./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/Addition03-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Addition03-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P --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 2b4726bd085117d6d28f7ec87f442bbec9d0d87c17bc39b8147695c8c5a6ec7b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:19:52,942 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:19:52,945 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:19:52,998 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:19:52,999 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:19:53,004 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:19:53,007 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:19:53,011 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:19:53,013 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:19:53,019 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:19:53,020 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:19:53,022 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:19:53,022 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:19:53,025 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:19:53,027 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:19:53,029 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:19:53,031 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:19:53,032 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:19:53,034 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:19:53,036 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:19:53,038 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:19:53,040 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:19:53,041 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:19:53,042 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:19:53,046 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:19:53,047 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:19:53,047 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:19:53,048 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:19:53,049 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:19:53,050 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:19:53,050 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:19:53,051 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:19:53,052 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:19:53,053 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:19:53,054 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:19:53,055 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:19:53,055 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:19:53,056 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:19:53,056 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:19:53,057 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:19:53,058 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:19:53,059 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:19:53,083 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:19:53,084 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:19:53,084 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:19:53,084 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:19:53,085 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:19:53,085 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:19:53,085 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:19:53,086 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:19:53,086 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:19:53,086 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:19:53,086 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:19:53,087 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:19:53,087 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:19:53,087 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:19:53,087 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:19:53,087 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:19:53,088 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:19:53,088 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:19:53,089 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:19:53,089 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:19:53,089 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:19:53,089 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:19:53,090 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:19:53,090 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:19:53,090 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:19:53,090 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:19:53,090 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:19:53,091 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:19:53,091 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:19:53,093 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:19:53,093 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:19:53,093 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:19:53,094 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:19:53,094 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:19:53,094 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:19:53,094 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:19:53,095 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:19:53,096 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:19:53,096 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:19:53,096 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:19:53,096 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:19:53,097 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_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2b4726bd085117d6d28f7ec87f442bbec9d0d87c17bc39b8147695c8c5a6ec7b [2021-11-20 23:19:53,434 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:19:53,468 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:19:53,470 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:19:53,471 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:19:53,472 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:19:53,474 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/recursive/Addition03-1.c [2021-11-20 23:19:53,546 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/data/78be19672/23f85c6521b64772bea8d91d55c195e6/FLAG8a57c3de8 [2021-11-20 23:19:54,088 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:19:54,089 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/sv-benchmarks/c/recursive/Addition03-1.c [2021-11-20 23:19:54,101 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/data/78be19672/23f85c6521b64772bea8d91d55c195e6/FLAG8a57c3de8 [2021-11-20 23:19:54,447 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/data/78be19672/23f85c6521b64772bea8d91d55c195e6 [2021-11-20 23:19:54,451 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:19:54,453 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:19:54,455 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:19:54,456 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:19:54,459 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:19:54,460 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,461 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71ea410f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54, skipping insertion in model container [2021-11-20 23:19:54,461 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,468 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:19:54,481 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:19:54,688 WARN L230 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_543997de-ce06-46bd-8c70-ed68c50afdae/sv-benchmarks/c/recursive/Addition03-1.c[840,853] [2021-11-20 23:19:54,691 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:19:54,702 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:19:54,726 WARN L230 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_543997de-ce06-46bd-8c70-ed68c50afdae/sv-benchmarks/c/recursive/Addition03-1.c[840,853] [2021-11-20 23:19:54,727 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:19:54,745 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:19:54,745 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54 WrapperNode [2021-11-20 23:19:54,746 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:19:54,747 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:19:54,747 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:19:54,748 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:19:54,755 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,762 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,783 INFO L137 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 26 [2021-11-20 23:19:54,784 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:19:54,785 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:19:54,786 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:19:54,786 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:19:54,797 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,798 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,812 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,813 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,816 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,824 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,828 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,830 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:19:54,832 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:19:54,833 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:19:54,833 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:19:54,834 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54" (1/1) ... [2021-11-20 23:19:54,844 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:19:54,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:54,881 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:19:54,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:19:54,940 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:19:54,941 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:19:54,941 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:19:54,941 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:19:54,941 INFO L130 BoogieDeclarations]: Found specification of procedure addition [2021-11-20 23:19:54,942 INFO L138 BoogieDeclarations]: Found implementation of procedure addition [2021-11-20 23:19:55,025 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:19:55,028 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:19:55,218 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:19:55,238 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:19:55,238 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-20 23:19:55,241 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:19:55 BoogieIcfgContainer [2021-11-20 23:19:55,242 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:19:55,246 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:19:55,247 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:19:55,251 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:19:55,251 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:19:54" (1/3) ... [2021-11-20 23:19:55,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a9efbae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:19:55, skipping insertion in model container [2021-11-20 23:19:55,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:54" (2/3) ... [2021-11-20 23:19:55,254 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a9efbae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:19:55, skipping insertion in model container [2021-11-20 23:19:55,254 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:19:55" (3/3) ... [2021-11-20 23:19:55,256 INFO L111 eAbstractionObserver]: Analyzing ICFG Addition03-1.c [2021-11-20 23:19:55,263 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:19:55,263 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:19:55,341 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:19:55,354 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 [2021-11-20 23:19:55,355 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:19:55,383 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:19:55,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:19:55,405 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:55,406 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:55,407 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:55,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:55,415 INFO L85 PathProgramCache]: Analyzing trace with hash 1536395142, now seen corresponding path program 1 times [2021-11-20 23:19:55,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:55,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134750484] [2021-11-20 23:19:55,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:55,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:55,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:55,748 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:55,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:55,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134750484] [2021-11-20 23:19:55,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134750484] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:55,751 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:55,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:19:55,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476298785] [2021-11-20 23:19:55,764 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:55,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:19:55,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:55,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:19:55,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:19:55,844 INFO L87 Difference]: Start difference. First operand has 18 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 23:19:55,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:55,966 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2021-11-20 23:19:55,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:19:55,981 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-11-20 23:19:55,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:55,993 INFO L225 Difference]: With dead ends: 28 [2021-11-20 23:19:55,993 INFO L226 Difference]: Without dead ends: 18 [2021-11-20 23:19:55,998 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 [2021-11-20 23:19:56,009 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 15 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:56,012 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 25 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:56,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-20 23:19:56,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-20 23:19:56,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-20 23:19:56,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 23 transitions. [2021-11-20 23:19:56,068 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 