./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label16.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_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/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_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label16.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/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_220d7637-8a94-40fd-9049-a68855d079b6/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 b3ca7ac045e48d38881d30e6a93ef4c7dacfed0b5d9d8607f5d28bf43102d8b7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 22:50:02,787 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 22:50:02,789 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 22:50:02,846 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 22:50:02,846 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 22:50:02,848 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 22:50:02,850 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 22:50:02,852 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 22:50:02,854 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 22:50:02,855 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 22:50:02,856 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 22:50:02,858 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 22:50:02,858 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 22:50:02,860 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 22:50:02,861 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 22:50:02,863 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 22:50:02,864 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 22:50:02,865 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 22:50:02,867 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 22:50:02,870 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 22:50:02,872 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 22:50:02,874 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 22:50:02,875 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 22:50:02,876 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 22:50:02,880 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 22:50:02,881 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 22:50:02,881 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 22:50:02,882 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 22:50:02,883 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 22:50:02,884 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 22:50:02,884 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 22:50:02,885 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 22:50:02,886 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 22:50:02,887 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 22:50:02,888 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 22:50:02,889 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 22:50:02,890 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 22:50:02,890 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 22:50:02,890 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 22:50:02,891 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 22:50:02,892 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 22:50:02,893 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 22:50:02,932 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 22:50:02,933 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 22:50:02,933 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 22:50:02,933 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 22:50:02,934 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 22:50:02,934 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 22:50:02,935 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 22:50:02,935 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 22:50:02,935 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 22:50:02,935 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 22:50:02,936 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 22:50:02,936 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 22:50:02,937 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 22:50:02,937 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 22:50:02,937 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 22:50:02,937 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 22:50:02,937 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 22:50:02,938 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 22:50:02,938 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 22:50:02,939 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 22:50:02,939 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 22:50:02,939 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 22:50:02,939 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 22:50:02,939 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 22:50:02,939 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 22:50:02,940 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 22:50:02,941 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 22:50:02,941 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 22:50:02,942 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 22:50:02,942 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 22:50:02,942 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 22:50:02,942 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 22:50:02,943 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:50:02,943 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 22:50:02,943 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 22:50:02,943 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 22:50:02,943 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 22:50:02,944 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 22:50:02,944 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 22:50:02,944 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 22:50:02,944 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 22:50:02,944 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_220d7637-8a94-40fd-9049-a68855d079b6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3ca7ac045e48d38881d30e6a93ef4c7dacfed0b5d9d8607f5d28bf43102d8b7 [2021-11-20 22:50:03,224 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 22:50:03,246 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 22:50:03,248 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 22:50:03,249 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 22:50:03,250 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 22:50:03,252 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/eca-rers2012/Problem03_label16.c [2021-11-20 22:50:03,343 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/data/bf32a2355/9007818c5cf242c789c8b2da9c9c13d5/FLAG0e9a19455 [2021-11-20 22:50:04,037 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 22:50:04,038 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/sv-benchmarks/c/eca-rers2012/Problem03_label16.c [2021-11-20 22:50:04,062 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/data/bf32a2355/9007818c5cf242c789c8b2da9c9c13d5/FLAG0e9a19455 [2021-11-20 22:50:04,201 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/data/bf32a2355/9007818c5cf242c789c8b2da9c9c13d5 [2021-11-20 22:50:04,204 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 22:50:04,205 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 22:50:04,207 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 22:50:04,207 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 22:50:04,210 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 22:50:04,211 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:50:04" (1/1) ... [2021-11-20 22:50:04,212 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@65a8aa3e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:04, skipping insertion in model container [2021-11-20 22:50:04,212 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:50:04" (1/1) ... [2021-11-20 22:50:04,219 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 22:50:04,292 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 22:50:04,937 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_220d7637-8a94-40fd-9049-a68855d079b6/sv-benchmarks/c/eca-rers2012/Problem03_label16.c[56490,56503] [2021-11-20 22:50:04,978 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:50:04,988 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 22:50:05,224 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_220d7637-8a94-40fd-9049-a68855d079b6/sv-benchmarks/c/eca-rers2012/Problem03_label16.c[56490,56503] [2021-11-20 22:50:05,236 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:50:05,255 INFO L208 MainTranslator]: Completed translation [2021-11-20 22:50:05,256 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05 WrapperNode [2021-11-20 22:50:05,256 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 22:50:05,257 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 22:50:05,257 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 22:50:05,257 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 22:50:05,265 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05" (1/1) ... [2021-11-20 22:50:05,314 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05" (1/1) ... [2021-11-20 22:50:05,418 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-20 22:50:05,418 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 22:50:05,419 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 22:50:05,419 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 22:50:05,420 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 22:50:05,428 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05" (1/1) ... [2021-11-20 22:50:05,428 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05" (1/1) ... [2021-11-20 22:50:05,434 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05" (1/1) ... [2021-11-20 22:50:05,435 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05" (1/1) ... [2021-11-20 22:50:05,479 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05" (1/1) ... [2021-11-20 22:50:05,494 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05" (1/1) ... [2021-11-20 22:50:05,505 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05" (1/1) ... [2021-11-20 22:50:05,521 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 22:50:05,522 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 22:50:05,522 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 22:50:05,522 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 22:50:05,540 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05" (1/1) ... [2021-11-20 22:50:05,547 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:50:05,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:05,577 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 22:50:05,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 22:50:05,630 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 22:50:05,630 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 22:50:05,631 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 22:50:05,631 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 22:50:05,717 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 22:50:05,719 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 22:50:07,530 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 22:50:07,849 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 22:50:07,849 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-20 22:50:07,852 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:50:07 BoogieIcfgContainer [2021-11-20 22:50:07,853 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 22:50:07,857 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 22:50:07,857 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 22:50:07,861 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 22:50:07,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 10:50:04" (1/3) ... [2021-11-20 22:50:07,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65cb5267 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:50:07, skipping insertion in model container [2021-11-20 22:50:07,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:50:05" (2/3) ... [2021-11-20 22:50:07,863 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65cb5267 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:50:07, skipping insertion in model container [2021-11-20 22:50:07,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:50:07" (3/3) ... [2021-11-20 22:50:07,865 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label16.c [2021-11-20 22:50:07,871 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 22:50:07,871 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 22:50:07,938 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 22:50:07,949 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 22:50:07,949 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 22:50:07,978 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:08,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 22:50:08,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:08,001 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:08,002 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:08,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:08,008 INFO L85 PathProgramCache]: Analyzing trace with hash -1724864008, now seen corresponding path program 1 times [2021-11-20 22:50:08,017 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:08,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192383241] [2021-11-20 22:50:08,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:08,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:08,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:08,682 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 22:50:08,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:08,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192383241] [2021-11-20 22:50:08,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192383241] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:08,684 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:08,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:50:08,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150627825] [2021-11-20 22:50:08,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:08,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:08,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:08,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:08,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:08,738 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:09,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:09,684 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-20 22:50:09,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:09,688 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-20 22:50:09,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:09,703 INFO L225 Difference]: With dead ends: 440 [2021-11-20 22:50:09,703 INFO L226 Difference]: Without dead ends: 289 [2021-11-20 22:50:09,707 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:09,710 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 30 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:09,711 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 53 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 22:50:09,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-20 22:50:09,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-20 22:50:09,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8090277777777777) internal successors, (521), 288 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:09,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 521 transitions. [2021-11-20 22:50:09,770 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 521 transitions. Word has length 143 [2021-11-20 22:50:09,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:09,772 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 521 transitions. [2021-11-20 22:50:09,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:09,772 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 521 transitions. [2021-11-20 22:50:09,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-20 22:50:09,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:09,776 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:09,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 22:50:09,777 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:09,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:09,778 INFO L85 PathProgramCache]: Analyzing trace with hash 1763838799, now seen corresponding path program 1 times [2021-11-20 22:50:09,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:09,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446307666] [2021-11-20 22:50:09,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:09,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:09,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:09,871 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:09,872 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:09,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446307666] [2021-11-20 22:50:09,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446307666] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:09,872 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:09,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:50:09,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595478122] [2021-11-20 22:50:09,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:09,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:09,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:09,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:09,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:09,876 INFO L87 Difference]: Start difference. First operand 289 states and 521 transitions. Second operand has 3 states, 3 states have (on average 49.0) internal successors, (147), 2 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:10,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:10,584 INFO L93 Difference]: Finished difference Result 865 states and 1561 transitions. [2021-11-20 22:50:10,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:10,585 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.0) internal successors, (147), 2 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 147 [2021-11-20 22:50:10,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:10,589 INFO L225 Difference]: With dead ends: 865 [2021-11-20 22:50:10,590 INFO L226 Difference]: Without dead ends: 577 [2021-11-20 22:50:10,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:10,593 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 179 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:10,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 57 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 568 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 22:50:10,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2021-11-20 22:50:10,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 575. [2021-11-20 22:50:10,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.7822299651567943) internal successors, (1023), 574 states have internal predecessors, (1023), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:10,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 1023 transitions. [2021-11-20 22:50:10,632 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 1023 transitions. Word has length 147 [2021-11-20 22:50:10,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:10,633 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 1023 transitions. [2021-11-20 22:50:10,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.0) internal successors, (147), 2 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:10,634 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 1023 transitions. [2021-11-20 22:50:10,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-20 22:50:10,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:10,639 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:10,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 22:50:10,640 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:10,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:10,641 INFO L85 PathProgramCache]: Analyzing trace with hash 1826151602, now seen corresponding path program 1 times [2021-11-20 22:50:10,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:10,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051277625] [2021-11-20 22:50:10,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:10,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:10,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:10,742 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:10,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:10,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051277625] [2021-11-20 22:50:10,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1051277625] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:10,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271846178] [2021-11-20 22:50:10,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:10,744 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:10,744 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:10,746 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:10,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 22:50:10,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:10,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 22:50:10,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:11,387 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 22:50:11,388 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:50:11,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271846178] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:11,388 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:50:11,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-20 22:50:11,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890714] [2021-11-20 22:50:11,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:11,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:11,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:11,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:11,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:11,391 INFO L87 Difference]: Start difference. First operand 575 states and 1023 transitions. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:12,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:12,213 INFO L93 Difference]: Finished difference Result 1721 states and 3066 transitions. [2021-11-20 22:50:12,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:12,214 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 154 [2021-11-20 22:50:12,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:12,220 INFO L225 Difference]: With dead ends: 1721 [2021-11-20 22:50:12,220 INFO L226 Difference]: Without dead ends: 1147 [2021-11-20 22:50:12,223 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:12,225 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 160 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:12,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 71 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 22:50:12,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2021-11-20 22:50:12,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 861. [2021-11-20 22:50:12,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 861 states, 860 states have (on average 1.7) internal successors, (1462), 860 states have internal predecessors, (1462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:12,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 861 states to 861 states and 1462 transitions. [2021-11-20 22:50:12,260 INFO L78 Accepts]: Start accepts. Automaton has 861 states and 1462 transitions. Word has length 154 [2021-11-20 22:50:12,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:12,260 INFO L470 AbstractCegarLoop]: Abstraction has 861 states and 1462 transitions. [2021-11-20 22:50:12,260 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:12,261 INFO L276 IsEmpty]: Start isEmpty. Operand 861 states and 1462 transitions. [2021-11-20 22:50:12,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-20 22:50:12,265 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:12,265 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:12,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:12,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:12,491 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:12,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:12,492 INFO L85 PathProgramCache]: Analyzing trace with hash -546834578, now seen corresponding path program 1 times [2021-11-20 22:50:12,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:12,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600435013] [2021-11-20 22:50:12,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:12,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:12,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:12,597 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 22:50:12,597 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:12,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600435013] [2021-11-20 22:50:12,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1600435013] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:12,598 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:12,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:50:12,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357583990] [2021-11-20 22:50:12,598 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:12,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:12,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:12,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:12,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:12,600 INFO L87 Difference]: Start difference. First operand 861 states and 1462 transitions. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:13,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:13,464 INFO L93 Difference]: Finished difference Result 2579 states and 4383 transitions. [2021-11-20 22:50:13,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:13,464 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 155 [2021-11-20 22:50:13,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:13,476 INFO L225 Difference]: With dead ends: 2579 [2021-11-20 22:50:13,476 INFO L226 Difference]: Without dead ends: 1719 [2021-11-20 22:50:13,478 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:13,479 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 148 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:13,480 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 45 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 22:50:13,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1719 states. [2021-11-20 22:50:13,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1719 to 1719. [2021-11-20 22:50:13,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1719 states, 1718 states have (on average 1.6536670547147847) internal successors, (2841), 1718 states have internal predecessors, (2841), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:13,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1719 states to 1719 states and 2841 transitions. [2021-11-20 22:50:13,540 INFO L78 Accepts]: Start accepts. Automaton has 1719 states and 2841 transitions. Word has length 155 [2021-11-20 22:50:13,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:13,540 INFO L470 AbstractCegarLoop]: Abstraction has 1719 states and 2841 transitions. [2021-11-20 22:50:13,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:13,541 INFO L276 IsEmpty]: Start isEmpty. Operand 1719 states and 2841 transitions. [2021-11-20 22:50:13,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-11-20 22:50:13,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:13,546 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:13,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 22:50:13,547 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:13,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:13,548 INFO L85 PathProgramCache]: Analyzing trace with hash 37008849, now seen corresponding path program 1 times [2021-11-20 22:50:13,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:13,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1361232331] [2021-11-20 22:50:13,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:13,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:13,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:13,637 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 22:50:13,637 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:13,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1361232331] [2021-11-20 22:50:13,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1361232331] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:13,638 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:13,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 22:50:13,638 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248017369] [2021-11-20 22:50:13,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:13,639 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:13,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:13,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:13,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:13,645 INFO L87 Difference]: Start difference. First operand 1719 states and 2841 transitions. Second operand has 3 states, 3 states have (on average 52.333333333333336) internal successors, (157), 3 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:14,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:14,518 INFO L93 Difference]: Finished difference Result 5153 states and 8520 transitions. [2021-11-20 22:50:14,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:14,519 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.333333333333336) internal successors, (157), 3 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 162 [2021-11-20 22:50:14,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:14,537 INFO L225 Difference]: With dead ends: 5153 [2021-11-20 22:50:14,537 INFO L226 Difference]: Without dead ends: 3435 [2021-11-20 22:50:14,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:14,544 INFO L933 BasicCegarLoop]: 259 mSDtfsCounter, 142 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:14,545 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 263 Invalid, 604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 22:50:14,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-20 22:50:14,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-20 22:50:14,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.4953407105416423) internal successors, (5135), 3434 states have internal predecessors, (5135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:14,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 5135 transitions. [2021-11-20 22:50:14,652 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 5135 transitions. Word has length 162 [2021-11-20 22:50:14,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:14,653 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 5135 transitions. [2021-11-20 22:50:14,654 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.333333333333336) internal successors, (157), 3 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:14,654 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 5135 transitions. [2021-11-20 22:50:14,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-20 22:50:14,661 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:14,661 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:14,661 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 22:50:14,662 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:14,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:14,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1836477602, now seen corresponding path program 1 times [2021-11-20 22:50:14,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:14,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995703558] [2021-11-20 22:50:14,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:14,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:14,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:14,766 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:50:14,766 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:14,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995703558] [2021-11-20 22:50:14,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995703558] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:14,767 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:14,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:50:14,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553925466] [2021-11-20 22:50:14,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:14,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:14,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:14,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:14,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:14,770 INFO L87 Difference]: Start difference. First operand 3435 states and 5135 transitions. Second operand has 3 states, 3 states have (on average 57.0) internal successors, (171), 2 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:15,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:15,653 INFO L93 Difference]: Finished difference Result 9874 states and 14828 transitions. [2021-11-20 22:50:15,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:15,653 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 2 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 171 [2021-11-20 22:50:15,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:15,689 INFO L225 Difference]: With dead ends: 9874 [2021-11-20 22:50:15,689 INFO L226 Difference]: Without dead ends: 6440 [2021-11-20 22:50:15,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:15,700 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 138 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:15,700 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 72 Invalid, 612 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 22:50:15,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6440 states. [2021-11-20 22:50:15,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6440 to 6438. [2021-11-20 22:50:15,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6438 states, 6437 states have (on average 1.4520739474910673) internal successors, (9347), 6437 states have internal predecessors, (9347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:15,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6438 states to 6438 states and 9347 transitions. [2021-11-20 22:50:15,885 INFO L78 Accepts]: Start accepts. Automaton has 6438 states and 9347 transitions. Word has length 171 [2021-11-20 22:50:15,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:15,885 INFO L470 AbstractCegarLoop]: Abstraction has 6438 states and 9347 transitions. [2021-11-20 22:50:15,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 2 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:15,886 INFO L276 IsEmpty]: Start isEmpty. Operand 6438 states and 9347 transitions. [2021-11-20 22:50:15,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-20 22:50:15,899 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:15,900 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:15,900 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-20 22:50:15,900 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:15,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:15,901 INFO L85 PathProgramCache]: Analyzing trace with hash -156868154, now seen corresponding path program 1 times [2021-11-20 22:50:15,901 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:15,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947896749] [2021-11-20 22:50:15,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:15,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:15,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:15,981 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 34 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 22:50:15,981 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:15,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947896749] [2021-11-20 22:50:15,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947896749] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:15,982 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:15,982 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:50:15,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096601791] [2021-11-20 22:50:15,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:15,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:15,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:15,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:15,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:15,986 INFO L87 Difference]: Start difference. First operand 6438 states and 9347 transitions. Second operand has 3 states, 3 states have (on average 54.0) internal successors, (162), 2 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:16,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:16,918 INFO L93 Difference]: Finished difference Result 16879 states and 24866 transitions. [2021-11-20 22:50:16,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:16,918 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 54.0) internal successors, (162), 2 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 187 [2021-11-20 22:50:16,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:16,972 INFO L225 Difference]: With dead ends: 16879 [2021-11-20 22:50:16,972 INFO L226 Difference]: Without dead ends: 10442 [2021-11-20 22:50:16,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:16,982 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 138 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 577 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:16,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 104 Invalid, 577 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 22:50:16,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10442 states. [2021-11-20 22:50:17,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10442 to 9155. [2021-11-20 22:50:17,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9155 states, 9154 states have (on average 1.355473017260214) internal successors, (12408), 9154 states have internal predecessors, (12408), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:17,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9155 states to 9155 states and 12408 transitions. [2021-11-20 22:50:17,326 INFO L78 Accepts]: Start accepts. Automaton has 9155 states and 12408 transitions. Word has length 187 [2021-11-20 22:50:17,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:17,327 INFO L470 AbstractCegarLoop]: Abstraction has 9155 states and 12408 transitions. [2021-11-20 22:50:17,327 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.0) internal successors, (162), 2 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:17,328 INFO L276 IsEmpty]: Start isEmpty. Operand 9155 states and 12408 transitions. [2021-11-20 22:50:17,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-11-20 22:50:17,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:17,345 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:17,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-20 22:50:17,345 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:17,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:17,346 INFO L85 PathProgramCache]: Analyzing trace with hash 1919440885, now seen corresponding path program 1 times [2021-11-20 22:50:17,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:17,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975955283] [2021-11-20 22:50:17,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:17,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:17,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:17,441 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-20 22:50:17,441 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:17,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975955283] [2021-11-20 22:50:17,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975955283] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:17,442 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:17,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 22:50:17,443 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179256967] [2021-11-20 22:50:17,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:17,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:17,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:17,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:17,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:17,445 INFO L87 Difference]: Start difference. First operand 9155 states and 12408 transitions. Second operand has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:18,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:18,311 INFO L93 Difference]: Finished difference Result 21455 states and 29154 transitions. [2021-11-20 22:50:18,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:18,312 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 197 [2021-11-20 22:50:18,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:18,413 INFO L225 Difference]: With dead ends: 21455 [2021-11-20 22:50:18,413 INFO L226 Difference]: Without dead ends: 12301 [2021-11-20 22:50:18,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:18,425 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 132 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:18,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 245 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 22:50:18,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12301 states. [2021-11-20 22:50:18,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12301 to 12158. [2021-11-20 22:50:18,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12158 states, 12157 states have (on average 1.3063255737435222) internal successors, (15881), 12157 states have internal predecessors, (15881), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:18,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12158 states to 12158 states and 15881 transitions. [2021-11-20 22:50:18,686 INFO L78 Accepts]: Start accepts. Automaton has 12158 states and 15881 transitions. Word has length 197 [2021-11-20 22:50:18,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:18,686 INFO L470 AbstractCegarLoop]: Abstraction has 12158 states and 15881 transitions. [2021-11-20 22:50:18,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:18,688 INFO L276 IsEmpty]: Start isEmpty. Operand 12158 states and 15881 transitions. [2021-11-20 22:50:18,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2021-11-20 22:50:18,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:18,704 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:18,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-20 22:50:18,705 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:18,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:18,705 INFO L85 PathProgramCache]: Analyzing trace with hash -1211888839, now seen corresponding path program 1 times [2021-11-20 22:50:18,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:18,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035626383] [2021-11-20 22:50:18,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:18,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:18,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:18,842 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-20 22:50:18,842 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:18,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035626383] [2021-11-20 22:50:18,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1035626383] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:18,843 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:18,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:50:18,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558029549] [2021-11-20 22:50:18,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:18,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:18,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:18,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:18,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:18,845 INFO L87 Difference]: Start difference. First operand 12158 states and 15881 transitions. Second operand has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:19,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:19,874 INFO L93 Difference]: Finished difference Result 32754 states and 42881 transitions. [2021-11-20 22:50:19,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:19,874 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 211 [2021-11-20 22:50:19,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:19,914 INFO L225 Difference]: With dead ends: 32754 [2021-11-20 22:50:19,915 INFO L226 Difference]: Without dead ends: 20883 [2021-11-20 22:50:19,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:19,930 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 155 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 614 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:19,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 108 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 614 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 22:50:19,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20883 states. [2021-11-20 22:50:20,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20883 to 20881. [2021-11-20 22:50:20,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20881 states, 20880 states have (on average 1.2989463601532567) internal successors, (27122), 20880 states have internal predecessors, (27122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:20,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20881 states to 20881 states and 27122 transitions. [2021-11-20 22:50:20,450 INFO L78 Accepts]: Start accepts. Automaton has 20881 states and 27122 transitions. Word has length 211 [2021-11-20 22:50:20,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:20,450 INFO L470 AbstractCegarLoop]: Abstraction has 20881 states and 27122 transitions. [2021-11-20 22:50:20,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:20,450 INFO L276 IsEmpty]: Start isEmpty. Operand 20881 states and 27122 transitions. [2021-11-20 22:50:20,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-20 22:50:20,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:20,475 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:20,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 22:50:20,476 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:20,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:20,476 INFO L85 PathProgramCache]: Analyzing trace with hash -109257520, now seen corresponding path program 1 times [2021-11-20 22:50:20,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:20,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803914334] [2021-11-20 22:50:20,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:20,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:20,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:20,610 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 22:50:20,611 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:20,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803914334] [2021-11-20 22:50:20,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803914334] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:20,611 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:20,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 22:50:20,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927477114] [2021-11-20 22:50:20,612 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:20,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:50:20,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:20,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:50:20,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:50:20,613 INFO L87 Difference]: Start difference. First operand 20881 states and 27122 transitions. Second operand has 4 states, 4 states have (on average 47.0) internal successors, (188), 3 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:22,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:22,099 INFO L93 Difference]: Finished difference Result 41189 states and 53587 transitions. [2021-11-20 22:50:22,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 22:50:22,100 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 47.0) internal successors, (188), 3 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 213 [2021-11-20 22:50:22,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:22,141 INFO L225 Difference]: With dead ends: 41189 [2021-11-20 22:50:22,141 INFO L226 Difference]: Without dead ends: 20881 [2021-11-20 22:50:22,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:50:22,155 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 258 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 837 mSolverCounterSat, 247 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 258 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 1084 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 247 IncrementalHoareTripleChecker+Valid, 837 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:22,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [258 Valid, 98 Invalid, 1084 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [247 Valid, 837 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-20 22:50:22,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20881 states. [2021-11-20 22:50:22,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20881 to 20309. [2021-11-20 22:50:22,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20309 states, 20308 states have (on average 1.2989954697656096) internal successors, (26380), 20308 states have internal predecessors, (26380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:22,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20309 states to 20309 states and 26380 transitions. [2021-11-20 22:50:22,600 INFO L78 Accepts]: Start accepts. Automaton has 20309 states and 26380 transitions. Word has length 213 [2021-11-20 22:50:22,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:22,603 INFO L470 AbstractCegarLoop]: Abstraction has 20309 states and 26380 transitions. [2021-11-20 22:50:22,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 47.0) internal successors, (188), 3 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:22,603 INFO L276 IsEmpty]: Start isEmpty. Operand 20309 states and 26380 transitions. [2021-11-20 22:50:22,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2021-11-20 22:50:22,632 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:22,632 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:22,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-20 22:50:22,633 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:22,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:22,634 INFO L85 PathProgramCache]: Analyzing trace with hash 697190771, now seen corresponding path program 1 times [2021-11-20 22:50:22,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:22,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241208811] [2021-11-20 22:50:22,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:22,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:22,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:22,758 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 88 proven. 6 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-20 22:50:22,758 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:22,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241208811] [2021-11-20 22:50:22,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241208811] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:22,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242136283] [2021-11-20 22:50:22,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:22,759 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:22,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:22,760 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:22,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 22:50:22,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:22,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 536 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 22:50:22,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:23,427 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 121 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-20 22:50:23,427 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:50:23,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242136283] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:23,427 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:50:23,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-20 22:50:23,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873643227] [2021-11-20 22:50:23,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:23,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:23,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:23,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:23,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:23,430 INFO L87 Difference]: Start difference. First operand 20309 states and 26380 transitions. Second operand has 3 states, 3 states have (on average 67.66666666666667) internal successors, (203), 3 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:24,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:24,362 INFO L93 Difference]: Finished difference Result 41761 states and 54681 transitions. [2021-11-20 22:50:24,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:24,363 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 67.66666666666667) internal successors, (203), 3 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 220 [2021-11-20 22:50:24,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:24,411 INFO L225 Difference]: With dead ends: 41761 [2021-11-20 22:50:24,412 INFO L226 Difference]: Without dead ends: 21596 [2021-11-20 22:50:24,429 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 219 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:24,430 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 125 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:24,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 205 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 22:50:24,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21596 states. [2021-11-20 22:50:24,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21596 to 21596. [2021-11-20 22:50:24,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21596 states, 21595 states have (on average 1.2994211623060894) internal successors, (28061), 21595 states have internal predecessors, (28061), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:24,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21596 states to 21596 states and 28061 transitions. [2021-11-20 22:50:24,877 INFO L78 Accepts]: Start accepts. Automaton has 21596 states and 28061 transitions. Word has length 220 [2021-11-20 22:50:24,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:24,878 INFO L470 AbstractCegarLoop]: Abstraction has 21596 states and 28061 transitions. [2021-11-20 22:50:24,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 67.66666666666667) internal successors, (203), 3 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:24,878 INFO L276 IsEmpty]: Start isEmpty. Operand 21596 states and 28061 transitions. [2021-11-20 22:50:24,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-11-20 22:50:24,899 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:24,899 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:24,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:25,122 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:25,122 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:25,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:25,122 INFO L85 PathProgramCache]: Analyzing trace with hash -1498107534, now seen corresponding path program 1 times [2021-11-20 22:50:25,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:25,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920895814] [2021-11-20 22:50:25,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:25,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:25,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:25,220 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 101 proven. 6 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-20 22:50:25,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:25,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920895814] [2021-11-20 22:50:25,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [920895814] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:25,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1341041721] [2021-11-20 22:50:25,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:25,221 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:25,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:25,223 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:25,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 22:50:25,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:25,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 573 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 22:50:25,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:25,765 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 148 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-20 22:50:25,765 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:50:25,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1341041721] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:25,766 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:50:25,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-20 22:50:25,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270815045] [2021-11-20 22:50:25,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:25,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:25,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:25,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:25,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:25,768 INFO L87 Difference]: Start difference. First operand 21596 states and 28061 transitions. Second operand has 3 states, 3 states have (on average 68.66666666666667) internal successors, (206), 3 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:26,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:26,297 INFO L93 Difference]: Finished difference Result 46768 states and 61538 transitions. [2021-11-20 22:50:26,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:26,297 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 68.66666666666667) internal successors, (206), 3 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 228 [2021-11-20 22:50:26,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:26,361 INFO L225 Difference]: With dead ends: 46768 [2021-11-20 22:50:26,361 INFO L226 Difference]: Without dead ends: 33753 [2021-11-20 22:50:26,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 227 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:26,374 INFO L933 BasicCegarLoop]: 394 mSDtfsCounter, 208 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:26,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 555 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 22:50:26,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33753 states. [2021-11-20 22:50:26,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33753 to 33751. [2021-11-20 22:50:26,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33751 states, 33750 states have (on average 1.2871407407407407) internal successors, (43441), 33750 states have internal predecessors, (43441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:26,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33751 states to 33751 states and 43441 transitions. [2021-11-20 22:50:26,940 INFO L78 Accepts]: Start accepts. Automaton has 33751 states and 43441 transitions. Word has length 228 [2021-11-20 22:50:26,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:26,941 INFO L470 AbstractCegarLoop]: Abstraction has 33751 states and 43441 transitions. [2021-11-20 22:50:26,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 68.66666666666667) internal successors, (206), 3 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:26,941 INFO L276 IsEmpty]: Start isEmpty. Operand 33751 states and 43441 transitions. [2021-11-20 22:50:26,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-11-20 22:50:26,970 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:26,970 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:27,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:27,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:27,184 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:27,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:27,184 INFO L85 PathProgramCache]: Analyzing trace with hash 1649008240, now seen corresponding path program 1 times [2021-11-20 22:50:27,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:27,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828869704] [2021-11-20 22:50:27,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:27,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:27,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:27,372 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 82 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-20 22:50:27,372 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:27,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828869704] [2021-11-20 22:50:27,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1828869704] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:27,372 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:27,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:50:27,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021960943] [2021-11-20 22:50:27,375 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:27,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:27,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:27,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:27,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:27,378 INFO L87 Difference]: Start difference. First operand 33751 states and 43441 transitions. Second operand has 3 states, 3 states have (on average 73.33333333333333) internal successors, (220), 2 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:28,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:28,333 INFO L93 Difference]: Finished difference Result 66216 states and 85581 transitions. [2021-11-20 22:50:28,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:28,333 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 73.33333333333333) internal successors, (220), 2 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 228 [2021-11-20 22:50:28,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:28,381 INFO L225 Difference]: With dead ends: 66216 [2021-11-20 22:50:28,381 INFO L226 Difference]: Without dead ends: 41046 [2021-11-20 22:50:28,400 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:28,402 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 86 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 636 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 636 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:28,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 133 Invalid, 645 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 636 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 22:50:28,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41046 states. [2021-11-20 22:50:29,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41046 to 41044. [2021-11-20 22:50:29,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41044 states, 41043 states have (on average 1.2885023024632702) internal successors, (52884), 41043 states have internal predecessors, (52884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:29,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41044 states to 41044 states and 52884 transitions. [2021-11-20 22:50:29,215 INFO L78 Accepts]: Start accepts. Automaton has 41044 states and 52884 transitions. Word has length 228 [2021-11-20 22:50:29,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:29,215 INFO L470 AbstractCegarLoop]: Abstraction has 41044 states and 52884 transitions. [2021-11-20 22:50:29,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 73.33333333333333) internal successors, (220), 2 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:29,216 INFO L276 IsEmpty]: Start isEmpty. Operand 41044 states and 52884 transitions. [2021-11-20 22:50:29,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-11-20 22:50:29,243 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:29,243 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:29,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-20 22:50:29,244 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:29,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:29,244 INFO L85 PathProgramCache]: Analyzing trace with hash -511086605, now seen corresponding path program 1 times [2021-11-20 22:50:29,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:29,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711138545] [2021-11-20 22:50:29,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:29,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:29,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:29,379 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 99 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 22:50:29,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:29,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711138545] [2021-11-20 22:50:29,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711138545] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:29,380 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:29,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 22:50:29,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151783289] [2021-11-20 22:50:29,381 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:29,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 22:50:29,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:29,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 22:50:29,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:50:29,383 INFO L87 Difference]: Start difference. First operand 41044 states and 52884 transitions. Second operand has 4 states, 4 states have (on average 56.0) internal successors, (224), 3 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:30,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:30,564 INFO L93 Difference]: Finished difference Result 79513 states and 102687 transitions. [2021-11-20 22:50:30,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 22:50:30,566 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 56.0) internal successors, (224), 3 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 229 [2021-11-20 22:50:30,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:30,615 INFO L225 Difference]: With dead ends: 79513 [2021-11-20 22:50:30,616 INFO L226 Difference]: Without dead ends: 39185 [2021-11-20 22:50:30,631 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 22:50:30,632 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 331 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 648 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 331 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 857 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:30,632 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [331 Valid, 11 Invalid, 857 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 648 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 22:50:30,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39185 states. [2021-11-20 22:50:31,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39185 to 39185. [2021-11-20 22:50:31,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39185 states, 39184 states have (on average 1.2328501429154757) internal successors, (48308), 39184 states have internal predecessors, (48308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:31,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39185 states to 39185 states and 48308 transitions. [2021-11-20 22:50:31,280 INFO L78 Accepts]: Start accepts. Automaton has 39185 states and 48308 transitions. Word has length 229 [2021-11-20 22:50:31,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:31,281 INFO L470 AbstractCegarLoop]: Abstraction has 39185 states and 48308 transitions. [2021-11-20 22:50:31,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 56.0) internal successors, (224), 3 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:31,281 INFO L276 IsEmpty]: Start isEmpty. Operand 39185 states and 48308 transitions. [2021-11-20 22:50:31,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-11-20 22:50:31,295 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:31,296 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:31,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-20 22:50:31,296 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:31,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:31,297 INFO L85 PathProgramCache]: Analyzing trace with hash -817248172, now seen corresponding path program 1 times [2021-11-20 22:50:31,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:31,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871416848] [2021-11-20 22:50:31,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:31,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:31,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:31,381 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 98 proven. 0 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-20 22:50:31,381 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:31,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871416848] [2021-11-20 22:50:31,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871416848] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:31,381 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:31,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:50:31,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045150236] [2021-11-20 22:50:31,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:31,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:31,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:31,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:31,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:31,384 INFO L87 Difference]: Start difference. First operand 39185 states and 48308 transitions. Second operand has 3 states, 3 states have (on average 65.0) internal successors, (195), 2 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:32,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:32,350 INFO L93 Difference]: Finished difference Result 94101 states and 116068 transitions. [2021-11-20 22:50:32,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:32,350 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 65.0) internal successors, (195), 2 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 243 [2021-11-20 22:50:32,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:32,408 INFO L225 Difference]: With dead ends: 94101 [2021-11-20 22:50:32,408 INFO L226 Difference]: Without dead ends: 55775 [2021-11-20 22:50:32,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:32,434 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 131 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:32,435 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 110 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 22:50:32,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55775 states. [2021-11-20 22:50:33,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55775 to 55773. [2021-11-20 22:50:33,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55773 states, 55772 states have (on average 1.2273721580721508) internal successors, (68453), 55772 states have internal predecessors, (68453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:33,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55773 states to 55773 states and 68453 transitions. [2021-11-20 22:50:33,412 INFO L78 Accepts]: Start accepts. Automaton has 55773 states and 68453 transitions. Word has length 243 [2021-11-20 22:50:33,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:33,412 INFO L470 AbstractCegarLoop]: Abstraction has 55773 states and 68453 transitions. [2021-11-20 22:50:33,413 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 65.0) internal successors, (195), 2 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:33,414 INFO L276 IsEmpty]: Start isEmpty. Operand 55773 states and 68453 transitions. [2021-11-20 22:50:33,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-11-20 22:50:33,446 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:33,447 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:33,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-20 22:50:33,447 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:33,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:33,448 INFO L85 PathProgramCache]: Analyzing trace with hash 1061541960, now seen corresponding path program 1 times [2021-11-20 22:50:33,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:33,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556876031] [2021-11-20 22:50:33,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:33,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:33,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:33,581 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 108 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 22:50:33,581 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:33,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556876031] [2021-11-20 22:50:33,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556876031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:33,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1136424503] [2021-11-20 22:50:33,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:33,582 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:33,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:33,587 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:33,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 22:50:33,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:33,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 22:50:33,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:34,442 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-20 22:50:34,442 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:50:34,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1136424503] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:34,442 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:50:34,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-20 22:50:34,443 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980721782] [2021-11-20 22:50:34,444 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:34,448 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:34,448 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:34,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:34,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:34,449 INFO L87 Difference]: Start difference. First operand 55773 states and 68453 transitions. Second operand has 3 states, 3 states have (on average 80.33333333333333) internal successors, (241), 3 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:35,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:35,481 INFO L93 Difference]: Finished difference Result 121555 states and 151279 transitions. [2021-11-20 22:50:35,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:35,482 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 80.33333333333333) internal successors, (241), 3 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 249 [2021-11-20 22:50:35,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:35,559 INFO L225 Difference]: With dead ends: 121555 [2021-11-20 22:50:35,559 INFO L226 Difference]: Without dead ends: 69787 [2021-11-20 22:50:35,752 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:35,753 INFO L933 BasicCegarLoop]: 228 mSDtfsCounter, 20 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 521 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:35,753 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 232 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 521 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 22:50:35,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69787 states. [2021-11-20 22:50:36,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69787 to 67785. [2021-11-20 22:50:36,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67785 states, 67784 states have (on average 1.2413843974979346) internal successors, (84146), 67784 states have internal predecessors, (84146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:36,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67785 states to 67785 states and 84146 transitions. [2021-11-20 22:50:36,741 INFO L78 Accepts]: Start accepts. Automaton has 67785 states and 84146 transitions. Word has length 249 [2021-11-20 22:50:36,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:36,742 INFO L470 AbstractCegarLoop]: Abstraction has 67785 states and 84146 transitions. [2021-11-20 22:50:36,742 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 80.33333333333333) internal successors, (241), 3 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:36,742 INFO L276 IsEmpty]: Start isEmpty. Operand 67785 states and 84146 transitions. [2021-11-20 22:50:36,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-11-20 22:50:36,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:36,772 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:36,811 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:36,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 22:50:36,999 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:37,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:37,000 INFO L85 PathProgramCache]: Analyzing trace with hash 1601074587, now seen corresponding path program 1 times [2021-11-20 22:50:37,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:37,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620555962] [2021-11-20 22:50:37,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:37,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:37,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:37,093 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 110 proven. 6 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-20 22:50:37,093 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:37,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620555962] [2021-11-20 22:50:37,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620555962] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:37,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831402620] [2021-11-20 22:50:37,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:37,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:37,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:37,095 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:37,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 22:50:37,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:37,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 22:50:37,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:37,719 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 157 proven. 0 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-20 22:50:37,719 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:50:37,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831402620] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:37,719 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:50:37,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-20 22:50:37,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632407406] [2021-11-20 22:50:37,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:37,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:37,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:37,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:37,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:37,722 INFO L87 Difference]: Start difference. First operand 67785 states and 84146 transitions. Second operand has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:38,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:38,906 INFO L93 Difference]: Finished difference Result 147724 states and 184397 transitions. [2021-11-20 22:50:38,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:38,907 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 265 [2021-11-20 22:50:38,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:38,990 INFO L225 Difference]: With dead ends: 147724 [2021-11-20 22:50:38,990 INFO L226 Difference]: Without dead ends: 80798 [2021-11-20 22:50:39,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 264 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:39,018 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 33 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:39,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 68 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 22:50:39,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80798 states. [2021-11-20 22:50:40,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80798 to 72790. [2021-11-20 22:50:40,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72790 states, 72789 states have (on average 1.2313399002596546) internal successors, (89628), 72789 states have internal predecessors, (89628), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:40,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72790 states to 72790 states and 89628 transitions. [2021-11-20 22:50:40,468 INFO L78 Accepts]: Start accepts. Automaton has 72790 states and 89628 transitions. Word has length 265 [2021-11-20 22:50:40,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:40,483 INFO L470 AbstractCegarLoop]: Abstraction has 72790 states and 89628 transitions. [2021-11-20 22:50:40,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:40,484 INFO L276 IsEmpty]: Start isEmpty. Operand 72790 states and 89628 transitions. [2021-11-20 22:50:40,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-20 22:50:40,544 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:40,544 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:40,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:40,747 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 22:50:40,748 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:40,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:40,749 INFO L85 PathProgramCache]: Analyzing trace with hash 1722522458, now seen corresponding path program 1 times [2021-11-20 22:50:40,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:40,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203109703] [2021-11-20 22:50:40,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:40,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:40,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:40,846 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 147 proven. 6 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2021-11-20 22:50:40,847 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:40,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203109703] [2021-11-20 22:50:40,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203109703] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:40,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221114774] [2021-11-20 22:50:40,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:40,848 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:40,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:40,860 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:40,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 22:50:41,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:41,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 22:50:41,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:41,482 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 272 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-20 22:50:41,482 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:50:41,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221114774] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:41,483 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:50:41,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-20 22:50:41,483 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963644057] [2021-11-20 22:50:41,483 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:41,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:41,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:41,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:41,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:41,485 INFO L87 Difference]: Start difference. First operand 72790 states and 89628 transitions. Second operand has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:42,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:42,666 INFO L93 Difference]: Finished difference Result 134854 states and 167188 transitions. [2021-11-20 22:50:42,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:42,666 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 306 [2021-11-20 22:50:42,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:42,719 INFO L225 Difference]: With dead ends: 134854 [2021-11-20 22:50:42,719 INFO L226 Difference]: Without dead ends: 58347 [2021-11-20 22:50:42,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 305 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 22:50:42,731 INFO L933 BasicCegarLoop]: 248 mSDtfsCounter, 93 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:42,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 251 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 22:50:42,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58347 states. [2021-11-20 22:50:43,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58347 to 48766. [2021-11-20 22:50:43,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48766 states, 48765 states have (on average 1.1375986875833077) internal successors, (55475), 48765 states have internal predecessors, (55475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:43,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48766 states to 48766 states and 55475 transitions. [2021-11-20 22:50:43,502 INFO L78 Accepts]: Start accepts. Automaton has 48766 states and 55475 transitions. Word has length 306 [2021-11-20 22:50:43,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:43,503 INFO L470 AbstractCegarLoop]: Abstraction has 48766 states and 55475 transitions. [2021-11-20 22:50:43,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:43,503 INFO L276 IsEmpty]: Start isEmpty. Operand 48766 states and 55475 transitions. [2021-11-20 22:50:43,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2021-11-20 22:50:43,525 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:43,526 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:43,547 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-20 22:50:43,726 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 22:50:43,727 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:43,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:43,727 INFO L85 PathProgramCache]: Analyzing trace with hash -142547820, now seen corresponding path program 1 times [2021-11-20 22:50:43,727 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:43,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373256190] [2021-11-20 22:50:43,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:43,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:43,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:43,887 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 176 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-20 22:50:43,888 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:43,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373256190] [2021-11-20 22:50:43,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373256190] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:43,888 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:50:43,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:50:43,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875780549] [2021-11-20 22:50:43,889 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:43,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:43,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:43,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:43,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:43,892 INFO L87 Difference]: Start difference. First operand 48766 states and 55475 transitions. Second operand has 3 states, 3 states have (on average 86.66666666666667) internal successors, (260), 2 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:44,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:44,700 INFO L93 Difference]: Finished difference Result 111974 states and 127445 transitions. [2021-11-20 22:50:44,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:44,700 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 86.66666666666667) internal successors, (260), 2 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 322 [2021-11-20 22:50:44,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:44,762 INFO L225 Difference]: With dead ends: 111974 [2021-11-20 22:50:44,762 INFO L226 Difference]: Without dead ends: 65211 [2021-11-20 22:50:44,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:50:44,788 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 41 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 434 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:44,788 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 44 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 434 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 22:50:44,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65211 states. [2021-11-20 22:50:45,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65211 to 63638. [2021-11-20 22:50:45,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63638 states, 63637 states have (on average 1.1378600499709288) internal successors, (72410), 63637 states have internal predecessors, (72410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:45,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63638 states to 63638 states and 72410 transitions. [2021-11-20 22:50:45,862 INFO L78 Accepts]: Start accepts. Automaton has 63638 states and 72410 transitions. Word has length 322 [2021-11-20 22:50:45,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:45,863 INFO L470 AbstractCegarLoop]: Abstraction has 63638 states and 72410 transitions. [2021-11-20 22:50:45,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 86.66666666666667) internal successors, (260), 2 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:45,863 INFO L276 IsEmpty]: Start isEmpty. Operand 63638 states and 72410 transitions. [2021-11-20 22:50:45,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2021-11-20 22:50:45,890 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:45,890 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:45,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-20 22:50:45,890 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:45,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:45,891 INFO L85 PathProgramCache]: Analyzing trace with hash 848149713, now seen corresponding path program 1 times [2021-11-20 22:50:45,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:45,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347265721] [2021-11-20 22:50:45,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:45,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:45,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:46,565 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 197 proven. 6 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-20 22:50:46,565 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:46,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347265721] [2021-11-20 22:50:46,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347265721] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:46,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646900387] [2021-11-20 22:50:46,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:46,566 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:46,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:46,571 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:46,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 22:50:46,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:46,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 22:50:46,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:47,283 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 261 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-20 22:50:47,284 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 22:50:47,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646900387] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:50:47,284 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 22:50:47,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-20 22:50:47,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893451972] [2021-11-20 22:50:47,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:50:47,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:50:47,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:50:47,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:50:47,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 22:50:47,286 INFO L87 Difference]: Start difference. First operand 63638 states and 72410 transitions. Second operand has 3 states, 3 states have (on average 98.33333333333333) internal successors, (295), 3 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:48,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:50:48,144 INFO L93 Difference]: Finished difference Result 116264 states and 132367 transitions. [2021-11-20 22:50:48,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:50:48,145 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 98.33333333333333) internal successors, (295), 3 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 329 [2021-11-20 22:50:48,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:50:48,196 INFO L225 Difference]: With dead ends: 116264 [2021-11-20 22:50:48,196 INFO L226 Difference]: Without dead ends: 53628 [2021-11-20 22:50:48,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 328 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 22:50:48,219 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 120 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 22:50:48,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 211 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 22:50:48,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53628 states. [2021-11-20 22:50:48,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53628 to 52627. [2021-11-20 22:50:49,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52627 states, 52626 states have (on average 1.1340212062478623) internal successors, (59679), 52626 states have internal predecessors, (59679), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:49,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52627 states to 52627 states and 59679 transitions. [2021-11-20 22:50:49,081 INFO L78 Accepts]: Start accepts. Automaton has 52627 states and 59679 transitions. Word has length 329 [2021-11-20 22:50:49,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:50:49,081 INFO L470 AbstractCegarLoop]: Abstraction has 52627 states and 59679 transitions. [2021-11-20 22:50:49,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 98.33333333333333) internal successors, (295), 3 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:50:49,082 INFO L276 IsEmpty]: Start isEmpty. Operand 52627 states and 59679 transitions. [2021-11-20 22:50:49,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 380 [2021-11-20 22:50:49,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:50:49,110 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:50:49,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 22:50:49,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:49,311 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:50:49,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:50:49,312 INFO L85 PathProgramCache]: Analyzing trace with hash 2144683303, now seen corresponding path program 1 times [2021-11-20 22:50:49,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:50:49,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030611692] [2021-11-20 22:50:49,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:49,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:50:49,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:49,434 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 147 proven. 6 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2021-11-20 22:50:49,435 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:50:49,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030611692] [2021-11-20 22:50:49,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030611692] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:50:49,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123937033] [2021-11-20 22:50:49,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:50:49,436 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:50:49,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:50:49,437 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:50:49,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_220d7637-8a94-40fd-9049-a68855d079b6/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 22:50:49,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:50:49,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 707 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 22:50:49,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:50:50,448 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 301 proven. 71 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-20 22:50:50,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:50:51,451 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 301 proven. 71 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-20 22:50:51,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1123937033] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:50:51,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1115464863] [2021-11-20 22:50:51,477 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-20 22:50:51,477 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:50:51,482 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:50:51,488 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:50:51,489 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs