./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.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_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/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_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/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_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/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 850d02aa9cb18294f9975f6e4e447a197934bcfd77c20fda5c55e9f9e3e0a979 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:29:56,015 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:29:56,018 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:29:56,050 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:29:56,051 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:29:56,052 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:29:56,054 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:29:56,057 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:29:56,059 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:29:56,061 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:29:56,062 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:29:56,064 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:29:56,064 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:29:56,066 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:29:56,068 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:29:56,070 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:29:56,071 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:29:56,072 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:29:56,075 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:29:56,077 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:29:56,079 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:29:56,081 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:29:56,083 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:29:56,084 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:29:56,088 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:29:56,089 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:29:56,089 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:29:56,090 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:29:56,091 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:29:56,092 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:29:56,093 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:29:56,094 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:29:56,095 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:29:56,096 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:29:56,098 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:29:56,099 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:29:56,100 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:29:56,100 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:29:56,101 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:29:56,102 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:29:56,103 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:29:56,104 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:29:56,143 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:29:56,143 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:29:56,144 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:29:56,144 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:29:56,145 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:29:56,145 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:29:56,145 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:29:56,146 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:29:56,146 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:29:56,146 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:29:56,146 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:29:56,147 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:29:56,147 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:29:56,147 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:29:56,147 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:29:56,148 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:29:56,148 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:29:56,148 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:29:56,149 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:29:56,149 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:29:56,150 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:29:56,150 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:29:56,157 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:29:56,157 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:29:56,158 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:29:56,158 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:29:56,159 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:29:56,160 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:29:56,161 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:29:56,161 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:29:56,161 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:29:56,162 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:29:56,162 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:29:56,162 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:29:56,163 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:29:56,163 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:29:56,164 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:29:56,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:29:56,165 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:29:56,165 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:29:56,165 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:29:56,165 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_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 850d02aa9cb18294f9975f6e4e447a197934bcfd77c20fda5c55e9f9e3e0a979 [2021-11-23 17:29:56,480 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:29:56,518 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:29:56,520 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:29:56,522 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:29:56,523 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:29:56,524 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c [2021-11-23 17:29:56,605 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/data/b3bf86d6a/72a52f69b38c4c12b7b6a375a1f9fa73/FLAGa2c833d2f [2021-11-23 17:29:57,107 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:29:57,108 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c [2021-11-23 17:29:57,116 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/data/b3bf86d6a/72a52f69b38c4c12b7b6a375a1f9fa73/FLAGa2c833d2f [2021-11-23 17:29:57,441 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/data/b3bf86d6a/72a52f69b38c4c12b7b6a375a1f9fa73 [2021-11-23 17:29:57,443 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:29:57,445 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:29:57,447 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:29:57,447 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:29:57,451 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:29:57,452 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:57,453 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@245152f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57, skipping insertion in model container [2021-11-23 17:29:57,453 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:57,461 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:29:57,490 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:29:57,764 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_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c[6787,6800] [2021-11-23 17:29:57,774 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:29:57,790 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:29:57,865 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_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c[6787,6800] [2021-11-23 17:29:57,874 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:29:57,888 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:29:57,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57 WrapperNode [2021-11-23 17:29:57,891 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:29:57,892 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:29:57,892 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:29:57,893 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:29:57,900 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:57,921 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:57,965 INFO L137 Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 246 [2021-11-23 17:29:57,965 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:29:57,966 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:29:57,966 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:29:57,966 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:29:57,978 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:57,978 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:57,990 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:57,991 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:57,997 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:58,003 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:58,005 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:58,008 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:29:58,013 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:29:58,026 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:29:58,026 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:29:58,027 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:29:57" (1/1) ... [2021-11-23 17:29:58,037 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:29:58,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:58,056 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:29:58,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:29:58,095 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:29:58,096 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:29:58,096 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:29:58,096 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:29:58,176 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:29:58,177 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:29:58,511 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:29:58,557 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:29:58,562 INFO L158 Benchmark]: Toolchain (without parser) took 1116.28ms. Allocated memory is still 130.0MB. Free memory was 98.6MB in the beginning and 76.3MB in the end (delta: 22.3MB). Peak memory consumption was 20.3MB. Max. memory is 16.1GB. [2021-11-23 17:29:58,578 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 130.0MB. Free memory is still 82.2MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:29:58,579 INFO L158 Benchmark]: CACSL2BoogieTranslator took 444.37ms. Allocated memory is still 130.0MB. Free memory was 98.1MB in the beginning and 100.4MB in the end (delta: -2.2MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-23 17:29:58,580 INFO L158 Benchmark]: Boogie Procedure Inliner took 73.06ms. Allocated memory is still 130.0MB. Free memory was 99.9MB in the beginning and 97.7MB in the end (delta: 2.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:29:58,581 INFO L158 Benchmark]: Boogie Preprocessor took 42.59ms. Allocated memory is still 130.0MB. Free memory was 97.7MB in the beginning and 96.2MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:29:58,582 INFO L158 Benchmark]: RCFGBuilder took 547.12ms. Allocated memory is still 130.0MB. Free memory was 96.2MB in the beginning and 76.8MB in the end (delta: 19.4MB). Peak memory consumption was 18.9MB. Max. memory is 16.1GB. [2021-11-23 17:29:58,586 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 130.0MB. Free memory is still 82.2MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 444.37ms. Allocated memory is still 130.0MB. Free memory was 98.1MB in the beginning and 100.4MB in the end (delta: -2.2MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 73.06ms. Allocated memory is still 130.0MB. Free memory was 99.9MB in the beginning and 97.7MB in the end (delta: 2.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 42.59ms. Allocated memory is still 130.0MB. Free memory was 97.7MB in the beginning and 96.2MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 547.12ms. Allocated memory is still 130.0MB. Free memory was 96.2MB in the beginning and 76.8MB in the end (delta: 19.4MB). Peak memory consumption was 18.9MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:29:58,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/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_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/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_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/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 850d02aa9cb18294f9975f6e4e447a197934bcfd77c20fda5c55e9f9e3e0a979 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:30:01,180 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:30:01,183 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:30:01,242 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:30:01,243 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:30:01,249 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:30:01,251 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:30:01,256 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:30:01,260 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:30:01,270 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:30:01,272 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:30:01,274 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:30:01,275 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:30:01,277 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:30:01,280 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:30:01,286 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:30:01,288 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:30:01,290 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:30:01,292 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:30:01,300 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:30:01,303 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:30:01,304 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:30:01,307 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:30:01,309 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:30:01,314 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:30:01,315 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:30:01,315 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:30:01,317 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:30:01,318 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:30:01,319 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:30:01,320 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:30:01,321 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:30:01,323 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:30:01,324 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:30:01,325 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:30:01,326 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:30:01,327 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:30:01,327 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:30:01,327 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:30:01,329 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:30:01,330 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:30:01,336 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:30:01,379 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:30:01,379 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:30:01,380 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:30:01,380 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:30:01,381 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:30:01,381 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:30:01,381 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:30:01,382 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:30:01,382 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:30:01,382 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:30:01,382 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:30:01,383 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:30:01,384 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:30:01,384 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:30:01,384 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:30:01,384 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:30:01,385 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:30:01,385 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:30:01,385 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:30:01,385 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:30:01,386 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:30:01,386 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:30:01,386 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:30:01,386 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:30:01,387 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:30:01,387 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:30:01,387 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:30:01,387 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:30:01,388 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:30:01,388 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:30:01,388 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:30:01,388 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:30:01,389 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:30:01,389 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:30:01,389 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:01,389 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:30:01,390 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:30:01,390 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:30:01,390 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_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 850d02aa9cb18294f9975f6e4e447a197934bcfd77c20fda5c55e9f9e3e0a979 [2021-11-23 17:30:01,800 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:30:01,831 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:30:01,834 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:30:01,835 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:30:01,836 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:30:01,838 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c [2021-11-23 17:30:01,912 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/data/e7a86f842/5096b774a0c84a8e8a135431250e1b98/FLAG698c72203 [2021-11-23 17:30:02,537 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:30:02,537 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c [2021-11-23 17:30:02,550 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/data/e7a86f842/5096b774a0c84a8e8a135431250e1b98/FLAG698c72203 [2021-11-23 17:30:02,846 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/data/e7a86f842/5096b774a0c84a8e8a135431250e1b98 [2021-11-23 17:30:02,848 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:30:02,851 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:30:02,854 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:30:02,854 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:30:02,858 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:30:02,859 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:30:02" (1/1) ... [2021-11-23 17:30:02,861 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4264eb8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:02, skipping insertion in model container [2021-11-23 17:30:02,861 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:30:02" (1/1) ... [2021-11-23 17:30:02,869 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:30:02,906 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:30:03,193 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_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c[6787,6800] [2021-11-23 17:30:03,198 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:30:03,223 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:30:03,305 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_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c[6787,6800] [2021-11-23 17:30:03,321 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:30:03,337 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:30:03,339 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03 WrapperNode [2021-11-23 17:30:03,340 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:30:03,342 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:30:03,342 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:30:03,342 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:30:03,349 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03" (1/1) ... [2021-11-23 17:30:03,375 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03" (1/1) ... [2021-11-23 17:30:03,418 INFO L137 Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 235 [2021-11-23 17:30:03,419 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:30:03,420 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:30:03,420 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:30:03,421 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:30:03,430 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03" (1/1) ... [2021-11-23 17:30:03,430 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03" (1/1) ... [2021-11-23 17:30:03,445 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03" (1/1) ... [2021-11-23 17:30:03,449 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03" (1/1) ... [2021-11-23 17:30:03,457 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03" (1/1) ... [2021-11-23 17:30:03,478 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03" (1/1) ... [2021-11-23 17:30:03,484 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03" (1/1) ... [2021-11-23 17:30:03,487 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:30:03,488 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:30:03,489 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:30:03,489 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:30:03,490 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03" (1/1) ... [2021-11-23 17:30:03,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:30:03,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:03,527 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:30:03,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:30:03,576 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:30:03,576 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:30:03,576 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:30:03,577 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:30:03,704 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:30:03,705 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:30:04,203 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:30:04,210 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:30:04,210 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:30:04,212 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:30:04 BoogieIcfgContainer [2021-11-23 17:30:04,213 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:30:04,215 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:30:04,215 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:30:04,218 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:30:04,218 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:30:02" (1/3) ... [2021-11-23 17:30:04,219 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37ab01b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:30:04, skipping insertion in model container [2021-11-23 17:30:04,219 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:30:03" (2/3) ... [2021-11-23 17:30:04,220 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37ab01b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:30:04, skipping insertion in model container [2021-11-23 17:30:04,220 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:30:04" (3/3) ... [2021-11-23 17:30:04,221 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr-var-start-time.3.2.ufo.UNBOUNDED.pals.c [2021-11-23 17:30:04,227 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:30:04,227 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:30:04,275 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:30:04,283 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 17:30:04,283 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:30:04,299 INFO L276 IsEmpty]: Start isEmpty. Operand has 78 states, 76 states have (on average 1.6710526315789473) internal successors, (127), 77 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:04,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 17:30:04,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:04,308 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] [2021-11-23 17:30:04,308 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:04,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:04,314 INFO L85 PathProgramCache]: Analyzing trace with hash -430581620, now seen corresponding path program 1 times [2021-11-23 17:30:04,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:04,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [715333450] [2021-11-23 17:30:04,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:04,328 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:04,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:04,332 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:04,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:30:04,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:04,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:30:04,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:04,672 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:04,672 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:04,673 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:04,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [715333450] [2021-11-23 17:30:04,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [715333450] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:04,674 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:04,674 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:04,676 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427869945] [2021-11-23 17:30:04,677 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:04,681 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:30:04,682 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:04,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:30:04,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:30:04,713 INFO L87 Difference]: Start difference. First operand has 78 states, 76 states have (on average 1.6710526315789473) internal successors, (127), 77 states have internal predecessors, (127), 0 states have call successors, (0), 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 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:04,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:04,813 INFO L93 Difference]: Finished difference Result 133 states and 215 transitions. [2021-11-23 17:30:04,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:30:04,816 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 0 states have call successors, (0), 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 25 [2021-11-23 17:30:04,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:04,825 INFO L225 Difference]: With dead ends: 133 [2021-11-23 17:30:04,826 INFO L226 Difference]: Without dead ends: 74 [2021-11-23 17:30:04,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:30:04,832 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 3 mSDsluCounter, 334 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 452 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:04,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 452 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:04,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-23 17:30:04,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-11-23 17:30:04,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.4109589041095891) internal successors, (103), 73 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 17:30:04,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 103 transitions. [2021-11-23 17:30:04,873 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 103 transitions. Word has length 25 [2021-11-23 17:30:04,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:04,873 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 103 transitions. [2021-11-23 17:30:04,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:04,882 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 103 transitions. [2021-11-23 17:30:04,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 17:30:04,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:04,885 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 17:30:04,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:05,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:05,096 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:05,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:05,097 INFO L85 PathProgramCache]: Analyzing trace with hash -482254910, now seen corresponding path program 1 times [2021-11-23 17:30:05,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:05,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1726784490] [2021-11-23 17:30:05,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:05,099 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:05,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:05,115 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:05,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:30:05,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:05,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:30:05,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:05,465 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:05,466 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:05,466 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:05,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1726784490] [2021-11-23 17:30:05,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1726784490] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:05,467 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:05,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:30:05,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697165893] [2021-11-23 17:30:05,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:05,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:05,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:05,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:05,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:05,481 INFO L87 Difference]: Start difference. First operand 74 states and 103 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 17:30:05,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:05,531 INFO L93 Difference]: Finished difference Result 164 states and 243 transitions. [2021-11-23 17:30:05,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:05,532 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 17:30:05,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:05,537 INFO L225 Difference]: With dead ends: 164 [2021-11-23 17:30:05,538 INFO L226 Difference]: Without dead ends: 113 [2021-11-23 17:30:05,539 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 17:30:05,540 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 64 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 213 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 17:30:05,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 213 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:05,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-23 17:30:05,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 111. [2021-11-23 17:30:05,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.4636363636363636) internal successors, (161), 110 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 17:30:05,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 161 transitions. [2021-11-23 17:30:05,570 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 161 transitions. Word has length 41 [2021-11-23 17:30:05,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:05,572 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 161 transitions. [2021-11-23 17:30:05,573 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 17:30:05,573 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 161 transitions. [2021-11-23 17:30:05,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 17:30:05,577 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:05,577 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] [2021-11-23 17:30:05,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:05,788 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:05,789 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:05,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:05,790 INFO L85 PathProgramCache]: Analyzing trace with hash 2033327635, now seen corresponding path program 1 times [2021-11-23 17:30:05,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:05,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [718487522] [2021-11-23 17:30:05,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:05,791 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:05,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:05,793 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:05,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:30:05,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:05,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:30:05,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:06,039 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:06,039 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:06,039 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:06,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [718487522] [2021-11-23 17:30:06,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [718487522] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:06,043 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:06,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:30:06,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621122183] [2021-11-23 17:30:06,044 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:06,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:06,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:06,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:06,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:06,050 INFO L87 Difference]: Start difference. First operand 111 states and 161 transitions. Second operand has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:06,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:06,097 INFO L93 Difference]: Finished difference Result 263 states and 397 transitions. [2021-11-23 17:30:06,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:06,098 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 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 42 [2021-11-23 17:30:06,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:06,101 INFO L225 Difference]: With dead ends: 263 [2021-11-23 17:30:06,103 INFO L226 Difference]: Without dead ends: 175 [2021-11-23 17:30:06,104 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:06,105 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 59 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 204 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 17:30:06,107 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 204 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:06,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-11-23 17:30:06,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 173. [2021-11-23 17:30:06,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.4883720930232558) internal successors, (256), 172 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:06,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 256 transitions. [2021-11-23 17:30:06,136 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 256 transitions. Word has length 42 [2021-11-23 17:30:06,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:06,137 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 256 transitions. [2021-11-23 17:30:06,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:06,137 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 256 transitions. [2021-11-23 17:30:06,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 17:30:06,139 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:06,139 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 17:30:06,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:06,350 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:06,351 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:06,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:06,352 INFO L85 PathProgramCache]: Analyzing trace with hash -1819327886, now seen corresponding path program 1 times [2021-11-23 17:30:06,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:06,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [454885619] [2021-11-23 17:30:06,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:06,352 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:06,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:06,354 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:06,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:30:06,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:06,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:30:06,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:06,610 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:06,610 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:06,610 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:06,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [454885619] [2021-11-23 17:30:06,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [454885619] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:06,611 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:06,611 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:06,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949221142] [2021-11-23 17:30:06,612 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:06,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:30:06,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:06,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:30:06,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:30:06,614 INFO L87 Difference]: Start difference. First operand 173 states and 256 transitions. Second operand has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 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 17:30:06,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:06,739 INFO L93 Difference]: Finished difference Result 587 states and 893 transitions. [2021-11-23 17:30:06,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:30:06,751 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 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 17:30:06,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:06,755 INFO L225 Difference]: With dead ends: 587 [2021-11-23 17:30:06,758 INFO L226 Difference]: Without dead ends: 437 [2021-11-23 17:30:06,760 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 39 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 17:30:06,762 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 192 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:06,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 343 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:30:06,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2021-11-23 17:30:06,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 433. [2021-11-23 17:30:06,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 432 states have (on average 1.5138888888888888) internal successors, (654), 432 states have internal predecessors, (654), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:06,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 654 transitions. [2021-11-23 17:30:06,823 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 654 transitions. Word has length 43 [2021-11-23 17:30:06,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:06,823 INFO L470 AbstractCegarLoop]: Abstraction has 433 states and 654 transitions. [2021-11-23 17:30:06,824 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 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 17:30:06,824 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 654 transitions. [2021-11-23 17:30:06,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 17:30:06,833 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:06,834 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 17:30:06,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:07,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:07,045 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:07,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:07,046 INFO L85 PathProgramCache]: Analyzing trace with hash 106320216, now seen corresponding path program 1 times [2021-11-23 17:30:07,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:07,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1927088040] [2021-11-23 17:30:07,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:07,047 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:07,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:07,053 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:07,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:30:07,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:07,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:30:07,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:07,537 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:07,538 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:07,538 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:07,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1927088040] [2021-11-23 17:30:07,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1927088040] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:07,539 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:07,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:07,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893697509] [2021-11-23 17:30:07,539 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:07,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:30:07,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:07,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:30:07,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:30:07,541 INFO L87 Difference]: Start difference. First operand 433 states and 654 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 17:30:07,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:07,668 INFO L93 Difference]: Finished difference Result 1675 states and 2562 transitions. [2021-11-23 17:30:07,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:30:07,669 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 17:30:07,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:07,678 INFO L225 Difference]: With dead ends: 1675 [2021-11-23 17:30:07,678 INFO L226 Difference]: Without dead ends: 1265 [2021-11-23 17:30:07,680 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 40 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 17:30:07,681 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 277 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:07,681 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [277 Valid, 469 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:30:07,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1265 states. [2021-11-23 17:30:07,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1265 to 841. [2021-11-23 17:30:07,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 841 states, 840 states have (on average 1.5) internal successors, (1260), 840 states have internal predecessors, (1260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:07,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 841 states to 841 states and 1260 transitions. [2021-11-23 17:30:07,756 INFO L78 Accepts]: Start accepts. Automaton has 841 states and 1260 transitions. Word has length 44 [2021-11-23 17:30:07,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:07,757 INFO L470 AbstractCegarLoop]: Abstraction has 841 states and 1260 transitions. [2021-11-23 17:30:07,758 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 17:30:07,758 INFO L276 IsEmpty]: Start isEmpty. Operand 841 states and 1260 transitions. [2021-11-23 17:30:07,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 17:30:07,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:07,762 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] [2021-11-23 17:30:07,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:07,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:07,973 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:07,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:07,973 INFO L85 PathProgramCache]: Analyzing trace with hash -1382364025, now seen corresponding path program 1 times [2021-11-23 17:30:07,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:07,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [255840904] [2021-11-23 17:30:07,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:07,974 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:07,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:07,975 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:07,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:30:08,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:08,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:30:08,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:08,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:08,136 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:08,136 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:08,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [255840904] [2021-11-23 17:30:08,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [255840904] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:08,137 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:08,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:08,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966621196] [2021-11-23 17:30:08,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:08,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:30:08,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:08,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:30:08,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:30:08,139 INFO L87 Difference]: Start difference. First operand 841 states and 1260 transitions. Second operand has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:08,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:08,295 INFO L93 Difference]: Finished difference Result 1755 states and 2593 transitions. [2021-11-23 17:30:08,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:30:08,296 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 0 states have call successors, (0), 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 45 [2021-11-23 17:30:08,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:08,308 INFO L225 Difference]: With dead ends: 1755 [2021-11-23 17:30:08,308 INFO L226 Difference]: Without dead ends: 1753 [2021-11-23 17:30:08,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:30:08,313 INFO L933 BasicCegarLoop]: 154 mSDtfsCounter, 219 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:08,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 459 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:08,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1753 states. [2021-11-23 17:30:08,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1753 to 913. [2021-11-23 17:30:08,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 913 states, 912 states have (on average 1.4605263157894737) internal successors, (1332), 912 states have internal predecessors, (1332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:08,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 913 states to 913 states and 1332 transitions. [2021-11-23 17:30:08,396 INFO L78 Accepts]: Start accepts. Automaton has 913 states and 1332 transitions. Word has length 45 [2021-11-23 17:30:08,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:08,398 INFO L470 AbstractCegarLoop]: Abstraction has 913 states and 1332 transitions. [2021-11-23 17:30:08,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:08,399 INFO L276 IsEmpty]: Start isEmpty. Operand 913 states and 1332 transitions. [2021-11-23 17:30:08,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 17:30:08,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:08,401 