./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1d5f7b2f1816dd8d73aabb707e1456dfc72cb3843c81f782dda241fa9bcec7fd --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:46:07,708 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:46:07,711 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:46:07,765 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:46:07,765 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:46:07,770 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:46:07,772 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:46:07,776 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:46:07,780 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:46:07,788 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:46:07,789 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:46:07,791 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:46:07,792 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:46:07,794 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:46:07,797 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:46:07,802 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:46:07,804 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:46:07,805 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:46:07,807 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:46:07,817 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:46:07,819 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:46:07,820 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:46:07,824 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:46:07,825 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:46:07,834 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:46:07,835 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:46:07,835 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:46:07,837 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:46:07,838 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:46:07,840 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:46:07,840 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:46:07,841 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:46:07,843 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:46:07,844 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:46:07,846 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:46:07,846 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:46:07,847 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:46:07,847 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:46:07,847 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:46:07,848 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:46:07,849 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:46:07,850 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:46:07,894 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:46:07,894 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:46:07,895 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:46:07,895 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:46:07,902 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:46:07,902 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:46:07,903 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:46:07,903 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:46:07,903 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:46:07,903 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:46:07,904 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:46:07,905 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:46:07,905 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:46:07,905 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:46:07,905 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:46:07,905 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:46:07,906 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:46:07,906 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:46:07,906 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:46:07,907 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:46:07,907 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:46:07,907 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:46:07,907 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:46:07,907 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:46:07,908 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:46:07,908 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:46:07,909 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:46:07,910 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:46:07,910 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:46:07,910 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:46:07,910 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:46:07,911 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:46:07,911 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:46:07,911 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:46:07,911 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:46:07,911 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:46:07,912 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:46:07,912 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:46:07,912 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:46:07,912 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:46:07,912 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:46:07,912 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_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1d5f7b2f1816dd8d73aabb707e1456dfc72cb3843c81f782dda241fa9bcec7fd [2021-11-23 16:46:08,225 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:46:08,262 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:46:08,266 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:46:08,267 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:46:08,268 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:46:08,269 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c [2021-11-23 16:46:08,370 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/data/263e9cb0e/9db7e8518d4e4838aa532761d6e062bf/FLAGb67466ed5 [2021-11-23 16:46:09,217 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:46:09,218 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c [2021-11-23 16:46:09,261 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/data/263e9cb0e/9db7e8518d4e4838aa532761d6e062bf/FLAGb67466ed5 [2021-11-23 16:46:09,706 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/data/263e9cb0e/9db7e8518d4e4838aa532761d6e062bf [2021-11-23 16:46:09,709 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:46:09,710 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:46:09,712 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:46:09,712 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:46:09,716 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:46:09,717 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:46:09" (1/1) ... [2021-11-23 16:46:09,718 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27ec82c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:09, skipping insertion in model container [2021-11-23 16:46:09,719 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:46:09" (1/1) ... [2021-11-23 16:46:09,726 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:46:09,891 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:46:10,330 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c[6391,6404] [2021-11-23 16:46:10,435 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c[14139,14152] [2021-11-23 16:46:11,439 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:46:11,449 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:46:11,495 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c[6391,6404] [2021-11-23 16:46:11,521 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c[14139,14152] [2021-11-23 16:46:12,093 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:46:12,159 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:46:12,160 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:12 WrapperNode [2021-11-23 16:46:12,160 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:46:12,161 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:46:12,162 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:46:12,162 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:46:12,170 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:12" (1/1) ... [2021-11-23 16:46:12,239 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:12" (1/1) ... [2021-11-23 16:46:12,681 INFO L137 Inliner]: procedures = 33, calls = 19, calls flagged for inlining = 14, calls inlined = 14, statements flattened = 4977 [2021-11-23 16:46:12,682 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:46:12,682 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:46:12,683 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:46:12,683 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:46:12,692 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:12" (1/1) ... [2021-11-23 16:46:12,693 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:12" (1/1) ... [2021-11-23 16:46:12,753 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:12" (1/1) ... [2021-11-23 16:46:12,754 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:12" (1/1) ... [2021-11-23 16:46:13,009 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:12" (1/1) ... [2021-11-23 16:46:13,057 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:12" (1/1) ... [2021-11-23 16:46:13,114 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:12" (1/1) ... [2021-11-23 16:46:13,266 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:46:13,268 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:46:13,268 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:46:13,268 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:46:13,269 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:12" (1/1) ... [2021-11-23 16:46:13,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:46:13,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:46:13,335 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:46:13,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:46:13,444 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:46:13,445 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:46:13,445 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:46:13,445 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:46:13,624 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:46:13,642 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:46:18,689 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:46:18,766 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 16:46:18,772 INFO L158 Benchmark]: Toolchain (without parser) took 9059.88ms. Allocated memory was 132.1MB in the beginning and 482.3MB in the end (delta: 350.2MB). Free memory was 82.4MB in the beginning and 264.1MB in the end (delta: -181.7MB). Peak memory consumption was 192.2MB. Max. memory is 16.1GB. [2021-11-23 16:46:18,774 INFO L158 Benchmark]: CDTParser took 0.34ms. Allocated memory is still 132.1MB. Free memory was 114.0MB in the beginning and 113.8MB in the end (delta: 152.8kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:46:18,775 INFO L158 Benchmark]: CACSL2BoogieTranslator took 2448.55ms. Allocated memory was 132.1MB in the beginning and 184.5MB in the end (delta: 52.4MB). Free memory was 82.1MB in the beginning and 129.6MB in the end (delta: -47.5MB). Peak memory consumption was 53.1MB. Max. memory is 16.1GB. [2021-11-23 16:46:18,777 INFO L158 Benchmark]: Boogie Procedure Inliner took 520.48ms. Allocated memory is still 184.5MB. Free memory was 129.6MB in the beginning and 88.7MB in the end (delta: 41.0MB). Peak memory consumption was 85.2MB. Max. memory is 16.1GB. [2021-11-23 16:46:18,778 INFO L158 Benchmark]: Boogie Preprocessor took 584.09ms. Allocated memory is still 184.5MB. Free memory was 88.7MB in the beginning and 71.2MB in the end (delta: 17.4MB). Peak memory consumption was 53.5MB. Max. memory is 16.1GB. [2021-11-23 16:46:18,779 INFO L158 Benchmark]: RCFGBuilder took 5501.40ms. Allocated memory was 184.5MB in the beginning and 482.3MB in the end (delta: 297.8MB). Free memory was 71.2MB in the beginning and 264.1MB in the end (delta: -192.9MB). Peak memory consumption was 128.4MB. Max. memory is 16.1GB. [2021-11-23 16:46:18,788 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34ms. Allocated memory is still 132.1MB. Free memory was 114.0MB in the beginning and 113.8MB in the end (delta: 152.8kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 2448.55ms. Allocated memory was 132.1MB in the beginning and 184.5MB in the end (delta: 52.4MB). Free memory was 82.1MB in the beginning and 129.6MB in the end (delta: -47.5MB). Peak memory consumption was 53.1MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 520.48ms. Allocated memory is still 184.5MB. Free memory was 129.6MB in the beginning and 88.7MB in the end (delta: 41.0MB). Peak memory consumption was 85.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 584.09ms. Allocated memory is still 184.5MB. Free memory was 88.7MB in the beginning and 71.2MB in the end (delta: 17.4MB). Peak memory consumption was 53.5MB. Max. memory is 16.1GB. * RCFGBuilder took 5501.40ms. Allocated memory was 184.5MB in the beginning and 482.3MB in the end (delta: 297.8MB). Free memory was 71.2MB in the beginning and 264.1MB in the end (delta: -192.9MB). Peak memory consumption was 128.4MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 16:46:18,811 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1d5f7b2f1816dd8d73aabb707e1456dfc72cb3843c81f782dda241fa9bcec7fd --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:46:21,382 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:46:21,385 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:46:21,440 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:46:21,441 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:46:21,445 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:46:21,447 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:46:21,451 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:46:21,455 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:46:21,462 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:46:21,464 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:46:21,465 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:46:21,466 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:46:21,468 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:46:21,471 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:46:21,475 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:46:21,477 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:46:21,478 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:46:21,480 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:46:21,488 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:46:21,490 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:46:21,491 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:46:21,494 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:46:21,496 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:46:21,505 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:46:21,506 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:46:21,506 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:46:21,508 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:46:21,509 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:46:21,510 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:46:21,510 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:46:21,511 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:46:21,513 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:46:21,514 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:46:21,516 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:46:21,516 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:46:21,517 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:46:21,517 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:46:21,517 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:46:21,519 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:46:21,520 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:46:21,525 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:46:21,567 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:46:21,568 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:46:21,569 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:46:21,569 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:46:21,570 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:46:21,570 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:46:21,570 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:46:21,571 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:46:21,571 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:46:21,571 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:46:21,572 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:46:21,573 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:46:21,574 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:46:21,575 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:46:21,575 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:46:21,575 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:46:21,575 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:46:21,575 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:46:21,576 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:46:21,576 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:46:21,576 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:46:21,576 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:46:21,577 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:46:21,577 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:46:21,577 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:46:21,577 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:46:21,577 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:46:21,578 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:46:21,578 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:46:21,578 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:46:21,578 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:46:21,579 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:46:21,579 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:46:21,580 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:46:21,580 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:46:21,580 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:46:21,580 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:46:21,581 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:46:21,581 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_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1d5f7b2f1816dd8d73aabb707e1456dfc72cb3843c81f782dda241fa9bcec7fd [2021-11-23 16:46:21,972 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:46:22,006 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:46:22,009 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:46:22,010 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:46:22,011 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:46:22,013 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c [2021-11-23 16:46:22,095 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/data/6e8c2085a/fe1489ef2bd24f0fb9f3fdc1b621913a/FLAG3180b513d [2021-11-23 16:46:22,956 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:46:22,973 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c [2021-11-23 16:46:23,003 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/data/6e8c2085a/fe1489ef2bd24f0fb9f3fdc1b621913a/FLAG3180b513d [2021-11-23 16:46:23,466 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/data/6e8c2085a/fe1489ef2bd24f0fb9f3fdc1b621913a [2021-11-23 16:46:23,468 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:46:23,470 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:46:23,472 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:46:23,472 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:46:23,483 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:46:23,485 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:46:23" (1/1) ... [2021-11-23 16:46:23,486 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@36919e63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:23, skipping insertion in model container [2021-11-23 16:46:23,487 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:46:23" (1/1) ... [2021-11-23 16:46:23,494 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:46:23,639 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:46:24,129 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c[6391,6404] [2021-11-23 16:46:24,196 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c[14139,14152] [2021-11-23 16:46:25,472 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:46:25,486 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:46:25,536 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c[6391,6404] [2021-11-23 16:46:25,577 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/sv-benchmarks/c/combinations/pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c[14139,14152] [2021-11-23 16:46:26,221 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:46:26,255 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:46:26,256 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26 WrapperNode [2021-11-23 16:46:26,256 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:46:26,258 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:46:26,258 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:46:26,258 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:46:26,266 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26" (1/1) ... [2021-11-23 16:46:26,352 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26" (1/1) ... [2021-11-23 16:46:26,554 INFO L137 Inliner]: procedures = 34, calls = 19, calls flagged for inlining = 14, calls inlined = 14, statements flattened = 4958 [2021-11-23 16:46:26,555 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:46:26,556 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:46:26,557 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:46:26,557 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:46:26,566 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26" (1/1) ... [2021-11-23 16:46:26,566 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26" (1/1) ... [2021-11-23 16:46:26,618 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26" (1/1) ... [2021-11-23 16:46:26,619 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26" (1/1) ... [2021-11-23 16:46:26,831 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26" (1/1) ... [2021-11-23 16:46:26,888 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26" (1/1) ... [2021-11-23 16:46:26,920 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26" (1/1) ... [2021-11-23 16:46:26,977 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:46:26,978 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:46:26,979 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:46:26,979 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:46:26,980 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26" (1/1) ... [2021-11-23 16:46:26,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:46:27,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:46:27,041 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:46:27,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:46:27,110 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:46:27,110 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:46:27,110 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:46:27,111 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:46:27,258 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:46:27,260 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:46:58,259 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:46:58,287 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:46:58,287 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 16:46:58,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:46:58 BoogieIcfgContainer [2021-11-23 16:46:58,292 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:46:58,294 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:46:58,294 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:46:58,297 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:46:58,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:46:23" (1/3) ... [2021-11-23 16:46:58,299 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@102d4ba5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:46:58, skipping insertion in model container [2021-11-23 16:46:58,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:46:26" (2/3) ... [2021-11-23 16:46:58,299 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@102d4ba5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:46:58, skipping insertion in model container [2021-11-23 16:46:58,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:46:58" (3/3) ... [2021-11-23 16:46:58,301 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.1.ufo.BOUNDED-6.pals+Problem12_label09.c [2021-11-23 16:46:58,307 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:46:58,308 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 16:46:58,372 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:46:58,381 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 16:46:58,382 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 16:46:58,427 INFO L276 IsEmpty]: Start isEmpty. Operand has 878 states, 875 states have (on average 1.904) internal successors, (1666), 877 states have internal predecessors, (1666), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:46:58,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 16:46:58,440 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:46:58,441 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:46:58,442 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:46:58,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:46:58,452 INFO L85 PathProgramCache]: Analyzing trace with hash 975463267, now seen corresponding path program 1 times [2021-11-23 16:46:58,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:46:58,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [257023494] [2021-11-23 16:46:58,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:58,469 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:46:58,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:46:58,471 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:46:58,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:46:58,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:58,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 16:46:58,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:58,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:58,748 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:46:58,749 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:46:58,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [257023494] [2021-11-23 16:46:58,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [257023494] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:46:58,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:46:58,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:46:58,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772799170] [2021-11-23 16:46:58,760 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:46:58,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 16:46:58,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:46:58,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 16:46:58,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 16:46:58,837 INFO L87 Difference]: Start difference. First operand has 878 states, 875 states have (on average 1.904) internal successors, (1666), 877 states have internal predecessors, (1666), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:46:58,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:46:58,963 INFO L93 Difference]: Finished difference Result 1734 states and 3292 transitions. [2021-11-23 16:46:58,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 16:46:58,966 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-23 16:46:58,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:46:58,989 INFO L225 Difference]: With dead ends: 1734 [2021-11-23 16:46:58,990 INFO L226 Difference]: Without dead ends: 812 [2021-11-23 16:46:58,998 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 16:46:59,003 INFO L933 BasicCegarLoop]: 1600 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1600 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:46:59,010 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1600 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:46:59,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 812 states. [2021-11-23 16:46:59,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 812 to 812. [2021-11-23 16:46:59,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 812 states, 810 states have (on average 1.8925925925925926) internal successors, (1533), 811 states have internal predecessors, (1533), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:46:59,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1533 transitions. [2021-11-23 16:46:59,147 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1533 transitions. Word has length 26 [2021-11-23 16:46:59,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:46:59,148 INFO L470 AbstractCegarLoop]: Abstraction has 812 states and 1533 transitions. [2021-11-23 16:46:59,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:46:59,149 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1533 transitions. [2021-11-23 16:46:59,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 16:46:59,151 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:46:59,152 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:46:59,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 16:46:59,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:46:59,365 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:46:59,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:46:59,366 INFO L85 PathProgramCache]: Analyzing trace with hash 157814817, now seen corresponding path program 1 times [2021-11-23 16:46:59,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:46:59,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1554241439] [2021-11-23 16:46:59,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:46:59,368 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:46:59,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:46:59,370 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:46:59,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:46:59,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:46:59,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:46:59,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:46:59,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:46:59,583 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:46:59,583 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:46:59,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1554241439] [2021-11-23 16:46:59,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1554241439] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:46:59,584 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:46:59,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:46:59,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694302969] [2021-11-23 16:46:59,585 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:46:59,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:46:59,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:46:59,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:46:59,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:46:59,588 INFO L87 Difference]: Start difference. First operand 812 states and 1533 transitions. Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:46:59,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:46:59,746 INFO L93 Difference]: Finished difference Result 888 states and 1649 transitions. [2021-11-23 16:46:59,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:46:59,751 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-23 16:46:59,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:46:59,759 INFO L225 Difference]: With dead ends: 888 [2021-11-23 16:46:59,759 INFO L226 Difference]: Without dead ends: 848 [2021-11-23 16:46:59,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:46:59,763 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 58 mSDsluCounter, 4566 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 6095 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:46:59,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 6095 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:46:59,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 848 states. [2021-11-23 16:46:59,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 848 to 812. [2021-11-23 16:46:59,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 812 states, 810 states have (on average 1.8728395061728396) internal successors, (1517), 811 states have internal predecessors, (1517), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:46:59,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1517 transitions. [2021-11-23 16:46:59,804 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1517 transitions. Word has length 26 [2021-11-23 16:46:59,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:46:59,804 INFO L470 AbstractCegarLoop]: Abstraction has 812 states and 1517 transitions. [2021-11-23 16:46:59,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:46:59,805 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1517 transitions. [2021-11-23 16:46:59,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 16:46:59,813 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:46:59,813 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:46:59,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:00,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:00,024 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:00,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:00,025 INFO L85 PathProgramCache]: Analyzing trace with hash -1324654887, now seen corresponding path program 1 times [2021-11-23 16:47:00,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:00,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1631609758] [2021-11-23 16:47:00,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:00,027 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:00,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:00,028 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:00,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:47:00,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:00,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:47:00,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:00,290 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:00,290 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:00,291 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:00,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1631609758] [2021-11-23 16:47:00,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1631609758] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:00,291 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:00,292 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:47:00,292 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982982756] [2021-11-23 16:47:00,292 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:00,293 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:00,293 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:00,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:00,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:00,294 INFO L87 Difference]: Start difference. First operand 812 states and 1517 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:00,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:00,383 INFO L93 Difference]: Finished difference Result 878 states and 1619 transitions. [2021-11-23 16:47:00,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:47:00,384 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 16:47:00,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:00,390 INFO L225 Difference]: With dead ends: 878 [2021-11-23 16:47:00,390 INFO L226 Difference]: Without dead ends: 842 [2021-11-23 16:47:00,391 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:00,393 INFO L933 BasicCegarLoop]: 1559 mSDtfsCounter, 1485 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1485 SdHoareTripleChecker+Valid, 1613 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:00,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1485 Valid, 1613 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:00,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2021-11-23 16:47:00,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 840. [2021-11-23 16:47:00,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 840 states, 838 states have (on average 1.8627684964200477) internal successors, (1561), 839 states have internal predecessors, (1561), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:00,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 840 states to 840 states and 1561 transitions. [2021-11-23 16:47:00,435 INFO L78 Accepts]: Start accepts. Automaton has 840 states and 1561 transitions. Word has length 41 [2021-11-23 16:47:00,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:00,435 INFO L470 AbstractCegarLoop]: Abstraction has 840 states and 1561 transitions. [2021-11-23 16:47:00,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:00,436 INFO L276 IsEmpty]: Start isEmpty. Operand 840 states and 1561 transitions. [2021-11-23 16:47:00,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 16:47:00,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:00,438 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:00,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:00,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:00,654 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:00,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:00,655 INFO L85 PathProgramCache]: Analyzing trace with hash 1376027727, now seen corresponding path program 1 times [2021-11-23 16:47:00,656 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:00,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [643827314] [2021-11-23 16:47:00,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:00,656 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:00,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:00,658 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:00,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 16:47:00,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:00,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:47:00,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:01,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:01,390 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:01,390 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:01,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [643827314] [2021-11-23 16:47:01,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [643827314] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:01,391 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:01,391 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:47:01,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853685862] [2021-11-23 16:47:01,392 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:01,392 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:47:01,392 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:01,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:47:01,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:01,393 INFO L87 Difference]: Start difference. First operand 840 states and 1561 transitions. Second operand has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:01,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:01,599 INFO L93 Difference]: Finished difference Result 1096 states and 1961 transitions. [2021-11-23 16:47:01,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:47:01,600 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 16:47:01,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:01,608 INFO L225 Difference]: With dead ends: 1096 [2021-11-23 16:47:01,608 INFO L226 Difference]: Without dead ends: 1032 [2021-11-23 16:47:01,615 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:01,619 INFO L933 BasicCegarLoop]: 1511 mSDtfsCounter, 1678 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1678 SdHoareTripleChecker+Valid, 1680 