23 transitions. Word has length 9 [2021-11-20 23:19:56,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:56,069 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 23 transitions. [2021-11-20 23:19:56,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 23:19:56,071 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 23 transitions. [2021-11-20 23:19:56,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:19:56,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:56,076 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:56,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:19:56,078 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:56,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:56,082 INFO L85 PathProgramCache]: Analyzing trace with hash 1532203166, now seen corresponding path program 1 times [2021-11-20 23:19:56,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:56,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395606247] [2021-11-20 23:19:56,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:56,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:56,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:56,259 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:19:56,259 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:56,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395606247] [2021-11-20 23:19:56,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395606247] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:56,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785128321] [2021-11-20 23:19:56,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:56,273 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:56,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:56,275 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:56,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:19:56,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:56,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 23:19:56,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:56,506 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:19:56,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:56,804 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:19:56,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785128321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:56,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2142831418] [2021-11-20 23:19:56,844 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:56,844 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:56,851 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) [2021-11-20 23:19:56,862 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:56,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 10 [2021-11-20 23:19:56,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403546650] [2021-11-20 23:19:56,865 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:56,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-20 23:19:56,869 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:56,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-20 23:19:56,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:19:56,871 INFO L87 Difference]: Start difference. First operand 18 states and 23 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 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) [2021-11-20 23:19:57,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:57,070 INFO L93 Difference]: Finished difference Result 30 states and 38 transitions. [2021-11-20 23:19:57,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:19:57,071 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 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 16 [2021-11-20 23:19:57,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:57,082 INFO L225 Difference]: With dead ends: 30 [2021-11-20 23:19:57,082 INFO L226 Difference]: Without dead ends: 24 [2021-11-20 23:19:57,083 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2021-11-20 23:19:57,085 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 41 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:57,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 36 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:57,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-20 23:19:57,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-20 23:19:57,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 4 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-20 23:19:57,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 31 transitions. [2021-11-20 23:19:57,105 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 31 transitions. Word has length 16 [2021-11-20 23:19:57,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:57,106 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 31 transitions. [2021-11-20 23:19:57,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 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) [2021-11-20 23:19:57,106 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 31 transitions. [2021-11-20 23:19:57,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 23:19:57,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:57,110 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:57,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:57,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:57,332 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:57,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:57,333 INFO L85 PathProgramCache]: Analyzing trace with hash 889673888, now seen corresponding path program 2 times [2021-11-20 23:19:57,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:57,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630599272] [2021-11-20 23:19:57,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:57,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:57,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:57,462 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-20 23:19:57,462 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:57,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630599272] [2021-11-20 23:19:57,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630599272] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:57,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1573387598] [2021-11-20 23:19:57,467 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:19:57,467 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:57,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:57,469 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:57,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:19:57,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:19:57,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:57,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 23:19:57,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:57,702 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-20 23:19:57,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:58,447 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:19:58,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1573387598] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:58,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [440848127] [2021-11-20 23:19:58,452 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:58,452 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:58,453 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) [2021-11-20 23:19:58,454 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:58,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 14 [2021-11-20 23:19:58,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671663038] [2021-11-20 23:19:58,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:58,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:19:58,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:58,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:19:58,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-20 23:19:58,458 INFO L87 Difference]: Start difference. First operand 24 states and 31 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 5 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-20 23:19:58,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:58,625 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-20 23:19:58,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 23:19:58,626 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 5 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) Word has length 30 [2021-11-20 23:19:58,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:58,629 INFO L225 Difference]: With dead ends: 36 [2021-11-20 23:19:58,629 INFO L226 Difference]: Without dead ends: 30 [2021-11-20 23:19:58,630 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=111, Invalid=231, Unknown=0, NotChecked=0, Total=342 [2021-11-20 23:19:58,632 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 40 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:58,632 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 49 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:58,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-20 23:19:58,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-20 23:19:58,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 6 states have return successors, (13), 7 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-20 23:19:58,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2021-11-20 23:19:58,643 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 30 [2021-11-20 23:19:58,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:58,644 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2021-11-20 23:19:58,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 5 states have call successors, (5), 1 states have call predecessors, (5), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-20 23:19:58,644 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2021-11-20 23:19:58,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:19:58,646 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:58,647 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:58,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:58,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:58,856 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:58,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:58,857 INFO L85 PathProgramCache]: Analyzing trace with hash 1347158946, now seen corresponding path program 3 times [2021-11-20 23:19:58,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:58,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899009375] [2021-11-20 23:19:58,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:58,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:58,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:59,007 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-20 23:19:59,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:59,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899009375] [2021-11-20 23:19:59,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1899009375] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:59,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993801815] [2021-11-20 23:19:59,016 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:19:59,017 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:59,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:59,019 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:59,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:19:59,080 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:19:59,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:59,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 23:19:59,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:59,218 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-20 23:19:59,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:00,632 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 23:20:00,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993801815] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:00,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [98504465] [2021-11-20 23:20:00,637 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:00,638 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:00,639 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) [2021-11-20 23:20:00,639 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:00,639 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 18 [2021-11-20 23:20:00,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432930705] [2021-11-20 23:20:00,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:00,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-20 23:20:00,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:00,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-20 23:20:00,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-11-20 23:20:00,647 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 7 states have call successors, (7), 1 states have call predecessors, (7), 7 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12) [2021-11-20 23:20:00,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:00,885 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2021-11-20 23:20:00,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:20:00,888 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 7 states have call successors, (7), 1 states have call predecessors, (7), 7 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12) Word has length 44 [2021-11-20 23:20:00,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:00,897 INFO L225 Difference]: With dead ends: 42 [2021-11-20 23:20:00,897 INFO L226 Difference]: Without dead ends: 36 [2021-11-20 23:20:00,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=195, Invalid=405, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:20:00,899 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 73 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:00,900 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 62 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:20:00,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-20 23:20:00,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-20 23:20:00,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.125) internal successors, (27), 25 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 8 states have return successors, (17), 9 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-20 23:20:00,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2021-11-20 23:20:00,924 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 44 [2021-11-20 23:20:00,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:00,925 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2021-11-20 23:20:00,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 18 states have internal predecessors, (40), 7 states have call successors, (7), 1 states have call predecessors, (7), 7 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12) [2021-11-20 23:20:00,925 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2021-11-20 23:20:00,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-20 23:20:00,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:00,933 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:00,967 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:01,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:01,148 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:01,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:01,148 INFO L85 PathProgramCache]: Analyzing trace with hash -659328604, now seen corresponding path program 4 times [2021-11-20 23:20:01,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:01,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889832793] [2021-11-20 23:20:01,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:01,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:01,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:01,339 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-20 23:20:01,340 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:01,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889832793] [2021-11-20 23:20:01,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889832793] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:01,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555766923] [2021-11-20 23:20:01,340 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:20:01,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:01,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:01,342 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:01,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:20:01,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:01,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:20:01,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:01,597 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-20 23:20:01,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:03,947 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 147 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-20 23:20:03,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [555766923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:03,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1228474751] [2021-11-20 23:20:03,950 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:03,950 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:03,950 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) [2021-11-20 23:20:03,952 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:03,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 22 [2021-11-20 23:20:03,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117526038] [2021-11-20 23:20:03,952 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:03,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-20 23:20:03,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:03,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-20 23:20:03,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2021-11-20 23:20:03,955 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 22 states have internal predecessors, (50), 9 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (16), 10 states have call predecessors, (16), 9 states have call successors, (16) [2021-11-20 23:20:04,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:04,203 INFO L93 Difference]: Finished difference Result 48 states and 62 transitions. [2021-11-20 23:20:04,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:20:04,204 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 22 states have internal predecessors, (50), 9 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (16), 10 states have call predecessors, (16), 9 states have call successors, (16) Word has length 58 [2021-11-20 23:20:04,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:04,205 INFO L225 Difference]: With dead ends: 48 [2021-11-20 23:20:04,205 INFO L226 Difference]: Without dead ends: 42 [2021-11-20 23:20:04,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=303, Invalid=627, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:20:04,207 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 172 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:04,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 75 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:20:04,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-20 23:20:04,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-11-20 23:20:04,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 3 states have call successors, (3), 1 states have call predecessors, (3), 10 states have return successors, (21), 11 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-20 23:20:04,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 55 transitions. [2021-11-20 23:20:04,219 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 55 transitions. Word has length 58 [2021-11-20 23:20:04,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:04,219 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 55 transitions. [2021-11-20 23:20:04,219 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 22 states have internal predecessors, (50), 9 states have call successors, (9), 1 states have call predecessors, (9), 9 states have return successors, (16), 10 states have call predecessors, (16), 9 states have call successors, (16) [2021-11-20 23:20:04,220 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 55 transitions. [2021-11-20 23:20:04,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-20 23:20:04,222 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:04,222 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:04,251 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-20 23:20:04,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:04,443 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:04,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:04,444 INFO L85 PathProgramCache]: Analyzing trace with hash -1137737050, now seen corresponding path program 5 times [2021-11-20 23:20:04,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:04,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836444278] [2021-11-20 23:20:04,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:04,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:04,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:04,655 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-20 23:20:04,655 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:04,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836444278] [2021-11-20 23:20:04,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836444278] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:04,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203248601] [2021-11-20 23:20:04,656 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:20:04,656 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:04,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:04,662 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:04,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:20:04,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-20 23:20:04,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:04,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:20:04,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:04,977 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-20 23:20:04,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:08,419 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 243 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-20 23:20:08,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [203248601] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:08,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [839625715] [2021-11-20 23:20:08,422 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:08,423 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:08,423 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) [2021-11-20 23:20:08,424 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:08,424 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 26 [2021-11-20 23:20:08,424 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990191797] [2021-11-20 23:20:08,424 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:08,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-20 23:20:08,425 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:08,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-20 23:20:08,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=479, Unknown=0, NotChecked=0, Total=650 [2021-11-20 23:20:08,427 INFO L87 Difference]: Start difference. First operand 42 states and 55 transitions. Second operand has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 26 states have internal predecessors, (60), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (20), 12 states have call predecessors, (20), 11 states have call successors, (20) [2021-11-20 23:20:08,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:08,726 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2021-11-20 23:20:08,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:20:08,726 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 26 states have internal predecessors, (60), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (20), 12 states have call predecessors, (20), 11 states have call successors, (20) Word has length 72 [2021-11-20 23:20:08,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:08,728 INFO L225 Difference]: With dead ends: 54 [2021-11-20 23:20:08,728 INFO L226 Difference]: Without dead ends: 48 [2021-11-20 23:20:08,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=435, Invalid=897, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:20:08,731 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 89 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:08,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 82 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:20:08,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-20 23:20:08,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-20 23:20:08,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 32 states have (on average 1.09375) internal successors, (35), 33 states have internal predecessors, (35), 3 states have call successors, (3), 1 states have call predecessors, (3), 12 states have return successors, (25), 13 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-20 23:20:08,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 63 transitions. [2021-11-20 23:20:08,744 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 63 transitions. Word has length 72 [2021-11-20 23:20:08,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:08,745 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 63 transitions. [2021-11-20 23:20:08,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 26 states have internal predecessors, (60), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (20), 12 states have call predecessors, (20), 11 states have call successors, (20) [2021-11-20 23:20:08,746 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 63 transitions. [2021-11-20 23:20:08,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-20 23:20:08,749 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:08,749 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:08,774 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:08,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 23:20:08,964 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:08,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:08,964 INFO L85 PathProgramCache]: Analyzing trace with hash 85071528, now seen corresponding path program 6 times [2021-11-20 23:20:08,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:08,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958105899] [2021-11-20 23:20:08,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:08,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:08,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:09,171 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-20 23:20:09,171 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:09,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958105899] [2021-11-20 23:20:09,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1958105899] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:09,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523345062] [2021-11-20 23:20:09,172 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:20:09,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:09,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:09,175 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:09,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:20:09,354 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:20:09,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:09,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:20:09,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:09,599 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-11-20 23:20:09,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:15,086 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 363 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-20 23:20:15,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523345062] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:15,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [272949852] [2021-11-20 23:20:15,089 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:15,089 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:15,089 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) [2021-11-20 23:20:15,091 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:15,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 30 [2021-11-20 23:20:15,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226538763] [2021-11-20 23:20:15,091 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:15,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-20 23:20:15,093 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:15,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-20 23:20:15,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=643, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:20:15,094 INFO L87 Difference]: Start difference. First operand 48 states and 63 transitions. Second operand has 30 states, 30 states have (on average 2.3333333333333335) internal successors, (70), 30 states have internal predecessors, (70), 13 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (24), 14 states have call predecessors, (24), 13 states have call successors, (24) [2021-11-20 23:20:15,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:15,402 INFO L93 Difference]: Finished difference Result 60 states and 78 transitions. [2021-11-20 23:20:15,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-20 23:20:15,402 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.3333333333333335) internal successors, (70), 30 states have internal predecessors, (70), 13 