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] [2021-11-23 17:30:08,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:08,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:08,614 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:08,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:08,615 INFO L85 PathProgramCache]: Analyzing trace with hash 148966672, now seen corresponding path program 1 times [2021-11-23 17:30:08,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:08,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [195110937] [2021-11-23 17:30:08,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:08,616 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:08,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:08,617 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:08,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:30:08,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:08,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:30:08,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:08,812 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:08,812 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:08,813 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:08,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [195110937] [2021-11-23 17:30:08,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [195110937] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:08,813 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:08,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:30:08,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444561786] [2021-11-23 17:30:08,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:08,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:08,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:08,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:08,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:08,816 INFO L87 Difference]: Start difference. First operand 913 states and 1332 transitions. Second operand has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:08,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:08,921 INFO L93 Difference]: Finished difference Result 2393 states and 3478 transitions. [2021-11-23 17:30:08,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:08,921 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 0 states have call successors, (0), 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 46 [2021-11-23 17:30:08,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:08,932 INFO L225 Difference]: With dead ends: 2393 [2021-11-23 17:30:08,933 INFO L226 Difference]: Without dead ends: 1503 [2021-11-23 17:30:08,934 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:08,936 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 49 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 178 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 17:30:08,936 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 178 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:08,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1503 states. [2021-11-23 17:30:09,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1503 to 1481. [2021-11-23 17:30:09,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1481 states, 1480 states have (on average 1.4243243243243244) internal successors, (2108), 1480 states have internal predecessors, (2108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:09,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1481 states to 1481 states and 2108 transitions. [2021-11-23 17:30:09,048 INFO L78 Accepts]: Start accepts. Automaton has 1481 states and 2108 transitions. Word has length 46 [2021-11-23 17:30:09,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:09,048 INFO L470 AbstractCegarLoop]: Abstraction has 1481 states and 2108 transitions. [2021-11-23 17:30:09,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:09,049 INFO L276 IsEmpty]: Start isEmpty. Operand 1481 states and 2108 transitions. [2021-11-23 17:30:09,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 17:30:09,050 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:09,050 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:09,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:09,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:09,268 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:09,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:09,269 INFO L85 PathProgramCache]: Analyzing trace with hash -1623386325, now seen corresponding path program 1 times [2021-11-23 17:30:09,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:09,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [294952216] [2021-11-23 17:30:09,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:09,270 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:09,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:09,271 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:09,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:30:09,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:09,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:30:09,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:09,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:09,420 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:09,420 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:09,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [294952216] [2021-11-23 17:30:09,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [294952216] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:09,421 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:09,421 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:30:09,421 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493022332] [2021-11-23 17:30:09,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:09,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:09,422 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:09,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:09,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:09,423 INFO L87 Difference]: Start difference. First operand 1481 states and 2108 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:09,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:09,570 INFO L93 Difference]: Finished difference Result 3000 states and 4298 transitions. [2021-11-23 17:30:09,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:09,571 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-23 17:30:09,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:09,585 INFO L225 Difference]: With dead ends: 3000 [2021-11-23 17:30:09,585 INFO L226 Difference]: Without dead ends: 2109 [2021-11-23 17:30:09,587 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:09,588 INFO L933 BasicCegarLoop]: 158 mSDtfsCounter, 65 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 234 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 17:30:09,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 234 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:09,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2109 states. [2021-11-23 17:30:09,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2109 to 2107. [2021-11-23 17:30:09,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2107 states, 2106 states have (on average 1.4064577397910731) internal successors, (2962), 2106 states have internal predecessors, (2962), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:09,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2107 states to 2107 states and 2962 transitions. [2021-11-23 17:30:09,755 INFO L78 Accepts]: Start accepts. Automaton has 2107 states and 2962 transitions. Word has length 47 [2021-11-23 17:30:09,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:09,755 INFO L470 AbstractCegarLoop]: Abstraction has 2107 states and 2962 transitions. [2021-11-23 17:30:09,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:09,756 INFO L276 IsEmpty]: Start isEmpty. Operand 2107 states and 2962 transitions. [2021-11-23 17:30:09,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:30:09,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:09,758 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] [2021-11-23 17:30:09,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:09,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:09,978 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:09,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:09,979 INFO L85 PathProgramCache]: Analyzing trace with hash 876819086, now seen corresponding path program 1 times [2021-11-23 17:30:09,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:09,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1571907130] [2021-11-23 17:30:09,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:09,980 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:09,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:09,981 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:09,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:30:10,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:10,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:30:10,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:10,164 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 17:30:10,165 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:10,165 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:10,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1571907130] [2021-11-23 17:30:10,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1571907130] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:10,165 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:10,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:30:10,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181774976] [2021-11-23 17:30:10,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:10,166 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:10,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:10,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:10,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:10,168 INFO L87 Difference]: Start difference. First operand 2107 states and 2962 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:10,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:10,301 INFO L93 Difference]: Finished difference Result 3695 states and 5215 transitions. [2021-11-23 17:30:10,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:10,302 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 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 17:30:10,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:10,313 INFO L225 Difference]: With dead ends: 3695 [2021-11-23 17:30:10,313 INFO L226 Difference]: Without dead ends: 1613 [2021-11-23 17:30:10,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:10,317 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 53 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 214 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 17:30:10,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 214 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:10,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1613 states. [2021-11-23 17:30:10,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1613 to 1611. [2021-11-23 17:30:10,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1611 states, 1610 states have (on average 1.3975155279503106) internal successors, (2250), 1610 states have internal predecessors, (2250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:10,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1611 states to 1611 states and 2250 transitions. [2021-11-23 17:30:10,434 INFO L78 Accepts]: Start accepts. Automaton has 1611 states and 2250 transitions. Word has length 66 [2021-11-23 17:30:10,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:10,435 INFO L470 AbstractCegarLoop]: Abstraction has 1611 states and 2250 transitions. [2021-11-23 17:30:10,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:10,435 INFO L276 IsEmpty]: Start isEmpty. Operand 1611 states and 2250 transitions. [2021-11-23 17:30:10,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:30:10,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:10,437 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] [2021-11-23 17:30:10,454 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:10,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:10,649 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:10,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:10,649 INFO L85 PathProgramCache]: Analyzing trace with hash -333777212, now seen corresponding path program 1 times [2021-11-23 17:30:10,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:10,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [887819113] [2021-11-23 17:30:10,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:10,650 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:10,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:10,652 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:10,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:30:10,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:10,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:10,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:12,061 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:12,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:12,588 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:12,589 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:12,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [887819113] [2021-11-23 17:30:12,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [887819113] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:12,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [689089387] [2021-11-23 17:30:12,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:12,590 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:12,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:12,596 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:12,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 17:30:12,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:12,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:12,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:13,744 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:13,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:14,152 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:14,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [689089387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:14,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401380406] [2021-11-23 17:30:14,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:14,153 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:14,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:14,158 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:14,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 17:30:14,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:14,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:14,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:15,171 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:15,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:15,555 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:15,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401380406] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:15,556 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:15,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:30:15,556 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104251157] [2021-11-23 17:30:15,557 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:15,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:30:15,558 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:15,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:30:15,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:30:15,559 INFO L87 Difference]: Start difference. First operand 1611 states and 2250 transitions. Second operand has 16 states, 16 states have (on average 7.8125) internal successors, (125), 15 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:15,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:15,873 INFO L93 Difference]: Finished difference Result 2801 states and 3908 transitions. [2021-11-23 17:30:15,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:30:15,874 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.8125) internal successors, (125), 15 states have internal predecessors, (125), 0 states have call successors, (0), 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 17:30:15,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:15,887 INFO L225 Difference]: With dead ends: 2801 [2021-11-23 17:30:15,887 INFO L226 Difference]: Without dead ends: 1775 [2021-11-23 17:30:15,889 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 382 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:30:15,890 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 130 mSDsluCounter, 738 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 840 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:15,892 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 840 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 67 Invalid, 0 Unknown, 88 Unchecked, 0.1s Time] [2021-11-23 17:30:15,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1775 states. [2021-11-23 17:30:16,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1775 to 1639. [2021-11-23 17:30:16,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1639 states, 1638 states have (on average 1.394993894993895) internal successors, (2285), 1638 states have internal predecessors, (2285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:16,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1639 states to 1639 states and 2285 transitions. [2021-11-23 17:30:16,019 INFO L78 Accepts]: Start accepts. Automaton has 1639 states and 2285 transitions. Word has length 67 [2021-11-23 17:30:16,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:16,019 INFO L470 AbstractCegarLoop]: Abstraction has 1639 states and 2285 transitions. [2021-11-23 17:30:16,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.8125) internal successors, (125), 15 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:16,020 INFO L276 IsEmpty]: Start isEmpty. Operand 1639 states and 2285 transitions. [2021-11-23 17:30:16,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:30:16,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:16,022 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] [2021-11-23 17:30:16,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:16,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:16,449 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:16,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:16,625 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:16,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:16,626 INFO L85 PathProgramCache]: Analyzing trace with hash 325754310, now seen corresponding path program 1 times [2021-11-23 17:30:16,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:16,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1808645206] [2021-11-23 17:30:16,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:16,627 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:16,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:16,628 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:16,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 17:30:16,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:16,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:16,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:17,047 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:30:17,048 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:17,048 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:17,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1808645206] [2021-11-23 17:30:17,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1808645206] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:17,049 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:17,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:17,049 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784693339] [2021-11-23 17:30:17,049 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:17,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:17,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:17,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:17,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:17,051 INFO L87 Difference]: Start difference. First operand 1639 states and 2285 transitions. Second operand has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 5 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:17,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:17,226 INFO L93 Difference]: Finished difference Result 2697 states and 3770 transitions. [2021-11-23 17:30:17,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:30:17,227 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 5 states have internal predecessors, (62), 0 states have call successors, (0), 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 17:30:17,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:17,239 INFO L225 Difference]: With dead ends: 2697 [2021-11-23 17:30:17,239 INFO L226 Difference]: Without dead ends: 1639 [2021-11-23 17:30:17,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:30:17,243 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 21 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:17,244 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 279 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 33 Unchecked, 0.1s Time] [2021-11-23 17:30:17,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1639 states. [2021-11-23 17:30:17,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1639 to 1639. [2021-11-23 17:30:17,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1639 states, 1638 states have (on average 1.3943833943833943) internal successors, (2284), 1638 states have internal predecessors, (2284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:17,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1639 states to 1639 states and 2284 transitions. [2021-11-23 17:30:17,346 INFO L78 Accepts]: Start accepts. Automaton has 1639 states and 2284 transitions. Word has length 67 [2021-11-23 17:30:17,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:17,347 INFO L470 AbstractCegarLoop]: Abstraction has 1639 states and 2284 transitions. [2021-11-23 17:30:17,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 5 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:17,347 INFO L276 IsEmpty]: Start isEmpty. Operand 1639 states and 2284 transitions. [2021-11-23 17:30:17,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:30:17,349 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:17,349 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] [2021-11-23 17:30:17,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:17,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:17,561 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:17,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:17,562 INFO L85 PathProgramCache]: Analyzing trace with hash 1116804446, now seen corresponding path program 1 times [2021-11-23 17:30:17,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:17,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [319338880] [2021-11-23 17:30:17,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:17,564 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:17,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:17,565 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:17,586 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:30:17,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:17,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:17,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:18,470 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:18,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:19,010 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:19,011 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:19,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [319338880] [2021-11-23 17:30:19,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [319338880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:19,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [443334180] [2021-11-23 17:30:19,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:19,012 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:19,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:19,014 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:19,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 17:30:19,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:19,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:19,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:19,758 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:19,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:20,126 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:20,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [443334180] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:20,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021631765] [2021-11-23 17:30:20,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:20,127 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:20,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:20,131 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:20,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 17:30:20,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:20,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:20,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:20,877 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:20,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:21,326 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:21,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021631765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:21,326 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:21,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:30:21,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107380033] [2021-11-23 17:30:21,327 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:21,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:30:21,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:21,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:30:21,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:30:21,329 INFO L87 Difference]: Start difference. First operand 1639 states and 2284 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 17:30:21,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:21,854 INFO L93 Difference]: Finished difference Result 3522 states and 4874 transitions. [2021-11-23 17:30:21,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:30:21,855 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 67 [2021-11-23 17:30:21,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:21,875 INFO L225 Difference]: With dead ends: 3522 [2021-11-23 17:30:21,876 INFO L226 Difference]: Without dead ends: 2992 [2021-11-23 17:30:21,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 382 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:30:21,879 INFO L933 BasicCegarLoop]: 141 mSDtfsCounter, 141 mSDsluCounter, 1191 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 1332 SdHoareTripleChecker+Invalid, 434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 195 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:21,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 1332 Invalid, 434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 233 Invalid, 0 Unknown, 195 Unchecked, 0.2s Time] [2021-11-23 17:30:21,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2992 states. [2021-11-23 17:30:22,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2992 to 2640. [2021-11-23 17:30:22,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2640 states, 2639 states have (on average 1.385373247442213) internal successors, (3656), 2639 states have internal predecessors, (3656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:22,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2640 states to 2640 states and 3656 transitions. [2021-11-23 17:30:22,116 INFO L78 Accepts]: Start accepts. Automaton has 2640 states and 3656 transitions. Word has length 67 [2021-11-23 17:30:22,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:22,117 INFO L470 AbstractCegarLoop]: Abstraction has 2640 states and 3656 transitions. [2021-11-23 17:30:22,117 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 17:30:22,118 INFO L276 IsEmpty]: Start isEmpty. Operand 2640 states and 3656 transitions. [2021-11-23 17:30:22,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 17:30:22,128 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:22,128 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] [2021-11-23 17:30:22,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:22,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:22,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:22,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:22,740 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:22,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:22,741 INFO L85 PathProgramCache]: Analyzing trace with hash 1391564060, now seen corresponding path program 1 times [2021-11-23 17:30:22,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:22,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [836873399] [2021-11-23 17:30:22,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:22,741 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:22,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:22,742 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:22,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:30:22,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:22,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:22,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:23,213 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:30:23,213 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:23,214 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:23,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [836873399] [2021-11-23 17:30:23,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [836873399] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:23,214 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:23,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:23,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953364241] [2021-11-23 17:30:23,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:23,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:23,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:23,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:23,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:23,216 INFO L87 Difference]: Start difference. First operand 2640 states and 3656 transitions. Second operand has 6 states, 6 states have (on average 10.5) 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 17:30:23,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:23,359 INFO L93 Difference]: Finished difference Result 3182 states and 4413 transitions. [2021-11-23 17:30:23,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:30:23,360 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.5) 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 67 [2021-11-23 17:30:23,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:23,374 INFO L225 Difference]: With dead ends: 3182 [2021-11-23 17:30:23,374 INFO L226 Difference]: Without dead ends: 2640 [2021-11-23 17:30:23,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 62 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 17:30:23,377 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 27 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:23,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 244 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 33 Unchecked, 0.0s Time] [2021-11-23 17:30:23,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2640 states. [2021-11-23 17:30:23,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2640 to 2640. [2021-11-23 17:30:23,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2640 states, 2639 states have (on average 1.3849943160287987) internal successors, (3655), 2639 states have internal predecessors, (3655), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:23,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2640 states to 2640 states and 3655 transitions. [2021-11-23 17:30:23,558 INFO L78 Accepts]: Start accepts. Automaton has 2640 states and 3655 transitions. Word has length 67 [2021-11-23 17:30:23,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:23,559 INFO L470 AbstractCegarLoop]: Abstraction has 2640 states and 3655 transitions. [2021-11-23 17:30:23,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.5) 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 17:30:23,560 INFO L276 IsEmpty]: Start isEmpty. Operand 2640 states and 3655 transitions. [2021-11-23 17:30:23,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:30:23,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:23,563 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 17:30:23,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:23,786 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:23,787 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:23,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:23,787 INFO L85 PathProgramCache]: Analyzing trace with hash -2091784699, now seen corresponding path program 1 times [2021-11-23 17:30:23,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:23,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [206693632] [2021-11-23 17:30:23,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:23,788 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:23,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:23,790 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:23,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 17:30:23,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:23,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:23,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:24,956 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:24,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:25,358 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:25,359 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:25,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [206693632] [2021-11-23 17:30:25,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [206693632] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:25,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2002787058] [2021-11-23 17:30:25,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:25,360 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:25,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:25,361 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:25,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-23 17:30:25,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:25,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:25,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:26,463 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:26,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:26,699 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:26,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2002787058] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:26,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1654431285] [2021-11-23 17:30:26,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:26,700 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:26,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:26,701 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:26,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 17:30:26,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:26,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:26,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:27,698 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:27,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:27,932 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:27,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1654431285] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:27,933 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:27,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:30:27,933 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024564706] [2021-11-23 17:30:27,934 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:27,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:30:27,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:27,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:30:27,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:30:27,941 INFO L87 Difference]: Start difference. First operand 2640 states and 3655 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 17:30:28,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:28,272 INFO L93 Difference]: Finished difference Result 5269 states and 7344 transitions. [2021-11-23 17:30:28,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:30:28,273 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 68 [2021-11-23 17:30:28,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:28,291 INFO L225 Difference]: With dead ends: 5269 [2021-11-23 17:30:28,291 INFO L226 Difference]: Without dead ends: 2795 [2021-11-23 17:30:28,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 388 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:30:28,296 INFO L933 BasicCegarLoop]: 145 mSDtfsCounter, 158 mSDsluCounter, 926 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 1071 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 87 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:28,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 1071 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 0 Unknown, 87 Unchecked, 0.1s Time] [2021-11-23 17:30:28,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2795 states. [2021-11-23 17:30:28,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2795 to 2679. [2021-11-23 17:30:28,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2679 states, 2678 states have (on average 1.383495145631068) internal successors, (3705), 2678 states have internal predecessors, (3705), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:28,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2679 states to 2679 states and 3705 transitions. [2021-11-23 17:30:28,449 INFO L78 Accepts]: Start accepts. Automaton has 2679 states and 3705 transitions. Word has length 68 [2021-11-23 17:30:28,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:28,450 INFO L470 AbstractCegarLoop]: Abstraction has 2679 states and 3705 transitions. [2021-11-23 17:30:28,450 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 17:30:28,450 INFO L276 IsEmpty]: Start isEmpty. Operand 2679 states and 3705 transitions. [2021-11-23 17:30:28,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:30:28,454 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:28,454 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 17:30:28,497 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:28,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:28,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:29,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:29,070 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:29,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:29,070 INFO L85 PathProgramCache]: Analyzing trace with hash -1843638205, now seen corresponding path program 1 times [2021-11-23 17:30:29,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:29,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [371031670] [2021-11-23 17:30:29,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:29,071 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:29,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:29,073 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:29,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:30:29,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:29,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:29,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:29,482 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:30:29,482 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:29,482 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:29,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [371031670] [2021-11-23 17:30:29,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [371031670] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:29,483 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:29,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:29,483 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950075002] [2021-11-23 17:30:29,483 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:29,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:29,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:29,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:29,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:29,485 INFO L87 Difference]: Start difference. First operand 2679 states and 3705 transitions. Second operand has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 5 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:29,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:29,663 INFO L93 Difference]: Finished difference Result 5230 states and 7258 transitions. [2021-11-23 17:30:29,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:30:29,663 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 5 states have internal predecessors, (62), 0 states have call successors, (0), 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 17:30:29,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:29,682 INFO L225 Difference]: With dead ends: 5230 [2021-11-23 17:30:29,682 INFO L226 Difference]: Without dead ends: 2673 [2021-11-23 17:30:29,689 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:30:29,690 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 35 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:29,690 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 186 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 9 Unchecked, 0.1s Time] [2021-11-23 17:30:29,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2673 states. [2021-11-23 17:30:29,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2673 to 2673. [2021-11-23 17:30:29,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2673 states, 2672 states have (on average 1.3832335329341316) internal successors, (3696), 2672 states have internal predecessors, (3696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:29,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2673 states to 2673 states and 3696 transitions. [2021-11-23 17:30:29,836 INFO L78 Accepts]: Start accepts. Automaton has 2673 states and 3696 transitions. Word has length 68 [2021-11-23 17:30:29,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:29,837 INFO L470 AbstractCegarLoop]: Abstraction has 2673 states and 3696 transitions. [2021-11-23 17:30:29,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.333333333333334) internal successors, (62), 5 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:29,837 INFO L276 IsEmpty]: Start isEmpty. Operand 2673 states and 3696 transitions. [2021-11-23 17:30:29,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:30:29,841 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:29,841 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 17:30:29,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:30,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:30,055 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:30,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:30,055 INFO L85 PathProgramCache]: Analyzing trace with hash 1953804567, now seen corresponding path program 1 times [2021-11-23 17:30:30,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:30,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1301962811] [2021-11-23 17:30:30,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:30,056 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:30,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:30,058 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:30,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:30:30,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:30,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:30,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:30,338 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:30,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:30,474 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:30,475 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:30,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1301962811] [2021-11-23 17:30:30,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1301962811] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:30,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1902822545] [2021-11-23 17:30:30,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:30,476 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:30,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:30,477 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:30,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-23 17:30:30,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:30,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:30,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:30,812 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:30,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:30,925 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:30,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1902822545] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:30,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331554656] [2021-11-23 17:30:30,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:30,926 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:30,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:30,928 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:30,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 17:30:30,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:30,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:30,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:31,944 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:31,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:32,388 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:32,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331554656] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:32,388 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:32,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 8, 8] total 22 [2021-11-23 17:30:32,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459041622] [2021-11-23 17:30:32,389 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:32,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:30:32,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:32,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:30:32,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:30:32,392 INFO L87 Difference]: Start difference. First operand 2673 states and 3696 transitions. Second operand has 22 states, 22 states have (on average 10.363636363636363) internal successors, (228), 22 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:33,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:33,046 INFO L93 Difference]: Finished difference Result 4644 states and 6412 transitions. [2021-11-23 17:30:33,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:30:33,047 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 10.363636363636363) internal successors, (228), 22 states have internal predecessors, (228), 0 states have call successors, (0), 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 17:30:33,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:33,077 INFO L225 Difference]: With dead ends: 4644 [2021-11-23 17:30:33,084 INFO L226 Difference]: Without dead ends: 2918 [2021-11-23 17:30:33,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 385 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=154, Invalid=902, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:30:33,088 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 137 mSDsluCounter, 921 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 1019 SdHoareTripleChecker+Invalid, 363 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 117 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:33,089 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 1019 Invalid, 363 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 240 Invalid, 0 Unknown, 117 Unchecked, 0.2s Time] [2021-11-23 17:30:33,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2918 states. [2021-11-23 17:30:33,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2918 to 2673. [2021-11-23 