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:01,620 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1678 Valid, 1680 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:47:01,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1032 states. [2021-11-23 16:47:01,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1032 to 964. [2021-11-23 16:47:01,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 964 states, 962 states have (on average 1.8222453222453223) internal successors, (1753), 963 states have internal predecessors, (1753), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:01,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 964 states to 964 states and 1753 transitions. [2021-11-23 16:47:01,658 INFO L78 Accepts]: Start accepts. Automaton has 964 states and 1753 transitions. Word has length 41 [2021-11-23 16:47:01,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:01,659 INFO L470 AbstractCegarLoop]: Abstraction has 964 states and 1753 transitions. [2021-11-23 16:47:01,660 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:01,660 INFO L276 IsEmpty]: Start isEmpty. Operand 964 states and 1753 transitions. [2021-11-23 16:47:01,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 16:47:01,664 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:01,664 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:01,681 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:01,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:01,877 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:01,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:01,878 INFO L85 PathProgramCache]: Analyzing trace with hash -1902982177, now seen corresponding path program 1 times [2021-11-23 16:47:01,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:01,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1280249595] [2021-11-23 16:47:01,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:01,879 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:01,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:01,880 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:01,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 16:47:01,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:01,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:47:01,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:02,168 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:02,169 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:02,169 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:02,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1280249595] [2021-11-23 16:47:02,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1280249595] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:02,170 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:02,170 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:47:02,170 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628617364] [2021-11-23 16:47:02,170 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:02,171 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:02,171 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:02,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:02,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:02,172 INFO L87 Difference]: Start difference. First operand 964 states and 1753 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:02,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:02,247 INFO L93 Difference]: Finished difference Result 1242 states and 2182 transitions. [2021-11-23 16:47:02,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:47:02,248 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 16:47:02,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:02,256 INFO L225 Difference]: With dead ends: 1242 [2021-11-23 16:47:02,257 INFO L226 Difference]: Without dead ends: 1054 [2021-11-23 16:47:02,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:02,259 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 1469 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1469 SdHoareTripleChecker+Valid, 1565 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:02,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1469 Valid, 1565 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:02,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1054 states. [2021-11-23 16:47:02,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1054 to 1052. [2021-11-23 16:47:02,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1052 states, 1050 states have (on average 1.7942857142857143) internal successors, (1884), 1051 states have internal predecessors, (1884), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:02,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1052 states to 1052 states and 1884 transitions. [2021-11-23 16:47:02,300 INFO L78 Accepts]: Start accepts. Automaton has 1052 states and 1884 transitions. Word has length 43 [2021-11-23 16:47:02,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:02,301 INFO L470 AbstractCegarLoop]: Abstraction has 1052 states and 1884 transitions. [2021-11-23 16:47:02,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:02,301 INFO L276 IsEmpty]: Start isEmpty. Operand 1052 states and 1884 transitions. [2021-11-23 16:47:02,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 16:47:02,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:02,302 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:02,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:02,516 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:02,516 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:02,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:02,517 INFO L85 PathProgramCache]: Analyzing trace with hash -47574589, now seen corresponding path program 1 times [2021-11-23 16:47:02,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:02,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [439755219] [2021-11-23 16:47:02,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:02,518 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:02,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:02,520 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:02,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 16:47:02,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:02,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:47:02,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:02,750 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:02,750 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:02,750 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:02,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [439755219] [2021-11-23 16:47:02,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [439755219] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:02,751 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:02,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:47:02,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889877766] [2021-11-23 16:47:02,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:02,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:02,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:02,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:02,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:02,753 INFO L87 Difference]: Start difference. First operand 1052 states and 1884 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:02,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:02,819 INFO L93 Difference]: Finished difference Result 1546 states and 2636 transitions. [2021-11-23 16:47:02,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:47:02,820 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 16:47:02,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:02,830 INFO L225 Difference]: With dead ends: 1546 [2021-11-23 16:47:02,830 INFO L226 Difference]: Without dead ends: 1272 [2021-11-23 16:47:02,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:02,832 INFO L933 BasicCegarLoop]: 1541 mSDtfsCounter, 1477 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1477 SdHoareTripleChecker+Valid, 1603 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:02,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1477 Valid, 1603 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:02,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2021-11-23 16:47:02,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 1270. [2021-11-23 16:47:02,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1270 states, 1268 states have (on average 1.7389589905362777) internal successors, (2205), 1269 states have internal predecessors, (2205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:02,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1270 states to 1270 states and 2205 transitions. [2021-11-23 16:47:02,885 INFO L78 Accepts]: Start accepts. Automaton has 1270 states and 2205 transitions. Word has length 43 [2021-11-23 16:47:02,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:02,886 INFO L470 AbstractCegarLoop]: Abstraction has 1270 states and 2205 transitions. [2021-11-23 16:47:02,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:02,886 INFO L276 IsEmpty]: Start isEmpty. Operand 1270 states and 2205 transitions. [2021-11-23 16:47:02,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 16:47:02,887 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:02,887 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:02,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:03,102 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:03,102 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:03,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:03,103 INFO L85 PathProgramCache]: Analyzing trace with hash 1199933027, now seen corresponding path program 1 times [2021-11-23 16:47:03,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:03,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1116818393] [2021-11-23 16:47:03,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:03,104 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:03,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:03,106 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:03,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 16:47:03,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:03,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:47:03,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:03,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:03,352 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:03,352 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:03,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1116818393] [2021-11-23 16:47:03,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1116818393] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:03,353 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:03,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:47:03,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042807751] [2021-11-23 16:47:03,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:03,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:03,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:03,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:03,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:03,355 INFO L87 Difference]: Start difference. First operand 1270 states and 2205 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:03,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:03,432 INFO L93 Difference]: Finished difference Result 2146 states and 3509 transitions. [2021-11-23 16:47:03,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:47:03,432 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 16:47:03,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:03,444 INFO L225 Difference]: With dead ends: 2146 [2021-11-23 16:47:03,444 INFO L226 Difference]: Without dead ends: 1654 [2021-11-23 16:47:03,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:03,447 INFO L933 BasicCegarLoop]: 1554 mSDtfsCounter, 1481 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1481 SdHoareTripleChecker+Valid, 1612 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:03,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1481 Valid, 1612 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:03,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1654 states. [2021-11-23 16:47:03,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1654 to 1652. [2021-11-23 16:47:03,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1652 states, 1650 states have (on average 1.6654545454545455) internal successors, (2748), 1651 states have internal predecessors, (2748), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:03,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1652 states to 1652 states and 2748 transitions. [2021-11-23 16:47:03,517 INFO L78 Accepts]: Start accepts. Automaton has 1652 states and 2748 transitions. Word has length 43 [2021-11-23 16:47:03,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:03,518 INFO L470 AbstractCegarLoop]: Abstraction has 1652 states and 2748 transitions. [2021-11-23 16:47:03,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:03,518 INFO L276 IsEmpty]: Start isEmpty. Operand 1652 states and 2748 transitions. [2021-11-23 16:47:03,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 16:47:03,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:03,519 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:03,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:03,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:03,744 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:03,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:03,745 INFO L85 PathProgramCache]: Analyzing trace with hash -1511296967, now seen corresponding path program 1 times [2021-11-23 16:47:03,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:03,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [760196808] [2021-11-23 16:47:03,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:03,746 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:03,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:03,746 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:03,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 16:47:03,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:03,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:47:03,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:03,942 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:03,943 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:03,943 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:03,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [760196808] [2021-11-23 16:47:03,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [760196808] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:03,944 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:03,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:47:03,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999212225] [2021-11-23 16:47:03,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:03,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:47:03,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:03,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:47:03,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:03,946 INFO L87 Difference]: Start difference. First operand 1652 states and 2748 transitions. Second operand has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:04,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:04,205 INFO L93 Difference]: Finished difference Result 2498 states and 3940 transitions. [2021-11-23 16:47:04,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:47:04,206 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-23 16:47:04,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:04,222 INFO L225 Difference]: With dead ends: 2498 [2021-11-23 16:47:04,222 INFO L226 Difference]: Without dead ends: 2496 [2021-11-23 16:47:04,223 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:47:04,224 INFO L933 BasicCegarLoop]: 1534 mSDtfsCounter, 139 mSDsluCounter, 4544 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 6078 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:04,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 6078 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:47:04,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2496 states. [2021-11-23 16:47:04,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2496 to 1736. [2021-11-23 16:47:04,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1736 states, 1734 states have (on average 1.6309111880046137) internal successors, (2828), 1735 states have internal predecessors, (2828), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:04,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1736 states to 1736 states and 2828 transitions. [2021-11-23 16:47:04,323 INFO L78 Accepts]: Start accepts. Automaton has 1736 states and 2828 transitions. Word has length 44 [2021-11-23 16:47:04,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:04,324 INFO L470 AbstractCegarLoop]: Abstraction has 1736 states and 2828 transitions. [2021-11-23 16:47:04,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:04,324 INFO L276 IsEmpty]: Start isEmpty. Operand 1736 states and 2828 transitions. [2021-11-23 16:47:04,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 16:47:04,326 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:04,326 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:04,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:04,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:04,540 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:04,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:04,541 INFO L85 PathProgramCache]: Analyzing trace with hash -213997176, now seen corresponding path program 1 times [2021-11-23 16:47:04,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:04,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1099077533] [2021-11-23 16:47:04,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:04,541 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:04,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:04,542 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:04,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 16:47:04,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:04,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:04,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:05,959 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:05,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:06,978 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:06,978 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:06,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1099077533] [2021-11-23 16:47:06,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1099077533] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:06,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1666037362] [2021-11-23 16:47:06,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:06,980 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:06,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:06,985 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:07,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-23 16:47:07,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:07,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:07,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:07,340 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:07,340 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:07,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1666037362] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:07,340 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:47:07,341 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 16:47:07,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720947654] [2021-11-23 16:47:07,341 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:07,342 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:07,342 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:07,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:07,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 16:47:07,343 INFO L87 Difference]: Start difference. First operand 1736 states and 2828 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:07,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:07,446 INFO L93 Difference]: Finished difference Result 2696 states and 4194 transitions. [2021-11-23 16:47:07,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:47:07,447 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 16:47:07,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:07,459 INFO L225 Difference]: With dead ends: 2696 [2021-11-23 16:47:07,459 INFO L226 Difference]: Without dead ends: 1738 [2021-11-23 16:47:07,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 16:47:07,466 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 33 mSDsluCounter, 1504 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 3042 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:07,467 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 3042 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:07,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1738 states. [2021-11-23 16:47:07,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1738 to 1736. [2021-11-23 16:47:07,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1736 states, 1734 states have (on average 1.6205305651672435) internal successors, (2810), 1735 states have internal predecessors, (2810), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:07,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1736 states to 1736 states and 2810 transitions. [2021-11-23 16:47:07,557 INFO L78 Accepts]: Start accepts. Automaton has 1736 states and 2810 transitions. Word has length 64 [2021-11-23 16:47:07,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:07,558 INFO L470 AbstractCegarLoop]: Abstraction has 1736 states and 2810 transitions. [2021-11-23 16:47:07,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:07,559 INFO L276 IsEmpty]: Start isEmpty. Operand 1736 states and 2810 transitions. [2021-11-23 16:47:07,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 16:47:07,560 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:07,560 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:07,566 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:07,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:07,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:07,963 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:07,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:07,963 INFO L85 PathProgramCache]: Analyzing trace with hash 1584307858, now seen corresponding path program 1 times [2021-11-23 16:47:07,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:07,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [919812725] [2021-11-23 16:47:07,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:07,964 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:07,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:07,966 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:08,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 16:47:08,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:08,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:08,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:09,291 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:09,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:10,269 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:10,270 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:10,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [919812725] [2021-11-23 16:47:10,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [919812725] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:10,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1703970814] [2021-11-23 16:47:10,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:10,270 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:10,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:10,272 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:10,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 16:47:10,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:10,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:10,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:11,400 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:11,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:12,073 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:12,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1703970814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:12,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398415440] [2021-11-23 16:47:12,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:12,074 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:12,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:12,078 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:12,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 16:47:12,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:12,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:12,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:13,110 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:13,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:13,766 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:13,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398415440] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:13,766 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:13,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:47:13,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659532594] [2021-11-23 16:47:13,767 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:13,768 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:47:13,768 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:13,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:47:13,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:47:13,769 INFO L87 Difference]: Start difference. First operand 1736 states and 2810 transitions. Second operand has 16 states, 16 states have (on average 6.9375) internal successors, (111), 15 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:14,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:14,281 INFO L93 Difference]: Finished difference Result 2433 states and 3800 transitions. [2021-11-23 16:47:14,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:47:14,281 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 6.9375) internal successors, (111), 15 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 16:47:14,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:14,293 INFO L225 Difference]: With dead ends: 2433 [2021-11-23 16:47:14,294 INFO L226 Difference]: Without dead ends: 1759 [2021-11-23 16:47:14,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 364 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:47:14,296 INFO L933 BasicCegarLoop]: 1502 mSDtfsCounter, 4354 mSDsluCounter, 9127 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4354 SdHoareTripleChecker+Valid, 10629 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 50 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:14,298 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4354 Valid, 10629 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 65 Invalid, 0 Unknown, 50 Unchecked, 0.1s Time] [2021-11-23 16:47:14,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1759 states. [2021-11-23 16:47:14,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1759 to 1758. [2021-11-23 16:47:14,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1758 states, 1756 states have (on average 1.6150341685649203) internal successors, (2836), 1757 states have internal predecessors, (2836), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:14,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1758 states to 1758 states and 2836 transitions. [2021-11-23 16:47:14,391 INFO L78 Accepts]: Start accepts. Automaton has 1758 states and 2836 transitions. Word has length 64 [2021-11-23 16:47:14,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:14,391 INFO L470 AbstractCegarLoop]: Abstraction has 1758 states and 2836 transitions. [2021-11-23 16:47:14,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 6.9375) internal successors, (111), 15 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:14,392 INFO L276 IsEmpty]: Start isEmpty. Operand 1758 states and 2836 transitions. [2021-11-23 16:47:14,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 16:47:14,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:14,393 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:14,431 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:14,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:14,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:15,013 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:15,013 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:15,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:15,014 INFO L85 PathProgramCache]: Analyzing trace with hash -2129817016, now seen corresponding path program 1 times [2021-11-23 16:47:15,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:15,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [877047941] [2021-11-23 16:47:15,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:15,015 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:15,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:15,016 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:15,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 16:47:15,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:15,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:15,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:16,830 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:16,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:17,491 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:17,492 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:17,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [877047941] [2021-11-23 16:47:17,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [877047941] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:17,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1202959747] [2021-11-23 16:47:17,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:17,492 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:17,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:17,494 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:17,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 16:47:17,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:17,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:47:17,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:17,808 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:17,808 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:17,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1202959747] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:17,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:47:17,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 16:47:17,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152317014] [2021-11-23 16:47:17,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:17,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:17,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:17,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:17,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 16:47:17,810 INFO L87 Difference]: Start difference. First operand 1758 states and 2836 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:17,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:17,901 INFO L93 Difference]: Finished difference Result 2240 states and 3511 transitions. [2021-11-23 16:47:17,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:47:17,902 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 16:47:17,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:17,912 INFO L225 Difference]: With dead ends: 2240 [2021-11-23 16:47:17,912 INFO L226 Difference]: Without dead ends: 1282 [2021-11-23 16:47:17,914 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 16:47:17,915 INFO L933 BasicCegarLoop]: 1531 mSDtfsCounter, 27 mSDsluCounter, 1496 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 3027 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:17,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 3027 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:17,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1282 states. [2021-11-23 16:47:17,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1282 to 1280. [2021-11-23 16:47:17,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1280 states, 1278 states have (on average 1.6854460093896713) internal successors, (2154), 1279 states have internal predecessors, (2154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:17,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1280 states to 1280 states and 2154 transitions. [2021-11-23 16:47:17,983 INFO L78 Accepts]: Start accepts. Automaton has 1280 states and 2154 transitions. Word has length 64 [2021-11-23 16:47:17,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:17,983 INFO L470 AbstractCegarLoop]: Abstraction has 1280 states and 2154 transitions. [2021-11-23 16:47:17,984 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:17,984 INFO L276 IsEmpty]: Start isEmpty. Operand 1280 states and 2154 transitions. [2021-11-23 16:47:17,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 16:47:17,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:17,986 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:17,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:18,213 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:18,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:18,404 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:18,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:18,405 INFO L85 PathProgramCache]: Analyzing trace with hash 947164882, now seen corresponding path program 1 times [2021-11-23 16:47:18,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:18,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1157528878] [2021-11-23 16:47:18,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:18,406 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:18,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:18,408 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:18,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 16:47:18,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:18,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:18,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:20,314 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:20,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:20,889 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:20,889 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:20,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1157528878] [2021-11-23 16:47:20,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1157528878] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:20,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1987560469] [2021-11-23 16:47:20,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:20,890 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:20,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:20,897 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:20,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 16:47:21,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:21,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:21,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:22,364 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:22,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:22,736 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:22,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1987560469] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:22,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935486054] [2021-11-23 16:47:22,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:22,737 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:22,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:22,738 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:22,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 16:47:22,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:22,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:22,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:24,088 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:24,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:24,451 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:24,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935486054] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:24,452 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:24,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:47:24,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547937479] [2021-11-23 16:47:24,453 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:24,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:47:24,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:24,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:47:24,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:47:24,455 INFO L87 Difference]: Start difference. First operand 1280 states and 2154 transitions. Second operand has 16 states, 16 states have (on average 7.3125) internal successors, (117), 15 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:24,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:24,838 INFO L93 Difference]: Finished difference Result 1647 states and 2663 transitions. [2021-11-23 16:47:24,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 16:47:24,839 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.3125) internal successors, (117), 15 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 16:47:24,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:24,849 INFO L225 Difference]: With dead ends: 1647 [2021-11-23 16:47:24,849 INFO L226 Difference]: Without dead ends: 1309 [2021-11-23 16:47:24,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 365 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:47:24,852 INFO L933 BasicCegarLoop]: 1500 mSDtfsCounter, 5864 mSDsluCounter, 11920 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5864 SdHoareTripleChecker+Valid, 13420 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:24,852 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5864 Valid, 13420 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 73 Unchecked, 0.1s Time] [2021-11-23 16:47:24,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1309 states. [2021-11-23 16:47:24,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1309 to 1290. [2021-11-23 16:47:24,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1290 states, 1288 states have (on average 1.6816770186335404) internal successors, (2166), 1289 states have internal predecessors, (2166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:24,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1290 states to 1290 states and 2166 transitions. [2021-11-23 16:47:24,913 INFO L78 Accepts]: Start accepts. Automaton has 1290 states and 2166 transitions. Word has length 64 [2021-11-23 16:47:24,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:24,914 INFO L470 AbstractCegarLoop]: Abstraction has 1290 states and 2166 transitions. [2021-11-23 16:47:24,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.3125) internal successors, (117), 15 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:24,915 INFO L276 IsEmpty]: Start isEmpty. Operand 1290 states and 2166 transitions. [2021-11-23 16:47:24,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 16:47:24,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:24,919 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:24,929 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:25,132 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Ended with exit code 0 [2021-11-23 16:47:25,343 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-23 16:47:25,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:25,522 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:25,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:25,523 INFO L85 PathProgramCache]: Analyzing trace with hash -1514914168, now seen corresponding path program 1 times [2021-11-23 16:47:25,523 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:25,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1316228096] [2021-11-23 16:47:25,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:25,524 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:25,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:25,525 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:25,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 16:47:25,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:25,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:47:25,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:25,814 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:25,814 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:25,814 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:25,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1316228096] [2021-11-23 16:47:25,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1316228096] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:25,815 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:25,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:47:25,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50315502] [2021-11-23 16:47:25,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:25,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:47:25,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:25,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:47:25,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:25,817 INFO L87 Difference]: Start difference. First operand 1290 states and 2166 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:25,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:25,867 INFO L93 Difference]: Finished difference Result 1482 states and 2428 transitions. [2021-11-23 16:47:25,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:47:25,868 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 16:47:25,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:25,875 INFO L225 Difference]: With dead ends: 1482 [2021-11-23 16:47:25,875 INFO L226 Difference]: Without dead ends: 1002 [2021-11-23 16:47:25,877 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:47:25,878 INFO L933 BasicCegarLoop]: 1525 mSDtfsCounter, 17 mSDsluCounter, 1496 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 3021 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:25,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 3021 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:47:25,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1002 states. [2021-11-23 16:47:25,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1002 to 994. [2021-11-23 16:47:25,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 994 states, 992 states have (on average 1.7651209677419355) internal successors, (1751), 993 states have internal predecessors, (1751), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:25,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 994 states to 994 states and 1751 transitions. [2021-11-23 16:47:25,923 INFO L78 Accepts]: Start accepts. Automaton has 994 states and 1751 transitions. Word has length 64 [2021-11-23 16:47:25,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:25,923 INFO L470 AbstractCegarLoop]: Abstraction has 994 states and 1751 transitions. [2021-11-23 16:47:25,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:25,924 INFO L276 IsEmpty]: Start isEmpty. Operand 994 states and 1751 transitions. [2021-11-23 16:47:25,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 16:47:25,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:25,929 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:25,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:26,144 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:26,144 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:26,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:26,145 INFO L85 PathProgramCache]: Analyzing trace with hash -2009059564, now seen corresponding path program 1 times [2021-11-23 16:47:26,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:26,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1817805264] [2021-11-23 16:47:26,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:26,146 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:26,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:26,147 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:26,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 16:47:26,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:26,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:47:26,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:26,817 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 16:47:26,817 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:26,818 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:26,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1817805264] [2021-11-23 16:47:26,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1817805264] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:26,818 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:26,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:47:26,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863569693] [2021-11-23 16:47:26,818 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:26,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:47:26,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:26,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:47:26,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:47:26,820 INFO L87 Difference]: Start difference. First operand 994 states and 1751 transitions. Second operand has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:26,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:26,934 INFO L93 Difference]: Finished difference Result 1170 states and 1992 transitions. [2021-11-23 16:47:26,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:47:26,935 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 16:47:26,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:26,943 INFO L225 Difference]: With dead ends: 1170 [2021-11-23 16:47:26,943 INFO L226 Difference]: Without dead ends: 994 [2021-11-23 16:47:26,944 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:47:26,945 INFO L933 BasicCegarLoop]: 1506 mSDtfsCounter, 2899 mSDsluCounter, 2960 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2899 SdHoareTripleChecker+Valid, 4466 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:26,946 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2899 Valid, 4466 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 14 Unchecked, 0.0s Time] [2021-11-23 16:47:26,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 994 states. [2021-11-23 16:47:26,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 994 to 994. [2021-11-23 16:47:26,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 994 states, 992 states have (on average 1.7641129032258065) internal successors, (1750), 993 states have internal predecessors, (1750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:26,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 994 states to 994 states and 1750 transitions. [2021-11-23 16:47:26,989 INFO L78 Accepts]: Start accepts. Automaton has 994 states and 1750 transitions. Word has length 64 [2021-11-23 16:47:26,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:26,989 INFO L470 AbstractCegarLoop]: Abstraction has 994 states and 1750 transitions. [2021-11-23 16:47:26,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.166666666666666) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:26,990 INFO L276 IsEmpty]: Start isEmpty. Operand 994 states and 1750 transitions. [2021-11-23 16:47:26,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 16:47:26,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:26,991 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:27,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:27,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:27,205 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:27,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:27,206 INFO L85 PathProgramCache]: Analyzing trace with hash 740302356, now seen corresponding path program 1 times [2021-11-23 16:47:27,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:27,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1843777004] [2021-11-23 16:47:27,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:27,207 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:27,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:27,208 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:27,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 16:47:27,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:27,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:47:27,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:27,752 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:47:27,752 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:27,753 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:27,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1843777004] [2021-11-23 16:47:27,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1843777004] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:27,753 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:27,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:47:27,754 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287477228] [2021-11-23 16:47:27,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:27,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:47:27,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:27,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:47:27,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:47:27,756 INFO L87 Difference]: Start difference. First operand 994 states and 1750 transitions. Second operand has 6 states, 6 states have (on average 10.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:27,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:27,863 INFO L93 Difference]: Finished difference Result 1174 states and 1996 transitions. [2021-11-23 16:47:27,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:47:27,863 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 16:47:27,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:27,871 INFO L225 Difference]: With dead ends: 1174 [2021-11-23 16:47:27,871 INFO L226 Difference]: Without dead ends: 994 [2021-11-23 16:47:27,872 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:47:27,873 INFO L933 BasicCegarLoop]: 1509 mSDtfsCounter, 2899 mSDsluCounter, 1541 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2899 SdHoareTripleChecker+Valid, 3050 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:27,873 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2899 Valid, 3050 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 26 Unchecked, 0.0s Time] [2021-11-23 16:47:27,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 994 states. [2021-11-23 16:47:27,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 994 to 994. [2021-11-23 16:47:27,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 994 states, 992 states have (on average 1.7631048387096775) internal successors, (1749), 993 states have internal predecessors, (1749), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:27,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 994 states to 994 states and 1749 transitions. [2021-11-23 16:47:27,915 INFO L78 Accepts]: Start accepts. Automaton has 994 states and 1749 transitions. Word has length 64 [2021-11-23 16:47:27,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:27,916 INFO L470 AbstractCegarLoop]: Abstraction has 994 states and 1749 transitions. [2021-11-23 16:47:27,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:27,916 INFO L276 IsEmpty]: Start isEmpty. Operand 994 states and 1749 transitions. [2021-11-23 16:47:27,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 16:47:27,917 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:27,918 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:27,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:28,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:28,132 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:28,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:28,133 INFO L85 PathProgramCache]: Analyzing trace with hash -261059308, now seen corresponding path program 1 times [2021-11-23 16:47:28,133 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:28,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [39502085] [2021-11-23 16:47:28,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:28,134 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:28,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:28,135 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:28,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 16:47:28,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:28,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:47:28,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:28,796 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:47:28,796 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:28,796 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:28,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [39502085] [2021-11-23 16:47:28,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [39502085] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:28,796 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:28,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:47:28,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200805815] [2021-11-23 16:47:28,797 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:28,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:47:28,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:28,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:47:28,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:47:28,798 INFO L87 Difference]: Start difference. First operand 994 states and 1749 transitions. Second operand has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:28,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:28,928 INFO L93 Difference]: Finished difference Result 1164 states and 1984 transitions. [2021-11-23 16:47:28,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:47:28,929 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 16:47:28,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:28,936 INFO L225 Difference]: With dead ends: 1164 [2021-11-23 16:47:28,937 INFO L226 Difference]: Without dead ends: 980 [2021-11-23 16:47:28,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:47:28,939 INFO L933 BasicCegarLoop]: 1512 mSDtfsCounter, 1457 mSDsluCounter, 3040 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1457 SdHoareTripleChecker+Valid, 4552 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:28,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1457 Valid, 4552 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 49 Unchecked, 0.1s Time] [2021-11-23 16:47:28,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 980 states. [2021-11-23 16:47:28,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 980 to 980. [2021-11-23 16:47:28,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 980 states, 978 states have (on average 1.770961145194274) internal successors, (1732), 979 states have internal predecessors, (1732), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:28,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 980 states to 980 states and 1732 transitions. [2021-11-23 16:47:28,980 INFO L78 Accepts]: Start accepts. Automaton has 980 states and 1732 transitions. Word has length 64 [2021-11-23 16:47:28,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:28,980 INFO L470 AbstractCegarLoop]: Abstraction has 980 states and 1732 transitions. [2021-11-23 16:47:28,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:28,981 INFO L276 IsEmpty]: Start isEmpty. Operand 980 states and 1732 transitions. [2021-11-23 16:47:28,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 16:47:28,982 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:28,982 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:29,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:29,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:29,197 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:29,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:29,198 INFO L85 PathProgramCache]: Analyzing trace with hash -2023735102, now seen corresponding path program 1 times [2021-11-23 16:47:29,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:29,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1764840065] [2021-11-23 16:47:29,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:29,199 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:29,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:29,200 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:29,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 16:47:29,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:29,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:29,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:30,945 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:30,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:31,592 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:31,593 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:31,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1764840065] [2021-11-23 16:47:31,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1764840065] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:31,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [657887824] [2021-11-23 16:47:31,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:31,594 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:31,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:31,597 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:31,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 16:47:31,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:31,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:31,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:33,167 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:33,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:33,657 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:33,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [657887824] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:33,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445747778] [2021-11-23 16:47:33,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:33,657 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:33,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:33,658 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:33,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 16:47:33,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:33,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:47:33,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:35,058 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:35,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:35,509 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:35,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [445747778] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:35,509 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:35,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:47:35,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373994872] [2021-11-23 16:47:35,510 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:35,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:47:35,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:35,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:47:35,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:47:35,512 INFO L87 Difference]: Start difference. First operand 980 states and 1732 transitions. Second operand has 16 states, 16 states have (on average 7.6875) internal successors, (123), 15 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:35,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:35,747 INFO L93 Difference]: Finished difference Result 1162 states and 1985 transitions. [2021-11-23 16:47:35,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 16:47:35,748 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.6875) internal successors, (123), 15 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-23 16:47:35,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:35,755 INFO L225 Difference]: With dead ends: 1162 [2021-11-23 16:47:35,756 INFO L226 Difference]: Without dead ends: 992 [2021-11-23 16:47:35,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-23 16:47:35,758 INFO L933 BasicCegarLoop]: 1500 mSDtfsCounter, 4399 mSDsluCounter, 11981 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4399 SdHoareTripleChecker+Valid, 13481 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:35,758 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4399 Valid, 13481 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 44 Unchecked, 0.1s Time] [2021-11-23 16:47:35,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 992 states. [2021-11-23 16:47:35,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 992 to 992. [2021-11-23 16:47:35,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 992 states, 990 states have (on average 1.7656565656565657) internal successors, (1748), 991 states have internal predecessors, (1748), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:35,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 992 states to 992 states and 1748 transitions. [2021-11-23 16:47:35,799 INFO L78 Accepts]: Start accepts. Automaton has 992 states and 1748 transitions. Word has length 65 [2021-11-23 16:47:35,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:35,800 INFO L470 AbstractCegarLoop]: Abstraction has 992 states and 1748 transitions. [2021-11-23 16:47:35,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.6875) internal successors, (123), 15 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:35,800 INFO L276 IsEmpty]: Start isEmpty. Operand 992 states and 1748 transitions. [2021-11-23 16:47:35,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 16:47:35,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:35,802 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:35,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:36,017 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Ended with exit code 0 [2021-11-23 16:47:36,240 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-23 16:47:36,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:36,417 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:36,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:36,417 INFO L85 PathProgramCache]: Analyzing trace with hash -94088951, now seen corresponding path program 1 times [2021-11-23 16:47:36,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:36,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2006956592] [2021-11-23 16:47:36,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:36,418 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:36,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:36,419 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:36,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 16:47:36,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:36,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:47:36,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:37,050 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:47:37,051 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:37,051 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:37,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2006956592] [2021-11-23 16:47:37,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2006956592] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:37,052 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:37,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:47:37,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46782802] [2021-11-23 16:47:37,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:37,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:47:37,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:37,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:47:37,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:37,054 INFO L87 Difference]: Start difference. First operand 992 states and 1748 transitions. Second operand has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:37,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:37,195 INFO L93 Difference]: Finished difference Result 1228 states and 2070 transitions. [2021-11-23 16:47:37,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:47:37,196 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 16:47:37,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:37,203 INFO L225 Difference]: With dead ends: 1228 [2021-11-23 16:47:37,203 INFO L226 Difference]: Without dead ends: 1058 [2021-11-23 16:47:37,204 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:37,205 INFO L933 BasicCegarLoop]: 1569 mSDtfsCounter, 3060 mSDsluCounter, 1611 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3060 SdHoareTripleChecker+Valid, 3180 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:37,206 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3060 Valid, 3180 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:47:37,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1058 states. [2021-11-23 16:47:37,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1058 to 992. [2021-11-23 16:47:37,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 992 states, 990 states have (on average 1.7595959595959596) internal successors, (1742), 991 states have internal predecessors, (1742), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:37,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 992 states to 992 states and 1742 transitions. [2021-11-23 16:47:37,248 INFO L78 Accepts]: Start accepts. Automaton has 992 states and 1742 transitions. Word has length 66 [2021-11-23 16:47:37,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:37,249 INFO L470 AbstractCegarLoop]: Abstraction has 992 states and 1742 transitions. [2021-11-23 16:47:37,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:37,249 INFO L276 IsEmpty]: Start isEmpty. Operand 992 states and 1742 transitions. [2021-11-23 16:47:37,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 16:47:37,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:37,251 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:37,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:37,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:37,466 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:37,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:37,466 INFO L85 PathProgramCache]: Analyzing trace with hash 1408270156, now seen corresponding path program 1 times [2021-11-23 16:47:37,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:37,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [865682124] [2021-11-23 16:47:37,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:37,467 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:37,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:37,469 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:37,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 16:47:37,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:37,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:47:37,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:38,115 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:47:38,116 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:38,116 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:38,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [865682124] [2021-11-23 16:47:38,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [865682124] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:38,116 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:38,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:47:38,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358643711] [2021-11-23 16:47:38,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:38,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:47:38,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:38,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:47:38,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:38,118 INFO L87 Difference]: Start difference. First operand 992 states and 1742 transitions. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:38,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:38,244 INFO L93 Difference]: Finished difference Result 1172 states and 1990 transitions. [2021-11-23 16:47:38,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:47:38,245 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 16:47:38,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:38,253 INFO L225 Difference]: With dead ends: 1172 [2021-11-23 16:47:38,254 INFO L226 Difference]: Without dead ends: 1114 [2021-11-23 16:47:38,255 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:38,256 INFO L933 BasicCegarLoop]: 1575 mSDtfsCounter, 1601 mSDsluCounter, 1645 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1601 SdHoareTripleChecker+Valid, 3220 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:38,256 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1601 Valid, 3220 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:47:38,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1114 states. [2021-11-23 16:47:38,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1114 to 1052. [2021-11-23 16:47:38,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1052 states, 1050 states have (on average 1.7333333333333334) internal successors, (1820), 1051 states have internal predecessors, (1820), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:38,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1052 states to 1052 states and 1820 transitions. [2021-11-23 16:47:38,300 INFO L78 Accepts]: Start accepts. Automaton has 1052 states and 1820 transitions. Word has length 66 [2021-11-23 16:47:38,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:38,300 INFO L470 AbstractCegarLoop]: Abstraction has 1052 states and 1820 transitions. [2021-11-23 16:47:38,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:38,301 INFO L276 IsEmpty]: Start isEmpty. Operand 1052 states and 1820 transitions. [2021-11-23 16:47:38,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 16:47:38,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:38,302 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:38,317 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:38,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:38,517 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:38,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:38,518 INFO L85 PathProgramCache]: Analyzing trace with hash 52806377, now seen corresponding path program 1 times [2021-11-23 16:47:38,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:38,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [271461769] [2021-11-23 16:47:38,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:38,518 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:38,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:38,519 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:38,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 16:47:38,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:38,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:47:38,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:39,161 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:47:39,161 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:47:39,161 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:39,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [271461769] [2021-11-23 16:47:39,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [271461769] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:47:39,161 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:47:39,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:47:39,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104854684] [2021-11-23 16:47:39,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:47:39,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:47:39,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:39,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:47:39,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:39,166 INFO L87 Difference]: Start difference. First operand 1052 states and 1820 transitions. Second operand has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:39,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:39,302 INFO L93 Difference]: Finished difference Result 1232 states and 2068 transitions. [2021-11-23 16:47:39,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:47:39,303 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-23 16:47:39,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:39,312 INFO L225 Difference]: With dead ends: 1232 [2021-11-23 16:47:39,312 INFO L226 Difference]: Without dead ends: 1174 [2021-11-23 16:47:39,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:47:39,314 INFO L933 BasicCegarLoop]: 1572 mSDtfsCounter, 3055 mSDsluCounter, 1609 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3055 SdHoareTripleChecker+Valid, 3181 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:39,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3055 Valid, 3181 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:47:39,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1174 states. [2021-11-23 16:47:39,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1174 to 1112. [2021-11-23 16:47:39,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1112 states, 1110 states have (on average 1.70990990990991) internal successors, (1898), 1111 states have internal predecessors, (1898), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:39,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1112 states to 1112 states and 1898 transitions. [2021-11-23 16:47:39,368 INFO L78 Accepts]: Start accepts. Automaton has 1112 states and 1898 transitions. Word has length 66 [2021-11-23 16:47:39,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:39,368 INFO L470 AbstractCegarLoop]: Abstraction has 1112 states and 1898 transitions. [2021-11-23 16:47:39,369 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:39,369 INFO L276 IsEmpty]: Start isEmpty. Operand 1112 states and 1898 transitions. [2021-11-23 16:47:39,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 16:47:39,370 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:39,370 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:39,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 16:47:39,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:39,585 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:39,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:39,586 INFO L85 PathProgramCache]: Analyzing trace with hash -791645332, now seen corresponding path program 1 times [2021-11-23 16:47:39,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:39,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [671262623] [2021-11-23 16:47:39,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:39,587 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:39,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:39,588 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:39,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 16:47:39,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:39,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:47:39,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:43,149 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:43,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:45,680 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:45,681 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:47:45,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [671262623] [2021-11-23 16:47:45,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [671262623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:45,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1244826267] [2021-11-23 16:47:45,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:45,681 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:47:45,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:47:45,682 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:47:45,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-23 16:47:45,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:45,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:47:45,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:48,695 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:48,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:49,616 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:49,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1244826267] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:49,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433932606] [2021-11-23 16:47:49,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:49,617 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:47:49,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:47:49,618 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:47:49,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-23 16:47:49,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:49,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:47:49,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:53,690 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:53,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:47:55,064 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:55,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [433932606] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:47:55,065 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:47:55,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 22, 20, 18, 17] total 56 [2021-11-23 16:47:55,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954001149] [2021-11-23 16:47:55,065 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:47:55,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-23 16:47:55,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:47:55,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-23 16:47:55,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=2714, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 16:47:55,070 INFO L87 Difference]: Start difference. First operand 1112 states and 1898 transitions. Second operand has 56 states, 56 states have (on average 3.392857142857143) internal successors, (190), 56 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:56,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:47:56,095 INFO L93 Difference]: Finished difference Result 1359 states and 2215 transitions. [2021-11-23 16:47:56,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 16:47:56,096 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.392857142857143) internal successors, (190), 56 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-23 16:47:56,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:47:56,102 INFO L225 Difference]: With dead ends: 1359 [2021-11-23 16:47:56,102 INFO L226 Difference]: Without dead ends: 1241 [2021-11-23 16:47:56,104 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 343 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1315 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=466, Invalid=3074, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 16:47:56,105 INFO L933 BasicCegarLoop]: 1520 mSDtfsCounter, 5919 mSDsluCounter, 30104 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5919 SdHoareTripleChecker+Valid, 31624 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 257 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:47:56,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5919 Valid, 31624 Invalid, 423 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 152 Invalid, 0 Unknown, 257 Unchecked, 0.3s Time] [2021-11-23 16:47:56,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1241 states. [2021-11-23 16:47:56,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1241 to 1118. [2021-11-23 16:47:56,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1118 states, 1116 states have (on average 1.706989247311828) internal successors, (1905), 1117 states have internal predecessors, (1905), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:56,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1118 states to 1118 states and 1905 transitions. [2021-11-23 16:47:56,155 INFO L78 Accepts]: Start accepts. Automaton has 1118 states and 1905 transitions. Word has length 67 [2021-11-23 16:47:56,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:47:56,155 INFO L470 AbstractCegarLoop]: Abstraction has 1118 states and 1905 transitions. [2021-11-23 16:47:56,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.392857142857143) internal successors, (190), 56 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:47:56,156 INFO L276 IsEmpty]: Start isEmpty. Operand 1118 states and 1905 transitions. [2021-11-23 16:47:56,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 16:47:56,157 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:47:56,157 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:47:56,183 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-11-23 16:47:56,362 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Ended with exit code 0 [2021-11-23 16:47:56,572 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Ended with exit code 0 [2021-11-23 16:47:56,762 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:47:56,763 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:47:56,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:47:56,763 INFO L85 PathProgramCache]: Analyzing trace with hash 138650479, now seen corresponding path program 1 times [2021-11-23 16:47:56,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:47:56,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2036748816] [2021-11-23 16:47:56,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:47:56,764 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:47:56,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:47:56,766 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:47:56,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 16:47:56,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:47:56,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:47:56,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:47:59,743 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:47:59,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:01,423 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:01,423 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:01,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2036748816] [2021-11-23 16:48:01,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2036748816] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:01,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1255234950] [2021-11-23 16:48:01,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:01,424 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:01,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:01,425 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:01,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-23 16:48:01,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:01,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:48:01,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:04,091 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:04,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:04,771 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:04,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1255234950] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:04,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1642090084] [2021-11-23 16:48:04,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:04,771 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:04,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:04,772 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:04,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-23 16:48:04,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:04,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:48:04,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:08,308 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:08,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:09,723 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:09,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1642090084] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:09,723 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:09,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 20, 18, 18, 18] total 55 [2021-11-23 16:48:09,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427028317] [2021-11-23 16:48:09,724 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:09,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 16:48:09,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:09,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 16:48:09,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=2600, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 16:48:09,727 INFO L87 Difference]: Start difference. First operand 1118 states and 1905 transitions. Second operand has 55 states, 55 states have (on average 3.4909090909090907) internal successors, (192), 55 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:10,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:10,549 INFO L93 Difference]: Finished difference Result 1349 states and 2204 transitions. [2021-11-23 16:48:10,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 16:48:10,552 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.4909090909090907) internal successors, (192), 55 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-23 16:48:10,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:10,556 INFO L225 Difference]: With dead ends: 1349 [2021-11-23 16:48:10,556 INFO L226 Difference]: Without dead ends: 1221 [2021-11-23 16:48:10,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1398 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=421, Invalid=2771, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 16:48:10,560 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 5943 mSDsluCounter, 30327 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5943 SdHoareTripleChecker+Valid, 31848 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 296 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:10,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5943 Valid, 31848 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 245 Invalid, 0 Unknown, 296 Unchecked, 0.4s Time] [2021-11-23 16:48:10,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1221 states. [2021-11-23 16:48:10,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1221 to 1104. [2021-11-23 16:48:10,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1104 states, 1102 states have (on average 1.7132486388384756) internal successors, (1888), 1103 states have internal predecessors, (1888), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:10,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1104 states to 1104 states and 1888 transitions. [2021-11-23 16:48:10,612 INFO L78 Accepts]: Start accepts. Automaton has 1104 states and 1888 transitions. Word has length 67 [2021-11-23 16:48:10,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:10,612 INFO L470 AbstractCegarLoop]: Abstraction has 1104 states and 1888 transitions. [2021-11-23 16:48:10,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.4909090909090907) internal successors, (192), 55 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:10,613 INFO L276 IsEmpty]: Start isEmpty. Operand 1104 states and 1888 transitions. [2021-11-23 16:48:10,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 16:48:10,614 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:10,614 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:10,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:10,826 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-23 16:48:11,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:11,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:11,217 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:11,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:11,217 INFO L85 PathProgramCache]: Analyzing trace with hash 531431905, now seen corresponding path program 1 times [2021-11-23 16:48:11,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:11,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1686581381] [2021-11-23 16:48:11,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:11,218 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:11,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:11,219 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:11,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 16:48:11,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:11,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:48:11,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:11,535 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:48:11,535 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:48:11,536 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:11,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1686581381] [2021-11-23 16:48:11,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1686581381] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:48:11,536 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:48:11,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:48:11,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992709587] [2021-11-23 16:48:11,537 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:48:11,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:48:11,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:11,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:48:11,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:48:11,538 INFO L87 Difference]: Start difference. First operand 1104 states and 1888 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:53,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:53,830 INFO L93 Difference]: Finished difference Result 2608 states and 4761 transitions. [2021-11-23 16:48:53,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:48:53,831 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-23 16:48:53,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:53,837 INFO L225 Difference]: With dead ends: 2608 [2021-11-23 16:48:53,837 INFO L226 Difference]: Without dead ends: 1855 [2021-11-23 16:48:53,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:48:53,840 INFO L933 BasicCegarLoop]: 618 mSDtfsCounter, 807 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2197 mSolverCounterSat, 664 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 807 SdHoareTripleChecker+Valid, 625 SdHoareTripleChecker+Invalid, 2861 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 664 IncrementalHoareTripleChecker+Valid, 2197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 42.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:53,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [807 Valid, 625 Invalid, 2861 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [664 Valid, 2197 Invalid, 0 Unknown, 0 Unchecked, 42.2s Time] [2021-11-23 16:48:53,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1855 states. [2021-11-23 16:48:53,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1855 to 1855. [2021-11-23 16:48:53,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1855 states, 1853 states have (on average 1.5083648138154344) internal successors, (2795), 1854 states have internal predecessors, (2795), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:53,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1855 states to 1855 states and 2795 transitions. [2021-11-23 16:48:53,912 INFO L78 Accepts]: Start accepts. Automaton has 1855 states and 2795 transitions. Word has length 67 [2021-11-23 16:48:53,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:53,913 INFO L470 AbstractCegarLoop]: Abstraction has 1855 states and 2795 transitions. [2021-11-23 16:48:53,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:53,913 INFO L276 IsEmpty]: Start isEmpty. Operand 1855 states and 2795 transitions. [2021-11-23 16:48:53,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 16:48:53,914 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:53,915 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:53,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:54,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:48:54,130 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:54,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:54,130 INFO L85 PathProgramCache]: Analyzing trace with hash -14785480, now seen corresponding path program 1 times [2021-11-23 16:48:54,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:54,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [386060885] [2021-11-23 16:48:54,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:54,131 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:54,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:54,132 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:54,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 16:48:54,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:54,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:48:54,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:54,563 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:48:54,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:54,830 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:48:54,830 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:48:54,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [386060885] [2021-11-23 16:48:54,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [386060885] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:54,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [779484355] [2021-11-23 16:48:54,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:54,831 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:54,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:48:54,832 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:48:54,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 16:48:54,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:54,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:48:54,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:55,308 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:48:55,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:55,547 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:48:55,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [779484355] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:55,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178229622] [2021-11-23 16:48:55,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:55,548 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:48:55,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:48:55,549 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:48:55,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 16:48:55,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:55,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:48:55,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:48:55,998 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:48:55,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:48:56,238 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:48:56,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178229622] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:48:56,239 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:48:56,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 16:48:56,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146535696] [2021-11-23 16:48:56,239 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:48:56,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:48:56,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:48:56,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:48:56,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:48:56,241 INFO L87 Difference]: Start difference. First operand 1855 states and 2795 transitions. Second operand has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:56,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:48:56,367 INFO L93 Difference]: Finished difference Result 2611 states and 3781 transitions. [2021-11-23 16:48:56,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:48:56,368 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-23 16:48:56,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:48:56,374 INFO L225 Difference]: With dead ends: 2611 [2021-11-23 16:48:56,374 INFO L226 Difference]: Without dead ends: 2329 [2021-11-23 16:48:56,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 395 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:48:56,377 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 1587 mSDsluCounter, 1687 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1587 SdHoareTripleChecker+Valid, 3223 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:48:56,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1587 Valid, 3223 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 22 Invalid, 0 Unknown, 16 Unchecked, 0.1s Time] [2021-11-23 16:48:56,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2329 states. [2021-11-23 16:48:56,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2329 to 2261. [2021-11-23 16:48:56,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2261 states, 2259 states have (on average 1.467020805666224) internal successors, (3314), 2260 states have internal predecessors, (3314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:56,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2261 states to 2261 states and 3314 transitions. [2021-11-23 16:48:56,471 INFO L78 Accepts]: Start accepts. Automaton has 2261 states and 3314 transitions. Word has length 68 [2021-11-23 16:48:56,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:48:56,471 INFO L470 AbstractCegarLoop]: Abstraction has 2261 states and 3314 transitions. [2021-11-23 16:48:56,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:48:56,472 INFO L276 IsEmpty]: Start isEmpty. Operand 2261 states and 3314 transitions. [2021-11-23 16:48:56,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 16:48:56,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:48:56,473 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:48:56,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:56,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:56,895 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-23 16:48:57,089 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:48:57,090 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:48:57,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:48:57,090 INFO L85 PathProgramCache]: Analyzing trace with hash -1574375839, now seen corresponding path program 1 times [2021-11-23 16:48:57,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:48:57,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2010359501] [2021-11-23 16:48:57,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:48:57,091 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:48:57,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:48:57,093 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:48:57,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 16:48:57,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:48:57,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 16:48:57,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:02,255 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:02,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:05,726 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:05,727 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:05,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2010359501] [2021-11-23 16:49:05,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2010359501] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:05,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [162879905] [2021-11-23 16:49:05,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:05,727 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:05,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:05,728 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:05,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-23 16:49:05,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:05,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:49:05,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:08,988 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:08,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:10,024 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:10,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [162879905] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:10,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135931720] [2021-11-23 16:49:10,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:10,025 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:10,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:10,026 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:10,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 16:49:10,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:10,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:49:10,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:16,654 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:16,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:18,669 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:18,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135931720] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:18,670 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:18,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 11, 9, 23, 20] total 68 [2021-11-23 16:49:18,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724481676] [2021-11-23 16:49:18,670 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:18,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 16:49:18,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:18,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 16:49:18,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=555, Invalid=4001, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 16:49:18,674 INFO L87 Difference]: Start difference. First operand 2261 states and 3314 transitions. Second operand has 68 states, 68 states have (on average 3.8529411764705883) internal successors, (262), 68 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:20,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:20,079 INFO L93 Difference]: Finished difference Result 2516 states and 3643 transitions. [2021-11-23 16:49:20,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 16:49:20,080 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.8529411764705883) internal successors, (262), 68 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-23 16:49:20,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:20,084 INFO L225 Difference]: With dead ends: 2516 [2021-11-23 16:49:20,084 INFO L226 Difference]: Without dead ends: 2288 [2021-11-23 16:49:20,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 336 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2133 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=615, Invalid=4215, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 16:49:20,088 INFO L933 BasicCegarLoop]: 1494 mSDtfsCounter, 18864 mSDsluCounter, 28418 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18864 SdHoareTripleChecker+Valid, 29912 SdHoareTripleChecker+Invalid, 434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 151 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:20,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18864 Valid, 29912 Invalid, 434 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [20 Valid, 263 Invalid, 0 Unknown, 151 Unchecked, 0.5s Time] [2021-11-23 16:49:20,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2288 states. [2021-11-23 16:49:20,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2288 to 2267. [2021-11-23 16:49:20,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2267 states, 2265 states have (on average 1.466225165562914) internal successors, (3321), 2266 states have internal predecessors, (3321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:20,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2267 states to 2267 states and 3321 transitions. [2021-11-23 16:49:20,217 INFO L78 Accepts]: Start accepts. Automaton has 2267 states and 3321 transitions. Word has length 68 [2021-11-23 16:49:20,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:20,217 INFO L470 AbstractCegarLoop]: Abstraction has 2267 states and 3321 transitions. [2021-11-23 16:49:20,217 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.8529411764705883) internal successors, (262), 68 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:20,218 INFO L276 IsEmpty]: Start isEmpty. Operand 2267 states and 3321 transitions. [2021-11-23 16:49:20,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 16:49:20,219 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:20,219 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:20,237 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Ended with exit code 0 [2021-11-23 16:49:20,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:20,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:20,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:49:20,822 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:20,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:20,823 INFO L85 PathProgramCache]: Analyzing trace with hash 1310661252, now seen corresponding path program 1 times [2021-11-23 16:49:20,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:20,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1504429358] [2021-11-23 16:49:20,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:20,823 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:20,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:20,824 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:20,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 16:49:20,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:20,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:49:20,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:24,722 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:24,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:27,503 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:27,504 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:27,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1504429358] [2021-11-23 16:49:27,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1504429358] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:27,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [742666329] [2021-11-23 16:49:27,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:27,504 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:27,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:27,505 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:27,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-23 16:49:27,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:27,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:49:27,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:32,512 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:32,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:35,509 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:35,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [742666329] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:35,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950305401] [2021-11-23 16:49:35,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:35,510 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:35,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:35,516 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:35,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-23 16:49:35,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:35,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:49:35,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:39,498 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:39,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:41,073 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:41,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [950305401] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:41,074 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:41,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 22, 20, 16, 15] total 87 [2021-11-23 16:49:41,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217420189] [2021-11-23 16:49:41,074 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:41,075 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-23 16:49:41,075 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:41,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-23 16:49:41,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=848, Invalid=6634, Unknown=0, NotChecked=0, Total=7482 [2021-11-23 16:49:41,078 INFO L87 Difference]: Start difference. First operand 2267 states and 3321 transitions. Second operand has 87 states, 87 states have (on average 3.3448275862068964) internal successors, (291), 87 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:43,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:43,172 INFO L93 Difference]: Finished difference Result 2840 states and 4062 transitions. [2021-11-23 16:49:43,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 16:49:43,172 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 3.3448275862068964) internal successors, (291), 87 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-23 16:49:43,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:43,177 INFO L225 Difference]: With dead ends: 2840 [2021-11-23 16:49:43,177 INFO L226 Difference]: Without dead ends: 2149 [2021-11-23 16:49:43,181 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4127 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=1022, Invalid=7350, Unknown=0, NotChecked=0, Total=8372 [2021-11-23 16:49:43,182 INFO L933 BasicCegarLoop]: 1506 mSDtfsCounter, 13192 mSDsluCounter, 34726 mSDsCounter, 0 mSdLazyCounter, 543 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13192 SdHoareTripleChecker+Valid, 36232 SdHoareTripleChecker+Invalid, 1067 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 500 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:43,182 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13192 Valid, 36232 Invalid, 1067 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [24 Valid, 543 Invalid, 0 Unknown, 500 Unchecked, 0.9s Time] [2021-11-23 16:49:43,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2149 states. [2021-11-23 16:49:43,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2149 to 2137. [2021-11-23 16:49:43,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2137 states, 2135 states have (on average 1.4744730679156908) internal successors, (3148), 2136 states have internal predecessors, (3148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:43,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2137 states to 2137 states and 3148 transitions. [2021-11-23 16:49:43,267 INFO L78 Accepts]: Start accepts. Automaton has 2137 states and 3148 transitions. Word has length 68 [2021-11-23 16:49:43,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:43,267 INFO L470 AbstractCegarLoop]: Abstraction has 2137 states and 3148 transitions. [2021-11-23 16:49:43,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 3.3448275862068964) internal successors, (291), 87 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:43,268 INFO L276 IsEmpty]: Start isEmpty. Operand 2137 states and 3148 transitions. [2021-11-23 16:49:43,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 16:49:43,269 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:43,269 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:43,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:43,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:43,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:43,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:43,871 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:43,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:43,872 INFO L85 PathProgramCache]: Analyzing trace with hash 1846619806, now seen corresponding path program 1 times [2021-11-23 16:49:43,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:43,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2012706115] [2021-11-23 16:49:43,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:43,872 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:43,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:43,875 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:43,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-23 16:49:43,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:43,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:49:43,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:44,269 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:49:44,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:44,514 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:49:44,514 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:44,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2012706115] [2021-11-23 16:49:44,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2012706115] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:44,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [619677524] [2021-11-23 16:49:44,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:44,514 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:44,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:44,515 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:44,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-23 16:49:44,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:44,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:49:44,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:44,688 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:49:44,688 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:49:44,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [619677524] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:49:44,688 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:49:44,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 16:49:44,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11633103] [2021-11-23 16:49:44,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:49:44,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:49:44,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:44,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:49:44,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:49:44,690 INFO L87 Difference]: Start difference. First operand 2137 states and 3148 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:44,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:44,754 INFO L93 Difference]: Finished difference Result 2660 states and 3822 transitions. [2021-11-23 16:49:44,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:49:44,754 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-23 16:49:44,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:44,758 INFO L225 Difference]: With dead ends: 2660 [2021-11-23 16:49:44,758 INFO L226 Difference]: Without dead ends: 2158 [2021-11-23 16:49:44,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:49:44,760 INFO L933 BasicCegarLoop]: 1515 mSDtfsCounter, 1484 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1484 SdHoareTripleChecker+Valid, 1564 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:44,760 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1484 Valid, 1564 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:49:44,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2158 states. [2021-11-23 16:49:44,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2158 to 2107. [2021-11-23 16:49:44,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2107 states, 2105 states have (on average 1.4764845605700712) internal successors, (3108), 2106 states have internal predecessors, (3108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:44,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2107 states to 2107 states and 3108 transitions. [2021-11-23 16:49:44,853 INFO L78 Accepts]: Start accepts. Automaton has 2107 states and 3108 transitions. Word has length 69 [2021-11-23 16:49:44,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:44,854 INFO L470 AbstractCegarLoop]: Abstraction has 2107 states and 3108 transitions. [2021-11-23 16:49:44,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:44,854 INFO L276 IsEmpty]: Start isEmpty. Operand 2107 states and 3108 transitions. [2021-11-23 16:49:44,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 16:49:44,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:44,855 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:44,874 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Ended with exit code 0 [2021-11-23 16:49:45,071 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Ended with exit code 0 [2021-11-23 16:49:45,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:45,270 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:45,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:45,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1362739138, now seen corresponding path program 1 times [2021-11-23 16:49:45,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:45,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1922375943] [2021-11-23 16:49:45,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:45,271 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:45,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:45,272 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:45,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 16:49:45,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:45,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:49:45,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:47,178 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:47,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:47,661 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:47,662 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:47,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1922375943] [2021-11-23 16:49:47,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1922375943] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:47,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [623368202] [2021-11-23 16:49:47,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:47,662 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:47,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:47,663 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:47,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 16:49:47,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:47,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:49:47,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:49,452 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:49,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:49,720 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:49,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [623368202] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:49,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070555339] [2021-11-23 16:49:49,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:49,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:49,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:49,722 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:49,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 16:49:49,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:49,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:49:49,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:51,340 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:51,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:51,617 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:51,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1070555339] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:51,618 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:49:51,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 18 [2021-11-23 16:49:51,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001832690] [2021-11-23 16:49:51,619 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:49:51,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 16:49:51,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:49:51,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 16:49:51,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 16:49:51,621 INFO L87 Difference]: Start difference. First operand 2107 states and 3108 transitions. Second operand has 18 states, 18 states have (on average 6.833333333333333) internal successors, (123), 18 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:51,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:49:51,820 INFO L93 Difference]: Finished difference Result 2278 states and 3332 transitions. [2021-11-23 16:49:51,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:49:51,820 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 6.833333333333333) internal successors, (123), 18 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-23 16:49:51,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:49:51,824 INFO L225 Difference]: With dead ends: 2278 [2021-11-23 16:49:51,825 INFO L226 Difference]: Without dead ends: 2055 [2021-11-23 16:49:51,826 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 392 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-23 16:49:51,827 INFO L933 BasicCegarLoop]: 1507 mSDtfsCounter, 54 mSDsluCounter, 16455 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 17962 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 58 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:49:51,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 17962 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 58 Unchecked, 0.1s Time] [2021-11-23 16:49:51,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2055 states. [2021-11-23 16:49:51,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2055 to 2049. [2021-11-23 16:49:51,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2049 states, 2047 states have (on average 1.4807034684904739) internal successors, (3031), 2048 states have internal predecessors, (3031), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:51,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2049 states to 2049 states and 3031 transitions. [2021-11-23 16:49:51,903 INFO L78 Accepts]: Start accepts. Automaton has 2049 states and 3031 transitions. Word has length 69 [2021-11-23 16:49:51,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:49:51,904 INFO L470 AbstractCegarLoop]: Abstraction has 2049 states and 3031 transitions. [2021-11-23 16:49:51,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 6.833333333333333) internal successors, (123), 18 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:49:51,904 INFO L276 IsEmpty]: Start isEmpty. Operand 2049 states and 3031 transitions. [2021-11-23 16:49:51,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 16:49:51,906 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:49:51,906 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:49:51,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:52,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:52,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 16:49:52,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:52,509 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:49:52,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:49:52,510 INFO L85 PathProgramCache]: Analyzing trace with hash 1940957519, now seen corresponding path program 1 times [2021-11-23 16:49:52,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:49:52,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [537860717] [2021-11-23 16:49:52,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:52,510 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:49:52,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:49:52,512 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:49:52,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 16:49:52,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:52,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:49:52,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:55,333 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:55,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:56,314 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:56,314 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:49:56,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [537860717] [2021-11-23 16:49:56,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [537860717] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:56,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [575519847] [2021-11-23 16:49:56,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:56,315 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:56,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:49:56,316 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:49:56,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 16:49:56,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:56,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:49:56,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:49:58,773 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:58,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:49:59,347 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:49:59,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [575519847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:49:59,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1665770213] [2021-11-23 16:49:59,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:49:59,347 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:49:59,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:59,348 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:49:59,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 16:49:59,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:49:59,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:49:59,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:01,335 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:50:01,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:02,409 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:50:02,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1665770213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:02,410 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:50:02,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:50:02,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445809001] [2021-11-23 16:50:02,410 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:50:02,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:50:02,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:02,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:50:02,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:50:02,413 INFO L87 Difference]: Start difference. First operand 2049 states and 3031 transitions. Second operand has 34 states, 34 states have (on average 9.970588235294118) internal successors, (339), 33 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:03,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:03,339 INFO L93 Difference]: Finished difference Result 2498 states and 3606 transitions. [2021-11-23 16:50:03,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:50:03,339 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 9.970588235294118) internal successors, (339), 33 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-23 16:50:03,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:03,343 INFO L225 Difference]: With dead ends: 2498 [2021-11-23 16:50:03,343 INFO L226 Difference]: Without dead ends: 2083 [2021-11-23 16:50:03,345 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 632 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=253, Invalid=1639, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:50:03,346 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 11677 mSDsluCounter, 28539 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11677 SdHoareTripleChecker+Valid, 30053 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:03,347 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11677 Valid, 30053 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 48 Invalid, 0 Unknown, 114 Unchecked, 0.1s Time] [2021-11-23 16:50:03,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2021-11-23 16:50:03,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 2083. [2021-11-23 16:50:03,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2083 states, 2081 states have (on average 1.474291206150889) internal successors, (3068), 2082 states have internal predecessors, (3068), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:03,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2083 states to 2083 states and 3068 transitions. [2021-11-23 16:50:03,424 INFO L78 Accepts]: Start accepts. Automaton has 2083 states and 3068 transitions. Word has length 111 [2021-11-23 16:50:03,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:03,424 INFO L470 AbstractCegarLoop]: Abstraction has 2083 states and 3068 transitions. [2021-11-23 16:50:03,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 9.970588235294118) internal successors, (339), 33 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:03,425 INFO L276 IsEmpty]: Start isEmpty. Operand 2083 states and 3068 transitions. [2021-11-23 16:50:03,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 16:50:03,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:03,427 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:03,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:03,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:03,866 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2021-11-23 16:50:04,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:04,042 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:04,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:04,042 INFO L85 PathProgramCache]: Analyzing trace with hash -721276639, now seen corresponding path program 1 times [2021-11-23 16:50:04,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:04,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1310262559] [2021-11-23 16:50:04,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:04,043 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:04,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:04,044 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:04,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 16:50:04,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:04,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:50:04,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:06,895 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:06,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:07,971 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:07,971 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:07,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1310262559] [2021-11-23 16:50:07,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1310262559] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:07,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1660014290] [2021-11-23 16:50:07,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:07,972 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:07,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:50:07,972 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:50:07,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 16:50:08,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:08,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:50:08,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:10,449 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:10,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:11,233 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:11,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1660014290] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:11,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456509952] [2021-11-23 16:50:11,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:11,234 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:11,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:11,235 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:50:11,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 16:50:11,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:11,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:50:11,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:13,790 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 65 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:50:13,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:14,636 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 25 proven. 65 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:50:14,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456509952] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:14,636 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:50:14,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:50:14,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91344023] [2021-11-23 16:50:14,637 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:50:14,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:50:14,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:14,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:50:14,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:50:14,639 INFO L87 Difference]: Start difference. First operand 2083 states and 3068 transitions. Second operand has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:15,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:15,674 INFO L93 Difference]: Finished difference Result 2576 states and 3692 transitions. [2021-11-23 16:50:15,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 16:50:15,675 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-23 16:50:15,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:15,680 INFO L225 Difference]: With dead ends: 2576 [2021-11-23 16:50:15,681 INFO L226 Difference]: Without dead ends: 2167 [2021-11-23 16:50:15,683 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 632 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=271, Invalid=1709, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 16:50:15,684 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 10213 mSDsluCounter, 24376 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10213 SdHoareTripleChecker+Valid, 25894 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 164 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:15,685 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10213 Valid, 25894 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 48 Invalid, 0 Unknown, 164 Unchecked, 0.1s Time] [2021-11-23 16:50:15,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2167 states. [2021-11-23 16:50:15,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2167 to 2167. [2021-11-23 16:50:15,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2167 states, 2165 states have (on average 1.4605080831408777) internal successors, (3162), 2166 states have internal predecessors, (3162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:15,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2167 states to 2167 states and 3162 transitions. [2021-11-23 16:50:15,802 INFO L78 Accepts]: Start accepts. Automaton has 2167 states and 3162 transitions. Word has length 111 [2021-11-23 16:50:15,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:15,803 INFO L470 AbstractCegarLoop]: Abstraction has 2167 states and 3162 transitions. [2021-11-23 16:50:15,803 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:15,803 INFO L276 IsEmpty]: Start isEmpty. Operand 2167 states and 3162 transitions. [2021-11-23 16:50:15,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 16:50:15,805 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:15,805 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:15,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:16,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:16,232 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2021-11-23 16:50:16,408 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:16,408 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:16,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:16,409 INFO L85 PathProgramCache]: Analyzing trace with hash 1804907841, now seen corresponding path program 1 times [2021-11-23 16:50:16,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:16,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2004419825] [2021-11-23 16:50:16,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:16,410 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:16,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:16,411 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:16,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 16:50:16,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:16,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:50:16,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:19,683 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:19,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:20,587 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:20,587 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:20,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2004419825] [2021-11-23 16:50:20,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2004419825] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:20,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [601460899] [2021-11-23 16:50:20,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:20,588 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:20,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:50:20,588 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:50:20,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 16:50:20,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:20,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:50:20,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:23,500 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:23,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:23,982 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:23,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [601460899] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:23,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058674832] [2021-11-23 16:50:23,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:23,983 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:23,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:23,988 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:50:23,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 16:50:24,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:24,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:50:24,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:26,468 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 72 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:50:26,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:27,422 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 72 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:50:27,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058674832] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:27,422 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:50:27,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:50:27,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440372924] [2021-11-23 16:50:27,423 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:50:27,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:50:27,425 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:27,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:50:27,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:50:27,426 INFO L87 Difference]: Start difference. First operand 2167 states and 3162 transitions. Second operand has 34 states, 34 states have (on average 10.705882352941176) internal successors, (364), 33 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:28,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:28,282 INFO L93 Difference]: Finished difference Result 2733 states and 3869 transitions. [2021-11-23 16:50:28,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:50:28,282 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 10.705882352941176) internal successors, (364), 33 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-23 16:50:28,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:28,287 INFO L225 Difference]: With dead ends: 2733 [2021-11-23 16:50:28,287 INFO L226 Difference]: Without dead ends: 2336 [2021-11-23 16:50:28,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 673 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 442 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=241, Invalid=1651, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:50:28,291 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 5855 mSDsluCounter, 25666 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5855 SdHoareTripleChecker+Valid, 27187 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 128 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:28,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5855 Valid, 27187 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 48 Invalid, 0 Unknown, 128 Unchecked, 0.1s Time] [2021-11-23 16:50:28,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2336 states. [2021-11-23 16:50:28,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2336 to 2336. [2021-11-23 16:50:28,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2336 states, 2334 states have (on average 1.437446443873179) internal successors, (3355), 2335 states have internal predecessors, (3355), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:28,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2336 states to 2336 states and 3355 transitions. [2021-11-23 16:50:28,403 INFO L78 Accepts]: Start accepts. Automaton has 2336 states and 3355 transitions. Word has length 111 [2021-11-23 16:50:28,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:28,404 INFO L470 AbstractCegarLoop]: Abstraction has 2336 states and 3355 transitions. [2021-11-23 16:50:28,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 10.705882352941176) internal successors, (364), 33 states have internal predecessors, (364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:28,405 INFO L276 IsEmpty]: Start isEmpty. Operand 2336 states and 3355 transitions. [2021-11-23 16:50:28,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 16:50:28,407 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:28,407 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:28,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:28,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:28,834 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-23 16:50:29,009 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:29,010 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:29,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:29,010 INFO L85 PathProgramCache]: Analyzing trace with hash 1868570961, now seen corresponding path program 1 times [2021-11-23 16:50:29,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:29,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1348503927] [2021-11-23 16:50:29,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:29,011 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:29,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:29,013 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:29,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 16:50:29,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:29,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:50:29,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:31,265 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:50:31,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:32,193 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:50:32,193 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:32,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1348503927] [2021-11-23 16:50:32,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1348503927] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:32,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1626364256] [2021-11-23 16:50:32,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:32,194 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:32,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:50:32,195 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:50:32,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 16:50:32,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:32,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:50:32,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:36,065 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:36,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:37,304 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:37,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1626364256] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:37,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859134003] [2021-11-23 16:50:37,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:37,306 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:37,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:37,308 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:50:37,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 16:50:37,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:37,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:50:37,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:40,025 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:50:40,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:40,934 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 64 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:50:40,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859134003] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:40,934 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:50:40,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 16:50:40,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100649335] [2021-11-23 16:50:40,935 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:50:40,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 16:50:40,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:40,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 16:50:40,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 16:50:40,939 INFO L87 Difference]: Start difference. First operand 2336 states and 3355 transitions. Second operand has 48 states, 48 states have (on average 10.395833333333334) internal successors, (499), 47 states have internal predecessors, (499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:43,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:43,515 INFO L93 Difference]: Finished difference Result 2898 states and 4071 transitions. [2021-11-23 16:50:43,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 16:50:43,516 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 10.395833333333334) internal successors, (499), 47 states have internal predecessors, (499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-23 16:50:43,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:43,519 INFO L225 Difference]: With dead ends: 2898 [2021-11-23 16:50:43,519 INFO L226 Difference]: Without dead ends: 2446 [2021-11-23 16:50:43,522 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 620 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1121 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=446, Invalid=4110, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 16:50:43,523 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 11834 mSDsluCounter, 36300 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11834 SdHoareTripleChecker+Valid, 37818 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 157 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:43,523 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11834 Valid, 37818 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 76 Invalid, 0 Unknown, 157 Unchecked, 0.1s Time] [2021-11-23 16:50:43,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2446 states. [2021-11-23 16:50:43,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2446 to 2442. [2021-11-23 16:50:43,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2442 states, 2440 states have (on average 1.4258196721311476) internal successors, (3479), 2441 states have internal predecessors, (3479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:43,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2442 states to 2442 states and 3479 transitions. [2021-11-23 16:50:43,600 INFO L78 Accepts]: Start accepts. Automaton has 2442 states and 3479 transitions. Word has length 111 [2021-11-23 16:50:43,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:43,600 INFO L470 AbstractCegarLoop]: Abstraction has 2442 states and 3479 transitions. [2021-11-23 16:50:43,600 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 10.395833333333334) internal successors, (499), 47 states have internal predecessors, (499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:43,600 INFO L276 IsEmpty]: Start isEmpty. Operand 2442 states and 3479 transitions. [2021-11-23 16:50:43,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 16:50:43,603 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:43,603 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:43,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-23 16:50:43,818 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Ended with exit code 0 [2021-11-23 16:50:44,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:44,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:44,218 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:44,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:44,218 INFO L85 PathProgramCache]: Analyzing trace with hash -1694478255, now seen corresponding path program 1 times [2021-11-23 16:50:44,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:44,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1347105282] [2021-11-23 16:50:44,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:44,219 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:44,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:44,220 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:44,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 16:50:44,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:44,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:50:44,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:46,436 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 62 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:50:46,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:47,186 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 62 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:50:47,187 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:47,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1347105282] [2021-11-23 16:50:47,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1347105282] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:47,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [543243005] [2021-11-23 16:50:47,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:47,187 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:50:47,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:50:47,189 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:50:47,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 16:50:47,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:47,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:50:47,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:51,354 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:51,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:52,557 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:50:52,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [543243005] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:52,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699639650] [2021-11-23 16:50:52,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:52,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:50:52,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:52,559 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:50:52,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 16:50:52,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:52,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:50:52,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:54,951 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:50:54,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:50:56,054 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:50:56,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699639650] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:50:56,055 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:50:56,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 16:50:56,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600663072] [2021-11-23 16:50:56,056 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:50:56,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 16:50:56,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:56,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 16:50:56,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 16:50:56,059 INFO L87 Difference]: Start difference. First operand 2442 states and 3479 transitions. Second operand has 48 states, 48 states have (on average 10.25) internal successors, (492), 47 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:58,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:58,259 INFO L93 Difference]: Finished difference Result 2971 states and 4158 transitions. [2021-11-23 16:50:58,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 16:50:58,259 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 10.25) internal successors, (492), 47 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-23 16:50:58,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:58,262 INFO L225 Difference]: With dead ends: 2971 [2021-11-23 16:50:58,262 INFO L226 Difference]: Without dead ends: 2515 [2021-11-23 16:50:58,263 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 687 GetRequests, 621 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=395, Invalid=3765, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 16:50:58,265 INFO L933 BasicCegarLoop]: 1511 mSDtfsCounter, 7437 mSDsluCounter, 36220 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7437 SdHoareTripleChecker+Valid, 37731 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 136 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:58,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7437 Valid, 37731 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 73 Invalid, 0 Unknown, 136 Unchecked, 0.1s Time] [2021-11-23 16:50:58,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2515 states. [2021-11-23 16:50:58,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2515 to 2515. [2021-11-23 16:50:58,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2515 states, 2513 states have (on average 1.418225228810187) internal successors, (3564), 2514 states have internal predecessors, (3564), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:58,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2515 states to 2515 states and 3564 transitions. [2021-11-23 16:50:58,389 INFO L78 Accepts]: Start accepts. Automaton has 2515 states and 3564 transitions. Word has length 111 [2021-11-23 16:50:58,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:58,389 INFO L470 AbstractCegarLoop]: Abstraction has 2515 states and 3564 transitions. [2021-11-23 16:50:58,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 10.25) internal successors, (492), 47 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:50:58,390 INFO L276 IsEmpty]: Start isEmpty. Operand 2515 states and 3564 transitions. [2021-11-23 16:50:58,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 16:50:58,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:58,392 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:50:58,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:58,616 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-23 16:50:58,805 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Ended with exit code 0 [2021-11-23 16:50:58,997 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:58,997 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:58,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:58,998 INFO L85 PathProgramCache]: Analyzing trace with hash -1930363055, now seen corresponding path program 1 times [2021-11-23 16:50:58,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:58,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1881600649] [2021-11-23 16:50:58,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:58,998 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:58,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:58,999 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:59,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 16:50:59,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:59,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:50:59,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:00,882 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 66 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:51:00,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:01,795 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 66 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:51:01,795 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:01,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1881600649] [2021-11-23 16:51:01,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1881600649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:01,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [893278079] [2021-11-23 16:51:01,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:01,796 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:01,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:01,797 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:01,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 16:51:01,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:01,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:51:01,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:04,269 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:04,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:05,150 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:05,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [893278079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:05,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [232748416] [2021-11-23 16:51:05,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:05,151 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:05,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:05,152 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:05,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 16:51:05,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:05,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:51:05,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:07,201 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:51:07,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:08,294 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 39 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:51:08,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [232748416] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:08,295 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:51:08,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 16:51:08,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437831724] [2021-11-23 16:51:08,295 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:51:08,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 16:51:08,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:08,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 16:51:08,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 16:51:08,298 INFO L87 Difference]: Start difference. First operand 2515 states and 3564 transitions. Second operand has 39 states, 39 states have (on average 11.0) internal successors, (429), 38 states have internal predecessors, (429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:09,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:09,988 INFO L93 Difference]: Finished difference Result 3002 states and 4189 transitions. [2021-11-23 16:51:09,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 16:51:09,989 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 11.0) internal successors, (429), 38 states have internal predecessors, (429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-23 16:51:09,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:09,992 INFO L225 Difference]: With dead ends: 3002 [2021-11-23 16:51:09,992 INFO L226 Difference]: Without dead ends: 2542 [2021-11-23 16:51:09,993 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 629 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=365, Invalid=2605, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 16:51:09,994 INFO L933 BasicCegarLoop]: 1505 mSDtfsCounter, 13206 mSDsluCounter, 28505 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13206 SdHoareTripleChecker+Valid, 30010 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 121 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:09,994 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13206 Valid, 30010 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 99 Invalid, 0 Unknown, 121 Unchecked, 0.1s Time] [2021-11-23 16:51:09,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2542 states. [2021-11-23 16:51:10,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2542 to 2540. [2021-11-23 16:51:10,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2540 states, 2538 states have (on average 1.4125295508274232) internal successors, (3585), 2539 states have internal predecessors, (3585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:10,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2540 states to 2540 states and 3585 transitions. [2021-11-23 16:51:10,090 INFO L78 Accepts]: Start accepts. Automaton has 2540 states and 3585 transitions. Word has length 111 [2021-11-23 16:51:10,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:10,090 INFO L470 AbstractCegarLoop]: Abstraction has 2540 states and 3585 transitions. [2021-11-23 16:51:10,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 11.0) internal successors, (429), 38 states have internal predecessors, (429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:10,091 INFO L276 IsEmpty]: Start isEmpty. Operand 2540 states and 3585 transitions. [2021-11-23 16:51:10,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 16:51:10,093 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:10,094 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:10,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:10,334 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2021-11-23 16:51:10,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:10,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:10,710 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:10,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:10,710 INFO L85 PathProgramCache]: Analyzing trace with hash 1699429479, now seen corresponding path program 1 times [2021-11-23 16:51:10,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:10,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2009108645] [2021-11-23 16:51:10,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:10,711 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:10,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:10,712 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:10,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 16:51:10,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:10,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 16:51:10,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:18,003 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:18,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:21,061 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:21,061 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:21,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2009108645] [2021-11-23 16:51:21,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2009108645] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:21,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [578772956] [2021-11-23 16:51:21,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:21,062 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:21,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:21,062 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:21,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 16:51:21,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:21,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 16:51:21,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:27,337 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 61 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:51:27,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:31,400 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:31,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [578772956] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:31,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593649847] [2021-11-23 16:51:31,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:31,401 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:31,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:31,402 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:31,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 16:51:31,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:31,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:51:31,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:39,836 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:39,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:43,023 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:51:43,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [593649847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:43,023 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:51:43,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 22, 24, 18, 17] total 100 [2021-11-23 16:51:43,024 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556056177] [2021-11-23 16:51:43,024 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:51:43,025 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-11-23 16:51:43,025 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:43,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-11-23 16:51:43,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=930, Invalid=8970, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 16:51:43,026 INFO L87 Difference]: Start difference. First operand 2540 states and 3585 transitions. Second operand has 100 states, 100 states have (on average 5.2) internal successors, (520), 100 states have internal predecessors, (520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:49,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:49,656 INFO L93 Difference]: Finished difference Result 3171 states and 4357 transitions. [2021-11-23 16:51:49,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 16:51:49,657 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 5.2) internal successors, (520), 100 states have internal predecessors, (520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 16:51:49,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:49,659 INFO L225 Difference]: With dead ends: 3171 [2021-11-23 16:51:49,660 INFO L226 Difference]: Without dead ends: 2530 [2021-11-23 16:51:49,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 691 GetRequests, 573 SyntacticMatches, 3 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4928 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=1422, Invalid=12150, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 16:51:49,663 INFO L933 BasicCegarLoop]: 1496 mSDtfsCounter, 34795 mSDsluCounter, 42026 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34795 SdHoareTripleChecker+Valid, 43522 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 174 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:49,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34795 Valid, 43522 Invalid, 742 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [61 Valid, 507 Invalid, 0 Unknown, 174 Unchecked, 1.0s Time] [2021-11-23 16:51:49,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2530 states. [2021-11-23 16:51:49,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2530 to 2464. [2021-11-23 16:51:49,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2464 states, 2462 states have (on average 1.4220146222583265) internal successors, (3501), 2463 states have internal predecessors, (3501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:49,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2464 states to 2464 states and 3501 transitions. [2021-11-23 16:51:49,755 INFO L78 Accepts]: Start accepts. Automaton has 2464 states and 3501 transitions. Word has length 112 [2021-11-23 16:51:49,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:49,755 INFO L470 AbstractCegarLoop]: Abstraction has 2464 states and 3501 transitions. [2021-11-23 16:51:49,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 5.2) internal successors, (520), 100 states have internal predecessors, (520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:49,755 INFO L276 IsEmpty]: Start isEmpty. Operand 2464 states and 3501 transitions. [2021-11-23 16:51:49,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 16:51:49,757 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:49,757 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:49,792 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2021-11-23 16:51:49,985 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Ended with exit code 0 [2021-11-23 16:51:50,176 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Ended with exit code 0 [2021-11-23 16:51:50,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:50,375 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:50,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:50,376 INFO L85 PathProgramCache]: Analyzing trace with hash -510823495, now seen corresponding path program 1 times [2021-11-23 16:51:50,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:50,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1386789457] [2021-11-23 16:51:50,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:50,376 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:50,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:50,377 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:50,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 16:51:50,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:50,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:50,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:51,907 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:51:51,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:52,745 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:51:52,745 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:52,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1386789457] [2021-11-23 16:51:52,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1386789457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:52,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [713502903] [2021-11-23 16:51:52,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:52,746 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:52,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:52,747 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:52,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 16:51:52,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:52,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:52,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:54,237 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:51:54,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:54,911 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:51:54,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [713502903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:54,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1128280746] [2021-11-23 16:51:54,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:54,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:54,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:54,913 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:54,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 16:51:54,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:55,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:55,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:56,280 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:51:56,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:56,969 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:51:56,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1128280746] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:56,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:51:56,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:51:56,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821416407] [2021-11-23 16:51:56,970 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:51:56,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:51:56,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:56,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:51:56,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:51:56,972 INFO L87 Difference]: Start difference. First operand 2464 states and 3501 transitions. Second operand has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:57,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:57,419 INFO L93 Difference]: Finished difference Result 3378 states and 4672 transitions. [2021-11-23 16:51:57,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:51:57,420 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 16:51:57,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:57,423 INFO L225 Difference]: With dead ends: 3378 [2021-11-23 16:51:57,423 INFO L226 Difference]: Without dead ends: 2945 [2021-11-23 16:51:57,425 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 653 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2021-11-23 16:51:57,425 INFO L933 BasicCegarLoop]: 1515 mSDtfsCounter, 4437 mSDsluCounter, 12095 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4437 SdHoareTripleChecker+Valid, 13610 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:57,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4437 Valid, 13610 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 59 Unchecked, 0.0s Time] [2021-11-23 16:51:57,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2945 states. [2021-11-23 16:51:57,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2945 to 2923. [2021-11-23 16:51:57,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2923 states, 2921 states have (on average 1.3991783635741184) internal successors, (4087), 2922 states have internal predecessors, (4087), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:57,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2923 states to 2923 states and 4087 transitions. [2021-11-23 16:51:57,545 INFO L78 Accepts]: Start accepts. Automaton has 2923 states and 4087 transitions. Word has length 112 [2021-11-23 16:51:57,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:57,546 INFO L470 AbstractCegarLoop]: Abstraction has 2923 states and 4087 transitions. [2021-11-23 16:51:57,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.0625) internal successors, (161), 15 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:57,546 INFO L276 IsEmpty]: Start isEmpty. Operand 2923 states and 4087 transitions. [2021-11-23 16:51:57,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 16:51:57,548 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:57,548 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:57,559 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Ended with exit code 0 [2021-11-23 16:51:57,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Ended with exit code 0 [2021-11-23 16:51:57,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:58,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:58,151 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:58,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:58,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1336782839, now seen corresponding path program 1 times [2021-11-23 16:51:58,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:58,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [207961577] [2021-11-23 16:51:58,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:58,152 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:58,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:58,153 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:58,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 16:51:58,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:58,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:51:58,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:59,286 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 16:51:59,286 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:59,286 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:59,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [207961577] [2021-11-23 16:51:59,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [207961577] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:59,287 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:59,287 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:51:59,287 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407184681] [2021-11-23 16:51:59,287 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:59,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:51:59,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:59,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:51:59,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:51:59,289 INFO L87 Difference]: Start difference. First operand 2923 states and 4087 transitions. Second operand has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:59,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:59,427 INFO L93 Difference]: Finished difference Result 3395 states and 4692 transitions. [2021-11-23 16:51:59,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:51:59,428 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 16:51:59,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:59,431 INFO L225 Difference]: With dead ends: 3395 [2021-11-23 16:51:59,431 INFO L226 Difference]: Without dead ends: 2943 [2021-11-23 16:51:59,432 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:51:59,433 INFO L933 BasicCegarLoop]: 1514 mSDtfsCounter, 2942 mSDsluCounter, 3013 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2942 SdHoareTripleChecker+Valid, 4527 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:59,433 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2942 Valid, 4527 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 6 Invalid, 0 Unknown, 29 Unchecked, 0.0s Time] [2021-11-23 16:51:59,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2943 states. [2021-11-23 16:51:59,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2943 to 2923. [2021-11-23 16:51:59,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2923 states, 2921 states have (on average 1.3947278329339268) internal successors, (4074), 2922 states have internal predecessors, (4074), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:59,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2923 states to 2923 states and 4074 transitions. [2021-11-23 16:51:59,544 INFO L78 Accepts]: Start accepts. Automaton has 2923 states and 4074 transitions. Word has length 112 [2021-11-23 16:51:59,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:59,544 INFO L470 AbstractCegarLoop]: Abstraction has 2923 states and 4074 transitions. [2021-11-23 16:51:59,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 5 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:51:59,544 INFO L276 IsEmpty]: Start isEmpty. Operand 2923 states and 4074 transitions. [2021-11-23 16:51:59,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 16:51:59,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:59,546 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:51:59,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:59,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:59,749 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:59,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:59,750 INFO L85 PathProgramCache]: Analyzing trace with hash -604864759, now seen corresponding path program 1 times [2021-11-23 16:51:59,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:59,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [776826350] [2021-11-23 16:51:59,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:59,751 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:59,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:59,751 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:59,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2021-11-23 16:51:59,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:59,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:51:59,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:02,070 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 63 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:52:02,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:02,811 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 63 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:52:02,811 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:02,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [776826350] [2021-11-23 16:52:02,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [776826350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:02,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [898768597] [2021-11-23 16:52:02,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:02,812 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:02,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:02,814 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:02,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2021-11-23 16:52:02,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:02,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:02,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:04,741 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:52:04,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:05,702 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:52:05,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [898768597] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:05,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425575350] [2021-11-23 16:52:05,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:05,703 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:05,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:05,704 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:05,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-23 16:52:05,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:05,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:05,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:07,130 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:52:07,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:07,858 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:52:07,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425575350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:07,858 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:07,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 16:52:07,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517223280] [2021-11-23 16:52:07,859 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:07,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 16:52:07,860 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:07,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 16:52:07,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 16:52:07,861 INFO L87 Difference]: Start difference. First operand 2923 states and 4074 transitions. Second operand has 32 states, 32 states have (on average 9.9375) internal successors, (318), 31 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:09,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:09,910 INFO L93 Difference]: Finished difference Result 4137 states and 5617 transitions. [2021-11-23 16:52:09,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 16:52:09,910 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 9.9375) internal successors, (318), 31 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 16:52:09,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:09,914 INFO L225 Difference]: With dead ends: 4137 [2021-11-23 16:52:09,915 INFO L226 Difference]: Without dead ends: 3681 [2021-11-23 16:52:09,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 693 GetRequests, 641 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=304, Invalid=2348, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 16:52:09,917 INFO L933 BasicCegarLoop]: 1525 mSDtfsCounter, 8833 mSDsluCounter, 25913 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8833 SdHoareTripleChecker+Valid, 27438 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 200 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:09,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8833 Valid, 27438 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 82 Invalid, 0 Unknown, 200 Unchecked, 0.1s Time] [2021-11-23 16:52:09,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3681 states. [2021-11-23 16:52:10,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3681 to 3665. [2021-11-23 16:52:10,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3665 states, 3663 states have (on average 1.3666393666393666) internal successors, (5006), 3664 states have internal predecessors, (5006), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:10,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3665 states to 3665 states and 5006 transitions. [2021-11-23 16:52:10,097 INFO L78 Accepts]: Start accepts. Automaton has 3665 states and 5006 transitions. Word has length 112 [2021-11-23 16:52:10,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:10,097 INFO L470 AbstractCegarLoop]: Abstraction has 3665 states and 5006 transitions. [2021-11-23 16:52:10,098 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 9.9375) internal successors, (318), 31 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:10,098 INFO L276 IsEmpty]: Start isEmpty. Operand 3665 states and 5006 transitions. [2021-11-23 16:52:10,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 16:52:10,100 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:10,100 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:10,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:10,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:10,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:10,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:10,701 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:10,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:10,702 INFO L85 PathProgramCache]: Analyzing trace with hash -840749559, now seen corresponding path program 1 times [2021-11-23 16:52:10,703 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:10,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2113535983] [2021-11-23 16:52:10,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:10,703 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:10,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:10,704 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:10,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 16:52:10,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:10,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:52:10,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:12,651 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 67 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:52:12,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:13,592 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 67 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:52:13,592 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:13,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2113535983] [2021-11-23 16:52:13,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2113535983] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:13,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1145746780] [2021-11-23 16:52:13,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:13,592 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:13,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:13,593 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:13,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2021-11-23 16:52:13,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:13,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:13,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:15,064 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:52:15,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:15,757 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:52:15,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1145746780] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:15,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525553942] [2021-11-23 16:52:15,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:15,758 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:15,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:15,759 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:15,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-23 16:52:15,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:15,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:15,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:17,118 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:52:17,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:17,774 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 40 proven. 26 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 16:52:17,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525553942] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:17,774 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:17,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 19 [2021-11-23 16:52:17,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178214303] [2021-11-23 16:52:17,775 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:17,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 16:52:17,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:17,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 16:52:17,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:52:17,776 INFO L87 Difference]: Start difference. First operand 3665 states and 5006 transitions. Second operand has 20 states, 20 states have (on average 11.45) internal successors, (229), 19 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:18,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:18,626 INFO L93 Difference]: Finished difference Result 5656 states and 7526 transitions. [2021-11-23 16:52:18,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 16:52:18,626 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 11.45) internal successors, (229), 19 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 16:52:18,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:18,633 INFO L225 Difference]: With dead ends: 5656 [2021-11-23 16:52:18,634 INFO L226 Difference]: Without dead ends: 5196 [2021-11-23 16:52:18,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 679 GetRequests, 651 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=155, Invalid=715, Unknown=0, NotChecked=0, Total=870 [2021-11-23 16:52:18,637 INFO L933 BasicCegarLoop]: 1535 mSDtfsCounter, 7439 mSDsluCounter, 15540 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7439 SdHoareTripleChecker+Valid, 17075 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 191 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:18,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7439 Valid, 17075 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 67 Invalid, 0 Unknown, 191 Unchecked, 0.1s Time] [2021-11-23 16:52:18,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5196 states. [2021-11-23 16:52:19,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5196 to 5151. [2021-11-23 16:52:19,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5151 states, 5149 states have (on average 1.3301611963488056) internal successors, (6849), 5150 states have internal predecessors, (6849), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:19,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5151 states to 5151 states and 6849 transitions. [2021-11-23 16:52:19,011 INFO L78 Accepts]: Start accepts. Automaton has 5151 states and 6849 transitions. Word has length 112 [2021-11-23 16:52:19,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:19,012 INFO L470 AbstractCegarLoop]: Abstraction has 5151 states and 6849 transitions. [2021-11-23 16:52:19,012 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 11.45) internal successors, (229), 19 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:19,012 INFO L276 IsEmpty]: Start isEmpty. Operand 5151 states and 6849 transitions. [2021-11-23 16:52:19,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 16:52:19,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:19,014 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:19,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:19,240 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Ended with exit code 0 [2021-11-23 16:52:19,425 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:19,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:19,615 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:19,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:19,616 INFO L85 PathProgramCache]: Analyzing trace with hash -803262144, now seen corresponding path program 1 times [2021-11-23 16:52:19,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:19,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1204340071] [2021-11-23 16:52:19,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:19,617 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:19,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:19,617 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:19,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-23 16:52:19,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:19,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:19,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:21,595 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:52:21,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:22,385 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:52:22,385 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:22,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1204340071] [2021-11-23 16:52:22,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1204340071] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:22,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1850996092] [2021-11-23 16:52:22,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:22,386 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:22,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:22,387 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:22,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2021-11-23 16:52:22,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:22,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:22,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:24,387 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:52:24,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:24,955 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:52:24,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1850996092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:24,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15276698] [2021-11-23 16:52:24,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:24,956 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:24,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:24,957 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:24,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-23 16:52:25,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:25,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:25,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:26,819 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:52:26,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:27,528 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 16:52:27,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15276698] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:27,529 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:27,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:52:27,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641332259] [2021-11-23 16:52:27,529 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:27,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:52:27,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:27,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:52:27,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:52:27,531 INFO L87 Difference]: Start difference. First operand 5151 states and 6849 transitions. Second operand has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:28,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:28,302 INFO L93 Difference]: Finished difference Result 8172 states and 10656 transitions. [2021-11-23 16:52:28,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:52:28,302 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 16:52:28,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:28,310 INFO L225 Difference]: With dead ends: 8172 [2021-11-23 16:52:28,310 INFO L226 Difference]: Without dead ends: 7125 [2021-11-23 16:52:28,312 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 654 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-11-23 16:52:28,313 INFO L933 BasicCegarLoop]: 1522 mSDtfsCounter, 4467 mSDsluCounter, 13609 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4467 SdHoareTripleChecker+Valid, 15131 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:28,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4467 Valid, 15131 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 90 Unchecked, 0.1s Time] [2021-11-23 16:52:28,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7125 states. [2021-11-23 16:52:28,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7125 to 7101. [2021-11-23 16:52:28,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7101 states, 7099 states have (on average 1.30271869277363) internal successors, (9248), 7100 states have internal predecessors, (9248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:28,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7101 states to 7101 states and 9248 transitions. [2021-11-23 16:52:28,894 INFO L78 Accepts]: Start accepts. Automaton has 7101 states and 9248 transitions. Word has length 112 [2021-11-23 16:52:28,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:28,895 INFO L470 AbstractCegarLoop]: Abstraction has 7101 states and 9248 transitions. [2021-11-23 16:52:28,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:28,895 INFO L276 IsEmpty]: Start isEmpty. Operand 7101 states and 9248 transitions. [2021-11-23 16:52:28,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 16:52:28,897 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:28,898 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:28,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:29,123 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Ended with exit code 0 [2021-11-23 16:52:29,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:29,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:29,499 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:29,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:29,499 INFO L85 PathProgramCache]: Analyzing trace with hash -7680944, now seen corresponding path program 1 times [2021-11-23 16:52:29,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:29,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1368875366] [2021-11-23 16:52:29,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:29,500 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:29,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:29,501 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:29,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Waiting until timeout for monitored process [2021-11-23 16:52:29,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:29,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:52:29,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:30,620 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 16:52:30,620 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:30,620 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:30,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1368875366] [2021-11-23 16:52:30,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1368875366] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:30,620 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:30,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:52:30,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943473653] [2021-11-23 16:52:30,621 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:30,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:52:30,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:30,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:52:30,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:52:30,622 INFO L87 Difference]: Start difference. First operand 7101 states and 9248 transitions. Second operand has 6 states, 6 states have (on average 17.166666666666668) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:31,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:31,165 INFO L93 Difference]: Finished difference Result 9333 states and 12079 transitions. [2021-11-23 16:52:31,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:52:31,165 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.166666666666668) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 16:52:31,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:31,175 INFO L225 Difference]: With dead ends: 9333 [2021-11-23 16:52:31,175 INFO L226 Difference]: Without dead ends: 8135 [2021-11-23 16:52:31,178 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:52:31,179 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 1516 mSDsluCounter, 3019 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1516 SdHoareTripleChecker+Valid, 4540 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 46 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:31,179 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1516 Valid, 4540 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 46 Unchecked, 0.0s Time] [2021-11-23 16:52:31,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8135 states. [2021-11-23 16:52:31,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8135 to 8093. [2021-11-23 16:52:31,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8093 states, 8091 states have (on average 1.2924236806328018) internal successors, (10457), 8092 states have internal predecessors, (10457), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:31,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8093 states to 8093 states and 10457 transitions. [2021-11-23 16:52:31,879 INFO L78 Accepts]: Start accepts. Automaton has 8093 states and 10457 transitions. Word has length 112 [2021-11-23 16:52:31,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:31,880 INFO L470 AbstractCegarLoop]: Abstraction has 8093 states and 10457 transitions. [2021-11-23 16:52:31,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.166666666666668) internal successors, (103), 5 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:31,880 INFO L276 IsEmpty]: Start isEmpty. Operand 8093 states and 10457 transitions. [2021-11-23 16:52:31,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 16:52:31,882 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:31,882 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:31,893 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Ended with exit code 0 [2021-11-23 16:52:32,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:32,085 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:32,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:32,086 INFO L85 PathProgramCache]: Analyzing trace with hash 1933874233, now seen corresponding path program 1 times [2021-11-23 16:52:32,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:32,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1292031750] [2021-11-23 16:52:32,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:32,086 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:32,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:32,087 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:32,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 16:52:32,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:32,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:52:32,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:35,095 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:35,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:36,224 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:36,224 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:36,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1292031750] [2021-11-23 16:52:36,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1292031750] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:36,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1165528534] [2021-11-23 16:52:36,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:36,225 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:36,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:36,226 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:36,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 16:52:36,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:36,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:52:36,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:38,873 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:38,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:39,628 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:39,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1165528534] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:39,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298647643] [2021-11-23 16:52:39,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:39,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:39,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:39,632 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:39,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 16:52:39,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:39,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:52:39,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:42,242 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:42,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:43,097 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:43,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298647643] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:43,097 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:43,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 25 [2021-11-23 16:52:43,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672678904] [2021-11-23 16:52:43,098 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:43,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 16:52:43,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:43,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 16:52:43,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2021-11-23 16:52:43,100 INFO L87 Difference]: Start difference. First operand 8093 states and 10457 transitions. Second operand has 26 states, 26 states have (on average 8.115384615384615) internal successors, (211), 25 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:45,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:45,650 INFO L93 Difference]: Finished difference Result 15168 states and 19337 transitions. [2021-11-23 16:52:45,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-23 16:52:45,650 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 8.115384615384615) internal successors, (211), 25 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 16:52:45,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:45,662 INFO L225 Difference]: With dead ends: 15168 [2021-11-23 16:52:45,662 INFO L226 Difference]: Without dead ends: 11293 [2021-11-23 16:52:45,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 699 GetRequests, 647 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 722 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=297, Invalid=2565, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 16:52:45,668 INFO L933 BasicCegarLoop]: 1569 mSDtfsCounter, 7435 mSDsluCounter, 24700 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7435 SdHoareTripleChecker+Valid, 26269 SdHoareTripleChecker+Invalid, 567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 276 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:45,669 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7435 Valid, 26269 Invalid, 567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 264 Invalid, 0 Unknown, 276 Unchecked, 0.4s Time] [2021-11-23 16:52:45,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11293 states. [2021-11-23 16:52:46,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11293 to 6666. [2021-11-23 16:52:46,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6666 states, 6664 states have (on average 1.2941176470588236) internal successors, (8624), 6665 states have internal predecessors, (8624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:46,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6666 states to 6666 states and 8624 transitions. [2021-11-23 16:52:46,170 INFO L78 Accepts]: Start accepts. Automaton has 6666 states and 8624 transitions. Word has length 112 [2021-11-23 16:52:46,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:46,171 INFO L470 AbstractCegarLoop]: Abstraction has 6666 states and 8624 transitions. [2021-11-23 16:52:46,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 8.115384615384615) internal successors, (211), 25 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:46,171 INFO L276 IsEmpty]: Start isEmpty. Operand 6666 states and 8624 transitions. [2021-11-23 16:52:46,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 16:52:46,174 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:46,175 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:46,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:46,405 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:46,587 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Ended with exit code 0 [2021-11-23 16:52:46,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:46,777 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:46,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:46,778 INFO L85 PathProgramCache]: Analyzing trace with hash 228754537, now seen corresponding path program 1 times [2021-11-23 16:52:46,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:46,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1308228060] [2021-11-23 16:52:46,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:46,778 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:46,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:46,780 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:46,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 16:52:46,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:46,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:52:46,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:49,192 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:52:49,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:50,107 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 58 proven. 32 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:52:50,107 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:50,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1308228060] [2021-11-23 16:52:50,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1308228060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:50,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1958762144] [2021-11-23 16:52:50,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:50,108 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:50,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:50,109 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:50,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-23 16:52:50,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:50,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:52:50,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:54,163 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:54,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:55,457 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:55,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1958762144] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:55,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931379786] [2021-11-23 16:52:55,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:55,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:55,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:55,459 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:55,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 16:52:55,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:55,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:52:55,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:58,619 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:58,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:59,373 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:59,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931379786] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:59,373 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:59,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 13, 13] total 39 [2021-11-23 16:52:59,374 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649773073] [2021-11-23 16:52:59,374 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:59,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 16:52:59,375 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:59,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 16:52:59,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1425, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 16:52:59,376 INFO L87 Difference]: Start difference. First operand 6666 states and 8624 transitions. Second operand has 40 states, 40 states have (on average 9.125) internal successors, (365), 39 states have internal predecessors, (365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:12,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:12,470 INFO L93 Difference]: Finished difference Result 16742 states and 21151 transitions. [2021-11-23 16:53:12,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2021-11-23 16:53:12,470 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 9.125) internal successors, (365), 39 states have internal predecessors, (365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 16:53:12,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:12,487 INFO L225 Difference]: With dead ends: 16742 [2021-11-23 16:53:12,487 INFO L226 Difference]: Without dead ends: 13786 [2021-11-23 16:53:12,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 819 GetRequests, 642 SyntacticMatches, 6 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10950 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=2110, Invalid=27646, Unknown=0, NotChecked=0, Total=29756 [2021-11-23 16:53:12,496 INFO L933 BasicCegarLoop]: 1592 mSDtfsCounter, 15341 mSDsluCounter, 33479 mSDsCounter, 0 mSdLazyCounter, 1242 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15341 SdHoareTripleChecker+Valid, 35071 SdHoareTripleChecker+Invalid, 2871 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 1242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1534 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:12,496 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15341 Valid, 35071 Invalid, 2871 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [95 Valid, 1242 Invalid, 0 Unknown, 1534 Unchecked, 1.9s Time] [2021-11-23 16:53:12,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13786 states. [2021-11-23 16:53:13,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13786 to 8425. [2021-11-23 16:53:13,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8425 states, 8423 states have (on average 1.2774545886263802) internal successors, (10760), 8424 states have internal predecessors, (10760), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:13,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8425 states to 8425 states and 10760 transitions. [2021-11-23 16:53:13,215 INFO L78 Accepts]: Start accepts. Automaton has 8425 states and 10760 transitions. Word has length 112 [2021-11-23 16:53:13,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:13,216 INFO L470 AbstractCegarLoop]: Abstraction has 8425 states and 10760 transitions. [2021-11-23 16:53:13,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 9.125) internal successors, (365), 39 states have internal predecessors, (365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:13,216 INFO L276 IsEmpty]: Start isEmpty. Operand 8425 states and 10760 transitions. [2021-11-23 16:53:13,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 16:53:13,219 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:13,220 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:13,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:13,434 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Ended with exit code 0 [2021-11-23 16:53:13,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:13,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:13,834 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:13,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:13,834 INFO L85 PathProgramCache]: Analyzing trace with hash -1937446341, now seen corresponding path program 1 times [2021-11-23 16:53:13,835 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:13,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1122242849] [2021-11-23 16:53:13,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:13,835 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:13,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:13,836 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:13,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 16:53:13,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:13,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:53:13,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:15,849 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:53:15,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:16,863 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:53:16,864 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:16,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1122242849] [2021-11-23 16:53:16,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1122242849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:16,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [988438288] [2021-11-23 16:53:16,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:16,864 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:16,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:16,865 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:16,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-23 16:53:17,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:17,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:53:17,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:18,728 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:53:18,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:19,443 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:53:19,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [988438288] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:19,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216525935] [2021-11-23 16:53:19,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:19,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:19,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:19,445 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:19,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-23 16:53:19,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:19,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:53:19,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:21,314 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:53:21,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:22,040 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 64 proven. 20 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:53:22,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216525935] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:22,040 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:22,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 19 [2021-11-23 16:53:22,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796832554] [2021-11-23 16:53:22,041 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:22,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 16:53:22,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:22,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 16:53:22,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:53:22,042 INFO L87 Difference]: Start difference. First operand 8425 states and 10760 transitions. Second operand has 20 states, 20 states have (on average 8.95) internal successors, (179), 19 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:22,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:22,723 INFO L93 Difference]: Finished difference Result 11429 states and 14439 transitions. [2021-11-23 16:53:22,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:53:22,724 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 8.95) internal successors, (179), 19 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-23 16:53:22,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:22,737 INFO L225 Difference]: With dead ends: 11429 [2021-11-23 16:53:22,737 INFO L226 Difference]: Without dead ends: 8233 [2021-11-23 16:53:22,743 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 648 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 16:53:22,744 INFO L933 BasicCegarLoop]: 1519 mSDtfsCounter, 2935 mSDsluCounter, 18178 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2935 SdHoareTripleChecker+Valid, 19697 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 132 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:22,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2935 Valid, 19697 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 132 Unchecked, 0.1s Time] [2021-11-23 16:53:22,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8233 states. [2021-11-23 16:53:23,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8233 to 8233. [2021-11-23 16:53:23,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8233 states, 8231 states have (on average 1.2789454501275666) internal successors, (10527), 8232 states have internal predecessors, (10527), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:23,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8233 states to 8233 states and 10527 transitions. [2021-11-23 16:53:23,396 INFO L78 Accepts]: Start accepts. Automaton has 8233 states and 10527 transitions. Word has length 112 [2021-11-23 16:53:23,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:23,396 INFO L470 AbstractCegarLoop]: Abstraction has 8233 states and 10527 transitions. [2021-11-23 16:53:23,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 8.95) internal successors, (179), 19 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:23,396 INFO L276 IsEmpty]: Start isEmpty. Operand 8233 states and 10527 transitions. [2021-11-23 16:53:23,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 16:53:23,398 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:23,398 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:23,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:23,625 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Ended with exit code 0 [2021-11-23 16:53:23,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:23,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:23,999 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:23,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:24,000 INFO L85 PathProgramCache]: Analyzing trace with hash 1117709487, now seen corresponding path program 1 times [2021-11-23 16:53:24,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:24,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1040480138] [2021-11-23 16:53:24,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:24,000 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:24,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:24,001 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:24,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 16:53:24,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:24,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 16:53:24,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:31,546 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 26 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:31,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:34,643 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:34,644 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:34,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1040480138] [2021-11-23 16:53:34,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1040480138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:34,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1133500267] [2021-11-23 16:53:34,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:34,644 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:34,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:34,645 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:34,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-23 16:53:34,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:34,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 16:53:34,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:44,959 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 26 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:44,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:49,302 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:49,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1133500267] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:49,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115031916] [2021-11-23 16:53:49,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:49,303 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:49,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:49,304 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:49,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 16:53:49,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:49,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:53:49,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:59,088 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:53:59,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:02,383 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:02,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115031916] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:02,384 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:54:02,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 30, 24, 22, 17] total 105 [2021-11-23 16:54:02,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029197601] [2021-11-23 16:54:02,384 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:54:02,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-11-23 16:54:02,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:02,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-11-23 16:54:02,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=980, Invalid=9940, Unknown=0, NotChecked=0, Total=10920 [2021-11-23 16:54:02,387 INFO L87 Difference]: Start difference. First operand 8233 states and 10527 transitions. Second operand has 105 states, 105 states have (on average 4.771428571428571) internal successors, (501), 105 states have internal predecessors, (501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:16,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:16,070 INFO L93 Difference]: Finished difference Result 15258 states and 19087 transitions. [2021-11-23 16:54:16,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-23 16:54:16,071 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 4.771428571428571) internal successors, (501), 105 states have internal predecessors, (501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-23 16:54:16,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:16,083 INFO L225 Difference]: With dead ends: 15258 [2021-11-23 16:54:16,084 INFO L226 Difference]: Without dead ends: 10940 [2021-11-23 16:54:16,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 715 GetRequests, 569 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8107 ImplicationChecksByTransitivity, 26.5s TimeCoverageRelationStatistics Valid=1645, Invalid=19525, Unknown=0, NotChecked=0, Total=21170 [2021-11-23 16:54:16,091 INFO L933 BasicCegarLoop]: 1644 mSDtfsCounter, 29544 mSDsluCounter, 36856 mSDsCounter, 0 mSdLazyCounter, 1958 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29544 SdHoareTripleChecker+Valid, 38500 SdHoareTripleChecker+Invalid, 2447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 1958 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 417 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:16,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29544 Valid, 38500 Invalid, 2447 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [72 Valid, 1958 Invalid, 0 Unknown, 417 Unchecked, 3.9s Time] [2021-11-23 16:54:16,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10940 states. [2021-11-23 16:54:16,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10940 to 9523. [2021-11-23 16:54:16,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9523 states, 9521 states have (on average 1.270874908097889) internal successors, (12100), 9522 states have internal predecessors, (12100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:16,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9523 states to 9523 states and 12100 transitions. [2021-11-23 16:54:16,976 INFO L78 Accepts]: Start accepts. Automaton has 9523 states and 12100 transitions. Word has length 113 [2021-11-23 16:54:16,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:16,977 INFO L470 AbstractCegarLoop]: Abstraction has 9523 states and 12100 transitions. [2021-11-23 16:54:16,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 4.771428571428571) internal successors, (501), 105 states have internal predecessors, (501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:16,977 INFO L276 IsEmpty]: Start isEmpty. Operand 9523 states and 12100 transitions. [2021-11-23 16:54:16,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 16:54:16,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:16,979 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:16,990 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Ended with exit code 0 [2021-11-23 16:54:17,181 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Ended with exit code 0 [2021-11-23 16:54:17,405 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:17,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:17,580 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:17,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:17,581 INFO L85 PathProgramCache]: Analyzing trace with hash 2048005298, now seen corresponding path program 1 times [2021-11-23 16:54:17,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:17,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1552852985] [2021-11-23 16:54:17,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:17,581 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:17,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:17,583 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:17,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 16:54:17,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:17,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:54:17,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:19,083 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 52 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:54:19,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:19,756 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:54:19,756 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:19,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1552852985] [2021-11-23 16:54:19,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1552852985] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:19,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [216496557] [2021-11-23 16:54:19,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:19,757 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:19,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:19,758 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:19,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-23 16:54:19,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:19,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:54:19,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:21,465 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 52 proven. 38 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:54:21,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:21,820 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:54:21,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [216496557] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:21,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [858151837] [2021-11-23 16:54:21,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:21,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:21,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:21,821 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:21,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 16:54:21,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:21,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:54:21,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:22,840 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 54 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:54:22,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:23,243 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:54:23,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [858151837] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:23,244 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:54:23,244 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 15, 11, 12, 11] total 33 [2021-11-23 16:54:23,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718046132] [2021-11-23 16:54:23,244 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:54:23,245 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 16:54:23,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:23,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 16:54:23,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 16:54:23,246 INFO L87 Difference]: Start difference. First operand 9523 states and 12100 transitions. Second operand has 33 states, 33 states have (on average 8.242424242424242) internal successors, (272), 33 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:25,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:25,799 INFO L93 Difference]: Finished difference Result 23913 states and 29796 transitions. [2021-11-23 16:54:25,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 16:54:25,800 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 8.242424242424242) internal successors, (272), 33 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-23 16:54:25,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:25,829 INFO L225 Difference]: With dead ends: 23913 [2021-11-23 16:54:25,829 INFO L226 Difference]: Without dead ends: 18865 [2021-11-23 16:54:25,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 643 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=275, Invalid=1531, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 16:54:25,837 INFO L933 BasicCegarLoop]: 1607 mSDtfsCounter, 9045 mSDsluCounter, 18719 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9045 SdHoareTripleChecker+Valid, 20326 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:25,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9045 Valid, 20326 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 189 Invalid, 0 Unknown, 114 Unchecked, 0.3s Time] [2021-11-23 16:54:25,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18865 states. [2021-11-23 16:54:27,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18865 to 16921. [2021-11-23 16:54:27,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16921 states, 16919 states have (on average 1.2511968792481825) internal successors, (21169), 16920 states have internal predecessors, (21169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:27,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16921 states to 16921 states and 21169 transitions. [2021-11-23 16:54:27,309 INFO L78 Accepts]: Start accepts. Automaton has 16921 states and 21169 transitions. Word has length 113 [2021-11-23 16:54:27,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:27,309 INFO L470 AbstractCegarLoop]: Abstraction has 16921 states and 21169 transitions. [2021-11-23 16:54:27,309 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 8.242424242424242) internal successors, (272), 33 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:27,309 INFO L276 IsEmpty]: Start isEmpty. Operand 16921 states and 21169 transitions. [2021-11-23 16:54:27,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 16:54:27,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:27,312 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:27,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:27,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:27,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:27,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:27,913 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:27,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:27,913 INFO L85 PathProgramCache]: Analyzing trace with hash -1844428728, now seen corresponding path program 1 times [2021-11-23 16:54:27,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:27,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1868154782] [2021-11-23 16:54:27,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:27,915 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:27,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:27,916 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:27,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 16:54:28,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:28,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:54:28,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:29,680 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 27 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:29,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:30,523 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 44 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:30,523 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:30,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1868154782] [2021-11-23 16:54:30,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1868154782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:30,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [388360272] [2021-11-23 16:54:30,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:30,524 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:30,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:30,525 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:30,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-23 16:54:30,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:30,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:54:30,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:31,958 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 27 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:31,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:32,453 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 44 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:32,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [388360272] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:32,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774311807] [2021-11-23 16:54:32,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:32,454 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:32,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:32,455 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:32,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-23 16:54:32,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:32,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 16:54:32,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:38,434 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:38,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:39,735 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 44 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:39,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1774311807] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:39,736 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:54:39,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 21, 15] total 48 [2021-11-23 16:54:39,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655104815] [2021-11-23 16:54:39,736 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:54:39,737 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 16:54:39,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:39,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 16:54:39,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=2000, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 16:54:39,738 INFO L87 Difference]: Start difference. First operand 16921 states and 21169 transitions. Second operand has 48 states, 48 states have (on average 6.9375) internal successors, (333), 48 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:45,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:45,957 INFO L93 Difference]: Finished difference Result 39075 states and 48311 transitions. [2021-11-23 16:54:45,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-23 16:54:45,958 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 6.9375) internal successors, (333), 48 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-23 16:54:45,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:45,991 INFO L225 Difference]: With dead ends: 39075 [2021-11-23 16:54:45,991 INFO L226 Difference]: Without dead ends: 27109 [2021-11-23 16:54:46,003 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 732 GetRequests, 642 SyntacticMatches, 17 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2183 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=736, Invalid=4814, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 16:54:46,004 INFO L933 BasicCegarLoop]: 1608 mSDtfsCounter, 14011 mSDsluCounter, 31327 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14011 SdHoareTripleChecker+Valid, 32935 SdHoareTripleChecker+Invalid, 1102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 753 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:46,004 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14011 Valid, 32935 Invalid, 1102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 328 Invalid, 0 Unknown, 753 Unchecked, 0.6s Time] [2021-11-23 16:54:46,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27109 states. [2021-11-23 16:54:48,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27109 to 21354. [2021-11-23 16:54:48,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21354 states, 21352 states have (on average 1.2477051330086175) internal successors, (26641), 21353 states have internal predecessors, (26641), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:48,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21354 states to 21354 states and 26641 transitions. [2021-11-23 16:54:48,299 INFO L78 Accepts]: Start accepts. Automaton has 21354 states and 26641 transitions. Word has length 113 [2021-11-23 16:54:48,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:48,299 INFO L470 AbstractCegarLoop]: Abstraction has 21354 states and 26641 transitions. [2021-11-23 16:54:48,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 6.9375) internal successors, (333), 48 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:48,299 INFO L276 IsEmpty]: Start isEmpty. Operand 21354 states and 26641 transitions. [2021-11-23 16:54:48,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 16:54:48,301 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:48,301 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:48,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:48,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:48,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:48,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:48,902 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:48,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:48,903 INFO L85 PathProgramCache]: Analyzing trace with hash 588226190, now seen corresponding path program 1 times [2021-11-23 16:54:48,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:48,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [997063810] [2021-11-23 16:54:48,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:48,903 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:48,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:48,904 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:48,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-23 16:54:48,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:48,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 16:54:49,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:56,945 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 35 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:54:56,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:01,483 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 25 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:01,483 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:01,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [997063810] [2021-11-23 16:55:01,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [997063810] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:01,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2040027813] [2021-11-23 16:55:01,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:01,484 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:01,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:01,485 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:01,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Waiting until timeout for monitored process [2021-11-23 16:55:01,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:01,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 16:55:01,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:11,442 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 35 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:11,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:20,232 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 21 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:20,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2040027813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:20,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2037825852] [2021-11-23 16:55:20,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:20,233 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:20,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:20,234 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:20,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-23 16:55:20,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:20,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 16:55:20,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:26,997 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 35 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:26,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:33,835 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 21 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:33,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2037825852] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:33,836 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:33,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 30, 28, 24, 24] total 133 [2021-11-23 16:55:33,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706797359] [2021-11-23 16:55:33,836 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:33,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-23 16:55:33,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:33,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-23 16:55:33,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2045, Invalid=15511, Unknown=0, NotChecked=0, Total=17556 [2021-11-23 16:55:33,839 INFO L87 Difference]: Start difference. First operand 21354 states and 26641 transitions. Second operand has 133 states, 133 states have (on average 3.917293233082707) internal successors, (521), 133 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:53,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:53,841 INFO L93 Difference]: Finished difference Result 31773 states and 39280 transitions. [2021-11-23 16:55:53,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-23 16:55:53,842 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 3.917293233082707) internal successors, (521), 133 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-23 16:55:53,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:53,870 INFO L225 Difference]: With dead ends: 31773 [2021-11-23 16:55:53,870 INFO L226 Difference]: Without dead ends: 24256 [2021-11-23 16:55:54,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 726 GetRequests, 553 SyntacticMatches, 5 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10668 ImplicationChecksByTransitivity, 40.9s TimeCoverageRelationStatistics Valid=3412, Invalid=25318, Unknown=0, NotChecked=0, Total=28730 [2021-11-23 16:55:54,011 INFO L933 BasicCegarLoop]: 1546 mSDtfsCounter, 43401 mSDsluCounter, 43724 mSDsCounter, 0 mSdLazyCounter, 1528 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43401 SdHoareTripleChecker+Valid, 45270 SdHoareTripleChecker+Invalid, 1811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 1528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 185 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:54,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43401 Valid, 45270 Invalid, 1811 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [98 Valid, 1528 Invalid, 0 Unknown, 185 Unchecked, 3.2s Time] [2021-11-23 16:55:54,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24256 states. [2021-11-23 16:55:56,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24256 to 21389. [2021-11-23 16:55:56,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21389 states, 21387 states have (on average 1.2474400336653106) internal successors, (26679), 21388 states have internal predecessors, (26679), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:56,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21389 states to 21389 states and 26679 transitions. [2021-11-23 16:55:56,213 INFO L78 Accepts]: Start accepts. Automaton has 21389 states and 26679 transitions. Word has length 113 [2021-11-23 16:55:56,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:56,213 INFO L470 AbstractCegarLoop]: Abstraction has 21389 states and 26679 transitions. [2021-11-23 16:55:56,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 3.917293233082707) internal successors, (521), 133 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:56,213 INFO L276 IsEmpty]: Start isEmpty. Operand 21389 states and 26679 transitions. [2021-11-23 16:55:56,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 16:55:56,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:56,216 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:56,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:56,426 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:56,641 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Ended with exit code 0 [2021-11-23 16:55:56,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:56,817 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:56,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:56,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1890239409, now seen corresponding path program 1 times [2021-11-23 16:55:56,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:56,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [608236842] [2021-11-23 16:55:56,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:56,818 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:56,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:56,820 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:56,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2021-11-23 16:55:56,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:56,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 16:55:56,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:05,870 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:05,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:09,539 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:09,539 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:09,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [608236842] [2021-11-23 16:56:09,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [608236842] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:09,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [971471420] [2021-11-23 16:56:09,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:09,540 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:09,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:56:09,543 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:56:09,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Waiting until timeout for monitored process [2021-11-23 16:56:09,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:09,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 16:56:09,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:20,309 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:20,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:24,412 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:24,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [971471420] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:24,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848889005] [2021-11-23 16:56:24,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:24,413 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:24,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:56:24,414 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:56:24,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-23 16:56:24,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:24,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:56:24,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:29,812 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:29,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:32,214 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 16 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:32,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [848889005] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:32,215 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:56:32,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 22, 28, 24, 18, 17] total 104 [2021-11-23 16:56:32,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108837205] [2021-11-23 16:56:32,215 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:56:32,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2021-11-23 16:56:32,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:32,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-11-23 16:56:32,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=977, Invalid=9735, Unknown=0, NotChecked=0, Total=10712 [2021-11-23 16:56:32,218 INFO L87 Difference]: Start difference. First operand 21389 states and 26679 transitions. Second operand has 104 states, 104 states have (on average 4.730769230769231) internal successors, (492), 104 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:41,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:41,617 INFO L93 Difference]: Finished difference Result 26150 states and 32525 transitions. [2021-11-23 16:56:41,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-23 16:56:41,618 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 4.730769230769231) internal successors, (492), 104 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-23 16:56:41,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:41,642 INFO L225 Difference]: With dead ends: 26150 [2021-11-23 16:56:41,643 INFO L226 Difference]: Without dead ends: 21991 [2021-11-23 16:56:41,651 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 584 SyntacticMatches, 1 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5780 ImplicationChecksByTransitivity, 23.9s TimeCoverageRelationStatistics Valid=1553, Invalid=14703, Unknown=0, NotChecked=0, Total=16256 [2021-11-23 16:56:41,651 INFO L933 BasicCegarLoop]: 1535 mSDtfsCounter, 2362 mSDsluCounter, 64120 mSDsCounter, 0 mSdLazyCounter, 564 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2362 SdHoareTripleChecker+Valid, 65655 SdHoareTripleChecker+Invalid, 1256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 669 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:41,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2362 Valid, 65655 Invalid, 1256 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [23 Valid, 564 Invalid, 0 Unknown, 669 Unchecked, 1.0s Time] [2021-11-23 16:56:41,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21991 states. [2021-11-23 16:56:43,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21991 to 21381. [2021-11-23 16:56:43,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21381 states, 21379 states have (on average 1.2472052013658264) internal successors, (26664), 21380 states have internal predecessors, (26664), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:43,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21381 states to 21381 states and 26664 transitions. [2021-11-23 16:56:43,649 INFO L78 Accepts]: Start accepts. Automaton has 21381 states and 26664 transitions. Word has length 113 [2021-11-23 16:56:43,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:43,649 INFO L470 AbstractCegarLoop]: Abstraction has 21381 states and 26664 transitions. [2021-11-23 16:56:43,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 4.730769230769231) internal successors, (492), 104 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:43,649 INFO L276 IsEmpty]: Start isEmpty. Operand 21381 states and 26664 transitions. [2021-11-23 16:56:43,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 16:56:43,651 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:43,651 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:43,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:43,877 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Ended with exit code 0 [2021-11-23 16:56:44,062 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Ended with exit code 0 [2021-11-23 16:56:44,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:56:44,253 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:44,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:44,253 INFO L85 PathProgramCache]: Analyzing trace with hash 1781048702, now seen corresponding path program 1 times [2021-11-23 16:56:44,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:44,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1068472264] [2021-11-23 16:56:44,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:44,254 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:44,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:44,256 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:44,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Waiting until timeout for monitored process [2021-11-23 16:56:44,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:44,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:56:44,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:50,120 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:50,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:52,880 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:52,880 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:52,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1068472264] [2021-11-23 16:56:52,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1068472264] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:52,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [402752428] [2021-11-23 16:56:52,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:52,881 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:52,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:56:52,882 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:56:52,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (111)] Waiting until timeout for monitored process [2021-11-23 16:56:53,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:53,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:56:53,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:59,558 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:59,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:00,582 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:00,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [402752428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:00,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [566442985] [2021-11-23 16:57:00,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:00,582 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:00,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:57:00,583 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:57:00,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-23 16:57:00,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:00,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:57:00,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:06,025 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:06,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:07,124 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:07,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [566442985] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:07,124 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:57:07,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19, 18, 18, 17] total 51 [2021-11-23 16:57:07,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682878717] [2021-11-23 16:57:07,125 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:57:07,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 16:57:07,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:07,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 16:57:07,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2336, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 16:57:07,127 INFO L87 Difference]: Start difference. First operand 21381 states and 26664 transitions. Second operand has 51 states, 51 states have (on average 5.784313725490196) internal successors, (295), 51 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:09,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:09,723 INFO L93 Difference]: Finished difference Result 28338 states and 35401 transitions. [2021-11-23 16:57:09,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 16:57:09,723 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 5.784313725490196) internal successors, (295), 51 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-23 16:57:09,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:09,751 INFO L225 Difference]: With dead ends: 28338 [2021-11-23 16:57:09,751 INFO L226 Difference]: Without dead ends: 21561 [2021-11-23 16:57:09,762 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 629 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 911 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=244, Invalid=2512, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 16:57:09,763 INFO L933 BasicCegarLoop]: 1559 mSDtfsCounter, 3033 mSDsluCounter, 33867 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3033 SdHoareTripleChecker+Valid, 35426 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 256 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:09,763 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3033 Valid, 35426 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 162 Invalid, 0 Unknown, 256 Unchecked, 0.3s Time] [2021-11-23 16:57:09,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21561 states. [2021-11-23 16:57:11,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21561 to 21371. [2021-11-23 16:57:11,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21371 states, 21369 states have (on average 1.2472272918714025) internal successors, (26652), 21370 states have internal predecessors, (26652), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:11,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21371 states to 21371 states and 26652 transitions. [2021-11-23 16:57:11,960 INFO L78 Accepts]: Start accepts. Automaton has 21371 states and 26652 transitions. Word has length 114 [2021-11-23 16:57:11,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:11,960 INFO L470 AbstractCegarLoop]: Abstraction has 21371 states and 26652 transitions. [2021-11-23 16:57:11,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 5.784313725490196) internal successors, (295), 51 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:11,961 INFO L276 IsEmpty]: Start isEmpty. Operand 21371 states and 26652 transitions. [2021-11-23 16:57:11,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 16:57:11,964 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:11,964 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:11,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:12,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (111)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:12,406 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Ended with exit code 0 [2021-11-23 16:57:12,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:12,580 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:12,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:12,581 INFO L85 PathProgramCache]: Analyzing trace with hash 807167624, now seen corresponding path program 1 times [2021-11-23 16:57:12,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:12,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1525830980] [2021-11-23 16:57:12,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:12,581 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:12,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:12,582 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:12,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Waiting until timeout for monitored process [2021-11-23 16:57:12,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:12,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:57:12,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:17,644 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 31 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:17,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:19,185 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 31 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:19,185 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:19,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1525830980] [2021-11-23 16:57:19,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1525830980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:19,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1871823845] [2021-11-23 16:57:19,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:19,186 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:19,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:57:19,187 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:57:19,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Waiting until timeout for monitored process [2021-11-23 16:57:19,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:19,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:57:19,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:24,363 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 31 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:24,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:28,232 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:28,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1871823845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:28,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [761981829] [2021-11-23 16:57:28,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:28,232 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:28,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:57:28,233 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:57:28,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-23 16:57:28,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:28,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:57:28,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:39,149 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:39,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:42,526 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:42,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [761981829] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:42,527 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:57:42,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17, 21, 22, 24, 18] total 98 [2021-11-23 16:57:42,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345781210] [2021-11-23 16:57:42,527 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:57:42,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-23 16:57:42,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:42,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-23 16:57:42,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=704, Invalid=8802, Unknown=0, NotChecked=0, Total=9506 [2021-11-23 16:57:42,530 INFO L87 Difference]: Start difference. First operand 21371 states and 26652 transitions. Second operand has 98 states, 98 states have (on average 5.336734693877551) internal successors, (523), 98 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:50,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:50,990 INFO L93 Difference]: Finished difference Result 28948 states and 36003 transitions. [2021-11-23 16:57:50,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 16:57:50,991 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 5.336734693877551) internal successors, (523), 98 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-23 16:57:50,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:51,021 INFO L225 Difference]: With dead ends: 28948 [2021-11-23 16:57:51,021 INFO L226 Difference]: Without dead ends: 24062 [2021-11-23 16:57:51,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 591 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4739 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=1037, Invalid=12303, Unknown=0, NotChecked=0, Total=13340 [2021-11-23 16:57:51,029 INFO L933 BasicCegarLoop]: 1602 mSDtfsCounter, 34934 mSDsluCounter, 46806 mSDsCounter, 0 mSdLazyCounter, 761 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34934 SdHoareTripleChecker+Valid, 48408 SdHoareTripleChecker+Invalid, 1138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 761 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 338 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:51,030 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34934 Valid, 48408 Invalid, 1138 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [39 Valid, 761 Invalid, 0 Unknown, 338 Unchecked, 1.4s Time] [2021-11-23 16:57:51,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24062 states. [2021-11-23 16:57:53,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24062 to 21320. [2021-11-23 16:57:53,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21320 states, 21318 states have (on average 1.247490383713294) internal successors, (26594), 21319 states have internal predecessors, (26594), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:53,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21320 states to 21320 states and 26594 transitions. [2021-11-23 16:57:53,234 INFO L78 Accepts]: Start accepts. Automaton has 21320 states and 26594 transitions. Word has length 114 [2021-11-23 16:57:53,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:53,235 INFO L470 AbstractCegarLoop]: Abstraction has 21320 states and 26594 transitions. [2021-11-23 16:57:53,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 5.336734693877551) internal successors, (523), 98 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:57:53,235 INFO L276 IsEmpty]: Start isEmpty. Operand 21320 states and 26594 transitions. [2021-11-23 16:57:53,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 16:57:53,237 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:53,237 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:57:53,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:53,463 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2021-11-23 16:57:53,640 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Ended with exit code 0 [2021-11-23 16:57:53,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:53,839 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:53,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:53,839 INFO L85 PathProgramCache]: Analyzing trace with hash -1838564418, now seen corresponding path program 1 times [2021-11-23 16:57:53,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:53,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1205674396] [2021-11-23 16:57:53,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:53,840 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:53,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:53,841 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:53,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (116)] Waiting until timeout for monitored process [2021-11-23 16:57:53,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:53,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:57:53,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:59,092 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:59,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:00,555 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:00,556 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:00,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1205674396] [2021-11-23 16:58:00,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1205674396] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:00,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1370375712] [2021-11-23 16:58:00,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:00,556 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:00,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:58:00,557 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:58:00,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (117)] Waiting until timeout for monitored process [2021-11-23 16:58:00,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:00,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 16:58:00,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:10,727 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:10,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:19,352 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:19,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1370375712] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:19,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1524013898] [2021-11-23 16:58:19,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:19,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:19,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:58:19,354 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:58:19,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-23 16:58:19,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:19,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 16:58:19,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:25,044 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 40 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:25,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:27,009 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:27,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1524013898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:27,009 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:58:27,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17, 31, 32, 31, 32] total 90 [2021-11-23 16:58:27,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109050833] [2021-11-23 16:58:27,010 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:58:27,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2021-11-23 16:58:27,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:27,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-11-23 16:58:27,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=634, Invalid=7376, Unknown=0, NotChecked=0, Total=8010 [2021-11-23 16:58:27,012 INFO L87 Difference]: Start difference. First operand 21320 states and 26594 transitions. Second operand has 90 states, 90 states have (on average 4.2555555555555555) internal successors, (383), 90 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:34,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:34,533 INFO L93 Difference]: Finished difference Result 26805 states and 33297 transitions. [2021-11-23 16:58:34,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-23 16:58:34,534 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 4.2555555555555555) internal successors, (383), 90 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-23 16:58:34,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:34,564 INFO L225 Difference]: With dead ends: 26805 [2021-11-23 16:58:34,564 INFO L226 Difference]: Without dead ends: 24010 [2021-11-23 16:58:34,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 692 GetRequests, 591 SyntacticMatches, 5 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3812 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=782, Invalid=8724, Unknown=0, NotChecked=0, Total=9506 [2021-11-23 16:58:34,572 INFO L933 BasicCegarLoop]: 1561 mSDtfsCounter, 20647 mSDsluCounter, 50093 mSDsCounter, 0 mSdLazyCounter, 1194 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20647 SdHoareTripleChecker+Valid, 51654 SdHoareTripleChecker+Invalid, 1721 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 1194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 505 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:34,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20647 Valid, 51654 Invalid, 1721 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [22 Valid, 1194 Invalid, 0 Unknown, 505 Unchecked, 2.4s Time] [2021-11-23 16:58:34,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24010 states. [2021-11-23 16:58:36,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24010 to 21345. [2021-11-23 16:58:36,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21345 states, 21343 states have (on average 1.2472473410485874) internal successors, (26620), 21344 states have internal predecessors, (26620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:36,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21345 states to 21345 states and 26620 transitions. [2021-11-23 16:58:36,917 INFO L78 Accepts]: Start accepts. Automaton has 21345 states and 26620 transitions. Word has length 114 [2021-11-23 16:58:36,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:36,917 INFO L470 AbstractCegarLoop]: Abstraction has 21345 states and 26620 transitions. [2021-11-23 16:58:36,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 90 states have (on average 4.2555555555555555) internal successors, (383), 90 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:36,918 INFO L276 IsEmpty]: Start isEmpty. Operand 21345 states and 26620 transitions. [2021-11-23 16:58:36,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 16:58:36,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:36,921 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:36,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (116)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:37,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:37,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (117)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:37,537 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:37,538 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:37,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:37,538 INFO L85 PathProgramCache]: Analyzing trace with hash 1507123655, now seen corresponding path program 1 times [2021-11-23 16:58:37,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:37,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [260778059] [2021-11-23 16:58:37,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:37,539 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:37,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:37,540 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:37,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_74f50cf5-1240-42e8-8f0f-694546468659/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (119)] Waiting until timeout for monitored process [2021-11-23 16:58:37,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:37,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 16:58:37,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:42,924 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 35 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:42,924 INFO L328 TraceCheckSpWp]: Computing backward predicates...