./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e77c044 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8 --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 92a849e92f30134540f9595cfce3299e46e1c2b1 ..................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8 --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 92a849e92f30134540f9595cfce3299e46e1c2b1 ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 08:11:41,725 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 08:11:41,727 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 08:11:41,777 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 08:11:41,778 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 08:11:41,779 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 08:11:41,781 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 08:11:41,783 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 08:11:41,785 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 08:11:41,787 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 08:11:41,788 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 08:11:41,789 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 08:11:41,790 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 08:11:41,791 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 08:11:41,793 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 08:11:41,795 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 08:11:41,796 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 08:11:41,797 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 08:11:41,799 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 08:11:41,802 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 08:11:41,805 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 08:11:41,806 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 08:11:41,808 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 08:11:41,809 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 08:11:41,813 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 08:11:41,814 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 08:11:41,814 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 08:11:41,815 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 08:11:41,816 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 08:11:41,817 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 08:11:41,818 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 08:11:41,819 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 08:11:41,820 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 08:11:41,821 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 08:11:41,822 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 08:11:41,823 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 08:11:41,824 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 08:11:41,824 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 08:11:41,825 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 08:11:41,826 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 08:11:41,827 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 08:11:41,828 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-13 08:11:41,853 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 08:11:41,854 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 08:11:41,855 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 08:11:41,855 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 08:11:41,855 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 08:11:41,855 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 08:11:41,856 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-13 08:11:41,856 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 08:11:41,856 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 08:11:41,857 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-13 08:11:41,857 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-13 08:11:41,857 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 08:11:41,857 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-13 08:11:41,858 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-13 08:11:41,858 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-13 08:11:41,859 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 08:11:41,859 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 08:11:41,859 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 08:11:41,860 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 08:11:41,860 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 08:11:41,860 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-13 08:11:41,861 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 08:11:41,861 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-13 08:11:41,861 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 08:11:41,861 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 08:11:41,862 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-13 08:11:41,862 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 08:11:41,862 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-13 08:11:41,863 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 08:11:41,863 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 08:11:41,863 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 08:11:41,863 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 08:11:41,864 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 08:11:41,864 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-13 08:11:41,864 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-13 08:11:41,864 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-13 08:11:41,865 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-13 08:11:41,865 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 08:11:41,865 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 08:11:41,866 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_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 92a849e92f30134540f9595cfce3299e46e1c2b1 [2021-10-13 08:11:42,087 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 08:11:42,108 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 08:11:42,110 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 08:11:42,111 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 08:11:42,112 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 08:11:42,113 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c [2021-10-13 08:11:42,186 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/data/a173b943d/499748d528e94c38ad7e5c8eede31238/FLAG11bd6388d [2021-10-13 08:11:42,781 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 08:11:42,782 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c [2021-10-13 08:11:42,793 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/data/a173b943d/499748d528e94c38ad7e5c8eede31238/FLAG11bd6388d [2021-10-13 08:11:43,160 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/data/a173b943d/499748d528e94c38ad7e5c8eede31238 [2021-10-13 08:11:43,163 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 08:11:43,164 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 08:11:43,166 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 08:11:43,166 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 08:11:43,169 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 08:11:43,170 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,171 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@558972ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43, skipping insertion in model container [2021-10-13 08:11:43,172 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,179 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 08:11:43,191 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 08:11:43,417 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c[946,959] [2021-10-13 08:11:43,422 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 08:11:43,435 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 08:11:43,455 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c[946,959] [2021-10-13 08:11:43,456 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 08:11:43,472 INFO L208 MainTranslator]: Completed translation [2021-10-13 08:11:43,473 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43 WrapperNode [2021-10-13 08:11:43,473 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 08:11:43,475 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 08:11:43,475 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 08:11:43,475 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 08:11:43,484 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,491 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,509 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 08:11:43,510 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 08:11:43,511 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 08:11:43,511 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 08:11:43,520 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,521 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,532 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,533 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,541 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,544 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,547 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,549 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 08:11:43,551 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 08:11:43,553 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 08:11:43,553 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 08:11:43,554 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43" (1/1) ... [2021-10-13 08:11:43,561 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 08:11:43,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:11:43,592 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 08:11:43,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 08:11:43,643 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-13 08:11:43,643 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-10-13 08:11:43,644 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-10-13 08:11:43,644 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 08:11:43,644 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-10-13 08:11:43,645 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-10-13 08:11:43,645 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 08:11:43,645 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 08:11:43,933 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 08:11:43,933 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-13 08:11:43,936 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:11:43 BoogieIcfgContainer [2021-10-13 08:11:43,936 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 08:11:43,938 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 08:11:43,938 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 08:11:43,941 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 08:11:43,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 08:11:43" (1/3) ... [2021-10-13 08:11:43,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19e3b702 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:11:43, skipping insertion in model container [2021-10-13 08:11:43,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:43" (2/3) ... [2021-10-13 08:11:43,943 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19e3b702 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:11:43, skipping insertion in model container [2021-10-13 08:11:43,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:11:43" (3/3) ... [2021-10-13 08:11:43,945 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-2.c [2021-10-13 08:11:43,950 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 08:11:43,950 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-13 08:11:43,994 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 08:11:44,001 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, mConcurrency=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 [2021-10-13 08:11:44,001 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-13 08:11:44,017 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 08:11:44,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-13 08:11:44,022 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:11:44,023 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:11:44,024 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:11:44,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:11:44,030 INFO L82 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2021-10-13 08:11:44,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 08:11:44,054 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683516922] [2021-10-13 08:11:44,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:44,056 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 08:11:44,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:44,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:11:44,236 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 08:11:44,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683516922] [2021-10-13 08:11:44,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683516922] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 08:11:44,237 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:11:44,238 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-13 08:11:44,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958034116] [2021-10-13 08:11:44,244 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-13 08:11:44,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 08:11:44,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-13 08:11:44,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 08:11:44,261 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 08:11:44,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:11:44,302 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2021-10-13 08:11:44,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 08:11:44,304 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-10-13 08:11:44,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:11:44,312 INFO L225 Difference]: With dead ends: 36 [2021-10-13 08:11:44,313 INFO L226 Difference]: Without dead ends: 26 [2021-10-13 08:11:44,315 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.4ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 08:11:44,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-10-13 08:11:44,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-10-13 08:11:44,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 08:11:44,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-13 08:11:44,423 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2021-10-13 08:11:44,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:11:44,424 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-13 08:11:44,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 08:11:44,424 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-13 08:11:44,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 08:11:44,426 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:11:44,426 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:11:44,427 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-13 08:11:44,427 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:11:44,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:11:44,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2021-10-13 08:11:44,429 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 08:11:44,429 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1588515577] [2021-10-13 08:11:44,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:44,430 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 08:11:44,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:44,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:11:44,489 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 08:11:44,490 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1588515577] [2021-10-13 08:11:44,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1588515577] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 08:11:44,490 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:11:44,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-13 08:11:44,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737902927] [2021-10-13 08:11:44,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-13 08:11:44,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 08:11:44,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-13 08:11:44,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 08:11:44,495 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 08:11:44,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:11:44,515 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-10-13 08:11:44,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 08:11:44,516 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-10-13 08:11:44,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:11:44,518 INFO L225 Difference]: With dead ends: 32 [2021-10-13 08:11:44,518 INFO L226 Difference]: Without dead ends: 28 [2021-10-13 08:11:44,519 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.8ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-13 08:11:44,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-10-13 08:11:44,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2021-10-13 08:11:44,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 08:11:44,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-10-13 08:11:44,527 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2021-10-13 08:11:44,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:11:44,527 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-10-13 08:11:44,528 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 08:11:44,528 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-10-13 08:11:44,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 08:11:44,529 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:11:44,530 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:11:44,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-13 