./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7 --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 d6bcae8fdfc31b6b7d4775dfad537e0ca42e395c3a990a218ee828052c4f57f7 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:29:19,037 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:29:19,040 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:29:19,072 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:29:19,073 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:29:19,074 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:29:19,076 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:29:19,078 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:29:19,080 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:29:19,081 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:29:19,083 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:29:19,084 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:29:19,085 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:29:19,086 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:29:19,088 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:29:19,089 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:29:19,090 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:29:19,091 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:29:19,094 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:29:19,096 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:29:19,098 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:29:19,100 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:29:19,102 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:29:19,103 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:29:19,107 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:29:19,107 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:29:19,108 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:29:19,109 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:29:19,110 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:29:19,111 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:29:19,111 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:29:19,112 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:29:19,113 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:29:19,114 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:29:19,115 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:29:19,116 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:29:19,117 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:29:19,117 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:29:19,117 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:29:19,119 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:29:19,119 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:29:19,120 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:29:19,146 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:29:19,147 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:29:19,147 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:29:19,147 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:29:19,148 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:29:19,148 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:29:19,148 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:29:19,148 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:29:19,149 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:29:19,149 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:29:19,149 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:29:19,149 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:29:19,149 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:29:19,149 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:29:19,150 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:29:19,150 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:29:19,150 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:29:19,150 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:29:19,151 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:29:19,151 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:29:19,151 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:29:19,151 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:29:19,152 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:29:19,152 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:29:19,152 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:29:19,152 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:29:19,152 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:29:19,153 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:29:19,153 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:29:19,153 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:29:19,153 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:29:19,153 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:29:19,154 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:29:19,154 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:29:19,154 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:29:19,154 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:29:19,154 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:29:19,155 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:29:19,155 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:29:19,155 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:29:19,155 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:29:19,155 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_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d6bcae8fdfc31b6b7d4775dfad537e0ca42e395c3a990a218ee828052c4f57f7 [2021-11-25 20:29:19,422 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:29:19,448 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:29:19,451 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:29:19,452 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:29:19,453 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:29:19,454 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-2.c [2021-11-25 20:29:19,527 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/data/3af810de7/47fae657c73b461681ecd609facb0155/FLAG885ed9986 [2021-11-25 20:29:20,640 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:29:20,641 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-2.c [2021-11-25 20:29:20,698 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/data/3af810de7/47fae657c73b461681ecd609facb0155/FLAG885ed9986 [2021-11-25 20:29:20,938 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/data/3af810de7/47fae657c73b461681ecd609facb0155 [2021-11-25 20:29:20,942 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:29:20,944 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:29:20,946 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:29:20,946 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:29:20,950 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:29:20,951 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:29:20" (1/1) ... [2021-11-25 20:29:20,952 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@501a6a2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:20, skipping insertion in model container [2021-11-25 20:29:20,953 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:29:20" (1/1) ... [2021-11-25 20:29:20,960 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:29:21,242 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:29:23,586 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_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-2.c[381679,381692] [2021-11-25 20:29:23,617 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_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-2.c[383339,383352] [2021-11-25 20:29:23,954 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:29:23,964 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:29:25,218 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_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-2.c[381679,381692] [2021-11-25 20:29:25,233 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_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/sv-benchmarks/c/combinations/Problem05_label43+token_ring.06.cil-2.c[383339,383352] [2021-11-25 20:29:25,253 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:29:25,329 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:29:25,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25 WrapperNode [2021-11-25 20:29:25,330 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:29:25,331 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:29:25,331 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:29:25,331 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:29:25,339 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25" (1/1) ... [2021-11-25 20:29:25,454 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25" (1/1) ... [2021-11-25 20:29:25,903 INFO L137 Inliner]: procedures = 56, calls = 59, calls flagged for inlining = 34, calls inlined = 34, statements flattened = 12851 [2021-11-25 20:29:25,904 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:29:25,905 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:29:25,906 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:29:25,906 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:29:25,916 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25" (1/1) ... [2021-11-25 20:29:25,916 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25" (1/1) ... [2021-11-25 20:29:25,984 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25" (1/1) ... [2021-11-25 20:29:25,984 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25" (1/1) ... [2021-11-25 20:29:26,310 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25" (1/1) ... [2021-11-25 20:29:26,361 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25" (1/1) ... [2021-11-25 20:29:26,388 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25" (1/1) ... [2021-11-25 20:29:26,470 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:29:26,471 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:29:26,471 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:29:26,471 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:29:26,485 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25" (1/1) ... [2021-11-25 20:29:26,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:29:26,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:26,566 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:29:26,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:29:26,684 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:29:26,684 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-25 20:29:26,684 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-25 20:29:26,684 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-25 20:29:26,684 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-25 20:29:26,684 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-25 20:29:26,685 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-25 20:29:26,685 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-25 20:29:26,685 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-25 20:29:26,685 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-25 20:29:26,685 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-25 20:29:26,685 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-25 20:29:26,685 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-25 20:29:26,685 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:29:26,685 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:29:26,687 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:29:26,853 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:29:26,855 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:29:34,302 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:29:36,610 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:29:36,611 INFO L301 CfgBuilder]: Removed 10 assume(true) statements. [2021-11-25 20:29:36,615 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:29:36 BoogieIcfgContainer [2021-11-25 20:29:36,615 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:29:36,617 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:29:36,618 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:29:36,621 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:29:36,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:29:20" (1/3) ... [2021-11-25 20:29:36,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fd7769b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:29:36, skipping insertion in model container [2021-11-25 20:29:36,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:29:25" (2/3) ... [2021-11-25 20:29:36,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fd7769b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:29:36, skipping insertion in model container [2021-11-25 20:29:36,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:29:36" (3/3) ... [2021-11-25 20:29:36,624 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label43+token_ring.06.cil-2.c [2021-11-25 20:29:36,629 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:29:36,629 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-25 20:29:36,686 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:29:36,692 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 [2021-11-25 20:29:36,692 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-25 20:29:36,753 INFO L276 IsEmpty]: Start isEmpty. Operand has 1765 states, 1736 states have (on average 1.9683179723502304) internal successors, (3417), 1739 states have internal predecessors, (3417), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-25 20:29:36,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 20:29:36,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:36,762 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, 1, 1, 1, 1] [2021-11-25 20:29:36,763 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:36,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:36,768 INFO L85 PathProgramCache]: Analyzing trace with hash 766094136, now seen corresponding path program 1 times [2021-11-25 20:29:36,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:36,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831745583] [2021-11-25 20:29:36,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:36,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:36,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:37,221 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:29:37,221 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:37,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831745583] [2021-11-25 20:29:37,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831745583] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:37,223 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:29:37,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:29:37,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769058701] [2021-11-25 20:29:37,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:37,229 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:29:37,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:37,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:29:37,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:29:37,264 INFO L87 Difference]: Start difference. First operand has 1765 states, 1736 states have (on average 1.9683179723502304) internal successors, (3417), 1739 states have internal predecessors, (3417), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 20:29:38,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:38,226 INFO L93 Difference]: Finished difference Result 3635 states and 7091 transitions. [2021-11-25 20:29:38,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:29:38,229 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 49 [2021-11-25 20:29:38,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:38,262 INFO L225 Difference]: With dead ends: 3635 [2021-11-25 20:29:38,263 INFO L226 Difference]: Without dead ends: 1869 [2021-11-25 20:29:38,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:29:38,281 INFO L933 BasicCegarLoop]: 3331 mSDtfsCounter, 3581 mSDsluCounter, 3529 mSDsCounter, 0 mSdLazyCounter, 630 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3581 SdHoareTripleChecker+Valid, 6588 SdHoareTripleChecker+Invalid, 644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 630 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:38,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3581 Valid, 6588 Invalid, 644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 630 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:29:38,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1869 states. [2021-11-25 20:29:38,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1869 to 1868. [2021-11-25 20:29:38,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1868 states, 1818 states have (on average 1.9405940594059405) internal successors, (3528), 1821 states have internal predecessors, (3528), 36 states have call successors, (36), 12 states have call predecessors, (36), 12 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2021-11-25 20:29:38,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1868 states to 1868 states and 3600 transitions. [2021-11-25 20:29:38,452 INFO L78 Accepts]: Start accepts. Automaton has 1868 states and 3600 transitions. Word has length 49 [2021-11-25 20:29:38,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:38,453 INFO L470 AbstractCegarLoop]: Abstraction has 1868 states and 3600 transitions. [2021-11-25 20:29:38,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 20:29:38,453 INFO L276 IsEmpty]: Start isEmpty. Operand 1868 states and 3600 transitions. [2021-11-25 20:29:38,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-25 20:29:38,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:38,461 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:38,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:29:38,462 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:38,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:38,463 INFO L85 PathProgramCache]: Analyzing trace with hash 1705013272, now seen corresponding path program 1 times [2021-11-25 20:29:38,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:38,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089220423] [2021-11-25 20:29:38,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:38,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:38,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:38,595 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:29:38,595 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:38,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089220423] [2021-11-25 20:29:38,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089220423] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:38,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052785033] [2021-11-25 20:29:38,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:38,597 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:38,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:38,606 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:38,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:29:38,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:38,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 630 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:29:38,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:39,012 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:29:39,015 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:29:39,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052785033] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:39,022 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:29:39,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 20:29:39,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226980406] [2021-11-25 20:29:39,029 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:39,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:39,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:39,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:39,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:29:39,034 INFO L87 Difference]: Start difference. First operand 1868 states and 3600 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:29:39,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:39,549 INFO L93 Difference]: Finished difference Result 2305 states and 4255 transitions. [2021-11-25 20:29:39,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:39,550 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-25 20:29:39,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:39,568 INFO L225 Difference]: With dead ends: 2305 [2021-11-25 20:29:39,568 INFO L226 Difference]: Without dead ends: 2083 [2021-11-25 20:29:39,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:29:39,571 INFO L933 BasicCegarLoop]: 3241 mSDtfsCounter, 3411 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3411 SdHoareTripleChecker+Valid, 3376 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:39,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3411 Valid, 3376 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:29:39,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2021-11-25 20:29:39,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 2079. [2021-11-25 20:29:39,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2079 states, 1987 states have (on average 1.898842476094615) internal successors, (3773), 1991 states have internal predecessors, (3773), 66 states have call successors, (66), 24 states have call predecessors, (66), 24 states have return successors, (66), 64 states have call predecessors, (66), 66 states have call successors, (66) [2021-11-25 20:29:39,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2079 states to 2079 states and 3905 transitions. [2021-11-25 20:29:39,668 INFO L78 Accepts]: Start accepts. Automaton has 2079 states and 3905 transitions. Word has length 94 [2021-11-25 20:29:39,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:39,668 INFO L470 AbstractCegarLoop]: Abstraction has 2079 states and 3905 transitions. [2021-11-25 20:29:39,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:29:39,669 INFO L276 IsEmpty]: Start isEmpty. Operand 2079 states and 3905 transitions. [2021-11-25 20:29:39,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-25 20:29:39,674 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:39,674 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:39,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:39,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:39,889 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:39,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:39,890 INFO L85 PathProgramCache]: Analyzing trace with hash -1723815688, now seen corresponding path program 1 times [2021-11-25 20:29:39,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:39,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311703539] [2021-11-25 20:29:39,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:39,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:39,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:40,074 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:29:40,074 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:40,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311703539] [2021-11-25 20:29:40,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1311703539] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:40,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1795894368] [2021-11-25 20:29:40,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:40,076 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:40,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:40,077 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:40,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:29:40,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:40,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:29:40,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:40,420 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:29:40,420 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:29:40,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1795894368] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:40,421 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:29:40,421 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 20:29:40,421 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921252721] [2021-11-25 20:29:40,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:40,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:40,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:40,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:40,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:29:40,424 INFO L87 Difference]: Start difference. First operand 2079 states and 3905 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:29:40,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:40,946 INFO L93 Difference]: Finished difference Result 2932 states and 5176 transitions. [2021-11-25 20:29:40,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:40,947 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-25 20:29:40,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:40,967 INFO L225 Difference]: With dead ends: 2932 [2021-11-25 20:29:40,968 INFO L226 Difference]: Without dead ends: 2499 [2021-11-25 20:29:40,971 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:29:40,972 INFO L933 BasicCegarLoop]: 3240 mSDtfsCounter, 3417 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3417 SdHoareTripleChecker+Valid, 3375 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:40,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3417 Valid, 3375 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:29:40,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2499 states. [2021-11-25 20:29:41,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2499 to 2493. [2021-11-25 20:29:41,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2493 states, 2319 states have (on average 1.833117723156533) internal successors, (4251), 2325 states have internal predecessors, (4251), 124 states have call successors, (124), 48 states have call predecessors, (124), 48 states have return successors, (124), 120 states have call predecessors, (124), 124 states have call successors, (124) [2021-11-25 20:29:41,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2493 states to 2493 states and 4499 transitions. [2021-11-25 20:29:41,093 INFO L78 Accepts]: Start accepts. Automaton has 2493 states and 4499 transitions. Word has length 94 [2021-11-25 20:29:41,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:41,094 INFO L470 AbstractCegarLoop]: Abstraction has 2493 states and 4499 transitions. [2021-11-25 20:29:41,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:29:41,095 INFO L276 IsEmpty]: Start isEmpty. Operand 2493 states and 4499 transitions. [2021-11-25 20:29:41,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-25 20:29:41,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:41,099 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:41,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:41,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:41,313 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:41,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:41,313 INFO L85 PathProgramCache]: Analyzing trace with hash 994752984, now seen corresponding path program 1 times [2021-11-25 20:29:41,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:41,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250917650] [2021-11-25 20:29:41,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:41,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:41,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:41,396 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:29:41,396 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:41,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250917650] [2021-11-25 20:29:41,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250917650] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:41,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1983749075] [2021-11-25 20:29:41,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:41,398 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:41,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:41,399 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:41,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:29:41,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:41,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:29:41,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:41,760 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 20:29:41,760 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:29:41,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1983749075] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:41,761 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:29:41,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 20:29:41,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091393529] [2021-11-25 20:29:41,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:41,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:41,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:41,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:41,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:29:41,764 INFO L87 Difference]: Start difference. First operand 2493 states and 4499 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:29:42,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:42,359 INFO L93 Difference]: Finished difference Result 4162 states and 6968 transitions. [2021-11-25 20:29:42,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:42,363 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-25 20:29:42,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:42,389 INFO L225 Difference]: With dead ends: 4162 [2021-11-25 20:29:42,389 INFO L226 Difference]: Without dead ends: 3315 [2021-11-25 20:29:42,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:29:42,399 INFO L933 BasicCegarLoop]: 3214 mSDtfsCounter, 3420 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3420 SdHoareTripleChecker+Valid, 3349 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:42,400 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3420 Valid, 3349 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:29:42,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3315 states. [2021-11-25 20:29:42,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3315 to 3305. [2021-11-25 20:29:42,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3305 states, 2971 states have (on average 1.7445304611242005) internal successors, (5183), 2981 states have internal predecessors, (5183), 236 states have call successors, (236), 96 states have call predecessors, (236), 96 states have return successors, (236), 228 states have call predecessors, (236), 236 states have call successors, (236) [2021-11-25 20:29:42,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3305 states to 3305 states and 5655 transitions. [2021-11-25 20:29:42,589 INFO L78 Accepts]: Start accepts. Automaton has 3305 states and 5655 transitions. Word has length 94 [2021-11-25 20:29:42,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:42,590 INFO L470 AbstractCegarLoop]: Abstraction has 3305 states and 5655 transitions. [2021-11-25 20:29:42,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:29:42,591 INFO L276 IsEmpty]: Start isEmpty. Operand 3305 states and 5655 transitions. [2021-11-25 20:29:42,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-25 20:29:42,603 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:42,604 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:29:42,641 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:42,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:42,829 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:42,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:42,829 INFO L85 PathProgramCache]: Analyzing trace with hash -324240136, now seen corresponding path program 1 times [2021-11-25 20:29:42,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:42,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223779459] [2021-11-25 20:29:42,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:42,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:42,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:42,945 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:29:42,945 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:42,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223779459] [2021-11-25 20:29:42,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223779459] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:42,946 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:29:42,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:29:42,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089399168] [2021-11-25 20:29:42,946 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:42,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:42,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:42,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:42,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:29:42,948 INFO L87 Difference]: Start difference. First operand 3305 states and 5655 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 20:29:43,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:43,528 INFO L93 Difference]: Finished difference Result 4595 states and 7568 transitions. [2021-11-25 20:29:43,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:43,529 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 94 [2021-11-25 20:29:43,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:43,560 INFO L225 Difference]: With dead ends: 4595 [2021-11-25 20:29:43,560 INFO L226 Difference]: Without dead ends: 3745 [2021-11-25 20:29:43,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:29:43,568 INFO L933 BasicCegarLoop]: 3276 mSDtfsCounter, 73 mSDsluCounter, 3444 mSDsCounter, 0 mSdLazyCounter, 504 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 6482 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:43,568 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 6482 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 504 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:29:43,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3745 states. [2021-11-25 20:29:43,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3745 to 3589. [2021-11-25 20:29:43,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3589 states, 3239 states have (on average 1.7409694350108058) internal successors, (5639), 3249 states have internal predecessors, (5639), 244 states have call successors, (244), 104 states have call predecessors, (244), 104 states have return successors, (244), 236 states have call predecessors, (244), 244 states have call successors, (244) [2021-11-25 20:29:43,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3589 states to 3589 states and 6127 transitions. [2021-11-25 20:29:43,729 INFO L78 Accepts]: Start accepts. Automaton has 3589 states and 6127 transitions. Word has length 94 [2021-11-25 20:29:43,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:43,732 INFO L470 AbstractCegarLoop]: Abstraction has 3589 states and 6127 transitions. [2021-11-25 20:29:43,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 20:29:43,733 INFO L276 IsEmpty]: Start isEmpty. Operand 3589 states and 6127 transitions. [2021-11-25 20:29:43,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-25 20:29:43,740 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:43,741 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:29:43,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 20:29:43,741 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:43,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:43,743 INFO L85 PathProgramCache]: Analyzing trace with hash 1165595330, now seen corresponding path program 1 times [2021-11-25 20:29:43,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:43,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800862332] [2021-11-25 20:29:43,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:43,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:43,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:43,849 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-25 20:29:43,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:43,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800862332] [2021-11-25 20:29:43,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800862332] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:43,850 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:29:43,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:29:43,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285848872] [2021-11-25 20:29:43,851 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:43,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:43,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:43,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:43,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:29:43,852 INFO L87 Difference]: Start difference. First operand 3589 states and 6127 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:29:44,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:44,415 INFO L93 Difference]: Finished difference Result 7402 states and 11820 transitions. [2021-11-25 20:29:44,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:44,415 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-25 20:29:44,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:44,453 INFO L225 Difference]: With dead ends: 7402 [2021-11-25 20:29:44,453 INFO L226 Difference]: Without dead ends: 5459 [2021-11-25 20:29:44,461 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:29:44,462 INFO L933 BasicCegarLoop]: 3216 mSDtfsCounter, 3409 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3409 SdHoareTripleChecker+Valid, 3351 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:44,462 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3409 Valid, 3351 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:29:44,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5459 states. [2021-11-25 20:29:44,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5459 to 5433. [2021-11-25 20:29:44,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5433 states, 4755 states have (on average 1.6502628811777076) internal successors, (7847), 4773 states have internal predecessors, (7847), 468 states have call successors, (468), 208 states have call predecessors, (468), 208 states have return successors, (468), 452 states have call predecessors, (468), 468 states have call successors, (468) [2021-11-25 20:29:44,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5433 states to 5433 states and 8783 transitions. [2021-11-25 20:29:44,709 INFO L78 Accepts]: Start accepts. Automaton has 5433 states and 8783 transitions. Word has length 126 [2021-11-25 20:29:44,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:44,709 INFO L470 AbstractCegarLoop]: Abstraction has 5433 states and 8783 transitions. [2021-11-25 20:29:44,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:29:44,710 INFO L276 IsEmpty]: Start isEmpty. Operand 5433 states and 8783 transitions. [2021-11-25 20:29:44,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-25 20:29:44,723 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:44,723 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:29:44,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 20:29:44,723 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:44,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:44,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1306688719, now seen corresponding path program 1 times [2021-11-25 20:29:44,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:44,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093697438] [2021-11-25 20:29:44,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:44,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:44,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:44,794 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-25 20:29:44,794 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:44,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093697438] [2021-11-25 20:29:44,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093697438] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:44,795 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:29:44,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:29:44,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495890519] [2021-11-25 20:29:44,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:44,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:44,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:44,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:44,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:29:44,797 INFO L87 Difference]: Start difference. First operand 5433 states and 8783 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:29:45,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:45,624 INFO L93 Difference]: Finished difference Result 12862 states and 19764 transitions. [2021-11-25 20:29:45,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:45,624 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-25 20:29:45,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:45,686 INFO L225 Difference]: With dead ends: 12862 [2021-11-25 20:29:45,686 INFO L226 Difference]: Without dead ends: 9075 [2021-11-25 20:29:45,700 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:29:45,700 INFO L933 BasicCegarLoop]: 3216 mSDtfsCounter, 3411 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3411 SdHoareTripleChecker+Valid, 3351 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:45,701 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3411 Valid, 3351 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:29:45,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9075 states. [2021-11-25 20:29:46,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9075 to 9025. [2021-11-25 20:29:46,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9025 states, 7707 states have (on average 1.5703905540417802) internal successors, (12103), 7741 states have internal predecessors, (12103), 900 states have call successors, (900), 416 states have call predecessors, (900), 416 states have return successors, (900), 868 states have call predecessors, (900), 900 states have call successors, (900) [2021-11-25 20:29:46,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9025 states to 9025 states and 13903 transitions. [2021-11-25 20:29:46,116 INFO L78 Accepts]: Start accepts. Automaton has 9025 states and 13903 transitions. Word has length 126 [2021-11-25 20:29:46,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:46,116 INFO L470 AbstractCegarLoop]: Abstraction has 9025 states and 13903 transitions. [2021-11-25 20:29:46,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:29:46,118 INFO L276 IsEmpty]: Start isEmpty. Operand 9025 states and 13903 transitions. [2021-11-25 20:29:46,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-25 20:29:46,142 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:46,143 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:29:46,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 20:29:46,143 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:46,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:46,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1529508560, now seen corresponding path program 1 times [2021-11-25 20:29:46,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:46,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034504542] [2021-11-25 20:29:46,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:46,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:46,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:46,212 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-25 20:29:46,213 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:46,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034504542] [2021-11-25 20:29:46,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034504542] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:46,213 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:29:46,213 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:29:46,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184509895] [2021-11-25 20:29:46,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:46,214 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:46,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:46,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:46,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:29:46,216 INFO L87 Difference]: Start difference. First operand 9025 states and 13903 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:29:47,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:47,108 INFO L93 Difference]: Finished difference Result 23494 states and 35060 transitions. [2021-11-25 20:29:47,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:47,109 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-25 20:29:47,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:47,176 INFO L225 Difference]: With dead ends: 23494 [2021-11-25 20:29:47,176 INFO L226 Difference]: Without dead ends: 16115 [2021-11-25 20:29:47,210 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:29:47,210 INFO L933 BasicCegarLoop]: 3230 mSDtfsCounter, 3414 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3414 SdHoareTripleChecker+Valid, 3365 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:47,211 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3414 Valid, 3365 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:29:47,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16115 states. [2021-11-25 20:29:47,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16115 to 16017. [2021-11-25 20:29:47,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16017 states, 13451 states have (on average 1.5088097539216414) internal successors, (20295), 13517 states have internal predecessors, (20295), 1732 states have call successors, (1732), 832 states have call predecessors, (1732), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2021-11-25 20:29:47,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16017 states to 16017 states and 23759 transitions. [2021-11-25 20:29:47,988 INFO L78 Accepts]: Start accepts. Automaton has 16017 states and 23759 transitions. Word has length 126 [2021-11-25 20:29:47,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:47,989 INFO L470 AbstractCegarLoop]: Abstraction has 16017 states and 23759 transitions. [2021-11-25 20:29:47,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:29:47,989 INFO L276 IsEmpty]: Start isEmpty. Operand 16017 states and 23759 transitions. [2021-11-25 20:29:48,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 20:29:48,048 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:48,049 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:29:48,049 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 20:29:48,049 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:48,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:48,050 INFO L85 PathProgramCache]: Analyzing trace with hash 1008342820, now seen corresponding path program 1 times [2021-11-25 20:29:48,050 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:48,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696876578] [2021-11-25 20:29:48,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:48,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:48,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:48,149 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-25 20:29:48,150 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:48,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696876578] [2021-11-25 20:29:48,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1696876578] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:48,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885717242] [2021-11-25 20:29:48,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:48,151 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:48,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:48,153 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:48,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:29:48,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:48,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 817 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:29:48,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:48,579 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 20:29:48,580 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:29:48,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885717242] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:48,581 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:29:48,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-25 20:29:48,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542229069] [2021-11-25 20:29:48,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:48,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:48,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:48,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:48,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:29:48,584 INFO L87 Difference]: Start difference. First operand 16017 states and 23759 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 20:29:49,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:49,702 INFO L93 Difference]: Finished difference Result 29013 states and 42769 transitions. [2021-11-25 20:29:49,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:49,702 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 145 [2021-11-25 20:29:49,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:49,791 INFO L225 Difference]: With dead ends: 29013 [2021-11-25 20:29:49,792 INFO L226 Difference]: Without dead ends: 21635 [2021-11-25 20:29:49,819 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:29:49,821 INFO L933 BasicCegarLoop]: 3305 mSDtfsCounter, 110 mSDsluCounter, 3445 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 6513 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:49,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 6513 Invalid, 508 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:29:49,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21635 states. [2021-11-25 20:29:50,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21635 to 18913. [2021-11-25 20:29:50,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18913 states, 16155 states have (on average 1.5355617455896007) internal successors, (24807), 16221 states have internal predecessors, (24807), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2021-11-25 20:29:50,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18913 states to 18913 states and 28463 transitions. [2021-11-25 20:29:50,799 INFO L78 Accepts]: Start accepts. Automaton has 18913 states and 28463 transitions. Word has length 145 [2021-11-25 20:29:50,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:50,799 INFO L470 AbstractCegarLoop]: Abstraction has 18913 states and 28463 transitions. [2021-11-25 20:29:50,799 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 20:29:50,800 INFO L276 IsEmpty]: Start isEmpty. Operand 18913 states and 28463 transitions. [2021-11-25 20:29:50,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 20:29:50,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:50,866 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:29:50,904 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:51,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 20:29:51,093 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:51,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:51,093 INFO L85 PathProgramCache]: Analyzing trace with hash -24938550, now seen corresponding path program 2 times [2021-11-25 20:29:51,093 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:51,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557231184] [2021-11-25 20:29:51,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:51,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:51,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:51,198 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 10 proven. 45 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 20:29:51,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:51,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557231184] [2021-11-25 20:29:51,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557231184] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:51,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999370573] [2021-11-25 20:29:51,199 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:29:51,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:51,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:51,200 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:51,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:29:51,345 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:29:51,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:29:51,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:29:51,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:51,597 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-25 20:29:51,597 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:29:51,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999370573] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:51,598 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:29:51,598 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:29:51,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540247960] [2021-11-25 20:29:51,598 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:51,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:51,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:51,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:51,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:29:51,600 INFO L87 Difference]: Start difference. First operand 18913 states and 28463 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 20:29:52,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:52,791 INFO L93 Difference]: Finished difference Result 29253 states and 44337 transitions. [2021-11-25 20:29:52,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:52,791 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 145 [2021-11-25 20:29:52,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:52,866 INFO L225 Difference]: With dead ends: 29253 [2021-11-25 20:29:52,866 INFO L226 Difference]: Without dead ends: 18979 [2021-11-25 20:29:52,901 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:29:52,901 INFO L933 BasicCegarLoop]: 3325 mSDtfsCounter, 141 mSDsluCounter, 3432 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 6518 SdHoareTripleChecker+Invalid, 515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:52,902 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 6518 Invalid, 515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 512 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:29:52,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18979 states. [2021-11-25 20:29:53,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18979 to 18849. [2021-11-25 20:29:53,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18849 states, 16091 states have (on average 1.5217823628115095) internal successors, (24487), 16157 states have internal predecessors, (24487), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2021-11-25 20:29:53,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18849 states to 18849 states and 28143 transitions. [2021-11-25 20:29:53,801 INFO L78 Accepts]: Start accepts. Automaton has 18849 states and 28143 transitions. Word has length 145 [2021-11-25 20:29:53,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:53,802 INFO L470 AbstractCegarLoop]: Abstraction has 18849 states and 28143 transitions. [2021-11-25 20:29:53,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 20:29:53,802 INFO L276 IsEmpty]: Start isEmpty. Operand 18849 states and 28143 transitions. [2021-11-25 20:29:53,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 20:29:53,856 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:53,857 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:29:53,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:54,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:29:54,081 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:54,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:54,081 INFO L85 PathProgramCache]: Analyzing trace with hash 455375052, now seen corresponding path program 1 times [2021-11-25 20:29:54,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:54,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235533614] [2021-11-25 20:29:54,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:54,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:54,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:54,195 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 20:29:54,195 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:54,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235533614] [2021-11-25 20:29:54,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1235533614] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:54,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1007845898] [2021-11-25 20:29:54,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:54,196 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:54,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:54,197 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:54,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:29:54,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:54,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 823 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:29:54,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:54,637 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 20:29:54,638 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:29:54,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1007845898] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:54,638 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:29:54,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:29:54,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029689803] [2021-11-25 20:29:54,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:54,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:54,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:54,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:54,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:29:54,643 INFO L87 Difference]: Start difference. First operand 18849 states and 28143 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 20:29:55,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:55,668 INFO L93 Difference]: Finished difference Result 27757 states and 41601 transitions. [2021-11-25 20:29:55,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:55,669 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 145 [2021-11-25 20:29:55,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:55,739 INFO L225 Difference]: With dead ends: 27757 [2021-11-25 20:29:55,739 INFO L226 Difference]: Without dead ends: 18915 [2021-11-25 20:29:55,767 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:29:55,768 INFO L933 BasicCegarLoop]: 3313 mSDtfsCounter, 138 mSDsluCounter, 3431 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 6505 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:55,768 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 6505 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 512 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:29:55,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18915 states. [2021-11-25 20:29:56,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18915 to 18689. [2021-11-25 20:29:56,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18689 states, 15931 states have (on average 1.5049274998430733) internal successors, (23975), 15997 states have internal predecessors, (23975), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2021-11-25 20:29:56,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18689 states to 18689 states and 27631 transitions. [2021-11-25 20:29:56,448 INFO L78 Accepts]: Start accepts. Automaton has 18689 states and 27631 transitions. Word has length 145 [2021-11-25 20:29:56,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:56,449 INFO L470 AbstractCegarLoop]: Abstraction has 18689 states and 27631 transitions. [2021-11-25 20:29:56,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 20:29:56,449 INFO L276 IsEmpty]: Start isEmpty. Operand 18689 states and 27631 transitions. [2021-11-25 20:29:56,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 20:29:56,488 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:56,488 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:29:56,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:56,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:56,705 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:56,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:56,705 INFO L85 PathProgramCache]: Analyzing trace with hash 1566905226, now seen corresponding path program 1 times [2021-11-25 20:29:56,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:56,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142813163] [2021-11-25 20:29:56,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:56,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:56,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:56,927 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 20:29:56,927 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:56,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142813163] [2021-11-25 20:29:56,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142813163] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:56,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467960296] [2021-11-25 20:29:56,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:56,928 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:56,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:56,929 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:56,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:29:57,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:57,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:29:57,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:29:57,365 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:29:57,365 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:29:57,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1467960296] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:29:57,366 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:29:57,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:29:57,366 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528310499] [2021-11-25 20:29:57,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:29:57,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:29:57,367 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:29:57,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:29:57,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:29:57,368 INFO L87 Difference]: Start difference. First operand 18689 states and 27631 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 20:29:58,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:29:58,340 INFO L93 Difference]: Finished difference Result 31061 states and 44714 transitions. [2021-11-25 20:29:58,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:29:58,341 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 145 [2021-11-25 20:29:58,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:29:58,420 INFO L225 Difference]: With dead ends: 31061 [2021-11-25 20:29:58,421 INFO L226 Difference]: Without dead ends: 22459 [2021-11-25 20:29:58,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:29:58,450 INFO L933 BasicCegarLoop]: 3220 mSDtfsCounter, 3417 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3417 SdHoareTripleChecker+Valid, 3259 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:29:58,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3417 Valid, 3259 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:29:58,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22459 states. [2021-11-25 20:29:59,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22459 to 22459. [2021-11-25 20:29:59,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22459 states, 19321 states have (on average 1.4494591377257906) internal successors, (28005), 19387 states have internal predecessors, (28005), 1954 states have call successors, (1954), 1182 states have call predecessors, (1954), 1182 states have return successors, (1954), 1890 states have call predecessors, (1954), 1954 states have call successors, (1954) [2021-11-25 20:29:59,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22459 states to 22459 states and 31913 transitions. [2021-11-25 20:29:59,278 INFO L78 Accepts]: Start accepts. Automaton has 22459 states and 31913 transitions. Word has length 145 [2021-11-25 20:29:59,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:29:59,279 INFO L470 AbstractCegarLoop]: Abstraction has 22459 states and 31913 transitions. [2021-11-25 20:29:59,279 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 20:29:59,279 INFO L276 IsEmpty]: Start isEmpty. Operand 22459 states and 31913 transitions. [2021-11-25 20:29:59,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-25 20:29:59,321 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:29:59,321 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:29:59,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:29:59,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:29:59,537 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:29:59,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:29:59,537 INFO L85 PathProgramCache]: Analyzing trace with hash 1174810063, now seen corresponding path program 1 times [2021-11-25 20:29:59,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:29:59,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [663887079] [2021-11-25 20:29:59,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:59,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:29:59,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:59,622 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 20:29:59,622 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:29:59,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [663887079] [2021-11-25 20:29:59,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [663887079] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:29:59,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [943683874] [2021-11-25 20:29:59,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:29:59,623 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:29:59,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:29:59,624 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:29:59,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:29:59,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:29:59,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 828 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 20:29:59,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:00,114 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:30:00,116 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:30:00,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [943683874] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:30:00,116 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:30:00,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-25 20:30:00,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374319820] [2021-11-25 20:30:00,117 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:30:00,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:30:00,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:00,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:30:00,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:30:00,119 INFO L87 Difference]: Start difference. First operand 22459 states and 31913 transitions. Second operand has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-25 20:30:01,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:01,870 INFO L93 Difference]: Finished difference Result 64557 states and 89721 transitions. [2021-11-25 20:30:01,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:30:01,871 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 146 [2021-11-25 20:30:01,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:02,032 INFO L225 Difference]: With dead ends: 64557 [2021-11-25 20:30:02,032 INFO L226 Difference]: Without dead ends: 43745 [2021-11-25 20:30:02,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:30:02,077 INFO L933 BasicCegarLoop]: 3357 mSDtfsCounter, 3435 mSDsluCounter, 3754 mSDsCounter, 0 mSdLazyCounter, 575 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3435 SdHoareTripleChecker+Valid, 6825 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:02,077 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3435 Valid, 6825 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 575 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:30:02,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43745 states. [2021-11-25 20:30:04,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43745 to 43679. [2021-11-25 20:30:04,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43679 states, 37413 states have (on average 1.4130115200598723) internal successors, (52865), 37607 states have internal predecessors, (52865), 3838 states have call successors, (3838), 2362 states have call predecessors, (3838), 2426 states have return successors, (4030), 3710 states have call predecessors, (4030), 3838 states have call successors, (4030) [2021-11-25 20:30:04,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43679 states to 43679 states and 60733 transitions. [2021-11-25 20:30:04,234 INFO L78 Accepts]: Start accepts. Automaton has 43679 states and 60733 transitions. Word has length 146 [2021-11-25 20:30:04,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:04,235 INFO L470 AbstractCegarLoop]: Abstraction has 43679 states and 60733 transitions. [2021-11-25 20:30:04,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-25 20:30:04,236 INFO L276 IsEmpty]: Start isEmpty. Operand 43679 states and 60733 transitions. [2021-11-25 20:30:04,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-25 20:30:04,346 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:04,347 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:30:04,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:04,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 20:30:04,573 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:04,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:04,573 INFO L85 PathProgramCache]: Analyzing trace with hash -331895380, now seen corresponding path program 1 times [2021-11-25 20:30:04,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:04,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304612903] [2021-11-25 20:30:04,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:04,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:04,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:04,681 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 20:30:04,681 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:04,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304612903] [2021-11-25 20:30:04,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1304612903] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:04,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1618732922] [2021-11-25 20:30:04,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:04,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:04,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:04,684 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:04,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:30:04,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:04,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:30:04,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:05,128 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 20:30:05,128 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:30:05,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1618732922] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:30:05,129 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:30:05,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:30:05,129 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814460902] [2021-11-25 20:30:05,130 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:30:05,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:30:05,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:05,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:30:05,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:30:05,131 INFO L87 Difference]: Start difference. First operand 43679 states and 60733 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 20:30:07,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:07,344 INFO L93 Difference]: Finished difference Result 101577 states and 142240 transitions. [2021-11-25 20:30:07,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:30:07,345 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 146 [2021-11-25 20:30:07,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:07,614 INFO L225 Difference]: With dead ends: 101577 [2021-11-25 20:30:07,614 INFO L226 Difference]: Without dead ends: 59545 [2021-11-25 20:30:07,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:30:07,698 INFO L933 BasicCegarLoop]: 3225 mSDtfsCounter, 75 mSDsluCounter, 3434 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 6422 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:07,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 6422 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:30:07,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59545 states. [2021-11-25 20:30:09,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59545 to 49227. [2021-11-25 20:30:09,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49227 states, 42571 states have (on average 1.438890324399239) internal successors, (61255), 42767 states have internal predecessors, (61255), 4033 states have call successors, (4033), 2557 states have call predecessors, (4033), 2621 states have return successors, (4225), 3903 states have call predecessors, (4225), 4033 states have call successors, (4225) [2021-11-25 20:30:10,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49227 states to 49227 states and 69513 transitions. [2021-11-25 20:30:10,092 INFO L78 Accepts]: Start accepts. Automaton has 49227 states and 69513 transitions. Word has length 146 [2021-11-25 20:30:10,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:10,092 INFO L470 AbstractCegarLoop]: Abstraction has 49227 states and 69513 transitions. [2021-11-25 20:30:10,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 20:30:10,093 INFO L276 IsEmpty]: Start isEmpty. Operand 49227 states and 69513 transitions. [2021-11-25 20:30:10,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-25 20:30:10,192 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:10,192 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:30:10,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:10,408 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:30:10,409 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:10,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:10,409 INFO L85 PathProgramCache]: Analyzing trace with hash 2001655277, now seen corresponding path program 1 times [2021-11-25 20:30:10,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:10,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517555432] [2021-11-25 20:30:10,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:10,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:10,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:10,513 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:30:10,513 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:10,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517555432] [2021-11-25 20:30:10,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1517555432] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:10,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915011767] [2021-11-25 20:30:10,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:10,514 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:10,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:10,515 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:10,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:30:10,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:10,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 832 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 20:30:10,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:11,218 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:30:11,219 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:30:11,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915011767] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:30:11,219 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:30:11,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-25 20:30:11,219 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406206329] [2021-11-25 20:30:11,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:30:11,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:30:11,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:11,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:30:11,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:30:11,221 INFO L87 Difference]: Start difference. First operand 49227 states and 69513 transitions. Second operand has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:30:13,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:13,579 INFO L93 Difference]: Finished difference Result 87102 states and 121700 transitions. [2021-11-25 20:30:13,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:30:13,580 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-25 20:30:13,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:13,688 INFO L225 Difference]: With dead ends: 87102 [2021-11-25 20:30:13,688 INFO L226 Difference]: Without dead ends: 39522 [2021-11-25 20:30:13,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:30:13,762 INFO L933 BasicCegarLoop]: 3209 mSDtfsCounter, 7086 mSDsluCounter, 6780 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7101 SdHoareTripleChecker+Valid, 9522 SdHoareTripleChecker+Invalid, 948 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:13,763 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7101 Valid, 9522 Invalid, 948 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:30:13,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39522 states. [2021-11-25 20:30:15,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39522 to 38140. [2021-11-25 20:30:15,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38140 states, 33039 states have (on average 1.4396622173794607) internal successors, (47565), 33202 states have internal predecessors, (47565), 3049 states have call successors, (3049), 1922 states have call predecessors, (3049), 2050 states have return successors, (3177), 3016 states have call predecessors, (3177), 3049 states have call successors, (3177) [2021-11-25 20:30:15,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38140 states to 38140 states and 53791 transitions. [2021-11-25 20:30:15,425 INFO L78 Accepts]: Start accepts. Automaton has 38140 states and 53791 transitions. Word has length 147 [2021-11-25 20:30:15,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:15,426 INFO L470 AbstractCegarLoop]: Abstraction has 38140 states and 53791 transitions. [2021-11-25 20:30:15,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:30:15,426 INFO L276 IsEmpty]: Start isEmpty. Operand 38140 states and 53791 transitions. [2021-11-25 20:30:15,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-25 20:30:15,506 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:15,507 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:30:15,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:15,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:15,733 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:15,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:15,733 INFO L85 PathProgramCache]: Analyzing trace with hash -755659643, now seen corresponding path program 2 times [2021-11-25 20:30:15,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:15,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117886820] [2021-11-25 20:30:15,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:15,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:15,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:15,833 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:30:15,833 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:15,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117886820] [2021-11-25 20:30:15,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1117886820] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:15,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [695615570] [2021-11-25 20:30:15,834 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:30:15,834 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:15,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:15,837 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:15,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:30:16,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:30:16,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:30:16,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:30:16,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:16,213 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:30:16,214 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:30:16,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [695615570] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:30:16,214 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:30:16,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 20:30:16,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394516592] [2021-11-25 20:30:16,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:30:16,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:30:16,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:16,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:30:16,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:30:16,217 INFO L87 Difference]: Start difference. First operand 38140 states and 53791 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 20:30:17,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:17,629 INFO L93 Difference]: Finished difference Result 50539 states and 71165 transitions. [2021-11-25 20:30:17,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:30:17,629 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 148 [2021-11-25 20:30:17,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:17,696 INFO L225 Difference]: With dead ends: 50539 [2021-11-25 20:30:17,696 INFO L226 Difference]: Without dead ends: 36572 [2021-11-25 20:30:17,724 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:30:17,725 INFO L933 BasicCegarLoop]: 3219 mSDtfsCounter, 40 mSDsluCounter, 3433 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 6415 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:17,725 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 6415 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:30:17,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36572 states. [2021-11-25 20:30:19,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36572 to 34460. [2021-11-25 20:30:19,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34460 states, 29743 states have (on average 1.4625626197760817) internal successors, (43501), 29810 states have internal predecessors, (43501), 2921 states have call successors, (2921), 1794 states have call predecessors, (2921), 1794 states have return successors, (2921), 2856 states have call predecessors, (2921), 2921 states have call successors, (2921) [2021-11-25 20:30:19,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34460 states to 34460 states and 49343 transitions. [2021-11-25 20:30:19,179 INFO L78 Accepts]: Start accepts. Automaton has 34460 states and 49343 transitions. Word has length 148 [2021-11-25 20:30:19,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:19,179 INFO L470 AbstractCegarLoop]: Abstraction has 34460 states and 49343 transitions. [2021-11-25 20:30:19,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 20:30:19,180 INFO L276 IsEmpty]: Start isEmpty. Operand 34460 states and 49343 transitions. [2021-11-25 20:30:19,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-25 20:30:19,252 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:19,252 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:30:19,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:19,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:30:19,481 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:19,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:19,481 INFO L85 PathProgramCache]: Analyzing trace with hash -1858732922, now seen corresponding path program 1 times [2021-11-25 20:30:19,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:19,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247843324] [2021-11-25 20:30:19,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:19,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:19,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:19,582 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 15 proven. 43 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:30:19,583 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:19,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247843324] [2021-11-25 20:30:19,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [247843324] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:19,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874455326] [2021-11-25 20:30:19,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:19,584 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:19,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:19,585 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:19,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:30:19,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:19,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 20:30:19,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:20,105 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 20:30:20,105 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:30:20,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874455326] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:30:20,106 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:30:20,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2021-11-25 20:30:20,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174686711] [2021-11-25 20:30:20,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:30:20,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:30:20,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:20,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:30:20,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:30:20,109 INFO L87 Difference]: Start difference. First operand 34460 states and 49343 transitions. Second operand has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:30:22,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:22,490 INFO L93 Difference]: Finished difference Result 82716 states and 117005 transitions. [2021-11-25 20:30:22,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:30:22,491 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 148 [2021-11-25 20:30:22,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:22,599 INFO L225 Difference]: With dead ends: 82716 [2021-11-25 20:30:22,599 INFO L226 Difference]: Without dead ends: 49954 [2021-11-25 20:30:22,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:30:22,639 INFO L933 BasicCegarLoop]: 3200 mSDtfsCounter, 7072 mSDsluCounter, 6769 mSDsCounter, 0 mSdLazyCounter, 797 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7087 SdHoareTripleChecker+Valid, 9503 SdHoareTripleChecker+Invalid, 929 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 797 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:22,639 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7087 Valid, 9503 Invalid, 929 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 797 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:30:22,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49954 states. [2021-11-25 20:30:24,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49954 to 49952. [2021-11-25 20:30:24,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49952 states, 42939 states have (on average 1.438529076131256) internal successors, (61769), 43038 states have internal predecessors, (61769), 4325 states have call successors, (4325), 2686 states have call predecessors, (4325), 2686 states have return successors, (4325), 4228 states have call predecessors, (4325), 4325 states have call successors, (4325) [2021-11-25 20:30:24,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49952 states to 49952 states and 70419 transitions. [2021-11-25 20:30:24,903 INFO L78 Accepts]: Start accepts. Automaton has 49952 states and 70419 transitions. Word has length 148 [2021-11-25 20:30:24,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:24,904 INFO L470 AbstractCegarLoop]: Abstraction has 49952 states and 70419 transitions. [2021-11-25 20:30:24,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:30:24,904 INFO L276 IsEmpty]: Start isEmpty. Operand 49952 states and 70419 transitions. [2021-11-25 20:30:24,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-25 20:30:24,965 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:24,965 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:30:24,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:25,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 20:30:25,167 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:25,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:25,167 INFO L85 PathProgramCache]: Analyzing trace with hash 1007218612, now seen corresponding path program 1 times [2021-11-25 20:30:25,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:25,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304050396] [2021-11-25 20:30:25,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:25,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:25,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:25,239 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 15 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 20:30:25,239 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:25,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304050396] [2021-11-25 20:30:25,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [304050396] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:25,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130669966] [2021-11-25 20:30:25,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:25,240 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:25,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:25,241 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:25,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:30:25,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:25,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 853 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 20:30:25,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:25,711 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-25 20:30:25,711 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:30:25,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130669966] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:30:25,711 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:30:25,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2021-11-25 20:30:25,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470561763] [2021-11-25 20:30:25,712 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:30:25,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:30:25,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:25,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:30:25,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:30:25,714 INFO L87 Difference]: Start difference. First operand 49952 states and 70419 transitions. Second operand has 6 states, 6 states have (on average 16.5) internal successors, (99), 6 states have internal predecessors, (99), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:30:29,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:30:29,152 INFO L93 Difference]: Finished difference Result 120784 states and 168585 transitions. [2021-11-25 20:30:29,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:30:29,153 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.5) internal successors, (99), 6 states have internal predecessors, (99), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 150 [2021-11-25 20:30:29,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:30:29,320 INFO L225 Difference]: With dead ends: 120784 [2021-11-25 20:30:29,320 INFO L226 Difference]: Without dead ends: 72530 [2021-11-25 20:30:29,378 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:30:29,378 INFO L933 BasicCegarLoop]: 3205 mSDtfsCounter, 3717 mSDsluCounter, 6848 mSDsCounter, 0 mSdLazyCounter, 830 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3732 SdHoareTripleChecker+Valid, 9572 SdHoareTripleChecker+Invalid, 945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:30:29,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3732 Valid, 9572 Invalid, 945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 830 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:30:29,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72530 states. [2021-11-25 20:30:32,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72530 to 72528. [2021-11-25 20:30:32,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72528 states, 62099 states have (on average 1.4142739818676628) internal successors, (87825), 62246 states have internal predecessors, (87825), 6405 states have call successors, (6405), 4022 states have call predecessors, (6405), 4022 states have return successors, (6405), 6260 states have call predecessors, (6405), 6405 states have call successors, (6405) [2021-11-25 20:30:32,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72528 states to 72528 states and 100635 transitions. [2021-11-25 20:30:32,640 INFO L78 Accepts]: Start accepts. Automaton has 72528 states and 100635 transitions. Word has length 150 [2021-11-25 20:30:32,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:30:32,641 INFO L470 AbstractCegarLoop]: Abstraction has 72528 states and 100635 transitions. [2021-11-25 20:30:32,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.5) internal successors, (99), 6 states have internal predecessors, (99), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-25 20:30:32,641 INFO L276 IsEmpty]: Start isEmpty. Operand 72528 states and 100635 transitions. [2021-11-25 20:30:32,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-25 20:30:32,745 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:30:32,745 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 20:30:32,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:30:32,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 20:30:32,945 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:30:32,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:30:32,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1971139359, now seen corresponding path program 1 times [2021-11-25 20:30:32,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:30:32,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312513655] [2021-11-25 20:30:32,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:32,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:30:32,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:33,011 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 20:30:33,011 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:30:33,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312513655] [2021-11-25 20:30:33,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [312513655] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:30:33,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527478100] [2021-11-25 20:30:33,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:30:33,012 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:30:33,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:30:33,029 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:30:33,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4f0fef0-8ff7-451e-8fa5-dc7f3c7ff926/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:30:33,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:30:33,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 20:30:33,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:30:33,386 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 20:30:33,387 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:30:33,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527478100] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:30:33,387 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:30:33,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-25 20:30:33,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800896538] [2021-11-25 20:30:33,388 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:30:33,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:30:33,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:30:33,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:30:33,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:30:33,389 INFO L87 Difference]: Start difference. First operand 72528 states and 100635 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11)