17:30:33,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2673 states, 2672 states have (on average 1.3828592814371257) internal successors, (3695), 2672 states have internal predecessors, (3695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:33,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2673 states to 2673 states and 3695 transitions. [2021-11-23 17:30:33,253 INFO L78 Accepts]: Start accepts. Automaton has 2673 states and 3695 transitions. Word has length 68 [2021-11-23 17:30:33,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:33,253 INFO L470 AbstractCegarLoop]: Abstraction has 2673 states and 3695 transitions. [2021-11-23 17:30:33,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 10.363636363636363) internal successors, (228), 22 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:33,254 INFO L276 IsEmpty]: Start isEmpty. Operand 2673 states and 3695 transitions. [2021-11-23 17:30:33,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:30:33,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:33,257 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 17:30:33,261 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (24)] Ended with exit code 0 [2021-11-23 17:30:33,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:33,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:33,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:33,869 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:33,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:33,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1740811621, now seen corresponding path program 1 times [2021-11-23 17:30:33,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:33,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1128031451] [2021-11-23 17:30:33,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:33,871 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:33,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:33,872 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:33,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 17:30:33,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:33,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:33,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:34,207 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:34,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:34,332 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:34,332 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:34,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1128031451] [2021-11-23 17:30:34,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1128031451] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:34,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1545836559] [2021-11-23 17:30:34,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:34,333 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:34,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:34,334 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:34,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-23 17:30:34,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:34,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:30:34,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:34,556 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:34,556 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:34,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1545836559] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:34,557 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:30:34,557 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5] total 10 [2021-11-23 17:30:34,557 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763856861] [2021-11-23 17:30:34,558 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:34,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:34,558 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:34,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:34,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:30:34,560 INFO L87 Difference]: Start difference. First operand 2673 states and 3695 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:34,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:34,710 INFO L93 Difference]: Finished difference Result 4602 states and 6347 transitions. [2021-11-23 17:30:34,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:34,710 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 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 17:30:34,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:34,719 INFO L225 Difference]: With dead ends: 4602 [2021-11-23 17:30:34,720 INFO L226 Difference]: Without dead ends: 3848 [2021-11-23 17:30:34,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 17:30:34,722 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 48 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:34,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 214 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:34,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3848 states. [2021-11-23 17:30:34,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3848 to 3846. [2021-11-23 17:30:34,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3846 states, 3845 states have (on average 1.365149544863459) internal successors, (5249), 3845 states have internal predecessors, (5249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:34,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3846 states to 3846 states and 5249 transitions. [2021-11-23 17:30:34,932 INFO L78 Accepts]: Start accepts. Automaton has 3846 states and 5249 transitions. Word has length 68 [2021-11-23 17:30:34,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:34,933 INFO L470 AbstractCegarLoop]: Abstraction has 3846 states and 5249 transitions. [2021-11-23 17:30:34,933 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:34,933 INFO L276 IsEmpty]: Start isEmpty. Operand 3846 states and 5249 transitions. [2021-11-23 17:30:34,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:30:34,937 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:34,937 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 17:30:34,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:35,146 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Ended with exit code 0 [2021-11-23 17:30:35,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:35,339 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:35,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:35,340 INFO L85 PathProgramCache]: Analyzing trace with hash -942543571, now seen corresponding path program 1 times [2021-11-23 17:30:35,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:35,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1826025924] [2021-11-23 17:30:35,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:35,341 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:35,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:35,342 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:35,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:30:35,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:35,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:35,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:35,639 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 17:30:35,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:35,766 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 17:30:35,766 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:35,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1826025924] [2021-11-23 17:30:35,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1826025924] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:35,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1389363957] [2021-11-23 17:30:35,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:35,767 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:35,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:35,771 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:35,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-23 17:30:35,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:35,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:35,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:36,099 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 17:30:36,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:36,201 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 17:30:36,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1389363957] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:36,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [864980938] [2021-11-23 17:30:36,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:36,204 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:36,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:36,211 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:36,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 17:30:36,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:36,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:30:36,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:36,602 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 17:30:36,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:36,835 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 17:30:36,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [864980938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:36,836 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:36,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 18 [2021-11-23 17:30:36,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626259214] [2021-11-23 17:30:36,836 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:36,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:30:36,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:36,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:30:36,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:30:36,839 INFO L87 Difference]: Start difference. First operand 3846 states and 5249 transitions. Second operand has 18 states, 18 states have (on average 12.666666666666666) internal successors, (228), 18 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:37,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:37,575 INFO L93 Difference]: Finished difference Result 9498 states and 12934 transitions. [2021-11-23 17:30:37,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:30:37,576 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 12.666666666666666) internal successors, (228), 18 states have internal predecessors, (228), 0 states have call successors, (0), 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 17:30:37,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:37,588 INFO L225 Difference]: With dead ends: 9498 [2021-11-23 17:30:37,588 INFO L226 Difference]: Without dead ends: 5864 [2021-11-23 17:30:37,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 387 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2021-11-23 17:30:37,594 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 1775 mSDsluCounter, 528 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1775 SdHoareTripleChecker+Valid, 603 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:37,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1775 Valid, 603 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 273 Invalid, 0 Unknown, 1 Unchecked, 0.3s Time] [2021-11-23 17:30:37,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5864 states. [2021-11-23 17:30:37,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5864 to 4367. [2021-11-23 17:30:37,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4367 states, 4366 states have (on average 1.3467704993128722) internal successors, (5880), 4366 states have internal predecessors, (5880), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:37,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4367 states to 4367 states and 5880 transitions. [2021-11-23 17:30:37,867 INFO L78 Accepts]: Start accepts. Automaton has 4367 states and 5880 transitions. Word has length 68 [2021-11-23 17:30:37,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:37,867 INFO L470 AbstractCegarLoop]: Abstraction has 4367 states and 5880 transitions. [2021-11-23 17:30:37,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 12.666666666666666) internal successors, (228), 18 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:37,868 INFO L276 IsEmpty]: Start isEmpty. Operand 4367 states and 5880 transitions. [2021-11-23 17:30:37,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:30:37,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:37,872 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:37,879 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:38,099 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-11-23 17:30:38,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:38,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:38,475 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:38,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:38,475 INFO L85 PathProgramCache]: Analyzing trace with hash 2001712913, now seen corresponding path program 1 times [2021-11-23 17:30:38,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:38,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [923123867] [2021-11-23 17:30:38,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:38,476 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:38,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:38,477 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:38,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:30:38,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:38,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:30:38,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:38,669 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:38,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:38,669 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:38,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [923123867] [2021-11-23 17:30:38,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [923123867] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:38,670 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:38,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:30:38,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644165406] [2021-11-23 17:30:38,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:38,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:38,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:38,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:38,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:38,673 INFO L87 Difference]: Start difference. First operand 4367 states and 5880 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:38,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:38,788 INFO L93 Difference]: Finished difference Result 6701 states and 9038 transitions. [2021-11-23 17:30:38,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:38,788 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 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 17:30:38,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:38,794 INFO L225 Difference]: With dead ends: 6701 [2021-11-23 17:30:38,794 INFO L226 Difference]: Without dead ends: 2597 [2021-11-23 17:30:38,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:38,801 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 42 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 191 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 17:30:38,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 191 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:38,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2597 states. [2021-11-23 17:30:38,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2597 to 2595. [2021-11-23 17:30:38,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2595 states, 2594 states have (on average 1.3180416345412491) internal successors, (3419), 2594 states have internal predecessors, (3419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:38,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2595 states to 2595 states and 3419 transitions. [2021-11-23 17:30:38,992 INFO L78 Accepts]: Start accepts. Automaton has 2595 states and 3419 transitions. Word has length 68 [2021-11-23 17:30:38,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:38,993 INFO L470 AbstractCegarLoop]: Abstraction has 2595 states and 3419 transitions. [2021-11-23 17:30:38,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:38,993 INFO L276 IsEmpty]: Start isEmpty. Operand 2595 states and 3419 transitions. [2021-11-23 17:30:38,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:30:38,997 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:38,997 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 17:30:39,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:39,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:39,208 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:39,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:39,209 INFO L85 PathProgramCache]: Analyzing trace with hash -2019580885, now seen corresponding path program 1 times [2021-11-23 17:30:39,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:39,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1055080473] [2021-11-23 17:30:39,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:39,210 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:39,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:39,210 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:39,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:30:39,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:39,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:30:39,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:39,473 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:30:39,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:39,630 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:30:39,630 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:39,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1055080473] [2021-11-23 17:30:39,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1055080473] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:39,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [336781714] [2021-11-23 17:30:39,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:39,631 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:39,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:39,644 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:39,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 17:30:39,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:39,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:30:39,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:39,945 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:30:39,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:40,099 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:30:40,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [336781714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:40,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107079680] [2021-11-23 17:30:40,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:40,100 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:40,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:40,101 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:40,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 17:30:40,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:40,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:30:40,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:40,364 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:30:40,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:40,669 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:40,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107079680] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:40,670 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:40,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 5] total 7 [2021-11-23 17:30:40,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009010890] [2021-11-23 17:30:40,671 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:40,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:30:40,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:40,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:30:40,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:30:40,672 INFO L87 Difference]: Start difference. First operand 2595 states and 3419 transitions. Second operand has 7 states, 7 states have (on average 23.714285714285715) internal successors, (166), 7 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:41,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:41,096 INFO L93 Difference]: Finished difference Result 10450 states and 13832 transitions. [2021-11-23 17:30:41,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:30:41,097 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 23.714285714285715) internal successors, (166), 7 states have internal predecessors, (166), 0 states have call successors, (0), 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 17:30:41,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:41,114 INFO L225 Difference]: With dead ends: 10450 [2021-11-23 17:30:41,114 INFO L226 Difference]: Without dead ends: 8118 [2021-11-23 17:30:41,119 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 395 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:30:41,120 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 293 mSDsluCounter, 472 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 611 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 22 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:41,120 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [293 Valid, 611 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 28 Invalid, 0 Unknown, 22 Unchecked, 0.0s Time] [2021-11-23 17:30:41,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8118 states. [2021-11-23 17:30:41,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8118 to 7780. [2021-11-23 17:30:41,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7780 states, 7779 states have (on average 1.2961820285383725) internal successors, (10083), 7779 states have internal predecessors, (10083), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:41,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7780 states to 7780 states and 10083 transitions. [2021-11-23 17:30:41,726 INFO L78 Accepts]: Start accepts. Automaton has 7780 states and 10083 transitions. Word has length 68 [2021-11-23 17:30:41,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:41,727 INFO L470 AbstractCegarLoop]: Abstraction has 7780 states and 10083 transitions. [2021-11-23 17:30:41,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 23.714285714285715) internal successors, (166), 7 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:41,727 INFO L276 IsEmpty]: Start isEmpty. Operand 7780 states and 10083 transitions. [2021-11-23 17:30:41,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:30:41,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:41,731 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 17:30:41,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:41,968 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-11-23 17:30:42,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:42,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:42,344 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:42,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:42,345 INFO L85 PathProgramCache]: Analyzing trace with hash -515197507, now seen corresponding path program 1 times [2021-11-23 17:30:42,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:42,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [285375136] [2021-11-23 17:30:42,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:42,346 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:42,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:42,346 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:42,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:30:42,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:42,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:30:42,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:42,527 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:42,528 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:42,528 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:42,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [285375136] [2021-11-23 17:30:42,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [285375136] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:42,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:42,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:30:42,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128447770] [2021-11-23 17:30:42,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:42,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:42,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:42,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:42,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:42,529 INFO L87 Difference]: Start difference. First operand 7780 states and 10083 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:42,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:42,894 INFO L93 Difference]: Finished difference Result 10613 states and 13692 transitions. [2021-11-23 17:30:42,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:42,895 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 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 17:30:42,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:42,912 INFO L225 Difference]: With dead ends: 10613 [2021-11-23 17:30:42,912 INFO L226 Difference]: Without dead ends: 6695 [2021-11-23 17:30:42,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:42,919 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 48 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:42,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 226 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:42,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6695 states. [2021-11-23 17:30:43,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6695 to 4503. [2021-11-23 17:30:43,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4503 states, 4502 states have (on average 1.2905375388716127) internal successors, (5810), 4502 states have internal predecessors, (5810), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:43,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4503 states to 4503 states and 5810 transitions. [2021-11-23 17:30:43,308 INFO L78 Accepts]: Start accepts. Automaton has 4503 states and 5810 transitions. Word has length 68 [2021-11-23 17:30:43,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:43,308 INFO L470 AbstractCegarLoop]: Abstraction has 4503 states and 5810 transitions. [2021-11-23 17:30:43,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:43,309 INFO L276 IsEmpty]: Start isEmpty. Operand 4503 states and 5810 transitions. [2021-11-23 17:30:43,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 17:30:43,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:43,311 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 17:30:43,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:43,524 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:43,524 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:43,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:43,525 INFO L85 PathProgramCache]: Analyzing trace with hash 695429839, now seen corresponding path program 1 times [2021-11-23 17:30:43,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:43,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [767179966] [2021-11-23 17:30:43,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:43,526 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:43,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:43,527 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:43,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 17:30:43,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:43,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:30:43,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:43,731 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:43,731 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:43,731 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:43,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [767179966] [2021-11-23 17:30:43,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [767179966] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:43,732 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:43,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:30:43,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975456099] [2021-11-23 17:30:43,733 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:43,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:43,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:43,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:43,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:43,734 INFO L87 Difference]: Start difference. First operand 4503 states and 5810 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:44,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:44,028 INFO L93 Difference]: Finished difference Result 9075 states and 11653 transitions. [2021-11-23 17:30:44,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:44,030 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 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 17:30:44,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:44,039 INFO L225 Difference]: With dead ends: 9075 [2021-11-23 17:30:44,040 INFO L226 Difference]: Without dead ends: 5872 [2021-11-23 17:30:44,045 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:44,045 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 46 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:44,046 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 211 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:44,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5872 states. [2021-11-23 17:30:44,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5872 to 5860. [2021-11-23 17:30:44,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5860 states, 5859 states have (on average 1.2688172043010753) internal successors, (7434), 5859 states have internal predecessors, (7434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:44,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5860 states to 5860 states and 7434 transitions. [2021-11-23 17:30:44,534 INFO L78 Accepts]: Start accepts. Automaton has 5860 states and 7434 transitions. Word has length 68 [2021-11-23 17:30:44,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:44,535 INFO L470 AbstractCegarLoop]: Abstraction has 5860 states and 7434 transitions. [2021-11-23 17:30:44,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:44,535 INFO L276 IsEmpty]: Start isEmpty. Operand 5860 states and 7434 transitions. [2021-11-23 17:30:44,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:30:44,539 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:44,539 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, 1] [2021-11-23 17:30:44,566 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Ended with exit code 0 [2021-11-23 17:30:44,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:44,751 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:44,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:44,751 INFO L85 PathProgramCache]: Analyzing trace with hash 393799180, now seen corresponding path program 1 times [2021-11-23 17:30:44,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:44,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [439704697] [2021-11-23 17:30:44,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:44,752 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:44,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:44,753 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:44,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:30:44,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:44,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:30:44,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:44,952 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:44,954 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:44,955 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:44,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [439704697] [2021-11-23 17:30:44,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [439704697] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:44,955 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:44,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:30:44,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593320331] [2021-11-23 17:30:44,956 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:44,959 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:44,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:44,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:44,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:44,961 INFO L87 Difference]: Start difference. First operand 5860 states and 7434 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:45,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:45,258 INFO L93 Difference]: Finished difference Result 9002 states and 11357 transitions. [2021-11-23 17:30:45,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:45,258 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 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 17:30:45,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:45,264 INFO L225 Difference]: With dead ends: 9002 [2021-11-23 17:30:45,264 INFO L226 Difference]: Without dead ends: 5898 [2021-11-23 17:30:45,268 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:30:45,269 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 47 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:45,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 239 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:45,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5898 states. [2021-11-23 17:30:45,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5898 to 5871. [2021-11-23 17:30:45,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5871 states, 5870 states have (on average 1.253833049403748) internal successors, (7360), 5870 states have internal predecessors, (7360), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:45,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5871 states to 5871 states and 7360 transitions. [2021-11-23 17:30:45,564 INFO L78 Accepts]: Start accepts. Automaton has 5871 states and 7360 transitions. Word has length 69 [2021-11-23 17:30:45,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:45,564 INFO L470 AbstractCegarLoop]: Abstraction has 5871 states and 7360 transitions. [2021-11-23 17:30:45,565 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:45,565 INFO L276 IsEmpty]: Start isEmpty. Operand 5871 states and 7360 transitions. [2021-11-23 17:30:45,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:30:45,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:45,568 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, 1] [2021-11-23 17:30:45,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:45,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:45,781 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:45,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:45,782 INFO L85 PathProgramCache]: Analyzing trace with hash 1350421053, now seen corresponding path program 1 times [2021-11-23 17:30:45,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:45,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1285390236] [2021-11-23 17:30:45,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:45,782 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:45,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:45,783 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:45,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 17:30:45,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:45,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:45,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:46,459 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 17:30:46,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:46,856 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 17:30:46,856 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:46,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1285390236] [2021-11-23 17:30:46,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1285390236] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:46,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1987361587] [2021-11-23 17:30:46,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:46,857 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:46,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:46,862 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:46,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-23 17:30:46,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:46,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:46,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:47,551 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 17:30:47,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:47,923 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 17:30:47,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1987361587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:47,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489732120] [2021-11-23 17:30:47,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:47,924 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:47,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:47,925 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:47,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-23 17:30:47,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:47,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:47,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:48,631 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 17:30:48,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:49,038 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 17:30:49,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [489732120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:49,038 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:49,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:30:49,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754925321] [2021-11-23 17:30:49,039 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:49,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:30:49,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:49,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:30:49,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:30:49,040 INFO L87 Difference]: Start difference. First operand 5871 states and 7360 transitions. Second operand has 16 states, 16 states have (on average 7.5) internal successors, (120), 15 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:49,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:49,736 INFO L93 Difference]: Finished difference Result 8771 states and 10873 transitions. [2021-11-23 17:30:49,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:30:49,737 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.5) internal successors, (120), 15 states have internal predecessors, (120), 0 states have call successors, (0), 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 17:30:49,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:49,746 INFO L225 Difference]: With dead ends: 8771 [2021-11-23 17:30:49,746 INFO L226 Difference]: Without dead ends: 8068 [2021-11-23 17:30:49,748 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:30:49,749 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 147 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 810 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:49,749 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 810 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 134 Invalid, 0 Unknown, 93 Unchecked, 0.1s Time] [2021-11-23 17:30:49,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8068 states. [2021-11-23 17:30:50,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8068 to 5885. [2021-11-23 17:30:50,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5885 states, 5884 states have (on average 1.2532290958531611) internal successors, (7374), 5884 states have internal predecessors, (7374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:50,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5885 states to 5885 states and 7374 transitions. [2021-11-23 17:30:50,137 INFO L78 Accepts]: Start accepts. Automaton has 5885 states and 7374 transitions. Word has length 69 [2021-11-23 17:30:50,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:50,137 INFO L470 AbstractCegarLoop]: Abstraction has 5885 states and 7374 transitions. [2021-11-23 17:30:50,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.5) internal successors, (120), 15 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:50,138 INFO L276 IsEmpty]: Start isEmpty. Operand 5885 states and 7374 transitions. [2021-11-23 17:30:50,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:30:50,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:50,141 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, 1] [2021-11-23 17:30:50,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:50,353 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Ended with exit code 0 [2021-11-23 17:30:50,575 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2021-11-23 17:30:50,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:50,751 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:50,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:50,751 INFO L85 PathProgramCache]: Analyzing trace with hash 1278034495, now seen corresponding path program 1 times [2021-11-23 17:30:50,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:50,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [961997696] [2021-11-23 17:30:50,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:50,752 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:50,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:50,759 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:50,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 17:30:50,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:50,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:50,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:51,210 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 17:30:51,210 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:51,211 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:51,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [961997696] [2021-11-23 17:30:51,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [961997696] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:51,211 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:51,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:51,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697557638] [2021-11-23 17:30:51,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:51,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:51,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:51,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:51,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:51,214 INFO L87 Difference]: Start difference. First operand 5885 states and 7374 transitions. Second operand has 6 states, 6 states have (on average 11.0) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:51,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:51,668 INFO L93 Difference]: Finished difference Result 6589 states and 8223 transitions. [2021-11-23 17:30:51,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:30:51,669 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.0) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 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 17:30:51,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:51,676 INFO L225 Difference]: With dead ends: 6589 [2021-11-23 17:30:51,677 INFO L226 Difference]: Without dead ends: 5871 [2021-11-23 17:30:51,679 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:30:51,680 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 35 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:51,686 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 253 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 37 Unchecked, 0.0s Time] [2021-11-23 17:30:51,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5871 states. [2021-11-23 17:30:51,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5871 to 5871. [2021-11-23 17:30:51,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5871 states, 5870 states have (on average 1.2534923339011925) internal successors, (7358), 5870 states have internal predecessors, (7358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:51,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5871 states to 5871 states and 7358 transitions. [2021-11-23 17:30:51,973 INFO L78 Accepts]: Start accepts. Automaton has 5871 states and 7358 transitions. Word has length 69 [2021-11-23 17:30:51,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:51,974 INFO L470 AbstractCegarLoop]: Abstraction has 5871 states and 7358 transitions. [2021-11-23 17:30:51,974 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.0) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:51,974 INFO L276 IsEmpty]: Start isEmpty. Operand 5871 states and 7358 transitions. [2021-11-23 17:30:51,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-23 17:30:51,977 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:51,977 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, 1] [2021-11-23 17:30:51,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:52,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:52,178 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:52,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:52,178 INFO L85 PathProgramCache]: Analyzing trace with hash -175036956, now seen corresponding path program 1 times [2021-11-23 17:30:52,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:52,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1611674553] [2021-11-23 17:30:52,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:52,179 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:52,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:52,180 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:52,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 17:30:52,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:52,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:52,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:52,477 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 17:30:52,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:52,604 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 17:30:52,604 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:52,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1611674553] [2021-11-23 17:30:52,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1611674553] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:52,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [856626492] [2021-11-23 17:30:52,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:52,605 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:52,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:52,606 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:52,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-23 17:30:52,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:52,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:52,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:52,957 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 17:30:52,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:53,071 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 17:30:53,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [856626492] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:53,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029666864] [2021-11-23 17:30:53,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:53,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:53,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:53,073 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:53,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 17:30:53,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:53,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:30:53,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:53,461 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 17:30:53,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:53,723 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 