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (24), 14 states have call predecessors, (24), 13 states have call successors, (24) Word has length 86 [2021-11-20 23:20:15,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:15,404 INFO L225 Difference]: With dead ends: 60 [2021-11-20 23:20:15,404 INFO L226 Difference]: Without dead ends: 54 [2021-11-20 23:20:15,406 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=591, Invalid=1215, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:20:15,408 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 68 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:15,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 98 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:20:15,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-20 23:20:15,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-11-20 23:20:15,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 37 states have internal predecessors, (39), 3 states have call successors, (3), 1 states have call predecessors, (3), 14 states have return successors, (29), 15 states have call predecessors, (29), 3 states have call successors, (29) [2021-11-20 23:20:15,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 71 transitions. [2021-11-20 23:20:15,433 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 71 transitions. Word has length 86 [2021-11-20 23:20:15,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:15,434 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 71 transitions. [2021-11-20 23:20:15,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.3333333333333335) internal successors, (70), 30 states have internal predecessors, (70), 13 states have call successors, (13), 1 states have call predecessors, (13), 13 states have return successors, (24), 14 states have call predecessors, (24), 13 states have call successors, (24) [2021-11-20 23:20:15,434 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 71 transitions. [2021-11-20 23:20:15,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-20 23:20:15,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:15,437 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:15,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:15,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 23:20:15,652 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:15,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:15,653 INFO L85 PathProgramCache]: Analyzing trace with hash 873270698, now seen corresponding path program 7 times [2021-11-20 23:20:15,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:15,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54502693] [2021-11-20 23:20:15,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:15,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:15,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:15,903 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2021-11-20 23:20:15,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:15,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54502693] [2021-11-20 23:20:15,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54502693] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:15,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783381914] [2021-11-20 23:20:15,904 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:20:15,904 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:15,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:15,909 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:15,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:20:16,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:16,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:20:16,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:16,446 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2021-11-20 23:20:16,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:24,544 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 0 proven. 507 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-20 23:20:24,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783381914] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:24,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1674837227] [2021-11-20 23:20:24,547 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:24,547 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:24,548 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) [2021-11-20 23:20:24,548 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:24,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 34 [2021-11-20 23:20:24,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101023502] [2021-11-20 23:20:24,549 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:24,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-20 23:20:24,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:24,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-20 23:20:24,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=831, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:20:24,551 INFO L87 Difference]: Start difference. First operand 54 states and 71 transitions. Second operand has 34 states, 34 states have (on average 2.3529411764705883) internal successors, (80), 34 states have internal predecessors, (80), 15 states have call successors, (15), 1 states have call predecessors, (15), 15 states have return successors, (28), 16 states have call predecessors, (28), 15 states have call successors, (28) [2021-11-20 23:20:24,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:24,987 INFO L93 Difference]: Finished difference Result 66 states and 86 transitions. [2021-11-20 23:20:24,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-20 23:20:24,989 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.3529411764705883) internal successors, (80), 34 states have internal predecessors, (80), 15 states have call successors, (15), 1 states have call predecessors, (15), 15 states have return successors, (28), 16 states have call predecessors, (28), 15 states have call successors, (28) Word has length 100 [2021-11-20 23:20:24,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:24,990 INFO L225 Difference]: With dead ends: 66 [2021-11-20 23:20:24,990 INFO L226 Difference]: Without dead ends: 60 [2021-11-20 23:20:24,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=771, Invalid=1581, Unknown=0, NotChecked=0, Total=2352 [2021-11-20 23:20:24,996 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 403 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 278 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 419 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 278 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:24,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [419 Valid, 99 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [278 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:20:24,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-20 23:20:25,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-20 23:20:25,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 40 states have (on average 1.075) internal successors, (43), 41 states have internal predecessors, (43), 3 states have call successors, (3), 1 states have call predecessors, (3), 16 states have return successors, (33), 17 states have call predecessors, (33), 3 states have call successors, (33) [2021-11-20 23:20:25,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 79 transitions. [2021-11-20 23:20:25,016 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 79 transitions. Word has length 100 [2021-11-20 23:20:25,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:25,018 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 79 transitions. [2021-11-20 23:20:25,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.3529411764705883) internal successors, (80), 34 states have internal predecessors, (80), 15 states have call successors, (15), 1 states have call predecessors, (15), 15 states have return successors, (28), 16 states have call predecessors, (28), 15 states have call successors, (28) [2021-11-20 23:20:25,019 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 79 transitions. [2021-11-20 23:20:25,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-20 23:20:25,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:25,032 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:25,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:25,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:25,260 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:25,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:25,260 INFO L85 PathProgramCache]: Analyzing trace with hash -1707980884, now seen corresponding path program 8 times [2021-11-20 23:20:25,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:25,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [115480415] [2021-11-20 23:20:25,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:25,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:25,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:25,535 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2021-11-20 23:20:25,535 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:25,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [115480415] [2021-11-20 23:20:25,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [115480415] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:25,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755682336] [2021-11-20 23:20:25,535 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:20:25,535 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:25,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:25,536 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:25,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:20:25,881 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-20 23:20:25,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:25,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:20:25,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:26,202 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2021-11-20 23:20:26,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:38,000 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 0 proven. 675 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-20 23:20:38,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [755682336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:38,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1734049218] [2021-11-20 23:20:38,002 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:38,002 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:38,003 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java: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) [2021-11-20 23:20:38,004 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:38,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 35] total 38 [2021-11-20 23:20:38,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598306817] [2021-11-20 23:20:38,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:38,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-20 23:20:38,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:38,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-20 23:20:38,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=1043, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:20:38,007 INFO L87 Difference]: Start difference. First operand 60 states and 79 transitions. Second operand has 38 states, 38 states have (on average 2.3684210526315788) internal successors, (90), 38 states have internal predecessors, (90), 17 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (32), 18 states have call predecessors, (32), 17 states have call successors, (32) [2021-11-20 23:20:38,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:38,465 INFO L93 Difference]: Finished difference Result 72 states and 94 transitions. [2021-11-20 23:20:38,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:20:38,466 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.3684210526315788) internal successors, (90), 38 states have internal predecessors, (90), 17 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (32), 18 states have call predecessors, (32), 17 states have call successors, (32) Word has length 114 [2021-11-20 23:20:38,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:38,467 INFO L225 Difference]: With dead ends: 72 [2021-11-20 23:20:38,467 INFO L226 Difference]: Without dead ends: 66 [2021-11-20 23:20:38,468 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=975, Invalid=1995, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:20:38,469 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 436 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 454 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:38,469 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [454 Valid, 109 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:20:38,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-20 23:20:38,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-11-20 23:20:38,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 45 states have internal predecessors, (47), 3 states have call successors, (3), 1 states have call predecessors, (3), 18 states have return successors, (37), 19 states have call predecessors, (37), 3 states have call successors, (37) [2021-11-20 23:20:38,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 87 transitions. [2021-11-20 23:20:38,481 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 87 transitions. Word has length 114 [2021-11-20 23:20:38,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:38,482 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 87 transitions. [2021-11-20 23:20:38,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.3684210526315788) internal successors, (90), 38 states have internal predecessors, (90), 17 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (32), 18 states have call predecessors, (32), 17 states have call successors, (32) [2021-11-20 23:20:38,482 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 87 transitions. [2021-11-20 23:20:38,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-20 23:20:38,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:38,485 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:38,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:38,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:38,705 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:38,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:38,705 INFO L85 PathProgramCache]: Analyzing trace with hash -1292655442, now seen corresponding path program 9 times [2021-11-20 23:20:38,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:38,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459912684] [2021-11-20 23:20:38,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:38,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:38,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:38,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1020 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2021-11-20 23:20:38,976 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:38,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459912684] [2021-11-20 23:20:38,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1459912684] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:38,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814999488] [2021-11-20 23:20:38,976 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:20:38,976 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:38,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:38,978 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:38,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:20:39,491 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:20:39,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:39,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:20:39,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:39,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1020 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2021-11-20 23:20:39,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:55,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1020 backedges. 