./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V --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 2e77838346608929bef5ad1e655ea0710d74ebb9f10b29169ab985d305812d92 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:56:10,922 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:56:10,925 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:56:10,978 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:56:10,979 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:56:10,985 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:56:10,987 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:56:10,989 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:56:10,992 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:56:10,993 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:56:10,995 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:56:10,996 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:56:10,997 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:56:10,999 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:56:11,001 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:56:11,003 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:56:11,004 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:56:11,005 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:56:11,008 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:56:11,011 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:56:11,014 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:56:11,028 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:56:11,030 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:56:11,031 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:56:11,036 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:56:11,036 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:56:11,037 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:56:11,038 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:56:11,039 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:56:11,041 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:56:11,041 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:56:11,042 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:56:11,044 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:56:11,045 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:56:11,046 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:56:11,047 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:56:11,048 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:56:11,048 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:56:11,048 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:56:11,050 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:56:11,051 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:56:11,052 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:56:11,082 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:56:11,082 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:56:11,083 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:56:11,083 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:56:11,084 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:56:11,084 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:56:11,084 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:56:11,085 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:56:11,085 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:56:11,085 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:56:11,085 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:56:11,086 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:56:11,086 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:56:11,086 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:56:11,086 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:56:11,087 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:56:11,087 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:56:11,087 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:56:11,088 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:56:11,088 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:56:11,088 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:56:11,089 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:56:11,089 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:56:11,089 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:56:11,089 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:56:11,090 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:56:11,090 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:56:11,090 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:56:11,090 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:56:11,091 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:56:11,091 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:56:11,091 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:56:11,091 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:56:11,092 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:56:11,092 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:56:11,092 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:56:11,092 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:56:11,093 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:56:11,093 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:56:11,093 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:56:11,093 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:56:11,094 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_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e77838346608929bef5ad1e655ea0710d74ebb9f10b29169ab985d305812d92 [2021-11-23 02:56:11,380 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:56:11,408 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:56:11,410 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:56:11,412 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:56:11,414 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:56:11,415 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c [2021-11-23 02:56:11,506 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/data/7f4da3ad8/01c9ed98e35c423fbdd4b08df6f63ccc/FLAG56cf48637 [2021-11-23 02:56:12,226 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:56:12,227 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c [2021-11-23 02:56:12,275 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/data/7f4da3ad8/01c9ed98e35c423fbdd4b08df6f63ccc/FLAG56cf48637 [2021-11-23 02:56:12,384 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/data/7f4da3ad8/01c9ed98e35c423fbdd4b08df6f63ccc [2021-11-23 02:56:12,391 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:56:12,394 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:56:12,397 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:56:12,398 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:56:12,403 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:56:12,404 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:56:12" (1/1) ... [2021-11-23 02:56:12,407 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d4fe298 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:12, skipping insertion in model container [2021-11-23 02:56:12,408 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:56:12" (1/1) ... [2021-11-23 02:56:12,419 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:56:12,531 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:56:12,740 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c[1546,1559] [2021-11-23 02:56:13,202 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:56:13,213 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:56:13,227 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c[1546,1559] [2021-11-23 02:56:13,343 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:56:13,394 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:56:13,394 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13 WrapperNode [2021-11-23 02:56:13,395 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:56:13,396 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:56:13,396 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:56:13,396 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:56:13,405 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13" (1/1) ... [2021-11-23 02:56:13,456 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13" (1/1) ... [2021-11-23 02:56:13,549 INFO L137 Inliner]: procedures = 95, calls = 348, calls flagged for inlining = 28, calls inlined = 25, statements flattened = 917 [2021-11-23 02:56:13,549 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:56:13,560 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:56:13,560 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:56:13,560 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:56:13,569 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13" (1/1) ... [2021-11-23 02:56:13,570 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13" (1/1) ... [2021-11-23 02:56:13,578 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13" (1/1) ... [2021-11-23 02:56:13,578 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13" (1/1) ... [2021-11-23 02:56:13,625 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13" (1/1) ... [2021-11-23 02:56:13,679 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13" (1/1) ... [2021-11-23 02:56:13,685 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13" (1/1) ... [2021-11-23 02:56:13,696 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:56:13,697 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:56:13,697 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:56:13,698 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:56:13,699 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13" (1/1) ... [2021-11-23 02:56:13,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:56:13,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:13,746 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:56:13,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:56:13,810 INFO L130 BoogieDeclarations]: Found specification of procedure angelinaCall [2021-11-23 02:56:13,810 INFO L138 BoogieDeclarations]: Found implementation of procedure angelinaCall [2021-11-23 02:56:13,810 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:56:13,811 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2021-11-23 02:56:13,811 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2021-11-23 02:56:13,811 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2021-11-23 02:56:13,812 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2021-11-23 02:56:13,812 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-23 02:56:13,813 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-23 02:56:13,813 INFO L130 BoogieDeclarations]: Found specification of procedure existInLiftCallsInDirection [2021-11-23 02:56:13,813 INFO L138 BoogieDeclarations]: Found implementation of procedure existInLiftCallsInDirection [2021-11-23 02:56:13,813 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-23 02:56:13,814 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-23 02:56:13,814 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2021-11-23 02:56:13,814 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2021-11-23 02:56:13,814 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-23 02:56:13,815 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-23 02:56:13,815 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2021-11-23 02:56:13,815 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2021-11-23 02:56:13,815 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-23 02:56:13,816 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-23 02:56:13,816 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__empty [2021-11-23 02:56:13,816 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__empty [2021-11-23 02:56:13,817 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-23 02:56:13,817 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-23 02:56:13,817 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-23 02:56:13,818 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-23 02:56:13,818 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-23 02:56:13,818 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-23 02:56:13,818 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-23 02:56:13,819 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-23 02:56:13,821 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-23 02:56:13,821 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-23 02:56:13,821 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-23 02:56:13,821 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-23 02:56:13,823 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-23 02:56:13,823 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-23 02:56:13,823 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-23 02:56:13,823 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-23 02:56:13,824 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-23 02:56:13,824 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-23 02:56:13,824 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-23 02:56:13,824 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-23 02:56:13,825 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-23 02:56:13,826 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-23 02:56:13,826 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-23 02:56:13,827 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-23 02:56:13,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:56:13,828 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-23 02:56:13,829 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-23 02:56:13,830 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-23 02:56:13,831 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-23 02:56:13,831 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-23 02:56:13,831 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-23 02:56:13,832 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-23 02:56:13,832 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-23 02:56:13,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:56:13,832 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:56:13,833 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-23 02:56:13,833 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-23 02:56:14,106 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:56:14,109 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:56:15,481 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:56:16,208 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:56:16,208 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-23 02:56:16,216 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:56:16 BoogieIcfgContainer [2021-11-23 02:56:16,216 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:56:16,220 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:56:16,220 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:56:16,224 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:56:16,224 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:56:12" (1/3) ... [2021-11-23 02:56:16,225 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@164dd0c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:56:16, skipping insertion in model container [2021-11-23 02:56:16,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:13" (2/3) ... [2021-11-23 02:56:16,226 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@164dd0c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:56:16, skipping insertion in model container [2021-11-23 02:56:16,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:56:16" (3/3) ... [2021-11-23 02:56:16,228 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec13_product31.cil.c [2021-11-23 02:56:16,237 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:56:16,238 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:56:16,321 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:56:16,332 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:56:16,332 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:56:16,398 INFO L276 IsEmpty]: Start isEmpty. Operand has 436 states, 298 states have (on average 1.5771812080536913) internal successors, (470), 316 states have internal predecessors, (470), 108 states have call successors, (108), 28 states have call predecessors, (108), 28 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) [2021-11-23 02:56:16,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 02:56:16,445 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:16,446 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:16,447 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:16,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:16,454 INFO L85 PathProgramCache]: Analyzing trace with hash -1508479094, now seen corresponding path program 1 times [2021-11-23 02:56:16,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:16,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624865880] [2021-11-23 02:56:16,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:16,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:16,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:17,058 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:56:17,059 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:17,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624865880] [2021-11-23 02:56:17,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624865880] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:17,060 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:56:17,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:56:17,062 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085560931] [2021-11-23 02:56:17,063 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:17,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:56:17,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:17,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:56:17,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:56:17,103 INFO L87 Difference]: Start difference. First operand has 436 states, 298 states have (on average 1.5771812080536913) internal successors, (470), 316 states have internal predecessors, (470), 108 states have call successors, (108), 28 states have call predecessors, (108), 28 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) Second operand has 5 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 3 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:56:18,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:18,097 INFO L93 Difference]: Finished difference Result 1276 states and 2046 transitions. [2021-11-23 02:56:18,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:56:18,103 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 3 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 96 [2021-11-23 02:56:18,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:18,138 INFO L225 Difference]: With dead ends: 1276 [2021-11-23 02:56:18,139 INFO L226 Difference]: Without dead ends: 845 [2021-11-23 02:56:18,152 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:56:18,161 INFO L933 BasicCegarLoop]: 878 mSDtfsCounter, 650 mSDsluCounter, 2284 mSDsCounter, 0 mSdLazyCounter, 415 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 650 SdHoareTripleChecker+Valid, 3043 SdHoareTripleChecker+Invalid, 428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:18,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [650 Valid, 3043 Invalid, 428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 415 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:56:18,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 845 states. [2021-11-23 02:56:18,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 845 to 837. [2021-11-23 02:56:18,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 837 states, 579 states have (on average 1.5613126079447324) internal successors, (904), 609 states have internal predecessors, (904), 206 states have call successors, (206), 54 states have call predecessors, (206), 51 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2021-11-23 02:56:18,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1320 transitions. [2021-11-23 02:56:18,350 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1320 transitions. Word has length 96 [2021-11-23 02:56:18,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:18,351 INFO L470 AbstractCegarLoop]: Abstraction has 837 states and 1320 transitions. [2021-11-23 02:56:18,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 3 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:56:18,352 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1320 transitions. [2021-11-23 02:56:18,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 02:56:18,365 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:18,365 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:18,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:56:18,366 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:18,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:18,367 INFO L85 PathProgramCache]: Analyzing trace with hash -491790775, now seen corresponding path program 1 times [2021-11-23 02:56:18,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:18,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1589875874] [2021-11-23 02:56:18,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:18,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:18,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:18,627 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:56:18,627 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:18,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1589875874] [2021-11-23 02:56:18,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1589875874] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:18,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277149096] [2021-11-23 02:56:18,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:18,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:18,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:18,633 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:18,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:56:19,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:19,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 1359 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:56:19,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:19,349 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:56:19,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:19,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277149096] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:19,350 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:19,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 4 [2021-11-23 02:56:19,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138444067] [2021-11-23 02:56:19,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:19,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:56:19,353 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:19,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:56:19,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:56:19,354 INFO L87 Difference]: Start difference. First operand 837 states and 1320 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-23 02:56:19,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:19,571 INFO L93 Difference]: Finished difference Result 1671 states and 2655 transitions. [2021-11-23 02:56:19,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:56:19,572 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 100 [2021-11-23 02:56:19,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:19,583 INFO L225 Difference]: With dead ends: 1671 [2021-11-23 02:56:19,583 INFO L226 Difference]: Without dead ends: 849 [2021-11-23 02:56:19,589 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:56:19,591 INFO L933 BasicCegarLoop]: 626 mSDtfsCounter, 85 mSDsluCounter, 1238 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 1791 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:19,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 1791 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:56:19,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 849 states. [2021-11-23 02:56:19,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 849 to 849. [2021-11-23 02:56:19,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 849 states, 589 states have (on average 1.5551782682512734) internal successors, (916), 619 states have internal predecessors, (916), 206 states have call successors, (206), 56 states have call predecessors, (206), 53 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2021-11-23 02:56:19,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 849 states to 849 states and 1332 transitions. [2021-11-23 02:56:19,693 INFO L78 Accepts]: Start accepts. Automaton has 849 states and 1332 transitions. Word has length 100 [2021-11-23 02:56:19,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:19,696 INFO L470 AbstractCegarLoop]: Abstraction has 849 states and 1332 transitions. [2021-11-23 02:56:19,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-23 02:56:19,697 INFO L276 IsEmpty]: Start isEmpty. Operand 849 states and 1332 transitions. [2021-11-23 02:56:19,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 02:56:19,709 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:19,710 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:19,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:19,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:19,917 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:19,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:19,918 INFO L85 PathProgramCache]: Analyzing trace with hash -726697280, now seen corresponding path program 1 times [2021-11-23 02:56:19,918 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:19,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837954894] [2021-11-23 02:56:19,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:19,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:19,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:20,050 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:56:20,051 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:20,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837954894] [2021-11-23 02:56:20,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837954894] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:20,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707043128] [2021-11-23 02:56:20,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:20,052 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:20,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:20,056 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:20,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:56:20,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:20,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 1364 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:56:20,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:20,591 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:56:20,591 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:20,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [707043128] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:20,592 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:20,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-23 02:56:20,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437434600] [2021-11-23 02:56:20,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:20,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:56:20,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:20,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:56:20,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:56:20,597 INFO L87 Difference]: Start difference. First operand 849 states and 1332 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-23 02:56:20,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:20,783 INFO L93 Difference]: Finished difference Result 1689 states and 2665 transitions. [2021-11-23 02:56:20,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:56:20,784 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 102 [2021-11-23 02:56:20,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:20,792 INFO L225 Difference]: With dead ends: 1689 [2021-11-23 02:56:20,792 INFO L226 Difference]: Without dead ends: 847 [2021-11-23 02:56:20,799 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:56:20,800 INFO L933 BasicCegarLoop]: 625 mSDtfsCounter, 91 mSDsluCounter, 1234 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 1787 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:20,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 1787 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:56:20,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 847 states. [2021-11-23 02:56:20,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 847 to 847. [2021-11-23 02:56:20,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 847 states, 587 states have (on average 1.546848381601363) internal successors, (908), 617 states have internal predecessors, (908), 206 states have call successors, (206), 56 states have call predecessors, (206), 53 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2021-11-23 02:56:20,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 847 states to 847 states and 1324 transitions. [2021-11-23 02:56:20,866 INFO L78 Accepts]: Start accepts. Automaton has 847 states and 1324 transitions. Word has length 102 [2021-11-23 02:56:20,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:20,867 INFO L470 AbstractCegarLoop]: Abstraction has 847 states and 1324 transitions. [2021-11-23 02:56:20,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-23 02:56:20,867 INFO L276 IsEmpty]: Start isEmpty. Operand 847 states and 1324 transitions. [2021-11-23 02:56:20,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 02:56:20,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:20,873 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:20,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:21,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-23 02:56:21,088 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:21,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:21,089 INFO L85 PathProgramCache]: Analyzing trace with hash -583352978, now seen corresponding path program 1 times [2021-11-23 02:56:21,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:21,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267996196] [2021-11-23 02:56:21,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:21,090 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:21,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:21,213 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:56:21,214 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:21,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267996196] [2021-11-23 02:56:21,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267996196] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:21,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256005425] [2021-11-23 02:56:21,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:21,215 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:21,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:21,216 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:21,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:56:21,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:21,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 1368 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:56:21,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:21,762 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:56:21,762 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:21,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [256005425] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:21,763 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:21,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2021-11-23 02:56:21,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719391720] [2021-11-23 02:56:21,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:21,764 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:56:21,764 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:21,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:56:21,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:56:21,765 INFO L87 Difference]: Start difference. First operand 847 states and 1324 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-23 02:56:22,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:22,804 INFO L93 Difference]: Finished difference Result 2071 states and 3280 transitions. [2021-11-23 02:56:22,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:56:22,805 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 103 [2021-11-23 02:56:22,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:22,816 INFO L225 Difference]: With dead ends: 2071 [2021-11-23 02:56:22,817 INFO L226 Difference]: Without dead ends: 1239 [2021-11-23 02:56:22,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:56:22,826 INFO L933 BasicCegarLoop]: 774 mSDtfsCounter, 640 mSDsluCounter, 1676 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 643 SdHoareTripleChecker+Valid, 2352 SdHoareTripleChecker+Invalid, 940 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:22,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [643 Valid, 2352 Invalid, 940 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:56:22,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1239 states. [2021-11-23 02:56:22,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1239 to 1219. [2021-11-23 02:56:22,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1219 states, 844 states have (on average 1.4928909952606635) internal successors, (1260), 889 states have internal predecessors, (1260), 294 states have call successors, (294), 84 states have call predecessors, (294), 80 states have return successors, (322), 282 states have call predecessors, (322), 289 states have call successors, (322) [2021-11-23 02:56:22,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1219 states to 1219 states and 1876 transitions. [2021-11-23 02:56:22,911 INFO L78 Accepts]: Start accepts. Automaton has 1219 states and 1876 transitions. Word has length 103 [2021-11-23 02:56:22,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:22,912 INFO L470 AbstractCegarLoop]: Abstraction has 1219 states and 1876 transitions. [2021-11-23 02:56:22,912 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-23 02:56:22,912 INFO L276 IsEmpty]: Start isEmpty. Operand 1219 states and 1876 transitions. [2021-11-23 02:56:22,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 02:56:22,916 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:22,917 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:22,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:23,140 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:23,140 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:23,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:23,141 INFO L85 PathProgramCache]: Analyzing trace with hash 702210711, now seen corresponding path program 1 times [2021-11-23 02:56:23,141 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:23,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048238134] [2021-11-23 02:56:23,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:23,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:23,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:23,308 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:56:23,308 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:23,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048238134] [2021-11-23 02:56:23,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048238134] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:23,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276951567] [2021-11-23 02:56:23,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:23,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:23,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:23,310 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:23,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:56:23,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:23,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 1369 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:56:23,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:23,934 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:56:23,934 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:23,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276951567] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:23,934 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:23,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2021-11-23 02:56:23,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071406527] [2021-11-23 02:56:23,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:23,935 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:56:23,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:23,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:56:23,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:56:23,937 INFO L87 Difference]: Start difference. First operand 1219 states and 1876 transitions. Second operand has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-23 02:56:24,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:24,806 INFO L93 Difference]: Finished difference Result 2650 states and 4075 transitions. [2021-11-23 02:56:24,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:56:24,807 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) Word has length 104 [2021-11-23 02:56:24,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:24,820 INFO L225 Difference]: With dead ends: 2650 [2021-11-23 02:56:24,820 INFO L226 Difference]: Without dead ends: 1446 [2021-11-23 02:56:24,829 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:56:24,830 INFO L933 BasicCegarLoop]: 909 mSDtfsCounter, 778 mSDsluCounter, 2702 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 328 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 779 SdHoareTripleChecker+Valid, 3453 SdHoareTripleChecker+Invalid, 793 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 328 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:24,831 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [779 Valid, 3453 Invalid, 793 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [328 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:56:24,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1446 states. [2021-11-23 02:56:24,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1446 to 1427. [2021-11-23 02:56:24,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1427 states, 1005 states have (on average 1.4796019900497512) internal successors, (1487), 1048 states have internal predecessors, (1487), 318 states have call successors, (318), 108 states have call predecessors, (318), 103 states have return successors, (373), 307 states have call predecessors, (373), 311 states have call successors, (373) [2021-11-23 02:56:24,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1427 states to 1427 states and 2178 transitions. [2021-11-23 02:56:24,922 INFO L78 Accepts]: Start accepts. Automaton has 1427 states and 2178 transitions. Word has length 104 [2021-11-23 02:56:24,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:24,923 INFO L470 AbstractCegarLoop]: Abstraction has 1427 states and 2178 transitions. [2021-11-23 02:56:24,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-23 02:56:24,927 INFO L276 IsEmpty]: Start isEmpty. Operand 1427 states and 2178 transitions. [2021-11-23 02:56:24,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-23 02:56:24,931 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:24,931 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:24,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:25,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:25,156 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:25,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:25,157 INFO L85 PathProgramCache]: Analyzing trace with hash -131409821, now seen corresponding path program 1 times [2021-11-23 02:56:25,157 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:25,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027117568] [2021-11-23 02:56:25,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:25,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:25,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:25,257 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:56:25,257 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:25,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027117568] [2021-11-23 02:56:25,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027117568] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:25,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470188629] [2021-11-23 02:56:25,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:25,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:25,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:25,259 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:25,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:56:25,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:25,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 1371 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:56:25,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:25,732 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 02:56:25,733 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:25,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470188629] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:25,733 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:25,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2021-11-23 02:56:25,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025258966] [2021-11-23 02:56:25,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:25,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:56:25,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:25,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:56:25,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:56:25,735 INFO L87 Difference]: Start difference. First operand 1427 states and 2178 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-23 02:56:25,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:25,949 INFO L93 Difference]: Finished difference Result 2863 states and 4446 transitions. [2021-11-23 02:56:25,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:56:25,949 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) Word has length 104 [2021-11-23 02:56:25,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:25,963 INFO L225 Difference]: With dead ends: 2863 [2021-11-23 02:56:25,963 INFO L226 Difference]: Without dead ends: 1459 [2021-11-23 02:56:25,975 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:56:25,976 INFO L933 BasicCegarLoop]: 640 mSDtfsCounter, 2 mSDsluCounter, 2018 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2545 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:25,976 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2545 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:56:25,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1459 states. [2021-11-23 02:56:26,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1459 to 1439. [2021-11-23 02:56:26,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1439 states, 1014 states have (on average 1.47534516765286) internal successors, (1496), 1057 states have internal predecessors, (1496), 318 states have call successors, (318), 108 states have call predecessors, (318), 106 states have return successors, (376), 310 states have call predecessors, (376), 311 states have call successors, (376) [2021-11-23 02:56:26,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1439 states to 1439 states and 2190 transitions. [2021-11-23 02:56:26,070 INFO L78 Accepts]: Start accepts. Automaton has 1439 states and 2190 transitions. Word has length 104 [2021-11-23 02:56:26,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:26,070 INFO L470 AbstractCegarLoop]: Abstraction has 1439 states and 2190 transitions. [2021-11-23 02:56:26,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-23 02:56:26,071 INFO L276 IsEmpty]: Start isEmpty. Operand 1439 states and 2190 transitions. [2021-11-23 02:56:26,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 02:56:26,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:26,075 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:26,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:26,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:26,304 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:26,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:26,305 INFO L85 PathProgramCache]: Analyzing trace with hash 266196547, now seen corresponding path program 1 times [2021-11-23 02:56:26,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:26,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473459020] [2021-11-23 02:56:26,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:26,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:26,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:26,445 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:56:26,445 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:26,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473459020] [2021-11-23 02:56:26,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [473459020] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:26,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [779386980] [2021-11-23 02:56:26,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:26,446 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:26,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:26,447 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:26,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:56:26,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:26,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 1375 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:56:26,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:26,948 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 02:56:26,948 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:26,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [779386980] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:26,949 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:26,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-23 02:56:26,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612487641] [2021-11-23 02:56:26,950 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:26,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:56:26,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:26,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:56:26,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:56:26,951 INFO L87 Difference]: Start difference. First operand 1439 states and 2190 transitions. Second operand has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-23 02:56:27,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:27,299 INFO L93 Difference]: Finished difference Result 2929 states and 4525 transitions. [2021-11-23 02:56:27,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:56:27,300 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 106 [2021-11-23 02:56:27,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:27,315 INFO L225 Difference]: With dead ends: 2929 [2021-11-23 02:56:27,316 INFO L226 Difference]: Without dead ends: 1514 [2021-11-23 02:56:27,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:56:27,334 INFO L933 BasicCegarLoop]: 623 mSDtfsCounter, 19 mSDsluCounter, 1182 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 1747 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:27,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 1747 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:56:27,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1514 states. [2021-11-23 02:56:27,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1514 to 1496. [2021-11-23 02:56:27,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1496 states, 1071 states have (on average 1.4836601307189543) internal successors, (1589), 1114 states have internal predecessors, (1589), 318 states have call successors, (318), 108 states have call predecessors, (318), 106 states have return successors, (376), 310 states have call predecessors, (376), 311 states have call successors, (376) [2021-11-23 02:56:27,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1496 states to 1496 states and 2283 transitions. [2021-11-23 02:56:27,437 INFO L78 Accepts]: Start accepts. Automaton has 1496 states and 2283 transitions. Word has length 106 [2021-11-23 02:56:27,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:27,438 INFO L470 AbstractCegarLoop]: Abstraction has 1496 states and 2283 transitions. [2021-11-23 02:56:27,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-23 02:56:27,438 INFO L276 IsEmpty]: Start isEmpty. Operand 1496 states and 2283 transitions. [2021-11-23 02:56:27,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 02:56:27,443 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:27,444 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:27,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:27,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 02:56:27,660 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:27,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:27,661 INFO L85 PathProgramCache]: Analyzing trace with hash 514278873, now seen corresponding path program 1 times [2021-11-23 02:56:27,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:27,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134767391] [2021-11-23 02:56:27,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:27,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:27,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:27,798 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:56:27,798 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:27,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134767391] [2021-11-23 02:56:27,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134767391] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:27,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843309320] [2021-11-23 02:56:27,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:27,800 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:27,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:27,801 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:27,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:56:28,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:28,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 1377 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:56:28,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:28,281 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:56:28,282 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:28,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843309320] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:28,282 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:28,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2021-11-23 02:56:28,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637042240] [2021-11-23 02:56:28,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:28,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:56:28,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:28,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:56:28,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:56:28,285 INFO L87 Difference]: Start difference. First operand 1496 states and 2283 transitions. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-23 02:56:29,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:29,322 INFO L93 Difference]: Finished difference Result 3578 states and 5662 transitions. [2021-11-23 02:56:29,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:56:29,323 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 108 [2021-11-23 02:56:29,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:29,346 INFO L225 Difference]: With dead ends: 3578 [2021-11-23 02:56:29,346 INFO L226 Difference]: Without dead ends: 2519 [2021-11-23 02:56:29,359 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:56:29,360 INFO L933 BasicCegarLoop]: 801 mSDtfsCounter, 649 mSDsluCounter, 1716 mSDsCounter, 0 mSdLazyCounter, 918 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 651 SdHoareTripleChecker+Valid, 2419 SdHoareTripleChecker+Invalid, 951 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 918 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:29,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [651 Valid, 2419 Invalid, 951 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 918 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:56:29,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2519 states. [2021-11-23 02:56:29,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2519 to 2466. [2021-11-23 02:56:29,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2466 states, 1767 states have (on average 1.4770797962648556) internal successors, (2610), 1836 states have internal predecessors, (2610), 520 states have call successors, (520), 180 states have call predecessors, (520), 178 states have return successors, (737), 510 states have call predecessors, (737), 509 states have call successors, (737) [2021-11-23 02:56:29,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2466 states to 2466 states and 3867 transitions. [2021-11-23 02:56:29,547 INFO L78 Accepts]: Start accepts. Automaton has 2466 states and 3867 transitions. Word has length 108 [2021-11-23 02:56:29,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:29,548 INFO L470 AbstractCegarLoop]: Abstraction has 2466 states and 3867 transitions. [2021-11-23 02:56:29,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-23 02:56:29,549 INFO L276 IsEmpty]: Start isEmpty. Operand 2466 states and 3867 transitions. [2021-11-23 02:56:29,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 02:56:29,553 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:29,553 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:29,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:29,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-23 02:56:29,780 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:29,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:29,781 INFO L85 PathProgramCache]: Analyzing trace with hash -1751026237, now seen corresponding path program 1 times [2021-11-23 02:56:29,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:29,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225596353] [2021-11-23 02:56:29,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:29,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:29,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:29,878 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:56:29,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:29,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225596353] [2021-11-23 02:56:29,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225596353] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:29,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084252579] [2021-11-23 02:56:29,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:29,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:29,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:29,880 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:29,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:56:30,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:30,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:56:30,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:30,397 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:56:30,398 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:30,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084252579] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:30,398 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:30,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 4 [2021-11-23 02:56:30,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413422144] [2021-11-23 02:56:30,399 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:30,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:56:30,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:30,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:56:30,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:56:30,400 INFO L87 Difference]: Start difference. First operand 2466 states and 3867 transitions. Second operand has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-23 02:56:30,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:30,675 INFO L93 Difference]: Finished difference Result 4972 states and 7958 transitions. [2021-11-23 02:56:30,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:56:30,676 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 108 [2021-11-23 02:56:30,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:30,700 INFO L225 Difference]: With dead ends: 4972 [2021-11-23 02:56:30,700 INFO L226 Difference]: Without dead ends: 2530 [2021-11-23 02:56:30,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:56:30,732 INFO L933 BasicCegarLoop]: 637 mSDtfsCounter, 4 mSDsluCounter, 1308 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 1873 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:30,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 1873 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:56:30,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2530 states. [2021-11-23 02:56:30,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2530 to 2476. [2021-11-23 02:56:30,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2476 states, 1777 states have (on average 1.4642656162070906) internal successors, (2602), 1846 states have internal predecessors, (2602), 520 states have call successors, (520), 180 states have call predecessors, (520), 178 states have return successors, (737), 510 states have call predecessors, (737), 509 states have call successors, (737) [2021-11-23 02:56:30,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2476 states to 2476 states and 3859 transitions. [2021-11-23 02:56:30,965 INFO L78 Accepts]: Start accepts. Automaton has 2476 states and 3859 transitions. Word has length 108 [2021-11-23 02:56:30,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:30,968 INFO L470 AbstractCegarLoop]: Abstraction has 2476 states and 3859 transitions. [2021-11-23 02:56:30,968 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-23 02:56:30,968 INFO L276 IsEmpty]: Start isEmpty. Operand 2476 states and 3859 transitions. [2021-11-23 02:56:30,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 02:56:30,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:30,973 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:31,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:31,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:31,200 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:31,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:31,201 INFO L85 PathProgramCache]: Analyzing trace with hash -1289654524, now seen corresponding path program 1 times [2021-11-23 02:56:31,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:31,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129955043] [2021-11-23 02:56:31,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:31,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:31,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:31,322 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:56:31,322 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:31,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129955043] [2021-11-23 02:56:31,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129955043] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:31,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874115492] [2021-11-23 02:56:31,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:31,323 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:31,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:31,324 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:31,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:56:31,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:31,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 1378 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:56:31,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:31,819 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:56:31,820 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:31,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874115492] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:31,820 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:31,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2021-11-23 02:56:31,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450919487] [2021-11-23 02:56:31,821 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:31,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:56:31,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:31,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:56:31,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:56:31,823 INFO L87 Difference]: Start difference. First operand 2476 states and 3859 transitions. Second operand has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-23 02:56:32,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:32,904 INFO L93 Difference]: Finished difference Result 5527 states and 8868 transitions. [2021-11-23 02:56:32,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:56:32,905 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 109 [2021-11-23 02:56:32,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:32,936 INFO L225 Difference]: With dead ends: 5527 [2021-11-23 02:56:32,936 INFO L226 Difference]: Without dead ends: 3493 [2021-11-23 02:56:33,031 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:56:33,031 INFO L933 BasicCegarLoop]: 805 mSDtfsCounter, 664 mSDsluCounter, 1712 mSDsCounter, 0 mSdLazyCounter, 931 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 666 SdHoareTripleChecker+Valid, 2419 SdHoareTripleChecker+Invalid, 964 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 931 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:33,032 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [666 Valid, 2419 Invalid, 964 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 931 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:56:33,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3493 states. [2021-11-23 02:56:33,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3493 to 3444. [2021-11-23 02:56:33,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3444 states, 2471 states have (on average 1.462161068393363) internal successors, (3613), 2566 states have internal predecessors, (3613), 722 states have call successors, (722), 252 states have call predecessors, (722), 250 states have return successors, (1171), 710 states have call predecessors, (1171), 707 states have call successors, (1171) [2021-11-23 02:56:33,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3444 states to 3444 states and 5506 transitions. [2021-11-23 02:56:33,247 INFO L78 Accepts]: Start accepts. Automaton has 3444 states and 5506 transitions. Word has length 109 [2021-11-23 02:56:33,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:33,248 INFO L470 AbstractCegarLoop]: Abstraction has 3444 states and 5506 transitions. [2021-11-23 02:56:33,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-23 02:56:33,249 INFO L276 IsEmpty]: Start isEmpty. Operand 3444 states and 5506 transitions. [2021-11-23 02:56:33,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-23 02:56:33,254 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:33,254 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:33,292 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-23 02:56:33,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:56:33,480 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:33,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:33,481 INFO L85 PathProgramCache]: Analyzing trace with hash -282741393, now seen corresponding path program 1 times [2021-11-23 02:56:33,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:33,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539278830] [2021-11-23 02:56:33,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:33,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:33,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:33,602 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:56:33,602 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:33,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539278830] [2021-11-23 02:56:33,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539278830] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:33,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1452034450] [2021-11-23 02:56:33,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:33,604 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:33,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:33,608 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:33,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:56:33,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:33,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 1379 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:56:33,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:34,125 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:56:34,126 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:34,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1452034450] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:34,126 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:56:34,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2021-11-23 02:56:34,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201786479] [2021-11-23 02:56:34,127 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:34,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:56:34,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:34,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:56:34,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:56:34,129 INFO L87 Difference]: Start difference. First operand 3444 states and 5506 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-23 02:56:35,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:35,394 INFO L93 Difference]: Finished difference Result 7369 states and 12029 transitions. [2021-11-23 02:56:35,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:56:35,395 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 110 [2021-11-23 02:56:35,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:35,451 INFO L225 Difference]: With dead ends: 7369 [2021-11-23 02:56:35,451 INFO L226 Difference]: Without dead ends: 4370 [2021-11-23 02:56:35,485 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:56:35,487 INFO L933 BasicCegarLoop]: 809 mSDtfsCounter, 682 mSDsluCounter, 1712 mSDsCounter, 0 mSdLazyCounter, 914 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 684 SdHoareTripleChecker+Valid, 2423 SdHoareTripleChecker+Invalid, 943 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 914 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:35,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [684 Valid, 2423 Invalid, 943 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 914 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:56:35,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4370 states. [2021-11-23 02:56:35,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4370 to 4237. [2021-11-23 02:56:35,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4237 states, 3011 states have (on average 1.4613085353703088) internal successors, (4400), 3130 states have internal predecessors, (4400), 913 states have call successors, (913), 317 states have call predecessors, (913), 312 states have return successors, (1586), 898 states have call predecessors, (1586), 895 states have call successors, (1586) [2021-11-23 02:56:35,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4237 states to 4237 states and 6899 transitions. [2021-11-23 02:56:35,839 INFO L78 Accepts]: Start accepts. Automaton has 4237 states and 6899 transitions. Word has length 110 [2021-11-23 02:56:35,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:35,840 INFO L470 AbstractCegarLoop]: Abstraction has 4237 states and 6899 transitions. [2021-11-23 02:56:35,841 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-11-23 02:56:35,841 INFO L276 IsEmpty]: Start isEmpty. Operand 4237 states and 6899 transitions. [2021-11-23 02:56:35,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 02:56:35,847 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:35,847 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:35,890 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:36,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:56:36,060 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:36,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:36,061 INFO L85 PathProgramCache]: Analyzing trace with hash -678055032, now seen corresponding path program 1 times [2021-11-23 02:56:36,061 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:36,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104405806] [2021-11-23 02:56:36,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:36,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:36,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:36,176 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:56:36,176 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:36,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104405806] [2021-11-23 02:56:36,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104405806] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:36,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026383849] [2021-11-23 02:56:36,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:36,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:36,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:36,178 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:36,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:56:36,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:36,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 1377 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:56:36,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:36,746 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:56:36,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:56:37,185 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:56:37,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1026383849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:56:37,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1251694029] [2021-11-23 02:56:37,210 INFO L159 IcfgInterpreter]: Started Sifa with 91 locations of interest [2021-11-23 02:56:37,210 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:56:37,215 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:56:37,221 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:56:37,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:56:43,785 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 574 for LOIs [2021-11-23 02:56:55,618 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 449 for LOIs [2021-11-23 02:56:57,987 INFO L197 IcfgInterpreter]: Interpreting procedure isExecutiveFloorCalling with input of size 501 for LOIs [2021-11-23 02:57:00,358 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 503 for LOIs [2021-11-23 02:57:00,747 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentFloorID with input of size 501 for LOIs [2021-11-23 02:57:01,065 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 458 for LOIs [2021-11-23 02:57:02,083 INFO L197 IcfgInterpreter]: Interpreting procedure isTopFloor with input of size 453 for LOIs [2021-11-23 02:57:02,163 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 439 for LOIs [2021-11-23 02:57:02,245 INFO L197 IcfgInterpreter]: Interpreting procedure angelinaCall with input of size 542 for LOIs [2021-11-23 02:57:04,971 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 792 for LOIs [2021-11-23 02:57:09,662 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 641 for LOIs [2021-11-23 02:57:10,131 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:57:21,067 WARN L227 SmtUtils]: Spent 6.61s on a formula simplification. DAG size of input: 641 DAG size of output: 576 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:57:28,439 WARN L227 SmtUtils]: Spent 6.72s on a formula simplification. DAG size of input: 681 DAG size of output: 589 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:57:51,502 WARN L227 SmtUtils]: Spent 14.61s on a formula simplification. DAG size of input: 792 DAG size of output: 585 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:57:59,179 WARN L227 SmtUtils]: Spent 6.84s on a formula simplification that was a NOOP. DAG size: 781 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:59:02,216 WARN L227 SmtUtils]: Spent 5.01s on a formula simplification. DAG size of input: 616 DAG size of output: 589 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:59:21,046 WARN L227 SmtUtils]: Spent 5.35s on a formula simplification. DAG size of input: 622 DAG size of output: 594 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:59:26,962 WARN L227 SmtUtils]: Spent 5.31s on a formula simplification. DAG size of input: 620 DAG size of output: 593 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:59:32,730 WARN L227 SmtUtils]: Spent 5.14s on a formula simplification. DAG size of input: 626 DAG size of output: 597 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:59:38,465 WARN L227 SmtUtils]: Spent 5.10s on a formula simplification. DAG size of input: 631 DAG size of output: 599 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:59:44,209 WARN L227 SmtUtils]: Spent 5.20s on a formula simplification. DAG size of input: 630 DAG size of output: 599 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:00:15,624 WARN L227 SmtUtils]: Spent 5.39s on a formula simplification. DAG size of input: 641 DAG size of output: 609 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:00:21,673 WARN L227 SmtUtils]: Spent 5.34s on a formula simplification. DAG size of input: 641 DAG size of output: 609 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:00:50,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1251694029] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:00:50,058 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:00:50,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [5, 6, 7] total 64 [2021-11-23 03:00:50,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353740812] [2021-11-23 03:00:50,059 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:00:50,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-23 03:00:50,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:00:50,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-23 03:00:50,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=3633, Unknown=0, NotChecked=0, Total=4032 [2021-11-23 03:00:50,063 INFO L87 Difference]: Start difference. First operand 4237 states and 6899 transitions. Second operand has 52 states, 37 states have (on average 1.6756756756756757) internal successors, (62), 33 states have internal predecessors, (62), 16 states have call successors, (19), 11 states have call predecessors, (19), 11 states have return successors, (17), 15 states have call predecessors, (17), 15 states have call successors, (17) [2021-11-23 03:01:07,103 WARN L227 SmtUtils]: Spent 6.73s on a formula simplification. DAG size of input: 586 DAG size of output: 547 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:01:17,403 WARN L227 SmtUtils]: Spent 9.68s on a formula simplification. DAG size of input: 781 DAG size of output: 562 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:01:47,075 WARN L227 SmtUtils]: Spent 5.18s on a formula simplification. DAG size of input: 629 DAG size of output: 604 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:02:16,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:16,369 INFO L93 Difference]: Finished difference Result 8690 states and 14144 transitions. [2021-11-23 03:02:16,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-23 03:02:16,370 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 37 states have (on average 1.6756756756756757) internal successors, (62), 33 states have internal predecessors, (62), 16 states have call successors, (19), 11 states have call predecessors, (19), 11 states have return successors, (17), 15 states have call predecessors, (17), 15 states have call successors, (17) Word has length 111 [2021-11-23 03:02:16,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:16,412 INFO L225 Difference]: With dead ends: 8690 [2021-11-23 03:02:16,412 INFO L226 Difference]: Without dead ends: 4476 [2021-11-23 03:02:16,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 269 SyntacticMatches, 5 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1557 ImplicationChecksByTransitivity, 259.4s TimeCoverageRelationStatistics Valid=455, Invalid=4515, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 03:02:16,450 INFO L933 BasicCegarLoop]: 656 mSDtfsCounter, 541 mSDsluCounter, 6699 mSDsCounter, 0 mSdLazyCounter, 9798 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 42.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 565 SdHoareTripleChecker+Valid, 7209 SdHoareTripleChecker+Invalid, 9973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 9798 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 46.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:16,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [565 Valid, 7209 Invalid, 9973 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [175 Valid, 9798 Invalid, 0 Unknown, 0 Unchecked, 46.2s Time] [2021-11-23 03:02:16,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4476 states. [2021-11-23 03:02:16,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4476 to 4400. [2021-11-23 03:02:16,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4400 states, 3123 states have (on average 1.4534101825168109) internal successors, (4539), 3245 states have internal predecessors, (4539), 947 states have call successors, (947), 332 states have call predecessors, (947), 329 states have return successors, (1622), 931 states have call predecessors, (1622), 929 states have call successors, (1622) [2021-11-23 03:02:16,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4400 states to 4400 states and 7108 transitions. [2021-11-23 03:02:16,909 INFO L78 Accepts]: Start accepts. Automaton has 4400 states and 7108 transitions. Word has length 111 [2021-11-23 03:02:16,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:16,909 INFO L470 AbstractCegarLoop]: Abstraction has 4400 states and 7108 transitions. [2021-11-23 03:02:16,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 37 states have (on average 1.6756756756756757) internal successors, (62), 33 states have internal predecessors, (62), 16 states have call successors, (19), 11 states have call predecessors, (19), 11 states have return successors, (17), 15 states have call predecessors, (17), 15 states have call successors, (17) [2021-11-23 03:02:16,910 INFO L276 IsEmpty]: Start isEmpty. Operand 4400 states and 7108 transitions. [2021-11-23 03:02:16,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 03:02:16,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:16,918 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:16,958 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:02:17,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 03:02:17,143 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:17,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:17,144 INFO L85 PathProgramCache]: Analyzing trace with hash -909317730, now seen corresponding path program 1 times [2021-11-23 03:02:17,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:17,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684791824] [2021-11-23 03:02:17,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:17,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:17,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:17,383 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 03:02:17,383 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:17,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684791824] [2021-11-23 03:02:17,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684791824] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:17,384 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:02:17,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 03:02:17,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179508695] [2021-11-23 03:02:17,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:17,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:02:17,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:17,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:02:17,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:02:17,389 INFO L87 Difference]: Start difference. First operand 4400 states and 7108 transitions. Second operand has 8 states, 8 states have (on average 8.5) internal successors, (68), 8 states have internal predecessors, (68), 5 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 5 states have call predecessors, (17), 5 states have call successors, (17) [2021-11-23 03:02:18,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:18,318 INFO L93 Difference]: Finished difference Result 8495 states and 13833 transitions. [2021-11-23 03:02:18,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 03:02:18,319 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.5) internal successors, (68), 8 states have internal predecessors, (68), 5 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 5 states have call predecessors, (17), 5 states have call successors, (17) Word has length 116 [2021-11-23 03:02:18,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:18,363 INFO L225 Difference]: With dead ends: 8495 [2021-11-23 03:02:18,364 INFO L226 Difference]: Without dead ends: 4479 [2021-11-23 03:02:18,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:02:18,400 INFO L933 BasicCegarLoop]: 900 mSDtfsCounter, 852 mSDsluCounter, 5073 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 862 SdHoareTripleChecker+Valid, 5728 SdHoareTripleChecker+Invalid, 535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:18,400 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [862 Valid, 5728 Invalid, 535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:02:18,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4479 states. [2021-11-23 03:02:18,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4479 to 4424. [2021-11-23 03:02:18,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4424 states, 3139 states have (on average 1.4510990761388978) internal successors, (4555), 3263 states have internal predecessors, (4555), 947 states have call successors, (947), 332 states have call predecessors, (947), 337 states have return successors, (1639), 937 states have call predecessors, (1639), 929 states have call successors, (1639) [2021-11-23 03:02:18,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4424 states to 4424 states and 7141 transitions. [2021-11-23 03:02:18,867 INFO L78 Accepts]: Start accepts. Automaton has 4424 states and 7141 transitions. Word has length 116 [2021-11-23 03:02:18,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:18,868 INFO L470 AbstractCegarLoop]: Abstraction has 4424 states and 7141 transitions. [2021-11-23 03:02:18,869 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 8.5) internal successors, (68), 8 states have internal predecessors, (68), 5 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 5 states have call predecessors, (17), 5 states have call successors, (17) [2021-11-23 03:02:18,869 INFO L276 IsEmpty]: Start isEmpty. Operand 4424 states and 7141 transitions. [2021-11-23 03:02:18,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-23 03:02:18,878 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:18,879 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:18,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 03:02:18,879 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:18,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:18,880 INFO L85 PathProgramCache]: Analyzing trace with hash 623978552, now seen corresponding path program 1 times [2021-11-23 03:02:18,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:18,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225920382] [2021-11-23 03:02:18,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:18,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:18,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:19,025 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:02:19,026 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:19,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225920382] [2021-11-23 03:02:19,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225920382] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:02:19,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659159929] [2021-11-23 03:02:19,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:19,027 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:19,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:02:19,028 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:02:19,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:02:19,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:19,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 1401 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:02:19,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:02:19,659 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 03:02:19,659 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:02:19,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659159929] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:02:19,660 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:02:19,660 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5] total 10 [2021-11-23 03:02:19,660 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428280311] [2021-11-23 03:02:19,660 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:02:19,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:02:19,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:02:19,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:02:19,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:02:19,661 INFO L87 Difference]: Start difference. First operand 4424 states and 7141 transitions. Second operand has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 6 states have internal predecessors, (71), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 03:02:20,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:02:20,502 INFO L93 Difference]: Finished difference Result 9460 states and 16173 transitions. [2021-11-23 03:02:20,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:02:20,503 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 6 states have internal predecessors, (71), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) Word has length 118 [2021-11-23 03:02:20,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:02:20,554 INFO L225 Difference]: With dead ends: 9460 [2021-11-23 03:02:20,554 INFO L226 Difference]: Without dead ends: 5445 [2021-11-23 03:02:20,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:02:20,594 INFO L933 BasicCegarLoop]: 754 mSDtfsCounter, 169 mSDsluCounter, 3751 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 4321 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:02:20,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 4321 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:02:20,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5445 states. [2021-11-23 03:02:21,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5445 to 5012. [2021-11-23 03:02:21,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5012 states, 3466 states have (on average 1.4460473167916907) internal successors, (5012), 3657 states have internal predecessors, (5012), 1189 states have call successors, (1189), 332 states have call predecessors, (1189), 356 states have return successors, (2062), 1191 states have call predecessors, (2062), 1171 states have call successors, (2062) [2021-11-23 03:02:21,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5012 states to 5012 states and 8263 transitions. [2021-11-23 03:02:21,113 INFO L78 Accepts]: Start accepts. Automaton has 5012 states and 8263 transitions. Word has length 118 [2021-11-23 03:02:21,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:02:21,114 INFO L470 AbstractCegarLoop]: Abstraction has 5012 states and 8263 transitions. [2021-11-23 03:02:21,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 6 states have internal predecessors, (71), 2 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-23 03:02:21,115 INFO L276 IsEmpty]: Start isEmpty. Operand 5012 states and 8263 transitions. [2021-11-23 03:02:21,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-23 03:02:21,123 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:02:21,123 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:02:21,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:02:21,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:21,340 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:02:21,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:02:21,341 INFO L85 PathProgramCache]: Analyzing trace with hash -1867839981, now seen corresponding path program 1 times [2021-11-23 03:02:21,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:02:21,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716255570] [2021-11-23 03:02:21,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:21,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:02:21,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:21,480 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 03:02:21,481 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:02:21,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716255570] [2021-11-23 03:02:21,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716255570] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:02:21,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44648405] [2021-11-23 03:02:21,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:02:21,482 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:02:21,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:02:21,496 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:02:21,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d4915ff1-2bfb-44b8-b803-347dfb025f25/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:02:21,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:02:21,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 1407 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:02:21,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:02:22,128 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:02:22,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:02:22,524 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 03:02:22,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44648405] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:02:22,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [805034285] [2021-11-23 03:02:22,537 INFO L159 IcfgInterpreter]: Started Sifa with 100 locations of interest [2021-11-23 03:02:22,537 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:02:22,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:02:22,540 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:02:22,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:02:27,708 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 574 for LOIs [2021-11-23 03:03:14,747 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 494 for LOIs [2021-11-23 03:03:17,081 INFO L197 IcfgInterpreter]: Interpreting procedure isExecutiveFloorCalling with input of size 499 for LOIs [2021-11-23 03:03:19,215 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 501 for LOIs [2021-11-23 03:03:19,568 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 100 for LOIs [2021-11-23 03:03:19,918 INFO L197 IcfgInterpreter]: Interpreting procedure isTopFloor with input of size 95 for LOIs [2021-11-23 03:03:19,936 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 439 for LOIs [2021-11-23 03:03:20,029 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull with input of size 441 for LOIs [2021-11-23 03:03:20,209 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentFloorID with input of size 441 for LOIs [2021-11-23 03:03:20,283 INFO L197 IcfgInterpreter]: Interpreting procedure angelinaCall with input of size 542 for LOIs [2021-11-23 03:03:23,027 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 792 for LOIs [2021-11-23 03:03:27,550 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 641 for LOIs [2021-11-23 03:03:28,024 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:03:39,642 WARN L227 SmtUtils]: Spent 6.93s on a formula simplification. DAG size of input: 641 DAG size of output: 576 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:03:47,741 WARN L227 SmtUtils]: Spent 7.37s on a formula simplification. DAG size of input: 681 DAG size of output: 589 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:04:12,509 WARN L227 SmtUtils]: Spent 15.62s on a formula simplification. DAG size of input: 792 DAG size of output: 585 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:04:20,628 WARN L227 SmtUtils]: Spent 7.29s on a formula simplification that was a NOOP. DAG size: 781 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:04:52,448 WARN L227 SmtUtils]: Spent 5.53s on a formula simplification. DAG size of input: 614 DAG size of output: 586 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:04:58,316 WARN L227 SmtUtils]: Spent 5.38s on a formula simplification. DAG size of input: 608 DAG size of output: 583 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:05:04,636 WARN L227 SmtUtils]: Spent 5.11s on a formula simplification. DAG size of input: 499 DAG size of output: 470 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:05:11,316 WARN L227 SmtUtils]: Spent 5.43s on a formula simplification. DAG size of input: 501 DAG size of output: 472 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:05:18,163 WARN L227 SmtUtils]: Spent 5.41s on a formula simplification. DAG size of input: 541 DAG size of output: 480 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:05:24,435 WARN L227 SmtUtils]: Spent 5.05s on a formula simplification. DAG size of input: 616 DAG size of output: 589 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:05:30,221 WARN L227 SmtUtils]: Spent 5.24s on a formula simplification. DAG size of input: 616 DAG size of output: 589 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:05:36,009 WARN L227 SmtUtils]: Spent 5.28s on a formula simplification. DAG size of input: 612 DAG size of output: 585 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:05:59,874 WARN L227 SmtUtils]: Spent 8.62s on a formula simplification. DAG size of input: 689 DAG size of output: 598 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:06:10,679 WARN L227 SmtUtils]: Spent 8.35s on a formula simplification. DAG size of input: 694 DAG size of output: 601 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:06:21,114 WARN L227 SmtUtils]: Spent 7.88s on a formula simplification. DAG size of input: 699 DAG size of output: 603 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:06:30,256 WARN L227 SmtUtils]: Spent 8.19s on a formula simplification. DAG size of input: 709 DAG size of output: 601 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:07:08,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [805034285] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:07:08,577 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:07:08,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [5, 6, 7] total 67 [2021-11-23 03:07:08,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756841684] [2021-11-23 03:07:08,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:07:08,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 03:07:08,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:08,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 03:07:08,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=423, Invalid=3999, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 03:07:08,582 INFO L87 Difference]: Start difference. First operand 5012 states and 8263 transitions. Second operand has 55 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 34 states have internal predecessors, (67), 16 states have call successors, (21), 13 states have call predecessors, (21), 11 states have return successors, (19), 15 states have call predecessors, (19), 15 states have call successors, (19) [2021-11-23 03:07:24,954 WARN L227 SmtUtils]: Spent 6.79s on a formula simplification. DAG size of input: 586 DAG size of output: 547 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:07:34,344 WARN L227 SmtUtils]: Spent 8.80s on a formula simplification. DAG size of input: 781 DAG size of output: 562 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)