17:30:53,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029666864] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:53,724 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:53,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 18 [2021-11-23 17:30:53,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590701510] [2021-11-23 17:30:53,725 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:53,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:30:53,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:53,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:30:53,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:30:53,726 INFO L87 Difference]: Start difference. First operand 5871 states and 7358 transitions. Second operand has 18 states, 18 states have (on average 13.333333333333334) internal successors, (240), 18 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:55,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:55,019 INFO L93 Difference]: Finished difference Result 17318 states and 21447 transitions. [2021-11-23 17:30:55,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:30:55,020 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 13.333333333333334) internal successors, (240), 18 states have internal predecessors, (240), 0 states have call successors, (0), 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 17:30:55,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:55,034 INFO L225 Difference]: With dead ends: 17318 [2021-11-23 17:30:55,034 INFO L226 Difference]: Without dead ends: 12728 [2021-11-23 17:30:55,040 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 394 SyntacticMatches, 7 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=214, Invalid=598, Unknown=0, NotChecked=0, Total=812 [2021-11-23 17:30:55,040 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 1416 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 351 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1416 SdHoareTripleChecker+Valid, 624 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 7 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:55,041 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1416 Valid, 624 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 351 Invalid, 0 Unknown, 7 Unchecked, 0.3s Time] [2021-11-23 17:30:55,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12728 states. [2021-11-23 17:30:55,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12728 to 6857. [2021-11-23 17:30:55,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6857 states, 6856 states have (on average 1.2516044340723453) internal successors, (8581), 6856 states have internal predecessors, (8581), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:55,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6857 states to 6857 states and 8581 transitions. [2021-11-23 17:30:55,566 INFO L78 Accepts]: Start accepts. Automaton has 6857 states and 8581 transitions. Word has length 69 [2021-11-23 17:30:55,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:55,566 INFO L470 AbstractCegarLoop]: Abstraction has 6857 states and 8581 transitions. [2021-11-23 17:30:55,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 13.333333333333334) internal successors, (240), 18 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:55,566 INFO L276 IsEmpty]: Start isEmpty. Operand 6857 states and 8581 transitions. [2021-11-23 17:30:55,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 17:30:55,569 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:55,569 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, 1, 1] [2021-11-23 17:30:55,583 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:55,784 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:56,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:56,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:56,183 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:56,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:56,185 INFO L85 PathProgramCache]: Analyzing trace with hash 1296251140, now seen corresponding path program 1 times [2021-11-23 17:30:56,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:56,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [217813582] [2021-11-23 17:30:56,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:56,185 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:56,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:56,186 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:56,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 17:30:56,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:56,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:56,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:56,476 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 17:30:56,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:56,609 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 17:30:56,609 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:56,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [217813582] [2021-11-23 17:30:56,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [217813582] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:56,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1689507426] [2021-11-23 17:30:56,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:56,610 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:56,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:56,627 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:56,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 17:30:56,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:56,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:56,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:56,947 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 17:30:56,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:57,081 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 17:30:57,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1689507426] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:57,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466275557] [2021-11-23 17:30:57,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:57,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:57,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:57,086 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:57,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 17:30:57,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:57,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:30:57,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:57,482 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 17:30:57,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:57,705 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 17:30:57,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466275557] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:57,706 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:57,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 18 [2021-11-23 17:30:57,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876263729] [2021-11-23 17:30:57,706 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:57,707 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:30:57,707 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:57,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:30:57,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:30:57,708 INFO L87 Difference]: Start difference. First operand 6857 states and 8581 transitions. Second operand has 18 states, 18 states have (on average 12.666666666666666) internal successors, (228), 18 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:58,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:58,731 INFO L93 Difference]: Finished difference Result 13385 states and 16694 transitions. [2021-11-23 17:30:58,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 17:30:58,732 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 12.666666666666666) internal successors, (228), 18 states have internal predecessors, (228), 0 states have call successors, (0), 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 70 [2021-11-23 17:30:58,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:58,743 INFO L225 Difference]: With dead ends: 13385 [2021-11-23 17:30:58,743 INFO L226 Difference]: Without dead ends: 10473 [2021-11-23 17:30:58,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 399 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=129, Invalid=377, Unknown=0, NotChecked=0, Total=506 [2021-11-23 17:30:58,748 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 1189 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1189 SdHoareTripleChecker+Valid, 474 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:58,748 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1189 Valid, 474 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 187 Invalid, 0 Unknown, 1 Unchecked, 0.2s Time] [2021-11-23 17:30:58,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10473 states. [2021-11-23 17:30:59,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10473 to 7763. [2021-11-23 17:30:59,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7763 states, 7762 states have (on average 1.2440092759598043) internal successors, (9656), 7762 states have internal predecessors, (9656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:59,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7763 states to 7763 states and 9656 transitions. [2021-11-23 17:30:59,371 INFO L78 Accepts]: Start accepts. Automaton has 7763 states and 9656 transitions. Word has length 70 [2021-11-23 17:30:59,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:59,372 INFO L470 AbstractCegarLoop]: Abstraction has 7763 states and 9656 transitions. [2021-11-23 17:30:59,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 12.666666666666666) internal successors, (228), 18 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:59,372 INFO L276 IsEmpty]: Start isEmpty. Operand 7763 states and 9656 transitions. [2021-11-23 17:30:59,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 17:30:59,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:59,375 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, 1, 1] [2021-11-23 17:30:59,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:59,613 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-23 17:30:59,789 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Ended with exit code 0 [2021-11-23 17:30:59,988 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:59,988 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:59,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:59,989 INFO L85 PathProgramCache]: Analyzing trace with hash 1676636168, now seen corresponding path program 1 times [2021-11-23 17:30:59,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:59,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [905207540] [2021-11-23 17:30:59,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:59,990 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:59,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:59,991 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:59,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:31:00,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:00,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:00,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:01,080 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 17:31:01,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:01,478 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 17:31:01,478 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:01,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [905207540] [2021-11-23 17:31:01,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [905207540] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:01,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [684597429] [2021-11-23 17:31:01,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:01,479 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:01,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:01,480 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:01,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 17:31:01,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:01,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:01,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:02,607 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 17:31:02,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:02,960 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 17:31:02,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [684597429] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:02,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069989666] [2021-11-23 17:31:02,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:02,960 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:02,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:02,961 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:02,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 17:31:03,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:03,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:03,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:03,951 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 17:31:03,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:04,344 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 17:31:04,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069989666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:04,345 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:04,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:31:04,345 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264426273] [2021-11-23 17:31:04,346 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:04,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:31:04,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:04,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:31:04,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:31:04,348 INFO L87 Difference]: Start difference. First operand 7763 states and 9656 transitions. Second operand has 16 states, 16 states have (on average 8.3125) internal successors, (133), 15 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:05,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:05,233 INFO L93 Difference]: Finished difference Result 10166 states and 12532 transitions. [2021-11-23 17:31:05,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:31:05,234 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.3125) internal successors, (133), 15 states have internal predecessors, (133), 0 states have call successors, (0), 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 70 [2021-11-23 17:31:05,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:05,243 INFO L225 Difference]: With dead ends: 10166 [2021-11-23 17:31:05,244 INFO L226 Difference]: Without dead ends: 8507 [2021-11-23 17:31:05,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 400 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:31:05,247 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 132 mSDsluCounter, 638 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 736 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 97 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:05,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 736 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 163 Invalid, 0 Unknown, 97 Unchecked, 0.1s Time] [2021-11-23 17:31:05,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8507 states. [2021-11-23 17:31:05,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8507 to 7797. [2021-11-23 17:31:05,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7797 states, 7796 states have (on average 1.2437147255002565) internal successors, (9696), 7796 states have internal predecessors, (9696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:05,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7797 states to 7797 states and 9696 transitions. [2021-11-23 17:31:05,998 INFO L78 Accepts]: Start accepts. Automaton has 7797 states and 9696 transitions. Word has length 70 [2021-11-23 17:31:05,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:05,998 INFO L470 AbstractCegarLoop]: Abstraction has 7797 states and 9696 transitions. [2021-11-23 17:31:05,998 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.3125) internal successors, (133), 15 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:05,999 INFO L276 IsEmpty]: Start isEmpty. Operand 7797 states and 9696 transitions. [2021-11-23 17:31:06,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 17:31:06,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:06,002 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, 1, 1] [2021-11-23 17:31:06,016 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Ended with exit code 0 [2021-11-23 17:31:06,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:06,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:06,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:06,617 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:06,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:06,618 INFO L85 PathProgramCache]: Analyzing trace with hash 647276870, now seen corresponding path program 1 times [2021-11-23 17:31:06,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:06,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [44167600] [2021-11-23 17:31:06,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:06,618 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:06,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:06,619 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:06,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 17:31:06,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:06,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:31:06,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:07,000 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 17:31:07,000 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:07,001 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:07,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [44167600] [2021-11-23 17:31:07,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [44167600] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:07,001 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:07,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:07,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902393440] [2021-11-23 17:31:07,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:07,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:31:07,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:07,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:31:07,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:07,003 INFO L87 Difference]: Start difference. First operand 7797 states and 9696 transitions. Second operand has 6 states, 6 states have (on average 11.0) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:07,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:07,602 INFO L93 Difference]: Finished difference Result 11417 states and 14205 transitions. [2021-11-23 17:31:07,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:31:07,603 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.0) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 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 70 [2021-11-23 17:31:07,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:07,612 INFO L225 Difference]: With dead ends: 11417 [2021-11-23 17:31:07,612 INFO L226 Difference]: Without dead ends: 7778 [2021-11-23 17:31:07,617 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:31:07,618 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 27 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:07,618 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 287 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 37 Unchecked, 0.0s Time] [2021-11-23 17:31:07,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7778 states. [2021-11-23 17:31:08,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7778 to 7778. [2021-11-23 17:31:08,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7778 states, 7777 states have (on average 1.243924392439244) internal successors, (9674), 7777 states have internal predecessors, (9674), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:08,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7778 states to 7778 states and 9674 transitions. [2021-11-23 17:31:08,216 INFO L78 Accepts]: Start accepts. Automaton has 7778 states and 9674 transitions. Word has length 70 [2021-11-23 17:31:08,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:08,216 INFO L470 AbstractCegarLoop]: Abstraction has 7778 states and 9674 transitions. [2021-11-23 17:31:08,217 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.0) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:08,217 INFO L276 IsEmpty]: Start isEmpty. Operand 7778 states and 9674 transitions. [2021-11-23 17:31:08,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 17:31:08,220 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:08,220 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, 1, 1] [2021-11-23 17:31:08,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:08,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:08,433 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:08,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:08,434 INFO L85 PathProgramCache]: Analyzing trace with hash -980357718, now seen corresponding path program 1 times [2021-11-23 17:31:08,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:08,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [745844536] [2021-11-23 17:31:08,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:08,434 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:08,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:08,435 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:08,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-23 17:31:08,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:08,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:08,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:09,546 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 17:31:09,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:09,873 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 17:31:09,873 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:09,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [745844536] [2021-11-23 17:31:09,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [745844536] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:09,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1762448545] [2021-11-23 17:31:09,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:09,874 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:09,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:09,875 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:09,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2021-11-23 17:31:09,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:09,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:09,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:11,057 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 17:31:11,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:11,339 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 17:31:11,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1762448545] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:11,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560525199] [2021-11-23 17:31:11,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:11,340 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:11,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:11,343 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:11,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-23 17:31:11,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:11,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:11,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:12,511 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 17:31:12,512 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:12,762 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 17:31:12,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560525199] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:12,762 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:12,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:31:12,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442168174] [2021-11-23 17:31:12,763 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:12,764 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:31:12,764 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:12,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:31:12,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:31:12,765 INFO L87 Difference]: Start difference. First operand 7778 states and 9674 transitions. Second operand has 16 states, 16 states have (on average 8.0625) internal successors, (129), 15 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 17:31:13,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:13,648 INFO L93 Difference]: Finished difference Result 9570 states and 11921 transitions. [2021-11-23 17:31:13,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:31:13,649 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.0625) internal successors, (129), 15 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 70 [2021-11-23 17:31:13,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:13,657 INFO L225 Difference]: With dead ends: 9570 [2021-11-23 17:31:13,658 INFO L226 Difference]: Without dead ends: 7822 [2021-11-23 17:31:13,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 401 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:31:13,661 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 182 mSDsluCounter, 867 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 992 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 84 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:13,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 992 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 61 Invalid, 0 Unknown, 84 Unchecked, 0.1s Time] [2021-11-23 17:31:13,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7822 states. [2021-11-23 17:31:14,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7822 to 7807. [2021-11-23 17:31:14,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7807 states, 7806 states have (on average 1.2439149372277736) internal successors, (9710), 7806 states have internal predecessors, (9710), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:14,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7807 states to 7807 states and 9710 transitions. [2021-11-23 17:31:14,232 INFO L78 Accepts]: Start accepts. Automaton has 7807 states and 9710 transitions. Word has length 70 [2021-11-23 17:31:14,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:14,233 INFO L470 AbstractCegarLoop]: Abstraction has 7807 states and 9710 transitions. [2021-11-23 17:31:14,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.0625) internal successors, (129), 15 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 17:31:14,233 INFO L276 IsEmpty]: Start isEmpty. Operand 7807 states and 9710 transitions. [2021-11-23 17:31:14,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 17:31:14,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:14,236 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, 1, 1] [2021-11-23 17:31:14,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:14,463 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2021-11-23 17:31:14,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:14,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:14,839 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:14,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:14,839 INFO L85 PathProgramCache]: Analyzing trace with hash -1052744276, now seen corresponding path program 1 times [2021-11-23 17:31:14,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:14,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1196301805] [2021-11-23 17:31:14,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:14,840 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:14,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:14,841 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:14,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (55)] Waiting until timeout for monitored process [2021-11-23 17:31:14,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:14,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:31:14,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:15,248 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 17:31:15,248 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:15,248 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:15,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1196301805] [2021-11-23 17:31:15,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1196301805] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:15,248 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:15,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:15,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911530284] [2021-11-23 17:31:15,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:15,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:31:15,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:15,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:31:15,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:15,251 INFO L87 Difference]: Start difference. First operand 7807 states and 9710 transitions. Second operand has 6 states, 6 states have (on average 11.166666666666666) internal successors, (67), 5 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 17:31:15,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:15,921 INFO L93 Difference]: Finished difference Result 9760 states and 12150 transitions. [2021-11-23 17:31:15,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:31:15,922 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.166666666666666) internal successors, (67), 5 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 70 [2021-11-23 17:31:15,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:15,933 INFO L225 Difference]: With dead ends: 9760 [2021-11-23 17:31:15,933 INFO L226 Difference]: Without dead ends: 7782 [2021-11-23 17:31:15,936 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 65 SyntacticMatches, 0 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 17:31:15,937 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 27 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:15,937 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 248 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 35 Unchecked, 0.0s Time] [2021-11-23 17:31:15,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7782 states. [2021-11-23 17:31:16,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7782 to 7782. [2021-11-23 17:31:16,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7782 states, 7781 states have (on average 1.243541961187508) internal successors, (9676), 7781 states have internal predecessors, (9676), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:16,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7782 states to 7782 states and 9676 transitions. [2021-11-23 17:31:16,513 INFO L78 Accepts]: Start accepts. Automaton has 7782 states and 9676 transitions. Word has length 70 [2021-11-23 17:31:16,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:16,513 INFO L470 AbstractCegarLoop]: Abstraction has 7782 states and 9676 transitions. [2021-11-23 17:31:16,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.166666666666666) internal successors, (67), 5 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 17:31:16,513 INFO L276 IsEmpty]: Start isEmpty. Operand 7782 states and 9676 transitions. [2021-11-23 17:31:16,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 17:31:16,515 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:16,515 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, 1, 1] [2021-11-23 17:31:16,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (55)] Ended with exit code 0 [2021-11-23 17:31:16,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:16,718 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:16,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:16,719 INFO L85 PathProgramCache]: Analyzing trace with hash -615005878, now seen corresponding path program 1 times [2021-11-23 17:31:16,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:16,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1161613902] [2021-11-23 17:31:16,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:16,721 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:16,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:16,722 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:16,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 17:31:16,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:16,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:31:16,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:17,119 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 17:31:17,119 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:17,120 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:17,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1161613902] [2021-11-23 17:31:17,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1161613902] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:17,120 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:17,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:17,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008072877] [2021-11-23 17:31:17,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:17,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:31:17,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:17,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:31:17,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:31:17,122 INFO L87 Difference]: Start difference. First operand 7782 states and 9676 transitions. Second operand has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 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 17:31:17,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:17,908 INFO L93 Difference]: Finished difference Result 12647 states and 15822 transitions. [2021-11-23 17:31:17,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:31:17,909 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 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 70 [2021-11-23 17:31:17,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:17,921 INFO L225 Difference]: With dead ends: 12647 [2021-11-23 17:31:17,921 INFO L226 Difference]: Without dead ends: 10186 [2021-11-23 17:31:17,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 66 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 17:31:17,926 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 228 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:17,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [228 Valid, 457 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:17,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10186 states. [2021-11-23 17:31:18,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10186 to 8469. [2021-11-23 17:31:18,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8469 states, 8468 states have (on average 1.2393717524799244) internal successors, (10495), 8468 states have internal predecessors, (10495), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:18,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8469 states to 8469 states and 10495 transitions. [2021-11-23 17:31:18,608 INFO L78 Accepts]: Start accepts. Automaton has 8469 states and 10495 transitions. Word has length 70 [2021-11-23 17:31:18,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:18,608 INFO L470 AbstractCegarLoop]: Abstraction has 8469 states and 10495 transitions. [2021-11-23 17:31:18,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 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 17:31:18,609 INFO L276 IsEmpty]: Start isEmpty. Operand 8469 states and 10495 transitions. [2021-11-23 17:31:18,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 17:31:18,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:18,611 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, 1, 1, 1] [2021-11-23 17:31:18,619 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Ended with exit code 0 [2021-11-23 17:31:18,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:18,811 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:18,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:18,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1908893001, now seen corresponding path program 1 times [2021-11-23 17:31:18,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:18,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1476470102] [2021-11-23 17:31:18,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:18,813 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:18,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:18,814 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:18,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:31:18,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:18,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:31:18,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:19,244 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 17:31:19,244 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:19,244 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:19,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1476470102] [2021-11-23 17:31:19,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1476470102] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:19,245 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:19,245 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:19,245 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971747693] [2021-11-23 17:31:19,245 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:19,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:31:19,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:19,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:31:19,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:31:19,247 INFO L87 Difference]: Start difference. First operand 8469 states and 10495 transitions. Second operand has 5 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:20,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:20,056 INFO L93 Difference]: Finished difference Result 12082 states and 15033 transitions. [2021-11-23 17:31:20,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:31:20,057 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 0 states have call successors, (0), 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 71 [2021-11-23 17:31:20,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:20,069 INFO L225 Difference]: With dead ends: 12082 [2021-11-23 17:31:20,069 INFO L226 Difference]: Without dead ends: 10121 [2021-11-23 17:31:20,074 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 67 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 17:31:20,074 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 218 mSDsluCounter, 324 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:20,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 496 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:31:20,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10121 states. [2021-11-23 17:31:20,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10121 to 9374. [2021-11-23 17:31:20,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9374 states, 9373 states have (on average 1.235036807852342) internal successors, (11576), 9373 states have internal predecessors, (11576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:20,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9374 states to 9374 states and 11576 transitions. [2021-11-23 17:31:20,902 INFO L78 Accepts]: Start accepts. Automaton has 9374 states and 11576 transitions. Word has length 71 [2021-11-23 17:31:20,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:20,902 INFO L470 AbstractCegarLoop]: Abstraction has 9374 states and 11576 transitions. [2021-11-23 17:31:20,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.8) internal successors, (69), 5 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:20,902 INFO L276 IsEmpty]: Start isEmpty. Operand 9374 states and 11576 transitions. [2021-11-23 17:31:20,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 17:31:20,904 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:20,905 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, 1, 1, 1] [2021-11-23 17:31:20,913 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Ended with exit code 0 [2021-11-23 17:31:21,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:21,105 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:21,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:21,106 INFO L85 PathProgramCache]: Analyzing trace with hash 132883246, now seen corresponding path program 1 times [2021-11-23 17:31:21,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:21,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1950380561] [2021-11-23 17:31:21,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:21,107 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:21,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:21,108 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:21,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-23 17:31:21,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:21,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:21,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:22,207 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 17:31:22,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:22,516 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 17:31:22,516 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:22,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1950380561] [2021-11-23 17:31:22,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1950380561] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:22,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [647162673] [2021-11-23 17:31:22,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:22,517 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:22,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:22,518 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:22,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-23 17:31:22,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:22,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:22,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:23,597 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 17:31:23,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:23,847 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 17:31:23,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [647162673] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:23,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534747277] [2021-11-23 17:31:23,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:23,848 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:23,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:23,849 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:23,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-23 17:31:23,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:23,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:23,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:25,000 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 17:31:25,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:25,269 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 17:31:25,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [534747277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:25,269 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:25,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:31:25,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743621323] [2021-11-23 17:31:25,270 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:25,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:31:25,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:25,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:31:25,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:31:25,271 INFO L87 Difference]: Start difference. First operand 9374 states and 11576 transitions. Second operand has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:26,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:26,366 INFO L93 Difference]: Finished difference Result 18054 states and 22260 transitions. [2021-11-23 17:31:26,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:31:26,366 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 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 71 [2021-11-23 17:31:26,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:26,378 INFO L225 Difference]: With dead ends: 18054 [2021-11-23 17:31:26,379 INFO L226 Difference]: Without dead ends: 10336 [2021-11-23 17:31:26,387 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 406 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:31:26,387 INFO L933 BasicCegarLoop]: 141 mSDtfsCounter, 240 mSDsluCounter, 836 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 977 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 167 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:26,388 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 977 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 157 Invalid, 0 Unknown, 167 Unchecked, 0.1s Time] [2021-11-23 17:31:26,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10336 states. [2021-11-23 17:31:27,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10336 to 9390. [2021-11-23 17:31:27,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9390 states, 9389 states have (on average 1.2342102460325914) internal successors, (11588), 9389 states have internal predecessors, (11588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:27,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9390 states to 9390 states and 11588 transitions. [2021-11-23 17:31:27,035 INFO L78 Accepts]: Start accepts. Automaton has 9390 states and 11588 transitions. Word has length 71 [2021-11-23 17:31:27,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:27,035 INFO L470 AbstractCegarLoop]: Abstraction has 9390 states and 11588 transitions. [2021-11-23 17:31:27,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:27,036 INFO L276 IsEmpty]: Start isEmpty. Operand 9390 states and 11588 transitions. [2021-11-23 17:31:27,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 17:31:27,038 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:27,038 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, 1, 1, 1] [2021-11-23 17:31:27,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:27,277 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2021-11-23 17:31:27,452 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (59)] Ended with exit code 0 [2021-11-23 17:31:27,651 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:27,651 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:27,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:27,652 INFO L85 PathProgramCache]: Analyzing trace with hash 484268997, now seen corresponding path program 1 times [2021-11-23 17:31:27,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:27,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1901909737] [2021-11-23 17:31:27,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:27,652 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:27,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:27,653 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:27,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2021-11-23 17:31:27,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:27,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:31:27,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:28,055 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 17:31:28,056 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:28,056 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:28,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1901909737] [2021-11-23 17:31:28,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1901909737] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:28,056 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:28,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:28,056 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390636883] [2021-11-23 17:31:28,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:28,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:31:28,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:28,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:31:28,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:31:28,057 INFO L87 Difference]: Start difference. First operand 9390 states and 11588 transitions. Second operand has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:28,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:28,896 INFO L93 Difference]: Finished difference Result 15531 states and 19303 transitions. [2021-11-23 17:31:28,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:31:28,897 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 0 states have call successors, (0), 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 71 [2021-11-23 17:31:28,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:28,910 INFO L225 Difference]: With dead ends: 15531 [2021-11-23 17:31:28,910 INFO L226 Difference]: Without dead ends: 10739 [2021-11-23 17:31:28,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 67 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 17:31:28,917 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 267 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:28,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [267 Valid, 405 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:28,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10739 states. [2021-11-23 17:31:29,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10739 to 9749. [2021-11-23 17:31:29,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9749 states, 9748 states have (on average 1.2244562987279441) internal successors, (11936), 9748 states have internal predecessors, (11936), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:29,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9749 states to 9749 states and 11936 transitions. [2021-11-23 17:31:29,671 INFO L78 Accepts]: Start accepts. Automaton has 9749 states and 11936 transitions. Word has length 71 [2021-11-23 17:31:29,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:29,672 INFO L470 AbstractCegarLoop]: Abstraction has 9749 states and 11936 transitions. [2021-11-23 17:31:29,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:29,672 INFO L276 IsEmpty]: Start isEmpty. Operand 9749 states and 11936 transitions. [2021-11-23 17:31:29,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-23 17:31:29,674 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:29,674 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, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:29,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:29,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:29,875 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:29,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:29,875 INFO L85 PathProgramCache]: Analyzing trace with hash -2092108085, now seen corresponding path program 1 times [2021-11-23 17:31:29,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:29,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1319363873] [2021-11-23 17:31:29,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:29,876 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:29,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:29,877 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:29,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-23 17:31:29,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:29,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:29,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:31,007 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 17:31:31,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:31,393 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 17:31:31,393 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:31,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1319363873] [2021-11-23 17:31:31,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1319363873] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:31,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [579314266] [2021-11-23 17:31:31,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:31,394 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:31,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:31,395 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:31,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-11-23 17:31:31,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:31,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:31,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:32,533 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 17:31:32,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:32,860 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 17:31:32,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [579314266] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:32,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033859730] [2021-11-23 17:31:32,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:32,861 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:32,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:32,862 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:32,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-23 17:31:32,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:32,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:32,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:34,120 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 17:31:34,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:34,485 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 17:31:34,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033859730] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:34,486 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:34,486 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:31:34,486 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367504421] [2021-11-23 17:31:34,486 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:34,487 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:31:34,487 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:34,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:31:34,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:31:34,488 INFO L87 Difference]: Start difference. First operand 9749 states and 11936 transitions. Second operand has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:35,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:35,430 INFO L93 Difference]: Finished difference Result 13016 states and 15863 transitions. [2021-11-23 17:31:35,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:31:35,431 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 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 74 [2021-11-23 17:31:35,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:35,441 INFO L225 Difference]: With dead ends: 13016 [2021-11-23 17:31:35,441 INFO L226 Difference]: Without dead ends: 10607 [2021-11-23 17:31:35,444 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 424 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:31:35,445 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 145 mSDsluCounter, 707 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 821 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 138 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:35,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 821 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 182 Invalid, 0 Unknown, 138 Unchecked, 0.1s Time] [2021-11-23 17:31:35,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10607 states. [2021-11-23 17:31:36,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10607 to 9764. [2021-11-23 17:31:36,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9764 states, 9763 states have (on average 1.2240090136228619) internal successors, (11950), 9763 states have internal predecessors, (11950), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:36,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9764 states to 9764 states and 11950 transitions. [2021-11-23 17:31:36,124 INFO L78 Accepts]: Start accepts. Automaton has 9764 states and 11950 transitions. Word has length 74 [2021-11-23 17:31:36,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:36,124 INFO L470 AbstractCegarLoop]: Abstraction has 9764 states and 11950 transitions. [2021-11-23 17:31:36,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:36,125 INFO L276 IsEmpty]: Start isEmpty. Operand 9764 states and 11950 transitions. [2021-11-23 17:31:36,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-23 17:31:36,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:36,127 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, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:36,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:36,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:36,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:36,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:36,732 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:36,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:36,732 INFO L85 PathProgramCache]: Analyzing trace with hash 261880279, now seen corresponding path program 1 times [2021-11-23 17:31:36,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:36,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1830263189] [2021-11-23 17:31:36,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:36,733 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:36,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:36,734 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:36,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-23 17:31:36,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:36,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:36,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:37,409 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 17:31:37,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:37,831 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 17:31:37,831 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:37,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1830263189] [2021-11-23 17:31:37,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1830263189] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:37,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1969107861] [2021-11-23 17:31:37,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:37,832 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:37,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:37,833 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:37,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-23 17:31:37,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:37,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:37,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:38,521 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 17:31:38,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:38,923 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 17:31:38,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1969107861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:38,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1134112615] [2021-11-23 17:31:38,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:38,923 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:38,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:38,925 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:38,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-23 17:31:38,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:38,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:31:38,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:39,570 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 17:31:39,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:39,974 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 17:31:39,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1134112615] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:39,975 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:39,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:31:39,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791649179] [2021-11-23 17:31:39,976 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:39,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:31:39,978 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:39,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:31:39,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:31:39,981 INFO L87 Difference]: Start difference. First operand 9764 states and 11950 transitions. Second operand has 16 states, 16 states have (on average 7.9375) internal successors, (127), 15 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:41,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:41,046 INFO L93 Difference]: Finished difference Result 17731 states and 21674 transitions. [2021-11-23 17:31:41,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:31:41,047 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.9375) internal successors, (127), 15 states have internal predecessors, (127), 0 states have call successors, (0), 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 74 [2021-11-23 17:31:41,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:41,063 INFO L225 Difference]: With dead ends: 17731 [2021-11-23 17:31:41,063 INFO L226 Difference]: Without dead ends: 12660 [2021-11-23 17:31:41,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 424 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:31:41,069 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 176 mSDsluCounter, 924 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 1050 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 218 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:41,069 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [176 Valid, 1050 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 185 Invalid, 0 Unknown, 218 Unchecked, 0.1s Time] [2021-11-23 17:31:41,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12660 states. [2021-11-23 17:31:41,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12660 to 9774. [2021-11-23 17:31:41,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9774 states, 9773 states have (on average 1.2234728333162797) internal successors, (11957), 9773 states have internal predecessors, (11957), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:41,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9774 states to 9774 states and 11957 transitions. [2021-11-23 17:31:41,827 INFO L78 Accepts]: Start accepts. Automaton has 9774 states and 11957 transitions. Word has length 74 [2021-11-23 17:31:41,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:41,827 INFO L470 AbstractCegarLoop]: Abstraction has 9774 states and 11957 transitions. [2021-11-23 17:31:41,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.9375) internal successors, (127), 15 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:41,827 INFO L276 IsEmpty]: Start isEmpty. Operand 9774 states and 11957 transitions. [2021-11-23 17:31:41,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-23 17:31:41,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:41,829 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, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:41,837 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Ended with exit code 0 [2021-11-23 17:31:42,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:42,254 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-11-23 17:31:42,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:42,430 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:42,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:42,431 INFO L85 PathProgramCache]: Analyzing trace with hash -132486507, now seen corresponding path program 1 times [2021-11-23 17:31:42,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:42,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1907812912] [2021-11-23 17:31:42,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:42,432 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:42,432 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:42,435 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:42,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 17:31:42,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:42,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:31:42,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:42,834 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 17:31:42,834 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:42,834 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:42,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1907812912] [2021-11-23 17:31:42,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1907812912] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:42,834 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:42,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:31:42,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660116908] [2021-11-23 17:31:42,835 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:42,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:31:42,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:42,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:31:42,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:42,836 INFO L87 Difference]: Start difference. First operand 9774 states and 11957 transitions. Second operand has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 5 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:43,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:43,485 INFO L93 Difference]: Finished difference Result 12600 states and 15446 transitions. [2021-11-23 17:31:43,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:31:43,485 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 5 states have internal predecessors, (71), 0 states have call successors, (0), 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 74 [2021-11-23 17:31:43,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:43,497 INFO L225 Difference]: With dead ends: 12600 [2021-11-23 17:31:43,497 INFO L226 Difference]: Without dead ends: 9745 [2021-11-23 17:31:43,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:31:43,502 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 27 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:43,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 307 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 54 Unchecked, 0.0s Time] [2021-11-23 17:31:43,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9745 states. [2021-11-23 17:31:44,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9745 to 9745. [2021-11-23 17:31:44,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9745 states, 9744 states have (on average 1.2233169129720853) internal successors, (11920), 9744 states have internal predecessors, (11920), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:44,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9745 states to 9745 states and 11920 transitions. [2021-11-23 17:31:44,261 INFO L78 Accepts]: Start accepts. Automaton has 9745 states and 11920 transitions. Word has length 74 [2021-11-23 17:31:44,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:44,261 INFO L470 AbstractCegarLoop]: Abstraction has 9745 states and 11920 transitions. [2021-11-23 17:31:44,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 5 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:44,262 INFO L276 IsEmpty]: Start isEmpty. Operand 9745 states and 11920 transitions. [2021-11-23 17:31:44,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 17:31:44,263 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:44,264 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:44,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:44,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:44,464 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:44,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:44,465 INFO L85 PathProgramCache]: Analyzing trace with hash -263630000, now seen corresponding path program 1 times [2021-11-23 17:31:44,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:44,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1370316876] [2021-11-23 17:31:44,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:44,465 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:44,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:44,467 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:44,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 17:31:44,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:44,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:31:44,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:44,648 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 17:31:44,648 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:44,648 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:44,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1370316876] [2021-11-23 17:31:44,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1370316876] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:44,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:44,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:31:44,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501316220] [2021-11-23 17:31:44,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:44,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:44,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:44,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:44,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:44,650 INFO L87 Difference]: Start difference. First operand 9745 states and 11920 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:45,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:45,782 INFO L93 Difference]: Finished difference Result 19387 states and 23681 transitions. [2021-11-23 17:31:45,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:45,782 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 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 75 [2021-11-23 17:31:45,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:45,801 INFO L225 Difference]: With dead ends: 19387 [2021-11-23 17:31:45,801 INFO L226 Difference]: Without dead ends: 15959 [2021-11-23 17:31:45,805 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:45,806 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 59 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:45,807 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 175 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:45,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15959 states. [2021-11-23 17:31:46,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15959 to 10656. [2021-11-23 17:31:46,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10656 states, 10655 states have (on average 1.2165180666353825) internal successors, (12962), 10655 states have internal predecessors, (12962), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:46,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10656 states to 10656 states and 12962 transitions. [2021-11-23 17:31:46,705 INFO L78 Accepts]: Start accepts. Automaton has 10656 states and 12962 transitions. Word has length 75 [2021-11-23 17:31:46,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:46,706 INFO L470 AbstractCegarLoop]: Abstraction has 10656 states and 12962 transitions. [2021-11-23 17:31:46,706 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:46,706 INFO L276 IsEmpty]: Start isEmpty. Operand 10656 states and 12962 transitions. [2021-11-23 17:31:46,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 17:31:46,708 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:46,708 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:46,716 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:46,908 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:46,909 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:46,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:46,909 INFO L85 PathProgramCache]: Analyzing trace with hash -1701905324, now seen corresponding path program 1 times [2021-11-23 17:31:46,909 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:46,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [100574528] [2021-11-23 17:31:46,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:46,910 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:46,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:46,910 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:46,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (70)] Waiting until timeout for monitored process [2021-11-23 17:31:46,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:46,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:31:46,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:47,072 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:47,072 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:47,072 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:47,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [100574528] [2021-11-23 17:31:47,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [100574528] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:47,073 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:31:47,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:31:47,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292612814] [2021-11-23 17:31:47,073 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:47,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:47,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:47,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:47,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:47,074 INFO L87 Difference]: Start difference. First operand 10656 states and 12962 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:47,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:47,598 INFO L93 Difference]: Finished difference Result 11889 states and 14397 transitions. [2021-11-23 17:31:47,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:47,598 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 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 75 [2021-11-23 17:31:47,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:47,609 INFO L225 Difference]: With dead ends: 11889 [2021-11-23 17:31:47,609 INFO L226 Difference]: Without dead ends: 8185 [2021-11-23 17:31:47,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:31:47,614 INFO L933 BasicCegarLoop]: 159 mSDtfsCounter, 50 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:47,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 238 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:47,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8185 states. [2021-11-23 17:31:48,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8185 to 8183. [2021-11-23 17:31:48,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8183 states, 8182 states have (on average 1.2015399657785382) internal successors, (9831), 8182 states have internal predecessors, (9831), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:48,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8183 states to 8183 states and 9831 transitions. [2021-11-23 17:31:48,227 INFO L78 Accepts]: Start accepts. Automaton has 8183 states and 9831 transitions. Word has length 75 [2021-11-23 17:31:48,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:48,228 INFO L470 AbstractCegarLoop]: Abstraction has 8183 states and 9831 transitions. [2021-11-23 17:31:48,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:48,228 INFO L276 IsEmpty]: Start isEmpty. Operand 8183 states and 9831 transitions. [2021-11-23 17:31:48,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 17:31:48,229 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:48,230 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:48,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:48,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:31:48,441 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:48,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:48,442 INFO L85 PathProgramCache]: Analyzing trace with hash 1982250411, now seen corresponding path program 1 times [2021-11-23 17:31:48,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:48,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [636531863] [2021-11-23 17:31:48,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:48,442 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:48,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:48,443 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:48,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-23 17:31:48,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:48,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:31:48,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:50,704 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 17:31:50,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:51,937 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 17:31:51,937 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:51,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [636531863] [2021-11-23 17:31:51,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [636531863] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:51,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1536916490] [2021-11-23 17:31:51,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:51,937 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:51,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:51,938 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:51,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-23 17:31:52,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:52,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:31:52,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:54,362 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 17:31:54,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:55,097 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 17:31:55,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1536916490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:55,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498117651] [2021-11-23 17:31:55,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:55,098 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:55,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:55,105 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:55,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-23 17:31:55,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:55,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:31:55,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:58,040 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 17:31:58,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:58,908 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 17:31:58,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1498117651] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:58,908 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:58,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 20, 18, 18, 18] total 55 [2021-11-23 17:31:58,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631097087] [2021-11-23 17:31:58,909 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:58,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:31:58,909 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:58,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:31:58,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=2600, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:31:58,911 INFO L87 Difference]: Start difference. First operand 8183 states and 9831 transitions. Second operand has 55 states, 55 states have (on average 3.981818181818182) internal successors, (219), 55 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:00,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:00,436 INFO L93 Difference]: Finished difference Result 11135 states and 13272 transitions. [2021-11-23 17:32:00,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:32:00,437 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.981818181818182) internal successors, (219), 55 states have internal predecessors, (219), 0 states have call successors, (0), 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 76 [2021-11-23 17:32:00,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:00,446 INFO L225 Difference]: With dead ends: 11135 [2021-11-23 17:32:00,446 INFO L226 Difference]: Without dead ends: 9909 [2021-11-23 17:32:00,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 463 GetRequests, 399 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1652 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=600, Invalid=3690, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 17:32:00,450 INFO L933 BasicCegarLoop]: 157 mSDtfsCounter, 755 mSDsluCounter, 3720 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 755 SdHoareTripleChecker+Valid, 3877 SdHoareTripleChecker+Invalid, 1049 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 682 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:00,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [755 Valid, 3877 Invalid, 1049 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 343 Invalid, 0 Unknown, 682 Unchecked, 0.3s Time] [2021-11-23 17:32:00,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9909 states. [2021-11-23 17:32:01,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9909 to 7972. [2021-11-23 17:32:01,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7972 states, 7971 states have (on average 1.2008530924601681) internal successors, (9572), 7971 states have internal predecessors, (9572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:01,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7972 states to 7972 states and 9572 transitions. [2021-11-23 17:32:01,012 INFO L78 Accepts]: Start accepts. Automaton has 7972 states and 9572 transitions. Word has length 76 [2021-11-23 17:32:01,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:01,013 INFO L470 AbstractCegarLoop]: Abstraction has 7972 states and 9572 transitions. [2021-11-23 17:32:01,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.981818181818182) internal successors, (219), 55 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:01,013 INFO L276 IsEmpty]: Start isEmpty. Operand 7972 states and 9572 transitions. [2021-11-23 17:32:01,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 17:32:01,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:01,015 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:01,016 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:01,221 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:01,434 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2021-11-23 17:32:01,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:01,616 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:01,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:01,616 INFO L85 PathProgramCache]: Analyzing trace with hash -370370873, now seen corresponding path program 1 times [2021-11-23 17:32:01,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:01,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1669238267] [2021-11-23 17:32:01,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:01,616 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:01,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:01,617 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:01,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-23 17:32:01,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:01,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:32:01,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:03,848 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 17:32:03,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:05,210 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 17:32:05,210 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:05,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1669238267] [2021-11-23 17:32:05,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1669238267] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:05,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [11428542] [2021-11-23 17:32:05,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:05,211 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:05,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:05,211 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:05,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-23 17:32:05,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:05,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:32:05,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:07,154 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 17:32:07,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:07,795 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 17:32:07,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [11428542] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:07,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622430304] [2021-11-23 17:32:07,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:07,796 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:07,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:07,796 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:07,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-23 17:32:07,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:07,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:32:07,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:10,472 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 17:32:10,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:11,568 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 17:32:11,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622430304] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:11,569 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:11,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 21, 20, 18, 17] total 55 [2021-11-23 17:32:11,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118984569] [2021-11-23 17:32:11,569 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:11,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:32:11,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:11,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:32:11,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=2613, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:32:11,571 INFO L87 Difference]: Start difference. First operand 7972 states and 9572 transitions. Second operand has 55 states, 55 states have (on average 3.909090909090909) internal successors, (215), 55 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:13,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:13,683 INFO L93 Difference]: Finished difference Result 10537 states and 12557 transitions. [2021-11-23 17:32:13,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-23 17:32:13,683 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.909090909090909) internal successors, (215), 55 states have internal predecessors, (215), 0 states have call successors, (0), 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 76 [2021-11-23 17:32:13,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:13,692 INFO L225 Difference]: With dead ends: 10537 [2021-11-23 17:32:13,692 INFO L226 Difference]: Without dead ends: 9859 [2021-11-23 17:32:13,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 398 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1478 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=748, Invalid=4082, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:32:13,696 INFO L933 BasicCegarLoop]: 168 mSDtfsCounter, 825 mSDsluCounter, 4038 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 825 SdHoareTripleChecker+Valid, 4206 SdHoareTripleChecker+Invalid, 1169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 745 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:13,696 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [825 Valid, 4206 Invalid, 1169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 405 Invalid, 0 Unknown, 745 Unchecked, 0.4s Time] [2021-11-23 17:32:13,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9859 states. [2021-11-23 17:32:14,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9859 to 7979. [2021-11-23 17:32:14,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7979 states, 7978 states have (on average 1.2009275507646027) internal successors, (9581), 7978 states have internal predecessors, (9581), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:14,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7979 states to 7979 states and 9581 transitions. [2021-11-23 17:32:14,186 INFO L78 Accepts]: Start accepts. Automaton has 7979 states and 9581 transitions. Word has length 76 [2021-11-23 17:32:14,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:14,186 INFO L470 AbstractCegarLoop]: Abstraction has 7979 states and 9581 transitions. [2021-11-23 17:32:14,187 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.909090909090909) internal successors, (215), 55 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:14,187 INFO L276 IsEmpty]: Start isEmpty. Operand 7979 states and 9581 transitions. [2021-11-23 17:32:14,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 17:32:14,188 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:14,188 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:14,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:14,410 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Ended with exit code 0 [2021-11-23 17:32:14,600 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Ended with exit code 0 [2021-11-23 17:32:14,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:14,794 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:14,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:14,795 INFO L85 PathProgramCache]: Analyzing trace with hash -506137173, now seen corresponding path program 1 times [2021-11-23 17:32:14,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:14,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1467734666] [2021-11-23 17:32:14,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:14,795 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:14,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:14,796 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:14,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-23 17:32:14,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:14,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:32:14,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:14,939 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 17:32:14,939 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:32:14,940 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:14,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1467734666] [2021-11-23 17:32:14,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1467734666] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:32:14,940 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:32:14,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:32:14,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034288833] [2021-11-23 17:32:14,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:32:14,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:32:14,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:14,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:32:14,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:32:14,941 INFO L87 Difference]: Start difference. First operand 7979 states and 9581 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:15,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:15,665 INFO L93 Difference]: Finished difference Result 14926 states and 17952 transitions. [2021-11-23 17:32:15,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:32:15,665 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 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 76 [2021-11-23 17:32:15,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:15,675 INFO L225 Difference]: With dead ends: 14926 [2021-11-23 17:32:15,675 INFO L226 Difference]: Without dead ends: 11844 [2021-11-23 17:32:15,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:32:15,678 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 65 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:15,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 169 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:32:15,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11844 states. [2021-11-23 17:32:16,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11844 to 8420. [2021-11-23 17:32:16,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8420 states, 8419 states have (on average 1.1914716712198599) internal successors, (10031), 8419 states have internal predecessors, (10031), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:16,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8420 states to 8420 states and 10031 transitions. [2021-11-23 17:32:16,220 INFO L78 Accepts]: Start accepts. Automaton has 8420 states and 10031 transitions. Word has length 76 [2021-11-23 17:32:16,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:16,220 INFO L470 AbstractCegarLoop]: Abstraction has 8420 states and 10031 transitions. [2021-11-23 17:32:16,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:16,220 INFO L276 IsEmpty]: Start isEmpty. Operand 8420 states and 10031 transitions. [2021-11-23 17:32:16,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 17:32:16,222 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:16,222 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:16,229 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Ended with exit code 0 [2021-11-23 17:32:16,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:16,423 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:16,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:16,423 INFO L85 PathProgramCache]: Analyzing trace with hash -1932369956, now seen corresponding path program 1 times [2021-11-23 17:32:16,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:16,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [501979705] [2021-11-23 17:32:16,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:16,424 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:16,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:16,425 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:16,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Waiting until timeout for monitored process [2021-11-23 17:32:16,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:16,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:32:16,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:18,842 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 17:32:18,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:20,524 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 17:32:20,524 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:20,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [501979705] [2021-11-23 17:32:20,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [501979705] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:20,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [694034097] [2021-11-23 17:32:20,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:20,525 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:20,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:20,526 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:20,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Waiting until timeout for monitored process [2021-11-23 17:32:20,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:20,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:32:20,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:23,037 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 17:32:23,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:24,623 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 17:32:24,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [694034097] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:24,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807910621] [2021-11-23 17:32:24,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:24,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:24,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:24,625 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:24,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-23 17:32:24,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:24,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:32:24,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:28,375 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 17:32:28,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:29,441 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 17:32:29,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807910621] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:29,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:29,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 22, 20, 16, 15] total 72 [2021-11-23 17:32:29,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119514800] [2021-11-23 17:32:29,442 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:29,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-23 