0 proven. 867 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-20 23:20:55,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [814999488] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:55,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [386179004] [2021-11-20 23:20:55,270 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:55,270 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:55,271 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) [2021-11-20 23:20:55,272 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:55,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 39] total 42 [2021-11-20 23:20:55,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530690298] [2021-11-20 23:20:55,273 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:55,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-20 23:20:55,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:55,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-20 23:20:55,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=443, Invalid=1279, Unknown=0, NotChecked=0, Total=1722 [2021-11-20 23:20:55,275 INFO L87 Difference]: Start difference. First operand 66 states and 87 transitions. Second operand has 42 states, 42 states have (on average 2.380952380952381) internal successors, (100), 42 states have internal predecessors, (100), 19 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (36), 20 states have call predecessors, (36), 19 states have call successors, (36) [2021-11-20 23:20:55,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:55,902 INFO L93 Difference]: Finished difference Result 78 states and 102 transitions. [2021-11-20 23:20:55,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:20:55,903 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.380952380952381) internal successors, (100), 42 states have internal predecessors, (100), 19 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (36), 20 states have call predecessors, (36), 19 states have call successors, (36) Word has length 128 [2021-11-20 23:20:55,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:55,904 INFO L225 Difference]: With dead ends: 78 [2021-11-20 23:20:55,904 INFO L226 Difference]: Without dead ends: 72 [2021-11-20 23:20:55,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 253 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1203, Invalid=2457, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 23:20:55,907 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 759 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 426 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 779 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 426 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:55,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [779 Valid, 119 Invalid, 586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [426 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:20:55,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-20 23:20:55,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-11-20 23:20:55,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 48 states have (on average 1.0625) internal successors, (51), 49 states have internal predecessors, (51), 3 states have call successors, (3), 1 states have call predecessors, (3), 20 states have return successors, (41), 21 states have call predecessors, (41), 3 states have call successors, (41) [2021-11-20 23:20:55,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 95 transitions. [2021-11-20 23:20:55,930 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 95 transitions. Word has length 128 [2021-11-20 23:20:55,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:55,930 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 95 transitions. [2021-11-20 23:20:55,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.380952380952381) internal successors, (100), 42 states have internal predecessors, (100), 19 states have call successors, (19), 1 states have call predecessors, (19), 19 states have return successors, (36), 20 states have call predecessors, (36), 19 states have call successors, (36) [2021-11-20 23:20:55,930 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 95 transitions. [2021-11-20 23:20:55,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-20 23:20:55,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:55,932 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:55,958 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:56,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 23:20:56,147 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:56,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:56,147 INFO L85 PathProgramCache]: Analyzing trace with hash 2116224176, now seen corresponding path program 10 times [2021-11-20 23:20:56,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:56,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861509240] [2021-11-20 23:20:56,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:56,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:56,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:56,478 INFO L134 CoverageAnalysis]: Checked inductivity of 1273 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 722 trivial. 0 not checked. [2021-11-20 23:20:56,479 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:56,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861509240] [2021-11-20 23:20:56,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861509240] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:56,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836660633] [2021-11-20 23:20:56,479 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:20:56,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:56,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:56,480 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:56,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:20:57,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:57,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-20 23:20:57,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:57,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1273 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 722 trivial. 0 not checked. [2021-11-20 23:20:57,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:19,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1273 backedges. 0 proven. 1083 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-20 23:21:19,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836660633] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:19,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [679765092] [2021-11-20 23:21:19,232 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:19,232 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:19,233 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) [2021-11-20 23:21:19,234 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:19,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 43] total 46 [2021-11-20 23:21:19,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018980059] [2021-11-20 23:21:19,234 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:19,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-20 23:21:19,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:19,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-20 23:21:19,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=531, Invalid=1539, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 23:21:19,237 INFO L87 Difference]: Start difference. First operand 72 states and 95 transitions. Second operand has 46 states, 46 states have (on average 2.391304347826087) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (40), 22 states have call predecessors, (40), 21 states have call successors, (40) [2021-11-20 23:21:19,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:19,758 INFO L93 Difference]: Finished difference Result 84 states and 110 transitions. [2021-11-20 23:21:19,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-20 23:21:19,761 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.391304347826087) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (40), 22 states have call predecessors, (40), 21 states have call successors, (40) Word has length 142 [2021-11-20 23:21:19,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:19,762 INFO L225 Difference]: With dead ends: 84 [2021-11-20 23:21:19,762 INFO L226 Difference]: Without dead ends: 78 [2021-11-20 23:21:19,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 281 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 649 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1455, Invalid=2967, Unknown=0, NotChecked=0, Total=4422 [2021-11-20 23:21:19,765 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 621 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 404 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 643 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 568 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 404 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:19,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [643 Valid, 126 Invalid, 568 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [404 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:21:19,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-20 23:21:19,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-11-20 23:21:19,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 53 states have internal predecessors, (55), 3 states have call successors, (3), 1 states have call predecessors, (3), 22 states have return successors, (45), 23 states have call predecessors, (45), 3 states have call successors, (45) [2021-11-20 23:21:19,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 103 transitions. [2021-11-20 23:21:19,778 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 103 transitions. Word has length 142 [2021-11-20 23:21:19,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:19,779 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 103 transitions. [2021-11-20 23:21:19,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.391304347826087) internal successors, (110), 46 states have internal predecessors, (110), 21 states have call successors, (21), 1 states have call predecessors, (21), 21 states have return successors, (40), 22 states have call predecessors, (40), 21 states have call successors, (40) [2021-11-20 23:21:19,780 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 103 transitions. [2021-11-20 23:21:19,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-20 23:21:19,782 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:19,782 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:19,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:20,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:20,008 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:20,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:20,008 INFO L85 PathProgramCache]: Analyzing trace with hash -638433358, now seen corresponding path program 11 times [2021-11-20 23:21:20,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:20,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679311583] [2021-11-20 23:21:20,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:20,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:20,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:20,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1554 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 882 trivial. 0 not checked. [2021-11-20 23:21:20,408 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:20,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679311583] [2021-11-20 23:21:20,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679311583] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:20,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96346469] [2021-11-20 23:21:20,408 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:21:20,409 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:20,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:20,412 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:20,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:21:21,745 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-20 23:21:21,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:21,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-20 23:21:21,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:22,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1554 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 882 trivial. 0 not checked. [2021-11-20 23:21:22,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:51,627 INFO L134 CoverageAnalysis]: Checked inductivity of 1554 backedges. 0 proven. 