./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem16_label36.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_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/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_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem16_label36.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/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_877cda75-e63e-4c08-82f9-394594179e53/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 2937f5953993aa4d6e5a2b4e477fd67f649eb79fefa51556f9f9db8f2ffb7a65 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:14:23,563 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:14:23,566 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:14:23,618 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:14:23,619 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:14:23,624 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:14:23,627 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:14:23,632 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:14:23,636 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:14:23,646 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:14:23,647 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:14:23,650 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:14:23,650 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:14:23,655 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:14:23,659 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:14:23,669 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:14:23,670 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:14:23,671 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:14:23,674 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:14:23,677 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:14:23,682 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:14:23,684 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:14:23,689 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:14:23,691 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:14:23,707 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:14:23,708 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:14:23,709 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:14:23,710 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:14:23,711 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:14:23,712 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:14:23,713 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:14:23,714 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:14:23,715 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:14:23,719 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:14:23,726 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:14:23,727 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:14:23,728 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:14:23,728 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:14:23,728 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:14:23,730 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:14:23,731 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:14:23,732 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:14:23,792 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:14:23,792 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:14:23,793 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:14:23,793 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:14:23,795 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:14:23,795 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:14:23,796 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:14:23,796 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:14:23,796 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:14:23,796 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:14:23,798 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:14:23,798 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:14:23,799 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:14:23,799 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:14:23,799 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:14:23,799 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:14:23,800 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:14:23,800 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:14:23,802 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:14:23,802 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:14:23,803 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:14:23,803 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:14:23,803 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:14:23,803 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:14:23,804 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:14:23,804 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:14:23,806 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:14:23,806 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:14:23,807 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:14:23,807 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:14:23,807 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:14:23,808 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:14:23,808 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:23,808 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:14:23,809 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:14:23,809 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:14:23,809 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:14:23,809 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:14:23,810 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:14:23,810 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:14:23,810 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:14:23,811 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_877cda75-e63e-4c08-82f9-394594179e53/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2937f5953993aa4d6e5a2b4e477fd67f649eb79fefa51556f9f9db8f2ffb7a65 [2021-11-23 17:14:24,185 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:14:24,213 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:14:24,216 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:14:24,218 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:14:24,219 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:14:24,221 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem16_label36.c [2021-11-23 17:14:24,301 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/data/47f0afd35/a8bfdb80c60645398b3af93f226cd8c6/FLAG138c484ac [2021-11-23 17:14:25,211 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:14:25,214 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/sv-benchmarks/c/eca-rers2012/Problem16_label36.c [2021-11-23 17:14:25,246 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/data/47f0afd35/a8bfdb80c60645398b3af93f226cd8c6/FLAG138c484ac [2021-11-23 17:14:25,758 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/data/47f0afd35/a8bfdb80c60645398b3af93f226cd8c6 [2021-11-23 17:14:25,761 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:14:25,763 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:14:25,765 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:25,765 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:14:25,769 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:14:25,770 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:25" (1/1) ... [2021-11-23 17:14:25,771 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38ce29ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:25, skipping insertion in model container [2021-11-23 17:14:25,772 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:25" (1/1) ... [2021-11-23 17:14:25,780 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:14:25,869 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:14:26,246 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_877cda75-e63e-4c08-82f9-394594179e53/sv-benchmarks/c/eca-rers2012/Problem16_label36.c[3906,3919] [2021-11-23 17:14:26,945 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:26,958 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:14:27,010 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_877cda75-e63e-4c08-82f9-394594179e53/sv-benchmarks/c/eca-rers2012/Problem16_label36.c[3906,3919] [2021-11-23 17:14:27,310 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:27,333 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:14:27,333 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:27 WrapperNode [2021-11-23 17:14:27,334 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:27,335 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:27,335 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:14:27,336 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:14:27,346 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:27" (1/1) ... [2021-11-23 17:14:27,421 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:27" (1/1) ... [2021-11-23 17:14:27,575 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1768 [2021-11-23 17:14:27,575 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:27,576 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:14:27,577 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:14:27,577 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:14:27,588 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:27" (1/1) ... [2021-11-23 17:14:27,588 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:27" (1/1) ... [2021-11-23 17:14:27,609 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:27" (1/1) ... [2021-11-23 17:14:27,610 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:27" (1/1) ... [2021-11-23 17:14:27,788 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:27" (1/1) ... [2021-11-23 17:14:27,821 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:27" (1/1) ... [2021-11-23 17:14:27,836 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:27" (1/1) ... [2021-11-23 17:14:27,862 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:14:27,864 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:14:27,864 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:14:27,864 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:14:27,866 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:27" (1/1) ... [2021-11-23 17:14:27,876 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:27,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:27,906 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:14:27,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:14:27,968 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:14:27,968 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:14:27,968 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:14:27,968 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:14:28,066 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:14:28,069 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:14:30,796 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:14:30,855 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 17:14:30,868 INFO L158 Benchmark]: Toolchain (without parser) took 5102.01ms. Allocated memory was 86.0MB in the beginning and 209.7MB in the end (delta: 123.7MB). Free memory was 61.1MB in the beginning and 102.3MB in the end (delta: -41.1MB). Peak memory consumption was 91.7MB. Max. memory is 16.1GB. [2021-11-23 17:14:30,870 INFO L158 Benchmark]: CDTParser took 0.38ms. Allocated memory is still 86.0MB. Free memory was 65.1MB in the beginning and 65.0MB in the end (delta: 83.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:14:30,872 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1569.62ms. Allocated memory was 86.0MB in the beginning and 117.4MB in the end (delta: 31.5MB). Free memory was 61.1MB in the beginning and 77.7MB in the end (delta: -16.6MB). Peak memory consumption was 42.5MB. Max. memory is 16.1GB. [2021-11-23 17:14:30,874 INFO L158 Benchmark]: Boogie Procedure Inliner took 240.30ms. Allocated memory is still 117.4MB. Free memory was 77.7MB in the beginning and 54.1MB in the end (delta: 23.7MB). Peak memory consumption was 23.1MB. Max. memory is 16.1GB. [2021-11-23 17:14:30,875 INFO L158 Benchmark]: Boogie Preprocessor took 285.94ms. Allocated memory is still 117.4MB. Free memory was 54.1MB in the beginning and 66.5MB in the end (delta: -12.4MB). Peak memory consumption was 22.4MB. Max. memory is 16.1GB. [2021-11-23 17:14:30,877 INFO L158 Benchmark]: RCFGBuilder took 3000.28ms. Allocated memory was 117.4MB in the beginning and 209.7MB in the end (delta: 92.3MB). Free memory was 66.5MB in the beginning and 102.3MB in the end (delta: -35.8MB). Peak memory consumption was 66.6MB. Max. memory is 16.1GB. [2021-11-23 17:14:30,887 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.38ms. Allocated memory is still 86.0MB. Free memory was 65.1MB in the beginning and 65.0MB in the end (delta: 83.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1569.62ms. Allocated memory was 86.0MB in the beginning and 117.4MB in the end (delta: 31.5MB). Free memory was 61.1MB in the beginning and 77.7MB in the end (delta: -16.6MB). Peak memory consumption was 42.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 240.30ms. Allocated memory is still 117.4MB. Free memory was 77.7MB in the beginning and 54.1MB in the end (delta: 23.7MB). Peak memory consumption was 23.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 285.94ms. Allocated memory is still 117.4MB. Free memory was 54.1MB in the beginning and 66.5MB in the end (delta: -12.4MB). Peak memory consumption was 22.4MB. Max. memory is 16.1GB. * RCFGBuilder took 3000.28ms. Allocated memory was 117.4MB in the beginning and 209.7MB in the end (delta: 92.3MB). Free memory was 66.5MB in the beginning and 102.3MB in the end (delta: -35.8MB). Peak memory consumption was 66.6MB. 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 17:14:30,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/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_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/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_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem16_label36.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/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_877cda75-e63e-4c08-82f9-394594179e53/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 2937f5953993aa4d6e5a2b4e477fd67f649eb79fefa51556f9f9db8f2ffb7a65 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:14:34,039 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:14:34,042 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:14:34,094 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:14:34,095 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:14:34,101 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:14:34,105 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:14:34,109 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:14:34,111 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:14:34,113 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:14:34,115 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:14:34,119 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:14:34,121 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:14:34,128 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:14:34,131 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:14:34,134 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:14:34,137 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:14:34,139 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:14:34,145 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:14:34,151 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:14:34,158 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:14:34,160 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:14:34,163 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:14:34,167 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:14:34,176 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:14:34,182 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:14:34,183 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:14:34,184 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:14:34,185 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:14:34,186 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:14:34,187 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:14:34,188 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:14:34,189 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:14:34,191 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:14:34,192 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:14:34,193 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:14:34,194 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:14:34,194 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:14:34,195 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:14:34,196 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:14:34,197 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:14:34,198 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:14:34,234 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:14:34,234 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:14:34,234 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:14:34,235 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:14:34,236 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:14:34,236 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:14:34,236 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:14:34,237 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:14:34,237 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:14:34,237 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:14:34,237 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:14:34,238 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:14:34,239 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:14:34,239 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:14:34,240 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:14:34,240 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:14:34,240 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:14:34,240 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:14:34,241 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:14:34,241 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:14:34,241 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:14:34,242 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:14:34,242 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:14:34,242 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:14:34,243 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:14:34,243 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:14:34,243 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:14:34,243 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:14:34,244 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:14:34,244 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:34,244 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:14:34,245 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:14:34,245 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:14:34,245 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:14:34,246 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:14:34,246 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:14:34,246 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:14:34,247 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:14:34,247 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_877cda75-e63e-4c08-82f9-394594179e53/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2937f5953993aa4d6e5a2b4e477fd67f649eb79fefa51556f9f9db8f2ffb7a65 [2021-11-23 17:14:34,749 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:14:34,781 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:14:34,784 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:14:34,786 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:14:34,788 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:14:34,790 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/eca-rers2012/Problem16_label36.c [2021-11-23 17:14:34,888 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/data/efc7baaa9/ceebcf4185064331919b078e5317a426/FLAGc0dc72dc0 [2021-11-23 17:14:35,931 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:14:35,931 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/sv-benchmarks/c/eca-rers2012/Problem16_label36.c [2021-11-23 17:14:35,956 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/data/efc7baaa9/ceebcf4185064331919b078e5317a426/FLAGc0dc72dc0 [2021-11-23 17:14:35,987 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/data/efc7baaa9/ceebcf4185064331919b078e5317a426 [2021-11-23 17:14:35,991 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:14:35,994 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:14:35,998 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:35,998 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:14:36,003 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:14:36,005 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:35" (1/1) ... [2021-11-23 17:14:36,007 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d6ee465 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:36, skipping insertion in model container [2021-11-23 17:14:36,007 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:14:35" (1/1) ... [2021-11-23 17:14:36,017 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:14:36,159 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:14:36,453 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_877cda75-e63e-4c08-82f9-394594179e53/sv-benchmarks/c/eca-rers2012/Problem16_label36.c[3906,3919] [2021-11-23 17:14:37,264 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:37,279 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:14:37,319 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_877cda75-e63e-4c08-82f9-394594179e53/sv-benchmarks/c/eca-rers2012/Problem16_label36.c[3906,3919] [2021-11-23 17:14:37,626 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:14:37,651 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:14:37,652 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37 WrapperNode [2021-11-23 17:14:37,652 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:14:37,653 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:37,654 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:14:37,654 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:14:37,664 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37" (1/1) ... [2021-11-23 17:14:37,733 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37" (1/1) ... [2021-11-23 17:14:37,901 INFO L137 Inliner]: procedures = 15, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 1765 [2021-11-23 17:14:37,901 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:14:37,903 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:14:37,904 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:14:37,905 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:14:37,917 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37" (1/1) ... [2021-11-23 17:14:37,917 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37" (1/1) ... [2021-11-23 17:14:37,937 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37" (1/1) ... [2021-11-23 17:14:37,938 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37" (1/1) ... [2021-11-23 17:14:37,997 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37" (1/1) ... [2021-11-23 17:14:38,038 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37" (1/1) ... [2021-11-23 17:14:38,068 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37" (1/1) ... [2021-11-23 17:14:38,085 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:14:38,087 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:14:38,087 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:14:38,087 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:14:38,088 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37" (1/1) ... [2021-11-23 17:14:38,099 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:14:38,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:14:38,134 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:14:38,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:14:38,197 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:14:38,197 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:14:38,197 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:14:38,197 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:14:38,289 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:14:38,291 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:14:48,871 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:14:48,888 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:14:48,888 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:14:48,896 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:14:48 BoogieIcfgContainer [2021-11-23 17:14:48,896 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:14:48,902 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:14:48,903 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:14:48,907 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:14:48,907 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:14:35" (1/3) ... [2021-11-23 17:14:48,909 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e2e1a94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:14:48, skipping insertion in model container [2021-11-23 17:14:48,909 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:14:37" (2/3) ... [2021-11-23 17:14:48,910 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e2e1a94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:14:48, skipping insertion in model container [2021-11-23 17:14:48,910 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:14:48" (3/3) ... [2021-11-23 17:14:48,913 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem16_label36.c [2021-11-23 17:14:48,928 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:14:48,928 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:14:49,005 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:14:49,015 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 17:14:49,015 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:14:49,052 INFO L276 IsEmpty]: Start isEmpty. Operand has 396 states, 394 states have (on average 1.8350253807106598) internal successors, (723), 395 states have internal predecessors, (723), 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 17:14:49,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 17:14:49,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:14:49,063 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] [2021-11-23 17:14:49,064 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:14:49,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:14:49,071 INFO L85 PathProgramCache]: Analyzing trace with hash -1318097310, now seen corresponding path program 1 times [2021-11-23 17:14:49,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:14:49,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [799254789] [2021-11-23 17:14:49,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:14:49,093 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:14:49,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:14:49,100 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:14:49,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:14:49,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:14:49,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:14:49,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:14:49,523 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 17:14:49,523 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:14:49,524 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:14:49,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [799254789] [2021-11-23 17:14:49,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [799254789] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:14:49,526 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:14:49,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:14:49,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630408853] [2021-11-23 17:14:49,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:14:49,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:14:49,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:14:49,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:14:49,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:14:49,594 INFO L87 Difference]: Start difference. First operand has 396 states, 394 states have (on average 1.8350253807106598) internal successors, (723), 395 states have internal predecessors, (723), 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 12.0) internal successors, (36), 2 states have internal predecessors, (36), 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 17:15:01,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:01,643 INFO L93 Difference]: Finished difference Result 1122 states and 2103 transitions. [2021-11-23 17:15:01,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:01,650 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 2 states have internal predecessors, (36), 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 36 [2021-11-23 17:15:01,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:01,678 INFO L225 Difference]: With dead ends: 1122 [2021-11-23 17:15:01,678 INFO L226 Difference]: Without dead ends: 662 [2021-11-23 17:15:01,685 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 34 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 17:15:01,690 INFO L933 BasicCegarLoop]: 246 mSDtfsCounter, 351 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 864 mSolverCounterSat, 450 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 351 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 1314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 450 IncrementalHoareTripleChecker+Valid, 864 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:01,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [351 Valid, 254 Invalid, 1314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [450 Valid, 864 Invalid, 0 Unknown, 0 Unchecked, 11.9s Time] [2021-11-23 17:15:01,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 662 states. [2021-11-23 17:15:01,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 662 to 662. [2021-11-23 17:15:01,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 662 states, 661 states have (on average 1.518910741301059) internal successors, (1004), 661 states have internal predecessors, (1004), 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 17:15:01,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 662 states to 662 states and 1004 transitions. [2021-11-23 17:15:01,810 INFO L78 Accepts]: Start accepts. Automaton has 662 states and 1004 transitions. Word has length 36 [2021-11-23 17:15:01,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:01,811 INFO L470 AbstractCegarLoop]: Abstraction has 662 states and 1004 transitions. [2021-11-23 17:15:01,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 2 states have internal predecessors, (36), 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 17:15:01,812 INFO L276 IsEmpty]: Start isEmpty. Operand 662 states and 1004 transitions. [2021-11-23 17:15:01,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 17:15:01,818 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:01,819 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:15:01,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:02,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:02,037 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:02,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:02,038 INFO L85 PathProgramCache]: Analyzing trace with hash -187693764, now seen corresponding path program 1 times [2021-11-23 17:15:02,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:02,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1069301621] [2021-11-23 17:15:02,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:02,040 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:02,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:02,042 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:02,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:15:02,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:02,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:02,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:02,597 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:02,597 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:02,597 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:02,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1069301621] [2021-11-23 17:15:02,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1069301621] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:02,598 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:02,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:15:02,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716718885] [2021-11-23 17:15:02,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:02,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:02,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:02,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:02,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:02,603 INFO L87 Difference]: Start difference. First operand 662 states and 1004 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 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 17:15:14,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:14,459 INFO L93 Difference]: Finished difference Result 1980 states and 3007 transitions. [2021-11-23 17:15:14,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:14,460 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 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 104 [2021-11-23 17:15:14,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:14,472 INFO L225 Difference]: With dead ends: 1980 [2021-11-23 17:15:14,473 INFO L226 Difference]: Without dead ends: 1320 [2021-11-23 17:15:14,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 102 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 17:15:14,479 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 271 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 961 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 1179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 961 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:14,480 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 225 Invalid, 1179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 961 Invalid, 0 Unknown, 0 Unchecked, 11.8s Time] [2021-11-23 17:15:14,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1320 states. [2021-11-23 17:15:14,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1320 to 1320. [2021-11-23 17:15:14,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1320 states, 1319 states have (on average 1.3146322971948445) internal successors, (1734), 1319 states have internal predecessors, (1734), 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 17:15:14,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1320 states to 1320 states and 1734 transitions. [2021-11-23 17:15:14,561 INFO L78 Accepts]: Start accepts. Automaton has 1320 states and 1734 transitions. Word has length 104 [2021-11-23 17:15:14,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:14,562 INFO L470 AbstractCegarLoop]: Abstraction has 1320 states and 1734 transitions. [2021-11-23 17:15:14,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 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 17:15:14,563 INFO L276 IsEmpty]: Start isEmpty. Operand 1320 states and 1734 transitions. [2021-11-23 17:15:14,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-11-23 17:15:14,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:14,579 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:15:14,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:14,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:14,794 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:14,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:14,795 INFO L85 PathProgramCache]: Analyzing trace with hash 2139085675, now seen corresponding path program 1 times [2021-11-23 17:15:14,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:14,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1927784931] [2021-11-23 17:15:14,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:14,798 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:14,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:14,800 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:14,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:15:14,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:14,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:15:14,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:16,840 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 78 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:16,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:22,167 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 78 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:22,168 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:22,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1927784931] [2021-11-23 17:15:22,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1927784931] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:22,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [34593331] [2021-11-23 17:15:22,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:22,169 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:22,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:22,179 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:22,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-23 17:15:22,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:22,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:15:22,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:24,890 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 134 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:24,891 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:24,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [34593331] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:24,891 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:15:24,892 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3] total 11 [2021-11-23 17:15:24,892 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882815983] [2021-11-23 17:15:24,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:24,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:15:24,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:24,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:15:24,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:15:24,895 INFO L87 Difference]: Start difference. First operand 1320 states and 1734 transitions. Second operand has 7 states, 7 states have (on average 27.285714285714285) internal successors, (191), 7 states have internal predecessors, (191), 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 17:15:33,074 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:15:35,076 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:15:41,302 WARN L534 Checker$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 17:15:46,584 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:15:58,884 WARN L534 Checker$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 17:16:00,886 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 17:16:03,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:03,392 INFO L93 Difference]: Finished difference Result 3401 states and 4572 transitions. [2021-11-23 17:16:03,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:16:03,394 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 27.285714285714285) internal successors, (191), 7 states have internal predecessors, (191), 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 191 [2021-11-23 17:16:03,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:03,404 INFO L225 Difference]: With dead ends: 3401 [2021-11-23 17:16:03,404 INFO L226 Difference]: Without dead ends: 1320 [2021-11-23 17:16:03,407 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 562 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:16:03,409 INFO L933 BasicCegarLoop]: 402 mSDtfsCounter, 1339 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 2246 mSolverCounterSat, 869 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1339 SdHoareTripleChecker+Valid, 430 SdHoareTripleChecker+Invalid, 3118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 869 IncrementalHoareTripleChecker+Valid, 2246 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 38.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:03,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1339 Valid, 430 Invalid, 3118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [869 Valid, 2246 Invalid, 3 Unknown, 0 Unchecked, 38.3s Time] [2021-11-23 17:16:03,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1320 states. [2021-11-23 17:16:03,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1320 to 1320. [2021-11-23 17:16:03,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1320 states, 1319 states have (on average 1.092494313874147) internal successors, (1441), 1319 states have internal predecessors, (1441), 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 17:16:03,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1320 states to 1320 states and 1441 transitions. [2021-11-23 17:16:03,451 INFO L78 Accepts]: Start accepts. Automaton has 1320 states and 1441 transitions. Word has length 191 [2021-11-23 17:16:03,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:03,452 INFO L470 AbstractCegarLoop]: Abstraction has 1320 states and 1441 transitions. [2021-11-23 17:16:03,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 27.285714285714285) internal successors, (191), 7 states have internal predecessors, (191), 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 17:16:03,453 INFO L276 IsEmpty]: Start isEmpty. Operand 1320 states and 1441 transitions. [2021-11-23 17:16:03,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-11-23 17:16:03,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:03,460 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:16:03,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:03,676 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (5)] Ended with exit code 0 [2021-11-23 17:16:03,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:03,876 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:03,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:03,877 INFO L85 PathProgramCache]: Analyzing trace with hash -636882210, now seen corresponding path program 1 times [2021-11-23 17:16:03,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:03,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1723162880] [2021-11-23 17:16:03,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:03,882 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:03,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:03,883 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:03,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:16:04,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:04,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:16:04,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:04,843 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 128 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:16:04,844 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:04,844 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:04,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1723162880] [2021-11-23 17:16:04,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1723162880] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:04,845 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:04,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:16:04,845 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074016300] [2021-11-23 17:16:04,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:04,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:16:04,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:04,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:16:04,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:16:04,848 INFO L87 Difference]: Start difference. First operand 1320 states and 1441 transitions. Second operand has 3 states, 3 states have (on average 74.66666666666667) internal successors, (224), 2 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:09,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:09,198 INFO L93 Difference]: Finished difference Result 3296 states and 3553 transitions. [2021-11-23 17:16:09,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:16:09,212 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 74.66666666666667) internal successors, (224), 2 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 257 [2021-11-23 17:16:09,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:09,225 INFO L225 Difference]: With dead ends: 3296 [2021-11-23 17:16:09,226 INFO L226 Difference]: Without dead ends: 1978 [2021-11-23 17:16:09,228 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 255 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 17:16:09,235 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 236 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 760 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:09,236 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [236 Valid, 100 Invalid, 760 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 756 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2021-11-23 17:16:09,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1978 states. [2021-11-23 17:16:09,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1978 to 1978. [2021-11-23 17:16:09,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1978 states, 1977 states have (on average 1.0662620131512393) internal successors, (2108), 1977 states have internal predecessors, (2108), 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 17:16:09,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1978 states to 1978 states and 2108 transitions. [2021-11-23 17:16:09,294 INFO L78 Accepts]: Start accepts. Automaton has 1978 states and 2108 transitions. Word has length 257 [2021-11-23 17:16:09,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:09,296 INFO L470 AbstractCegarLoop]: Abstraction has 1978 states and 2108 transitions. [2021-11-23 17:16:09,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 74.66666666666667) internal successors, (224), 2 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:09,297 INFO L276 IsEmpty]: Start isEmpty. Operand 1978 states and 2108 transitions. [2021-11-23 17:16:09,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2021-11-23 17:16:09,313 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:09,314 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:16:09,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:09,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:09,531 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:09,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:09,531 INFO L85 PathProgramCache]: Analyzing trace with hash -365096555, now seen corresponding path program 1 times [2021-11-23 17:16:09,535 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:09,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [888275242] [2021-11-23 17:16:09,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:09,536 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:09,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:09,537 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:09,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:16:09,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:09,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:16:09,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:11,903 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 191 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:11,904 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:11,904 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:11,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [888275242] [2021-11-23 17:16:11,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [888275242] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:11,904 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:11,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:16:11,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448800872] [2021-11-23 17:16:11,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:11,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:16:11,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:11,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:16:11,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:16:11,907 INFO L87 Difference]: Start difference. First operand 1978 states and 2108 transitions. Second operand has 4 states, 4 states have (on average 99.0) internal successors, (396), 3 states have internal predecessors, (396), 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 17:16:17,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:17,400 INFO L93 Difference]: Finished difference Result 3296 states and 3547 transitions. [2021-11-23 17:16:17,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:16:17,410 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 99.0) internal successors, (396), 3 states have internal predecessors, (396), 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 396 [2021-11-23 17:16:17,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:17,422 INFO L225 Difference]: With dead ends: 3296 [2021-11-23 17:16:17,422 INFO L226 Difference]: Without dead ends: 1978 [2021-11-23 17:16:17,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 393 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:16:17,425 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 303 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 1499 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 1503 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:17,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 115 Invalid, 1503 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1499 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2021-11-23 17:16:17,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1978 states. [2021-11-23 17:16:17,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1978 to 1978. [2021-11-23 17:16:17,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1978 states, 1977 states have (on average 1.0637329286798178) internal successors, (2103), 1977 states have internal predecessors, (2103), 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 17:16:17,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1978 states to 1978 states and 2103 transitions. [2021-11-23 17:16:17,497 INFO L78 Accepts]: Start accepts. Automaton has 1978 states and 2103 transitions. Word has length 396 [2021-11-23 17:16:17,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:17,498 INFO L470 AbstractCegarLoop]: Abstraction has 1978 states and 2103 transitions. [2021-11-23 17:16:17,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 99.0) internal successors, (396), 3 states have internal predecessors, (396), 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 17:16:17,498 INFO L276 IsEmpty]: Start isEmpty. Operand 1978 states and 2103 transitions. [2021-11-23 17:16:17,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2021-11-23 17:16:17,509 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:17,510 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, 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, 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] [2021-11-23 17:16:17,521 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-11-23 17:16:17,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:17,722 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:17,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:17,723 INFO L85 PathProgramCache]: Analyzing trace with hash 1509060949, now seen corresponding path program 1 times [2021-11-23 17:16:17,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:17,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [200664223] [2021-11-23 17:16:17,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:17,728 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:17,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:17,729 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:17,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:16:17,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:17,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:16:17,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:20,026 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 101 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:20,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:22,441 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 321 proven. 0 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-23 17:16:22,441 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:22,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [200664223] [2021-11-23 17:16:22,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [200664223] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 17:16:22,442 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 17:16:22,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-23 17:16:22,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99162149] [2021-11-23 17:16:22,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:22,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:16:22,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:22,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:16:22,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:16:22,444 INFO L87 Difference]: Start difference. First operand 1978 states and 2103 transitions. Second operand has 3 states, 3 states have (on average 135.33333333333334) internal successors, (406), 3 states have internal predecessors, (406), 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 17:16:35,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:35,935 INFO L93 Difference]: Finished difference Result 3954 states and 4283 transitions. [2021-11-23 17:16:35,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:16:35,939 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 135.33333333333334) internal successors, (406), 3 states have internal predecessors, (406), 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 500 [2021-11-23 17:16:35,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:35,956 INFO L225 Difference]: With dead ends: 3954 [2021-11-23 17:16:35,956 INFO L226 Difference]: Without dead ends: 2636 [2021-11-23 17:16:35,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 998 GetRequests, 994 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:16:35,960 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 209 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 748 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 748 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:35,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 25 Invalid, 890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 748 Invalid, 0 Unknown, 0 Unchecked, 13.4s Time] [2021-11-23 17:16:35,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2636 states. [2021-11-23 17:16:36,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2636 to 2636. [2021-11-23 17:16:36,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2636 states, 2635 states have (on average 1.0740037950664136) internal successors, (2830), 2635 states have internal predecessors, (2830), 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 17:16:36,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2636 states to 2636 states and 2830 transitions. [2021-11-23 17:16:36,032 INFO L78 Accepts]: Start accepts. Automaton has 2636 states and 2830 transitions. Word has length 500 [2021-11-23 17:16:36,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:36,036 INFO L470 AbstractCegarLoop]: Abstraction has 2636 states and 2830 transitions. [2021-11-23 17:16:36,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 135.33333333333334) internal successors, (406), 3 states have internal predecessors, (406), 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 17:16:36,037 INFO L276 IsEmpty]: Start isEmpty. Operand 2636 states and 2830 transitions. [2021-11-23 17:16:36,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 619 [2021-11-23 17:16:36,061 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:36,062 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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:16:36,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:36,278 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:36,279 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:36,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:36,279 INFO L85 PathProgramCache]: Analyzing trace with hash 1456488438, now seen corresponding path program 1 times [2021-11-23 17:16:36,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:36,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [334787417] [2021-11-23 17:16:36,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:36,286 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:36,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:36,288 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:36,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:16:36,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:36,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 675 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:16:36,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:40,248 INFO L134 CoverageAnalysis]: Checked inductivity of 530 backedges. 254 proven. 0 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-11-23 17:16:40,249 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:40,249 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:40,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [334787417] [2021-11-23 17:16:40,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [334787417] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:40,249 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:40,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:16:40,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757256554] [2021-11-23 17:16:40,250 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:40,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:16:40,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:40,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:16:40,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:16:40,253 INFO L87 Difference]: Start difference. First operand 2636 states and 2830 transitions. Second operand has 3 states, 3 states have (on average 114.66666666666667) internal successors, (344), 2 states have internal predecessors, (344), 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 17:16:44,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:44,461 INFO L93 Difference]: Finished difference Result 4612 states and 4996 transitions. [2021-11-23 17:16:44,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:16:44,463 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 114.66666666666667) internal successors, (344), 2 states have internal predecessors, (344), 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 618 [2021-11-23 17:16:44,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:44,480 INFO L225 Difference]: With dead ends: 4612 [2021-11-23 17:16:44,480 INFO L226 Difference]: Without dead ends: 2636 [2021-11-23 17:16:44,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 616 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 17:16:44,485 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 85 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 750 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 751 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 750 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:44,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 106 Invalid, 751 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 750 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2021-11-23 17:16:44,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2636 states. [2021-11-23 17:16:44,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2636 to 2636. [2021-11-23 17:16:44,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2636 states, 2635 states have (on average 1.0736242884250475) internal successors, (2829), 2635 states have internal predecessors, (2829), 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 17:16:44,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2636 states to 2636 states and 2829 transitions. [2021-11-23 17:16:44,555 INFO L78 Accepts]: Start accepts. Automaton has 2636 states and 2829 transitions. Word has length 618 [2021-11-23 17:16:44,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:44,557 INFO L470 AbstractCegarLoop]: Abstraction has 2636 states and 2829 transitions. [2021-11-23 17:16:44,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 114.66666666666667) internal successors, (344), 2 states have internal predecessors, (344), 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 17:16:44,558 INFO L276 IsEmpty]: Start isEmpty. Operand 2636 states and 2829 transitions. [2021-11-23 17:16:44,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 629 [2021-11-23 17:16:44,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:44,567 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, 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, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:44,591 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-23 17:16:44,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:44,781 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:44,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:44,781 INFO L85 PathProgramCache]: Analyzing trace with hash -405770503, now seen corresponding path program 1 times [2021-11-23 17:16:44,784 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:44,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [733102925] [2021-11-23 17:16:44,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:44,784 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:44,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:44,785 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:44,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:16:45,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:45,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:16:45,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:50,721 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 382 proven. 349 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:16:50,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:56,256 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 596 proven. 40 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2021-11-23 17:16:56,257 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:56,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [733102925] [2021-11-23 17:16:56,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [733102925] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:56,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1859199085] [2021-11-23 17:16:56,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:56,257 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:56,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:56,258 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:56,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-23 17:16:56,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:56,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:16:56,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:58,517 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 416 proven. 0 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2021-11-23 17:16:58,517 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:58,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1859199085] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:58,517 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:16:58,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 4] total 13 [2021-11-23 17:16:58,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002678973] [2021-11-23 17:16:58,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:58,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:16:58,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:58,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:16:58,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2021-11-23 17:16:58,521 INFO L87 Difference]: Start difference. First operand 2636 states and 2829 transitions. Second operand has 7 states, 7 states have (on average 53.714285714285715) internal successors, (376), 7 states have internal predecessors, (376), 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 17:17:07,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:07,467 INFO L93 Difference]: Finished difference Result 5928 states and 6537 transitions. [2021-11-23 17:17:07,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:17:07,468 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 53.714285714285715) internal successors, (376), 7 states have internal predecessors, (376), 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 628 [2021-11-23 17:17:07,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:07,488 INFO L225 Difference]: With dead ends: 5928 [2021-11-23 17:17:07,488 INFO L226 Difference]: Without dead ends: 3952 [2021-11-23 17:17:07,491 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1883 GetRequests, 1871 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-11-23 17:17:07,492 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 884 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 2206 mSolverCounterSat, 336 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 884 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 2542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 336 IncrementalHoareTripleChecker+Valid, 2206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:07,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [884 Valid, 31 Invalid, 2542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [336 Valid, 2206 Invalid, 0 Unknown, 0 Unchecked, 8.8s Time] [2021-11-23 17:17:07,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3952 states. [2021-11-23 17:17:07,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3952 to 3952. [2021-11-23 17:17:07,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3952 states, 3951 states have (on average 1.0771956466717287) internal successors, (4256), 3951 states have internal predecessors, (4256), 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 17:17:07,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3952 states to 3952 states and 4256 transitions. [2021-11-23 17:17:07,571 INFO L78 Accepts]: Start accepts. Automaton has 3952 states and 4256 transitions. Word has length 628 [2021-11-23 17:17:07,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:07,573 INFO L470 AbstractCegarLoop]: Abstraction has 3952 states and 4256 transitions. [2021-11-23 17:17:07,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 53.714285714285715) internal successors, (376), 7 states have internal predecessors, (376), 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 17:17:07,573 INFO L276 IsEmpty]: Start isEmpty. Operand 3952 states and 4256 transitions. [2021-11-23 17:17:07,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 663 [2021-11-23 17:17:07,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:07,582 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, 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, 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, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:17:07,584 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (11)] Ended with exit code 0 [2021-11-23 17:17:07,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:07,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:07,984 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:07,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:07,985 INFO L85 PathProgramCache]: Analyzing trace with hash -628252860, now seen corresponding path program 1 times [2021-11-23 17:17:07,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:07,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [385430952] [2021-11-23 17:17:07,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:07,988 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:07,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:07,989 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:07,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:17:08,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:08,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:08,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:12,567 INFO L134 CoverageAnalysis]: Checked inductivity of 835 backedges. 9 proven. 792 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:17:12,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:16,983 INFO L134 CoverageAnalysis]: Checked inductivity of 835 backedges. 223 proven. 483 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2021-11-23 17:17:16,983 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:16,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [385430952] [2021-11-23 17:17:16,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [385430952] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:16,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [213332415] [2021-11-23 17:17:16,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:16,984 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:16,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:16,992 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:16,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 17:17:17,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:17,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:17:17,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:19,962 INFO L134 CoverageAnalysis]: Checked inductivity of 835 backedges. 400 proven. 0 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2021-11-23 17:17:19,963 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:19,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [213332415] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:19,963 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:17:19,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6, 5] total 14 [2021-11-23 17:17:19,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532791283] [2021-11-23 17:17:19,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:19,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:17:19,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:19,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:17:19,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-11-23 17:17:19,967 INFO L87 Difference]: Start difference. First operand 3952 states and 4256 transitions. Second operand has 7 states, 7 states have (on average 54.57142857142857) internal successors, (382), 7 states have internal predecessors, (382), 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 17:17:25,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:25,050 INFO L93 Difference]: Finished difference Result 4941 states and 5303 transitions. [2021-11-23 17:17:25,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:17:25,064 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 54.57142857142857) internal successors, (382), 7 states have internal predecessors, (382), 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 662 [2021-11-23 17:17:25,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:25,091 INFO L225 Difference]: With dead ends: 4941 [2021-11-23 17:17:25,091 INFO L226 Difference]: Without dead ends: 4939 [2021-11-23 17:17:25,092 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1983 GetRequests, 1971 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-11-23 17:17:25,093 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 2036 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2036 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 948 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:25,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2036 Valid, 12 Invalid, 948 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 756 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2021-11-23 17:17:25,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4939 states. [2021-11-23 17:17:25,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4939 to 4281. [2021-11-23 17:17:25,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4281 states, 4280 states have (on average 1.0768691588785047) internal successors, (4609), 4280 states have internal predecessors, (4609), 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 17:17:25,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4281 states to 4281 states and 4609 transitions. [2021-11-23 17:17:25,191 INFO L78 Accepts]: Start accepts. Automaton has 4281 states and 4609 transitions. Word has length 662 [2021-11-23 17:17:25,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:25,192 INFO L470 AbstractCegarLoop]: Abstraction has 4281 states and 4609 transitions. [2021-11-23 17:17:25,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 54.57142857142857) internal successors, (382), 7 states have internal predecessors, (382), 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 17:17:25,193 INFO L276 IsEmpty]: Start isEmpty. Operand 4281 states and 4609 transitions. [2021-11-23 17:17:25,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 897 [2021-11-23 17:17:25,208 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:25,209 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, 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, 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, 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, 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] [2021-11-23 17:17:25,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:25,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:25,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:25,625 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:25,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:25,626 INFO L85 PathProgramCache]: Analyzing trace with hash -1949645550, now seen corresponding path program 1 times [2021-11-23 17:17:25,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:25,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1821152366] [2021-11-23 17:17:25,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:25,632 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:25,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:25,634 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:25,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 17:17:26,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:26,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 976 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:26,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:30,944 INFO L134 CoverageAnalysis]: Checked inductivity of 1559 backedges. 771 proven. 754 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:17:30,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:35,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1559 backedges. 985 proven. 445 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2021-11-23 17:17:35,711 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:35,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1821152366] [2021-11-23 17:17:35,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1821152366] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:35,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [744883480] [2021-11-23 17:17:35,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:35,712 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:35,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:35,713 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:35,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-23 17:17:36,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:36,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 976 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:17:36,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:38,186 INFO L134 CoverageAnalysis]: Checked inductivity of 1559 backedges. 765 proven. 0 refuted. 0 times theorem prover too weak. 794 trivial. 0 not checked. [2021-11-23 17:17:38,186 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:17:38,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [744883480] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:17:38,187 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:17:38,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 5] total 11 [2021-11-23 17:17:38,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014945133] [2021-11-23 17:17:38,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:17:38,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:17:38,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:38,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:17:38,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 17:17:38,190 INFO L87 Difference]: Start difference. First operand 4281 states and 4609 transitions. Second operand has 4 states, 4 states have (on average 113.5) internal successors, (454), 4 states have internal predecessors, (454), 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 17:17:44,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:44,879 INFO L93 Difference]: Finished difference Result 8929 states and 9739 transitions. [2021-11-23 17:17:44,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:17:44,880 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 113.5) internal successors, (454), 4 states have internal predecessors, (454), 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 896 [2021-11-23 17:17:44,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:44,903 INFO L225 Difference]: With dead ends: 8929 [2021-11-23 17:17:44,903 INFO L226 Difference]: Without dead ends: 5308 [2021-11-23 17:17:44,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2687 GetRequests, 2677 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-11-23 17:17:44,909 INFO L933 BasicCegarLoop]: 417 mSDtfsCounter, 358 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 1211 mSolverCounterSat, 207 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 358 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 1418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 207 IncrementalHoareTripleChecker+Valid, 1211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:44,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [358 Valid, 427 Invalid, 1418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [207 Valid, 1211 Invalid, 0 Unknown, 0 Unchecked, 6.6s Time] [2021-11-23 17:17:44,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5308 states. [2021-11-23 17:17:45,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5308 to 5268. [2021-11-23 17:17:45,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5268 states, 5267 states have (on average 1.0573381431554965) internal successors, (5569), 5267 states have internal predecessors, (5569), 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 17:17:45,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5268 states to 5268 states and 5569 transitions. [2021-11-23 17:17:45,037 INFO L78 Accepts]: Start accepts. Automaton has 5268 states and 5569 transitions. Word has length 896 [2021-11-23 17:17:45,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:45,038 INFO L470 AbstractCegarLoop]: Abstraction has 5268 states and 5569 transitions. [2021-11-23 17:17:45,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 113.5) internal successors, (454), 4 states have internal predecessors, (454), 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 17:17:45,039 INFO L276 IsEmpty]: Start isEmpty. Operand 5268 states and 5569 transitions. [2021-11-23 17:17:45,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1107 [2021-11-23 17:17:45,061 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:45,062 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 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, 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, 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] [2021-11-23 17:17:45,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:45,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:45,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:17:45,466 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:45,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:45,467 INFO L85 PathProgramCache]: Analyzing trace with hash 2082394327, now seen corresponding path program 1 times [2021-11-23 17:17:45,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:45,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [993305146] [2021-11-23 17:17:45,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:45,473 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:45,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:45,475 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:45,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:17:45,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:45,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 1204 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:17:45,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:52,318 INFO L134 CoverageAnalysis]: Checked inductivity of 2784 backedges. 1588 proven. 349 refuted. 0 times theorem prover too weak. 847 trivial. 0 not checked. [2021-11-23 17:17:52,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:58,971 INFO L134 CoverageAnalysis]: Checked inductivity of 2784 backedges. 1802 proven. 40 refuted. 0 times theorem prover too weak. 942 trivial. 0 not checked. [2021-11-23 17:17:58,972 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:58,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [993305146] [2021-11-23 17:17:58,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [993305146] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:58,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [889078587] [2021-11-23 17:17:58,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:58,972 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:58,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:58,973 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:58,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 17:17:59,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:59,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 1204 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:17:59,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:01,432 INFO L134 CoverageAnalysis]: Checked inductivity of 2784 backedges. 1842 proven. 0 refuted. 0 times theorem prover too weak. 942 trivial. 0 not checked. [2021-11-23 17:18:01,432 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:01,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [889078587] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:01,432 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:18:01,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 4] total 9 [2021-11-23 17:18:01,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107541083] [2021-11-23 17:18:01,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:01,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:01,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:01,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:01,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:18:01,437 INFO L87 Difference]: Start difference. First operand 5268 states and 5569 transitions. Second operand has 3 states, 3 states have (on average 198.0) internal successors, (594), 3 states have internal predecessors, (594), 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 17:18:06,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:06,393 INFO L93 Difference]: Finished difference Result 11192 states and 11885 transitions. [2021-11-23 17:18:06,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:18:06,394 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 198.0) internal successors, (594), 3 states have internal predecessors, (594), 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 1106 [2021-11-23 17:18:06,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:06,424 INFO L225 Difference]: With dead ends: 11192 [2021-11-23 17:18:06,424 INFO L226 Difference]: Without dead ends: 6584 [2021-11-23 17:18:06,430 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3315 GetRequests, 3308 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:18:06,431 INFO L933 BasicCegarLoop]: 418 mSDtfsCounter, 171 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 753 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 803 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 753 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:06,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 424 Invalid, 803 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 753 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2021-11-23 17:18:06,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6584 states. [2021-11-23 17:18:06,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6584 to 6584. [2021-11-23 17:18:06,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6584 states, 6583 states have (on average 1.05134437186693) internal successors, (6921), 6583 states have internal predecessors, (6921), 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 17:18:06,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6584 states to 6584 states and 6921 transitions. [2021-11-23 17:18:06,580 INFO L78 Accepts]: Start accepts. Automaton has 6584 states and 6921 transitions. Word has length 1106 [2021-11-23 17:18:06,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:06,581 INFO L470 AbstractCegarLoop]: Abstraction has 6584 states and 6921 transitions. [2021-11-23 17:18:06,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 198.0) internal successors, (594), 3 states have internal predecessors, (594), 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 17:18:06,582 INFO L276 IsEmpty]: Start isEmpty. Operand 6584 states and 6921 transitions. [2021-11-23 17:18:06,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1222 [2021-11-23 17:18:06,606 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:06,608 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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, 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, 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, 1, 1, 1, 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 17:18:06,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:06,830 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-11-23 17:18:07,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:07,029 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:07,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:07,030 INFO L85 PathProgramCache]: Analyzing trace with hash -996091284, now seen corresponding path program 1 times [2021-11-23 17:18:07,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:07,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1156133800] [2021-11-23 17:18:07,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:07,039 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:07,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:07,040 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:07,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:18:07,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:07,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 1319 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:18:07,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:11,299 INFO L134 CoverageAnalysis]: Checked inductivity of 3158 backedges. 1808 proven. 647 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2021-11-23 17:18:11,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:29,933 INFO L134 CoverageAnalysis]: Checked inductivity of 3158 backedges. 1808 proven. 647 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2021-11-23 17:18:29,934 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:29,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1156133800] [2021-11-23 17:18:29,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1156133800] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:29,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [513087817] [2021-11-23 17:18:29,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:29,935 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:29,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:29,936 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:29,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 17:18:30,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:30,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 1319 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:18:30,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:32,165 INFO L134 CoverageAnalysis]: Checked inductivity of 3158 backedges. 2138 proven. 0 refuted. 0 times theorem prover too weak. 1020 trivial. 0 not checked. [2021-11-23 17:18:32,165 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:18:32,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [513087817] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:18:32,165 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:18:32,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5] total 9 [2021-11-23 17:18:32,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699752296] [2021-11-23 17:18:32,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:18:32,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:18:32,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:32,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:18:32,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:18:32,169 INFO L87 Difference]: Start difference. First operand 6584 states and 6921 transitions. Second operand has 3 states, 3 states have (on average 179.33333333333334) internal successors, (538), 3 states have internal predecessors, (538), 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 17:18:36,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:36,663 INFO L93 Difference]: Finished difference Result 13495 states and 14253 transitions. [2021-11-23 17:18:36,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:18:36,664 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 179.33333333333334) internal successors, (538), 3 states have internal predecessors, (538), 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 1221 [2021-11-23 17:18:36,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:36,675 INFO L225 Difference]: With dead ends: 13495 [2021-11-23 17:18:36,675 INFO L226 Difference]: Without dead ends: 7571 [2021-11-23 17:18:36,680 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3660 GetRequests, 3653 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:18:36,681 INFO L933 BasicCegarLoop]: 410 mSDtfsCounter, 223 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 416 SdHoareTripleChecker+Invalid, 810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:36,681 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 416 Invalid, 810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 762 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2021-11-23 17:18:36,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7571 states. [2021-11-23 17:18:36,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7571 to 7571. [2021-11-23 17:18:36,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7571 states, 7570 states have (on average 1.048216644649934) internal successors, (7935), 7570 states have internal predecessors, (7935), 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 17:18:36,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7571 states to 7571 states and 7935 transitions. [2021-11-23 17:18:36,793 INFO L78 Accepts]: Start accepts. Automaton has 7571 states and 7935 transitions. Word has length 1221 [2021-11-23 17:18:36,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:36,794 INFO L470 AbstractCegarLoop]: Abstraction has 7571 states and 7935 transitions. [2021-11-23 17:18:36,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 179.33333333333334) internal successors, (538), 3 states have internal predecessors, (538), 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 17:18:36,795 INFO L276 IsEmpty]: Start isEmpty. Operand 7571 states and 7935 transitions. [2021-11-23 17:18:36,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1253 [2021-11-23 17:18:36,820 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:36,821 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:18:36,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:37,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:37,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:37,237 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:37,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:37,237 INFO L85 PathProgramCache]: Analyzing trace with hash -1295800681, now seen corresponding path program 1 times [2021-11-23 17:18:37,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:37,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [205937512] [2021-11-23 17:18:37,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:37,242 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:37,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:37,243 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:37,248 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:18:37,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:37,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 1357 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:18:37,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:40,729 INFO L134 CoverageAnalysis]: Checked inductivity of 3510 backedges. 1902 proven. 249 refuted. 0 times theorem prover too weak. 1359 trivial. 0 not checked. [2021-11-23 17:18:40,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:00,764 INFO L134 CoverageAnalysis]: Checked inductivity of 3510 backedges. 1902 proven. 249 refuted. 0 times theorem prover too weak. 1359 trivial. 0 not checked. [2021-11-23 17:19:00,765 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:00,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [205937512] [2021-11-23 17:19:00,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [205937512] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:00,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [961919775] [2021-11-23 17:19:00,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:00,765 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:00,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:00,766 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:00,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-23 17:19:01,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:01,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 1357 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:19:01,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:03,316 INFO L134 CoverageAnalysis]: Checked inductivity of 3510 backedges. 2364 proven. 0 refuted. 0 times theorem prover too weak. 1146 trivial. 0 not checked. [2021-11-23 17:19:03,316 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:19:03,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [961919775] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:19:03,317 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:19:03,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 17:19:03,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922911962] [2021-11-23 17:19:03,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:19:03,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:19:03,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:03,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:19:03,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:19:03,320 INFO L87 Difference]: Start difference. First operand 7571 states and 7935 transitions. Second operand has 3 states, 3 states have (on average 179.66666666666666) internal successors, (539), 3 states have internal predecessors, (539), 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 17:19:08,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:08,727 INFO L93 Difference]: Finished difference Result 16456 states and 17280 transitions. [2021-11-23 17:19:08,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:19:08,727 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 179.66666666666666) internal successors, (539), 3 states have internal predecessors, (539), 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 1252 [2021-11-23 17:19:08,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:08,751 INFO L225 Difference]: With dead ends: 16456 [2021-11-23 17:19:08,751 INFO L226 Difference]: Without dead ends: 9545 [2021-11-23 17:19:08,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3753 GetRequests, 3748 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:19:08,762 INFO L933 BasicCegarLoop]: 424 mSDtfsCounter, 220 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 750 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 430 SdHoareTripleChecker+Invalid, 809 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 750 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:08,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 430 Invalid, 809 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 750 Invalid, 0 Unknown, 0 Unchecked, 5.3s Time] [2021-11-23 17:19:08,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9545 states. [2021-11-23 17:19:08,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9545 to 9216. [2021-11-23 17:19:08,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9216 states, 9215 states have (on average 1.0375474769397721) internal successors, (9561), 9215 states have internal predecessors, (9561), 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 17:19:08,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9216 states to 9216 states and 9561 transitions. [2021-11-23 17:19:08,919 INFO L78 Accepts]: Start accepts. Automaton has 9216 states and 9561 transitions. Word has length 1252 [2021-11-23 17:19:08,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:08,920 INFO L470 AbstractCegarLoop]: Abstraction has 9216 states and 9561 transitions. [2021-11-23 17:19:08,920 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 179.66666666666666) internal successors, (539), 3 states have internal predecessors, (539), 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 17:19:08,921 INFO L276 IsEmpty]: Start isEmpty. Operand 9216 states and 9561 transitions. [2021-11-23 17:19:09,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1254 [2021-11-23 17:19:09,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:09,019 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:19:09,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:09,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:09,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:09,422 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:09,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:09,423 INFO L85 PathProgramCache]: Analyzing trace with hash -830419840, now seen corresponding path program 1 times [2021-11-23 17:19:09,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:09,429 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [388697913] [2021-11-23 17:19:09,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:09,429 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:09,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:09,430 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:09,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:19:09,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:09,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 1360 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:19:09,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:13,276 INFO L134 CoverageAnalysis]: Checked inductivity of 3517 backedges. 1905 proven. 249 refuted. 0 times theorem prover too weak. 1363 trivial. 0 not checked. [2021-11-23 17:19:13,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:34,743 INFO L134 CoverageAnalysis]: Checked inductivity of 3517 backedges. 1905 proven. 249 refuted. 0 times theorem prover too weak. 1363 trivial. 0 not checked. [2021-11-23 17:19:34,744 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:34,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [388697913] [2021-11-23 17:19:34,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [388697913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:34,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1256977405] [2021-11-23 17:19:34,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:34,745 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:34,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:34,752 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:34,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-23 17:19:35,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:35,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 1360 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:19:35,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:37,032 INFO L134 CoverageAnalysis]: Checked inductivity of 3517 backedges. 1191 proven. 0 refuted. 0 times theorem prover too weak. 2326 trivial. 0 not checked. [2021-11-23 17:19:37,033 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:19:37,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1256977405] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:19:37,033 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:19:37,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 17:19:37,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119791797] [2021-11-23 17:19:37,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:19:37,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:19:37,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:19:37,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:19:37,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:19:37,036 INFO L87 Difference]: Start difference. First operand 9216 states and 9561 transitions. Second operand has 3 states, 3 states have (on average 149.66666666666666) internal successors, (449), 3 states have internal predecessors, (449), 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 17:19:42,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:19:42,280 INFO L93 Difference]: Finished difference Result 20075 states and 20878 transitions. [2021-11-23 17:19:42,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:19:42,282 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 149.66666666666666) internal successors, (449), 3 states have internal predecessors, (449), 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 1253 [2021-11-23 17:19:42,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:19:42,305 INFO L225 Difference]: With dead ends: 20075 [2021-11-23 17:19:42,305 INFO L226 Difference]: Without dead ends: 9874 [2021-11-23 17:19:42,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3756 GetRequests, 3751 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:19:42,316 INFO L933 BasicCegarLoop]: 405 mSDtfsCounter, 172 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 835 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:19:42,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [172 Valid, 410 Invalid, 835 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 756 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2021-11-23 17:19:42,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9874 states. [2021-11-23 17:19:42,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9874 to 9874. [2021-11-23 17:19:42,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9874 states, 9873 states have (on average 1.026537020155981) internal successors, (10135), 9873 states have internal predecessors, (10135), 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 17:19:42,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9874 states to 9874 states and 10135 transitions. [2021-11-23 17:19:42,518 INFO L78 Accepts]: Start accepts. Automaton has 9874 states and 10135 transitions. Word has length 1253 [2021-11-23 17:19:42,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:19:42,519 INFO L470 AbstractCegarLoop]: Abstraction has 9874 states and 10135 transitions. [2021-11-23 17:19:42,520 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 149.66666666666666) internal successors, (449), 3 states have internal predecessors, (449), 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 17:19:42,520 INFO L276 IsEmpty]: Start isEmpty. Operand 9874 states and 10135 transitions. [2021-11-23 17:19:42,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1793 [2021-11-23 17:19:42,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:19:42,559 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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, 6, 6, 6, 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, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 17:19:42,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:42,777 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:19:42,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:19:42,965 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:19:42,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:19:42,966 INFO L85 PathProgramCache]: Analyzing trace with hash 63683835, now seen corresponding path program 1 times [2021-11-23 17:19:42,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:19:42,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1842617814] [2021-11-23 17:19:42,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:42,973 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:19:42,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:19:42,974 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:19:42,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:19:43,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:43,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 1918 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:19:43,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:47,594 INFO L134 CoverageAnalysis]: Checked inductivity of 6196 backedges. 3029 proven. 249 refuted. 0 times theorem prover too weak. 2918 trivial. 0 not checked. [2021-11-23 17:19:47,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:09,687 INFO L134 CoverageAnalysis]: Checked inductivity of 6196 backedges. 3029 proven. 249 refuted. 0 times theorem prover too weak. 2918 trivial. 0 not checked. [2021-11-23 17:20:09,687 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:09,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1842617814] [2021-11-23 17:20:09,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1842617814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:09,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1906428205] [2021-11-23 17:20:09,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:09,688 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:09,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:09,690 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:09,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 17:20:11,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:11,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 1918 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:20:11,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:15,593 INFO L134 CoverageAnalysis]: Checked inductivity of 6196 backedges. 3631 proven. 0 refuted. 0 times theorem prover too weak. 2565 trivial. 0 not checked. [2021-11-23 17:20:15,593 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:15,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1906428205] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:15,593 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:20:15,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3] total 8 [2021-11-23 17:20:15,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147110543] [2021-11-23 17:20:15,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:15,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:20:15,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:15,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:20:15,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:20:15,597 INFO L87 Difference]: Start difference. First operand 9874 states and 10135 transitions. Second operand has 4 states, 4 states have (on average 196.25) internal successors, (785), 4 states have internal predecessors, (785), 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 17:20:19,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:19,972 INFO L93 Difference]: Finished difference Result 19091 states and 19609 transitions. [2021-11-23 17:20:19,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:20:19,976 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 196.25) internal successors, (785), 4 states have internal predecessors, (785), 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 1792 [2021-11-23 17:20:19,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:19,997 INFO L225 Difference]: With dead ends: 19091 [2021-11-23 17:20:19,998 INFO L226 Difference]: Without dead ends: 9877 [2021-11-23 17:20:20,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5373 GetRequests, 5367 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:20:20,006 INFO L933 BasicCegarLoop]: 425 mSDtfsCounter, 281 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 914 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 433 SdHoareTripleChecker+Invalid, 919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 914 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:20,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 433 Invalid, 919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 914 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2021-11-23 17:20:20,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9877 states. [2021-11-23 17:20:20,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9877 to 9874. [2021-11-23 17:20:20,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9874 states, 9873 states have (on average 1.026131874810088) internal successors, (10131), 9873 states have internal predecessors, (10131), 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 17:20:20,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9874 states to 9874 states and 10131 transitions. [2021-11-23 17:20:20,140 INFO L78 Accepts]: Start accepts. Automaton has 9874 states and 10131 transitions. Word has length 1792 [2021-11-23 17:20:20,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:20,142 INFO L470 AbstractCegarLoop]: Abstraction has 9874 states and 10131 transitions. [2021-11-23 17:20:20,142 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 196.25) internal successors, (785), 4 states have internal predecessors, (785), 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 17:20:20,142 INFO L276 IsEmpty]: Start isEmpty. Operand 9874 states and 10131 transitions. [2021-11-23 17:20:20,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1879 [2021-11-23 17:20:20,236 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:20,237 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:20:20,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:20,465 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:20,651 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:20:20,652 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:20,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:20,653 INFO L85 PathProgramCache]: Analyzing trace with hash -2025601451, now seen corresponding path program 1 times [2021-11-23 17:20:20,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:20,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [236007361] [2021-11-23 17:20:20,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:20,659 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:20,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:20,660 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:20,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 17:20:21,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:21,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 1999 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:20:21,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:25,405 INFO L134 CoverageAnalysis]: Checked inductivity of 6973 backedges. 3307 proven. 249 refuted. 0 times theorem prover too weak. 3417 trivial. 0 not checked. [2021-11-23 17:20:25,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 6973 backedges. 3307 proven. 249 refuted. 0 times theorem prover too weak. 3417 trivial. 0 not checked. [2021-11-23 17:20:47,925 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:47,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [236007361] [2021-11-23 17:20:47,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [236007361] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:47,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [499809232] [2021-11-23 17:20:47,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:47,926 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:47,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:47,942 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:47,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-23 17:20:48,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:48,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 1999 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:20:48,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:52,148 INFO L134 CoverageAnalysis]: Checked inductivity of 6973 backedges. 1700 proven. 0 refuted. 0 times theorem prover too weak. 5273 trivial. 0 not checked. [2021-11-23 17:20:52,148 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:52,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [499809232] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:52,149 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:20:52,149 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3] total 8 [2021-11-23 17:20:52,150 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489764874] [2021-11-23 17:20:52,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:52,151 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:20:52,151 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:52,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:20:52,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:20:52,152 INFO L87 Difference]: Start difference. First operand 9874 states and 10131 transitions. Second operand has 4 states, 4 states have (on average 121.25) internal successors, (485), 4 states have internal predecessors, (485), 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 17:20:59,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:59,519 INFO L93 Difference]: Finished difference Result 22472 states and 23085 transitions. [2021-11-23 17:20:59,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:20:59,523 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 121.25) internal successors, (485), 4 states have internal predecessors, (485), 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 1878 [2021-11-23 17:20:59,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:59,544 INFO L225 Difference]: With dead ends: 22472 [2021-11-23 17:20:59,544 INFO L226 Difference]: Without dead ends: 13258 [2021-11-23 17:20:59,553 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5633 GetRequests, 5626 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:20:59,554 INFO L933 BasicCegarLoop]: 418 mSDtfsCounter, 354 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 1230 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 428 SdHoareTripleChecker+Invalid, 1387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 1230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:59,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [354 Valid, 428 Invalid, 1387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 1230 Invalid, 0 Unknown, 0 Unchecked, 7.2s Time] [2021-11-23 17:20:59,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13258 states. [2021-11-23 17:20:59,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13258 to 12835. [2021-11-23 17:20:59,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12835 states, 12834 states have (on average 1.0236091631603552) internal successors, (13137), 12834 states have internal predecessors, (13137), 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 17:20:59,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12835 states to 12835 states and 13137 transitions. [2021-11-23 17:20:59,777 INFO L78 Accepts]: Start accepts. Automaton has 12835 states and 13137 transitions. Word has length 1878 [2021-11-23 17:20:59,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:59,779 INFO L470 AbstractCegarLoop]: Abstraction has 12835 states and 13137 transitions. [2021-11-23 17:20:59,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 121.25) internal successors, (485), 4 states have internal predecessors, (485), 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 17:20:59,780 INFO L276 IsEmpty]: Start isEmpty. Operand 12835 states and 13137 transitions. [2021-11-23 17:20:59,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1926 [2021-11-23 17:20:59,878 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:59,880 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:20:59,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:00,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:00,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:00,302 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:00,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:00,303 INFO L85 PathProgramCache]: Analyzing trace with hash -557385484, now seen corresponding path program 1 times [2021-11-23 17:21:00,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:00,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1565376771] [2021-11-23 17:21:00,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:00,311 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:00,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:00,312 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:00,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:21:01,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:01,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 2047 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:21:01,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:05,188 INFO L134 CoverageAnalysis]: Checked inductivity of 7222 backedges. 3401 proven. 249 refuted. 0 times theorem prover too weak. 3572 trivial. 0 not checked. [2021-11-23 17:21:05,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:26,312 INFO L134 CoverageAnalysis]: Checked inductivity of 7222 backedges. 3401 proven. 249 refuted. 0 times theorem prover too weak. 3572 trivial. 0 not checked. [2021-11-23 17:21:26,312 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:26,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1565376771] [2021-11-23 17:21:26,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1565376771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:26,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1586988774] [2021-11-23 17:21:26,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:26,313 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:26,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:26,314 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:26,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-23 17:21:27,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:27,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 2047 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:21:27,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:35,246 INFO L134 CoverageAnalysis]: Checked inductivity of 7222 backedges. 4785 proven. 0 refuted. 0 times theorem prover too weak. 2437 trivial. 0 not checked. [2021-11-23 17:21:35,246 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:21:35,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1586988774] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:21:35,247 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:21:35,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [3, 3] total 9 [2021-11-23 17:21:35,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617910709] [2021-11-23 17:21:35,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:21:35,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:21:35,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:35,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:21:35,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:21:35,252 INFO L87 Difference]: Start difference. First operand 12835 states and 13137 transitions. Second operand has 5 states, 5 states have (on average 153.0) internal successors, (765), 5 states have internal predecessors, (765), 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 17:21:40,980 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 17:21:41,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:41,394 INFO L93 Difference]: Finished difference Result 25016 states and 25616 transitions. [2021-11-23 17:21:41,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:21:41,398 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 153.0) internal successors, (765), 5 states have internal predecessors, (765), 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 1925 [2021-11-23 17:21:41,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:41,413 INFO L225 Difference]: With dead ends: 25016 [2021-11-23 17:21:41,413 INFO L226 Difference]: Without dead ends: 12841 [2021-11-23 17:21:41,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5772 GetRequests, 5765 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 17:21:41,423 INFO L933 BasicCegarLoop]: 421 mSDtfsCounter, 462 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 937 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 462 SdHoareTripleChecker+Valid, 429 SdHoareTripleChecker+Invalid, 953 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 937 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:41,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [462 Valid, 429 Invalid, 953 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 937 Invalid, 1 Unknown, 0 Unchecked, 6.0s Time] [2021-11-23 17:21:41,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12841 states. [2021-11-23 17:21:41,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12841 to 12835. [2021-11-23 17:21:41,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12835 states, 12834 states have (on average 1.0232974910394266) internal successors, (13133), 12834 states have internal predecessors, (13133), 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 17:21:41,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12835 states to 12835 states and 13133 transitions. [2021-11-23 17:21:41,710 INFO L78 Accepts]: Start accepts. Automaton has 12835 states and 13133 transitions. Word has length 1925 [2021-11-23 17:21:41,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:41,711 INFO L470 AbstractCegarLoop]: Abstraction has 12835 states and 13133 transitions. [2021-11-23 17:21:41,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 153.0) internal successors, (765), 5 states have internal predecessors, (765), 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 17:21:41,713 INFO L276 IsEmpty]: Start isEmpty. Operand 12835 states and 13133 transitions. [2021-11-23 17:21:41,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2158 [2021-11-23 17:21:41,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:41,763 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 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, 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, 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] [2021-11-23 17:21:41,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:41,984 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Ended with exit code 0 [2021-11-23 17:21:42,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:42,182 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:42,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:42,183 INFO L85 PathProgramCache]: Analyzing trace with hash 1712067278, now seen corresponding path program 1 times [2021-11-23 17:21:42,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:42,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2124798959] [2021-11-23 17:21:42,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:42,197 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:42,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:42,197 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:42,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 17:21:42,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:42,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 2296 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:21:43,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:47,546 INFO L134 CoverageAnalysis]: Checked inductivity of 9272 backedges. 4002 proven. 249 refuted. 0 times theorem prover too weak. 5021 trivial. 0 not checked. [2021-11-23 17:21:47,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:10,175 INFO L134 CoverageAnalysis]: Checked inductivity of 9272 backedges. 4002 proven. 249 refuted. 0 times theorem prover too weak. 5021 trivial. 0 not checked. [2021-11-23 17:22:10,175 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:10,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2124798959] [2021-11-23 17:22:10,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2124798959] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:10,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1264037967] [2021-11-23 17:22:10,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:10,178 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:10,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:10,179 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:10,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-23 17:22:12,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:12,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 2296 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:22:12,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:17,644 INFO L134 CoverageAnalysis]: Checked inductivity of 9272 backedges. 4738 proven. 776 refuted. 0 times theorem prover too weak. 3758 trivial. 0 not checked. [2021-11-23 17:22:17,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:38,452 INFO L134 CoverageAnalysis]: Checked inductivity of 9272 backedges. 4738 proven. 776 refuted. 0 times theorem prover too weak. 3758 trivial. 0 not checked. [2021-11-23 17:22:38,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1264037967] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:38,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890595457] [2021-11-23 17:22:38,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:38,453 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:38,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:38,456 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:38,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-23 17:22:39,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:39,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 2296 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:22:39,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:48,167 INFO L134 CoverageAnalysis]: Checked inductivity of 9272 backedges. 4002 proven. 249 refuted. 0 times theorem prover too weak. 5021 trivial. 0 not checked. [2021-11-23 17:22:48,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:06,802 INFO L134 CoverageAnalysis]: Checked inductivity of 9272 backedges. 4613 proven. 438 refuted. 0 times theorem prover too weak. 4221 trivial. 0 not checked. [2021-11-23 17:23:06,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890595457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:06,803 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:06,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 5, 5, 4, 8] total 17 [2021-11-23 17:23:06,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877716868] [2021-11-23 17:23:06,805 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:06,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 17:23:06,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:06,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 17:23:06,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:23:06,812 INFO L87 Difference]: Start difference. First operand 12835 states and 13133 transitions. Second operand has 17 states, 17 states have (on average 133.76470588235293) internal successors, (2274), 17 states have internal predecessors, (2274), 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 17:23:43,640 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:23:45,427 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.79s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:23:57,423 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:24:06,181 WARN L534 Checker$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 17:24:08,187 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:24:09,219 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:24:18,782 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.50s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:24:20,784 WARN L534 Checker$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 17:24:21,941 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:24:52,572 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:25:13,771 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:25:16,959 WARN L534 Checker$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 17:25:24,190 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:25:31,758 WARN L534 Checker$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 17:25:35,463 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.52s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:25:47,505 WARN L534 Checker$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 17:25:49,511 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:26:03,611 WARN L534 Checker$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 17:26:23,130 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.35s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:26:29,359 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 17:26:33,957 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 17:26:48,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:26:48,812 INFO L93 Difference]: Finished difference Result 30438 states and 31174 transitions. [2021-11-23 17:26:48,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 17:26:48,816 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 133.76470588235293) internal successors, (2274), 17 states have internal predecessors, (2274), 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 2157 [2021-11-23 17:26:48,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:26:48,830 INFO L225 Difference]: With dead ends: 30438 [2021-11-23 17:26:48,830 INFO L226 Difference]: Without dead ends: 18263 [2021-11-23 17:26:48,835 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12991 GetRequests, 12948 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 556 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=483, Invalid=1497, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:26:48,836 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 3741 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 14225 mSolverCounterSat, 584 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 193.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3741 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 14817 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 584 IncrementalHoareTripleChecker+Valid, 14225 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 215.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:26:48,836 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3741 Valid, 213 Invalid, 14817 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [584 Valid, 14225 Invalid, 8 Unknown, 0 Unchecked, 215.2s Time] [2021-11-23 17:26:48,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18263 states. [2021-11-23 17:26:49,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18263 to 14809. [2021-11-23 17:26:49,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14809 states, 14808 states have (on average 1.0245813074014047) internal successors, (15172), 14808 states have internal predecessors, (15172), 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 17:26:49,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14809 states to 14809 states and 15172 transitions. [2021-11-23 17:26:49,153 INFO L78 Accepts]: Start accepts. Automaton has 14809 states and 15172 transitions. Word has length 2157 [2021-11-23 17:26:49,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:26:49,155 INFO L470 AbstractCegarLoop]: Abstraction has 14809 states and 15172 transitions. [2021-11-23 17:26:49,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 133.76470588235293) internal successors, (2274), 17 states have internal predecessors, (2274), 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 17:26:49,157 INFO L276 IsEmpty]: Start isEmpty. Operand 14809 states and 15172 transitions. [2021-11-23 17:26:49,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2201 [2021-11-23 17:26:49,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:26:49,200 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 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, 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, 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] [2021-11-23 17:26:49,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:49,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:49,627 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Ended with exit code 0 [2021-11-23 17:26:49,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:26:49,810 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:26:49,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:26:49,811 INFO L85 PathProgramCache]: Analyzing trace with hash -1073022272, now seen corresponding path program 1 times [2021-11-23 17:26:49,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:26:49,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1277387421] [2021-11-23 17:26:49,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:49,887 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:26:49,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:26:49,888 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:26:49,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_877cda75-e63e-4c08-82f9-394594179e53/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 17:26:50,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:50,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 2347 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:26:50,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:55,941 INFO L134 CoverageAnalysis]: Checked inductivity of 10119 backedges. 5195 proven. 1450 refuted. 0 times theorem prover too weak. 3474 trivial. 0 not checked. [2021-11-23 17:26:55,941 INFO L328 TraceCheckSpWp]: Computing backward predicates...