17:32:29,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:29,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-23 17:32:29,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=696, Invalid=4416, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 17:32:29,445 INFO L87 Difference]: Start difference. First operand 8420 states and 10031 transitions. Second operand has 72 states, 72 states have (on average 3.9305555555555554) internal successors, (283), 72 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:35,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:35,693 INFO L93 Difference]: Finished difference Result 13024 states and 15360 transitions. [2021-11-23 17:32:35,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-23 17:32:35,694 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.9305555555555554) internal successors, (283), 72 states have internal predecessors, (283), 0 states have call successors, (0), 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 77 [2021-11-23 17:32:35,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:35,706 INFO L225 Difference]: With dead ends: 13024 [2021-11-23 17:32:35,706 INFO L226 Difference]: Without dead ends: 12044 [2021-11-23 17:32:35,713 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 391 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4182 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=1757, Invalid=9799, Unknown=0, NotChecked=0, Total=11556 [2021-11-23 17:32:35,713 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 2033 mSDsluCounter, 8475 mSDsCounter, 0 mSdLazyCounter, 2774 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2033 SdHoareTripleChecker+Valid, 8686 SdHoareTripleChecker+Invalid, 3540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 2774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 604 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:35,714 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2033 Valid, 8686 Invalid, 3540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 2774 Invalid, 0 Unknown, 604 Unchecked, 2.6s Time] [2021-11-23 17:32:35,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12044 states. [2021-11-23 17:32:36,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12044 to 8314. [2021-11-23 17:32:36,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8314 states, 8313 states have (on average 1.1913869842415494) internal successors, (9904), 8313 states have internal predecessors, (9904), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:36,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8314 states to 8314 states and 9904 transitions. [2021-11-23 17:32:36,369 INFO L78 Accepts]: Start accepts. Automaton has 8314 states and 9904 transitions. Word has length 77 [2021-11-23 17:32:36,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:36,369 INFO L470 AbstractCegarLoop]: Abstraction has 8314 states and 9904 transitions. [2021-11-23 17:32:36,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 3.9305555555555554) internal successors, (283), 72 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:36,370 INFO L276 IsEmpty]: Start isEmpty. Operand 8314 states and 9904 transitions. [2021-11-23 17:32:36,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-23 17:32:36,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:36,371 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:36,392 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Ended with exit code 0 [2021-11-23 17:32:36,578 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Ended with exit code 0 [2021-11-23 17:32:36,773 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Ended with exit code 0 [2021-11-23 17:32:36,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:36,972 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:36,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:36,973 INFO L85 PathProgramCache]: Analyzing trace with hash -631369199, now seen corresponding path program 2 times [2021-11-23 17:32:36,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:36,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [813919882] [2021-11-23 17:32:36,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:32:36,973 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:36,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:36,974 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:36,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Waiting until timeout for monitored process [2021-11-23 17:32:37,033 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:32:37,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:32:37,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:32:37,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:37,302 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:32:37,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:37,473 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:32:37,473 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:37,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [813919882] [2021-11-23 17:32:37,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [813919882] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:37,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1779145960] [2021-11-23 17:32:37,473 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:32:37,473 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:37,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:37,475 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:37,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Waiting until timeout for monitored process [2021-11-23 17:32:37,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:32:37,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:32:37,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:32:37,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:37,705 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:32:37,705 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:32:37,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1779145960] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:32:37,705 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:32:37,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:32:37,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411737359] [2021-11-23 17:32:37,706 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:32:37,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:32:37,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:37,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:32:37,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:32:37,707 INFO L87 Difference]: Start difference. First operand 8314 states and 9904 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:38,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:38,264 INFO L93 Difference]: Finished difference Result 15766 states and 18816 transitions. [2021-11-23 17:32:38,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:32:38,264 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 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 89 [2021-11-23 17:32:38,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:38,272 INFO L225 Difference]: With dead ends: 15766 [2021-11-23 17:32:38,272 INFO L226 Difference]: Without dead ends: 8438 [2021-11-23 17:32:38,277 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 260 SyntacticMatches, 0 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 17:32:38,278 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 49 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:38,278 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 182 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:32:38,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8438 states. [2021-11-23 17:32:38,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8438 to 8098. [2021-11-23 17:32:38,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8098 states, 8097 states have (on average 1.1873533407434853) internal successors, (9614), 8097 states have internal predecessors, (9614), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:38,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8098 states to 8098 states and 9614 transitions. [2021-11-23 17:32:38,905 INFO L78 Accepts]: Start accepts. Automaton has 8098 states and 9614 transitions. Word has length 89 [2021-11-23 17:32:38,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:38,906 INFO L470 AbstractCegarLoop]: Abstraction has 8098 states and 9614 transitions. [2021-11-23 17:32:38,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:38,906 INFO L276 IsEmpty]: Start isEmpty. Operand 8098 states and 9614 transitions. [2021-11-23 17:32:38,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 17:32:38,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:38,909 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:38,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:39,121 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Ended with exit code 0 [2021-11-23 17:32:39,320 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:39,321 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:39,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:39,321 INFO L85 PathProgramCache]: Analyzing trace with hash 2121812159, now seen corresponding path program 1 times [2021-11-23 17:32:39,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:39,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [217500485] [2021-11-23 17:32:39,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:39,322 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:39,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:39,323 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:39,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-23 17:32:39,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:39,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:32:39,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:40,666 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 24 proven. 48 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:32:40,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:41,037 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 24 proven. 48 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:32:41,037 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:41,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [217500485] [2021-11-23 17:32:41,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [217500485] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:41,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1386458472] [2021-11-23 17:32:41,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:41,038 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:41,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:41,039 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:41,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-23 17:32:41,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:41,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:32:41,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:42,502 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 24 proven. 48 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:32:42,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:42,844 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 24 proven. 48 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:32:42,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1386458472] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:42,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446779588] [2021-11-23 17:32:42,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:42,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:42,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:42,846 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:42,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-23 17:32:42,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:42,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:32:42,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:44,538 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 24 proven. 48 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:32:44,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:44,909 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 24 proven. 48 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:32:44,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446779588] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:44,910 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:44,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:32:44,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683491844] [2021-11-23 17:32:44,910 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:44,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:32:44,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:44,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:32:44,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:32:44,911 INFO L87 Difference]: Start difference. First operand 8098 states and 9614 transitions. Second operand has 16 states, 16 states have (on average 12.8125) internal successors, (205), 15 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:45,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:45,759 INFO L93 Difference]: Finished difference Result 10763 states and 12805 transitions. [2021-11-23 17:32:45,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:32:45,759 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 12.8125) internal successors, (205), 15 states have internal predecessors, (205), 0 states have call successors, (0), 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 121 [2021-11-23 17:32:45,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:45,766 INFO L225 Difference]: With dead ends: 10763 [2021-11-23 17:32:45,767 INFO L226 Difference]: Without dead ends: 8777 [2021-11-23 17:32:45,769 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 728 GetRequests, 708 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:32:45,770 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 155 mSDsluCounter, 1062 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 1197 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:45,770 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 1197 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 82 Invalid, 0 Unknown, 86 Unchecked, 0.1s Time] [2021-11-23 17:32:45,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8777 states. [2021-11-23 17:32:46,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8777 to 8609. [2021-11-23 17:32:46,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8609 states, 8608 states have (on average 1.1876161710037174) internal successors, (10223), 8608 states have internal predecessors, (10223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:46,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8609 states to 8609 states and 10223 transitions. [2021-11-23 17:32:46,387 INFO L78 Accepts]: Start accepts. Automaton has 8609 states and 10223 transitions. Word has length 121 [2021-11-23 17:32:46,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:46,388 INFO L470 AbstractCegarLoop]: Abstraction has 8609 states and 10223 transitions. [2021-11-23 17:32:46,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 12.8125) internal successors, (205), 15 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:46,388 INFO L276 IsEmpty]: Start isEmpty. Operand 8609 states and 10223 transitions. [2021-11-23 17:32:46,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 17:32:46,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:46,392 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:46,400 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Ended with exit code 0 [2021-11-23 17:32:46,612 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Ended with exit code 0 [2021-11-23 17:32:46,794 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Ended with exit code 0 [2021-11-23 17:32:46,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:46,993 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:46,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:46,993 INFO L85 PathProgramCache]: Analyzing trace with hash 2049425601, now seen corresponding path program 1 times [2021-11-23 17:32:46,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:46,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1002057231] [2021-11-23 17:32:46,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:46,994 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:46,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:46,995 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:46,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:32:47,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:47,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:32:47,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:48,620 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 51 proven. 35 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:32:48,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:49,138 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 51 proven. 35 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:32:49,139 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:49,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1002057231] [2021-11-23 17:32:49,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1002057231] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:49,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [743442342] [2021-11-23 17:32:49,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:49,139 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:49,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:49,140 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:49,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 17:32:49,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:49,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 17:32:49,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:49,674 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 76 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:32:49,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:49,904 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 76 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:32:49,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [743442342] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:49,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267701015] [2021-11-23 17:32:49,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:49,905 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:49,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:49,906 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:49,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 17:32:49,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:49,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:32:49,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:50,588 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 52 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:32:50,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:51,114 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 52 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:32:51,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267701015] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:51,115 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:51,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 6, 6, 7, 7] total 38 [2021-11-23 17:32:51,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352055079] [2021-11-23 17:32:51,115 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:51,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 17:32:51,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:51,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 17:32:51,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1283, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 17:32:51,117 INFO L87 Difference]: Start difference. First operand 8609 states and 10223 transitions. Second operand has 38 states, 38 states have (on average 15.710526315789474) internal successors, (597), 38 states have internal predecessors, (597), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:58,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:58,410 INFO L93 Difference]: Finished difference Result 33677 states and 39888 transitions. [2021-11-23 17:32:58,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-11-23 17:32:58,410 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 15.710526315789474) internal successors, (597), 38 states have internal predecessors, (597), 0 states have call successors, (0), 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 121 [2021-11-23 17:32:58,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:58,440 INFO L225 Difference]: With dead ends: 33677 [2021-11-23 17:32:58,441 INFO L226 Difference]: Without dead ends: 26729 [2021-11-23 17:32:58,455 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 940 GetRequests, 782 SyntacticMatches, 8 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7568 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=2087, Invalid=20865, Unknown=0, NotChecked=0, Total=22952 [2021-11-23 17:32:58,455 INFO L933 BasicCegarLoop]: 352 mSDtfsCounter, 1209 mSDsluCounter, 5765 mSDsCounter, 0 mSdLazyCounter, 1828 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1209 SdHoareTripleChecker+Valid, 6117 SdHoareTripleChecker+Invalid, 2895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 1828 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 965 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:58,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1209 Valid, 6117 Invalid, 2895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 1828 Invalid, 0 Unknown, 965 Unchecked, 1.1s Time] [2021-11-23 17:32:58,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26729 states. [2021-11-23 17:32:59,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26729 to 13847. [2021-11-23 17:32:59,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13847 states, 13846 states have (on average 1.1880687563195147) internal successors, (16450), 13846 states have internal predecessors, (16450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:59,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13847 states to 13847 states and 16450 transitions. [2021-11-23 17:32:59,655 INFO L78 Accepts]: Start accepts. Automaton has 13847 states and 16450 transitions. Word has length 121 [2021-11-23 17:32:59,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:59,655 INFO L470 AbstractCegarLoop]: Abstraction has 13847 states and 16450 transitions. [2021-11-23 17:32:59,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 15.710526315789474) internal successors, (597), 38 states have internal predecessors, (597), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:59,655 INFO L276 IsEmpty]: Start isEmpty. Operand 13847 states and 16450 transitions. [2021-11-23 17:32:59,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 17:32:59,660 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:59,660 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:59,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:59,868 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:00,081 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2021-11-23 17:33:00,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:00,261 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:00,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:00,262 INFO L85 PathProgramCache]: Analyzing trace with hash 750004861, now seen corresponding path program 1 times [2021-11-23 17:33:00,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:00,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [610085205] [2021-11-23 17:33:00,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:00,262 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:00,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:00,263 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:00,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 17:33:00,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:00,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:33:00,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:00,948 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:33:00,949 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:33:00,949 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:00,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [610085205] [2021-11-23 17:33:00,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [610085205] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:33:00,949 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:33:00,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:33:00,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565309902] [2021-11-23 17:33:00,949 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:33:00,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:33:00,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:00,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:33:00,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:33:00,950 INFO L87 Difference]: Start difference. First operand 13847 states and 16450 transitions. Second operand has 6 states, 6 states have (on average 19.0) internal successors, (114), 5 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:02,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:02,365 INFO L93 Difference]: Finished difference Result 26685 states and 31789 transitions. [2021-11-23 17:33:02,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:33:02,366 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 19.0) internal successors, (114), 5 states have internal predecessors, (114), 0 states have call successors, (0), 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 121 [2021-11-23 17:33:02,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:02,385 INFO L225 Difference]: With dead ends: 26685 [2021-11-23 17:33:02,385 INFO L226 Difference]: Without dead ends: 18729 [2021-11-23 17:33:02,390 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:33:02,391 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 132 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 57 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:02,391 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 310 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 57 Unchecked, 0.0s Time] [2021-11-23 17:33:02,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18729 states. [2021-11-23 17:33:03,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18729 to 18485. [2021-11-23 17:33:03,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18485 states, 18484 states have (on average 1.1877299285868859) internal successors, (21954), 18484 states have internal predecessors, (21954), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:03,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18485 states to 18485 states and 21954 transitions. [2021-11-23 17:33:03,888 INFO L78 Accepts]: Start accepts. Automaton has 18485 states and 21954 transitions. Word has length 121 [2021-11-23 17:33:03,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:03,888 INFO L470 AbstractCegarLoop]: Abstraction has 18485 states and 21954 transitions. [2021-11-23 17:33:03,888 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 19.0) internal successors, (114), 5 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:03,889 INFO L276 IsEmpty]: Start isEmpty. Operand 18485 states and 21954 transitions. [2021-11-23 17:33:03,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 17:33:03,895 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:03,895 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:03,902 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Ended with exit code 0 [2021-11-23 17:33:04,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:33:04,096 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:04,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:04,096 INFO L85 PathProgramCache]: Analyzing trace with hash -244882435, now seen corresponding path program 1 times [2021-11-23 17:33:04,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:04,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [248098913] [2021-11-23 17:33:04,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:04,097 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:04,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:04,097 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:04,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Waiting until timeout for monitored process [2021-11-23 17:33:04,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:04,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:33:04,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:04,803 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 17:33:04,803 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:33:04,804 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:04,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [248098913] [2021-11-23 17:33:04,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [248098913] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:33:04,804 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:33:04,804 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:33:04,804 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950620845] [2021-11-23 17:33:04,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:33:04,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:33:04,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:04,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:33:04,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:33:04,805 INFO L87 Difference]: Start difference. First operand 18485 states and 21954 transitions. Second operand has 6 states, 6 states have (on average 18.833333333333332) internal successors, (113), 5 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:06,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:06,485 INFO L93 Difference]: Finished difference Result 27222 states and 32305 transitions. [2021-11-23 17:33:06,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:33:06,485 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.833333333333332) internal successors, (113), 5 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 121 [2021-11-23 17:33:06,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:06,507 INFO L225 Difference]: With dead ends: 27222 [2021-11-23 17:33:06,507 INFO L226 Difference]: Without dead ends: 22272 [2021-11-23 17:33:06,513 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:33:06,513 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 82 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 56 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:06,514 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 347 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 56 Unchecked, 0.0s Time] [2021-11-23 17:33:06,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22272 states. [2021-11-23 17:33:08,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22272 to 21911. [2021-11-23 17:33:08,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21911 states, 21910 states have (on average 1.184481971702419) internal successors, (25952), 21910 states have internal predecessors, (25952), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:08,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21911 states to 21911 states and 25952 transitions. [2021-11-23 17:33:08,304 INFO L78 Accepts]: Start accepts. Automaton has 21911 states and 25952 transitions. Word has length 121 [2021-11-23 17:33:08,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:08,305 INFO L470 AbstractCegarLoop]: Abstraction has 21911 states and 25952 transitions. [2021-11-23 17:33:08,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.833333333333332) internal successors, (113), 5 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:08,305 INFO L276 IsEmpty]: Start isEmpty. Operand 21911 states and 25952 transitions. [2021-11-23 17:33:08,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 17:33:08,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:08,311 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:08,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:08,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:33:08,512 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:08,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:08,512 INFO L85 PathProgramCache]: Analyzing trace with hash 1664435045, now seen corresponding path program 2 times [2021-11-23 17:33:08,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:08,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1708666337] [2021-11-23 17:33:08,513 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:33:08,513 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:08,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:08,514 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:08,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Waiting until timeout for monitored process [2021-11-23 17:33:08,578 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:33:08,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:33:08,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:33:08,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:09,365 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 57 proven. 4 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:33:09,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:09,694 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 57 proven. 4 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:33:09,694 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:09,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1708666337] [2021-11-23 17:33:09,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1708666337] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:09,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1709575425] [2021-11-23 17:33:09,695 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:33:09,695 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:09,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:09,696 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:09,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Waiting until timeout for monitored process [2021-11-23 17:33:09,815 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:33:09,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:33:09,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:33:09,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:10,595 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 57 proven. 4 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:33:10,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:10,894 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 57 proven. 4 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:33:10,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1709575425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:10,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333671111] [2021-11-23 17:33:10,894 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:33:10,894 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:10,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:10,895 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:10,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2021-11-23 17:33:10,956 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:33:10,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:33:10,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:33:10,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:11,732 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 57 proven. 4 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:33:11,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:11,998 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 57 proven. 4 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 17:33:11,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333671111] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:11,998 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:11,998 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:33:11,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448571039] [2021-11-23 17:33:11,999 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:11,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:33:11,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:12,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:33:12,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:33:12,000 INFO L87 Difference]: Start difference. First operand 21911 states and 25952 transitions. Second operand has 16 states, 16 states have (on average 10.0) internal successors, (160), 15 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:13,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:13,727 INFO L93 Difference]: Finished difference Result 25624 states and 30370 transitions. [2021-11-23 17:33:13,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:33:13,728 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.0) internal successors, (160), 15 states have internal predecessors, (160), 0 states have call successors, (0), 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 121 [2021-11-23 17:33:13,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:13,748 INFO L225 Difference]: With dead ends: 25624 [2021-11-23 17:33:13,749 INFO L226 Difference]: Without dead ends: 21874 [2021-11-23 17:33:13,753 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 723 GetRequests, 706 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:33:13,754 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 110 mSDsluCounter, 846 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 967 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 89 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:13,754 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 967 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 0 Unknown, 89 Unchecked, 0.1s Time] [2021-11-23 17:33:13,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21874 states. [2021-11-23 17:33:15,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21874 to 21874. [2021-11-23 17:33:15,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21874 states, 21873 states have (on average 1.1846111644493211) internal successors, (25911), 21873 states have internal predecessors, (25911), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:15,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21874 states to 21874 states and 25911 transitions. [2021-11-23 17:33:15,552 INFO L78 Accepts]: Start accepts. Automaton has 21874 states and 25911 transitions. Word has length 121 [2021-11-23 17:33:15,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:15,553 INFO L470 AbstractCegarLoop]: Abstraction has 21874 states and 25911 transitions. [2021-11-23 17:33:15,553 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.0) internal successors, (160), 15 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:15,553 INFO L276 IsEmpty]: Start isEmpty. Operand 21874 states and 25911 transitions. [2021-11-23 17:33:15,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 17:33:15,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:15,563 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:15,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:15,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:15,975 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (92)] Ended with exit code 0 [2021-11-23 17:33:16,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:16,174 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:16,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:16,175 INFO L85 PathProgramCache]: Analyzing trace with hash 1469235337, now seen corresponding path program 1 times [2021-11-23 17:33:16,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:16,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [419467926] [2021-11-23 17:33:16,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:16,175 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:16,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:16,176 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:16,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Waiting until timeout for monitored process [2021-11-23 17:33:16,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:16,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:16,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:17,585 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 57 proven. 27 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:33:17,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:18,021 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 57 proven. 27 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:33:18,021 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:18,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [419467926] [2021-11-23 17:33:18,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [419467926] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:18,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1752867833] [2021-11-23 17:33:18,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:18,022 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:18,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:18,023 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:18,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Waiting until timeout for monitored process [2021-11-23 17:33:18,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:18,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:33:18,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:19,244 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 25 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:33:19,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:19,863 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 25 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:33:19,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1752867833] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:19,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113726117] [2021-11-23 17:33:19,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:19,864 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:19,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:19,864 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:19,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2021-11-23 17:33:19,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:19,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:33:20,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:20,799 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 25 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:33:20,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:21,196 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 25 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:33:21,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113726117] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:21,197 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:21,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:33:21,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570255614] [2021-11-23 17:33:21,198 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:21,198 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:33:21,198 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:21,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:33:21,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:33:21,199 INFO L87 Difference]: Start difference. First operand 21874 states and 25911 transitions. Second operand has 32 states, 32 states have (on average 11.0) internal successors, (352), 31 states have internal predecessors, (352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:24,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:24,916 INFO L93 Difference]: Finished difference Result 34757 states and 41305 transitions. [2021-11-23 17:33:24,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:33:24,916 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 11.0) internal successors, (352), 31 states have internal predecessors, (352), 0 states have call successors, (0), 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 121 [2021-11-23 17:33:24,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:24,952 INFO L225 Difference]: With dead ends: 34757 [2021-11-23 17:33:24,953 INFO L226 Difference]: Without dead ends: 30390 [2021-11-23 17:33:24,960 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 760 GetRequests, 700 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=364, Invalid=3176, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 17:33:24,960 INFO L933 BasicCegarLoop]: 200 mSDtfsCounter, 368 mSDsluCounter, 3238 mSDsCounter, 0 mSdLazyCounter, 238 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 3438 SdHoareTripleChecker+Invalid, 880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 632 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:24,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [368 Valid, 3438 Invalid, 880 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 238 Invalid, 0 Unknown, 632 Unchecked, 0.2s Time] [2021-11-23 17:33:24,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30390 states. [2021-11-23 17:33:26,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30390 to 24269. [2021-11-23 17:33:26,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24269 states, 24268 states have (on average 1.1850173067413878) internal successors, (28758), 24268 states have internal predecessors, (28758), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:27,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24269 states to 24269 states and 28758 transitions. [2021-11-23 17:33:27,013 INFO L78 Accepts]: Start accepts. Automaton has 24269 states and 28758 transitions. Word has length 121 [2021-11-23 17:33:27,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:27,014 INFO L470 AbstractCegarLoop]: Abstraction has 24269 states and 28758 transitions. [2021-11-23 17:33:27,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 11.0) internal successors, (352), 31 states have internal predecessors, (352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:27,014 INFO L276 IsEmpty]: Start isEmpty. Operand 24269 states and 28758 transitions. [2021-11-23 17:33:27,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 17:33:27,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:27,022 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:27,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:27,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (95)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:27,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:27,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:33:27,623 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:27,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:27,623 INFO L85 PathProgramCache]: Analyzing trace with hash -980364793, now seen corresponding path program 1 times [2021-11-23 17:33:27,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:27,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1452859034] [2021-11-23 17:33:27,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:27,624 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:27,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:27,625 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:27,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Waiting until timeout for monitored process [2021-11-23 17:33:27,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:27,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:33:27,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:28,700 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 25 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:33:28,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:29,149 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 25 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:33:29,149 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:29,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1452859034] [2021-11-23 17:33:29,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1452859034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:29,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1778624899] [2021-11-23 17:33:29,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:29,150 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:29,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:29,151 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:29,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Waiting until timeout for monitored process [2021-11-23 17:33:29,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:29,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:33:29,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:30,196 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 25 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:33:30,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:30,714 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 25 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:33:30,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1778624899] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:30,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913410363] [2021-11-23 17:33:30,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:30,715 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:30,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:30,716 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:30,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2021-11-23 17:33:30,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:30,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:33:30,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:31,709 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 25 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:33:31,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:32,167 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 32 proven. 25 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 17:33:32,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913410363] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:32,167 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:32,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:33:32,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605867128] [2021-11-23 17:33:32,168 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:32,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:33:32,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:32,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:33:32,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:33:32,169 INFO L87 Difference]: Start difference. First operand 24269 states and 28758 transitions. Second operand has 16 states, 16 states have (on average 11.125) internal successors, (178), 15 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:34,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:34,667 INFO L93 Difference]: Finished difference Result 31911 states and 37973 transitions. [2021-11-23 17:33:34,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:33:34,668 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.125) internal successors, (178), 15 states have internal predecessors, (178), 0 states have call successors, (0), 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 121 [2021-11-23 17:33:34,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:34,700 INFO L225 Difference]: With dead ends: 31911 [2021-11-23 17:33:34,700 INFO L226 Difference]: Without dead ends: 28898 [2021-11-23 17:33:34,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 731 GetRequests, 708 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=123, Invalid=477, Unknown=0, NotChecked=0, Total=600 [2021-11-23 17:33:34,707 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 172 mSDsluCounter, 969 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 1098 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 147 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:34,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [172 Valid, 1098 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 112 Invalid, 0 Unknown, 147 Unchecked, 0.1s Time] [2021-11-23 17:33:34,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28898 states. [2021-11-23 17:33:37,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28898 to 26940. [2021-11-23 17:33:37,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26940 states, 26939 states have (on average 1.1855673929989978) internal successors, (31938), 26939 states have internal predecessors, (31938), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:37,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26940 states to 26940 states and 31938 transitions. [2021-11-23 17:33:37,289 INFO L78 Accepts]: Start accepts. Automaton has 26940 states and 31938 transitions. Word has length 121 [2021-11-23 17:33:37,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:37,289 INFO L470 AbstractCegarLoop]: Abstraction has 26940 states and 31938 transitions. [2021-11-23 17:33:37,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.125) internal successors, (178), 15 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:37,289 INFO L276 IsEmpty]: Start isEmpty. Operand 26940 states and 31938 transitions. [2021-11-23 17:33:37,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 17:33:37,295 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:37,295 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:37,302 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (97)] Ended with exit code 0 [2021-11-23 17:33:37,497 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:37,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:37,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:37,896 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:37,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:37,896 INFO L85 PathProgramCache]: Analyzing trace with hash -1052751351, now seen corresponding path program 1 times [2021-11-23 17:33:37,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:37,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1733057460] [2021-11-23 17:33:37,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:37,897 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:37,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:37,898 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:37,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (100)] Waiting until timeout for monitored process [2021-11-23 17:33:37,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:37,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:33:37,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:38,625 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:33:38,625 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:33:38,625 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:38,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1733057460] [2021-11-23 17:33:38,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1733057460] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:33:38,626 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:33:38,626 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:33:38,626 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473129603] [2021-11-23 17:33:38,626 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:33:38,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:33:38,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:38,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:33:38,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:33:38,627 INFO L87 Difference]: Start difference. First operand 26940 states and 31938 transitions. Second operand has 6 states, 6 states have (on average 19.166666666666668) internal successors, (115), 5 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:41,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:41,419 INFO L93 Difference]: Finished difference Result 37841 states and 45006 transitions. [2021-11-23 17:33:41,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:33:41,420 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 19.166666666666668) internal successors, (115), 5 states have internal predecessors, (115), 0 states have call successors, (0), 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 121 [2021-11-23 17:33:41,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:41,459 INFO L225 Difference]: With dead ends: 37841 [2021-11-23 17:33:41,459 INFO L226 Difference]: Without dead ends: 34609 [2021-11-23 17:33:41,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:33:41,465 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 122 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:41,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 314 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 53 Unchecked, 0.0s Time] [2021-11-23 17:33:41,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34609 states. [2021-11-23 17:33:44,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34609 to 33729. [2021-11-23 17:33:44,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33729 states, 33728 states have (on average 1.187826138519924) internal successors, (40063), 33728 states have internal predecessors, (40063), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:44,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33729 states to 33729 states and 40063 transitions. [2021-11-23 17:33:44,342 INFO L78 Accepts]: Start accepts. Automaton has 33729 states and 40063 transitions. Word has length 121 [2021-11-23 17:33:44,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:44,342 INFO L470 AbstractCegarLoop]: Abstraction has 33729 states and 40063 transitions. [2021-11-23 17:33:44,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 19.166666666666668) internal successors, (115), 5 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:44,342 INFO L276 IsEmpty]: Start isEmpty. Operand 33729 states and 40063 transitions. [2021-11-23 17:33:44,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-23 17:33:44,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:44,348 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:44,355 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (100)] Ended with exit code 0 [2021-11-23 17:33:44,548 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:33:44,548 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:44,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:44,549 INFO L85 PathProgramCache]: Analyzing trace with hash 875521351, now seen corresponding path program 1 times [2021-11-23 17:33:44,549 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:44,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1397319692] [2021-11-23 17:33:44,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:44,549 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:44,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:44,550 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:44,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 17:33:44,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:44,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:33:44,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:45,215 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 17:33:45,216 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:33:45,216 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:45,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1397319692] [2021-11-23 17:33:45,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1397319692] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:33:45,216 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:33:45,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:33:45,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012323506] [2021-11-23 17:33:45,216 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:33:45,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:33:45,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:45,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:33:45,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:33:45,217 INFO L87 Difference]: Start difference. First operand 33729 states and 40063 transitions. Second operand has 6 states, 6 states have (on average 18.833333333333332) internal successors, (113), 5 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:47,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:47,823 INFO L93 Difference]: Finished difference Result 42035 states and 50028 transitions. [2021-11-23 17:33:47,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:33:47,824 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.833333333333332) internal successors, (113), 5 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 121 [2021-11-23 17:33:47,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:47,863 INFO L225 Difference]: With dead ends: 42035 [2021-11-23 17:33:47,863 INFO L226 Difference]: Without dead ends: 34067 [2021-11-23 17:33:47,872 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:33:47,873 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 58 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 71 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:47,873 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 400 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 71 Unchecked, 0.0s Time] [2021-11-23 17:33:47,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34067 states. [2021-11-23 17:33:51,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34067 to 34047. [2021-11-23 17:33:51,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34047 states, 34046 states have (on average 1.1869823180402985) internal successors, (40412), 34046 states have internal predecessors, (40412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:51,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34047 states to 34047 states and 40412 transitions. [2021-11-23 17:33:51,199 INFO L78 Accepts]: Start accepts. Automaton has 34047 states and 40412 transitions. Word has length 121 [2021-11-23 17:33:51,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:51,200 INFO L470 AbstractCegarLoop]: Abstraction has 34047 states and 40412 transitions. [2021-11-23 17:33:51,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.833333333333332) internal successors, (113), 5 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:51,200 INFO L276 IsEmpty]: Start isEmpty. Operand 34047 states and 40412 transitions. [2021-11-23 17:33:51,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 17:33:51,207 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:51,207 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:51,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:51,407 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:33:51,407 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:51,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:51,408 INFO L85 PathProgramCache]: Analyzing trace with hash 1694656085, now seen corresponding path program 1 times [2021-11-23 17:33:51,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:51,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2039996957] [2021-11-23 17:33:51,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:51,408 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:51,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:51,410 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:51,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Waiting until timeout for monitored process [2021-11-23 17:33:51,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:51,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:51,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:52,745 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 59 proven. 27 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:33:52,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:53,168 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 59 proven. 27 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:33:53,169 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:53,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2039996957] [2021-11-23 17:33:53,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2039996957] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:53,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [761240612] [2021-11-23 17:33:53,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:53,169 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:53,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:53,170 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:53,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Waiting until timeout for monitored process [2021-11-23 17:33:53,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:53,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:53,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:54,703 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 59 proven. 27 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:33:54,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:55,043 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 59 proven. 27 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:33:55,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [761240612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:55,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494900928] [2021-11-23 17:33:55,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:55,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:55,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:55,045 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:55,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-23 17:33:55,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:55,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:33:55,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:55,741 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 59 proven. 23 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:33:55,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:56,350 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 59 proven. 23 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:33:56,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494900928] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:56,350 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:56,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 5, 5] total 24 [2021-11-23 17:33:56,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033400713] [2021-11-23 17:33:56,351 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:56,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 17:33:56,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:56,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 17:33:56,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=498, Unknown=0, NotChecked=0, Total=600 [2021-11-23 17:33:56,352 INFO L87 Difference]: Start difference. First operand 34047 states and 40412 transitions. Second operand has 25 states, 25 states have (on average 13.24) internal successors, (331), 24 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:00,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:00,264 INFO L93 Difference]: Finished difference Result 61153 states and 72667 transitions. [2021-11-23 17:34:00,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 17:34:00,264 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 13.24) internal successors, (331), 24 states have internal predecessors, (331), 0 states have call successors, (0), 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 123 [2021-11-23 17:34:00,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:00,314 INFO L225 Difference]: With dead ends: 61153 [2021-11-23 17:34:00,314 INFO L226 Difference]: Without dead ends: 41946 [2021-11-23 17:34:00,331 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 759 GetRequests, 720 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=270, Invalid=1370, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 17:34:00,331 INFO L933 BasicCegarLoop]: 165 mSDtfsCounter, 573 mSDsluCounter, 2057 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 573 SdHoareTripleChecker+Valid, 2222 SdHoareTripleChecker+Invalid, 703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 479 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:00,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [573 Valid, 2222 Invalid, 703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 203 Invalid, 0 Unknown, 479 Unchecked, 0.2s Time] [2021-11-23 17:34:00,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41946 states. [2021-11-23 17:34:03,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41946 to 37286. [2021-11-23 17:34:03,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37286 states, 37285 states have (on average 1.1714362344106208) internal successors, (43677), 37285 states have internal predecessors, (43677), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:03,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37286 states to 37286 states and 43677 transitions. [2021-11-23 17:34:03,715 INFO L78 Accepts]: Start accepts. Automaton has 37286 states and 43677 transitions. Word has length 123 [2021-11-23 17:34:03,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:03,716 INFO L470 AbstractCegarLoop]: Abstraction has 37286 states and 43677 transitions. [2021-11-23 17:34:03,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 13.24) internal successors, (331), 24 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:03,716 INFO L276 IsEmpty]: Start isEmpty. Operand 37286 states and 43677 transitions. [2021-11-23 17:34:03,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 17:34:03,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:03,724 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:03,746 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2021-11-23 17:34:03,925 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Ended with exit code 0 [2021-11-23 17:34:04,132 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Ended with exit code 0 [2021-11-23 17:34:04,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:04,326 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:04,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:04,326 INFO L85 PathProgramCache]: Analyzing trace with hash 2023438378, now seen corresponding path program 1 times [2021-11-23 17:34:04,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:04,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1153450380] [2021-11-23 17:34:04,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:04,327 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:04,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:04,327 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:04,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:34:04,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:04,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:34:04,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:04,559 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 17:34:04,559 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:04,559 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:04,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1153450380] [2021-11-23 17:34:04,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1153450380] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:04,560 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:34:04,560 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:34:04,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918775833] [2021-11-23 17:34:04,560 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:04,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:34:04,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:04,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:34:04,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:34:04,561 INFO L87 Difference]: Start difference. First operand 37286 states and 43677 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:06,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:06,092 INFO L93 Difference]: Finished difference Result 51821 states and 60828 transitions. [2021-11-23 17:34:06,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:34:06,092 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 0 states have call successors, (0), 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 123 [2021-11-23 17:34:06,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:06,109 INFO L225 Difference]: With dead ends: 51821 [2021-11-23 17:34:06,110 INFO L226 Difference]: Without dead ends: 15392 [2021-11-23 17:34:06,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:34:06,123 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 26 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 171 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 17:34:06,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 171 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:34:06,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15392 states. [2021-11-23 17:34:07,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15392 to 14162. [2021-11-23 17:34:07,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14162 states, 14161 states have (on average 1.1523903679118706) internal successors, (16319), 14161 states have internal predecessors, (16319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:07,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14162 states to 14162 states and 16319 transitions. [2021-11-23 17:34:07,545 INFO L78 Accepts]: Start accepts. Automaton has 14162 states and 16319 transitions. Word has length 123 [2021-11-23 17:34:07,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:07,546 INFO L470 AbstractCegarLoop]: Abstraction has 14162 states and 16319 transitions. [2021-11-23 17:34:07,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:07,546 INFO L276 IsEmpty]: Start isEmpty. Operand 14162 states and 16319 transitions. [2021-11-23 17:34:07,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 17:34:07,549 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:07,549 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:07,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:07,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:07,749 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:07,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:07,750 INFO L85 PathProgramCache]: Analyzing trace with hash -1924129321, now seen corresponding path program 1 times [2021-11-23 17:34:07,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:07,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2078813731] [2021-11-23 17:34:07,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:07,750 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:07,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:07,770 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:07,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Waiting until timeout for monitored process [2021-11-23 17:34:07,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:07,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:34:07,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:08,962 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 50 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:34:08,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:09,318 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 50 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:34:09,318 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:09,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2078813731] [2021-11-23 17:34:09,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2078813731] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:09,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1276636280] [2021-11-23 17:34:09,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:09,319 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:09,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:09,320 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:09,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (107)] Waiting until timeout for monitored process [2021-11-23 17:34:09,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:09,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:34:09,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:10,649 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 50 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:34:10,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:10,979 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 50 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:34:10,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1276636280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:10,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714051884] [2021-11-23 17:34:10,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:10,980 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:10,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:10,981 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:10,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2021-11-23 17:34:11,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:11,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:34:11,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:12,107 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 50 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:34:12,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:12,369 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 50 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 17:34:12,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [714051884] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:12,369 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:12,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:34:12,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202313573] [2021-11-23 17:34:12,370 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:12,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:34:12,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:12,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:34:12,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:34:12,371 INFO L87 Difference]: Start difference. First operand 14162 states and 16319 transitions. Second operand has 16 states, 16 states have (on average 12.875) internal successors, (206), 15 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:13,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:13,609 INFO L93 Difference]: Finished difference Result 17747 states and 20461 transitions. [2021-11-23 17:34:13,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:34:13,609 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 12.875) internal successors, (206), 15 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2021-11-23 17:34:13,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:13,624 INFO L225 Difference]: With dead ends: 17747 [2021-11-23 17:34:13,624 INFO L226 Difference]: Without dead ends: 14508 [2021-11-23 17:34:13,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 742 GetRequests, 721 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2021-11-23 17:34:13,629 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 183 mSDsluCounter, 1163 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 1298 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 213 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:13,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 1298 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 67 Invalid, 0 Unknown, 213 Unchecked, 0.0s Time] [2021-11-23 17:34:13,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14508 states. [2021-11-23 17:34:14,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14508 to 14318. [2021-11-23 17:34:14,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14318 states, 14317 states have (on average 1.1513585248306208) internal successors, (16484), 14317 states have internal predecessors, (16484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:14,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14318 states to 14318 states and 16484 transitions. [2021-11-23 17:34:14,881 INFO L78 Accepts]: Start accepts. Automaton has 14318 states and 16484 transitions. Word has length 123 [2021-11-23 17:34:14,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:14,881 INFO L470 AbstractCegarLoop]: Abstraction has 14318 states and 16484 transitions. [2021-11-23 17:34:14,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 12.875) internal successors, (206), 15 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:14,882 INFO L276 IsEmpty]: Start isEmpty. Operand 14318 states and 16484 transitions. [2021-11-23 17:34:14,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 17:34:14,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:14,884 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:14,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (107)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:15,104 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Ended with exit code 0 [2021-11-23 17:34:15,291 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Ended with exit code 0 [2021-11-23 17:34:15,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:15,485 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:15,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:15,485 INFO L85 PathProgramCache]: Analyzing trace with hash -2090002009, now seen corresponding path program 2 times [2021-11-23 17:34:15,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:15,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2085307573] [2021-11-23 17:34:15,486 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:34:15,486 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:15,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:15,487 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:15,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (109)] Waiting until timeout for monitored process [2021-11-23 17:34:15,552 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:34:15,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:34:15,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:34:15,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:17,096 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:17,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:17,647 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:17,647 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:17,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2085307573] [2021-11-23 17:34:17,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2085307573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:17,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1692184065] [2021-11-23 17:34:17,647 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:34:17,647 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:17,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:17,648 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:17,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (110)] Waiting until timeout for monitored process [2021-11-23 17:34:17,760 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:34:17,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:34:17,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:34:17,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:19,413 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:19,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:19,865 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:19,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1692184065] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:19,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417789214] [2021-11-23 17:34:19,866 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:34:19,866 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:19,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:19,866 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:19,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2021-11-23 17:34:19,927 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:34:19,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:34:19,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:34:19,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:21,537 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 67 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:34:21,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:22,095 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 24 proven. 67 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:34:22,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417789214] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:22,096 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:22,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:34:22,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321878347] [2021-11-23 17:34:22,096 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:22,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:34:22,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:22,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:34:22,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:34:22,097 INFO L87 Difference]: Start difference. First operand 14318 states and 16484 transitions. Second operand has 34 states, 34 states have (on average 11.441176470588236) internal successors, (389), 33 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:23,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:23,906 INFO L93 Difference]: Finished difference Result 19284 states and 22254 transitions. [2021-11-23 17:34:23,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 17:34:23,907 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 11.441176470588236) internal successors, (389), 33 states have internal predecessors, (389), 0 states have call successors, (0), 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 123 [2021-11-23 17:34:23,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:23,920 INFO L225 Difference]: With dead ends: 19284 [2021-11-23 17:34:23,920 INFO L226 Difference]: Without dead ends: 16045 [2021-11-23 17:34:23,923 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 749 GetRequests, 705 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=276, Invalid=1794, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 17:34:23,923 INFO L933 BasicCegarLoop]: 152 mSDtfsCounter, 304 mSDsluCounter, 3046 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 3198 SdHoareTripleChecker+Invalid, 804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 554 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:23,923 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [304 Valid, 3198 Invalid, 804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 241 Invalid, 0 Unknown, 554 Unchecked, 0.1s Time] [2021-11-23 17:34:23,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16045 states. [2021-11-23 17:34:25,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16045 to 14341. [2021-11-23 17:34:25,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14341 states, 14340 states have (on average 1.1513249651324966) internal successors, (16510), 14340 states have internal predecessors, (16510), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:25,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14341 states to 14341 states and 16510 transitions. [2021-11-23 17:34:25,047 INFO L78 Accepts]: Start accepts. Automaton has 14341 states and 16510 transitions. Word has length 123 [2021-11-23 17:34:25,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:25,047 INFO L470 AbstractCegarLoop]: Abstraction has 14341 states and 16510 transitions. [2021-11-23 17:34:25,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 11.441176470588236) internal successors, (389), 33 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:25,047 INFO L276 IsEmpty]: Start isEmpty. Operand 14341 states and 16510 transitions. [2021-11-23 17:34:25,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-23 17:34:25,050 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:25,050 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:25,069 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Ended with exit code 0 [2021-11-23 17:34:25,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (110)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:25,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (109)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:25,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:25,651 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:25,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:25,651 INFO L85 PathProgramCache]: Analyzing trace with hash -2105520727, now seen corresponding path program 1 times [2021-11-23 17:34:25,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:25,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1366100503] [2021-11-23 17:34:25,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:25,652 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:25,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:25,652 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:25,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (112)] Waiting until timeout for monitored process [2021-11-23 17:34:25,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:25,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:25,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:26,657 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:26,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:27,132 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:27,132 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:27,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1366100503] [2021-11-23 17:34:27,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1366100503] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:27,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1773768690] [2021-11-23 17:34:27,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:27,133 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:27,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:27,134 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:27,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (113)] Waiting until timeout for monitored process [2021-11-23 17:34:27,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:27,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:27,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:28,242 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:28,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:28,651 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 65 proven. 19 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:28,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1773768690] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:28,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790575008] [2021-11-23 17:34:28,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:28,652 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:28,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:28,652 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:28,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2021-11-23 17:34:28,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:28,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:34:28,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:29,250 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 65 proven. 17 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:34:29,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:29,778 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 65 proven. 17 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:34:29,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790575008] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:29,779 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:29,779 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 5, 5] total 24 [2021-11-23 17:34:29,779 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012749677] [2021-11-23 17:34:29,779 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:29,780 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 17:34:29,780 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:29,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 17:34:29,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=498, Unknown=0, NotChecked=0, Total=600 [2021-11-23 17:34:29,780 INFO L87 Difference]: Start difference. First operand 14341 states and 16510 transitions. Second operand has 25 states, 25 states have (on average 12.64) internal successors, (316), 24 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:31,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:31,480 INFO L93 Difference]: Finished difference Result 18265 states and 21077 transitions. [2021-11-23 17:34:31,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:34:31,481 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 12.64) internal successors, (316), 24 states have internal predecessors, (316), 0 states have call successors, (0), 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 123 [2021-11-23 17:34:31,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:31,497 INFO L225 Difference]: With dead ends: 18265 [2021-11-23 17:34:31,497 INFO L226 Difference]: Without dead ends: 15990 [2021-11-23 17:34:31,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 748 GetRequests, 713 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=229, Invalid=1103, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 17:34:31,501 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 192 mSDsluCounter, 1374 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 1505 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 321 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:31,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 1505 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 218 Invalid, 0 Unknown, 321 Unchecked, 0.1s Time] [2021-11-23 17:34:31,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15990 states. [2021-11-23 17:34:32,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15990 to 14303. [2021-11-23 17:34:32,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14303 states, 14302 states have (on average 1.151447350020976) internal successors, (16468), 14302 states have internal predecessors, (16468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:32,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14303 states to 14303 states and 16468 transitions. [2021-11-23 17:34:32,709 INFO L78 Accepts]: Start accepts. Automaton has 14303 states and 16468 transitions. Word has length 123 [2021-11-23 17:34:32,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:32,709 INFO L470 AbstractCegarLoop]: Abstraction has 14303 states and 16468 transitions. [2021-11-23 17:34:32,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 12.64) internal successors, (316), 24 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:32,709 INFO L276 IsEmpty]: Start isEmpty. Operand 14303 states and 16468 transitions. [2021-11-23 17:34:32,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 17:34:32,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:32,712 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:32,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (112)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:32,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (113)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:33,133 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Ended with exit code 0 [2021-11-23 17:34:33,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:33,313 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:33,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:33,313 INFO L85 PathProgramCache]: Analyzing trace with hash 699112268, now seen corresponding path program 1 times [2021-11-23 17:34:33,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:33,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [838788475] [2021-11-23 17:34:33,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:33,314 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:33,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:33,315 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:33,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (115)] Waiting until timeout for monitored process [2021-11-23 17:34:33,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:33,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:34:33,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:34,335 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 31 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:34,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:34,818 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 17:34:34,819 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:34,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [838788475] [2021-11-23 17:34:34,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [838788475] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:34,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1890673494] [2021-11-23 17:34:34,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:34,819 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:34,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:34,821 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:34,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (116)] Waiting until timeout for monitored process [2021-11-23 17:34:34,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:34,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:34:34,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:35,798 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 31 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:35,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:36,159 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 17:34:36,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1890673494] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:36,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386604302] [2021-11-23 17:34:36,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:36,160 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:36,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:36,161 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:36,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2021-11-23 17:34:36,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:36,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:34:36,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:37,572 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 31 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:37,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:37,947 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 17:34:37,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386604302] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:37,947 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:37,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 14, 11, 15, 11] total 30 [2021-11-23 17:34:37,948 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193903422] [2021-11-23 17:34:37,948 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:37,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 17:34:37,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:37,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 17:34:37,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=731, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:34:37,949 INFO L87 Difference]: Start difference. First operand 14303 states and 16468 transitions. Second operand has 30 states, 30 states have (on average 9.533333333333333) internal successors, (286), 30 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:40,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:40,178 INFO L93 Difference]: Finished difference Result 29245 states and 33847 transitions. [2021-11-23 17:34:40,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:34:40,178 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 9.533333333333333) internal successors, (286), 30 states have internal predecessors, (286), 0 states have call successors, (0), 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 124 [2021-11-23 17:34:40,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:40,200 INFO L225 Difference]: With dead ends: 29245 [2021-11-23 17:34:40,200 INFO L226 Difference]: Without dead ends: 22339 [2021-11-23 17:34:40,207 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 754 GetRequests, 713 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=268, Invalid=1372, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 17:34:40,208 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 465 mSDsluCounter, 3355 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 465 SdHoareTripleChecker+Valid, 3570 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:40,208 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [465 Valid, 3570 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 87 Invalid, 0 Unknown, 160 Unchecked, 0.1s Time] [2021-11-23 17:34:40,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22339 states. [2021-11-23 17:34:42,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22339 to 21932. [2021-11-23 17:34:42,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21932 states, 21931 states have (on average 1.1542565318498927) internal successors, (25314), 21931 states have internal predecessors, (25314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:42,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21932 states to 21932 states and 25314 transitions. [2021-11-23 17:34:42,144 INFO L78 Accepts]: Start accepts. Automaton has 21932 states and 25314 transitions. Word has length 124 [2021-11-23 17:34:42,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:42,144 INFO L470 AbstractCegarLoop]: Abstraction has 21932 states and 25314 transitions. [2021-11-23 17:34:42,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 9.533333333333333) internal successors, (286), 30 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:42,145 INFO L276 IsEmpty]: Start isEmpty. Operand 21932 states and 25314 transitions. [2021-11-23 17:34:42,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 17:34:42,147 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:42,148 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:42,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (115)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:42,349 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (116)] Ended with exit code 0 [2021-11-23 17:34:42,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:42,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:42,749 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:42,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:42,749 INFO L85 PathProgramCache]: Analyzing trace with hash 1238755885, now seen corresponding path program 1 times [2021-11-23 17:34:42,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:42,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [934612926] [2021-11-23 17:34:42,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:42,749 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:42,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:42,750 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:42,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Waiting until timeout for monitored process [2021-11-23 17:34:42,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:42,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:34:42,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:44,463 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 24 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:44,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:45,074 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 24 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:45,074 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:45,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [934612926] [2021-11-23 17:34:45,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [934612926] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:45,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [412136924] [2021-11-23 17:34:45,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:45,075 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:45,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:45,075 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:45,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (119)] Waiting until timeout for monitored process [2021-11-23 17:34:45,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:45,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:34:45,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:47,178 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 24 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:47,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:47,738 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 24 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:47,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [412136924] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:47,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067174204] [2021-11-23 17:34:47,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:47,738 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:47,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:47,739 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:47,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2021-11-23 17:34:47,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:47,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:34:47,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:49,528 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 24 proven. 68 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:34:49,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:50,158 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 24 proven. 68 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:34:50,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067174204] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:50,158 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:50,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:34:50,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138821736] [2021-11-23 17:34:50,159 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:50,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:34:50,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:50,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:34:50,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:34:50,160 INFO L87 Difference]: Start difference. First operand 21932 states and 25314 transitions. Second operand has 34 states, 34 states have (on average 11.735294117647058) internal successors, (399), 33 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:52,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:52,875 INFO L93 Difference]: Finished difference Result 28530 states and 33051 transitions. [2021-11-23 17:34:52,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 17:34:52,875 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 11.735294117647058) internal successors, (399), 33 states have internal predecessors, (399), 0 states have call successors, (0), 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 124 [2021-11-23 17:34:52,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:52,907 INFO L225 Difference]: With dead ends: 28530 [2021-11-23 17:34:52,907 INFO L226 Difference]: Without dead ends: 24549 [2021-11-23 17:34:52,913 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 757 GetRequests, 711 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=293, Invalid=1963, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:34:52,914 INFO L933 BasicCegarLoop]: 151 mSDtfsCounter, 293 mSDsluCounter, 2583 mSDsCounter, 0 mSdLazyCounter, 434 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 2734 SdHoareTripleChecker+Invalid, 1186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 741 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:52,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [293 Valid, 2734 Invalid, 1186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 434 Invalid, 0 Unknown, 741 Unchecked, 0.2s Time] [2021-11-23 17:34:52,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24549 states. [2021-11-23 17:34:54,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24549 to 21932. [2021-11-23 17:34:54,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21932 states, 21931 states have (on average 1.1540741416260087) internal successors, (25310), 21931 states have internal predecessors, (25310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:55,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21932 states to 21932 states and 25310 transitions. [2021-11-23 17:34:55,025 INFO L78 Accepts]: Start accepts. Automaton has 21932 states and 25310 transitions. Word has length 124 [2021-11-23 17:34:55,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:55,026 INFO L470 AbstractCegarLoop]: Abstraction has 21932 states and 25310 transitions. [2021-11-23 17:34:55,026 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 11.735294117647058) internal successors, (399), 33 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:55,026 INFO L276 IsEmpty]: Start isEmpty. Operand 21932 states and 25310 transitions. [2021-11-23 17:34:55,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 17:34:55,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:55,029 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:55,061 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Ended with exit code 0 [2021-11-23 17:34:55,261 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Ended with exit code 0 [2021-11-23 17:34:55,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (119)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:55,654 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:55,655 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:55,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:55,655 INFO L85 PathProgramCache]: Analyzing trace with hash 2132242223, now seen corresponding path program 1 times [2021-11-23 17:34:55,655 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:55,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [764869036] [2021-11-23 17:34:55,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:55,656 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:55,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:55,657 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:55,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (121)] Waiting until timeout for monitored process [2021-11-23 17:34:55,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:55,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:55,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:56,946 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 66 proven. 19 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:56,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:57,511 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 66 proven. 19 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:57,511 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:57,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [764869036] [2021-11-23 17:34:57,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [764869036] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:57,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1061202302] [2021-11-23 17:34:57,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:57,512 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:57,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:57,512 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:57,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (122)] Waiting until timeout for monitored process [2021-11-23 17:34:57,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:57,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:34:57,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:00,995 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 17:35:00,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:01,731 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 17:35:01,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1061202302] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:01,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1100827519] [2021-11-23 17:35:01,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:01,732 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:01,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:01,733 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:01,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2021-11-23 17:35:01,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:01,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:35:01,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:03,433 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 74 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:35:03,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:04,103 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 16 proven. 74 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:35:04,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1100827519] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:04,104 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:04,104 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:35:04,104 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069901431] [2021-11-23 17:35:04,104 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:04,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:35:04,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:04,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:35:04,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:35:04,107 INFO L87 Difference]: Start difference. First operand 21932 states and 25310 transitions. Second operand has 48 states, 48 states have (on average 12.3125) internal successors, (591), 47 states have internal predecessors, (591), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:13,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:13,728 INFO L93 Difference]: Finished difference Result 49842 states and 57672 transitions. [2021-11-23 17:35:13,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-11-23 17:35:13,728 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.3125) internal successors, (591), 47 states have internal predecessors, (591), 0 states have call successors, (0), 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 124 [2021-11-23 17:35:13,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:13,767 INFO L225 Difference]: With dead ends: 49842 [2021-11-23 17:35:13,767 INFO L226 Difference]: Without dead ends: 34201 [2021-11-23 17:35:13,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 904 GetRequests, 742 SyntacticMatches, 3 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8491 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1436, Invalid=24324, Unknown=0, NotChecked=0, Total=25760 [2021-11-23 17:35:13,781 INFO L933 BasicCegarLoop]: 291 mSDtfsCounter, 729 mSDsluCounter, 6538 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 729 SdHoareTripleChecker+Valid, 6829 SdHoareTripleChecker+Invalid, 3079 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1781 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:13,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [729 Valid, 6829 Invalid, 3079 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1274 Invalid, 0 Unknown, 1781 Unchecked, 0.8s Time] [2021-11-23 17:35:13,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34201 states. [2021-11-23 17:35:15,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34201 to 25883. [2021-11-23 17:35:16,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25883 states, 25882 states have (on average 1.145351982072483) internal successors, (29644), 25882 states have internal predecessors, (29644), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:16,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25883 states to 25883 states and 29644 transitions. [2021-11-23 17:35:16,282 INFO L78 Accepts]: Start accepts. Automaton has 25883 states and 29644 transitions. Word has length 124 [2021-11-23 17:35:16,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:16,283 INFO L470 AbstractCegarLoop]: Abstraction has 25883 states and 29644 transitions. [2021-11-23 17:35:16,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.3125) internal successors, (591), 47 states have internal predecessors, (591), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:16,283 INFO L276 IsEmpty]: Start isEmpty. Operand 25883 states and 29644 transitions. [2021-11-23 17:35:16,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 17:35:16,287 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:16,287 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:16,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (122)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:16,510 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Ended with exit code 0 [2021-11-23 17:35:16,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (121)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:16,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:16,888 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:16,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:16,888 INFO L85 PathProgramCache]: Analyzing trace with hash -1910804500, now seen corresponding path program 1 times [2021-11-23 17:35:16,889 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:16,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1110608541] [2021-11-23 17:35:16,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:16,889 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:16,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:16,890 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:16,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (124)] Waiting until timeout for monitored process [2021-11-23 17:35:16,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:16,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:16,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:17,788 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 17:35:17,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:18,209 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 17:35:18,209 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:18,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1110608541] [2021-11-23 17:35:18,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1110608541] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:18,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1568404463] [2021-11-23 17:35:18,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:18,209 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:18,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:18,210 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:18,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (125)] Waiting until timeout for monitored process [2021-11-23 17:35:18,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:18,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:35:18,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:19,200 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 17:35:19,201 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:19,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1568404463] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:19,201 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:35:19,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [14, 11] total 30 [2021-11-23 17:35:19,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890387432] [2021-11-23 17:35:19,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:19,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 17:35:19,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:19,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 17:35:19,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:35:19,202 INFO L87 Difference]: Start difference. First operand 25883 states and 29644 transitions. Second operand has 11 states, 11 states have (on average 9.272727272727273) internal successors, (102), 11 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:21,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:21,383 INFO L93 Difference]: Finished difference Result 27695 states and 31745 transitions. [2021-11-23 17:35:21,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:35:21,383 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 9.272727272727273) internal successors, (102), 11 states have internal predecessors, (102), 0 states have call successors, (0), 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 124 [2021-11-23 17:35:21,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:21,414 INFO L225 Difference]: With dead ends: 27695 [2021-11-23 17:35:21,414 INFO L226 Difference]: Without dead ends: 25834 [2021-11-23 17:35:21,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 341 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2021-11-23 17:35:21,422 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 55 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:21,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 622 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 64 Unchecked, 0.0s Time] [2021-11-23 17:35:21,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25834 states. [2021-11-23 17:35:23,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25834 to 25834. [2021-11-23 17:35:23,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25834 states, 25833 states have (on average 1.1455502651647118) internal successors, (29593), 25833 states have internal predecessors, (29593), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:23,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25834 states to 25834 states and 29593 transitions. [2021-11-23 17:35:23,835 INFO L78 Accepts]: Start accepts. Automaton has 25834 states and 29593 transitions. Word has length 124 [2021-11-23 17:35:23,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:23,835 INFO L470 AbstractCegarLoop]: Abstraction has 25834 states and 29593 transitions. [2021-11-23 17:35:23,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 9.272727272727273) internal successors, (102), 11 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:23,836 INFO L276 IsEmpty]: Start isEmpty. Operand 25834 states and 29593 transitions. [2021-11-23 17:35:23,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 17:35:23,839 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:23,839 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:23,847 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (124)] Ended with exit code 0 [2021-11-23 17:35:24,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (125)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:24,242 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:24,242 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:24,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:24,242 INFO L85 PathProgramCache]: Analyzing trace with hash 1537076764, now seen corresponding path program 2 times [2021-11-23 17:35:24,243 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:24,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1188331386] [2021-11-23 17:35:24,243 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:35:24,243 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:24,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:24,244 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:24,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (126)] Waiting until timeout for monitored process [2021-11-23 17:35:24,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:35:24,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:24,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:24,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:25,173 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 17:35:25,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:25,559 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 17:35:25,559 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:25,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1188331386] [2021-11-23 17:35:25,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1188331386] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:25,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [225480481] [2021-11-23 17:35:25,559 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:35:25,560 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:25,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:25,560 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:25,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (127)] Waiting until timeout for monitored process [2021-11-23 17:35:25,683 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:35:25,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:25,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:35:25,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:26,772 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 17:35:26,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:27,036 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 17:35:27,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [225480481] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:27,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239830263] [2021-11-23 17:35:27,036 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:35:27,037 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:27,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:27,038 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:27,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2021-11-23 17:35:27,119 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:35:27,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:35:27,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:35:27,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:27,776 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 56 proven. 34 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:35:27,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:28,079 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 17:35:28,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239830263] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:28,079 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:28,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 15, 11, 12, 11] total 33 [2021-11-23 17:35:28,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701016606] [2021-11-23 17:35:28,080 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:28,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 17:35:28,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:28,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 17:35:28,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:35:28,082 INFO L87 Difference]: Start difference. First operand 25834 states and 29593 transitions. Second operand has 33 states, 33 states have (on average 9.242424242424242) internal successors, (305), 33 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:32,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:32,982 INFO L93 Difference]: Finished difference Result 59299 states and 68404 transitions. [2021-11-23 17:35:32,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:35:32,983 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 9.242424242424242) internal successors, (305), 33 states have internal predecessors, (305), 0 states have call successors, (0), 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 124 [2021-11-23 17:35:32,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:33,038 INFO L225 Difference]: With dead ends: 59299 [2021-11-23 17:35:33,038 INFO L226 Difference]: Without dead ends: 47861 [2021-11-23 17:35:33,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 753 GetRequests, 710 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=275, Invalid=1531, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 17:35:33,047 INFO L933 BasicCegarLoop]: 225 mSDtfsCounter, 602 mSDsluCounter, 3620 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 602 SdHoareTripleChecker+Valid, 3845 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 139 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:33,047 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [602 Valid, 3845 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 194 Invalid, 0 Unknown, 139 Unchecked, 0.2s Time] [2021-11-23 17:35:33,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47861 states. [2021-11-23 17:35:36,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47861 to 39404. [2021-11-23 17:35:36,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39404 states, 39403 states have (on average 1.1460548689186103) internal successors, (45158), 39403 states have internal predecessors, (45158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:36,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39404 states to 39404 states and 45158 transitions. [2021-11-23 17:35:36,774 INFO L78 Accepts]: Start accepts. Automaton has 39404 states and 45158 transitions. Word has length 124 [2021-11-23 17:35:36,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:36,774 INFO L470 AbstractCegarLoop]: Abstraction has 39404 states and 45158 transitions. [2021-11-23 17:35:36,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 9.242424242424242) internal successors, (305), 33 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:36,775 INFO L276 IsEmpty]: Start isEmpty. Operand 39404 states and 45158 transitions. [2021-11-23 17:35:36,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 17:35:36,782 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:36,782 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:36,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:36,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (127)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:37,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (126)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:37,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:37,399 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:37,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:37,399 INFO L85 PathProgramCache]: Analyzing trace with hash 2143049959, now seen corresponding path program 1 times [2021-11-23 17:35:37,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:37,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2041112281] [2021-11-23 17:35:37,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:37,400 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:37,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:37,404 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:37,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Waiting until timeout for monitored process [2021-11-23 17:35:37,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:37,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:35:37,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:37,890 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 33 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:37,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:38,168 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 33 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:38,168 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:38,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2041112281] [2021-11-23 17:35:38,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2041112281] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:38,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [181356053] [2021-11-23 17:35:38,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:38,169 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:38,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:38,170 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:38,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Waiting until timeout for monitored process [2021-11-23 17:35:38,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:38,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:35:38,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:40,912 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 31 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:40,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:41,553 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 44 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:41,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [181356053] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:41,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [640293937] [2021-11-23 17:35:41,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:41,553 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:41,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:41,554 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:41,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2021-11-23 17:35:41,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:41,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:35:41,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:44,665 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 25 proven. 68 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:35:44,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:45,574 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 35 proven. 58 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:35:45,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [640293937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:45,574 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:45,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 16, 12, 13, 11] total 49 [2021-11-23 17:35:45,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851696014] [2021-11-23 17:35:45,574 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:45,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 17:35:45,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:45,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 17:35:45,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=2076, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 17:35:45,576 INFO L87 Difference]: Start difference. First operand 39404 states and 45158 transitions. Second operand has 49 states, 49 states have (on average 9.693877551020408) internal successors, (475), 49 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:53,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:53,106 INFO L93 Difference]: Finished difference Result 74753 states and 87287 transitions. [2021-11-23 17:35:53,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-23 17:35:53,107 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 9.693877551020408) internal successors, (475), 49 states have internal predecessors, (475), 0 states have call successors, (0), 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 125 [2021-11-23 17:35:53,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:53,210 INFO L225 Difference]: With dead ends: 74753 [2021-11-23 17:35:53,210 INFO L226 Difference]: Without dead ends: 63509 [2021-11-23 17:35:53,225 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 717 SyntacticMatches, 18 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2743 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=876, Invalid=5130, Unknown=0, NotChecked=0, Total=6006 [2021-11-23 17:35:53,225 INFO L933 BasicCegarLoop]: 295 mSDtfsCounter, 1171 mSDsluCounter, 7197 mSDsCounter, 0 mSdLazyCounter, 564 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1171 SdHoareTripleChecker+Valid, 7492 SdHoareTripleChecker+Invalid, 1200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 614 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:53,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1171 Valid, 7492 Invalid, 1200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 564 Invalid, 0 Unknown, 614 Unchecked, 0.4s Time] [2021-11-23 17:35:53,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63509 states. [2021-11-23 17:35:58,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63509 to 51089. [2021-11-23 17:35:58,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51089 states, 51088 states have (on average 1.1560053241465706) internal successors, (59058), 51088 states have internal predecessors, (59058), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:58,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51089 states to 51089 states and 59058 transitions. [2021-11-23 17:35:58,632 INFO L78 Accepts]: Start accepts. Automaton has 51089 states and 59058 transitions. Word has length 125 [2021-11-23 17:35:58,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:58,633 INFO L470 AbstractCegarLoop]: Abstraction has 51089 states and 59058 transitions. [2021-11-23 17:35:58,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 9.693877551020408) internal successors, (475), 49 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:58,633 INFO L276 IsEmpty]: Start isEmpty. Operand 51089 states and 59058 transitions. [2021-11-23 17:35:58,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 17:35:58,637 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:58,638 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:58,664 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Ended with exit code 0 [2021-11-23 17:35:58,839 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Ended with exit code 0 [2021-11-23 17:35:59,047 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:59,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:59,240 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:59,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:59,240 INFO L85 PathProgramCache]: Analyzing trace with hash 1983039686, now seen corresponding path program 1 times [2021-11-23 17:35:59,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:59,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [166856683] [2021-11-23 17:35:59,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:59,241 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:59,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:59,242 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:59,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Waiting until timeout for monitored process [2021-11-23 17:35:59,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:59,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:35:59,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:59,936 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 17:35:59,936 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:59,936 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:59,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [166856683] [2021-11-23 17:35:59,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [166856683] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:59,936 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:59,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:35:59,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026673707] [2021-11-23 17:35:59,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:59,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:35:59,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:59,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:35:59,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:35:59,937 INFO L87 Difference]: Start difference. First operand 51089 states and 59058 transitions. Second operand has 6 states, 6 states have (on average 19.5) internal successors, (117), 5 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:05,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:05,045 INFO L93 Difference]: Finished difference Result 68761 states and 79813 transitions. [2021-11-23 17:36:05,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:36:05,045 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 19.5) internal successors, (117), 5 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 125 [2021-11-23 17:36:05,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:05,123 INFO L225 Difference]: With dead ends: 68761 [2021-11-23 17:36:05,123 INFO L226 Difference]: Without dead ends: 54259 [2021-11-23 17:36:05,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:36:05,139 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 67 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:05,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 396 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 77 Unchecked, 0.0s Time] [2021-11-23 17:36:05,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54259 states. [2021-11-23 17:36:10,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54259 to 54257. [2021-11-23 17:36:10,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54257 states, 54256 states have (on average 1.1545819817163079) internal successors, (62643), 54256 states have internal predecessors, (62643), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:10,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54257 states to 54257 states and 62643 transitions. [2021-11-23 17:36:10,858 INFO L78 Accepts]: Start accepts. Automaton has 54257 states and 62643 transitions. Word has length 125 [2021-11-23 17:36:10,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:10,858 INFO L470 AbstractCegarLoop]: Abstraction has 54257 states and 62643 transitions. [2021-11-23 17:36:10,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 19.5) internal successors, (117), 5 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:10,858 INFO L276 IsEmpty]: Start isEmpty. Operand 54257 states and 62643 transitions. [2021-11-23 17:36:10,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 17:36:10,862 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:10,862 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:10,871 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Ended with exit code 0 [2021-11-23 17:36:11,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:36:11,063 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:11,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:11,063 INFO L85 PathProgramCache]: Analyzing trace with hash 1780157226, now seen corresponding path program 1 times [2021-11-23 17:36:11,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:11,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2096614512] [2021-11-23 17:36:11,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:11,064 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:11,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:11,065 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:11,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (133)] Waiting until timeout for monitored process [2021-11-23 17:36:11,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:11,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:36:11,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:12,415 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 66 proven. 19 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:36:12,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:12,972 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 66 proven. 19 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:36:12,972 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:12,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2096614512] [2021-11-23 17:36:12,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2096614512] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:12,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [810481501] [2021-11-23 17:36:12,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:12,973 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:12,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:12,974 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:12,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_459b84c7-9912-4d7a-9097-5ffb83e2b0e1/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (134)] Waiting until timeout for monitored process [2021-11-23 17:36:13,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:13,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:36:13,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:13,390 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:36:13,390 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:36:13,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [810481501] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:36:13,390 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:36:13,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 10] total 21 [2021-11-23 17:36:13,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213081503] [2021-11-23 17:36:13,390 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:36:13,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:36:13,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:13,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:36:13,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:36:13,391 INFO L87 Difference]: Start difference. First operand 54257 states and 62643 transitions. Second operand has 4 states, 4 states have (on average 30.5) internal successors, (122), 4 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:19,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:19,173 INFO L93 Difference]: Finished difference Result 87958 states and 101841 transitions. [2021-11-23 17:36:19,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:36:19,174 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 30.5) internal successors, (122), 4 states have internal predecessors, (122), 0 states have call successors, (0), 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 125 [2021-11-23 17:36:19,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:19,239 INFO L225 Difference]: With dead ends: 87958 [2021-11-23 17:36:19,239 INFO L226 Difference]: Without dead ends: 50156 [2021-11-23 17:36:19,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 352 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:36:19,257 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 62 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:19,257 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 280 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:36:19,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50156 states.