1323 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-20 23:21:51,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96346469] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:51,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [34709048] [2021-11-20 23:21:51,629 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:51,629 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:51,629 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) [2021-11-20 23:21:51,630 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:51,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 47] total 50 [2021-11-20 23:21:51,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806774366] [2021-11-20 23:21:51,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:51,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-20 23:21:51,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:51,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-20 23:21:51,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=627, Invalid=1823, Unknown=0, NotChecked=0, Total=2450 [2021-11-20 23:21:51,634 INFO L87 Difference]: Start difference. First operand 78 states and 103 transitions. Second operand has 50 states, 50 states have (on average 2.4) internal successors, (120), 50 states have internal predecessors, (120), 23 states have call successors, (23), 1 states have call predecessors, (23), 23 states have return successors, (44), 24 states have call predecessors, (44), 23 states have call successors, (44) [2021-11-20 23:21:52,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:52,303 INFO L93 Difference]: Finished difference Result 90 states and 118 transitions. [2021-11-20 23:21:52,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-20 23:21:52,304 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.4) internal successors, (120), 50 states have internal predecessors, (120), 23 states have call successors, (23), 1 states have call predecessors, (23), 23 states have return successors, (44), 24 states have call predecessors, (44), 23 states have call successors, (44) Word has length 156 [2021-11-20 23:21:52,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:52,305 INFO L225 Difference]: With dead ends: 90 [2021-11-20 23:21:52,306 INFO L226 Difference]: Without dead ends: 84 [2021-11-20 23:21:52,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 309 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 780 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1731, Invalid=3525, Unknown=0, NotChecked=0, Total=5256 [2021-11-20 23:21:52,309 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 366 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 371 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 390 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 559 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 371 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:52,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [390 Valid, 142 Invalid, 559 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [371 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:21:52,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-20 23:21:52,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-11-20 23:21:52,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 57 states have internal predecessors, (59), 3 states have call successors, (3), 1 states have call predecessors, (3), 24 states have return successors, (49), 25 states have call predecessors, (49), 3 states have call successors, (49) [2021-11-20 23:21:52,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 111 transitions. [2021-11-20 23:21:52,322 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 111 transitions. Word has length 156 [2021-11-20 23:21:52,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:52,323 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 111 transitions. [2021-11-20 23:21:52,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.4) internal successors, (120), 50 states have internal predecessors, (120), 23 states have call successors, (23), 1 states have call predecessors, (23), 23 states have return successors, (44), 24 states have call predecessors, (44), 23 states have call successors, (44) [2021-11-20 23:21:52,323 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 111 transitions. [2021-11-20 23:21:52,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-20 23:21:52,326 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:52,326 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:52,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:52,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:21:52,551 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:52,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:52,552 INFO L85 PathProgramCache]: Analyzing trace with hash -588034636, now seen corresponding path program 12 times [2021-11-20 23:21:52,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:52,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65930662] [2021-11-20 23:21:52,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:52,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:52,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:53,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 1058 trivial. 0 not checked. [2021-11-20 23:21:53,017 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:53,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65930662] [2021-11-20 23:21:53,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65930662] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:53,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455274388] [2021-11-20 23:21:53,018 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:21:53,018 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:53,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:53,019 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:53,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:21:54,666 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:21:54,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:54,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-20 23:21:54,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:55,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 1058 trivial. 0 not checked. [2021-11-20 23:21:55,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:35,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 0 proven. 1587 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-20 23:22:35,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455274388] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:35,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [858417607] [2021-11-20 23:22:35,576 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:22:35,576 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:35,577 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) [2021-11-20 23:22:35,578 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:35,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 51] total 54 [2021-11-20 23:22:35,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202907368] [2021-11-20 23:22:35,578 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:35,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-20 23:22:35,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:35,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-20 23:22:35,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=731, Invalid=2131, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:22:35,581 INFO L87 Difference]: Start difference. First operand 84 states and 111 transitions. Second operand has 54 states, 54 states have (on average 2.4074074074074074) internal successors, (130), 54 states have internal predecessors, (130), 25 states have call successors, (25), 1 states have call predecessors, (25), 25 states have return successors, (48), 26 states have call predecessors, (48), 25 states have call successors, (48) [2021-11-20 23:22:36,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:36,406 INFO L93 Difference]: Finished difference Result 96 states and 126 transitions. [2021-11-20 23:22:36,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-20 23:22:36,407 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.4074074074074074) internal successors, (130), 54 states have internal predecessors, (130), 25 states have call successors, (25), 1 states have call predecessors, (25), 25 states have return successors, (48), 26 states have call predecessors, (48), 25 states have call successors, (48) Word has length 170 [2021-11-20 23:22:36,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:36,409 INFO L225 Difference]: With dead ends: 96 [2021-11-20 23:22:36,409 INFO L226 Difference]: Without dead ends: 90 [2021-11-20 23:22:36,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 923 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2031, Invalid=4131, Unknown=0, NotChecked=0, Total=6162 [2021-11-20 23:22:36,412 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 1242 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 683 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1268 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 683 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:36,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1268 Valid, 155 Invalid, 891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [683 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:22:36,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-20 23:22:36,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-11-20 23:22:36,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 60 states have (on average 1.05) internal successors, (63), 61 states have internal predecessors, (63), 3 states have call successors, (3), 1 states have call predecessors, (3), 26 states have return successors, (53), 27 states have call predecessors, (53), 3 states have call successors, (53) [2021-11-20 23:22:36,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 119 transitions. [2021-11-20 23:22:36,428 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 119 transitions. Word has length 170 [2021-11-20 23:22:36,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:36,428 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 119 transitions. [2021-11-20 23:22:36,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.4074074074074074) internal successors, (130), 54 states have internal predecessors, (130), 25 states have call successors, (25), 1 states have call predecessors, (25), 25 states have return successors, (48), 26 states have call predecessors, (48), 25 states have call successors, (48) [2021-11-20 23:22:36,429 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 119 transitions. [2021-11-20 23:22:36,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-11-20 23:22:36,432 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:36,432 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:36,477 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:22:36,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 23:22:36,647 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:22:36,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:36,648 INFO L85 PathProgramCache]: Analyzing trace with hash 806876854, now seen corresponding path program 13 times [2021-11-20 23:22:36,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:36,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116347447] [2021-11-20 23:22:36,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:36,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:36,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:37,162 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1250 trivial. 0 not checked. [2021-11-20 23:22:37,162 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:37,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116347447] [2021-11-20 23:22:37,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116347447] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:37,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1010284007] [2021-11-20 23:22:37,162 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:22:37,163 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:37,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:37,164 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:37,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:22:39,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:39,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-20 23:22:39,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:39,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1250 trivial. 0 not checked. [2021-11-20 23:22:39,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:30,965 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 0 proven. 1875 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-11-20 23:23:30,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1010284007] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:30,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [304802164] [2021-11-20 23:23:30,967 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:23:30,967 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:30,967 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) [2021-11-20 23:23:30,972 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:30,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 55] total 58 [2021-11-20 23:23:30,973 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203697566] [2021-11-20 23:23:30,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:30,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-20 23:23:30,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:30,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-20 23:23:30,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=843, Invalid=2463, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:23:30,979 INFO L87 Difference]: Start difference. First operand 90 states and 119 transitions. Second operand has 58 states, 58 states have (on average 2.413793103448276) internal successors, (140), 58 states have internal predecessors, (140), 27 states have call successors, (27), 1 states have call predecessors, (27), 27 states have return successors, (52), 28 states have call predecessors, (52), 27 states have call successors, (52) [2021-11-20 23:23:31,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:31,771 INFO L93 Difference]: Finished difference Result 102 states and 134 transitions. [2021-11-20 23:23:31,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-20 23:23:31,772 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.413793103448276) internal successors, (140), 58 states have internal predecessors, (140), 27 states have call successors, (27), 1 states have call predecessors, (27), 27 states have return successors, (52), 28 states have call predecessors, (52), 27 states have call successors, (52) Word has length 184 [2021-11-20 23:23:31,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:31,774 INFO L225 Difference]: With dead ends: 102 [2021-11-20 23:23:31,774 INFO L226 Difference]: Without dead ends: 96 [2021-11-20 23:23:31,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 365 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2355, Invalid=4785, Unknown=0, NotChecked=0, Total=7140 [2021-11-20 23:23:31,777 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 800 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 569 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 828 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 569 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:31,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [828 Valid, 159 Invalid, 785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [569 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:23:31,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-20 23:23:31,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-11-20 23:23:31,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 64 states have (on average 1.046875) internal successors, (67), 65 states have internal predecessors, (67), 3 states have call successors, (3), 1 states have call predecessors, (3), 28 states have return successors, (57), 29 states have call predecessors, (57), 3 states have call successors, (57) [2021-11-20 23:23:31,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 127 transitions. [2021-11-20 23:23:31,793 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 127 transitions. Word has length 184 [2021-11-20 23:23:31,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:31,793 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 127 transitions. [2021-11-20 23:23:31,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.413793103448276) internal successors, (140), 58 states have internal predecessors, (140), 27 states have call successors, (27), 1 states have call predecessors, (27), 27 states have return successors, (52), 28 states have call predecessors, (52), 27 states have call successors, (52) [2021-11-20 23:23:31,794 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 127 transitions. [2021-11-20 23:23:31,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2021-11-20 23:23:31,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:31,797 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:31,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:32,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 23:23:32,023 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:32,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:32,024 INFO L85 PathProgramCache]: Analyzing trace with hash 1756504760, now seen corresponding path program 14 times [2021-11-20 23:23:32,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:32,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315343905] [2021-11-20 23:23:32,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:32,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:32,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:32,783 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 1458 trivial. 0 not checked. [2021-11-20 23:23:32,784 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:32,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315343905] [2021-11-20 23:23:32,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315343905] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:32,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011029209] [2021-11-20 23:23:32,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:23:32,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:32,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:32,786 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:32,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 23:23:35,566 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-11-20 23:23:35,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:23:35,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-20 23:23:35,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:35,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 1458 trivial. 0 not checked. [2021-11-20 23:23:35,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:41,630 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 0 proven. 2187 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-11-20 23:24:41,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1011029209] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:41,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1663810161] [2021-11-20 23:24:41,632 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:24:41,632 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:41,633 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java: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) [2021-11-20 23:24:41,634 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:41,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 59] total 62 [2021-11-20 23:24:41,634 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228872221] [2021-11-20 23:24:41,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:41,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-20 23:24:41,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:41,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-20 23:24:41,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=963, Invalid=2819, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 23:24:41,638 INFO L87 Difference]: Start difference. First operand 96 states and 127 transitions. Second operand has 62 states, 62 states have (on average 2.4193548387096775) internal successors, (150), 62 states have internal predecessors, (150), 29 states have call successors, (29), 1 states have call predecessors, (29), 29 states have return successors, (56), 30 states have call predecessors, (56), 29 states have call successors, (56) [2021-11-20 23:24:42,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:42,587 INFO L93 Difference]: Finished difference Result 108 states and 142 transitions. [2021-11-20 23:24:42,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-20 23:24:42,587 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.4193548387096775) internal successors, (150), 62 states have internal predecessors, (150), 29 states have call successors, (29), 1 states have call predecessors, (29), 29 states have return successors, (56), 30 states have call predecessors, (56), 29 states have call successors, (56) Word has length 198 [2021-11-20 23:24:42,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:42,589 INFO L225 Difference]: With dead ends: 108 [2021-11-20 23:24:42,590 INFO L226 Difference]: Without dead ends: 102 [2021-11-20 23:24:42,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 393 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1245 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2703, Invalid=5487, Unknown=0, NotChecked=0, Total=8190 [2021-11-20 23:24:42,594 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 1461 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 999 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1491 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 1201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 999 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:42,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1491 Valid, 160 Invalid, 1201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [999 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:24:42,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-20 23:24:42,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2021-11-20 23:24:42,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 69 states have internal predecessors, (71), 3 states have call successors, (3), 1 states have call predecessors, (3), 30 states have return successors, (61), 31 states have call predecessors, (61), 3 states have call successors, (61) [2021-11-20 23:24:42,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 135 transitions. [2021-11-20 23:24:42,611 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 135 transitions. Word has length 198 [2021-11-20 23:24:42,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:42,612 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 135 transitions. [2021-11-20 23:24:42,613 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.4193548387096775) internal successors, (150), 62 states have internal predecessors, (150), 29 states have call successors, (29), 1 states have call predecessors, (29), 29 states have return successors, (56), 30 states have call predecessors, (56), 29 states have call successors, (56) [2021-11-20 23:24:42,613 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 135 transitions. [2021-11-20 23:24:42,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-11-20 23:24:42,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:42,616 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:42,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 23:24:42,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:42,831 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:24:42,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:42,832 INFO L85 PathProgramCache]: Analyzing trace with hash 1651749306, now seen corresponding path program 15 times [2021-11-20 23:24:42,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:42,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579767178] [2021-11-20 23:24:42,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:42,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:42,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:43,427 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1682 trivial. 0 not checked. [2021-11-20 23:24:43,427 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:43,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579767178] [2021-11-20 23:24:43,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579767178] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:43,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164957779] [2021-11-20 23:24:43,428 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:24:43,428 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:43,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:43,429 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:43,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 23:24:47,131 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:24:47,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:24:47,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 605 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-20 23:24:47,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:47,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1682 trivial. 0 not checked. [2021-11-20 23:24:47,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:26:10,637 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 0 proven. 2523 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2021-11-20 23:26:10,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1164957779] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:26:10,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1275057793] [2021-11-20 23:26:10,639 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:26:10,640 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:26:10,640 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) [2021-11-20 23:26:10,640 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:26:10,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 63] total 66 [2021-11-20 23:26:10,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144817019] [2021-11-20 23:26:10,641 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:26:10,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-20 23:26:10,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:26:10,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-20 23:26:10,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1091, Invalid=3199, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 23:26:10,644 INFO L87 Difference]: Start difference. First operand 102 states and 135 transitions. Second operand has 66 states, 66 states have (on average 2.4242424242424243) internal successors, (160), 66 states have internal predecessors, (160), 31 states have call successors, (31), 1 states have call predecessors, (31), 31 states have return successors, (60), 32 states have call predecessors, (60), 31 states have call successors, (60) [2021-11-20 23:26:11,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:26:11,924 INFO L93 Difference]: Finished difference Result 114 states and 150 transitions. [2021-11-20 23:26:11,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-20 23:26:11,925 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.4242424242424243) internal successors, (160), 66 states have internal predecessors, (160), 31 states have call successors, (31), 1 states have call predecessors, (31), 31 states have return successors, (60), 32 states have call predecessors, (60), 31 states have call successors, (60) Word has length 212 [2021-11-20 23:26:11,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:26:11,928 INFO L225 Difference]: With dead ends: 114 [2021-11-20 23:26:11,928 INFO L226 Difference]: Without dead ends: 108 [2021-11-20 23:26:11,930 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 421 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1424 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=3075, Invalid=6237, Unknown=0, NotChecked=0, Total=9312 [2021-11-20 23:26:11,930 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 1435 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 1033 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1467 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 1278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1033 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:26:11,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1467 Valid, 182 Invalid, 1278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1033 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:26:11,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-20 23:26:11,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2021-11-20 23:26:11,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 73 states have internal predecessors, (75), 3 states have call successors, (3), 1 states have call predecessors, (3), 32 states have return successors, (65), 33 states have call predecessors, (65), 3 states have call successors, (65) [2021-11-20 23:26:11,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 143 transitions. [2021-11-20 23:26:11,953 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 143 transitions. Word has length 212 [2021-11-20 23:26:11,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:26:11,954 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 143 transitions. [2021-11-20 23:26:11,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.4242424242424243) internal successors, (160), 66 states have internal predecessors, (160), 31 states have call successors, (31), 1 states have call predecessors, (31), 31 states have return successors, (60), 32 states have call predecessors, (60), 31 states have call successors, (60) [2021-11-20 23:26:11,955 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 143 transitions. [2021-11-20 23:26:11,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-11-20 23:26:11,959 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:26:11,959 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:26:12,083 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 23:26:12,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 23:26:12,280 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:26:12,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:26:12,282 INFO L85 PathProgramCache]: Analyzing trace with hash -1720810564, now seen corresponding path program 16 times [2021-11-20 23:26:12,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:26:12,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104054904] [2021-11-20 23:26:12,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:26:12,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:26:12,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:12,994 INFO L134 CoverageAnalysis]: Checked inductivity of 3379 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1922 trivial. 0 not checked. [2021-11-20 23:26:12,994 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:26:12,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104054904] [2021-11-20 23:26:12,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2104054904] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:26:12,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210929237] [2021-11-20 23:26:12,994 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:26:12,994 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:12,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:26:12,995 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:26:12,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 23:26:17,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:17,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-20 23:26:17,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:26:18,099 INFO L134 CoverageAnalysis]: Checked inductivity of 3379 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1922 trivial. 0 not checked. [2021-11-20 23:26:18,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:28:03,508 INFO L134 CoverageAnalysis]: Checked inductivity of 3379 backedges. 0 proven. 2883 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2021-11-20 23:28:03,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210929237] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:28:03,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [92590177] [2021-11-20 23:28:03,510 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:28:03,511 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:28:03,511 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) [2021-11-20 23:28:03,512 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:28:03,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 67] total 70 [2021-11-20 23:28:03,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41258339] [2021-11-20 23:28:03,512 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:28:03,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-20 23:28:03,513 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:28:03,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-20 23:28:03,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=3603, Unknown=0, NotChecked=0, Total=4830 [2021-11-20 23:28:03,515 INFO L87 Difference]: Start difference. First operand 108 states and 143 transitions. Second operand has 70 states, 70 states have (on average 2.4285714285714284) internal successors, (170), 70 states have internal predecessors, (170), 33 states have call successors, (33), 1 states have call predecessors, (33), 33 states have return successors, (64), 34 states have call predecessors, (64), 33 states have call successors, (64) [2021-11-20 23:28:04,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:28:04,747 INFO L93 Difference]: Finished difference Result 120 states and 158 transitions. [2021-11-20 23:28:04,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-20 23:28:04,748 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.4285714285714284) internal successors, (170), 70 states have internal predecessors, (170), 33 states have call successors, (33), 1 states have call predecessors, (33), 33 states have return successors, (64), 34 states have call predecessors, (64), 33 states have call successors, (64) Word has length 226 [2021-11-20 23:28:04,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:28:04,749 INFO L225 Difference]: With dead ends: 120 [2021-11-20 23:28:04,749 INFO L226 Difference]: Without dead ends: 114 [2021-11-20 23:28:04,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 550 GetRequests, 449 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1615 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=3471, Invalid=7035, Unknown=0, NotChecked=0, Total=10506 [2021-11-20 23:28:04,751 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 1736 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 1341 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1770 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 1602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1341 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:28:04,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1770 Valid, 198 Invalid, 1602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1341 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:28:04,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-20 23:28:04,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2021-11-20 23:28:04,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 77 states have internal predecessors, (79), 3 states have call successors, (3), 1 states have call predecessors, (3), 34 states have return successors, (69), 35 states have call predecessors, (69), 3 states have call successors, (69) [2021-11-20 23:28:04,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 151 transitions. [2021-11-20 23:28:04,771 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 151 transitions. Word has length 226 [2021-11-20 23:28:04,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:28:04,771 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 151 transitions. [2021-11-20 23:28:04,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.4285714285714284) internal successors, (170), 70 states have internal predecessors, (170), 33 states have call successors, (33), 1 states have call predecessors, (33), 33 states have return successors, (64), 34 states have call predecessors, (64), 33 states have call successors, (64) [2021-11-20 23:28:04,772 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 151 transitions. [2021-11-20 23:28:04,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2021-11-20 23:28:04,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:28:04,776 INFO L514 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:28:04,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-20 23:28:04,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 23:28:04,991 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:28:04,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:28:04,992 INFO L85 PathProgramCache]: Analyzing trace with hash -2079033154, now seen corresponding path program 17 times [2021-11-20 23:28:04,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:28:04,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638162170] [2021-11-20 23:28:04,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:28:04,993 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:28:05,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:05,811 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 2178 trivial. 0 not checked. [2021-11-20 23:28:05,811 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:28:05,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638162170] [2021-11-20 23:28:05,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638162170] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:28:05,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766319480] [2021-11-20 23:28:05,812 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:28:05,812 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:05,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:28:05,815 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:28:05,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-20 23:28:11,978 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-11-20 23:28:11,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:28:11,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 681 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-20 23:28:11,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:28:12,452 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 2178 trivial. 0 not checked. [2021-11-20 23:28:12,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:30:24,132 INFO L134 CoverageAnalysis]: Checked inductivity of 3828 backedges. 0 proven. 3267 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2021-11-20 23:30:24,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766319480] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:30:24,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [881680026] [2021-11-20 23:30:24,135 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:30:24,135 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:30:24,135 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) [2021-11-20 23:30:24,136 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:30:24,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 71] total 74 [2021-11-20 23:30:24,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987325322] [2021-11-20 23:30:24,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:30:24,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-20 23:30:24,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:30:24,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-20 23:30:24,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1371, Invalid=4031, Unknown=0, NotChecked=0, Total=5402 [2021-11-20 23:30:24,140 INFO L87 Difference]: Start difference. First operand 114 states and 151 transitions. Second operand has 74 states, 74 states have (on average 2.4324324324324325) internal successors, (180), 74 states have internal predecessors, (180), 35 states have call successors, (35), 1 states have call predecessors, (35), 35 states have return successors, (68), 36 states have call predecessors, (68), 35 states have call successors, (68) [2021-11-20 23:30:25,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:30:25,439 INFO L93 Difference]: Finished difference Result 126 states and 166 transitions. [2021-11-20 23:30:25,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-20 23:30:25,440 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.4324324324324325) internal successors, (180), 74 states have internal predecessors, (180), 35 states have call successors, (35), 1 states have call predecessors, (35), 35 states have return successors, (68), 36 states have call predecessors, (68), 35 states have call successors, (68) Word has length 240 [2021-11-20 23:30:25,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:30:25,444 INFO L225 Difference]: With dead ends: 126 [2021-11-20 23:30:25,444 INFO L226 Difference]: Without dead ends: 120 [2021-11-20 23:30:25,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1818 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3891, Invalid=7881, Unknown=0, NotChecked=0, Total=11772 [2021-11-20 23:30:25,447 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 1943 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 1158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1979 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 1407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1158 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:30:25,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1979 Valid, 193 Invalid, 1407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1158 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:30:25,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-20 23:30:25,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2021-11-20 23:30:25,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 80 states have (on average 1.0375) internal successors, (83), 81 states have internal predecessors, (83), 3 states have call successors, (3), 1 states have call predecessors, (3), 36 states have return successors, (73), 37 states have call predecessors, (73), 3 states have call successors, (73) [2021-11-20 23:30:25,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 159 transitions. [2021-11-20 23:30:25,469 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 159 transitions. Word has length 240 [2021-11-20 23:30:25,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:30:25,470 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 159 transitions. [2021-11-20 23:30:25,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.4324324324324325) internal successors, (180), 74 states have internal predecessors, (180), 35 states have call successors, (35), 1 states have call predecessors, (35), 35 states have return successors, (68), 36 states have call predecessors, (68), 35 states have call successors, (68) [2021-11-20 23:30:25,470 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 159 transitions. [2021-11-20 23:30:25,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2021-11-20 23:30:25,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:30:25,475 INFO L514 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:30:25,543 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-20 23:30:25,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 23:30:25,697 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:30:25,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:30:25,698 INFO L85 PathProgramCache]: Analyzing trace with hash -315133760, now seen corresponding path program 18 times [2021-11-20 23:30:25,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:30:25,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874668148] [2021-11-20 23:30:25,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:30:25,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:30:25,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:30:26,662 INFO L134 CoverageAnalysis]: Checked inductivity of 4305 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 2450 trivial. 0 not checked. [2021-11-20 23:30:26,662 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:30:26,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874668148] [2021-11-20 23:30:26,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874668148] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:30:26,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398989596] [2021-11-20 23:30:26,663 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:30:26,663 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:30:26,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:30:26,664 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:30:26,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_543997de-ce06-46bd-8c70-ed68c50afdae/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-20 23:30:34,244 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:30:34,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:30:34,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 719 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-20 23:30:34,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:30:34,848 INFO L134 CoverageAnalysis]: Checked inductivity of 4305 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 2450 trivial. 0 not checked. [2021-11-20 23:30:34,848 INFO L328 TraceCheckSpWp]: Computing backward predicates...