=2550 [2021-11-12 23:06:11,112 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 48 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 231.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.94ms SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 276.64ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:11,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 141 Invalid, 506 Unknown, 0 Unchecked, 4.94ms Time], IncrementalHoareTripleChecker [135 Valid, 371 Invalid, 0 Unknown, 0 Unchecked, 276.64ms Time] [2021-11-12 23:06:11,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-12 23:06:11,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 60. [2021-11-12 23:06:11,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 42 states have internal predecessors, (46), 11 states have call successors, (11), 4 states have call predecessors, (11), 9 states have return successors, (20), 13 states have call predecessors, (20), 11 states have call successors, (20) [2021-11-12 23:06:11,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 77 transitions. [2021-11-12 23:06:11,125 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 77 transitions. Word has length 104 [2021-11-12 23:06:11,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:11,126 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 77 transitions. [2021-11-12 23:06:11,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.5) internal successors, (60), 19 states have internal predecessors, (60), 9 states have call successors, (15), 2 states have call predecessors, (15), 11 states have return successors, (25), 12 states have call predecessors, (25), 9 states have call successors, (25) [2021-11-12 23:06:11,126 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 77 transitions. [2021-11-12 23:06:11,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-12 23:06:11,131 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:11,131 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 12, 9, 8, 8, 8, 8, 8, 8, 8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:11,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:11,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:11,344 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:11,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:11,345 INFO L85 PathProgramCache]: Analyzing trace with hash -1241634437, now seen corresponding path program 5 times [2021-11-12 23:06:11,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:11,345 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045647135] [2021-11-12 23:06:11,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:11,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:11,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:11,712 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 385 proven. 203 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2021-11-12 23:06:11,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:11,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045647135] [2021-11-12 23:06:11,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045647135] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:11,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721638128] [2021-11-12 23:06:11,713 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:06:11,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:11,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:11,715 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:11,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 23:06:11,870 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-12 23:06:11,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:06:11,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-12 23:06:11,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:12,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 367 proven. 209 refuted. 0 times theorem prover too weak. 454 trivial. 0 not checked. [2021-11-12 23:06:12,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:15,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 410 proven. 201 refuted. 0 times theorem prover too weak. 419 trivial. 0 not checked. [2021-11-12 23:06:15,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721638128] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:15,895 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1165316672] [2021-11-12 23:06:15,900 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:15,900 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:15,900 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:610) 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) [2021-11-12 23:06:15,905 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:15,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19, 26] total 37 [2021-11-12 23:06:15,906 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434254114] [2021-11-12 23:06:15,906 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:15,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-12 23:06:15,909 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:15,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-12 23:06:15,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1165, Unknown=0, NotChecked=0, Total=1332 [2021-11-12 23:06:15,911 INFO L87 Difference]: Start difference. First operand 60 states and 77 transitions. Second operand has 37 states, 37 states have (on average 1.945945945945946) internal successors, (72), 30 states have internal predecessors, (72), 13 states have call successors, (16), 1 states have call predecessors, (16), 17 states have return successors, (30), 18 states have call predecessors, (30), 13 states have call successors, (30) [2021-11-12 23:06:17,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:17,685 INFO L93 Difference]: Finished difference Result 170 states and 226 transitions. [2021-11-12 23:06:17,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-12 23:06:17,686 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.945945945945946) internal successors, (72), 30 states have internal predecessors, (72), 13 states have call successors, (16), 1 states have call predecessors, (16), 17 states have return successors, (30), 18 states have call predecessors, (30), 13 states have call successors, (30) Word has length 143 [2021-11-12 23:06:17,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:17,689 INFO L225 Difference]: With dead ends: 170 [2021-11-12 23:06:17,689 INFO L226 Difference]: Without dead ends: 114 [2021-11-12 23:06:17,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 275 SyntacticMatches, 4 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1880 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1496, Invalid=6160, Unknown=0, NotChecked=0, Total=7656 [2021-11-12 23:06:17,704 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 44 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 862 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 477.32ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 1054 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.05ms SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 862 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 592.42ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:17,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 208 Invalid, 1054 Unknown, 0 Unchecked, 9.05ms Time], IncrementalHoareTripleChecker [192 Valid, 862 Invalid, 0 Unknown, 0 Unchecked, 592.42ms Time] [2021-11-12 23:06:17,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-12 23:06:17,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 70. [2021-11-12 23:06:17,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 48 states have internal predecessors, (52), 13 states have call successors, (13), 4 states have call predecessors, (13), 11 states have return successors, (26), 17 states have call predecessors, (26), 13 states have call successors, (26) [2021-11-12 23:06:17,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2021-11-12 23:06:17,732 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 143 [2021-11-12 23:06:17,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:17,733 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2021-11-12 23:06:17,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.945945945945946) internal successors, (72), 30 states have internal predecessors, (72), 13 states have call successors, (16), 1 states have call predecessors, (16), 17 states have return successors, (30), 18 states have call predecessors, (30), 13 states have call successors, (30) [2021-11-12 23:06:17,734 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2021-11-12 23:06:17,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-12 23:06:17,741 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:17,741 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 12, 9, 8, 8, 8, 8, 8, 8, 8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:17,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:17,958 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:17,958 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:17,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:17,959 INFO L85 PathProgramCache]: Analyzing trace with hash -2132927335, now seen corresponding path program 6 times [2021-11-12 23:06:17,959 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:17,959 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576992536] [2021-11-12 23:06:17,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:17,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:18,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:18,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 154 proven. 358 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2021-11-12 23:06:18,253 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:18,254 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576992536] [2021-11-12 23:06:18,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576992536] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:18,254 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274084816] [2021-11-12 23:06:18,254 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 23:06:18,254 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:18,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:18,256 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:18,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 23:06:18,419 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 23:06:18,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:06:18,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-12 23:06:18,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:18,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 595 proven. 114 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2021-11-12 23:06:18,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:20,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1030 backedges. 160 proven. 360 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2021-11-12 23:06:20,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274084816] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:20,614 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1263360160] [2021-11-12 23:06:20,616 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:20,616 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:20,617 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:610) 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) [2021-11-12 23:06:20,618 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:20,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 17] total 21 [2021-11-12 23:06:20,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953110785] [2021-11-12 23:06:20,619 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:20,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-12 23:06:20,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:20,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-12 23:06:20,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-11-12 23:06:20,621 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand has 21 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 18 states have internal predecessors, (61), 10 states have call successors, (16), 2 states have call predecessors, (16), 11 states have return successors, (25), 10 states have call predecessors, (25), 10 states have call successors, (25) [2021-11-12 23:06:21,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:21,340 INFO L93 Difference]: Finished difference Result 150 states and 199 transitions. [2021-11-12 23:06:21,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-12 23:06:21,341 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 18 states have internal predecessors, (61), 10 states have call successors, (16), 2 states have call predecessors, (16), 11 states have return successors, (25), 10 states have call predecessors, (25), 10 states have call successors, (25) Word has length 143 [2021-11-12 23:06:21,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:21,342 INFO L225 Difference]: With dead ends: 150 [2021-11-12 23:06:21,342 INFO L226 Difference]: Without dead ends: 81 [2021-11-12 23:06:21,344 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 281 SyntacticMatches, 4 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=564, Invalid=1886, Unknown=0, NotChecked=0, Total=2450 [2021-11-12 23:06:21,345 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 39 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 424 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 218.20ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.60ms SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 256.39ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:21,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 150 Invalid, 537 Unknown, 0 Unchecked, 3.60ms Time], IncrementalHoareTripleChecker [113 Valid, 424 Invalid, 0 Unknown, 0 Unchecked, 256.39ms Time] [2021-11-12 23:06:21,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-12 23:06:21,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 70. [2021-11-12 23:06:21,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 48 states have internal predecessors, (52), 13 states have call successors, (13), 4 states have call predecessors, (13), 11 states have return successors, (24), 17 states have call predecessors, (24), 13 states have call successors, (24) [2021-11-12 23:06:21,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2021-11-12 23:06:21,356 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 143 [2021-11-12 23:06:21,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:21,357 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2021-11-12 23:06:21,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 18 states have internal predecessors, (61), 10 states have call successors, (16), 2 states have call predecessors, (16), 11 states have return successors, (25), 10 states have call predecessors, (25), 10 states have call successors, (25) [2021-11-12 23:06:21,359 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2021-11-12 23:06:21,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-12 23:06:21,361 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:21,362 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 13, 10, 9, 9, 9, 9, 9, 9, 9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:21,390 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-12 23:06:21,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:21,580 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:21,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:21,581 INFO L85 PathProgramCache]: Analyzing trace with hash -511219076, now seen corresponding path program 7 times [2021-11-12 23:06:21,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:21,581 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286823691] [2021-11-12 23:06:21,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:21,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:21,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:21,917 INFO L134 CoverageAnalysis]: Checked inductivity of 1246 backedges. 439 proven. 281 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2021-11-12 23:06:21,918 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:21,918 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286823691] [2021-11-12 23:06:21,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1286823691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:21,918 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619406187] [2021-11-12 23:06:21,918 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 23:06:21,918 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:21,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:21,924 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:21,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 23:06:22,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:22,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-12 23:06:22,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:22,498 INFO L134 CoverageAnalysis]: Checked inductivity of 1246 backedges. 421 proven. 286 refuted. 0 times theorem prover too weak. 539 trivial. 0 not checked. [2021-11-12 23:06:22,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:26,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1246 backedges. 467 proven. 286 refuted. 0 times theorem prover too weak. 493 trivial. 0 not checked. [2021-11-12 23:06:26,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1619406187] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:26,079 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [45525575] [2021-11-12 23:06:26,081 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:26,081 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:26,082 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:610) 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) [2021-11-12 23:06:26,083 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:26,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20, 27] total 35 [2021-11-12 23:06:26,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406099153] [2021-11-12 23:06:26,083 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:26,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-12 23:06:26,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:26,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-12 23:06:26,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1038, Unknown=0, NotChecked=0, Total=1190 [2021-11-12 23:06:26,086 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 29 states have internal predecessors, (74), 14 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (32), 17 states have call predecessors, (32), 14 states have call successors, (32) [2021-11-12 23:06:27,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:27,613 INFO L93 Difference]: Finished difference Result 178 states and 236 transitions. [2021-11-12 23:06:27,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-12 23:06:27,614 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 29 states have internal predecessors, (74), 14 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (32), 17 states have call predecessors, (32), 14 states have call successors, (32) Word has length 156 [2021-11-12 23:06:27,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:27,616 INFO L225 Difference]: With dead ends: 178 [2021-11-12 23:06:27,616 INFO L226 Difference]: Without dead ends: 112 [2021-11-12 23:06:27,620 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 304 SyntacticMatches, 5 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1737 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1420, Invalid=5552, Unknown=0, NotChecked=0, Total=6972 [2021-11-12 23:06:27,621 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 105 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 745 mSolverCounterSat, 353 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 474.85ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 1098 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.42ms SdHoareTripleChecker+Time, 353 IncrementalHoareTripleChecker+Valid, 745 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 564.44ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:27,622 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 216 Invalid, 1098 Unknown, 0 Unchecked, 6.42ms Time], IncrementalHoareTripleChecker [353 Valid, 745 Invalid, 0 Unknown, 0 Unchecked, 564.44ms Time] [2021-11-12 23:06:27,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-12 23:06:27,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 75. [2021-11-12 23:06:27,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 48 states have (on average 1.1458333333333333) internal successors, (55), 51 states have internal predecessors, (55), 14 states have call successors, (14), 4 states have call predecessors, (14), 12 states have return successors, (28), 19 states have call predecessors, (28), 14 states have call successors, (28) [2021-11-12 23:06:27,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 97 transitions. [2021-11-12 23:06:27,635 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 97 transitions. Word has length 156 [2021-11-12 23:06:27,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:27,636 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 97 transitions. [2021-11-12 23:06:27,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 29 states have internal predecessors, (74), 14 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (32), 17 states have call predecessors, (32), 14 states have call successors, (32) [2021-11-12 23:06:27,636 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 97 transitions. [2021-11-12 23:06:27,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-11-12 23:06:27,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:27,640 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 15, 12, 11, 11, 11, 11, 11, 11, 11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:27,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:27,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:27,868 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:27,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:27,868 INFO L85 PathProgramCache]: Analyzing trace with hash -2140695240, now seen corresponding path program 8 times [2021-11-12 23:06:27,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:27,868 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986876725] [2021-11-12 23:06:27,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:27,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:27,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:28,430 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 600 proven. 156 refuted. 0 times theorem prover too weak. 985 trivial. 0 not checked. [2021-11-12 23:06:28,431 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:28,431 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986876725] [2021-11-12 23:06:28,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986876725] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:28,431 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914550867] [2021-11-12 23:06:28,431 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:06:28,431 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:28,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:28,442 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:28,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-12 23:06:28,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-12 23:06:28,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:06:28,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-12 23:06:28,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:29,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 583 proven. 158 refuted. 0 times theorem prover too weak. 1000 trivial. 0 not checked. [2021-11-12 23:06:29,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:31,747 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 597 proven. 189 refuted. 0 times theorem prover too weak. 955 trivial. 0 not checked. [2021-11-12 23:06:31,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914550867] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:31,748 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1587046614] [2021-11-12 23:06:31,751 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:31,751 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:31,752 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:610) 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) [2021-11-12 23:06:31,753 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:31,754 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 33] total 36 [2021-11-12 23:06:31,754 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896336302] [2021-11-12 23:06:31,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:31,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-12 23:06:31,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:31,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-12 23:06:31,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1171, Unknown=0, NotChecked=0, Total=1260 [2021-11-12 23:06:31,757 INFO L87 Difference]: Start difference. First operand 75 states and 97 transitions. Second operand has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 29 states have internal predecessors, (55), 6 states have call successors, (9), 1 states have call predecessors, (9), 14 states have return successors, (22), 13 states have call predecessors, (22), 6 states have call successors, (22) [2021-11-12 23:06:37,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:37,889 INFO L93 Difference]: Finished difference Result 242 states and 349 transitions. [2021-11-12 23:06:37,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-12 23:06:37,890 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 29 states have internal predecessors, (55), 6 states have call successors, (9), 1 states have call predecessors, (9), 14 states have return successors, (22), 13 states have call predecessors, (22), 6 states have call successors, (22) Word has length 182 [2021-11-12 23:06:37,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:37,894 INFO L225 Difference]: With dead ends: 242 [2021-11-12 23:06:37,895 INFO L226 Difference]: Without dead ends: 190 [2021-11-12 23:06:37,901 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 354 SyntacticMatches, 9 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2919 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1439, Invalid=10993, Unknown=0, NotChecked=0, Total=12432 [2021-11-12 23:06:37,902 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 202 mSDsluCounter, 465 mSDsCounter, 0 mSdLazyCounter, 4098 mSolverCounterSat, 568 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1807.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 489 SdHoareTripleChecker+Invalid, 4666 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 20.35ms SdHoareTripleChecker+Time, 568 IncrementalHoareTripleChecker+Valid, 4098 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2198.48ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:37,903 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 489 Invalid, 4666 Unknown, 0 Unchecked, 20.35ms Time], IncrementalHoareTripleChecker [568 Valid, 4098 Invalid, 0 Unknown, 0 Unchecked, 2198.48ms Time] [2021-11-12 23:06:37,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-12 23:06:37,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 125. [2021-11-12 23:06:37,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 79 states have (on average 1.1139240506329113) internal successors, (88), 81 states have internal predecessors, (88), 25 states have call successors, (25), 6 states have call predecessors, (25), 20 states have return successors, (63), 37 states have call predecessors, (63), 25 states have call successors, (63) [2021-11-12 23:06:37,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 176 transitions. [2021-11-12 23:06:37,927 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 176 transitions. Word has length 182 [2021-11-12 23:06:37,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:37,927 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 176 transitions. [2021-11-12 23:06:37,928 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 29 states have internal predecessors, (55), 6 states have call successors, (9), 1 states have call predecessors, (9), 14 states have return successors, (22), 13 states have call predecessors, (22), 6 states have call successors, (22) [2021-11-12 23:06:37,928 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 176 transitions. [2021-11-12 23:06:37,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-12 23:06:37,931 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:37,932 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 14, 11, 10, 10, 10, 10, 10, 10, 10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:37,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:38,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:38,160 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:38,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:38,161 INFO L85 PathProgramCache]: Analyzing trace with hash -1922447937, now seen corresponding path program 9 times [2021-11-12 23:06:38,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:38,161 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991179707] [2021-11-12 23:06:38,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:38,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:38,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:38,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 495 proven. 368 refuted. 0 times theorem prover too weak. 620 trivial. 0 not checked. [2021-11-12 23:06:38,576 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:38,576 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991179707] [2021-11-12 23:06:38,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991179707] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:38,577 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130631696] [2021-11-12 23:06:38,577 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 23:06:38,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:38,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:38,579 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:38,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-12 23:06:38,859 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 23:06:38,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:06:38,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-12 23:06:38,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:39,285 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 477 proven. 372 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2021-11-12 23:06:39,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:43,341 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 525 proven. 384 refuted. 0 times theorem prover too weak. 574 trivial. 0 not checked. [2021-11-12 23:06:43,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130631696] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:43,342 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1998891755] [2021-11-12 23:06:43,344 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:43,344 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:43,345 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:610) 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) [2021-11-12 23:06:43,345 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:43,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 28] total 32 [2021-11-12 23:06:43,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891595532] [2021-11-12 23:06:43,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:43,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-12 23:06:43,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:43,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-12 23:06:43,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=854, Unknown=0, NotChecked=0, Total=992 [2021-11-12 23:06:43,348 INFO L87 Difference]: Start difference. First operand 125 states and 176 transitions. Second operand has 32 states, 32 states have (on average 2.34375) internal successors, (75), 28 states have internal predecessors, (75), 15 states have call successors, (18), 1 states have call predecessors, (18), 17 states have return successors, (32), 15 states have call predecessors, (32), 15 states have call successors, (32) [2021-11-12 23:06:45,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:45,004 INFO L93 Difference]: Finished difference Result 288 states and 409 transitions. [2021-11-12 23:06:45,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-12 23:06:45,005 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.34375) internal successors, (75), 28 states have internal predecessors, (75), 15 states have call successors, (18), 1 states have call predecessors, (18), 17 states have return successors, (32), 15 states have call predecessors, (32), 15 states have call successors, (32) Word has length 169 [2021-11-12 23:06:45,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:45,009 INFO L225 Difference]: With dead ends: 288 [2021-11-12 23:06:45,009 INFO L226 Difference]: Without dead ends: 167 [2021-11-12 23:06:45,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 334 SyntacticMatches, 6 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1942 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1535, Invalid=5775, Unknown=0, NotChecked=0, Total=7310 [2021-11-12 23:06:45,016 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 88 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 798 mSolverCounterSat, 423 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 509.39ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 1221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.97ms SdHoareTripleChecker+Time, 423 IncrementalHoareTripleChecker+Valid, 798 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 610.47ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:45,017 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 219 Invalid, 1221 Unknown, 0 Unchecked, 5.97ms Time], IncrementalHoareTripleChecker [423 Valid, 798 Invalid, 0 Unknown, 0 Unchecked, 610.47ms Time] [2021-11-12 23:06:45,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-12 23:06:45,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 122. [2021-11-12 23:06:45,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 77 states have (on average 1.1168831168831168) internal successors, (86), 79 states have internal predecessors, (86), 25 states have call successors, (25), 6 states have call predecessors, (25), 19 states have return successors, (58), 36 states have call predecessors, (58), 25 states have call successors, (58) [2021-11-12 23:06:45,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 169 transitions. [2021-11-12 23:06:45,050 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 169 transitions. Word has length 169 [2021-11-12 23:06:45,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:45,051 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 169 transitions. [2021-11-12 23:06:45,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.34375) internal successors, (75), 28 states have internal predecessors, (75), 15 states have call successors, (18), 1 states have call predecessors, (18), 17 states have return successors, (32), 15 states have call predecessors, (32), 15 states have call successors, (32) [2021-11-12 23:06:45,052 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 169 transitions. [2021-11-12 23:06:45,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-12 23:06:45,057 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:45,057 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 16, 13, 12, 12, 12, 12, 12, 12, 12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:45,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:45,276 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-12 23:06:45,276 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:45,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:45,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1482736643, now seen corresponding path program 10 times [2021-11-12 23:06:45,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:45,277 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240357462] [2021-11-12 23:06:45,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:45,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:45,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:45,641 INFO L134 CoverageAnalysis]: Checked inductivity of 2020 backedges. 665 proven. 517 refuted. 0 times theorem prover too weak. 838 trivial. 0 not checked. [2021-11-12 23:06:45,642 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:45,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240357462] [2021-11-12 23:06:45,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [240357462] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:45,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247968121] [2021-11-12 23:06:45,642 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-12 23:06:45,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:45,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:45,644 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:45,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-12 23:06:45,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:45,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 604 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-12 23:06:45,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:46,467 INFO L134 CoverageAnalysis]: Checked inductivity of 2020 backedges. 647 proven. 519 refuted. 0 times theorem prover too weak. 854 trivial. 0 not checked. [2021-11-12 23:06:46,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:51,078 INFO L134 CoverageAnalysis]: Checked inductivity of 2020 backedges. 685 proven. 580 refuted. 0 times theorem prover too weak. 755 trivial. 0 not checked. [2021-11-12 23:06:51,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247968121] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:51,079 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [446608288] [2021-11-12 23:06:51,081 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:51,081 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:51,081 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:610) 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) [2021-11-12 23:06:51,082 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:51,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 32] total 36 [2021-11-12 23:06:51,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431431455] [2021-11-12 23:06:51,083 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:51,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-12 23:06:51,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:51,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-12 23:06:51,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1079, Unknown=0, NotChecked=0, Total=1260 [2021-11-12 23:06:51,086 INFO L87 Difference]: Start difference. First operand 122 states and 169 transitions. Second operand has 36 states, 36 states have (on average 2.4166666666666665) internal successors, (87), 32 states have internal predecessors, (87), 19 states have call successors, (22), 1 states have call predecessors, (22), 19 states have return successors, (38), 17 states have call predecessors, (38), 19 states have call successors, (38) [2021-11-12 23:06:52,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:52,270 INFO L93 Difference]: Finished difference Result 300 states and 415 transitions. [2021-11-12 23:06:52,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-12 23:06:52,271 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.4166666666666665) internal successors, (87), 32 states have internal predecessors, (87), 19 states have call successors, (22), 1 states have call predecessors, (22), 19 states have return successors, (38), 17 states have call predecessors, (38), 19 states have call successors, (38) Word has length 195 [2021-11-12 23:06:52,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:52,274 INFO L225 Difference]: With dead ends: 300 [2021-11-12 23:06:52,274 INFO L226 Difference]: Without dead ends: 126 [2021-11-12 23:06:52,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 386 SyntacticMatches, 6 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 844 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=765, Invalid=3017, Unknown=0, NotChecked=0, Total=3782 [2021-11-12 23:06:52,283 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 120 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 836 mSolverCounterSat, 357 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 494.87ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 1193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.48ms SdHoareTripleChecker+Time, 357 IncrementalHoareTripleChecker+Valid, 836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 603.16ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:52,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 259 Invalid, 1193 Unknown, 0 Unchecked, 5.48ms Time], IncrementalHoareTripleChecker [357 Valid, 836 Invalid, 0 Unknown, 0 Unchecked, 603.16ms Time] [2021-11-12 23:06:52,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-12 23:06:52,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 90. [2021-11-12 23:06:52,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 59 states have (on average 1.11864406779661) internal successors, (66), 60 states have internal predecessors, (66), 16 states have call successors, (16), 6 states have call predecessors, (16), 14 states have return successors, (39), 23 states have call predecessors, (39), 16 states have call successors, (39) [2021-11-12 23:06:52,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 121 transitions. [2021-11-12 23:06:52,303 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 121 transitions. Word has length 195 [2021-11-12 23:06:52,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:52,306 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 121 transitions. [2021-11-12 23:06:52,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.4166666666666665) internal successors, (87), 32 states have internal predecessors, (87), 19 states have call successors, (22), 1 states have call predecessors, (22), 19 states have return successors, (38), 17 states have call predecessors, (38), 19 states have call successors, (38) [2021-11-12 23:06:52,307 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 121 transitions. [2021-11-12 23:06:52,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2021-11-12 23:06:52,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:52,312 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 17, 14, 13, 13, 13, 13, 13, 13, 13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:52,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:52,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:52,528 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:52,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:52,529 INFO L85 PathProgramCache]: Analyzing trace with hash -599600630, now seen corresponding path program 11 times [2021-11-12 23:06:52,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:52,529 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744600673] [2021-11-12 23:06:52,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:52,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:52,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:52,789 INFO L134 CoverageAnalysis]: Checked inductivity of 2320 backedges. 268 proven. 783 refuted. 0 times theorem prover too weak. 1269 trivial. 0 not checked. [2021-11-12 23:06:52,789 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:52,790 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744600673] [2021-11-12 23:06:52,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744600673] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:52,790 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [971233817] [2021-11-12 23:06:52,790 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:06:52,790 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:52,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:52,792 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:52,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-12 23:06:53,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-12 23:06:53,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:06:53,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-12 23:06:53,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:53,707 INFO L134 CoverageAnalysis]: Checked inductivity of 2320 backedges. 1340 proven. 196 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2021-11-12 23:06:53,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:55,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2320 backedges. 274 proven. 806 refuted. 0 times theorem prover too weak. 1240 trivial. 0 not checked. [2021-11-12 23:06:55,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [971233817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:55,809 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2011436706] [2021-11-12 23:06:55,811 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:55,811 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:55,811 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:610) 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) [2021-11-12 23:06:55,812 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:55,813 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 21] total 25 [2021-11-12 23:06:55,813 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800506442] [2021-11-12 23:06:55,813 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:55,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-12 23:06:55,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:55,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-12 23:06:55,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=501, Unknown=0, NotChecked=0, Total=600 [2021-11-12 23:06:55,815 INFO L87 Difference]: Start difference. First operand 90 states and 121 transitions. Second operand has 25 states, 25 states have (on average 2.92) internal successors, (73), 22 states have internal predecessors, (73), 14 states have call successors, (20), 2 states have call predecessors, (20), 13 states have return successors, (31), 12 states have call predecessors, (31), 14 states have call successors, (31) [2021-11-12 23:06:56,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:56,305 INFO L93 Difference]: Finished difference Result 182 states and 248 transitions. [2021-11-12 23:06:56,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-12 23:06:56,306 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 22 states have internal predecessors, (73), 14 states have call successors, (20), 2 states have call predecessors, (20), 13 states have return successors, (31), 12 states have call predecessors, (31), 14 states have call successors, (31) Word has length 208 [2021-11-12 23:06:56,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:56,308 INFO L225 Difference]: With dead ends: 182 [2021-11-12 23:06:56,308 INFO L226 Difference]: Without dead ends: 96 [2021-11-12 23:06:56,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 411 SyntacticMatches, 4 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=395, Invalid=1411, Unknown=0, NotChecked=0, Total=1806 [2021-11-12 23:06:56,311 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 108 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 419 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 176.95ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.09ms SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 219.06ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:56,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 204 Invalid, 549 Unknown, 0 Unchecked, 2.09ms Time], IncrementalHoareTripleChecker [130 Valid, 419 Invalid, 0 Unknown, 0 Unchecked, 219.06ms Time] [2021-11-12 23:06:56,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-12 23:06:56,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 85. [2021-11-12 23:06:56,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 56 states have (on average 1.125) internal successors, (63), 57 states have internal predecessors, (63), 15 states have call successors, (15), 6 states have call predecessors, (15), 13 states have return successors, (30), 21 states have call predecessors, (30), 15 states have call successors, (30) [2021-11-12 23:06:56,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 108 transitions. [2021-11-12 23:06:56,322 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 108 transitions. Word has length 208 [2021-11-12 23:06:56,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:56,323 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 108 transitions. [2021-11-12 23:06:56,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 22 states have internal predecessors, (73), 14 states have call successors, (20), 2 states have call predecessors, (20), 13 states have return successors, (31), 12 states have call predecessors, (31), 14 states have call successors, (31) [2021-11-12 23:06:56,324 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 108 transitions. [2021-11-12 23:06:56,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 281 [2021-11-12 23:06:56,329 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:06:56,330 INFO L514 BasicCegarLoop]: trace histogram [42, 42, 23, 19, 18, 18, 18, 18, 18, 18, 18, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:06:56,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:56,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:56,556 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:06:56,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:06:56,557 INFO L85 PathProgramCache]: Analyzing trace with hash 1205881647, now seen corresponding path program 12 times [2021-11-12 23:06:56,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:06:56,557 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509844709] [2021-11-12 23:06:56,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:06:56,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:06:56,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:06:56,676 INFO L134 CoverageAnalysis]: Checked inductivity of 4329 backedges. 234 proven. 507 refuted. 0 times theorem prover too weak. 3588 trivial. 0 not checked. [2021-11-12 23:06:56,677 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:06:56,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509844709] [2021-11-12 23:06:56,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [509844709] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:06:56,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1730602204] [2021-11-12 23:06:56,678 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 23:06:56,678 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:06:56,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:06:56,679 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:06:56,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-12 23:06:57,050 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 23:06:57,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:06:57,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 681 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 23:06:57,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:06:57,443 INFO L134 CoverageAnalysis]: Checked inductivity of 4329 backedges. 234 proven. 507 refuted. 0 times theorem prover too weak. 3588 trivial. 0 not checked. [2021-11-12 23:06:57,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:06:58,612 INFO L134 CoverageAnalysis]: Checked inductivity of 4329 backedges. 234 proven. 522 refuted. 0 times theorem prover too weak. 3573 trivial. 0 not checked. [2021-11-12 23:06:58,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1730602204] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:06:58,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [321852450] [2021-11-12 23:06:58,614 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-12 23:06:58,614 INFO L166 IcfgInterpreter]: Building call graph [2021-11-12 23:06:58,615 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:610) 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) [2021-11-12 23:06:58,616 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:06:58,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 12 [2021-11-12 23:06:58,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159762696] [2021-11-12 23:06:58,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-12 23:06:58,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 23:06:58,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:06:58,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 23:06:58,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2021-11-12 23:06:58,619 INFO L87 Difference]: Start difference. First operand 85 states and 108 transitions. Second operand has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 9 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (14), 6 states have call predecessors, (14), 9 states have call successors, (14) [2021-11-12 23:06:58,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:06:58,758 INFO L93 Difference]: Finished difference Result 88 states and 111 transitions. [2021-11-12 23:06:58,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 23:06:58,759 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 9 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (14), 6 states have call predecessors, (14), 9 states have call successors, (14) Word has length 280 [2021-11-12 23:06:58,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:06:58,761 INFO L225 Difference]: With dead ends: 88 [2021-11-12 23:06:58,761 INFO L226 Difference]: Without dead ends: 0 [2021-11-12 23:06:58,762 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 573 GetRequests, 558 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2021-11-12 23:06:58,763 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 13 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 89.17ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.12ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 103.08ms IncrementalHoareTripleChecker+Time [2021-11-12 23:06:58,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 80 Invalid, 148 Unknown, 0 Unchecked, 1.12ms Time], IncrementalHoareTripleChecker [11 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 103.08ms Time] [2021-11-12 23:06:58,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-12 23:06:58,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-12 23:06:58,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:06:58,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-12 23:06:58,766 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 280 [2021-11-12 23:06:58,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:06:58,767 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-12 23:06:58,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 9 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (14), 6 states have call predecessors, (14), 9 states have call successors, (14) [2021-11-12 23:06:58,767 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-12 23:06:58,768 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-12 23:06:58,772 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-12 23:06:58,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-12 23:06:59,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-12 23:06:59,002 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-11-12 23:07:16,322 WARN L227 SmtUtils]: Spent 5.55s on a formula simplification. DAG size of input: 208 DAG size of output: 197 (called from [L 182] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.or) [2021-11-12 23:08:01,186 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-11-12 23:08:01,186 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-11-12 23:08:01,186 INFO L858 garLoopResultBuilder]: For program point L29(lines 29 33) no Hoare annotation was computed. [2021-11-12 23:08:01,186 INFO L861 garLoopResultBuilder]: At program point L27(lines 27 47) the Hoare annotation is: true [2021-11-12 23:08:01,186 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 45) no Hoare annotation was computed. [2021-11-12 23:08:01,186 INFO L858 garLoopResultBuilder]: For program point L45(line 45) no Hoare annotation was computed. [2021-11-12 23:08:01,187 INFO L858 garLoopResultBuilder]: For program point L42(lines 42 46) no Hoare annotation was computed. [2021-11-12 23:08:01,187 INFO L861 garLoopResultBuilder]: At program point L41(line 41) the Hoare annotation is: true [2021-11-12 23:08:01,187 INFO L858 garLoopResultBuilder]: For program point L41-1(line 41) no Hoare annotation was computed. [2021-11-12 23:08:01,187 INFO L858 garLoopResultBuilder]: For program point L35(lines 35 40) no Hoare annotation was computed. [2021-11-12 23:08:01,187 INFO L858 garLoopResultBuilder]: For program point ackermannEXIT(lines 16 24) no Hoare annotation was computed. [2021-11-12 23:08:01,187 INFO L854 garLoopResultBuilder]: At program point L23(line 23) the Hoare annotation is: (and (<= |ackermann_#in~n| ackermann_~n) (<= ackermann_~m |ackermann_#in~m|) (<= |ackermann_#in~m| ackermann_~m) (or (not (<= |ackermann_#in~n| 0)) (not (<= 0 |ackermann_#in~n|))) (<= ackermann_~n |ackermann_#in~n|)) [2021-11-12 23:08:01,188 INFO L858 garLoopResultBuilder]: For program point L23-1(line 23) no Hoare annotation was computed. [2021-11-12 23:08:01,188 INFO L861 garLoopResultBuilder]: At program point ackermannENTRY(lines 16 24) the Hoare annotation is: true [2021-11-12 23:08:01,188 INFO L854 garLoopResultBuilder]: At program point L21(line 21) the Hoare annotation is: (and (<= 0 |ackermann_#in~n|) (<= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|) (<= |ackermann_#in~m| ackermann_~m) (<= |ackermann_#in~n| 0)) [2021-11-12 23:08:01,188 INFO L854 garLoopResultBuilder]: At program point L23-2(line 23) the Hoare annotation is: (let ((.cse1 (<= |ackermann_#in~n| ackermann_~n)) (.cse2 (<= ackermann_~m |ackermann_#in~m|)) (.cse4 (<= |ackermann_#in~m| ackermann_~m))) (let ((.cse0 (and .cse1 .cse2 (<= 0 |ackermann_#in~m|) .cse4 (<= |ackermann_#in~m| 0))) (.cse3 (<= 1 |ackermann_#in~m|))) (and (or .cse0 (and .cse1 .cse2 .cse3 .cse4)) (let ((.cse7 (<= 2 |ackermann_#in~n|)) (.cse5 (<= |ackermann_#t~ret8| 3)) (.cse12 (<= |ackermann_#t~ret8| 5)) (.cse11 (<= 2 |ackermann_#in~m|)) (.cse16 (<= 3 |ackermann_#in~n|)) (.cse13 (<= ackermann_~n |ackermann_#in~n|)) (.cse10 (<= 5 |ackermann_#t~ret8|)) (.cse15 (<= 4 |ackermann_#t~ret8|)) (.cse6 (<= 3 |ackermann_#t~ret8|)) (.cse14 (<= 1 |ackermann_#in~n|)) (.cse8 (or (= ackermann_~n 1) (= ackermann_~n |ackermann_#in~n|))) (.cse9 (<= |ackermann_#in~m| 1))) (or (and .cse5 .cse6 (<= |ackermann_#in~n| 2) .cse7 .cse3 .cse8 .cse9) (and .cse10 .cse11 .cse12 .cse7 .cse13) (and .cse5 .cse11 .cse6 .cse14 .cse8 (<= |ackermann_#in~n| 1)) (and .cse10 .cse15 .cse6 .cse12 (<= 4 |ackermann_#in~n|) .cse3 (<= |ackermann_#in~n| 4) .cse8 .cse9) .cse0 (and .cse10 .cse11 .cse16 .cse13) (<= 3 |ackermann_#in~m|) (and (<= |ackermann_#t~ret8| 4) (<= |ackermann_#in~n| 3) .cse15 .cse6 .cse16 .cse3 .cse8 .cse9) (and (<= 6 |ackermann_#t~ret8|) (<= |ackermann_#t~ret8| 6) (<= 5 |ackermann_#in~n|) .cse13) (and .cse10 .cse15 .cse6 .cse3 .cse8 .cse9 (<= 6 |ackermann_#in~n|)) (and (< |ackermann_#in~n| 2) (<= 2 |ackermann_#t~ret8|) (<= |ackermann_#t~ret8| 2) .cse14 .cse8 .cse9)))))) [2021-11-12 23:08:01,188 INFO L858 garLoopResultBuilder]: For program point L20(lines 20 22) no Hoare annotation was computed. [2021-11-12 23:08:01,188 INFO L858 garLoopResultBuilder]: For program point L21-1(line 21) no Hoare annotation was computed. [2021-11-12 23:08:01,189 INFO L858 garLoopResultBuilder]: For program point L23-3(line 23) no Hoare annotation was computed. [2021-11-12 23:08:01,189 INFO L858 garLoopResultBuilder]: For program point L17(lines 17 19) no Hoare annotation was computed. [2021-11-12 23:08:01,189 INFO L858 garLoopResultBuilder]: For program point ackermannFINAL(lines 16 24) no Hoare annotation was computed. [2021-11-12 23:08:01,192 INFO L732 BasicCegarLoop]: Path program histogram: [12, 1, 1] [2021-11-12 23:08:01,193 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-12 23:08:01,205 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.11 11:08:01 BoogieIcfgContainer [2021-11-12 23:08:01,205 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-12 23:08:01,206 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-12 23:08:01,206 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-12 23:08:01,206 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-12 23:08:01,206 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:06:00" (3/4) ... [2021-11-12 23:08:01,209 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-12 23:08:01,215 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ackermann [2021-11-12 23:08:01,219 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 12 nodes and edges [2021-11-12 23:08:01,219 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2021-11-12 23:08:01,219 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2021-11-12 23:08:01,220 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-12 23:08:01,253 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/witness.graphml [2021-11-12 23:08:01,254 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-12 23:08:01,254 INFO L158 Benchmark]: Toolchain (without parser) took 120947.49ms. Allocated memory was 109.1MB in the beginning and 643.8MB in the end (delta: 534.8MB). Free memory was 67.8MB in the beginning and 605.3MB in the end (delta: -537.5MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 23:08:01,254 INFO L158 Benchmark]: CDTParser took 0.34ms. Allocated memory is still 109.1MB. Free memory is still 83.8MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 23:08:01,255 INFO L158 Benchmark]: CACSL2BoogieTranslator took 245.57ms. Allocated memory is still 109.1MB. Free memory was 67.6MB in the beginning and 84.4MB in the end (delta: -16.8MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-12 23:08:01,255 INFO L158 Benchmark]: Boogie Procedure Inliner took 32.24ms. Allocated memory is still 109.1MB. Free memory was 84.0MB in the beginning and 82.8MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-12 23:08:01,256 INFO L158 Benchmark]: Boogie Preprocessor took 18.91ms. Allocated memory is still 109.1MB. Free memory was 82.8MB in the beginning and 82.0MB in the end (delta: 877.7kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 23:08:01,256 INFO L158 Benchmark]: RCFGBuilder took 302.92ms. Allocated memory is still 109.1MB. Free memory was 82.0MB in the beginning and 71.5MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-12 23:08:01,256 INFO L158 Benchmark]: TraceAbstraction took 120288.66ms. Allocated memory was 109.1MB in the beginning and 643.8MB in the end (delta: 534.8MB). Free memory was 71.1MB in the beginning and 607.4MB in the end (delta: -536.3MB). Peak memory consumption was 393.8MB. Max. memory is 16.1GB. [2021-11-12 23:08:01,257 INFO L158 Benchmark]: Witness Printer took 48.07ms. Allocated memory is still 643.8MB. Free memory was 607.4MB in the beginning and 605.3MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-12 23:08:01,259 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34ms. Allocated memory is still 109.1MB. Free memory is still 83.8MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 245.57ms. Allocated memory is still 109.1MB. Free memory was 67.6MB in the beginning and 84.4MB in the end (delta: -16.8MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 32.24ms. Allocated memory is still 109.1MB. Free memory was 84.0MB in the beginning and 82.8MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 18.91ms. Allocated memory is still 109.1MB. Free memory was 82.8MB in the beginning and 82.0MB in the end (delta: 877.7kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 302.92ms. Allocated memory is still 109.1MB. Free memory was 82.0MB in the beginning and 71.5MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 120288.66ms. Allocated memory was 109.1MB in the beginning and 643.8MB in the end (delta: 534.8MB). Free memory was 71.1MB in the beginning and 607.4MB in the end (delta: -536.3MB). Peak memory consumption was 393.8MB. Max. memory is 16.1GB. * Witness Printer took 48.07ms. Allocated memory is still 643.8MB. Free memory was 607.4MB in the beginning and 605.3MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 45]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 120.2s, OverallIterations: 14, TraceHistogramMax: 42, PathProgramHistogramMax: 12, EmptinessCheckTime: 0.1s, AutomataDifference: 15.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 62.2s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 899 SdHoareTripleChecker+Valid, 6054.61ms IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 874 mSDsluCounter, 2309 SdHoareTripleChecker+Invalid, 4962.00ms Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 2108 mSDsCounter, 2413 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 9214 IncrementalHoareTripleChecker+Invalid, 11627 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 2413 mSolverCounterUnsat, 366 mSDtfsCounter, 9214 mSolverCounterSat, 83.85ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 4299 GetRequests, 3618 SyntacticMatches, 44 SemanticMatches, 637 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10873 ImplicationChecksByTransitivity, 12.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=125occurred in iteration=10, InterpolantAutomatonStates: 420, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 14 MinimizatonAttempts, 266 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 6 LocationsWithAnnotation, 722 PreInvPairs, 5456 NumberOfFragments, 293 HoareAnnotationTreeSize, 722 FomulaSimplifications, 373139 FormulaSimplificationTreeSizeReduction, 59.4s HoareSimplificationTime, 6 FomulaSimplificationsInter, 1614890 FormulaSimplificationTreeSizeReductionInter, 2.8s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 1.5s SatisfiabilityAnalysisTime, 35.0s InterpolantComputationTime, 3687 NumberOfCodeBlocks, 3489 NumberOfCodeBlocksAsserted, 80 NumberOfCheckSat, 5485 ConstructedInterpolants, 0 QuantifiedInterpolants, 10835 SizeOfPredicates, 93 NumberOfNonLiveVariables, 5205 ConjunctsInSsa, 335 ConjunctsInUnsatCore, 40 InterpolantComputations, 1 PerfectInterpolantSequences, 40532/50136 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 27]: Loop Invariant Derived loop invariant: 1 RESULT: Ultimate proved your program to be correct! [2021-11-12 23:08:01,298 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fdcbc658-d4f9-483e-83e5-05f4d7ed5df2/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE