./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem15_label53.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem15_label53.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl --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 d47a87af871ac94bbcea7d3dd980f2dd1a9893e716b88333a075adbedab63554 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:00:55,259 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:00:55,263 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:00:55,316 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:00:55,317 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:00:55,318 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:00:55,320 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:00:55,322 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:00:55,324 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:00:55,325 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:00:55,327 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:00:55,328 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:00:55,329 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:00:55,330 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:00:55,332 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:00:55,333 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:00:55,334 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:00:55,335 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:00:55,337 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:00:55,340 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:00:55,342 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:00:55,344 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:00:55,345 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:00:55,346 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:00:55,350 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:00:55,351 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:00:55,351 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:00:55,353 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:00:55,353 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:00:55,355 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:00:55,355 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:00:55,356 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:00:55,357 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:00:55,358 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:00:55,359 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:00:55,360 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:00:55,360 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:00:55,361 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:00:55,361 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:00:55,362 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:00:55,363 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:00:55,363 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:00:55,389 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:00:55,389 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:00:55,389 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:00:55,390 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:00:55,390 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:00:55,390 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:00:55,391 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:00:55,391 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:00:55,391 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:00:55,391 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:00:55,392 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:00:55,392 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:00:55,392 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:00:55,392 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:00:55,393 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:00:55,393 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:00:55,393 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:00:55,393 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:00:55,394 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:00:55,394 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:00:55,395 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:00:55,395 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:00:55,395 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:00:55,395 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:00:55,395 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:00:55,396 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:00:55,396 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:00:55,396 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:00:55,396 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:00:55,397 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:00:55,397 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:00:55,397 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:00:55,397 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:00:55,398 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:00:55,398 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:00:55,398 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:00:55,398 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:00:55,399 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:00:55,399 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:00:55,399 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:00:55,399 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:00:55,399 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_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d47a87af871ac94bbcea7d3dd980f2dd1a9893e716b88333a075adbedab63554 [2021-11-23 17:00:55,651 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:00:55,692 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:00:55,694 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:00:55,695 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:00:55,696 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:00:55,697 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem15_label53.c [2021-11-23 17:00:55,817 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/data/c9bcd2197/6b7170954ba9488cb74970d9f4690fe2/FLAG2bdf3de15 [2021-11-23 17:00:56,526 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:00:56,528 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/sv-benchmarks/c/eca-rers2012/Problem15_label53.c [2021-11-23 17:00:56,557 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/data/c9bcd2197/6b7170954ba9488cb74970d9f4690fe2/FLAG2bdf3de15 [2021-11-23 17:00:56,686 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/data/c9bcd2197/6b7170954ba9488cb74970d9f4690fe2 [2021-11-23 17:00:56,690 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:00:56,693 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:00:56,695 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:00:56,695 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:00:56,699 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:00:56,699 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:00:56" (1/1) ... [2021-11-23 17:00:56,702 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e8ff1e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:56, skipping insertion in model container [2021-11-23 17:00:56,703 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:00:56" (1/1) ... [2021-11-23 17:00:56,712 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:00:56,819 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:00:57,168 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_d566ee73-c44a-4791-b967-bff177dae332/sv-benchmarks/c/eca-rers2012/Problem15_label53.c[5826,5839] [2021-11-23 17:00:57,701 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:00:57,710 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:00:57,758 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_d566ee73-c44a-4791-b967-bff177dae332/sv-benchmarks/c/eca-rers2012/Problem15_label53.c[5826,5839] [2021-11-23 17:00:58,159 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:00:58,176 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:00:58,176 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:58 WrapperNode [2021-11-23 17:00:58,176 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:00:58,177 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:00:58,178 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:00:58,178 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:00:58,185 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:58" (1/1) ... [2021-11-23 17:00:58,229 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:58" (1/1) ... [2021-11-23 17:00:58,438 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1758 [2021-11-23 17:00:58,438 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:00:58,439 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:00:58,439 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:00:58,439 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:00:58,448 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:58" (1/1) ... [2021-11-23 17:00:58,449 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:58" (1/1) ... [2021-11-23 17:00:58,470 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:58" (1/1) ... [2021-11-23 17:00:58,471 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:58" (1/1) ... [2021-11-23 17:00:58,582 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:58" (1/1) ... [2021-11-23 17:00:58,608 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:58" (1/1) ... [2021-11-23 17:00:58,645 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:58" (1/1) ... [2021-11-23 17:00:58,687 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:00:58,688 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:00:58,689 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:00:58,689 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:00:58,693 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:00:58" (1/1) ... [2021-11-23 17:00:58,701 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:00:58,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:58,764 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:00:58,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:00:58,825 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:00:58,825 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:00:58,825 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:00:58,825 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:00:58,900 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:00:58,902 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:01:01,982 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:01:02,036 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:01:02,041 INFO L158 Benchmark]: Toolchain (without parser) took 5346.45ms. Allocated memory was 121.6MB in the beginning and 285.2MB in the end (delta: 163.6MB). Free memory was 82.7MB in the beginning and 156.2MB in the end (delta: -73.5MB). Peak memory consumption was 91.6MB. Max. memory is 16.1GB. [2021-11-23 17:01:02,042 INFO L158 Benchmark]: CDTParser took 0.14ms. Allocated memory is still 81.8MB. Free memory was 38.3MB in the beginning and 38.2MB in the end (delta: 77.1kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:01:02,043 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1481.98ms. Allocated memory is still 121.6MB. Free memory was 82.5MB in the beginning and 80.5MB in the end (delta: 2.0MB). Peak memory consumption was 51.0MB. Max. memory is 16.1GB. [2021-11-23 17:01:02,044 INFO L158 Benchmark]: Boogie Procedure Inliner took 260.87ms. Allocated memory was 121.6MB in the beginning and 165.7MB in the end (delta: 44.0MB). Free memory was 80.5MB in the beginning and 111.2MB in the end (delta: -30.7MB). Peak memory consumption was 57.3MB. Max. memory is 16.1GB. [2021-11-23 17:01:02,045 INFO L158 Benchmark]: Boogie Preprocessor took 248.05ms. Allocated memory is still 165.7MB. Free memory was 111.2MB in the beginning and 92.9MB in the end (delta: 18.3MB). Peak memory consumption was 18.9MB. Max. memory is 16.1GB. [2021-11-23 17:01:02,046 INFO L158 Benchmark]: RCFGBuilder took 3350.36ms. Allocated memory was 165.7MB in the beginning and 285.2MB in the end (delta: 119.5MB). Free memory was 92.9MB in the beginning and 156.2MB in the end (delta: -63.3MB). Peak memory consumption was 58.8MB. Max. memory is 16.1GB. [2021-11-23 17:01:02,050 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14ms. Allocated memory is still 81.8MB. Free memory was 38.3MB in the beginning and 38.2MB in the end (delta: 77.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1481.98ms. Allocated memory is still 121.6MB. Free memory was 82.5MB in the beginning and 80.5MB in the end (delta: 2.0MB). Peak memory consumption was 51.0MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 260.87ms. Allocated memory was 121.6MB in the beginning and 165.7MB in the end (delta: 44.0MB). Free memory was 80.5MB in the beginning and 111.2MB in the end (delta: -30.7MB). Peak memory consumption was 57.3MB. Max. memory is 16.1GB. * Boogie Preprocessor took 248.05ms. Allocated memory is still 165.7MB. Free memory was 111.2MB in the beginning and 92.9MB in the end (delta: 18.3MB). Peak memory consumption was 18.9MB. Max. memory is 16.1GB. * RCFGBuilder took 3350.36ms. Allocated memory was 165.7MB in the beginning and 285.2MB in the end (delta: 119.5MB). Free memory was 92.9MB in the beginning and 156.2MB in the end (delta: -63.3MB). Peak memory consumption was 58.8MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:01:02,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem15_label53.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl --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 d47a87af871ac94bbcea7d3dd980f2dd1a9893e716b88333a075adbedab63554 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:01:04,652 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:01:04,655 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:01:04,688 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:01:04,689 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:01:04,691 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:01:04,692 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:01:04,695 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:01:04,697 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:01:04,699 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:01:04,700 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:01:04,701 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:01:04,702 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:01:04,703 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:01:04,709 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:01:04,710 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:01:04,711 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:01:04,713 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:01:04,715 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:01:04,717 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:01:04,719 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:01:04,723 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:01:04,727 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:01:04,729 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:01:04,741 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:01:04,741 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:01:04,742 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:01:04,749 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:01:04,750 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:01:04,751 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:01:04,752 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:01:04,753 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:01:04,754 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:01:04,755 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:01:04,756 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:01:04,756 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:01:04,757 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:01:04,758 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:01:04,758 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:01:04,759 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:01:04,765 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:01:04,766 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:01:04,816 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:01:04,817 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:01:04,817 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:01:04,818 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:01:04,818 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:01:04,819 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:01:04,819 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:01:04,819 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:01:04,819 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:01:04,820 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:01:04,821 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:01:04,821 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:01:04,822 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:01:04,823 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:01:04,823 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:01:04,823 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:01:04,823 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:01:04,823 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:01:04,824 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:01:04,824 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:01:04,824 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:01:04,824 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:01:04,824 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:01:04,825 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:01:04,825 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:01:04,825 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:01:04,825 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:01:04,826 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:01:04,826 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:01:04,826 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:01:04,826 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:01:04,826 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:01:04,827 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:01:04,827 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:01:04,827 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:01:04,828 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:01:04,828 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:01:04,828 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:01:04,828 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d47a87af871ac94bbcea7d3dd980f2dd1a9893e716b88333a075adbedab63554 [2021-11-23 17:01:05,257 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:01:05,287 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:01:05,292 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:01:05,294 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:01:05,295 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:01:05,297 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem15_label53.c [2021-11-23 17:01:05,400 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/data/fd5dda29e/e4abb131e8264bfca93c9e511296dbd4/FLAG988728775 [2021-11-23 17:01:06,282 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:01:06,284 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/sv-benchmarks/c/eca-rers2012/Problem15_label53.c [2021-11-23 17:01:06,305 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/data/fd5dda29e/e4abb131e8264bfca93c9e511296dbd4/FLAG988728775 [2021-11-23 17:01:06,372 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/data/fd5dda29e/e4abb131e8264bfca93c9e511296dbd4 [2021-11-23 17:01:06,377 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:01:06,379 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:01:06,383 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:01:06,383 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:01:06,387 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:01:06,389 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:01:06" (1/1) ... [2021-11-23 17:01:06,391 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54a839b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:06, skipping insertion in model container [2021-11-23 17:01:06,392 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:01:06" (1/1) ... [2021-11-23 17:01:06,399 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:01:06,496 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:01:06,829 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_d566ee73-c44a-4791-b967-bff177dae332/sv-benchmarks/c/eca-rers2012/Problem15_label53.c[5826,5839] [2021-11-23 17:01:07,521 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:01:07,536 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:01:07,583 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_d566ee73-c44a-4791-b967-bff177dae332/sv-benchmarks/c/eca-rers2012/Problem15_label53.c[5826,5839] [2021-11-23 17:01:07,964 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:01:07,984 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:01:07,985 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07 WrapperNode [2021-11-23 17:01:07,985 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:01:07,986 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:01:07,986 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:01:07,987 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:01:07,994 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07" (1/1) ... [2021-11-23 17:01:08,069 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07" (1/1) ... [2021-11-23 17:01:08,207 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1755 [2021-11-23 17:01:08,207 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:01:08,208 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:01:08,209 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:01:08,209 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:01:08,219 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07" (1/1) ... [2021-11-23 17:01:08,220 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07" (1/1) ... [2021-11-23 17:01:08,232 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07" (1/1) ... [2021-11-23 17:01:08,232 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07" (1/1) ... [2021-11-23 17:01:08,310 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07" (1/1) ... [2021-11-23 17:01:08,341 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07" (1/1) ... [2021-11-23 17:01:08,366 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07" (1/1) ... [2021-11-23 17:01:08,383 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:01:08,385 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:01:08,386 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:01:08,386 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:01:08,390 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07" (1/1) ... [2021-11-23 17:01:08,398 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:01:08,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:01:08,425 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:01:08,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:01:08,479 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:01:08,480 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:01:08,480 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:01:08,480 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:01:08,572 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:01:08,574 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:01:27,113 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:01:27,133 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:01:27,133 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:01:27,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:01:27 BoogieIcfgContainer [2021-11-23 17:01:27,137 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:01:27,140 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:01:27,140 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:01:27,143 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:01:27,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:01:06" (1/3) ... [2021-11-23 17:01:27,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@425317e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:01:27, skipping insertion in model container [2021-11-23 17:01:27,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:01:07" (2/3) ... [2021-11-23 17:01:27,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@425317e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:01:27, skipping insertion in model container [2021-11-23 17:01:27,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:01:27" (3/3) ... [2021-11-23 17:01:27,147 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem15_label53.c [2021-11-23 17:01:27,154 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:01:27,154 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:01:27,213 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:01:27,221 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 [2021-11-23 17:01:27,221 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:01:27,252 INFO L276 IsEmpty]: Start isEmpty. Operand has 424 states, 422 states have (on average 1.7772511848341233) internal successors, (750), 423 states have internal predecessors, (750), 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) [2021-11-23 17:01:27,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 17:01:27,261 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:27,262 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] [2021-11-23 17:01:27,263 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:27,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:27,269 INFO L85 PathProgramCache]: Analyzing trace with hash 433832817, now seen corresponding path program 1 times [2021-11-23 17:01:27,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:27,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2003663424] [2021-11-23 17:01:27,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:27,286 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:27,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:27,287 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:27,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:01:27,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:27,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:01:27,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:27,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:27,825 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:27,826 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:27,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2003663424] [2021-11-23 17:01:27,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2003663424] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:27,827 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:27,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:01:27,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191126847] [2021-11-23 17:01:27,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:27,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:01:27,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:27,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:01:27,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:01:27,874 INFO L87 Difference]: Start difference. First operand has 424 states, 422 states have (on average 1.7772511848341233) internal successors, (750), 423 states have internal predecessors, (750), 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 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 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) [2021-11-23 17:01:49,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:49,057 INFO L93 Difference]: Finished difference Result 1179 states and 2143 transitions. [2021-11-23 17:01:49,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:01:49,060 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 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 47 [2021-11-23 17:01:49,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:49,084 INFO L225 Difference]: With dead ends: 1179 [2021-11-23 17:01:49,084 INFO L226 Difference]: Without dead ends: 676 [2021-11-23 17:01:49,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:01:49,094 INFO L933 BasicCegarLoop]: 236 mSDtfsCounter, 292 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 1097 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 292 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 1262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 1097 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:49,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [292 Valid, 277 Invalid, 1262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 1097 Invalid, 0 Unknown, 0 Unchecked, 21.1s Time] [2021-11-23 17:01:49,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 676 states. [2021-11-23 17:01:49,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 676 to 668. [2021-11-23 17:01:49,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 667 states have (on average 1.5772113943028485) internal successors, (1052), 667 states have internal predecessors, (1052), 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) [2021-11-23 17:01:49,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 1052 transitions. [2021-11-23 17:01:49,187 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 1052 transitions. Word has length 47 [2021-11-23 17:01:49,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:49,188 INFO L470 AbstractCegarLoop]: Abstraction has 668 states and 1052 transitions. [2021-11-23 17:01:49,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 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) [2021-11-23 17:01:49,188 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 1052 transitions. [2021-11-23 17:01:49,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 17:01:49,194 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:49,195 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, 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] [2021-11-23 17:01:49,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:49,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:01:49,406 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:49,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:49,407 INFO L85 PathProgramCache]: Analyzing trace with hash -2052940708, now seen corresponding path program 1 times [2021-11-23 17:01:49,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:49,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1245593154] [2021-11-23 17:01:49,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:49,411 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:49,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:49,412 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:49,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:01:49,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:49,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:01:49,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:49,987 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:49,988 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:01:49,988 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:49,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1245593154] [2021-11-23 17:01:49,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1245593154] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:01:49,989 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:01:49,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:01:49,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305727355] [2021-11-23 17:01:49,989 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:01:49,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:01:49,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:49,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:01:49,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:01:49,992 INFO L87 Difference]: Start difference. First operand 668 states and 1052 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2021-11-23 17:02:15,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:15,096 INFO L93 Difference]: Finished difference Result 1630 states and 2635 transitions. [2021-11-23 17:02:15,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:02:15,113 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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 113 [2021-11-23 17:02:15,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:15,120 INFO L225 Difference]: With dead ends: 1630 [2021-11-23 17:02:15,121 INFO L226 Difference]: Without dead ends: 964 [2021-11-23 17:02:15,126 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:02:15,128 INFO L933 BasicCegarLoop]: 301 mSDtfsCounter, 248 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 953 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 1133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 953 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:15,129 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 347 Invalid, 1133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 953 Invalid, 0 Unknown, 0 Unchecked, 25.0s Time] [2021-11-23 17:02:15,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 964 states. [2021-11-23 17:02:15,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 964 to 962. [2021-11-23 17:02:15,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 962 states, 961 states have (on average 1.3631633714880333) internal successors, (1310), 961 states have internal predecessors, (1310), 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) [2021-11-23 17:02:15,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 962 states to 962 states and 1310 transitions. [2021-11-23 17:02:15,179 INFO L78 Accepts]: Start accepts. Automaton has 962 states and 1310 transitions. Word has length 113 [2021-11-23 17:02:15,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:15,180 INFO L470 AbstractCegarLoop]: Abstraction has 962 states and 1310 transitions. [2021-11-23 17:02:15,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2021-11-23 17:02:15,181 INFO L276 IsEmpty]: Start isEmpty. Operand 962 states and 1310 transitions. [2021-11-23 17:02:15,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 17:02:15,183 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:15,184 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, 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] [2021-11-23 17:02:15,204 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-23 17:02:15,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:15,396 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:15,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:15,397 INFO L85 PathProgramCache]: Analyzing trace with hash 2089662630, now seen corresponding path program 1 times [2021-11-23 17:02:15,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:15,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [156929505] [2021-11-23 17:02:15,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:15,400 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:15,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:15,401 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:15,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:02:15,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:15,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:02:15,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:16,002 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:02:16,002 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:16,003 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:16,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [156929505] [2021-11-23 17:02:16,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [156929505] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:16,004 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:02:16,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:02:16,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83224800] [2021-11-23 17:02:16,004 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:16,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:02:16,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:16,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:02:16,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:02:16,006 INFO L87 Difference]: Start difference. First operand 962 states and 1310 transitions. Second operand has 3 states, 3 states have (on average 39.0) internal successors, (117), 2 states have internal predecessors, (117), 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) [2021-11-23 17:02:39,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:39,517 INFO L93 Difference]: Finished difference Result 1928 states and 2831 transitions. [2021-11-23 17:02:39,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:02:39,517 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.0) internal successors, (117), 2 states have internal predecessors, (117), 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 117 [2021-11-23 17:02:39,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:39,527 INFO L225 Difference]: With dead ends: 1928 [2021-11-23 17:02:39,527 INFO L226 Difference]: Without dead ends: 1267 [2021-11-23 17:02:39,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:02:39,531 INFO L933 BasicCegarLoop]: 279 mSDtfsCounter, 256 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 839 mSolverCounterSat, 285 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 1124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 285 IncrementalHoareTripleChecker+Valid, 839 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:39,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 318 Invalid, 1124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [285 Valid, 839 Invalid, 0 Unknown, 0 Unchecked, 23.4s Time] [2021-11-23 17:02:39,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1267 states. [2021-11-23 17:02:39,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1267 to 1265. [2021-11-23 17:02:39,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1265 states, 1264 states have (on average 1.3045886075949367) internal successors, (1649), 1264 states have internal predecessors, (1649), 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) [2021-11-23 17:02:39,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1265 states to 1265 states and 1649 transitions. [2021-11-23 17:02:39,576 INFO L78 Accepts]: Start accepts. Automaton has 1265 states and 1649 transitions. Word has length 117 [2021-11-23 17:02:39,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:39,577 INFO L470 AbstractCegarLoop]: Abstraction has 1265 states and 1649 transitions. [2021-11-23 17:02:39,577 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.0) internal successors, (117), 2 states have internal predecessors, (117), 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) [2021-11-23 17:02:39,577 INFO L276 IsEmpty]: Start isEmpty. Operand 1265 states and 1649 transitions. [2021-11-23 17:02:39,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-23 17:02:39,584 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:39,584 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, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:02:39,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:39,797 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:39,797 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:39,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:39,798 INFO L85 PathProgramCache]: Analyzing trace with hash 864549314, now seen corresponding path program 1 times [2021-11-23 17:02:39,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:39,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [849220650] [2021-11-23 17:02:39,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:39,801 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:39,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:39,802 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:39,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:02:39,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:39,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:02:39,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:43,116 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:02:43,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:46,063 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:02:46,064 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:46,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [849220650] [2021-11-23 17:02:46,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [849220650] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:46,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [623089602] [2021-11-23 17:02:46,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:46,066 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:46,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:46,080 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:46,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-23 17:02:46,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:46,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:02:46,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:49,390 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 155 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:02:49,390 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:02:49,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [623089602] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:02:49,391 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:02:49,391 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3] total 11 [2021-11-23 17:02:49,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845208794] [2021-11-23 17:02:49,392 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:02:49,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:02:49,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:02:49,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:02:49,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:02:49,394 INFO L87 Difference]: Start difference. First operand 1265 states and 1649 transitions. Second operand has 7 states, 7 states have (on average 29.428571428571427) internal successors, (206), 7 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) [2021-11-23 17:03:04,627 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:03:13,810 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.38s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:03:15,657 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:03:22,444 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.99s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:03:27,206 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.62s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:03:29,179 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:03:41,817 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:03:50,656 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:03:52,663 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:03:59,317 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.41s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:04:00,595 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.28s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:04:01,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:01,444 INFO L93 Difference]: Finished difference Result 1976 states and 2648 transitions. [2021-11-23 17:04:01,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:04:01,463 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 29.428571428571427) internal successors, (206), 7 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 213 [2021-11-23 17:04:01,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:01,478 INFO L225 Difference]: With dead ends: 1976 [2021-11-23 17:04:01,478 INFO L226 Difference]: Without dead ends: 1974 [2021-11-23 17:04:01,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 627 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:04:01,480 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 2605 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 1039 mSolverCounterSat, 1517 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 67.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2605 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 2556 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1517 IncrementalHoareTripleChecker+Valid, 1039 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 71.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:01,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2605 Valid, 92 Invalid, 2556 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1517 Valid, 1039 Invalid, 0 Unknown, 0 Unchecked, 71.9s Time] [2021-11-23 17:04:01,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1974 states. [2021-11-23 17:04:01,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1974 to 1574. [2021-11-23 17:04:01,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1574 states, 1573 states have (on average 1.3935155753337571) internal successors, (2192), 1573 states have internal predecessors, (2192), 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) [2021-11-23 17:04:01,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1574 states to 1574 states and 2192 transitions. [2021-11-23 17:04:01,531 INFO L78 Accepts]: Start accepts. Automaton has 1574 states and 2192 transitions. Word has length 213 [2021-11-23 17:04:01,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:01,532 INFO L470 AbstractCegarLoop]: Abstraction has 1574 states and 2192 transitions. [2021-11-23 17:04:01,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 29.428571428571427) internal successors, (206), 7 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) [2021-11-23 17:04:01,533 INFO L276 IsEmpty]: Start isEmpty. Operand 1574 states and 2192 transitions. [2021-11-23 17:04:01,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-11-23 17:04:01,539 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:01,540 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:04:01,552 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-11-23 17:04:01,753 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (6)] Ended with exit code 0 [2021-11-23 17:04:01,952 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:01,952 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:01,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:01,953 INFO L85 PathProgramCache]: Analyzing trace with hash -1701848860, now seen corresponding path program 1 times [2021-11-23 17:04:01,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:01,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2110108189] [2021-11-23 17:04:01,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:01,955 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:01,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:01,956 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:01,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:04:02,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:02,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:04:02,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:04,788 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 135 proven. 32 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:04:04,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:07,225 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 135 proven. 32 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:04:07,226 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:07,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2110108189] [2021-11-23 17:04:07,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2110108189] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:07,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1167219587] [2021-11-23 17:04:07,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:07,227 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:07,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:07,233 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:07,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-23 17:04:07,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:07,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:07,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:07,794 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 89 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 17:04:07,795 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:07,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1167219587] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:07,795 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:04:07,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 17:04:07,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537497380] [2021-11-23 17:04:07,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:07,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:07,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:07,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:07,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:04:07,798 INFO L87 Difference]: Start difference. First operand 1574 states and 2192 transitions. Second operand has 3 states, 3 states have (on average 56.0) internal successors, (168), 3 states have internal predecessors, (168), 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) [2021-11-23 17:04:14,635 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:04:28,994 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.66s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:04:35,608 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:04:38,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:04:38,214 INFO L93 Difference]: Finished difference Result 3447 states and 5139 transitions. [2021-11-23 17:04:38,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:04:38,215 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 56.0) internal successors, (168), 3 states have internal predecessors, (168), 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 257 [2021-11-23 17:04:38,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:04:38,232 INFO L225 Difference]: With dead ends: 3447 [2021-11-23 17:04:38,233 INFO L226 Difference]: Without dead ends: 2475 [2021-11-23 17:04:38,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 768 GetRequests, 763 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:04:38,236 INFO L933 BasicCegarLoop]: 474 mSDtfsCounter, 360 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 999 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 360 SdHoareTripleChecker+Valid, 494 SdHoareTripleChecker+Invalid, 1127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 999 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:04:38,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [360 Valid, 494 Invalid, 1127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 999 Invalid, 0 Unknown, 0 Unchecked, 30.4s Time] [2021-11-23 17:04:38,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2475 states. [2021-11-23 17:04:38,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2475 to 2169. [2021-11-23 17:04:38,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2169 states, 2168 states have (on average 1.3874538745387455) internal successors, (3008), 2168 states have internal predecessors, (3008), 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) [2021-11-23 17:04:38,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2169 states to 2169 states and 3008 transitions. [2021-11-23 17:04:38,305 INFO L78 Accepts]: Start accepts. Automaton has 2169 states and 3008 transitions. Word has length 257 [2021-11-23 17:04:38,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:04:38,306 INFO L470 AbstractCegarLoop]: Abstraction has 2169 states and 3008 transitions. [2021-11-23 17:04:38,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 56.0) internal successors, (168), 3 states have internal predecessors, (168), 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) [2021-11-23 17:04:38,306 INFO L276 IsEmpty]: Start isEmpty. Operand 2169 states and 3008 transitions. [2021-11-23 17:04:38,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2021-11-23 17:04:38,313 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:04:38,314 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, 4, 4, 4, 4, 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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:04:38,316 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Ended with exit code 0 [2021-11-23 17:04:38,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:04:38,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:04:38,716 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:04:38,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:04:38,717 INFO L85 PathProgramCache]: Analyzing trace with hash -369151089, now seen corresponding path program 1 times [2021-11-23 17:04:38,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:04:38,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1670316623] [2021-11-23 17:04:38,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:38,718 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:04:38,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:04:38,719 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:04:38,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:04:38,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:38,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:04:39,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:41,478 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 218 proven. 32 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 17:04:41,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:43,853 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 218 proven. 32 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 17:04:43,853 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:04:43,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1670316623] [2021-11-23 17:04:43,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1670316623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:43,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1434955295] [2021-11-23 17:04:43,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:43,854 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:04:43,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:04:43,855 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:04:43,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-23 17:04:44,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:44,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:04:44,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:46,360 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 297 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:46,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:04:48,460 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 332 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:04:48,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1434955295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:04:48,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234910400] [2021-11-23 17:04:48,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:04:48,461 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:04:48,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:04:48,463 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:04:48,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 17:04:48,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:04:48,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:04:48,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:04:49,234 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 296 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 17:04:49,235 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:04:49,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234910400] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:04:49,235 INFO L186 FreeRefinementEngine]: Found 1 perfect and 4 imperfect interpolant sequences. [2021-11-23 17:04:49,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 8, 8] total 15 [2021-11-23 17:04:49,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5283833] [2021-11-23 17:04:49,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:04:49,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:04:49,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:04:49,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:04:49,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2021-11-23 17:04:49,239 INFO L87 Difference]: Start difference. First operand 2169 states and 3008 transitions. Second operand has 3 states, 3 states have (on average 79.33333333333333) internal successors, (238), 3 states have internal predecessors, (238), 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) [2021-11-23 17:05:09,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:09,064 INFO L93 Difference]: Finished difference Result 4633 states and 6767 transitions. [2021-11-23 17:05:09,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:05:09,070 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 79.33333333333333) internal successors, (238), 3 states have internal predecessors, (238), 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 282 [2021-11-23 17:05:09,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:09,087 INFO L225 Difference]: With dead ends: 4633 [2021-11-23 17:05:09,087 INFO L226 Difference]: Without dead ends: 3066 [2021-11-23 17:05:09,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1405 GetRequests, 1392 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2021-11-23 17:05:09,090 INFO L933 BasicCegarLoop]: 268 mSDtfsCounter, 273 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 744 mSolverCounterSat, 344 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 1088 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 344 IncrementalHoareTripleChecker+Valid, 744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:09,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [273 Valid, 333 Invalid, 1088 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [344 Valid, 744 Invalid, 0 Unknown, 0 Unchecked, 19.8s Time] [2021-11-23 17:05:09,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3066 states. [2021-11-23 17:05:09,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3066 to 2466. [2021-11-23 17:05:09,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2466 states, 2465 states have (on average 1.3626774847870182) internal successors, (3359), 2465 states have internal predecessors, (3359), 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) [2021-11-23 17:05:09,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2466 states to 2466 states and 3359 transitions. [2021-11-23 17:05:09,158 INFO L78 Accepts]: Start accepts. Automaton has 2466 states and 3359 transitions. Word has length 282 [2021-11-23 17:05:09,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:09,158 INFO L470 AbstractCegarLoop]: Abstraction has 2466 states and 3359 transitions. [2021-11-23 17:05:09,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 79.33333333333333) internal successors, (238), 3 states have internal predecessors, (238), 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) [2021-11-23 17:05:09,159 INFO L276 IsEmpty]: Start isEmpty. Operand 2466 states and 3359 transitions. [2021-11-23 17:05:09,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2021-11-23 17:05:09,165 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:09,165 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:05:09,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:05:09,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:05:09,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:05:09,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:05:09,783 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:09,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:09,783 INFO L85 PathProgramCache]: Analyzing trace with hash 661449875, now seen corresponding path program 1 times [2021-11-23 17:05:09,785 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:09,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1199759370] [2021-11-23 17:05:09,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:09,785 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:09,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:09,786 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:09,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:05:09,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:10,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:05:10,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:11,726 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 135 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 17:05:11,726 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:05:11,726 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:11,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1199759370] [2021-11-23 17:05:11,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1199759370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:05:11,726 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:05:11,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:05:11,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971269086] [2021-11-23 17:05:11,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:05:11,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:05:11,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:11,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:05:11,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:05:11,728 INFO L87 Difference]: Start difference. First operand 2466 states and 3359 transitions. Second operand has 3 states, 3 states have (on average 97.0) internal successors, (291), 2 states have internal predecessors, (291), 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) [2021-11-23 17:05:28,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:05:28,720 INFO L93 Difference]: Finished difference Result 5229 states and 7027 transitions. [2021-11-23 17:05:28,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:05:28,740 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 97.0) internal successors, (291), 2 states have internal predecessors, (291), 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 335 [2021-11-23 17:05:28,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:05:28,758 INFO L225 Difference]: With dead ends: 5229 [2021-11-23 17:05:28,758 INFO L226 Difference]: Without dead ends: 2765 [2021-11-23 17:05:28,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:05:28,764 INFO L933 BasicCegarLoop]: 323 mSDtfsCounter, 105 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 887 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:05:28,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 358 Invalid, 892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 887 Invalid, 0 Unknown, 0 Unchecked, 16.9s Time] [2021-11-23 17:05:28,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2765 states. [2021-11-23 17:05:28,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2765 to 2765. [2021-11-23 17:05:28,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2765 states, 2764 states have (on average 1.32561505065123) internal successors, (3664), 2764 states have internal predecessors, (3664), 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) [2021-11-23 17:05:28,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2765 states to 2765 states and 3664 transitions. [2021-11-23 17:05:28,857 INFO L78 Accepts]: Start accepts. Automaton has 2765 states and 3664 transitions. Word has length 335 [2021-11-23 17:05:28,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:05:28,858 INFO L470 AbstractCegarLoop]: Abstraction has 2765 states and 3664 transitions. [2021-11-23 17:05:28,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 97.0) internal successors, (291), 2 states have internal predecessors, (291), 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) [2021-11-23 17:05:28,859 INFO L276 IsEmpty]: Start isEmpty. Operand 2765 states and 3664 transitions. [2021-11-23 17:05:28,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2021-11-23 17:05:28,868 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:05:28,868 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:05:28,883 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-11-23 17:05:29,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:05:29,083 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:05:29,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:05:29,084 INFO L85 PathProgramCache]: Analyzing trace with hash -702566847, now seen corresponding path program 1 times [2021-11-23 17:05:29,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:05:29,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [98592339] [2021-11-23 17:05:29,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:29,086 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:05:29,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:05:29,087 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:05:29,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 17:05:29,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:29,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:05:29,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:30,820 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 89 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:30,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:05:42,719 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 89 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:42,719 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:05:42,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [98592339] [2021-11-23 17:05:42,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [98592339] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:05:42,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1634242870] [2021-11-23 17:05:42,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:05:42,720 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:05:42,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:05:42,721 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:05:42,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 17:05:42,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:05:42,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:05:42,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:05:43,700 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 180 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:05:43,700 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:05:43,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1634242870] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:05:43,700 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:05:43,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 17:05:43,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364896875] [2021-11-23 17:05:43,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:05:43,702 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:05:43,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:05:43,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:05:43,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:05:43,703 INFO L87 Difference]: Start difference. First operand 2765 states and 3664 transitions. Second operand has 3 states, 3 states have (on average 136.33333333333334) internal successors, (409), 3 states have internal predecessors, (409), 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) [2021-11-23 17:06:07,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:07,971 INFO L93 Difference]: Finished difference Result 6435 states and 8755 transitions. [2021-11-23 17:06:07,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:06:07,989 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 136.33333333333334) internal successors, (409), 3 states have internal predecessors, (409), 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 409 [2021-11-23 17:06:07,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:08,009 INFO L225 Difference]: With dead ends: 6435 [2021-11-23 17:06:08,010 INFO L226 Difference]: Without dead ends: 3971 [2021-11-23 17:06:08,013 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1224 GetRequests, 1219 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:06:08,014 INFO L933 BasicCegarLoop]: 623 mSDtfsCounter, 226 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 945 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 662 SdHoareTripleChecker+Invalid, 1163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 945 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:08,015 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 662 Invalid, 1163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 945 Invalid, 0 Unknown, 0 Unchecked, 24.2s Time] [2021-11-23 17:06:08,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3971 states. [2021-11-23 17:06:08,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3971 to 3669. [2021-11-23 17:06:08,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3669 states, 3668 states have (on average 1.2805343511450382) internal successors, (4697), 3668 states have internal predecessors, (4697), 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) [2021-11-23 17:06:08,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3669 states to 3669 states and 4697 transitions. [2021-11-23 17:06:08,110 INFO L78 Accepts]: Start accepts. Automaton has 3669 states and 4697 transitions. Word has length 409 [2021-11-23 17:06:08,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:08,111 INFO L470 AbstractCegarLoop]: Abstraction has 3669 states and 4697 transitions. [2021-11-23 17:06:08,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 136.33333333333334) internal successors, (409), 3 states have internal predecessors, (409), 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) [2021-11-23 17:06:08,112 INFO L276 IsEmpty]: Start isEmpty. Operand 3669 states and 4697 transitions. [2021-11-23 17:06:08,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 427 [2021-11-23 17:06:08,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:08,125 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, 4, 4, 4, 4, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:06:08,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:08,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:08,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:08,541 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:08,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:08,541 INFO L85 PathProgramCache]: Analyzing trace with hash -257237720, now seen corresponding path program 1 times [2021-11-23 17:06:08,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:08,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1159460919] [2021-11-23 17:06:08,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:08,544 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:08,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:08,545 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:08,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:06:08,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:08,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:06:08,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:11,022 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 258 proven. 32 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2021-11-23 17:06:11,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:13,313 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 258 proven. 32 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2021-11-23 17:06:13,313 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:13,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1159460919] [2021-11-23 17:06:13,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1159460919] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:13,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1418329153] [2021-11-23 17:06:13,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:13,314 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:13,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:06:13,328 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:06:13,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 17:06:13,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:13,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:06:13,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:14,359 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 316 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-23 17:06:14,359 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:06:14,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1418329153] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:06:14,359 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:06:14,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 17:06:14,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845142361] [2021-11-23 17:06:14,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:06:14,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:06:14,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:06:14,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:06:14,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:06:14,363 INFO L87 Difference]: Start difference. First operand 3669 states and 4697 transitions. Second operand has 3 states, 3 states have (on average 112.33333333333333) internal successors, (337), 3 states have internal predecessors, (337), 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) [2021-11-23 17:06:37,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:06:37,916 INFO L93 Difference]: Finished difference Result 8234 states and 10810 transitions. [2021-11-23 17:06:37,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:06:37,935 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 112.33333333333333) internal successors, (337), 3 states have internal predecessors, (337), 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 426 [2021-11-23 17:06:37,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:06:37,958 INFO L225 Difference]: With dead ends: 8234 [2021-11-23 17:06:37,959 INFO L226 Difference]: Without dead ends: 4866 [2021-11-23 17:06:37,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1275 GetRequests, 1270 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:06:37,963 INFO L933 BasicCegarLoop]: 579 mSDtfsCounter, 234 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 880 mSolverCounterSat, 241 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 618 SdHoareTripleChecker+Invalid, 1121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 241 IncrementalHoareTripleChecker+Valid, 880 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:06:37,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [234 Valid, 618 Invalid, 1121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [241 Valid, 880 Invalid, 0 Unknown, 0 Unchecked, 23.5s Time] [2021-11-23 17:06:37,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4866 states. [2021-11-23 17:06:38,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4866 to 4565. [2021-11-23 17:06:38,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4565 states, 4564 states have (on average 1.2486853637160387) internal successors, (5699), 4564 states have internal predecessors, (5699), 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) [2021-11-23 17:06:38,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4565 states to 4565 states and 5699 transitions. [2021-11-23 17:06:38,081 INFO L78 Accepts]: Start accepts. Automaton has 4565 states and 5699 transitions. Word has length 426 [2021-11-23 17:06:38,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:06:38,082 INFO L470 AbstractCegarLoop]: Abstraction has 4565 states and 5699 transitions. [2021-11-23 17:06:38,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 112.33333333333333) internal successors, (337), 3 states have internal predecessors, (337), 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) [2021-11-23 17:06:38,083 INFO L276 IsEmpty]: Start isEmpty. Operand 4565 states and 5699 transitions. [2021-11-23 17:06:38,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 522 [2021-11-23 17:06:38,090 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:06:38,091 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, 4, 4, 4, 4, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:06:38,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:06:38,309 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Ended with exit code 0 [2021-11-23 17:06:38,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:38,508 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:06:38,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:06:38,508 INFO L85 PathProgramCache]: Analyzing trace with hash 935723317, now seen corresponding path program 1 times [2021-11-23 17:06:38,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:06:38,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [352413562] [2021-11-23 17:06:38,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:38,512 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:06:38,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:06:38,513 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:06:38,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 17:06:38,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:38,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 582 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:06:38,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:40,885 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 282 proven. 106 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 17:06:40,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:06:53,124 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 282 proven. 106 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 17:06:53,124 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:06:53,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [352413562] [2021-11-23 17:06:53,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [352413562] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:06:53,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [622213361] [2021-11-23 17:06:53,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:06:53,125 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:06:53,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:06:53,126 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:06:53,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 17:06:53,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:06:53,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 582 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:06:53,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:06:56,028 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 282 proven. 106 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 17:06:56,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:08,094 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 282 proven. 106 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 17:07:08,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [622213361] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:08,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463008022] [2021-11-23 17:07:08,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:08,095 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:07:08,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:07:08,097 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:07:08,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 17:07:08,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:08,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 582 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:07:08,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:10,344 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 134 proven. 193 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 17:07:10,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:11,667 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 327 proven. 0 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 17:07:11,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463008022] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:07:11,668 INFO L186 FreeRefinementEngine]: Found 1 perfect and 5 imperfect interpolant sequences. [2021-11-23 17:07:11,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3, 3, 3] total 9 [2021-11-23 17:07:11,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115240362] [2021-11-23 17:07:11,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:07:11,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:07:11,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:07:11,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:07:11,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:07:11,671 INFO L87 Difference]: Start difference. First operand 4565 states and 5699 transitions. Second operand has 3 states, 3 states have (on average 138.66666666666666) internal successors, (416), 3 states have internal predecessors, (416), 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) [2021-11-23 17:07:27,594 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.59s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:07:38,737 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.09s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:07:43,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:07:43,943 INFO L93 Difference]: Finished difference Result 11221 states and 13891 transitions. [2021-11-23 17:07:43,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:07:43,961 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 138.66666666666666) internal successors, (416), 3 states have internal predecessors, (416), 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 521 [2021-11-23 17:07:43,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:07:44,016 INFO L225 Difference]: With dead ends: 11221 [2021-11-23 17:07:44,016 INFO L226 Difference]: Without dead ends: 6957 [2021-11-23 17:07:44,021 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3120 GetRequests, 3113 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:07:44,022 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 279 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 871 mSolverCounterSat, 323 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 1195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 323 IncrementalHoareTripleChecker+Valid, 871 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:07:44,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [279 Valid, 171 Invalid, 1195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [323 Valid, 871 Invalid, 1 Unknown, 0 Unchecked, 32.2s Time] [2021-11-23 17:07:44,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6957 states. [2021-11-23 17:07:44,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6957 to 5761. [2021-11-23 17:07:44,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5761 states, 5760 states have (on average 1.2206597222222222) internal successors, (7031), 5760 states have internal predecessors, (7031), 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) [2021-11-23 17:07:44,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5761 states to 5761 states and 7031 transitions. [2021-11-23 17:07:44,146 INFO L78 Accepts]: Start accepts. Automaton has 5761 states and 7031 transitions. Word has length 521 [2021-11-23 17:07:44,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:07:44,147 INFO L470 AbstractCegarLoop]: Abstraction has 5761 states and 7031 transitions. [2021-11-23 17:07:44,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 138.66666666666666) internal successors, (416), 3 states have internal predecessors, (416), 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) [2021-11-23 17:07:44,148 INFO L276 IsEmpty]: Start isEmpty. Operand 5761 states and 7031 transitions. [2021-11-23 17:07:44,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 549 [2021-11-23 17:07:44,155 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:07:44,156 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, 4, 4, 4, 4, 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, 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, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:07:44,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:07:44,390 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2021-11-23 17:07:44,584 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Ended with exit code 0 [2021-11-23 17:07:44,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:44,781 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:07:44,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:07:44,781 INFO L85 PathProgramCache]: Analyzing trace with hash 265444407, now seen corresponding path program 1 times [2021-11-23 17:07:44,784 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:07:44,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1281498867] [2021-11-23 17:07:44,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:44,785 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:07:44,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:07:44,786 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:07:44,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:07:45,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:07:45,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 608 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:07:45,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:07:47,401 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 319 proven. 106 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 17:07:47,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:07:59,553 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 319 proven. 106 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 17:07:59,553 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:07:59,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1281498867] [2021-11-23 17:07:59,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1281498867] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:07:59,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [31554026] [2021-11-23 17:07:59,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:07:59,554 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:07:59,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:07:59,555 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:07:59,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-23 17:08:00,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:00,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 608 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:08:01,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:03,005 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 319 proven. 106 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 17:08:03,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:14,793 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 319 proven. 106 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 17:08:14,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [31554026] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:08:14,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635312771] [2021-11-23 17:08:14,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:14,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:14,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:08:14,795 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:08:14,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 17:08:15,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:15,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 608 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:08:15,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:16,944 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 134 proven. 230 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 17:08:16,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:08:18,377 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 364 proven. 0 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-23 17:08:18,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635312771] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:08:18,377 INFO L186 FreeRefinementEngine]: Found 1 perfect and 5 imperfect interpolant sequences. [2021-11-23 17:08:18,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3, 3, 3] total 9 [2021-11-23 17:08:18,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129802314] [2021-11-23 17:08:18,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:08:18,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:08:18,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:08:18,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:08:18,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:08:18,382 INFO L87 Difference]: Start difference. First operand 5761 states and 7031 transitions. Second operand has 3 states, 3 states have (on average 147.66666666666666) internal successors, (443), 3 states have internal predecessors, (443), 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) [2021-11-23 17:08:30,383 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.51s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:08:52,348 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:08:54,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:08:54,701 INFO L93 Difference]: Finished difference Result 15407 states and 18843 transitions. [2021-11-23 17:08:54,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:08:54,703 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 147.66666666666666) internal successors, (443), 3 states have internal predecessors, (443), 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 548 [2021-11-23 17:08:54,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:08:54,720 INFO L225 Difference]: With dead ends: 15407 [2021-11-23 17:08:54,721 INFO L226 Difference]: Without dead ends: 9947 [2021-11-23 17:08:54,727 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3282 GetRequests, 3275 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:08:54,728 INFO L933 BasicCegarLoop]: 177 mSDtfsCounter, 246 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 992 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 1183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 992 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 36.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:08:54,729 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 207 Invalid, 1183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 992 Invalid, 0 Unknown, 0 Unchecked, 36.2s Time] [2021-11-23 17:08:54,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9947 states. [2021-11-23 17:08:54,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9947 to 8452. [2021-11-23 17:08:54,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8452 states, 8451 states have (on average 1.2099159862738138) internal successors, (10225), 8451 states have internal predecessors, (10225), 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) [2021-11-23 17:08:54,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8452 states to 8452 states and 10225 transitions. [2021-11-23 17:08:54,918 INFO L78 Accepts]: Start accepts. Automaton has 8452 states and 10225 transitions. Word has length 548 [2021-11-23 17:08:54,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:08:54,919 INFO L470 AbstractCegarLoop]: Abstraction has 8452 states and 10225 transitions. [2021-11-23 17:08:54,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 147.66666666666666) internal successors, (443), 3 states have internal predecessors, (443), 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) [2021-11-23 17:08:54,920 INFO L276 IsEmpty]: Start isEmpty. Operand 8452 states and 10225 transitions. [2021-11-23 17:08:54,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 686 [2021-11-23 17:08:54,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:08:54,933 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 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, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 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, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:08:54,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:55,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:55,369 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:08:55,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:08:55,539 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:08:55,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:08:55,540 INFO L85 PathProgramCache]: Analyzing trace with hash 236608447, now seen corresponding path program 1 times [2021-11-23 17:08:55,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:08:55,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1688523987] [2021-11-23 17:08:55,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:08:55,544 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:08:55,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:08:55,545 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:08:55,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:08:55,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:08:55,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:08:55,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:08:58,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1183 backedges. 489 proven. 32 refuted. 0 times theorem prover too weak. 662 trivial. 0 not checked. [2021-11-23 17:08:58,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:01,414 INFO L134 CoverageAnalysis]: Checked inductivity of 1183 backedges. 489 proven. 32 refuted. 0 times theorem prover too weak. 662 trivial. 0 not checked. [2021-11-23 17:09:01,415 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:09:01,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1688523987] [2021-11-23 17:09:01,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1688523987] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:01,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1971979215] [2021-11-23 17:09:01,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:01,415 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:09:01,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:09:01,416 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:09:01,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-23 17:09:02,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:02,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:09:02,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:06,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1183 backedges. 567 proven. 359 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2021-11-23 17:09:06,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:10,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1183 backedges. 567 proven. 359 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2021-11-23 17:09:10,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1971979215] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:10,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283982361] [2021-11-23 17:09:10,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:09:10,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:09:10,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:09:10,622 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:09:10,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 17:09:10,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:09:10,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:09:10,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:09:13,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1183 backedges. 695 proven. 90 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-23 17:09:13,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:09:16,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1183 backedges. 695 proven. 90 refuted. 0 times theorem prover too weak. 398 trivial. 0 not checked. [2021-11-23 17:09:16,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283982361] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:09:16,079 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:09:16,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 4, 4, 4, 4] total 15 [2021-11-23 17:09:16,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523351596] [2021-11-23 17:09:16,081 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:09:16,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:09:16,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:09:16,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:09:16,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:09:16,085 INFO L87 Difference]: Start difference. First operand 8452 states and 10225 transitions. Second operand has 16 states, 16 states have (on average 85.5625) internal successors, (1369), 15 states have internal predecessors, (1369), 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) [2021-11-23 17:09:48,392 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:10:17,249 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.98s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:10:21,149 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:11:10,715 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:12:30,955 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:12:32,396 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:13:06,836 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.76s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:13:12,694 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:13:40,721 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:13:42,724 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:13:55,442 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:13:59,601 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:14:06,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:14:06,548 INFO L93 Difference]: Finished difference Result 26952 states and 32623 transitions. [2021-11-23 17:14:06,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 17:14:06,551 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 85.5625) internal successors, (1369), 15 states have internal predecessors, (1369), 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 685 [2021-11-23 17:14:06,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:14:06,582 INFO L225 Difference]: With dead ends: 26952 [2021-11-23 17:14:06,582 INFO L226 Difference]: Without dead ends: 15958 [2021-11-23 17:14:06,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4116 GetRequests, 4090 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=193, Invalid=563, Unknown=0, NotChecked=0, Total=756 [2021-11-23 17:14:06,593 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 4143 mSDsluCounter, 358 mSDsCounter, 0 mSdLazyCounter, 12272 mSolverCounterSat, 1644 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 278.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4143 SdHoareTripleChecker+Valid, 479 SdHoareTripleChecker+Invalid, 13918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1644 IncrementalHoareTripleChecker+Valid, 12272 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 289.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:14:06,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4143 Valid, 479 Invalid, 13918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1644 Valid, 12272 Invalid, 2 Unknown, 0 Unchecked, 289.4s Time] [2021-11-23 17:14:06,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15958 states. [2021-11-23 17:14:06,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15958 to 12042. [2021-11-23 17:14:06,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12042 states, 12041 states have (on average 1.1004069429449381) internal successors, (13250), 12041 states have internal predecessors, (13250), 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) [2021-11-23 17:14:06,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12042 states to 12042 states and 13250 transitions. [2021-11-23 17:14:06,942 INFO L78 Accepts]: Start accepts. Automaton has 12042 states and 13250 transitions. Word has length 685 [2021-11-23 17:14:06,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:14:06,943 INFO L470 AbstractCegarLoop]: Abstraction has 12042 states and 13250 transitions. [2021-11-23 17:14:06,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 85.5625) internal successors, (1369), 15 states have internal predecessors, (1369), 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) [2021-11-23 17:14:06,944 INFO L276 IsEmpty]: Start isEmpty. Operand 12042 states and 13250 transitions. [2021-11-23 17:14:06,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 694 [2021-11-23 17:14:06,968 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:06,970 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 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, 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, 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, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:14:07,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:07,194 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Ended with exit code 0 [2021-11-23 17:14:07,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:14:07,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:14:07,589 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:07,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:07,590 INFO L85 PathProgramCache]: Analyzing trace with hash 53451563, now seen corresponding path program 1 times [2021-11-23 17:14:07,593 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:07,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [986513125] [2021-11-23 17:14:07,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:07,594 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:07,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:07,595 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:07,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 17:14:08,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:08,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:14:08,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:10,901 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 461 proven. 188 refuted. 0 times theorem prover too weak. 166 trivial. 0 not checked. [2021-11-23 17:14:10,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:14:24,699 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 461 proven. 188 refuted. 0 times theorem prover too weak. 166 trivial. 0 not checked. [2021-11-23 17:14:24,699 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:24,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [986513125] [2021-11-23 17:14:24,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [986513125] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:14:24,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [773616190] [2021-11-23 17:14:24,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:24,700 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:24,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:14:24,701 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:14:24,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d566ee73-c44a-4791-b967-bff177dae332/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-23 17:14:25,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:25,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:14:25,816 INFO L286 TraceCheckSpWp]: Computing forward predicates...