08:11:44,530 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:11:44,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:11:44,531 INFO L82 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2021-10-13 08:11:44,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 08:11:44,532 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672065244] [2021-10-13 08:11:44,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:44,533 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 08:11:44,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:44,619 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 08:11:44,620 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 08:11:44,620 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672065244] [2021-10-13 08:11:44,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672065244] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 08:11:44,621 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [586465763] [2021-10-13 08:11:44,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:44,621 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:11:44,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:11:44,629 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:11:44,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-13 08:11:44,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:44,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:11:44,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:44,912 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 08:11:44,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:45,137 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 08:11:45,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [586465763] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:11:45,138 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1974802907] [2021-10-13 08:11:45,161 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-10-13 08:11:45,161 INFO L166 IcfgInterpreter]: Building call graph [2021-10-13 08:11:45,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-13 08:11:45,171 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-13 08:11:45,172 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-13 08:11:45,219 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:11:45,238 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 08:11:45,240 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:11:45,242 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-10-13 08:11:45,246 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 08:11:45,250 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:11:45,251 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-10-13 08:11:45,259 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-10-13 08:11:45,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 08:11:45,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 08:11:45,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 08:11:45,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-10-13 08:11:45,319 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:11:45,320 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-13 08:11:45,320 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:11:45,322 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-10-13 08:11:45,323 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-13 08:11:45,325 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-13 08:11:45,368 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:11:45,371 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:11:45,375 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 122 [2021-10-13 08:11:45,375 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-13 08:11:45,376 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:119, output treesize:122 [2021-10-13 08:11:45,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-13 08:11:45,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:11:45,596 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: No corresponding IProgramVar for |v_#valid_10| at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.constructTermVarsProc(BasicPredicateFactory.java:92) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.newPredicate(BasicPredicateFactory.java:81) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.predicate(SymbolicTools.java:174) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:116) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-13 08:11:45,600 INFO L168 Benchmark]: Toolchain (without parser) took 2435.38 ms. Allocated memory was 117.4 MB in the beginning and 159.4 MB in the end (delta: 41.9 MB). Free memory was 86.0 MB in the beginning and 127.5 MB in the end (delta: -41.5 MB). Peak memory consumption was 34.0 MB. Max. memory is 16.1 GB. [2021-10-13 08:11:45,601 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 75.5 MB. Free memory is still 35.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 08:11:45,601 INFO L168 Benchmark]: CACSL2BoogieTranslator took 307.89 ms. Allocated memory is still 117.4 MB. Free memory was 85.7 MB in the beginning and 93.0 MB in the end (delta: -7.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-13 08:11:45,602 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.85 ms. Allocated memory is still 117.4 MB. Free memory was 93.0 MB in the beginning and 91.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 08:11:45,602 INFO L168 Benchmark]: Boogie Preprocessor took 39.60 ms. Allocated memory is still 117.4 MB. Free memory was 91.6 MB in the beginning and 90.4 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 08:11:45,603 INFO L168 Benchmark]: RCFGBuilder took 385.07 ms. Allocated memory is still 117.4 MB. Free memory was 90.4 MB in the beginning and 80.1 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 08:11:45,603 INFO L168 Benchmark]: TraceAbstraction took 1661.59 ms. Allocated memory was 117.4 MB in the beginning and 159.4 MB in the end (delta: 41.9 MB). Free memory was 79.7 MB in the beginning and 127.5 MB in the end (delta: -47.8 MB). Peak memory consumption was 30.5 MB. Max. memory is 16.1 GB. [2021-10-13 08:11:45,606 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 75.5 MB. Free memory is still 35.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 307.89 ms. Allocated memory is still 117.4 MB. Free memory was 85.7 MB in the beginning and 93.0 MB in the end (delta: -7.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 34.85 ms. Allocated memory is still 117.4 MB. Free memory was 93.0 MB in the beginning and 91.6 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 39.60 ms. Allocated memory is still 117.4 MB. Free memory was 91.6 MB in the beginning and 90.4 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 385.07 ms. Allocated memory is still 117.4 MB. Free memory was 90.4 MB in the beginning and 80.1 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1661.59 ms. Allocated memory was 117.4 MB in the beginning and 159.4 MB in the end (delta: 41.9 MB). Free memory was 79.7 MB in the beginning and 127.5 MB in the end (delta: -47.8 MB). Peak memory consumption was 30.5 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: No corresponding IProgramVar for |v_#valid_10| de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No corresponding IProgramVar for |v_#valid_10|: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-10-13 08:11:45,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 08:11:47,959 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 08:11:47,963 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 08:11:48,007 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 08:11:48,007 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 08:11:48,009 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 08:11:48,010 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 08:11:48,013 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 08:11:48,015 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 08:11:48,016 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 08:11:48,017 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 08:11:48,019 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 08:11:48,019 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 08:11:48,021 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 08:11:48,022 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 08:11:48,024 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 08:11:48,025 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 08:11:48,026 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 08:11:48,028 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 08:11:48,030 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 08:11:48,032 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 08:11:48,033 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 08:11:48,034 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 08:11:48,035 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 08:11:48,039 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 08:11:48,039 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 08:11:48,040 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 08:11:48,041 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 08:11:48,042 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 08:11:48,043 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 08:11:48,043 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 08:11:48,044 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 08:11:48,045 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 08:11:48,046 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 08:11:48,047 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 08:11:48,048 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 08:11:48,048 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 08:11:48,049 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 08:11:48,049 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 08:11:48,050 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 08:11:48,051 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 08:11:48,056 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-10-13 08:11:48,083 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 08:11:48,083 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 08:11:48,084 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 08:11:48,084 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 08:11:48,084 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 08:11:48,085 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 08:11:48,085 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 08:11:48,085 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 08:11:48,085 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 08:11:48,086 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 08:11:48,086 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 08:11:48,087 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 08:11:48,087 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 08:11:48,087 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-13 08:11:48,087 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 08:11:48,088 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-13 08:11:48,088 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 08:11:48,088 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-13 08:11:48,088 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-13 08:11:48,089 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 08:11:48,089 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-13 08:11:48,089 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 08:11:48,089 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-13 08:11:48,090 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 08:11:48,090 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 08:11:48,090 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 08:11:48,090 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 08:11:48,091 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 08:11:48,091 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 08:11:48,091 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-13 08:11:48,091 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-10-13 08:11:48,091 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-13 08:11:48,092 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-13 08:11:48,092 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 08:11:48,092 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 08:11:48,092 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_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 92a849e92f30134540f9595cfce3299e46e1c2b1 [2021-10-13 08:11:48,472 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 08:11:48,502 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 08:11:48,505 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 08:11:48,506 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 08:11:48,511 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 08:11:48,512 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c [2021-10-13 08:11:48,585 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/data/7c5190c6c/1c2c663c97424e0b89efc35a18294588/FLAG7e01bc751 [2021-10-13 08:11:49,045 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 08:11:49,047 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c [2021-10-13 08:11:49,054 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/data/7c5190c6c/1c2c663c97424e0b89efc35a18294588/FLAG7e01bc751 [2021-10-13 08:11:49,418 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/data/7c5190c6c/1c2c663c97424e0b89efc35a18294588 [2021-10-13 08:11:49,423 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 08:11:49,427 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 08:11:49,428 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 08:11:49,429 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 08:11:49,432 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 08:11:49,433 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,435 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c98625c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49, skipping insertion in model container [2021-10-13 08:11:49,435 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,443 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 08:11:49,460 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 08:11:49,637 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c[946,959] [2021-10-13 08:11:49,639 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 08:11:49,652 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 08:11:49,677 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/sv-benchmarks/c/recursive-simple/fibo_2calls_6-2.c[946,959] [2021-10-13 08:11:49,678 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 08:11:49,697 INFO L208 MainTranslator]: Completed translation [2021-10-13 08:11:49,698 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49 WrapperNode [2021-10-13 08:11:49,698 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 08:11:49,699 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 08:11:49,699 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 08:11:49,699 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 08:11:49,707 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,716 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,766 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 08:11:49,781 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 08:11:49,781 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 08:11:49,781 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 08:11:49,789 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,797 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,800 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,801 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,806 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,808 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,810 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,812 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 08:11:49,813 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 08:11:49,813 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 08:11:49,813 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 08:11:49,814 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49" (1/1) ... [2021-10-13 08:11:49,821 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 08:11:49,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:11:49,848 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 08:11:49,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 08:11:49,899 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-13 08:11:49,900 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-10-13 08:11:49,903 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-10-13 08:11:49,904 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 08:11:49,904 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-10-13 08:11:49,904 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-10-13 08:11:49,906 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 08:11:49,906 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 08:11:50,201 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 08:11:50,201 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-10-13 08:11:50,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:11:50 BoogieIcfgContainer [2021-10-13 08:11:50,203 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 08:11:50,205 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 08:11:50,205 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 08:11:50,208 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 08:11:50,208 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 08:11:49" (1/3) ... [2021-10-13 08:11:50,209 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52e0ee0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:11:50, skipping insertion in model container [2021-10-13 08:11:50,209 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:11:49" (2/3) ... [2021-10-13 08:11:50,210 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52e0ee0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:11:50, skipping insertion in model container [2021-10-13 08:11:50,210 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:11:50" (3/3) ... [2021-10-13 08:11:50,212 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-2.c [2021-10-13 08:11:50,217 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 08:11:50,218 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-10-13 08:11:50,266 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 08:11:50,272 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, mConcurrency=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 [2021-10-13 08:11:50,272 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-13 08:11:50,288 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 08:11:50,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 08:11:50,293 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:11:50,294 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:11:50,294 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:11:50,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:11:50,304 INFO L82 PathProgramCache]: Analyzing trace with hash 1014607960, now seen corresponding path program 1 times [2021-10-13 08:11:50,315 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:11:50,327 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [324579393] [2021-10-13 08:11:50,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:50,329 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:11:50,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:11:50,351 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:11:50,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-13 08:11:50,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:50,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 08:11:50,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:50,610 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:11:50,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:50,790 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:11:50,791 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:11:50,791 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [324579393] [2021-10-13 08:11:50,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [324579393] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:11:50,792 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:11:50,793 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-10-13 08:11:50,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48612734] [2021-10-13 08:11:50,800 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 08:11:50,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:11:50,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 08:11:50,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-13 08:11:50,842 INFO L87 Difference]: Start difference. First operand has 27 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 08:11:51,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:11:51,021 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2021-10-13 08:11:51,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 08:11:51,024 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 10 [2021-10-13 08:11:51,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:11:51,034 INFO L225 Difference]: With dead ends: 37 [2021-10-13 08:11:51,034 INFO L226 Difference]: Without dead ends: 25 [2021-10-13 08:11:51,037 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 82.8ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-13 08:11:51,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-10-13 08:11:51,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-10-13 08:11:51,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 08:11:51,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2021-10-13 08:11:51,087 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 10 [2021-10-13 08:11:51,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:11:51,088 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2021-10-13 08:11:51,088 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 08:11:51,089 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2021-10-13 08:11:51,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 08:11:51,090 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:11:51,090 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:11:51,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-13 08:11:51,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:11:51,308 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:11:51,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:11:51,309 INFO L82 PathProgramCache]: Analyzing trace with hash 2131805067, now seen corresponding path program 1 times [2021-10-13 08:11:51,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:11:51,310 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1735037947] [2021-10-13 08:11:51,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:51,310 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:11:51,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:11:51,315 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:11:51,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-13 08:11:51,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:51,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 08:11:51,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:51,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:11:51,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:51,588 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:11:51,588 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:11:51,589 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1735037947] [2021-10-13 08:11:51,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1735037947] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:11:51,589 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:11:51,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-10-13 08:11:51,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910867950] [2021-10-13 08:11:51,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 08:11:51,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:11:51,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 08:11:51,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-13 08:11:51,602 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 08:11:51,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:11:51,721 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2021-10-13 08:11:51,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 08:11:51,722 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 11 [2021-10-13 08:11:51,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:11:51,724 INFO L225 Difference]: With dead ends: 31 [2021-10-13 08:11:51,724 INFO L226 Difference]: Without dead ends: 27 [2021-10-13 08:11:51,725 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 44.7ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-13 08:11:51,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-10-13 08:11:51,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2021-10-13 08:11:51,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 08:11:51,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2021-10-13 08:11:51,738 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 11 [2021-10-13 08:11:51,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:11:51,739 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2021-10-13 08:11:51,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 08:11:51,741 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2021-10-13 08:11:51,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 08:11:51,745 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:11:51,750 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:11:51,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-10-13 08:11:51,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:11:51,964 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:11:51,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:11:51,965 INFO L82 PathProgramCache]: Analyzing trace with hash -1494555912, now seen corresponding path program 1 times [2021-10-13 08:11:51,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:11:51,965 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [199514173] [2021-10-13 08:11:51,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:51,966 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:11:51,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:11:51,975 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:11:51,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-13 08:11:52,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:52,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:11:52,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:52,173 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 08:11:52,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:52,525 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 08:11:52,526 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:11:52,526 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [199514173] [2021-10-13 08:11:52,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [199514173] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:11:52,526 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [294455622] [2021-10-13 08:11:52,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:52,527 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:11:52,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:11:52,529 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:11:52,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-10-13 08:11:52,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:52,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 08:11:52,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:52,832 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 08:11:52,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:53,183 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 08:11:53,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [294455622] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:11:53,183 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-10-13 08:11:53,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 9] imperfect sequences [7, 7] total 22 [2021-10-13 08:11:53,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593014926] [2021-10-13 08:11:53,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-13 08:11:53,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:11:53,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-13 08:11:53,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=408, Unknown=0, NotChecked=0, Total=462 [2021-10-13 08:11:53,186 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 08:11:53,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:11:53,329 INFO L93 Difference]: Finished difference Result 48 states and 67 transitions. [2021-10-13 08:11:53,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-10-13 08:11:53,330 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) Word has length 22 [2021-10-13 08:11:53,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:11:53,332 INFO L225 Difference]: With dead ends: 48 [2021-10-13 08:11:53,332 INFO L226 Difference]: Without dead ends: 42 [2021-10-13 08:11:53,332 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 467.3ms TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2021-10-13 08:11:53,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-10-13 08:11:53,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 32. [2021-10-13 08:11:53,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 7 states have call successors, (7), 2 states have call predecessors, (7), 5 states have return successors, (17), 8 states have call predecessors, (17), 7 states have call successors, (17) [2021-10-13 08:11:53,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 47 transitions. [2021-10-13 08:11:53,344 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 47 transitions. Word has length 22 [2021-10-13 08:11:53,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:11:53,345 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 47 transitions. [2021-10-13 08:11:53,345 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 3 states have call successors, (6) [2021-10-13 08:11:53,345 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 47 transitions. [2021-10-13 08:11:53,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-13 08:11:53,347 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:11:53,347 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:11:53,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (5)] Forceful destruction successful, exit code 0 [2021-10-13 08:11:53,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-13 08:11:53,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:11:53,749 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:11:53,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:11:53,750 INFO L82 PathProgramCache]: Analyzing trace with hash -553851548, now seen corresponding path program 1 times [2021-10-13 08:11:53,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:11:53,751 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [868251863] [2021-10-13 08:11:53,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:53,751 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:11:53,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:11:53,753 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:11:53,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-10-13 08:11:53,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:53,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:11:53,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:53,935 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 08:11:53,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:54,163 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 08:11:54,164 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:11:54,164 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [868251863] [2021-10-13 08:11:54,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [868251863] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:11:54,164 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1714341834] [2021-10-13 08:11:54,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:54,165 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:11:54,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:11:54,166 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:11:54,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-10-13 08:11:54,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:54,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:11:54,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:54,392 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 08:11:54,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:54,563 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 08:11:54,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1714341834] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:11:54,564 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162258247] [2021-10-13 08:11:54,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:54,564 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:11:54,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:11:54,566 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:11:54,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-13 08:11:54,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:54,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:11:54,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:54,770 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 08:11:54,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:55,003 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 08:11:55,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162258247] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:11:55,004 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-10-13 08:11:55,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 7] imperfect sequences [7, 7, 7, 7] total 14 [2021-10-13 08:11:55,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63894707] [2021-10-13 08:11:55,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 08:11:55,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:11:55,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 08:11:55,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-10-13 08:11:55,008 INFO L87 Difference]: Start difference. First operand 32 states and 47 transitions. Second operand has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 08:11:55,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:11:55,176 INFO L93 Difference]: Finished difference Result 78 states and 136 transitions. [2021-10-13 08:11:55,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 08:11:55,177 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 24 [2021-10-13 08:11:55,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:11:55,179 INFO L225 Difference]: With dead ends: 78 [2021-10-13 08:11:55,180 INFO L226 Difference]: Without dead ends: 49 [2021-10-13 08:11:55,181 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 129.1ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-10-13 08:11:55,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-10-13 08:11:55,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 40. [2021-10-13 08:11:55,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 24 states have (on average 1.25) internal successors, (30), 26 states have internal predecessors, (30), 9 states have call successors, (9), 3 states have call predecessors, (9), 6 states have return successors, (19), 10 states have call predecessors, (19), 9 states have call successors, (19) [2021-10-13 08:11:55,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 58 transitions. [2021-10-13 08:11:55,198 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 58 transitions. Word has length 24 [2021-10-13 08:11:55,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:11:55,198 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 58 transitions. [2021-10-13 08:11:55,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 08:11:55,199 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 58 transitions. [2021-10-13 08:11:55,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-10-13 08:11:55,203 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:11:55,203 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:11:55,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-10-13 08:11:55,423 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-10-13 08:11:55,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-13 08:11:55,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:11:55,817 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:11:55,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:11:55,818 INFO L82 PathProgramCache]: Analyzing trace with hash -650293480, now seen corresponding path program 1 times [2021-10-13 08:11:55,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:11:55,819 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1467318211] [2021-10-13 08:11:55,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:55,819 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:11:55,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:11:55,820 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:11:55,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-10-13 08:11:55,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:55,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:11:55,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:56,095 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:11:56,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:56,406 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:11:56,407 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:11:56,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1467318211] [2021-10-13 08:11:56,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1467318211] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:11:56,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [530226344] [2021-10-13 08:11:56,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:56,408 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:11:56,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:11:56,409 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:11:56,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-10-13 08:11:56,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:56,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-13 08:11:56,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:56,900 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-10-13 08:11:56,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:57,359 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-10-13 08:11:57,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [530226344] provided 1 perfect and 1 imperfect interpolant sequences [2021-10-13 08:11:57,360 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2021-10-13 08:11:57,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [7, 7, 12] total 25 [2021-10-13 08:11:57,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712943101] [2021-10-13 08:11:57,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 08:11:57,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:11:57,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 08:11:57,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=538, Unknown=0, NotChecked=0, Total=600 [2021-10-13 08:11:57,363 INFO L87 Difference]: Start difference. First operand 40 states and 58 transitions. Second operand has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 08:11:57,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:11:57,426 INFO L93 Difference]: Finished difference Result 62 states and 100 transitions. [2021-10-13 08:11:57,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 08:11:57,427 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 34 [2021-10-13 08:11:57,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:11:57,429 INFO L225 Difference]: With dead ends: 62 [2021-10-13 08:11:57,429 INFO L226 Difference]: Without dead ends: 58 [2021-10-13 08:11:57,430 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 445.3ms TimeCoverageRelationStatistics Valid=62, Invalid=538, Unknown=0, NotChecked=0, Total=600 [2021-10-13 08:11:57,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-10-13 08:11:57,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2021-10-13 08:11:57,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 30 states have internal predecessors, (34), 11 states have call successors, (11), 3 states have call predecessors, (11), 8 states have return successors, (33), 14 states have call predecessors, (33), 11 states have call successors, (33) [2021-10-13 08:11:57,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 78 transitions. [2021-10-13 08:11:57,445 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 78 transitions. Word has length 34 [2021-10-13 08:11:57,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:11:57,445 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 78 transitions. [2021-10-13 08:11:57,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.125) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 08:11:57,446 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 78 transitions. [2021-10-13 08:11:57,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 08:11:57,449 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:11:57,449 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:11:57,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-10-13 08:11:57,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-10-13 08:11:57,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 08:11:57,861 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:11:57,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:11:57,861 INFO L82 PathProgramCache]: Analyzing trace with hash 159296083, now seen corresponding path program 1 times [2021-10-13 08:11:57,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:11:57,861 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2093848167] [2021-10-13 08:11:57,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:57,862 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:11:57,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:11:57,867 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:11:57,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-10-13 08:11:58,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:58,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:11:58,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:58,135 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:11:58,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:58,439 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:11:58,439 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:11:58,439 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2093848167] [2021-10-13 08:11:58,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2093848167] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:11:58,439 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1559814303] [2021-10-13 08:11:58,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:58,440 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:11:58,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:11:58,441 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:11:58,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-10-13 08:11:58,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:58,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 08:11:58,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:58,816 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 08:11:58,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:59,217 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 08:11:59,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1559814303] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:11:59,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315371317] [2021-10-13 08:11:59,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:11:59,218 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:11:59,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:11:59,219 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:11:59,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-13 08:11:59,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:11:59,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 08:11:59,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:11:59,620 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 08:11:59,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:11:59,928 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 08:11:59,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315371317] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:11:59,928 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:11:59,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 8, 9, 8, 9] total 17 [2021-10-13 08:11:59,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743542341] [2021-10-13 08:11:59,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-13 08:11:59,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:11:59,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-13 08:11:59,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-10-13 08:11:59,931 INFO L87 Difference]: Start difference. First operand 48 states and 78 transitions. Second operand has 17 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 17 states have internal predecessors, (48), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2021-10-13 08:12:00,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:12:00,315 INFO L93 Difference]: Finished difference Result 110 states and 201 transitions. [2021-10-13 08:12:00,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 08:12:00,316 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 17 states have internal predecessors, (48), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) Word has length 35 [2021-10-13 08:12:00,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:12:00,318 INFO L225 Difference]: With dead ends: 110 [2021-10-13 08:12:00,318 INFO L226 Difference]: Without dead ends: 65 [2021-10-13 08:12:00,320 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 282.7ms TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-10-13 08:12:00,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-10-13 08:12:00,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 56. [2021-10-13 08:12:00,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 36 states have internal predecessors, (39), 11 states have call successors, (11), 3 states have call predecessors, (11), 11 states have return successors, (42), 16 states have call predecessors, (42), 11 states have call successors, (42) [2021-10-13 08:12:00,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 92 transitions. [2021-10-13 08:12:00,334 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 92 transitions. Word has length 35 [2021-10-13 08:12:00,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:12:00,334 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 92 transitions. [2021-10-13 08:12:00,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 17 states have internal predecessors, (48), 10 states have call successors, (15), 1 states have call predecessors, (15), 6 states have return successors, (17), 9 states have call predecessors, (17), 10 states have call successors, (17) [2021-10-13 08:12:00,335 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 92 transitions. [2021-10-13 08:12:00,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 08:12:00,337 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:12:00,338 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:12:00,376 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:00,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:00,753 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (12)] Ended with exit code 0 [2021-10-13 08:12:00,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:00,952 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:12:00,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:12:00,952 INFO L82 PathProgramCache]: Analyzing trace with hash 186789494, now seen corresponding path program 1 times [2021-10-13 08:12:00,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:12:00,952 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1325889039] [2021-10-13 08:12:00,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:00,953 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:12:00,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:12:00,953 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:12:00,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-10-13 08:12:01,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:01,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:12:01,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:01,239 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:12:01,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:01,452 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:12:01,452 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:12:01,452 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1325889039] [2021-10-13 08:12:01,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1325889039] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:01,452 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [410152959] [2021-10-13 08:12:01,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:01,453 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:01,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:12:01,454 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:12:01,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-10-13 08:12:01,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:01,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:12:01,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:01,886 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:12:01,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:02,079 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:12:02,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [410152959] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:02,080 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284514144] [2021-10-13 08:12:02,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:02,080 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:02,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:12:02,082 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:12:02,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-13 08:12:02,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:02,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:12:02,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:02,492 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:12:02,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:02,678 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:12:02,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284514144] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:02,678 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:12:02,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 10 [2021-10-13 08:12:02,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606790029] [2021-10-13 08:12:02,679 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 08:12:02,679 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:12:02,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 08:12:02,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-10-13 08:12:02,680 INFO L87 Difference]: Start difference. First operand 56 states and 92 transitions. Second operand has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 08:12:02,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:12:02,820 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2021-10-13 08:12:02,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 08:12:02,821 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) Word has length 35 [2021-10-13 08:12:02,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:12:02,823 INFO L225 Difference]: With dead ends: 66 [2021-10-13 08:12:02,823 INFO L226 Difference]: Without dead ends: 62 [2021-10-13 08:12:02,823 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 67.9ms TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-10-13 08:12:02,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-10-13 08:12:02,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 53. [2021-10-13 08:12:02,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 31 states have (on average 1.1935483870967742) internal successors, (37), 34 states have internal predecessors, (37), 11 states have call successors, (11), 3 states have call predecessors, (11), 10 states have return successors, (41), 15 states have call predecessors, (41), 11 states have call successors, (41) [2021-10-13 08:12:02,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 89 transitions. [2021-10-13 08:12:02,836 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 89 transitions. Word has length 35 [2021-10-13 08:12:02,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:12:02,836 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 89 transitions. [2021-10-13 08:12:02,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.625) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (7), 1 states have call predecessors, (7), 3 states have return successors, (7), 3 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 08:12:02,837 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 89 transitions. [2021-10-13 08:12:02,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 08:12:02,839 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:12:02,840 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:12:02,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:03,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:03,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:03,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:12:03,455 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:12:03,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:12:03,455 INFO L82 PathProgramCache]: Analyzing trace with hash 1761102882, now seen corresponding path program 2 times [2021-10-13 08:12:03,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:12:03,455 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2020624888] [2021-10-13 08:12:03,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:03,455 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:12:03,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:12:03,456 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:12:03,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-10-13 08:12:03,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:12:03,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:03,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 08:12:03,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:03,874 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 08:12:03,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:04,351 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 08:12:04,351 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:12:04,351 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2020624888] [2021-10-13 08:12:04,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2020624888] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:04,352 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1541874423] [2021-10-13 08:12:04,352 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:04,352 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:04,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:12:04,366 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:12:04,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-10-13 08:12:04,758 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:12:04,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:04,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:12:04,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:04,882 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:12:04,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:05,131 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:12:05,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1541874423] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:05,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242556727] [2021-10-13 08:12:05,132 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:05,132 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:05,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:12:05,133 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:12:05,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-10-13 08:12:05,467 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:12:05,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:05,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:12:05,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:05,574 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:12:05,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:05,766 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:12:05,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242556727] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:05,766 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:12:05,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 7, 7, 7, 7] total 17 [2021-10-13 08:12:05,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614994214] [2021-10-13 08:12:05,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-13 08:12:05,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:12:05,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-13 08:12:05,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-10-13 08:12:05,769 INFO L87 Difference]: Start difference. First operand 53 states and 89 transitions. Second operand has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) [2021-10-13 08:12:06,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:12:06,166 INFO L93 Difference]: Finished difference Result 133 states and 295 transitions. [2021-10-13 08:12:06,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 08:12:06,166 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) Word has length 35 [2021-10-13 08:12:06,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:12:06,169 INFO L225 Difference]: With dead ends: 133 [2021-10-13 08:12:06,169 INFO L226 Difference]: Without dead ends: 83 [2021-10-13 08:12:06,173 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 330.6ms TimeCoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-10-13 08:12:06,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-13 08:12:06,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 71. [2021-10-13 08:12:06,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 40 states have (on average 1.15) internal successors, (46), 44 states have internal predecessors, (46), 15 states have call successors, (15), 3 states have call predecessors, (15), 15 states have return successors, (86), 23 states have call predecessors, (86), 15 states have call successors, (86) [2021-10-13 08:12:06,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 147 transitions. [2021-10-13 08:12:06,192 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 147 transitions. Word has length 35 [2021-10-13 08:12:06,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:12:06,192 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 147 transitions. [2021-10-13 08:12:06,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 17 states have internal predecessors, (46), 11 states have call successors, (14), 1 states have call predecessors, (14), 6 states have return successors, (16), 7 states have call predecessors, (16), 11 states have call successors, (16) [2021-10-13 08:12:06,193 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 147 transitions. [2021-10-13 08:12:06,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-10-13 08:12:06,196 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:12:06,196 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:12:06,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:06,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:06,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:06,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:06,812 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:12:06,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:12:06,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1656487097, now seen corresponding path program 2 times [2021-10-13 08:12:06,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:12:06,813 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [739850999] [2021-10-13 08:12:06,813 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:06,813 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:12:06,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:12:06,814 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:12:06,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-10-13 08:12:07,118 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:12:07,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:07,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 08:12:07,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:07,234 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 08:12:07,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:07,572 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 08:12:07,572 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:12:07,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [739850999] [2021-10-13 08:12:07,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [739850999] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:07,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1230010124] [2021-10-13 08:12:07,572 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:07,572 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:07,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:12:07,573 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:12:07,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-10-13 08:12:08,007 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:12:08,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:08,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 08:12:08,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:08,128 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 08:12:08,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:08,391 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 08:12:08,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1230010124] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:08,392 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684890066] [2021-10-13 08:12:08,392 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:08,392 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:08,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:12:08,394 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:12:08,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-10-13 08:12:08,806 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:12:08,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:08,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 08:12:08,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:08,908 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-10-13 08:12:08,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:09,173 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-10-13 08:12:09,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684890066] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:09,173 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:12:09,173 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8, 9, 8, 9] total 12 [2021-10-13 08:12:09,174 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126776719] [2021-10-13 08:12:09,174 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-13 08:12:09,174 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:12:09,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-13 08:12:09,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-10-13 08:12:09,175 INFO L87 Difference]: Start difference. First operand 71 states and 147 transitions. Second operand has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) [2021-10-13 08:12:09,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:12:09,341 INFO L93 Difference]: Finished difference Result 157 states and 404 transitions. [2021-10-13 08:12:09,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 08:12:09,342 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) Word has length 35 [2021-10-13 08:12:09,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:12:09,344 INFO L225 Difference]: With dead ends: 157 [2021-10-13 08:12:09,344 INFO L226 Difference]: Without dead ends: 89 [2021-10-13 08:12:09,345 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 104.9ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-10-13 08:12:09,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-10-13 08:12:09,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 83. [2021-10-13 08:12:09,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 50 states have internal predecessors, (52), 18 states have call successors, (18), 3 states have call predecessors, (18), 18 states have return successors, (122), 29 states have call predecessors, (122), 18 states have call successors, (122) [2021-10-13 08:12:09,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 192 transitions. [2021-10-13 08:12:09,364 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 192 transitions. Word has length 35 [2021-10-13 08:12:09,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:12:09,365 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 192 transitions. [2021-10-13 08:12:09,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 3.3) internal successors, (33), 12 states have internal predecessors, (33), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 3 states have call predecessors, (8), 8 states have call successors, (8) [2021-10-13 08:12:09,365 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 192 transitions. [2021-10-13 08:12:09,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-10-13 08:12:09,368 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:12:09,368 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:12:09,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:09,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:09,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:09,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:12:09,972 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:12:09,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:12:09,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1792243333, now seen corresponding path program 1 times [2021-10-13 08:12:09,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:12:09,972 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1295142005] [2021-10-13 08:12:09,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:09,973 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:12:09,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:12:09,974 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:12:09,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-10-13 08:12:10,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:10,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 08:12:10,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:10,521 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-10-13 08:12:10,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:11,207 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 26 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-13 08:12:11,207 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:12:11,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1295142005] [2021-10-13 08:12:11,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1295142005] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:11,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [818262491] [2021-10-13 08:12:11,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:11,207 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:11,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:12:11,208 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:12:11,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-10-13 08:12:11,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:11,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 08:12:11,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:11,898 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-10-13 08:12:11,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:12,320 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-10-13 08:12:12,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [818262491] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:12,321 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526230040] [2021-10-13 08:12:12,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:12,321 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:12,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:12:12,326 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:12:12,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-10-13 08:12:12,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:12,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 08:12:12,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:12,942 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-10-13 08:12:12,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:13,225 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-10-13 08:12:13,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526230040] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:13,226 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:12:13,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 8, 9, 8, 9] total 21 [2021-10-13 08:12:13,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398281663] [2021-10-13 08:12:13,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-10-13 08:12:13,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:12:13,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-10-13 08:12:13,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-10-13 08:12:13,230 INFO L87 Difference]: Start difference. First operand 83 states and 192 transitions. Second operand has 21 states, 18 states have (on average 3.111111111111111) internal successors, (56), 21 states have internal predecessors, (56), 15 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 15 states have call successors, (22) [2021-10-13 08:12:14,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:12:14,087 INFO L93 Difference]: Finished difference Result 233 states and 762 transitions. [2021-10-13 08:12:14,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-13 08:12:14,088 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 3.111111111111111) internal successors, (56), 21 states have internal predecessors, (56), 15 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 15 states have call successors, (22) Word has length 47 [2021-10-13 08:12:14,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:12:14,094 INFO L225 Difference]: With dead ends: 233 [2021-10-13 08:12:14,095 INFO L226 Difference]: Without dead ends: 148 [2021-10-13 08:12:14,097 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 544.6ms TimeCoverageRelationStatistics Valid=138, Invalid=732, Unknown=0, NotChecked=0, Total=870 [2021-10-13 08:12:14,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-10-13 08:12:14,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 121. [2021-10-13 08:12:14,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 67 states have (on average 1.1194029850746268) internal successors, (75), 71 states have internal predecessors, (75), 27 states have call successors, (27), 5 states have call predecessors, (27), 26 states have return successors, (221), 44 states have call predecessors, (221), 27 states have call successors, (221) [2021-10-13 08:12:14,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 323 transitions. [2021-10-13 08:12:14,160 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 323 transitions. Word has length 47 [2021-10-13 08:12:14,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:12:14,161 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 323 transitions. [2021-10-13 08:12:14,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 3.111111111111111) internal successors, (56), 21 states have internal predecessors, (56), 15 states have call successors, (18), 1 states have call predecessors, (18), 8 states have return successors, (22), 9 states have call predecessors, (22), 15 states have call successors, (22) [2021-10-13 08:12:14,161 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 323 transitions. [2021-10-13 08:12:14,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-10-13 08:12:14,168 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:12:14,168 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:12:14,176 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:14,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:14,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:14,771 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:12:14,772 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:12:14,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:12:14,772 INFO L82 PathProgramCache]: Analyzing trace with hash 1482129412, now seen corresponding path program 1 times [2021-10-13 08:12:14,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:12:14,773 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [578131218] [2021-10-13 08:12:14,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:14,773 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:12:14,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:12:14,773 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:12:14,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-10-13 08:12:15,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:15,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 08:12:15,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:15,312 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-13 08:12:15,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:15,732 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-13 08:12:15,732 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:12:15,732 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [578131218] [2021-10-13 08:12:15,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [578131218] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:15,732 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [40178589] [2021-10-13 08:12:15,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:15,733 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:15,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:12:15,743 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:12:15,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-10-13 08:12:16,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:16,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 08:12:16,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:16,451 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-13 08:12:16,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:16,854 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-13 08:12:16,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [40178589] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:16,854 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277212729] [2021-10-13 08:12:16,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:16,854 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:16,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:12:16,859 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:12:16,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-10-13 08:12:17,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:17,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 08:12:17,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:17,531 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-13 08:12:17,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:17,927 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-10-13 08:12:17,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277212729] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:17,928 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:12:17,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 9, 11, 9, 11] total 14 [2021-10-13 08:12:17,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629466818] [2021-10-13 08:12:17,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-13 08:12:17,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:12:17,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-13 08:12:17,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-10-13 08:12:17,929 INFO L87 Difference]: Start difference. First operand 121 states and 323 transitions. Second operand has 14 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 14 states have internal predecessors, (38), 10 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (11), 4 states have call predecessors, (11), 10 states have call successors, (11) [2021-10-13 08:12:18,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:12:18,203 INFO L93 Difference]: Finished difference Result 264 states and 918 transitions. [2021-10-13 08:12:18,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 08:12:18,204 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 14 states have internal predecessors, (38), 10 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (11), 4 states have call predecessors, (11), 10 states have call successors, (11) Word has length 47 [2021-10-13 08:12:18,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:12:18,226 INFO L225 Difference]: With dead ends: 264 [2021-10-13 08:12:18,227 INFO L226 Difference]: Without dead ends: 142 [2021-10-13 08:12:18,230 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 268 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 140.3ms TimeCoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-10-13 08:12:18,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-10-13 08:12:18,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 139. [2021-10-13 08:12:18,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 77 states have (on average 1.103896103896104) internal successors, (85), 81 states have internal predecessors, (85), 30 states have call successors, (30), 5 states have call predecessors, (30), 31 states have return successors, (291), 52 states have call predecessors, (291), 30 states have call successors, (291) [2021-10-13 08:12:18,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 406 transitions. [2021-10-13 08:12:18,257 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 406 transitions. Word has length 47 [2021-10-13 08:12:18,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:12:18,258 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 406 transitions. [2021-10-13 08:12:18,258 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 14 states have internal predecessors, (38), 10 states have call successors, (10), 1 states have call predecessors, (10), 5 states have return successors, (11), 4 states have call predecessors, (11), 10 states have call successors, (11) [2021-10-13 08:12:18,258 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 406 transitions. [2021-10-13 08:12:18,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-10-13 08:12:18,264 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:12:18,264 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:12:18,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:18,498 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2021-10-13 08:12:18,679 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (27)] Ended with exit code 0 [2021-10-13 08:12:18,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:18,878 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:12:18,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:12:18,878 INFO L82 PathProgramCache]: Analyzing trace with hash 503223527, now seen corresponding path program 3 times [2021-10-13 08:12:18,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:12:18,878 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [796971032] [2021-10-13 08:12:18,879 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 08:12:18,879 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:12:18,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:12:18,880 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:12:18,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-10-13 08:12:19,358 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-13 08:12:19,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:19,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:12:19,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:19,496 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 08:12:19,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:19,857 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 08:12:19,857 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:12:19,857 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [796971032] [2021-10-13 08:12:19,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [796971032] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:19,858 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1288128737] [2021-10-13 08:12:19,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 08:12:19,858 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:19,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:12:19,862 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:12:19,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-10-13 08:12:20,617 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-13 08:12:20,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:20,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:12:20,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:20,730 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 08:12:20,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:21,085 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 08:12:21,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1288128737] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:21,085 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559307860] [2021-10-13 08:12:21,086 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 08:12:21,086 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:21,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:12:21,087 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:12:21,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-10-13 08:12:21,734 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-13 08:12:21,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:21,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-13 08:12:21,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:21,911 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 08:12:21,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:22,373 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-10-13 08:12:22,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559307860] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:22,373 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:12:22,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 8, 8] total 15 [2021-10-13 08:12:22,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177104635] [2021-10-13 08:12:22,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 08:12:22,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:12:22,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 08:12:22,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-10-13 08:12:22,375 INFO L87 Difference]: Start difference. First operand 139 states and 406 transitions. Second operand has 15 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 15 states have internal predecessors, (40), 8 states have call successors, (15), 1 states have call predecessors, (15), 4 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) [2021-10-13 08:12:22,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:12:22,579 INFO L93 Difference]: Finished difference Result 291 states and 1097 transitions. [2021-10-13 08:12:22,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 08:12:22,580 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 15 states have internal predecessors, (40), 8 states have call successors, (15), 1 states have call predecessors, (15), 4 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) Word has length 59 [2021-10-13 08:12:22,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:12:22,585 INFO L225 Difference]: With dead ends: 291 [2021-10-13 08:12:22,585 INFO L226 Difference]: Without dead ends: 155 [2021-10-13 08:12:22,589 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 222.8ms TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2021-10-13 08:12:22,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-10-13 08:12:22,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 137. [2021-10-13 08:12:22,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 77 states have (on average 1.103896103896104) internal successors, (85), 80 states have internal predecessors, (85), 29 states have call successors, (29), 6 states have call predecessors, (29), 30 states have return successors, (259), 50 states have call predecessors, (259), 29 states have call successors, (259) [2021-10-13 08:12:22,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 373 transitions. [2021-10-13 08:12:22,622 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 373 transitions. Word has length 59 [2021-10-13 08:12:22,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:12:22,623 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 373 transitions. [2021-10-13 08:12:22,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 15 states have internal predecessors, (40), 8 states have call successors, (15), 1 states have call predecessors, (15), 4 states have return successors, (16), 8 states have call predecessors, (16), 8 states have call successors, (16) [2021-10-13 08:12:22,623 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 373 transitions. [2021-10-13 08:12:22,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-10-13 08:12:22,628 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:12:22,628 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:12:22,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:22,864 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-10-13 08:12:23,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:23,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:23,241 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:12:23,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:12:23,241 INFO L82 PathProgramCache]: Analyzing trace with hash -866325196, now seen corresponding path program 2 times [2021-10-13 08:12:23,241 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:12:23,242 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [13955228] [2021-10-13 08:12:23,242 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:23,242 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:12:23,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:12:23,243 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:12:23,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-10-13 08:12:23,939 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:12:23,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:23,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 08:12:23,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:24,251 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 13 proven. 77 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-10-13 08:12:24,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:25,282 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 13 proven. 85 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-10-13 08:12:25,282 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:12:25,283 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [13955228] [2021-10-13 08:12:25,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [13955228] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:25,283 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1150954837] [2021-10-13 08:12:25,283 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:25,283 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:25,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:12:25,284 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:12:25,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-10-13 08:12:26,165 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:12:26,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:26,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-13 08:12:26,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:26,448 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 50 proven. 26 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-10-13 08:12:26,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:27,173 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 58 proven. 25 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-10-13 08:12:27,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1150954837] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:27,174 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1007265677] [2021-10-13 08:12:27,174 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:27,174 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:27,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:12:27,175 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:12:27,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-10-13 08:12:27,960 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:12:27,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:27,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 08:12:27,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:28,134 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 58 proven. 20 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2021-10-13 08:12:28,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:28,605 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 58 proven. 25 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-10-13 08:12:28,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1007265677] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:28,605 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:12:28,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 9, 11, 9, 11] total 25 [2021-10-13 08:12:28,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801974817] [2021-10-13 08:12:28,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-10-13 08:12:28,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:12:28,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-10-13 08:12:28,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2021-10-13 08:12:28,608 INFO L87 Difference]: Start difference. First operand 137 states and 373 transitions. Second operand has 25 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 25 states have internal predecessors, (70), 19 states have call successors, (24), 1 states have call predecessors, (24), 10 states have return successors, (32), 11 states have call predecessors, (32), 19 states have call successors, (32) [2021-10-13 08:12:29,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:12:29,789 INFO L93 Difference]: Finished difference Result 342 states and 1176 transitions. [2021-10-13 08:12:29,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-13 08:12:29,790 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 25 states have internal predecessors, (70), 19 states have call successors, (24), 1 states have call predecessors, (24), 10 states have return successors, (32), 11 states have call predecessors, (32), 19 states have call successors, (32) Word has length 83 [2021-10-13 08:12:29,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:12:29,798 INFO L225 Difference]: With dead ends: 342 [2021-10-13 08:12:29,798 INFO L226 Difference]: Without dead ends: 200 [2021-10-13 08:12:29,804 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 470 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 823.6ms TimeCoverageRelationStatistics Valid=223, Invalid=1259, Unknown=0, NotChecked=0, Total=1482 [2021-10-13 08:12:29,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-10-13 08:12:29,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 178. [2021-10-13 08:12:29,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 103 states have (on average 1.0679611650485437) internal successors, (110), 106 states have internal predecessors, (110), 32 states have call successors, (32), 8 states have call predecessors, (32), 42 states have return successors, (325), 63 states have call predecessors, (325), 32 states have call successors, (325) [2021-10-13 08:12:29,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 467 transitions. [2021-10-13 08:12:29,846 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 467 transitions. Word has length 83 [2021-10-13 08:12:29,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:12:29,849 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 467 transitions. [2021-10-13 08:12:29,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 3.1818181818181817) internal successors, (70), 25 states have internal predecessors, (70), 19 states have call successors, (24), 1 states have call predecessors, (24), 10 states have return successors, (32), 11 states have call predecessors, (32), 19 states have call successors, (32) [2021-10-13 08:12:29,850 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 467 transitions. [2021-10-13 08:12:29,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-10-13 08:12:29,859 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:12:29,859 INFO L512 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 14, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:12:29,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:30,083 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:30,300 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-10-13 08:12:30,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:30,476 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:12:30,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:12:30,476 INFO L82 PathProgramCache]: Analyzing trace with hash -746140366, now seen corresponding path program 1 times [2021-10-13 08:12:30,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:12:30,477 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [22310224] [2021-10-13 08:12:30,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:30,477 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:12:30,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:12:30,478 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:12:30,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-10-13 08:12:31,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:31,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 08:12:31,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:31,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1823 backedges. 44 proven. 359 refuted. 0 times theorem prover too weak. 1420 trivial. 0 not checked. [2021-10-13 08:12:31,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:33,019 INFO L134 CoverageAnalysis]: Checked inductivity of 1823 backedges. 44 proven. 369 refuted. 0 times theorem prover too weak. 1410 trivial. 0 not checked. [2021-10-13 08:12:33,019 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:12:33,019 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [22310224] [2021-10-13 08:12:33,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [22310224] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:33,019 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1530987275] [2021-10-13 08:12:33,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:33,020 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:33,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:12:33,022 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:12:33,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-10-13 08:12:34,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:34,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 08:12:34,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:34,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1823 backedges. 44 proven. 359 refuted. 0 times theorem prover too weak. 1420 trivial. 0 not checked. [2021-10-13 08:12:34,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:35,829 INFO L134 CoverageAnalysis]: Checked inductivity of 1823 backedges. 44 proven. 369 refuted. 0 times theorem prover too weak. 1410 trivial. 0 not checked. [2021-10-13 08:12:35,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1530987275] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:35,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958691966] [2021-10-13 08:12:35,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:12:35,829 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:35,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:12:35,830 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:12:35,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-10-13 08:12:36,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:12:36,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 08:12:36,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:37,468 INFO L134 CoverageAnalysis]: Checked inductivity of 1823 backedges. 44 proven. 359 refuted. 0 times theorem prover too weak. 1420 trivial. 0 not checked. [2021-10-13 08:12:37,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:38,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1823 backedges. 44 proven. 369 refuted. 0 times theorem prover too weak. 1410 trivial. 0 not checked. [2021-10-13 08:12:38,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1958691966] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:38,743 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:12:38,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 10, 13, 10, 13] total 16 [2021-10-13 08:12:38,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168001282] [2021-10-13 08:12:38,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-10-13 08:12:38,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:12:38,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-10-13 08:12:38,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-10-13 08:12:38,746 INFO L87 Difference]: Start difference. First operand 178 states and 467 transitions. Second operand has 16 states, 14 states have (on average 3.642857142857143) internal successors, (51), 16 states have internal predecessors, (51), 13 states have call successors, (16), 1 states have call predecessors, (16), 6 states have return successors, (18), 6 states have call predecessors, (18), 13 states have call successors, (18) [2021-10-13 08:12:39,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:12:39,001 INFO L93 Difference]: Finished difference Result 373 states and 1224 transitions. [2021-10-13 08:12:39,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 08:12:39,002 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 3.642857142857143) internal successors, (51), 16 states have internal predecessors, (51), 13 states have call successors, (16), 1 states have call predecessors, (16), 6 states have return successors, (18), 6 states have call predecessors, (18), 13 states have call successors, (18) Word has length 243 [2021-10-13 08:12:39,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:12:39,008 INFO L225 Difference]: With dead ends: 373 [2021-10-13 08:12:39,008 INFO L226 Difference]: Without dead ends: 198 [2021-10-13 08:12:39,012 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 1457 GetRequests, 1438 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 171.9ms TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2021-10-13 08:12:39,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-10-13 08:12:39,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 195. [2021-10-13 08:12:39,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 113 states have (on average 1.0619469026548674) internal successors, (120), 116 states have internal predecessors, (120), 34 states have call successors, (34), 8 states have call predecessors, (34), 47 states have return successors, (393), 70 states have call predecessors, (393), 34 states have call successors, (393) [2021-10-13 08:12:39,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 547 transitions. [2021-10-13 08:12:39,045 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 547 transitions. Word has length 243 [2021-10-13 08:12:39,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:12:39,046 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 547 transitions. [2021-10-13 08:12:39,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 3.642857142857143) internal successors, (51), 16 states have internal predecessors, (51), 13 states have call successors, (16), 1 states have call predecessors, (16), 6 states have return successors, (18), 6 states have call predecessors, (18), 13 states have call successors, (18) [2021-10-13 08:12:39,047 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 547 transitions. [2021-10-13 08:12:39,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-10-13 08:12:39,053 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:12:39,054 INFO L512 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 8, 8, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:12:39,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:39,272 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (36)] Ended with exit code 0 [2021-10-13 08:12:39,493 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:39,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:39,669 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:12:39,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:12:39,670 INFO L82 PathProgramCache]: Analyzing trace with hash -733823281, now seen corresponding path program 4 times [2021-10-13 08:12:39,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:12:39,670 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [767095130] [2021-10-13 08:12:39,670 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-13 08:12:39,670 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:12:39,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:12:39,671 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:12:39,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-10-13 08:12:40,685 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-13 08:12:40,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:40,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-13 08:12:40,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:41,143 INFO L134 CoverageAnalysis]: Checked inductivity of 827 backedges. 32 proven. 260 refuted. 0 times theorem prover too weak. 535 trivial. 0 not checked. [2021-10-13 08:12:41,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:42,821 INFO L134 CoverageAnalysis]: Checked inductivity of 827 backedges. 32 proven. 274 refuted. 0 times theorem prover too weak. 521 trivial. 0 not checked. [2021-10-13 08:12:42,821 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:12:42,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [767095130] [2021-10-13 08:12:42,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [767095130] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:42,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [182650151] [2021-10-13 08:12:42,822 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-13 08:12:42,822 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:42,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:12:42,826 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:12:42,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-10-13 08:12:44,378 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-13 08:12:44,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:44,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 21 conjunts are in the unsatisfiable core [2021-10-13 08:12:44,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:44,855 INFO L134 CoverageAnalysis]: Checked inductivity of 827 backedges. 110 proven. 179 refuted. 0 times theorem prover too weak. 538 trivial. 0 not checked. [2021-10-13 08:12:44,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:46,133 INFO L134 CoverageAnalysis]: Checked inductivity of 827 backedges. 134 proven. 139 refuted. 0 times theorem prover too weak. 554 trivial. 0 not checked. [2021-10-13 08:12:46,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [182650151] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:46,133 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1816980947] [2021-10-13 08:12:46,133 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-13 08:12:46,134 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:46,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:12:46,144 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:12:46,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-10-13 08:12:47,598 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-13 08:12:47,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:47,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 16 conjunts are in the unsatisfiable core [2021-10-13 08:12:47,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:48,101 INFO L134 CoverageAnalysis]: Checked inductivity of 827 backedges. 246 proven. 79 refuted. 0 times theorem prover too weak. 502 trivial. 0 not checked. [2021-10-13 08:12:48,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:49,475 INFO L134 CoverageAnalysis]: Checked inductivity of 827 backedges. 246 proven. 103 refuted. 0 times theorem prover too weak. 478 trivial. 0 not checked. [2021-10-13 08:12:49,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1816980947] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:49,475 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:12:49,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 10, 13, 12, 17] total 43 [2021-10-13 08:12:49,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028599992] [2021-10-13 08:12:49,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-10-13 08:12:49,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:12:49,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-10-13 08:12:49,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1625, Unknown=0, NotChecked=0, Total=1806 [2021-10-13 08:12:49,478 INFO L87 Difference]: Start difference. First operand 195 states and 547 transitions. Second operand has 43 states, 40 states have (on average 2.9) internal successors, (116), 43 states have internal predecessors, (116), 34 states have call successors, (43), 1 states have call predecessors, (43), 19 states have return successors, (60), 23 states have call predecessors, (60), 34 states have call successors, (60) [2021-10-13 08:12:53,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:12:53,578 INFO L93 Difference]: Finished difference Result 610 states and 2756 transitions. [2021-10-13 08:12:53,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-10-13 08:12:53,580 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 40 states have (on average 2.9) internal successors, (116), 43 states have internal predecessors, (116), 34 states have call successors, (43), 1 states have call predecessors, (43), 19 states have return successors, (60), 23 states have call predecessors, (60), 34 states have call successors, (60) Word has length 167 [2021-10-13 08:12:53,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:12:53,594 INFO L225 Difference]: With dead ends: 610 [2021-10-13 08:12:53,594 INFO L226 Difference]: Without dead ends: 392 [2021-10-13 08:12:53,607 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 1035 GetRequests, 956 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1363 ImplicationChecksByTransitivity, 2501.4ms TimeCoverageRelationStatistics Valid=870, Invalid=5610, Unknown=0, NotChecked=0, Total=6480 [2021-10-13 08:12:53,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-10-13 08:12:53,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 294. [2021-10-13 08:12:53,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 294 states, 179 states have (on average 1.100558659217877) internal successors, (197), 177 states have internal predecessors, (197), 50 states have call successors, (50), 22 states have call predecessors, (50), 64 states have return successors, (623), 94 states have call predecessors, (623), 50 states have call successors, (623) [2021-10-13 08:12:53,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 870 transitions. [2021-10-13 08:12:53,694 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 870 transitions. Word has length 167 [2021-10-13 08:12:53,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:12:53,695 INFO L470 AbstractCegarLoop]: Abstraction has 294 states and 870 transitions. [2021-10-13 08:12:53,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 40 states have (on average 2.9) internal successors, (116), 43 states have internal predecessors, (116), 34 states have call successors, (43), 1 states have call predecessors, (43), 19 states have return successors, (60), 23 states have call predecessors, (60), 34 states have call successors, (60) [2021-10-13 08:12:53,695 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 870 transitions. [2021-10-13 08:12:53,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-10-13 08:12:53,704 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:12:53,705 INFO L512 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:12:53,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:53,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-10-13 08:12:54,120 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (38)] Ended with exit code 0 [2021-10-13 08:12:54,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:12:54,311 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:12:54,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:12:54,312 INFO L82 PathProgramCache]: Analyzing trace with hash -49206073, now seen corresponding path program 2 times [2021-10-13 08:12:54,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:12:54,312 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1339314158] [2021-10-13 08:12:54,312 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:54,312 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:12:54,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:12:54,313 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:12:54,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-10-13 08:12:55,555 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:12:55,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:55,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-13 08:12:55,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:55,921 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 34 proven. 184 refuted. 0 times theorem prover too weak. 278 trivial. 0 not checked. [2021-10-13 08:12:55,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:56,920 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 34 proven. 200 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-10-13 08:12:56,920 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:12:56,920 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1339314158] [2021-10-13 08:12:56,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1339314158] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:56,921 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [760263433] [2021-10-13 08:12:56,921 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:56,921 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:12:56,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:12:56,923 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:12:56,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-10-13 08:12:58,747 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:12:58,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:12:58,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-13 08:12:58,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:12:59,024 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 34 proven. 184 refuted. 0 times theorem prover too weak. 278 trivial. 0 not checked. [2021-10-13 08:12:59,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:12:59,962 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 34 proven. 200 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-10-13 08:12:59,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [760263433] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:12:59,962 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308630905] [2021-10-13 08:12:59,962 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:12:59,962 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:12:59,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:12:59,963 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:12:59,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-10-13 08:13:01,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:13:01,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:13:01,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 08:13:01,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:13:02,148 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 51 proven. 67 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-10-13 08:13:02,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:13:03,082 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 51 proven. 68 refuted. 0 times theorem prover too weak. 377 trivial. 0 not checked. [2021-10-13 08:13:03,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308630905] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:13:03,082 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:13:03,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 11, 15, 9, 10] total 26 [2021-10-13 08:13:03,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961111156] [2021-10-13 08:13:03,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-10-13 08:13:03,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:13:03,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-10-13 08:13:03,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=560, Unknown=0, NotChecked=0, Total=650 [2021-10-13 08:13:03,085 INFO L87 Difference]: Start difference. First operand 294 states and 870 transitions. Second operand has 26 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 26 states have internal predecessors, (73), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (31), 12 states have call predecessors, (31), 20 states have call successors, (31) [2021-10-13 08:13:04,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:13:04,705 INFO L93 Difference]: Finished difference Result 575 states and 2193 transitions. [2021-10-13 08:13:04,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-10-13 08:13:04,706 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 26 states have internal predecessors, (73), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (31), 12 states have call predecessors, (31), 20 states have call successors, (31) Word has length 133 [2021-10-13 08:13:04,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:13:04,711 INFO L225 Difference]: With dead ends: 575 [2021-10-13 08:13:04,711 INFO L226 Difference]: Without dead ends: 223 [2021-10-13 08:13:04,718 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 814 GetRequests, 768 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 1034.3ms TimeCoverageRelationStatistics Valid=371, Invalid=1885, Unknown=0, NotChecked=0, Total=2256 [2021-10-13 08:13:04,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-10-13 08:13:04,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 173. [2021-10-13 08:13:04,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 112 states have (on average 1.1696428571428572) internal successors, (131), 110 states have internal predecessors, (131), 32 states have call successors, (32), 21 states have call predecessors, (32), 28 states have return successors, (141), 41 states have call predecessors, (141), 32 states have call successors, (141) [2021-10-13 08:13:04,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 304 transitions. [2021-10-13 08:13:04,738 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 304 transitions. Word has length 133 [2021-10-13 08:13:04,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:13:04,739 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 304 transitions. [2021-10-13 08:13:04,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 26 states have internal predecessors, (73), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (31), 12 states have call predecessors, (31), 20 states have call successors, (31) [2021-10-13 08:13:04,739 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 304 transitions. [2021-10-13 08:13:04,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-10-13 08:13:04,743 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:13:04,743 INFO L512 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:13:04,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-10-13 08:13:04,984 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-10-13 08:13:05,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-10-13 08:13:05,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 08:13:05,359 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-10-13 08:13:05,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:13:05,360 INFO L82 PathProgramCache]: Analyzing trace with hash -1315412580, now seen corresponding path program 3 times [2021-10-13 08:13:05,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:13:05,360 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1704510388] [2021-10-13 08:13:05,360 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 08:13:05,361 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:13:05,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:13:05,362 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:13:05,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-10-13 08:13:06,918 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-10-13 08:13:06,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-10-13 08:13:06,919 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-13 08:13:07,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-13 08:13:07,210 INFO L133 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2021-10-13 08:13:07,210 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-10-13 08:13:07,211 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-13 08:13:07,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-10-13 08:13:07,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:13:07,435 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-13 08:13:07,556 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 08:13:07 BoogieIcfgContainer [2021-10-13 08:13:07,556 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-13 08:13:07,556 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-13 08:13:07,556 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-13 08:13:07,557 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-13 08:13:07,557 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:11:50" (3/4) ... [2021-10-13 08:13:07,559 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-13 08:13:07,652 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/witness.graphml [2021-10-13 08:13:07,652 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-13 08:13:07,654 INFO L168 Benchmark]: Toolchain (without parser) took 78226.01 ms. Allocated memory was 73.4 MB in the beginning and 176.2 MB in the end (delta: 102.8 MB). Free memory was 54.6 MB in the beginning and 91.4 MB in the end (delta: -36.8 MB). Peak memory consumption was 127.1 MB. Max. memory is 16.1 GB. [2021-10-13 08:13:07,654 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 73.4 MB. Free memory is still 53.7 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 08:13:07,655 INFO L168 Benchmark]: CACSL2BoogieTranslator took 270.00 ms. Allocated memory is still 73.4 MB. Free memory was 54.3 MB in the beginning and 44.5 MB in the end (delta: 9.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 08:13:07,655 INFO L168 Benchmark]: Boogie Procedure Inliner took 80.86 ms. Allocated memory is still 73.4 MB. Free memory was 44.5 MB in the beginning and 56.2 MB in the end (delta: -11.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-13 08:13:07,655 INFO L168 Benchmark]: Boogie Preprocessor took 31.16 ms. Allocated memory is still 73.4 MB. Free memory was 56.2 MB in the beginning and 55.2 MB in the end (delta: 986.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 08:13:07,656 INFO L168 Benchmark]: RCFGBuilder took 390.61 ms. Allocated memory is still 73.4 MB. Free memory was 55.2 MB in the beginning and 45.4 MB in the end (delta: 9.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-13 08:13:07,656 INFO L168 Benchmark]: TraceAbstraction took 77350.97 ms. Allocated memory was 73.4 MB in the beginning and 176.2 MB in the end (delta: 102.8 MB). Free memory was 44.9 MB in the beginning and 45.4 MB in the end (delta: -544.5 kB). Peak memory consumption was 105.0 MB. Max. memory is 16.1 GB. [2021-10-13 08:13:07,657 INFO L168 Benchmark]: Witness Printer took 96.08 ms. Allocated memory is still 176.2 MB. Free memory was 44.4 MB in the beginning and 91.4 MB in the end (delta: -47.0 MB). Peak memory consumption was 14.9 MB. Max. memory is 16.1 GB. [2021-10-13 08:13:07,659 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 73.4 MB. Free memory is still 53.7 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 270.00 ms. Allocated memory is still 73.4 MB. Free memory was 54.3 MB in the beginning and 44.5 MB in the end (delta: 9.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 80.86 ms. Allocated memory is still 73.4 MB. Free memory was 44.5 MB in the beginning and 56.2 MB in the end (delta: -11.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 31.16 ms. Allocated memory is still 73.4 MB. Free memory was 56.2 MB in the beginning and 55.2 MB in the end (delta: 986.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 390.61 ms. Allocated memory is still 73.4 MB. Free memory was 55.2 MB in the beginning and 45.4 MB in the end (delta: 9.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 77350.97 ms. Allocated memory was 73.4 MB in the beginning and 176.2 MB in the end (delta: 102.8 MB). Free memory was 44.9 MB in the beginning and 45.4 MB in the end (delta: -544.5 kB). Peak memory consumption was 105.0 MB. Max. memory is 16.1 GB. * Witness Printer took 96.08 ms. Allocated memory is still 176.2 MB. Free memory was 44.4 MB in the beginning and 91.4 MB in the end (delta: -47.0 MB). Peak memory consumption was 14.9 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int x = 6; [L39] CALL, EXPR fibo1(x) VAL [\old(n)=6] [L10] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L12] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=5] [L20] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L22] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=4] [L10] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L12] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L20] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L22] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=5, fibo1(n-1)=3, n=5] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=3] [L10] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L12] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=5, fibo1(n-1)=3, fibo1(n-2)=2, n=5] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=6, fibo2(n-1)=5, n=6] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=4] [L20] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L22] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L10] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L12] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=6, fibo2(n-1)=5, fibo2(n-2)=3, n=6] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) [L39] int result = fibo1(x); [L40] COND TRUE result == 8 [L41] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 77169.6ms, OverallIterations: 17, TraceHistogramMax: 20, EmptinessCheckTime: 78.5ms, AutomataDifference: 10469.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 11.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 426 SDtfs, 664 SDslu, 3192 SDs, 0 SdLazy, 5711 SolverSat, 914 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5546.4ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5973 GetRequests, 5599 SyntacticMatches, 0 SemanticMatches, 374 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2429 ImplicationChecksByTransitivity, 7394.9ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=294occurred in iteration=15, InterpolantAutomatonStates: 223, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 455.7ms AutomataMinimizationTime, 16 MinimizatonAttempts, 288 StatesRemovedByMinimization, 15 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 331.9ms SsaConstructionTime, 1505.9ms SatisfiabilityAnalysisTime, 31623.5ms InterpolantComputationTime, 3124 NumberOfCodeBlocks, 3061 NumberOfCodeBlocksAsserted, 71 NumberOfCheckSat, 5840 ConstructedInterpolants, 0 QuantifiedInterpolants, 12180 SizeOfPredicates, 151 NumberOfNonLiveVariables, 4867 ConjunctsInSsa, 380 ConjunctsInUnsatCore, 84 InterpolantComputations, 9 PerfectInterpolantSequences, 16525/21362 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-10-13 08:13:07,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b08992c-c091-4213-87e1-3cb8ee793233/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...