./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec2_product03.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec2_product03.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 859441835e916fdbcdc78c3c849990624cc8f637b8bbdd3bb312aaefa9b36e0f --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:35:21,419 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:35:21,422 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:35:21,471 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:35:21,472 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:35:21,473 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:35:21,475 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:35:21,478 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:35:21,480 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:35:21,482 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:35:21,483 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:35:21,485 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:35:21,485 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:35:21,487 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:35:21,489 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:35:21,491 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:35:21,492 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:35:21,493 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:35:21,497 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:35:21,503 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:35:21,508 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:35:21,510 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:35:21,515 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:35:21,516 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:35:21,523 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:35:21,523 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:35:21,524 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:35:21,532 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:35:21,533 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:35:21,535 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:35:21,535 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:35:21,537 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:35:21,539 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:35:21,541 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:35:21,543 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:35:21,543 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:35:21,544 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:35:21,544 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:35:21,545 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:35:21,546 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:35:21,547 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:35:21,548 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:35:21,590 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:35:21,591 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:35:21,591 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:35:21,592 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:35:21,593 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:35:21,593 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:35:21,593 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:35:21,594 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:35:21,594 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:35:21,594 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:35:21,595 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:35:21,595 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:35:21,596 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:35:21,596 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:35:21,596 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:35:21,596 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:35:21,597 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:35:21,597 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:35:21,598 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:35:21,598 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:35:21,598 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:35:21,599 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:35:21,599 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:35:21,599 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:35:21,599 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:35:21,600 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:35:21,601 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:35:21,602 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:35:21,602 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:35:21,602 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:35:21,602 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:35:21,603 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:35:21,603 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:35:21,603 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:35:21,604 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:35:21,604 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:35:21,604 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:35:21,604 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:35:21,605 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:35:21,605 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:35:21,605 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:35:21,605 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_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 859441835e916fdbcdc78c3c849990624cc8f637b8bbdd3bb312aaefa9b36e0f [2021-11-25 19:35:21,994 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:35:22,017 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:35:22,020 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:35:22,021 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:35:22,022 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:35:22,031 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/product-lines/elevator_spec2_product03.cil.c [2021-11-25 19:35:22,104 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/data/1005ffdcd/3b6833729a1a4a38bcfe0a5a8f36811e/FLAG8f4360bbf [2021-11-25 19:35:22,766 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:35:22,767 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/sv-benchmarks/c/product-lines/elevator_spec2_product03.cil.c [2021-11-25 19:35:22,806 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/data/1005ffdcd/3b6833729a1a4a38bcfe0a5a8f36811e/FLAG8f4360bbf [2021-11-25 19:35:22,968 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/data/1005ffdcd/3b6833729a1a4a38bcfe0a5a8f36811e [2021-11-25 19:35:22,971 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:35:22,973 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:35:22,975 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:35:22,975 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:35:22,993 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:35:22,994 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:35:22" (1/1) ... [2021-11-25 19:35:22,995 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@77fdaf95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:22, skipping insertion in model container [2021-11-25 19:35:22,995 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:35:22" (1/1) ... [2021-11-25 19:35:23,009 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:35:23,118 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:35:23,644 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_e4e0455b-ad82-476b-9751-378d8761a7cf/sv-benchmarks/c/product-lines/elevator_spec2_product03.cil.c[29828,29841] [2021-11-25 19:35:23,866 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:35:23,877 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:35:23,969 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_e4e0455b-ad82-476b-9751-378d8761a7cf/sv-benchmarks/c/product-lines/elevator_spec2_product03.cil.c[29828,29841] [2021-11-25 19:35:24,027 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:35:24,056 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:35:24,056 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24 WrapperNode [2021-11-25 19:35:24,057 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:35:24,058 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:35:24,058 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:35:24,058 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:35:24,066 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24" (1/1) ... [2021-11-25 19:35:24,126 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24" (1/1) ... [2021-11-25 19:35:24,180 INFO L137 Inliner]: procedures = 92, calls = 336, calls flagged for inlining = 23, calls inlined = 20, statements flattened = 1071 [2021-11-25 19:35:24,180 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:35:24,181 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:35:24,182 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:35:24,182 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:35:24,191 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24" (1/1) ... [2021-11-25 19:35:24,192 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24" (1/1) ... [2021-11-25 19:35:24,198 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24" (1/1) ... [2021-11-25 19:35:24,198 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24" (1/1) ... [2021-11-25 19:35:24,224 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24" (1/1) ... [2021-11-25 19:35:24,243 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24" (1/1) ... [2021-11-25 19:35:24,249 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24" (1/1) ... [2021-11-25 19:35:24,258 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:35:24,259 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:35:24,260 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:35:24,260 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:35:24,261 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24" (1/1) ... [2021-11-25 19:35:24,269 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:35:24,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:24,323 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:35:24,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:35:24,373 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:35:24,373 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2021-11-25 19:35:24,373 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2021-11-25 19:35:24,374 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-25 19:35:24,374 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-25 19:35:24,374 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2021-11-25 19:35:24,374 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2021-11-25 19:35:24,374 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-25 19:35:24,375 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-25 19:35:24,375 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-25 19:35:24,375 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-25 19:35:24,375 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-25 19:35:24,375 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-25 19:35:24,376 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-25 19:35:24,376 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-25 19:35:24,376 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2021-11-25 19:35:24,376 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2021-11-25 19:35:24,376 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-25 19:35:24,376 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-25 19:35:24,377 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-25 19:35:24,377 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-25 19:35:24,377 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-25 19:35:24,377 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-25 19:35:24,377 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-25 19:35:24,378 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-25 19:35:24,378 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-25 19:35:24,378 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-25 19:35:24,378 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-25 19:35:24,378 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-25 19:35:24,379 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-25 19:35:24,379 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-25 19:35:24,379 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-25 19:35:24,379 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-25 19:35:24,379 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-25 19:35:24,380 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-25 19:35:24,380 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-25 19:35:24,380 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-25 19:35:24,380 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__base [2021-11-25 19:35:24,380 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__base [2021-11-25 19:35:24,381 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:35:24,381 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-25 19:35:24,381 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-25 19:35:24,381 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-25 19:35:24,381 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-25 19:35:24,382 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-25 19:35:24,382 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-25 19:35:24,382 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:35:24,382 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:35:24,382 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-25 19:35:24,383 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-25 19:35:24,576 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:35:24,578 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:35:25,538 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:35:26,173 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:35:26,174 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 19:35:26,178 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:35:26 BoogieIcfgContainer [2021-11-25 19:35:26,178 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:35:26,181 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:35:26,181 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:35:26,184 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:35:26,185 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:35:22" (1/3) ... [2021-11-25 19:35:26,186 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ade8df6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:35:26, skipping insertion in model container [2021-11-25 19:35:26,186 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:24" (2/3) ... [2021-11-25 19:35:26,186 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ade8df6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:35:26, skipping insertion in model container [2021-11-25 19:35:26,187 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:35:26" (3/3) ... [2021-11-25 19:35:26,188 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec2_product03.cil.c [2021-11-25 19:35:26,197 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:35:26,198 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:35:26,262 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:35:26,271 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:35:26,272 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:35:26,315 INFO L276 IsEmpty]: Start isEmpty. Operand has 368 states, 249 states have (on average 1.6024096385542168) internal successors, (399), 270 states have internal predecessors, (399), 94 states have call successors, (94), 23 states have call predecessors, (94), 23 states have return successors, (94), 88 states have call predecessors, (94), 94 states have call successors, (94) [2021-11-25 19:35:26,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-25 19:35:26,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:26,349 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:26,349 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:26,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:26,355 INFO L85 PathProgramCache]: Analyzing trace with hash -22457928, now seen corresponding path program 1 times [2021-11-25 19:35:26,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:26,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541810470] [2021-11-25 19:35:26,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:26,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:26,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:26,884 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:35:26,885 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:26,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541810470] [2021-11-25 19:35:26,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541810470] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:26,887 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:26,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:35:26,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772600048] [2021-11-25 19:35:26,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:26,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 19:35:26,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:26,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 19:35:26,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:35:26,929 INFO L87 Difference]: Start difference. First operand has 368 states, 249 states have (on average 1.6024096385542168) internal successors, (399), 270 states have internal predecessors, (399), 94 states have call successors, (94), 23 states have call predecessors, (94), 23 states have return successors, (94), 88 states have call predecessors, (94), 94 states have call successors, (94) Second operand has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 2 states have call predecessors, (12), 1 states have call successors, (12) [2021-11-25 19:35:27,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:27,109 INFO L93 Difference]: Finished difference Result 386 states and 614 transitions. [2021-11-25 19:35:27,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 19:35:27,116 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 2 states have call predecessors, (12), 1 states have call successors, (12) Word has length 76 [2021-11-25 19:35:27,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:27,147 INFO L225 Difference]: With dead ends: 386 [2021-11-25 19:35:27,148 INFO L226 Difference]: Without dead ends: 364 [2021-11-25 19:35:27,153 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:35:27,159 INFO L933 BasicCegarLoop]: 547 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 547 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:27,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 547 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:27,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2021-11-25 19:35:27,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 364. [2021-11-25 19:35:27,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 247 states have (on average 1.591093117408907) internal successors, (393), 266 states have internal predecessors, (393), 94 states have call successors, (94), 23 states have call predecessors, (94), 22 states have return successors, (89), 87 states have call predecessors, (89), 89 states have call successors, (89) [2021-11-25 19:35:27,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 576 transitions. [2021-11-25 19:35:27,264 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 576 transitions. Word has length 76 [2021-11-25 19:35:27,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:27,266 INFO L470 AbstractCegarLoop]: Abstraction has 364 states and 576 transitions. [2021-11-25 19:35:27,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 2 states have call predecessors, (12), 1 states have call successors, (12) [2021-11-25 19:35:27,267 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 576 transitions. [2021-11-25 19:35:27,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-25 19:35:27,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:27,274 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:27,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:35:27,275 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:27,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:27,276 INFO L85 PathProgramCache]: Analyzing trace with hash 1412848271, now seen corresponding path program 1 times [2021-11-25 19:35:27,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:27,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [580487215] [2021-11-25 19:35:27,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:27,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:27,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:27,600 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:35:27,601 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:27,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [580487215] [2021-11-25 19:35:27,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [580487215] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:27,602 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:27,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 19:35:27,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468747883] [2021-11-25 19:35:27,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:27,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:35:27,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:27,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:35:27,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:35:27,606 INFO L87 Difference]: Start difference. First operand 364 states and 576 transitions. Second operand has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 6 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-25 19:35:30,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:30,417 INFO L93 Difference]: Finished difference Result 1248 states and 2004 transitions. [2021-11-25 19:35:30,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 19:35:30,418 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 6 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) Word has length 77 [2021-11-25 19:35:30,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:30,433 INFO L225 Difference]: With dead ends: 1248 [2021-11-25 19:35:30,434 INFO L226 Difference]: Without dead ends: 900 [2021-11-25 19:35:30,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:35:30,451 INFO L933 BasicCegarLoop]: 767 mSDtfsCounter, 1945 mSDsluCounter, 1989 mSDsCounter, 0 mSdLazyCounter, 2453 mSolverCounterSat, 581 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2011 SdHoareTripleChecker+Valid, 2651 SdHoareTripleChecker+Invalid, 3034 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 581 IncrementalHoareTripleChecker+Valid, 2453 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:30,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2011 Valid, 2651 Invalid, 3034 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [581 Valid, 2453 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-25 19:35:30,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2021-11-25 19:35:30,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 842. [2021-11-25 19:35:30,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 842 states, 591 states have (on average 1.6125211505922166) internal successors, (953), 626 states have internal predecessors, (953), 201 states have call successors, (201), 47 states have call predecessors, (201), 49 states have return successors, (202), 193 states have call predecessors, (202), 196 states have call successors, (202) [2021-11-25 19:35:30,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 842 states to 842 states and 1356 transitions. [2021-11-25 19:35:30,591 INFO L78 Accepts]: Start accepts. Automaton has 842 states and 1356 transitions. Word has length 77 [2021-11-25 19:35:30,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:30,592 INFO L470 AbstractCegarLoop]: Abstraction has 842 states and 1356 transitions. [2021-11-25 19:35:30,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 6 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-25 19:35:30,593 INFO L276 IsEmpty]: Start isEmpty. Operand 842 states and 1356 transitions. [2021-11-25 19:35:30,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-25 19:35:30,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:30,597 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:30,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:35:30,602 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:30,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:30,603 INFO L85 PathProgramCache]: Analyzing trace with hash 2043519656, now seen corresponding path program 1 times [2021-11-25 19:35:30,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:30,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026223531] [2021-11-25 19:35:30,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:30,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:30,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:30,813 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:35:30,813 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:30,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026223531] [2021-11-25 19:35:30,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026223531] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:30,814 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:30,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 19:35:30,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263117374] [2021-11-25 19:35:30,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:30,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:35:30,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:30,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:35:30,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:35:30,816 INFO L87 Difference]: Start difference. First operand 842 states and 1356 transitions. Second operand has 7 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 5 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-25 19:35:32,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:32,856 INFO L93 Difference]: Finished difference Result 1469 states and 2367 transitions. [2021-11-25 19:35:32,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:35:32,857 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 5 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) Word has length 78 [2021-11-25 19:35:32,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:32,870 INFO L225 Difference]: With dead ends: 1469 [2021-11-25 19:35:32,870 INFO L226 Difference]: Without dead ends: 967 [2021-11-25 19:35:32,873 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:35:32,882 INFO L933 BasicCegarLoop]: 605 mSDtfsCounter, 1119 mSDsluCounter, 1349 mSDsCounter, 0 mSdLazyCounter, 2172 mSolverCounterSat, 432 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1194 SdHoareTripleChecker+Valid, 1879 SdHoareTripleChecker+Invalid, 2604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 432 IncrementalHoareTripleChecker+Valid, 2172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:32,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1194 Valid, 1879 Invalid, 2604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [432 Valid, 2172 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-25 19:35:32,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 967 states. [2021-11-25 19:35:32,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 967 to 858. [2021-11-25 19:35:32,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 858 states, 601 states have (on average 1.605657237936772) internal successors, (965), 639 states have internal predecessors, (965), 203 states have call successors, (203), 50 states have call predecessors, (203), 53 states have return successors, (210), 193 states have call predecessors, (210), 198 states have call successors, (210) [2021-11-25 19:35:32,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 858 states to 858 states and 1378 transitions. [2021-11-25 19:35:32,980 INFO L78 Accepts]: Start accepts. Automaton has 858 states and 1378 transitions. Word has length 78 [2021-11-25 19:35:32,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:32,981 INFO L470 AbstractCegarLoop]: Abstraction has 858 states and 1378 transitions. [2021-11-25 19:35:32,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 5 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-25 19:35:32,981 INFO L276 IsEmpty]: Start isEmpty. Operand 858 states and 1378 transitions. [2021-11-25 19:35:32,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 19:35:32,987 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:32,987 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-25 19:35:32,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 19:35:32,988 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:32,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:32,989 INFO L85 PathProgramCache]: Analyzing trace with hash -623604157, now seen corresponding path program 1 times [2021-11-25 19:35:32,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:32,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821667543] [2021-11-25 19:35:32,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:32,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:33,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:33,176 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:35:33,177 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:33,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821667543] [2021-11-25 19:35:33,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821667543] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:33,178 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:33,178 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:35:33,178 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648864293] [2021-11-25 19:35:33,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:33,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:33,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:33,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:33,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:33,182 INFO L87 Difference]: Start difference. First operand 858 states and 1378 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:34,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:34,418 INFO L93 Difference]: Finished difference Result 2737 states and 4461 transitions. [2021-11-25 19:35:34,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:35:34,419 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 82 [2021-11-25 19:35:34,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:34,439 INFO L225 Difference]: With dead ends: 2737 [2021-11-25 19:35:34,439 INFO L226 Difference]: Without dead ends: 1895 [2021-11-25 19:35:34,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:34,451 INFO L933 BasicCegarLoop]: 552 mSDtfsCounter, 1140 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 688 mSolverCounterSat, 379 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1210 SdHoareTripleChecker+Valid, 943 SdHoareTripleChecker+Invalid, 1067 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 379 IncrementalHoareTripleChecker+Valid, 688 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:34,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1210 Valid, 943 Invalid, 1067 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [379 Valid, 688 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:35:34,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1895 states. [2021-11-25 19:35:34,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1895 to 1729. [2021-11-25 19:35:34,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1729 states, 1233 states have (on average 1.6131386861313868) internal successors, (1989), 1306 states have internal predecessors, (1989), 393 states have call successors, (393), 91 states have call predecessors, (393), 102 states have return successors, (423), 367 states have call predecessors, (423), 388 states have call successors, (423) [2021-11-25 19:35:34,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1729 states to 1729 states and 2805 transitions. [2021-11-25 19:35:34,599 INFO L78 Accepts]: Start accepts. Automaton has 1729 states and 2805 transitions. Word has length 82 [2021-11-25 19:35:34,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:34,602 INFO L470 AbstractCegarLoop]: Abstraction has 1729 states and 2805 transitions. [2021-11-25 19:35:34,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:34,609 INFO L276 IsEmpty]: Start isEmpty. Operand 1729 states and 2805 transitions. [2021-11-25 19:35:34,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-25 19:35:34,613 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:34,613 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-25 19:35:34,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 19:35:34,613 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:34,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:34,616 INFO L85 PathProgramCache]: Analyzing trace with hash 2142972868, now seen corresponding path program 1 times [2021-11-25 19:35:34,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:34,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78182745] [2021-11-25 19:35:34,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:34,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:34,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:34,782 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:35:34,782 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:34,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78182745] [2021-11-25 19:35:34,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78182745] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:34,783 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:34,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:35:34,784 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221022512] [2021-11-25 19:35:34,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:34,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:34,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:34,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:34,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:34,785 INFO L87 Difference]: Start difference. First operand 1729 states and 2805 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:36,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:36,115 INFO L93 Difference]: Finished difference Result 5284 states and 8689 transitions. [2021-11-25 19:35:36,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:35:36,115 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 83 [2021-11-25 19:35:36,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:36,150 INFO L225 Difference]: With dead ends: 5284 [2021-11-25 19:35:36,151 INFO L226 Difference]: Without dead ends: 3572 [2021-11-25 19:35:36,163 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:36,164 INFO L933 BasicCegarLoop]: 559 mSDtfsCounter, 1131 mSDsluCounter, 412 mSDsCounter, 0 mSdLazyCounter, 686 mSolverCounterSat, 378 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1200 SdHoareTripleChecker+Valid, 947 SdHoareTripleChecker+Invalid, 1064 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 378 IncrementalHoareTripleChecker+Valid, 686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:36,164 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1200 Valid, 947 Invalid, 1064 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [378 Valid, 686 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 19:35:36,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3572 states. [2021-11-25 19:35:36,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3572 to 3359. [2021-11-25 19:35:36,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3359 states, 2419 states have (on average 1.6188507647788342) internal successors, (3916), 2569 states have internal predecessors, (3916), 736 states have call successors, (736), 173 states have call predecessors, (736), 203 states have return successors, (838), 678 states have call predecessors, (838), 731 states have call successors, (838) [2021-11-25 19:35:36,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3359 states to 3359 states and 5490 transitions. [2021-11-25 19:35:36,466 INFO L78 Accepts]: Start accepts. Automaton has 3359 states and 5490 transitions. Word has length 83 [2021-11-25 19:35:36,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:36,467 INFO L470 AbstractCegarLoop]: Abstraction has 3359 states and 5490 transitions. [2021-11-25 19:35:36,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:36,468 INFO L276 IsEmpty]: Start isEmpty. Operand 3359 states and 5490 transitions. [2021-11-25 19:35:36,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-25 19:35:36,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:36,471 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-25 19:35:36,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 19:35:36,471 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:36,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:36,472 INFO L85 PathProgramCache]: Analyzing trace with hash 2007518629, now seen corresponding path program 1 times [2021-11-25 19:35:36,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:36,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255411401] [2021-11-25 19:35:36,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:36,473 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:36,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:36,566 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:35:36,566 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:36,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255411401] [2021-11-25 19:35:36,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255411401] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:36,567 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:36,567 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:35:36,567 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775536979] [2021-11-25 19:35:36,567 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:36,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:36,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:36,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:36,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:36,569 INFO L87 Difference]: Start difference. First operand 3359 states and 5490 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:37,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:37,932 INFO L93 Difference]: Finished difference Result 10220 states and 17021 transitions. [2021-11-25 19:35:37,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:35:37,934 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 84 [2021-11-25 19:35:37,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:38,000 INFO L225 Difference]: With dead ends: 10220 [2021-11-25 19:35:38,000 INFO L226 Difference]: Without dead ends: 6880 [2021-11-25 19:35:38,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:38,024 INFO L933 BasicCegarLoop]: 575 mSDtfsCounter, 1114 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 378 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1182 SdHoareTripleChecker+Valid, 960 SdHoareTripleChecker+Invalid, 1061 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 378 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:38,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1182 Valid, 960 Invalid, 1061 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [378 Valid, 683 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 19:35:38,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6880 states. [2021-11-25 19:35:38,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6880 to 6564. [2021-11-25 19:35:38,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6564 states, 4746 states have (on average 1.619047619047619) internal successors, (7684), 5056 states have internal predecessors, (7684), 1406 states have call successors, (1406), 337 states have call predecessors, (1406), 411 states have return successors, (1744), 1284 states have call predecessors, (1744), 1401 states have call successors, (1744) [2021-11-25 19:35:38,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6564 states to 6564 states and 10834 transitions. [2021-11-25 19:35:38,582 INFO L78 Accepts]: Start accepts. Automaton has 6564 states and 10834 transitions. Word has length 84 [2021-11-25 19:35:38,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:38,584 INFO L470 AbstractCegarLoop]: Abstraction has 6564 states and 10834 transitions. [2021-11-25 19:35:38,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:38,585 INFO L276 IsEmpty]: Start isEmpty. Operand 6564 states and 10834 transitions. [2021-11-25 19:35:38,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-25 19:35:38,588 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:38,588 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-25 19:35:38,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 19:35:38,589 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:38,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:38,589 INFO L85 PathProgramCache]: Analyzing trace with hash 2103408422, now seen corresponding path program 1 times [2021-11-25 19:35:38,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:38,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656576775] [2021-11-25 19:35:38,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:38,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:38,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:38,726 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:35:38,726 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:38,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656576775] [2021-11-25 19:35:38,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656576775] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:38,727 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:38,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:35:38,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092895627] [2021-11-25 19:35:38,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:38,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:38,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:38,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:38,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:38,730 INFO L87 Difference]: Start difference. First operand 6564 states and 10834 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:40,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:40,595 INFO L93 Difference]: Finished difference Result 19945 states and 33972 transitions. [2021-11-25 19:35:40,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:35:40,597 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 85 [2021-11-25 19:35:40,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:40,726 INFO L225 Difference]: With dead ends: 19945 [2021-11-25 19:35:40,727 INFO L226 Difference]: Without dead ends: 13404 [2021-11-25 19:35:40,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:40,775 INFO L933 BasicCegarLoop]: 587 mSDtfsCounter, 1101 mSDsluCounter, 408 mSDsCounter, 0 mSdLazyCounter, 680 mSolverCounterSat, 377 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1168 SdHoareTripleChecker+Valid, 972 SdHoareTripleChecker+Invalid, 1057 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 377 IncrementalHoareTripleChecker+Valid, 680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:40,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1168 Valid, 972 Invalid, 1057 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [377 Valid, 680 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 19:35:40,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13404 states. [2021-11-25 19:35:41,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13404 to 12873. [2021-11-25 19:35:41,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12873 states, 9317 states have (on average 1.616400128796823) internal successors, (15060), 9959 states have internal predecessors, (15060), 2716 states have call successors, (2716), 665 states have call predecessors, (2716), 839 states have return successors, (3854), 2466 states have call predecessors, (3854), 2711 states have call successors, (3854) [2021-11-25 19:35:41,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12873 states to 12873 states and 21630 transitions. [2021-11-25 19:35:41,936 INFO L78 Accepts]: Start accepts. Automaton has 12873 states and 21630 transitions. Word has length 85 [2021-11-25 19:35:41,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:41,937 INFO L470 AbstractCegarLoop]: Abstraction has 12873 states and 21630 transitions. [2021-11-25 19:35:41,938 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:41,939 INFO L276 IsEmpty]: Start isEmpty. Operand 12873 states and 21630 transitions. [2021-11-25 19:35:41,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-25 19:35:41,942 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:41,942 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-25 19:35:41,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 19:35:41,943 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:41,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:41,944 INFO L85 PathProgramCache]: Analyzing trace with hash 781028615, now seen corresponding path program 1 times [2021-11-25 19:35:41,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:41,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374447207] [2021-11-25 19:35:41,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:41,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:42,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:42,095 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:35:42,096 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:42,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374447207] [2021-11-25 19:35:42,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [374447207] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:42,096 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:42,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:35:42,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316194064] [2021-11-25 19:35:42,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:42,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:42,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:42,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:42,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:42,099 INFO L87 Difference]: Start difference. First operand 12873 states and 21630 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:44,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:44,647 INFO L93 Difference]: Finished difference Result 39186 states and 69580 transitions. [2021-11-25 19:35:44,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:35:44,648 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 86 [2021-11-25 19:35:44,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:44,884 INFO L225 Difference]: With dead ends: 39186 [2021-11-25 19:35:44,884 INFO L226 Difference]: Without dead ends: 26334 [2021-11-25 19:35:44,958 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:44,959 INFO L933 BasicCegarLoop]: 598 mSDtfsCounter, 1092 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 374 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1158 SdHoareTripleChecker+Valid, 987 SdHoareTripleChecker+Invalid, 1051 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 374 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:44,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1158 Valid, 987 Invalid, 1051 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [374 Valid, 677 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:35:44,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26334 states. [2021-11-25 19:35:46,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26334 to 25266. [2021-11-25 19:35:46,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25266 states, 18319 states have (on average 1.61520825372564) internal successors, (29589), 19603 states have internal predecessors, (29589), 5276 states have call successors, (5276), 1319 states have call predecessors, (5276), 1670 states have return successors, (8905), 4769 states have call predecessors, (8905), 5271 states have call successors, (8905) [2021-11-25 19:35:47,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25266 states to 25266 states and 43770 transitions. [2021-11-25 19:35:47,058 INFO L78 Accepts]: Start accepts. Automaton has 25266 states and 43770 transitions. Word has length 86 [2021-11-25 19:35:47,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:47,059 INFO L470 AbstractCegarLoop]: Abstraction has 25266 states and 43770 transitions. [2021-11-25 19:35:47,059 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:35:47,059 INFO L276 IsEmpty]: Start isEmpty. Operand 25266 states and 43770 transitions. [2021-11-25 19:35:47,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-25 19:35:47,068 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:47,068 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:47,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 19:35:47,068 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:47,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:47,069 INFO L85 PathProgramCache]: Analyzing trace with hash -991421385, now seen corresponding path program 1 times [2021-11-25 19:35:47,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:47,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381118215] [2021-11-25 19:35:47,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:47,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:47,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:47,191 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-25 19:35:47,192 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:47,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381118215] [2021-11-25 19:35:47,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [381118215] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:47,192 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:47,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:35:47,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649685966] [2021-11-25 19:35:47,193 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:47,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:47,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:47,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:47,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:47,195 INFO L87 Difference]: Start difference. First operand 25266 states and 43770 transitions. Second operand has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-25 19:35:49,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:49,012 INFO L93 Difference]: Finished difference Result 54175 states and 97351 transitions. [2021-11-25 19:35:49,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:35:49,013 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) Word has length 130 [2021-11-25 19:35:49,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:49,373 INFO L225 Difference]: With dead ends: 54175 [2021-11-25 19:35:49,373 INFO L226 Difference]: Without dead ends: 28926 [2021-11-25 19:35:49,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:49,510 INFO L933 BasicCegarLoop]: 600 mSDtfsCounter, 123 mSDsluCounter, 1170 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 1708 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:49,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 1708 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:49,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28926 states. [2021-11-25 19:35:51,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28926 to 25506. [2021-11-25 19:35:51,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25506 states, 18542 states have (on average 1.610344083701866) internal successors, (29859), 19810 states have internal predecessors, (29859), 5293 states have call successors, (5293), 1319 states have call predecessors, (5293), 1670 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-25 19:35:51,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25506 states to 25506 states and 44074 transitions. [2021-11-25 19:35:51,320 INFO L78 Accepts]: Start accepts. Automaton has 25506 states and 44074 transitions. Word has length 130 [2021-11-25 19:35:51,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:51,320 INFO L470 AbstractCegarLoop]: Abstraction has 25506 states and 44074 transitions. [2021-11-25 19:35:51,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-25 19:35:51,321 INFO L276 IsEmpty]: Start isEmpty. Operand 25506 states and 44074 transitions. [2021-11-25 19:35:51,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-25 19:35:51,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:51,331 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:51,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 19:35:51,332 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:51,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:51,333 INFO L85 PathProgramCache]: Analyzing trace with hash 691666656, now seen corresponding path program 1 times [2021-11-25 19:35:51,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:51,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140788792] [2021-11-25 19:35:51,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:51,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:51,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:51,454 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-25 19:35:51,454 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:51,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140788792] [2021-11-25 19:35:51,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [140788792] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:51,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671074501] [2021-11-25 19:35:51,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:51,455 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:51,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:51,459 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:51,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:35:51,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:51,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 1775 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:35:51,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:52,180 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 19:35:52,180 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:35:52,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671074501] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:52,181 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:35:52,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 19:35:52,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139493816] [2021-11-25 19:35:52,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:52,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:52,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:52,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:52,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:35:52,183 INFO L87 Difference]: Start difference. First operand 25506 states and 44074 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:35:54,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:54,141 INFO L93 Difference]: Finished difference Result 53491 states and 95734 transitions. [2021-11-25 19:35:54,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:35:54,141 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) Word has length 133 [2021-11-25 19:35:54,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:54,302 INFO L225 Difference]: With dead ends: 53491 [2021-11-25 19:35:54,302 INFO L226 Difference]: Without dead ends: 28002 [2021-11-25 19:35:54,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:35:54,404 INFO L933 BasicCegarLoop]: 478 mSDtfsCounter, 213 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1410 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:54,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 1410 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:35:54,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28002 states. [2021-11-25 19:35:55,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28002 to 28002. [2021-11-25 19:35:55,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28002 states, 20974 states have (on average 1.646371698293125) internal successors, (34531), 22242 states have internal predecessors, (34531), 5293 states have call successors, (5293), 1383 states have call predecessors, (5293), 1734 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-25 19:35:56,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28002 states to 28002 states and 48746 transitions. [2021-11-25 19:35:56,051 INFO L78 Accepts]: Start accepts. Automaton has 28002 states and 48746 transitions. Word has length 133 [2021-11-25 19:35:56,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:56,051 INFO L470 AbstractCegarLoop]: Abstraction has 28002 states and 48746 transitions. [2021-11-25 19:35:56,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:35:56,052 INFO L276 IsEmpty]: Start isEmpty. Operand 28002 states and 48746 transitions. [2021-11-25 19:35:56,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-25 19:35:56,059 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:56,060 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:56,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:56,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 19:35:56,274 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:35:56,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:56,275 INFO L85 PathProgramCache]: Analyzing trace with hash 534073228, now seen corresponding path program 1 times [2021-11-25 19:35:56,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:56,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057421421] [2021-11-25 19:35:56,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:56,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:56,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:56,390 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-25 19:35:56,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:56,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057421421] [2021-11-25 19:35:56,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2057421421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:56,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152173874] [2021-11-25 19:35:56,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:56,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:56,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:56,392 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:56,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:35:56,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:56,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 1780 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:35:56,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:57,239 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-25 19:35:57,240 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:35:57,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152173874] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:57,240 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:35:57,241 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 19:35:57,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877049604] [2021-11-25 19:35:57,241 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:57,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:57,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:57,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:57,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:35:57,243 INFO L87 Difference]: Start difference. First operand 28002 states and 48746 transitions. Second operand has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:35:58,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:58,631 INFO L93 Difference]: Finished difference Result 58483 states and 105012 transitions. [2021-11-25 19:35:58,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:35:58,632 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) Word has length 138 [2021-11-25 19:35:58,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:58,768 INFO L225 Difference]: With dead ends: 58483 [2021-11-25 19:35:58,768 INFO L226 Difference]: Without dead ends: 30498 [2021-11-25 19:35:58,864 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:35:58,865 INFO L933 BasicCegarLoop]: 478 mSDtfsCounter, 211 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1410 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:58,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1410 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 233 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:35:58,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30498 states. [2021-11-25 19:36:00,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30498 to 30498. [2021-11-25 19:36:00,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30498 states, 23406 states have (on average 1.6749124156199264) internal successors, (39203), 24674 states have internal predecessors, (39203), 5293 states have call successors, (5293), 1447 states have call predecessors, (5293), 1798 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-25 19:36:00,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30498 states to 30498 states and 53418 transitions. [2021-11-25 19:36:00,537 INFO L78 Accepts]: Start accepts. Automaton has 30498 states and 53418 transitions. Word has length 138 [2021-11-25 19:36:00,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:00,538 INFO L470 AbstractCegarLoop]: Abstraction has 30498 states and 53418 transitions. [2021-11-25 19:36:00,538 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:36:00,538 INFO L276 IsEmpty]: Start isEmpty. Operand 30498 states and 53418 transitions. [2021-11-25 19:36:00,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-25 19:36:00,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:00,564 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:00,596 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-25 19:36:00,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 19:36:00,782 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:36:00,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:00,783 INFO L85 PathProgramCache]: Analyzing trace with hash 373862348, now seen corresponding path program 1 times [2021-11-25 19:36:00,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:00,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008268645] [2021-11-25 19:36:00,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:00,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:00,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:00,889 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-25 19:36:00,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:00,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008268645] [2021-11-25 19:36:00,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008268645] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:00,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31119532] [2021-11-25 19:36:00,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:00,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:00,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:00,898 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:00,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:36:01,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:01,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 1784 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:36:01,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:01,465 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 19:36:01,466 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:36:01,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31119532] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:36:01,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:36:01,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 19:36:01,467 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54166269] [2021-11-25 19:36:01,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:36:01,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:36:01,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:01,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:36:01,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:36:01,468 INFO L87 Difference]: Start difference. First operand 30498 states and 53418 transitions. Second operand has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:36:02,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:02,918 INFO L93 Difference]: Finished difference Result 63475 states and 114290 transitions. [2021-11-25 19:36:02,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:36:02,919 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) Word has length 142 [2021-11-25 19:36:02,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:03,055 INFO L225 Difference]: With dead ends: 63475 [2021-11-25 19:36:03,055 INFO L226 Difference]: Without dead ends: 32994 [2021-11-25 19:36:03,150 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:36:03,151 INFO L933 BasicCegarLoop]: 478 mSDtfsCounter, 209 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1410 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:03,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1410 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:36:03,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32994 states. [2021-11-25 19:36:04,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32994 to 32994. [2021-11-25 19:36:04,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32994 states, 25838 states have (on average 1.6980803467760663) internal successors, (43875), 27106 states have internal predecessors, (43875), 5293 states have call successors, (5293), 1511 states have call predecessors, (5293), 1862 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-25 19:36:04,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32994 states to 32994 states and 58090 transitions. [2021-11-25 19:36:04,752 INFO L78 Accepts]: Start accepts. Automaton has 32994 states and 58090 transitions. Word has length 142 [2021-11-25 19:36:04,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:04,753 INFO L470 AbstractCegarLoop]: Abstraction has 32994 states and 58090 transitions. [2021-11-25 19:36:04,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:36:04,754 INFO L276 IsEmpty]: Start isEmpty. Operand 32994 states and 58090 transitions. [2021-11-25 19:36:04,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 19:36:04,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:04,761 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:04,789 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-25 19:36:04,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 19:36:04,966 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:36:04,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:04,966 INFO L85 PathProgramCache]: Analyzing trace with hash -1186874624, now seen corresponding path program 1 times [2021-11-25 19:36:04,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:04,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496571186] [2021-11-25 19:36:04,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:04,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:05,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:05,636 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 2 proven. 40 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-25 19:36:05,636 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:05,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496571186] [2021-11-25 19:36:05,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496571186] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:05,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1237141891] [2021-11-25 19:36:05,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:05,637 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:05,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:05,639 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:05,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:36:05,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:06,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 1787 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:36:06,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:06,293 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-25 19:36:06,293 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:36:06,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1237141891] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:36:06,294 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:36:06,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [26] total 28 [2021-11-25 19:36:06,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594968592] [2021-11-25 19:36:06,297 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:36:06,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:36:06,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:06,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:36:06,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=667, Unknown=0, NotChecked=0, Total=756 [2021-11-25 19:36:06,299 INFO L87 Difference]: Start difference. First operand 32994 states and 58090 transitions. Second operand has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:36:07,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:07,721 INFO L93 Difference]: Finished difference Result 68467 states and 123568 transitions. [2021-11-25 19:36:07,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:36:07,721 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) Word has length 145 [2021-11-25 19:36:07,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:07,843 INFO L225 Difference]: With dead ends: 68467 [2021-11-25 19:36:07,843 INFO L226 Difference]: Without dead ends: 35490 [2021-11-25 19:36:07,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=93, Invalid=719, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:36:07,917 INFO L933 BasicCegarLoop]: 478 mSDtfsCounter, 207 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1410 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:07,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1410 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:36:07,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35490 states. [2021-11-25 19:36:09,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35490 to 35490. [2021-11-25 19:36:09,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35490 states, 28270 states have (on average 1.7172621153165901) internal successors, (48547), 29538 states have internal predecessors, (48547), 5293 states have call successors, (5293), 1575 states have call predecessors, (5293), 1926 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-25 19:36:09,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35490 states to 35490 states and 62762 transitions. [2021-11-25 19:36:09,521 INFO L78 Accepts]: Start accepts. Automaton has 35490 states and 62762 transitions. Word has length 145 [2021-11-25 19:36:09,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:09,522 INFO L470 AbstractCegarLoop]: Abstraction has 35490 states and 62762 transitions. [2021-11-25 19:36:09,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:36:09,522 INFO L276 IsEmpty]: Start isEmpty. Operand 35490 states and 62762 transitions. [2021-11-25 19:36:09,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-25 19:36:09,532 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:09,532 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:09,573 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-25 19:36:09,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 19:36:09,746 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:36:09,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:09,746 INFO L85 PathProgramCache]: Analyzing trace with hash 1653615918, now seen corresponding path program 1 times [2021-11-25 19:36:09,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:09,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942323664] [2021-11-25 19:36:09,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:09,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:09,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:10,355 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-25 19:36:10,356 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:10,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942323664] [2021-11-25 19:36:10,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942323664] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:10,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744141444] [2021-11-25 19:36:10,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:10,356 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:10,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:10,357 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:10,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:36:10,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:10,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 1783 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:36:10,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:11,062 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-25 19:36:11,062 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:36:11,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744141444] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:36:11,062 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:36:11,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [26] total 29 [2021-11-25 19:36:11,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882877146] [2021-11-25 19:36:11,063 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:36:11,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:36:11,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:11,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:36:11,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=719, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:36:11,065 INFO L87 Difference]: Start difference. First operand 35490 states and 62762 transitions. Second operand has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 2 states have call predecessors, (22), 1 states have call successors, (22) [2021-11-25 19:36:12,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:12,420 INFO L93 Difference]: Finished difference Result 36631 states and 66190 transitions. [2021-11-25 19:36:12,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:36:12,421 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 2 states have call predecessors, (22), 1 states have call successors, (22) Word has length 147 [2021-11-25 19:36:12,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:12,597 INFO L225 Difference]: With dead ends: 36631 [2021-11-25 19:36:12,597 INFO L226 Difference]: Without dead ends: 36474 [2021-11-25 19:36:12,618 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=93, Invalid=719, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:36:12,619 INFO L933 BasicCegarLoop]: 543 mSDtfsCounter, 558 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 900 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:12,619 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [566 Valid, 900 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:36:12,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36474 states. [2021-11-25 19:36:14,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36474 to 35552. [2021-11-25 19:36:14,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35552 states, 28332 states have (on average 1.7156925031766201) internal successors, (48609), 29600 states have internal predecessors, (48609), 5293 states have call successors, (5293), 1575 states have call predecessors, (5293), 1926 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-25 19:36:14,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35552 states to 35552 states and 62824 transitions. [2021-11-25 19:36:14,633 INFO L78 Accepts]: Start accepts. Automaton has 35552 states and 62824 transitions. Word has length 147 [2021-11-25 19:36:14,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:14,634 INFO L470 AbstractCegarLoop]: Abstraction has 35552 states and 62824 transitions. [2021-11-25 19:36:14,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 2 states have call predecessors, (22), 1 states have call successors, (22) [2021-11-25 19:36:14,634 INFO L276 IsEmpty]: Start isEmpty. Operand 35552 states and 62824 transitions. [2021-11-25 19:36:14,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-25 19:36:14,644 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:14,644 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:14,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-25 19:36:14,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:14,870 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:36:14,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:14,870 INFO L85 PathProgramCache]: Analyzing trace with hash 1836606761, now seen corresponding path program 1 times [2021-11-25 19:36:14,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:14,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164557608] [2021-11-25 19:36:14,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:14,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:14,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:15,532 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-25 19:36:15,533 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:15,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164557608] [2021-11-25 19:36:15,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164557608] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:15,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1677426313] [2021-11-25 19:36:15,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:15,534 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:15,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:15,535 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:15,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:36:15,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:15,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 1798 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:36:15,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:16,186 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-25 19:36:16,186 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:36:16,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1677426313] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:36:16,187 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:36:16,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [26] total 29 [2021-11-25 19:36:16,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444178085] [2021-11-25 19:36:16,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:36:16,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:36:16,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:16,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:36:16,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=722, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:36:16,189 INFO L87 Difference]: Start difference. First operand 35552 states and 62824 transitions. Second operand has 5 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 3 states have call predecessors, (23), 1 states have call successors, (23) [2021-11-25 19:36:17,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:17,279 INFO L93 Difference]: Finished difference Result 35779 states and 63109 transitions. [2021-11-25 19:36:17,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:36:17,280 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 3 states have call predecessors, (23), 1 states have call successors, (23) Word has length 152 [2021-11-25 19:36:17,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:17,395 INFO L225 Difference]: With dead ends: 35779 [2021-11-25 19:36:17,395 INFO L226 Difference]: Without dead ends: 35622 [2021-11-25 19:36:17,412 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=94, Invalid=776, Unknown=0, NotChecked=0, Total=870 [2021-11-25 19:36:17,413 INFO L933 BasicCegarLoop]: 546 mSDtfsCounter, 30 mSDsluCounter, 1691 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 2148 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:17,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 2148 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:36:17,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35622 states. [2021-11-25 19:36:18,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35622 to 35552. [2021-11-25 19:36:18,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35552 states, 28332 states have (on average 1.7135041649018776) internal successors, (48547), 29600 states have internal predecessors, (48547), 5293 states have call successors, (5293), 1575 states have call predecessors, (5293), 1926 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-25 19:36:19,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35552 states to 35552 states and 62762 transitions. [2021-11-25 19:36:19,095 INFO L78 Accepts]: Start accepts. Automaton has 35552 states and 62762 transitions. Word has length 152 [2021-11-25 19:36:19,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:19,096 INFO L470 AbstractCegarLoop]: Abstraction has 35552 states and 62762 transitions. [2021-11-25 19:36:19,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 3 states have call predecessors, (23), 1 states have call successors, (23) [2021-11-25 19:36:19,096 INFO L276 IsEmpty]: Start isEmpty. Operand 35552 states and 62762 transitions. [2021-11-25 19:36:19,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-25 19:36:19,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:19,110 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:19,153 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:19,338 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:19,338 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:36:19,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:19,339 INFO L85 PathProgramCache]: Analyzing trace with hash 729561048, now seen corresponding path program 1 times [2021-11-25 19:36:19,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:19,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271828581] [2021-11-25 19:36:19,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:19,339 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:19,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:20,019 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 19:36:20,019 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:20,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271828581] [2021-11-25 19:36:20,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271828581] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:20,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112987438] [2021-11-25 19:36:20,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:20,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:20,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:20,021 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:20,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:36:20,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:20,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 1828 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 19:36:20,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:20,723 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2021-11-25 19:36:20,724 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:36:20,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112987438] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:36:20,724 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:36:20,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [26] total 28 [2021-11-25 19:36:20,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595688706] [2021-11-25 19:36:20,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:36:20,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:36:20,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:20,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:36:20,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=668, Unknown=0, NotChecked=0, Total=756 [2021-11-25 19:36:20,727 INFO L87 Difference]: Start difference. First operand 35552 states and 62762 transitions. Second operand has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) [2021-11-25 19:36:21,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:21,973 INFO L93 Difference]: Finished difference Result 37172 states and 68405 transitions. [2021-11-25 19:36:21,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:36:21,974 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) Word has length 159 [2021-11-25 19:36:21,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:22,124 INFO L225 Difference]: With dead ends: 37172 [2021-11-25 19:36:22,124 INFO L226 Difference]: Without dead ends: 37015 [2021-11-25 19:36:22,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=92, Invalid=720, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:36:22,378 INFO L933 BasicCegarLoop]: 581 mSDtfsCounter, 44 mSDsluCounter, 1168 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 1690 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:22,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 1690 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:36:22,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37015 states. [2021-11-25 19:36:23,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37015 to 35676. [2021-11-25 19:36:23,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35676 states, 28456 states have (on average 1.7103949957829632) internal successors, (48671), 29724 states have internal predecessors, (48671), 5293 states have call successors, (5293), 1575 states have call predecessors, (5293), 1926 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-25 19:36:23,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35676 states to 35676 states and 62886 transitions. [2021-11-25 19:36:23,812 INFO L78 Accepts]: Start accepts. Automaton has 35676 states and 62886 transitions. Word has length 159 [2021-11-25 19:36:23,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:23,813 INFO L470 AbstractCegarLoop]: Abstraction has 35676 states and 62886 transitions. [2021-11-25 19:36:23,813 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) [2021-11-25 19:36:23,813 INFO L276 IsEmpty]: Start isEmpty. Operand 35676 states and 62886 transitions. [2021-11-25 19:36:23,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-11-25 19:36:23,831 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:23,832 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:23,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:24,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 19:36:24,046 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:36:24,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:24,047 INFO L85 PathProgramCache]: Analyzing trace with hash 2013078306, now seen corresponding path program 1 times [2021-11-25 19:36:24,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:24,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694258939] [2021-11-25 19:36:24,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:24,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:24,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:24,677 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-25 19:36:24,677 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:24,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694258939] [2021-11-25 19:36:24,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694258939] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:24,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592455831] [2021-11-25 19:36:24,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:24,678 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:24,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:24,679 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:24,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e4e0455b-ad82-476b-9751-378d8761a7cf/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:36:24,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:24,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 1892 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 19:36:24,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:26,566 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-25 19:36:26,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:29,695 WARN L176 XnfTransformerHelper]: Simplifying conjuction of 9813 disjunctions. This might take some time... [2021-11-25 19:36:35,926 INFO L192 XnfTransformerHelper]: Simplified to conjuction of 9813 disjunctions. [2021-11-25 19:36:36,249 WARN L176 XnfTransformerHelper]: Simplifying conjuction of 9813 disjunctions. This might take some time...