./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.13.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.13.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF --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 ec1cd52a445477adf7d2011977810418f8e00abf9d0587e75a609261005f64da --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:38:04,934 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:38:04,937 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:38:05,000 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:38:05,001 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:38:05,007 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:38:05,009 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:38:05,014 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:38:05,017 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:38:05,024 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:38:05,025 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:38:05,027 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:38:05,028 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:38:05,031 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:38:05,034 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:38:05,039 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:38:05,042 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:38:05,043 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:38:05,051 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:38:05,060 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:38:05,063 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:38:05,065 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:38:05,068 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:38:05,070 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:38:05,081 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:38:05,081 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:38:05,082 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:38:05,084 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:38:05,085 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:38:05,087 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:38:05,087 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:38:05,089 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:38:05,091 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:38:05,092 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:38:05,094 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:38:05,095 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:38:05,096 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:38:05,096 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:38:05,097 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:38:05,098 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:38:05,099 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:38:05,100 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 22:38:05,154 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:38:05,155 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:38:05,156 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:38:05,157 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:38:05,157 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:38:05,157 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:38:05,158 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:38:05,158 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 22:38:05,159 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:38:05,159 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:38:05,160 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 22:38:05,161 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 22:38:05,161 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:38:05,162 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 22:38:05,162 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 22:38:05,162 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 22:38:05,163 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:38:05,164 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:38:05,164 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 22:38:05,164 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:38:05,165 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:38:05,165 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:38:05,165 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:38:05,165 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:38:05,166 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:38:05,166 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:38:05,166 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:38:05,167 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:38:05,167 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:38:05,169 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:38:05,169 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:38:05,169 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:38:05,170 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:38:05,170 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:38:05,171 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:38:05,171 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 22:38:05,171 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 22:38:05,171 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:38:05,172 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:38:05,172 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:38:05,172 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_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ec1cd52a445477adf7d2011977810418f8e00abf9d0587e75a609261005f64da [2021-11-12 22:38:05,523 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:38:05,549 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:38:05,552 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:38:05,553 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:38:05,554 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:38:05,556 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.13.cil-2.c [2021-11-12 22:38:05,648 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/data/e973e68da/2f24bf98e416439ab7347a5dbb090f1b/FLAG43e3d8bd3 [2021-11-12 22:38:06,975 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:38:06,976 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/sv-benchmarks/c/combinations/Problem05_label45+token_ring.13.cil-2.c [2021-11-12 22:38:07,052 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/data/e973e68da/2f24bf98e416439ab7347a5dbb090f1b/FLAG43e3d8bd3 [2021-11-12 22:38:07,106 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/data/e973e68da/2f24bf98e416439ab7347a5dbb090f1b [2021-11-12 22:38:07,109 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:38:07,112 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:38:07,117 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:38:07,118 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:38:07,121 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:38:07,122 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:38:07" (1/1) ... [2021-11-12 22:38:07,124 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75dd789b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:07, skipping insertion in model container [2021-11-12 22:38:07,124 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:38:07" (1/1) ... [2021-11-12 22:38:07,133 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:38:07,512 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:38:10,664 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/sv-benchmarks/c/combinations/Problem05_label45+token_ring.13.cil-2.c[380323,380336] [2021-11-12 22:38:10,704 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/sv-benchmarks/c/combinations/Problem05_label45+token_ring.13.cil-2.c[383339,383352] [2021-11-12 22:38:11,088 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:38:11,103 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:38:12,695 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/sv-benchmarks/c/combinations/Problem05_label45+token_ring.13.cil-2.c[380323,380336] [2021-11-12 22:38:12,703 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/sv-benchmarks/c/combinations/Problem05_label45+token_ring.13.cil-2.c[383339,383352] [2021-11-12 22:38:12,759 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:38:12,862 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:38:12,862 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12 WrapperNode [2021-11-12 22:38:12,863 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:38:12,864 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:38:12,864 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:38:12,864 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:38:12,873 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12" (1/1) ... [2021-11-12 22:38:13,111 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12" (1/1) ... [2021-11-12 22:38:13,692 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:38:13,693 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:38:13,693 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:38:13,694 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:38:13,704 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12" (1/1) ... [2021-11-12 22:38:13,705 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12" (1/1) ... [2021-11-12 22:38:13,795 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12" (1/1) ... [2021-11-12 22:38:13,795 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12" (1/1) ... [2021-11-12 22:38:14,193 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12" (1/1) ... [2021-11-12 22:38:14,271 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12" (1/1) ... [2021-11-12 22:38:14,318 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12" (1/1) ... [2021-11-12 22:38:14,396 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:38:14,397 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:38:14,398 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:38:14,398 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:38:14,403 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12" (1/1) ... [2021-11-12 22:38:14,430 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:38:14,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:38:14,656 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:38:14,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:38:14,814 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:38:14,814 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-12 22:38:14,814 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-12 22:38:14,814 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-12 22:38:14,815 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-12 22:38:14,815 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-12 22:38:14,815 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-12 22:38:14,815 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-12 22:38:14,815 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-12 22:38:14,816 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-12 22:38:14,816 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-12 22:38:14,816 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-12 22:38:14,816 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-12 22:38:14,816 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 22:38:14,817 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:38:14,817 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:38:27,805 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:38:27,805 INFO L299 CfgBuilder]: Removed 17 assume(true) statements. [2021-11-12 22:38:27,813 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:38:27 BoogieIcfgContainer [2021-11-12 22:38:27,813 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:38:27,816 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:38:27,816 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:38:27,823 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:38:27,823 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:38:07" (1/3) ... [2021-11-12 22:38:27,824 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4912591 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:38:27, skipping insertion in model container [2021-11-12 22:38:27,824 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:38:12" (2/3) ... [2021-11-12 22:38:27,826 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4912591 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:38:27, skipping insertion in model container [2021-11-12 22:38:27,826 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:38:27" (3/3) ... [2021-11-12 22:38:27,828 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label45+token_ring.13.cil-2.c [2021-11-12 22:38:27,834 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:38:27,835 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-12 22:38:27,924 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:38:27,937 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 [2021-11-12 22:38:27,938 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-12 22:38:28,053 INFO L276 IsEmpty]: Start isEmpty. Operand has 1842 states, 1806 states have (on average 1.9540420819490587) internal successors, (3529), 1809 states have internal predecessors, (3529), 27 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-12 22:38:28,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-12 22:38:28,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:38:28,075 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:38:28,075 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:38:28,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:38:28,083 INFO L85 PathProgramCache]: Analyzing trace with hash -206575527, now seen corresponding path program 1 times [2021-11-12 22:38:28,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:38:28,095 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274925817] [2021-11-12 22:38:28,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:28,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:38:28,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:28,676 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:38:28,677 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:38:28,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274925817] [2021-11-12 22:38:28,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274925817] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:38:28,678 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:38:28,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:38:28,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147898939] [2021-11-12 22:38:28,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:38:28,686 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:38:28,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:38:28,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:38:28,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:38:28,772 INFO L87 Difference]: Start difference. First operand has 1842 states, 1806 states have (on average 1.9540420819490587) internal successors, (3529), 1809 states have internal predecessors, (3529), 27 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 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) [2021-11-12 22:38:30,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:38:30,123 INFO L93 Difference]: Finished difference Result 3866 states and 7483 transitions. [2021-11-12 22:38:30,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:38:30,126 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 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 70 [2021-11-12 22:38:30,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:38:30,168 INFO L225 Difference]: With dead ends: 3866 [2021-11-12 22:38:30,169 INFO L226 Difference]: Without dead ends: 2023 [2021-11-12 22:38:30,184 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 [2021-11-12 22:38:30,192 INFO L933 BasicCegarLoop]: 3541 mSDtfsCounter, 3812 mSDsluCounter, 3753 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 831.09ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3812 SdHoareTripleChecker+Valid, 6980 SdHoareTripleChecker+Invalid, 756 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 55.40ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1026.06ms IncrementalHoareTripleChecker+Time [2021-11-12 22:38:30,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3812 Valid, 6980 Invalid, 756 Unknown, 0 Unchecked, 55.40ms Time], IncrementalHoareTripleChecker [14 Valid, 742 Invalid, 0 Unknown, 0 Unchecked, 1026.06ms Time] [2021-11-12 22:38:30,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2023 states. [2021-11-12 22:38:30,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2023 to 2022. [2021-11-12 22:38:30,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2022 states, 1958 states have (on average 1.916241062308478) internal successors, (3752), 1961 states have internal predecessors, (3752), 50 states have call successors, (50), 12 states have call predecessors, (50), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-12 22:38:30,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2022 states to 2022 states and 3852 transitions. [2021-11-12 22:38:30,412 INFO L78 Accepts]: Start accepts. Automaton has 2022 states and 3852 transitions. Word has length 70 [2021-11-12 22:38:30,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:38:30,412 INFO L470 AbstractCegarLoop]: Abstraction has 2022 states and 3852 transitions. [2021-11-12 22:38:30,413 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 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) [2021-11-12 22:38:30,413 INFO L276 IsEmpty]: Start isEmpty. Operand 2022 states and 3852 transitions. [2021-11-12 22:38:30,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-12 22:38:30,435 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:38:30,435 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:38:30,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 22:38:30,437 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:38:30,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:38:30,439 INFO L85 PathProgramCache]: Analyzing trace with hash -951662237, now seen corresponding path program 1 times [2021-11-12 22:38:30,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:38:30,440 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815457284] [2021-11-12 22:38:30,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:30,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:38:30,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:30,708 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:38:30,708 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:38:30,709 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815457284] [2021-11-12 22:38:30,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815457284] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:30,709 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1951475389] [2021-11-12 22:38:30,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:30,710 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:30,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:38:30,712 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:38:30,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 22:38:31,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:31,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 1122 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:38:31,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:31,434 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-12 22:38:31,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:31,848 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-12 22:38:31,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1951475389] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:31,849 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:38:31,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:38:31,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071778170] [2021-11-12 22:38:31,851 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:38:31,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:38:31,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:38:31,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:38:31,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:31,854 INFO L87 Difference]: Start difference. First operand 2022 states and 3852 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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) [2021-11-12 22:38:32,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:38:32,558 INFO L93 Difference]: Finished difference Result 2767 states and 5025 transitions. [2021-11-12 22:38:32,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:38:32,568 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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 143 [2021-11-12 22:38:32,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:38:32,595 INFO L225 Difference]: With dead ends: 2767 [2021-11-12 22:38:32,595 INFO L226 Difference]: Without dead ends: 2391 [2021-11-12 22:38:32,599 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 283 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:32,600 INFO L933 BasicCegarLoop]: 3360 mSDtfsCounter, 3525 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 432.41ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3525 SdHoareTripleChecker+Valid, 3600 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 20.79ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 535.45ms IncrementalHoareTripleChecker+Time [2021-11-12 22:38:32,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3525 Valid, 3600 Invalid, 324 Unknown, 0 Unchecked, 20.79ms Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 535.45ms Time] [2021-11-12 22:38:32,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2391 states. [2021-11-12 22:38:32,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2391 to 2387. [2021-11-12 22:38:32,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2387 states, 2267 states have (on average 1.8619320688134098) internal successors, (4221), 2271 states have internal predecessors, (4221), 94 states have call successors, (94), 24 states have call predecessors, (94), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2021-11-12 22:38:32,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2387 states to 2387 states and 4409 transitions. [2021-11-12 22:38:32,737 INFO L78 Accepts]: Start accepts. Automaton has 2387 states and 4409 transitions. Word has length 143 [2021-11-12 22:38:32,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:38:32,739 INFO L470 AbstractCegarLoop]: Abstraction has 2387 states and 4409 transitions. [2021-11-12 22:38:32,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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) [2021-11-12 22:38:32,740 INFO L276 IsEmpty]: Start isEmpty. Operand 2387 states and 4409 transitions. [2021-11-12 22:38:32,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-12 22:38:32,753 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:38:32,754 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:38:32,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 22:38:32,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:32,971 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:38:32,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:38:32,972 INFO L85 PathProgramCache]: Analyzing trace with hash -1537680027, now seen corresponding path program 1 times [2021-11-12 22:38:32,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:38:32,972 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021442622] [2021-11-12 22:38:32,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:32,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:38:33,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:33,223 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:38:33,223 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:38:33,223 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021442622] [2021-11-12 22:38:33,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021442622] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:33,224 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569292637] [2021-11-12 22:38:33,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:33,225 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:33,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:38:33,227 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:38:33,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 22:38:33,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:33,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 1116 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:38:33,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:34,099 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-12 22:38:34,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:34,464 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-12 22:38:34,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569292637] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:34,465 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:38:34,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:38:34,465 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399293368] [2021-11-12 22:38:34,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:38:34,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:38:34,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:38:34,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:38:34,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:34,468 INFO L87 Difference]: Start difference. First operand 2387 states and 4409 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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) [2021-11-12 22:38:35,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:38:35,153 INFO L93 Difference]: Finished difference Result 3856 states and 6716 transitions. [2021-11-12 22:38:35,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:38:35,154 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 143 [2021-11-12 22:38:35,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:38:35,181 INFO L225 Difference]: With dead ends: 3856 [2021-11-12 22:38:35,182 INFO L226 Difference]: Without dead ends: 3115 [2021-11-12 22:38:35,187 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 283 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:35,188 INFO L933 BasicCegarLoop]: 3348 mSDtfsCounter, 3537 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 439.26ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3537 SdHoareTripleChecker+Valid, 3588 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 17.29ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 528.76ms IncrementalHoareTripleChecker+Time [2021-11-12 22:38:35,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3537 Valid, 3588 Invalid, 321 Unknown, 0 Unchecked, 17.29ms Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 528.76ms Time] [2021-11-12 22:38:35,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3115 states. [2021-11-12 22:38:35,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3115 to 3109. [2021-11-12 22:38:35,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3109 states, 2879 states have (on average 1.7877735324765545) internal successors, (5147), 2885 states have internal predecessors, (5147), 180 states have call successors, (180), 48 states have call predecessors, (180), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2021-11-12 22:38:35,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3109 states to 3109 states and 5507 transitions. [2021-11-12 22:38:35,351 INFO L78 Accepts]: Start accepts. Automaton has 3109 states and 5507 transitions. Word has length 143 [2021-11-12 22:38:35,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:38:35,351 INFO L470 AbstractCegarLoop]: Abstraction has 3109 states and 5507 transitions. [2021-11-12 22:38:35,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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) [2021-11-12 22:38:35,352 INFO L276 IsEmpty]: Start isEmpty. Operand 3109 states and 5507 transitions. [2021-11-12 22:38:35,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-12 22:38:35,360 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:38:35,360 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:38:35,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 22:38:35,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:35,582 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:38:35,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:38:35,583 INFO L85 PathProgramCache]: Analyzing trace with hash -1879900569, now seen corresponding path program 1 times [2021-11-12 22:38:35,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:38:35,584 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191524925] [2021-11-12 22:38:35,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:35,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:38:35,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:35,715 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:38:35,715 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:38:35,716 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191524925] [2021-11-12 22:38:35,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191524925] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:35,716 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536189816] [2021-11-12 22:38:35,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:35,717 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:35,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:38:35,718 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:38:35,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 22:38:35,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:35,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 1110 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:38:35,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:36,343 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-12 22:38:36,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:36,657 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-12 22:38:36,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536189816] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:36,658 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:38:36,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:38:36,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923427612] [2021-11-12 22:38:36,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:38:36,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:38:36,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:38:36,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:38:36,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:36,663 INFO L87 Difference]: Start difference. First operand 3109 states and 5507 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2021-11-12 22:38:37,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:38:37,376 INFO L93 Difference]: Finished difference Result 6010 states and 10048 transitions. [2021-11-12 22:38:37,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:38:37,377 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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 143 [2021-11-12 22:38:37,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:38:37,415 INFO L225 Difference]: With dead ends: 6010 [2021-11-12 22:38:37,416 INFO L226 Difference]: Without dead ends: 4547 [2021-11-12 22:38:37,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 283 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:37,425 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3519 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 417.38ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3519 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.72ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 500.40ms IncrementalHoareTripleChecker+Time [2021-11-12 22:38:37,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3519 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 13.72ms Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 500.40ms Time] [2021-11-12 22:38:37,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4547 states. [2021-11-12 22:38:37,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4547 to 4537. [2021-11-12 22:38:37,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4537 states, 4091 states have (on average 1.7049621119530678) internal successors, (6975), 4101 states have internal predecessors, (6975), 348 states have call successors, (348), 96 states have call predecessors, (348), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2021-11-12 22:38:37,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4537 states to 4537 states and 7671 transitions. [2021-11-12 22:38:37,668 INFO L78 Accepts]: Start accepts. Automaton has 4537 states and 7671 transitions. Word has length 143 [2021-11-12 22:38:37,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:38:37,668 INFO L470 AbstractCegarLoop]: Abstraction has 4537 states and 7671 transitions. [2021-11-12 22:38:37,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2021-11-12 22:38:37,669 INFO L276 IsEmpty]: Start isEmpty. Operand 4537 states and 7671 transitions. [2021-11-12 22:38:37,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-12 22:38:37,680 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:38:37,680 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:38:37,725 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 22:38:37,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:37,894 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:38:37,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:38:37,895 INFO L85 PathProgramCache]: Analyzing trace with hash -652428311, now seen corresponding path program 1 times [2021-11-12 22:38:37,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:38:37,895 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84412473] [2021-11-12 22:38:37,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:37,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:38:37,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:38,037 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:38:38,038 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:38:38,038 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84412473] [2021-11-12 22:38:38,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [84412473] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:38,038 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487513031] [2021-11-12 22:38:38,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:38,039 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:38,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:38:38,040 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:38:38,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 22:38:38,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:38,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 1104 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:38:38,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:38,747 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-12 22:38:38,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:39,342 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 22:38:39,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487513031] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:39,342 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:38:39,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:38:39,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541543629] [2021-11-12 22:38:39,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:38:39,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:38:39,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:38:39,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:38:39,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:39,346 INFO L87 Difference]: Start difference. First operand 4537 states and 7671 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2021-11-12 22:38:40,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:38:40,205 INFO L93 Difference]: Finished difference Result 10270 states and 16612 transitions. [2021-11-12 22:38:40,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:38:40,207 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 143 [2021-11-12 22:38:40,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:38:40,286 INFO L225 Difference]: With dead ends: 10270 [2021-11-12 22:38:40,286 INFO L226 Difference]: Without dead ends: 7379 [2021-11-12 22:38:40,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 283 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:40,307 INFO L933 BasicCegarLoop]: 3346 mSDtfsCounter, 3543 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 427.71ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3543 SdHoareTripleChecker+Valid, 3586 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 16.92ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 510.72ms IncrementalHoareTripleChecker+Time [2021-11-12 22:38:40,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3543 Valid, 3586 Invalid, 321 Unknown, 0 Unchecked, 16.92ms Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 510.72ms Time] [2021-11-12 22:38:40,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7379 states. [2021-11-12 22:38:40,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7379 to 7361. [2021-11-12 22:38:40,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7361 states, 6491 states have (on average 1.6304113387767678) internal successors, (10583), 6509 states have internal predecessors, (10583), 676 states have call successors, (676), 192 states have call predecessors, (676), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2021-11-12 22:38:40,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7361 states to 7361 states and 11935 transitions. [2021-11-12 22:38:40,858 INFO L78 Accepts]: Start accepts. Automaton has 7361 states and 11935 transitions. Word has length 143 [2021-11-12 22:38:40,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:38:40,859 INFO L470 AbstractCegarLoop]: Abstraction has 7361 states and 11935 transitions. [2021-11-12 22:38:40,860 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2021-11-12 22:38:40,860 INFO L276 IsEmpty]: Start isEmpty. Operand 7361 states and 11935 transitions. [2021-11-12 22:38:40,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-12 22:38:40,881 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:38:40,882 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:38:40,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 22:38:41,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:41,098 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:38:41,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:38:41,099 INFO L85 PathProgramCache]: Analyzing trace with hash 1084658539, now seen corresponding path program 1 times [2021-11-12 22:38:41,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:38:41,099 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528744206] [2021-11-12 22:38:41,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:41,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:38:41,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:41,266 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:38:41,266 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:38:41,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528744206] [2021-11-12 22:38:41,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528744206] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:41,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412128110] [2021-11-12 22:38:41,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:41,267 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:41,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:38:41,268 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:38:41,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 22:38:41,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:41,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 1098 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:38:41,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:41,883 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-12 22:38:41,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:42,199 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-12 22:38:42,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412128110] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:42,200 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:38:42,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:38:42,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039717236] [2021-11-12 22:38:42,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:38:42,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:38:42,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:38:42,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:38:42,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:42,203 INFO L87 Difference]: Start difference. First operand 7361 states and 11935 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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) [2021-11-12 22:38:43,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:38:43,319 INFO L93 Difference]: Finished difference Result 18694 states and 29540 transitions. [2021-11-12 22:38:43,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:38:43,320 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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 143 [2021-11-12 22:38:43,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:38:43,434 INFO L225 Difference]: With dead ends: 18694 [2021-11-12 22:38:43,434 INFO L226 Difference]: Without dead ends: 12979 [2021-11-12 22:38:43,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 283 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:43,477 INFO L933 BasicCegarLoop]: 3356 mSDtfsCounter, 3546 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 399.46ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3546 SdHoareTripleChecker+Valid, 3596 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 16.12ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 475.99ms IncrementalHoareTripleChecker+Time [2021-11-12 22:38:43,478 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3546 Valid, 3596 Invalid, 324 Unknown, 0 Unchecked, 16.12ms Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 475.99ms Time] [2021-11-12 22:38:43,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12979 states. [2021-11-12 22:38:44,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12979 to 12945. [2021-11-12 22:38:44,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12945 states, 11243 states have (on average 1.574579738503958) internal successors, (17703), 11277 states have internal predecessors, (17703), 1316 states have call successors, (1316), 384 states have call predecessors, (1316), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2021-11-12 22:38:44,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12945 states to 12945 states and 20335 transitions. [2021-11-12 22:38:44,296 INFO L78 Accepts]: Start accepts. Automaton has 12945 states and 20335 transitions. Word has length 143 [2021-11-12 22:38:44,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:38:44,297 INFO L470 AbstractCegarLoop]: Abstraction has 12945 states and 20335 transitions. [2021-11-12 22:38:44,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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) [2021-11-12 22:38:44,298 INFO L276 IsEmpty]: Start isEmpty. Operand 12945 states and 20335 transitions. [2021-11-12 22:38:44,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-12 22:38:44,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:38:44,337 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:38:44,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 22:38:44,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:44,554 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:38:44,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:38:44,555 INFO L85 PathProgramCache]: Analyzing trace with hash 578057385, now seen corresponding path program 1 times [2021-11-12 22:38:44,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:38:44,555 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443204452] [2021-11-12 22:38:44,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:44,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:38:44,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:44,670 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:38:44,670 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:38:44,670 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443204452] [2021-11-12 22:38:44,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443204452] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:44,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276104097] [2021-11-12 22:38:44,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:44,671 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:44,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:38:44,673 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:38:44,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 22:38:44,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:44,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 1092 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:38:44,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:45,343 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-12 22:38:45,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:45,666 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 22:38:45,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276104097] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:45,666 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:38:45,667 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:38:45,667 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305820211] [2021-11-12 22:38:45,667 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:38:45,668 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:38:45,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:38:45,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:38:45,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:45,669 INFO L87 Difference]: Start difference. First operand 12945 states and 20335 transitions. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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) [2021-11-12 22:38:47,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:38:47,196 INFO L93 Difference]: Finished difference Result 35350 states and 54996 transitions. [2021-11-12 22:38:47,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:38:47,197 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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 143 [2021-11-12 22:38:47,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:38:47,337 INFO L225 Difference]: With dead ends: 35350 [2021-11-12 22:38:47,342 INFO L226 Difference]: Without dead ends: 24051 [2021-11-12 22:38:47,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 283 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:47,400 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3516 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 418.67ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3516 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.61ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 497.05ms IncrementalHoareTripleChecker+Time [2021-11-12 22:38:47,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3516 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 14.61ms Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 497.05ms Time] [2021-11-12 22:38:47,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24051 states. [2021-11-12 22:38:48,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24051 to 23985. [2021-11-12 22:38:48,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23985 states, 20651 states have (on average 1.53750423708295) internal successors, (31751), 20717 states have internal predecessors, (31751), 2564 states have call successors, (2564), 768 states have call predecessors, (2564), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2021-11-12 22:38:48,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23985 states to 23985 states and 36879 transitions. [2021-11-12 22:38:48,865 INFO L78 Accepts]: Start accepts. Automaton has 23985 states and 36879 transitions. Word has length 143 [2021-11-12 22:38:48,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:38:48,867 INFO L470 AbstractCegarLoop]: Abstraction has 23985 states and 36879 transitions. [2021-11-12 22:38:48,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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) [2021-11-12 22:38:48,868 INFO L276 IsEmpty]: Start isEmpty. Operand 23985 states and 36879 transitions. [2021-11-12 22:38:48,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-12 22:38:48,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:38:48,933 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:38:48,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 22:38:49,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:49,146 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:38:49,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:38:49,147 INFO L85 PathProgramCache]: Analyzing trace with hash -831162777, now seen corresponding path program 1 times [2021-11-12 22:38:49,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:38:49,147 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652728079] [2021-11-12 22:38:49,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:49,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:38:49,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:49,437 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:38:49,437 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:38:49,437 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652728079] [2021-11-12 22:38:49,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652728079] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:49,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26007962] [2021-11-12 22:38:49,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:49,438 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:49,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:38:49,440 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:38:49,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 22:38:49,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:49,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:38:49,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:50,090 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-12 22:38:50,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:50,460 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-12 22:38:50,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26007962] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:38:50,461 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:38:50,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:38:50,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635014682] [2021-11-12 22:38:50,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:38:50,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:38:50,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:38:50,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:38:50,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:50,463 INFO L87 Difference]: Start difference. First operand 23985 states and 36879 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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) [2021-11-12 22:38:52,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:38:52,701 INFO L93 Difference]: Finished difference Result 68278 states and 105108 transitions. [2021-11-12 22:38:52,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:38:52,702 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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 143 [2021-11-12 22:38:52,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:38:52,983 INFO L225 Difference]: With dead ends: 68278 [2021-11-12 22:38:52,984 INFO L226 Difference]: Without dead ends: 45939 [2021-11-12 22:38:53,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 283 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:38:53,067 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3531 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 406.34ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3531 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.20ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 520.00ms IncrementalHoareTripleChecker+Time [2021-11-12 22:38:53,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3531 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 10.20ms Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 520.00ms Time] [2021-11-12 22:38:53,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45939 states. [2021-11-12 22:38:55,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45939 to 45809. [2021-11-12 22:38:55,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45809 states, 39275 states have (on average 1.514016549968173) internal successors, (59463), 39405 states have internal predecessors, (59463), 4996 states have call successors, (4996), 1536 states have call predecessors, (4996), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2021-11-12 22:38:55,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45809 states to 45809 states and 69455 transitions. [2021-11-12 22:38:55,762 INFO L78 Accepts]: Start accepts. Automaton has 45809 states and 69455 transitions. Word has length 143 [2021-11-12 22:38:55,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:38:55,762 INFO L470 AbstractCegarLoop]: Abstraction has 45809 states and 69455 transitions. [2021-11-12 22:38:55,763 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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) [2021-11-12 22:38:55,763 INFO L276 IsEmpty]: Start isEmpty. Operand 45809 states and 69455 transitions. [2021-11-12 22:38:55,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-12 22:38:55,948 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:38:55,949 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:38:55,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-12 22:38:56,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f865470e-4f4f-46c1-bf79-a0bde228d83f/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:56,162 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:38:56,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:38:56,163 INFO L85 PathProgramCache]: Analyzing trace with hash 2088042729, now seen corresponding path program 1 times [2021-11-12 22:38:56,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:38:56,163 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466771836] [2021-11-12 22:38:56,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:56,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:38:56,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:56,347 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 22:38:56,348 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:38:56,348 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466771836] [2021-11-12 22:38:56,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466771836] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:38:56,348 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:38:56,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 22:38:56,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076847055] [2021-11-12 22:38:56,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:38:56,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:38:56,353 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:38:56,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:38:56,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:38:56,354 INFO L87 Difference]: Start difference. First operand 45809 states and 69455 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 22:39:02,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:39:02,007 INFO L93 Difference]: Finished difference Result 156917 states and 235730 transitions. [2021-11-12 22:39:02,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 22:39:02,016 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 143 [2021-11-12 22:39:02,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:39:02,787 INFO L225 Difference]: With dead ends: 156917 [2021-11-12 22:39:02,787 INFO L226 Difference]: Without dead ends: 112755 [2021-11-12 22:39:02,948 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:39:02,951 INFO L933 BasicCegarLoop]: 3329 mSDtfsCounter, 4482 mSDsluCounter, 7126 mSDsCounter, 0 mSdLazyCounter, 949 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 978.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4504 SdHoareTripleChecker+Valid, 9930 SdHoareTripleChecker+Invalid, 1101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 40.39ms SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 949 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1149.97ms IncrementalHoareTripleChecker+Time [2021-11-12 22:39:02,952 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4504 Valid, 9930 Invalid, 1101 Unknown, 0 Unchecked, 40.39ms Time], IncrementalHoareTripleChecker [152 Valid, 949 Invalid, 0 Unknown, 0 Unchecked, 1149.97ms Time] [2021-11-12 22:39:03,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112755 states. [2021-11-12 22:39:08,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112755 to 88433. [2021-11-12 22:39:08,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88433 states, 75627 states have (on average 1.4988165602232006) internal successors, (113351), 75885 states have internal predecessors, (113351), 9732 states have call successors, (9732), 3072 states have call predecessors, (9732), 3072 states have return successors, (9732), 9476 states have call predecessors, (9732), 9732 states have call successors, (9732) [2021-11-12 22:39:08,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88433 states to 88433 states and 132815 transitions. [2021-11-12 22:39:08,566 INFO L78 Accepts]: Start accepts. Automaton has 88433 states and 132815 transitions. Word has length 143 [2021-11-12 22:39:08,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:39:08,568 INFO L470 AbstractCegarLoop]: Abstraction has 88433 states and 132815 transitions. [2021-11-12 22:39:08,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 22:39:08,569 INFO L276 IsEmpty]: Start isEmpty. Operand 88433 states and 132815 transitions. [2021-11-12 22:39:08,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-12 22:39:08,736 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:39:08,736 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:39:08,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-12 22:39:08,737 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:39:08,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:39:08,738 INFO L85 PathProgramCache]: Analyzing trace with hash 685534984, now seen corresponding path program 1 times [2021-11-12 22:39:08,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:39:08,738 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919049173] [2021-11-12 22:39:08,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:39:08,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:39:08,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:39:08,939 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 22:39:08,940 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:39:08,940 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919049173] [2021-11-12 22:39:08,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919049173] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:39:08,940 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:39:08,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 22:39:08,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860248227] [2021-11-12 22:39:08,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:39:08,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:39:08,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:39:08,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:39:08,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:39:08,943 INFO L87 Difference]: Start difference. First operand 88433 states and 132815 transitions. Second operand has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 22:39:16,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:39:16,872 INFO L93 Difference]: Finished difference Result 238325 states and 357457 transitions. [2021-11-12 22:39:16,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 22:39:16,873 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 144 [2021-11-12 22:39:16,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:39:17,572 INFO L225 Difference]: With dead ends: 238325 [2021-11-12 22:39:17,572 INFO L226 Difference]: Without dead ends: 151539 [2021-11-12 22:39:17,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:39:17,802 INFO L933 BasicCegarLoop]: 3321 mSDtfsCounter, 4313 mSDsluCounter, 7185 mSDsCounter, 0 mSdLazyCounter, 949 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 862.67ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4319 SdHoareTripleChecker+Valid, 9976 SdHoareTripleChecker+Invalid, 1109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 55.21ms SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 949 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1086.31ms IncrementalHoareTripleChecker+Time [2021-11-12 22:39:17,803 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4319 Valid, 9976 Invalid, 1109 Unknown, 0 Unchecked, 55.21ms Time], IncrementalHoareTripleChecker [160 Valid, 949 Invalid, 0 Unknown, 0 Unchecked, 1086.31ms Time] [2021-11-12 22:39:17,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151539 states. [2021-11-12 22:39:24,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151539 to 130801. [2021-11-12 22:39:24,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130801 states, 111723 states have (on average 1.4911790768239306) internal successors, (166599), 112109 states have internal predecessors, (166599), 14468 states have call successors, (14468), 4608 states have call predecessors, (14468), 4608 states have return successors, (14468), 14084 states have call predecessors, (14468), 14468 states have call successors, (14468) [2021-11-12 22:39:25,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130801 states to 130801 states and 195535 transitions. [2021-11-12 22:39:25,583 INFO L78 Accepts]: Start accepts. Automaton has 130801 states and 195535 transitions. Word has length 144 [2021-11-12 22:39:25,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:39:25,584 INFO L470 AbstractCegarLoop]: Abstraction has 130801 states and 195535 transitions. [2021-11-12 22:39:25,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 22:39:25,584 INFO L276 IsEmpty]: Start isEmpty. Operand 130801 states and 195535 transitions. [2021-11-12 22:39:25,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-12 22:39:25,820 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:39:25,820 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:39:25,821 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-12 22:39:25,821 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:39:25,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:39:25,822 INFO L85 PathProgramCache]: Analyzing trace with hash -1651239863, now seen corresponding path program 1 times [2021-11-12 22:39:25,822 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:39:25,822 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6018714] [2021-11-12 22:39:25,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:39:25,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:39:25,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:39:26,004 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 22:39:26,004 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:39:26,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6018714] [2021-11-12 22:39:26,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [6018714] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:39:26,005 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:39:26,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 22:39:26,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958582271] [2021-11-12 22:39:26,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:39:26,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:39:26,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:39:26,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:39:26,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:39:26,008 INFO L87 Difference]: Start difference. First operand 130801 states and 195535 transitions. Second operand has 6 states, 6 states have (on average 14.166666666666666) internal successors, (85), 6 states have internal predecessors, (85), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)