./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec14_product31.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_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/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_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec14_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/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_7626b1d8-527e-452d-b896-129ee50000eb/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 866b4070887ce539f36e137c6ed6e587ee3f43d9563c34ef0dd3382aa4e2313a --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:25:23,379 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:25:23,382 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:25:23,434 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:25:23,435 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:25:23,439 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:25:23,441 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:25:23,445 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:25:23,447 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:25:23,453 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:25:23,454 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:25:23,456 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:25:23,456 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:25:23,459 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:25:23,461 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:25:23,465 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:25:23,467 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:25:23,469 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:25:23,474 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:25:23,482 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:25:23,484 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:25:23,485 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:25:23,488 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:25:23,489 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:25:23,500 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:25:23,500 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:25:23,501 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:25:23,502 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:25:23,502 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:25:23,503 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:25:23,504 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:25:23,505 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:25:23,506 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:25:23,507 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:25:23,508 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:25:23,509 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:25:23,509 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:25:23,510 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:25:23,510 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:25:23,511 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:25:23,512 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:25:23,513 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:25:23,543 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:25:23,544 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:25:23,544 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:25:23,544 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:25:23,545 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:25:23,545 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:25:23,545 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:25:23,545 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:25:23,546 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:25:23,546 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:25:23,546 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:25:23,546 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:25:23,546 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:25:23,546 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:25:23,547 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:25:23,547 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:25:23,547 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:25:23,547 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:25:23,548 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:25:23,548 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:25:23,548 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:25:23,549 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:25:23,549 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:25:23,549 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:25:23,549 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:25:23,549 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:25:23,549 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:25:23,550 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:25:23,550 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:25:23,550 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:25:23,550 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:25:23,550 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:25:23,551 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:25:23,551 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:25:23,551 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:25:23,551 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:25:23,551 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:25:23,551 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:25:23,552 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:25:23,552 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:25:23,552 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:25:23,552 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_7626b1d8-527e-452d-b896-129ee50000eb/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 866b4070887ce539f36e137c6ed6e587ee3f43d9563c34ef0dd3382aa4e2313a [2021-11-25 18:25:23,863 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:25:23,896 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:25:23,899 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:25:23,900 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:25:23,901 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:25:23,902 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/product-lines/elevator_spec14_product31.cil.c [2021-11-25 18:25:23,974 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/data/95ecf432a/6b25aa3b3312490cab8b4a63061c439a/FLAGd6a70ca47 [2021-11-25 18:25:24,606 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:25:24,606 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/sv-benchmarks/c/product-lines/elevator_spec14_product31.cil.c [2021-11-25 18:25:24,643 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/data/95ecf432a/6b25aa3b3312490cab8b4a63061c439a/FLAGd6a70ca47 [2021-11-25 18:25:24,836 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/data/95ecf432a/6b25aa3b3312490cab8b4a63061c439a [2021-11-25 18:25:24,838 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:25:24,840 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:25:24,841 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:25:24,841 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:25:24,845 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:25:24,845 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:25:24" (1/1) ... [2021-11-25 18:25:24,846 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f9d2c58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:24, skipping insertion in model container [2021-11-25 18:25:24,846 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:25:24" (1/1) ... [2021-11-25 18:25:24,853 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:25:24,951 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:25:25,487 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_7626b1d8-527e-452d-b896-129ee50000eb/sv-benchmarks/c/product-lines/elevator_spec14_product31.cil.c[71150,71163] [2021-11-25 18:25:25,495 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:25:25,506 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:25:25,675 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_7626b1d8-527e-452d-b896-129ee50000eb/sv-benchmarks/c/product-lines/elevator_spec14_product31.cil.c[71150,71163] [2021-11-25 18:25:25,676 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:25:25,703 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:25:25,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25 WrapperNode [2021-11-25 18:25:25,703 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:25:25,705 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:25:25,705 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:25:25,705 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:25:25,713 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25" (1/1) ... [2021-11-25 18:25:25,767 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25" (1/1) ... [2021-11-25 18:25:25,828 INFO L137 Inliner]: procedures = 94, calls = 342, calls flagged for inlining = 29, calls inlined = 26, statements flattened = 898 [2021-11-25 18:25:25,829 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:25:25,830 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:25:25,830 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:25:25,830 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:25:25,839 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25" (1/1) ... [2021-11-25 18:25:25,839 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25" (1/1) ... [2021-11-25 18:25:25,852 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25" (1/1) ... [2021-11-25 18:25:25,852 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25" (1/1) ... [2021-11-25 18:25:25,892 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25" (1/1) ... [2021-11-25 18:25:25,935 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25" (1/1) ... [2021-11-25 18:25:25,941 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25" (1/1) ... [2021-11-25 18:25:25,977 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:25:25,978 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:25:25,978 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:25:25,979 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:25:25,980 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25" (1/1) ... [2021-11-25 18:25:26,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:25:26,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:25:26,036 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:25:26,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:25:26,091 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:25:26,092 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2021-11-25 18:25:26,092 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2021-11-25 18:25:26,092 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-25 18:25:26,092 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-25 18:25:26,093 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2021-11-25 18:25:26,093 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2021-11-25 18:25:26,093 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-25 18:25:26,093 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-25 18:25:26,093 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2021-11-25 18:25:26,093 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2021-11-25 18:25:26,093 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-25 18:25:26,094 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-25 18:25:26,094 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2021-11-25 18:25:26,094 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2021-11-25 18:25:26,094 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-25 18:25:26,095 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-25 18:25:26,095 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__empty [2021-11-25 18:25:26,095 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__empty [2021-11-25 18:25:26,095 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-25 18:25:26,096 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-25 18:25:26,096 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-25 18:25:26,096 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-25 18:25:26,096 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-25 18:25:26,096 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-25 18:25:26,096 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-25 18:25:26,096 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-25 18:25:26,097 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-25 18:25:26,097 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-25 18:25:26,097 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-25 18:25:26,097 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-25 18:25:26,099 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-25 18:25:26,099 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-25 18:25:26,099 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-25 18:25:26,099 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-25 18:25:26,100 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-25 18:25:26,100 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-25 18:25:26,100 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-25 18:25:26,100 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-25 18:25:26,100 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-25 18:25:26,101 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-25 18:25:26,101 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:25:26,101 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-25 18:25:26,101 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-25 18:25:26,101 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-25 18:25:26,102 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-25 18:25:26,102 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-25 18:25:26,103 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-25 18:25:26,103 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-25 18:25:26,104 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-25 18:25:26,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:25:26,105 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:25:26,105 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-25 18:25:26,105 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-25 18:25:26,298 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:25:26,301 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:25:27,465 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:25:28,129 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:25:28,129 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 18:25:28,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:25:28 BoogieIcfgContainer [2021-11-25 18:25:28,134 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:25:28,137 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:25:28,137 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:25:28,141 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:25:28,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:25:24" (1/3) ... [2021-11-25 18:25:28,142 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47ecf2c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:25:28, skipping insertion in model container [2021-11-25 18:25:28,142 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:25:25" (2/3) ... [2021-11-25 18:25:28,143 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47ecf2c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:25:28, skipping insertion in model container [2021-11-25 18:25:28,143 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:25:28" (3/3) ... [2021-11-25 18:25:28,144 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec14_product31.cil.c [2021-11-25 18:25:28,150 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:25:28,150 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:25:28,224 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:25:28,233 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 18:25:28,234 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:25:28,282 INFO L276 IsEmpty]: Start isEmpty. Operand has 376 states, 250 states have (on average 1.552) internal successors, (388), 266 states have internal predecessors, (388), 99 states have call successors, (99), 25 states have call predecessors, (99), 25 states have return successors, (99), 97 states have call predecessors, (99), 99 states have call successors, (99) [2021-11-25 18:25:28,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 18:25:28,312 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:28,313 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:25:28,314 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:28,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:28,319 INFO L85 PathProgramCache]: Analyzing trace with hash 1956872798, now seen corresponding path program 1 times [2021-11-25 18:25:28,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:28,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025697282] [2021-11-25 18:25:28,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:28,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:28,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:28,806 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:25:28,806 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:28,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025697282] [2021-11-25 18:25:28,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025697282] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:25:28,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:25:28,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:25:28,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008692559] [2021-11-25 18:25:28,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:25:28,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:25:28,817 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:25:28,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:25:28,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:25:28,862 INFO L87 Difference]: Start difference. First operand has 376 states, 250 states have (on average 1.552) internal successors, (388), 266 states have internal predecessors, (388), 99 states have call successors, (99), 25 states have call predecessors, (99), 25 states have return successors, (99), 97 states have call predecessors, (99), 99 states have call successors, (99) Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 18:25:29,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:25:29,703 INFO L93 Difference]: Finished difference Result 1106 states and 1750 transitions. [2021-11-25 18:25:29,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:25:29,707 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 73 [2021-11-25 18:25:29,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:25:29,734 INFO L225 Difference]: With dead ends: 1106 [2021-11-25 18:25:29,735 INFO L226 Difference]: Without dead ends: 731 [2021-11-25 18:25:29,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:25:29,752 INFO L933 BasicCegarLoop]: 697 mSDtfsCounter, 561 mSDsluCounter, 1852 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 561 SdHoareTripleChecker+Valid, 2428 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:25:29,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [561 Valid, 2428 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:25:29,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 731 states. [2021-11-25 18:25:29,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 731 to 725. [2021-11-25 18:25:29,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 725 states, 485 states have (on average 1.5422680412371135) internal successors, (748), 514 states have internal predecessors, (748), 192 states have call successors, (192), 49 states have call predecessors, (192), 47 states have return successors, (198), 186 states have call predecessors, (198), 190 states have call successors, (198) [2021-11-25 18:25:29,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 725 states to 725 states and 1138 transitions. [2021-11-25 18:25:29,921 INFO L78 Accepts]: Start accepts. Automaton has 725 states and 1138 transitions. Word has length 73 [2021-11-25 18:25:29,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:25:29,922 INFO L470 AbstractCegarLoop]: Abstraction has 725 states and 1138 transitions. [2021-11-25 18:25:29,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 3 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 18:25:29,927 INFO L276 IsEmpty]: Start isEmpty. Operand 725 states and 1138 transitions. [2021-11-25 18:25:29,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-25 18:25:29,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:29,933 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 18:25:29,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:25:29,934 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:29,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:29,935 INFO L85 PathProgramCache]: Analyzing trace with hash 198398302, now seen corresponding path program 1 times [2021-11-25 18:25:29,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:29,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205239100] [2021-11-25 18:25:29,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:29,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:29,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:30,081 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:25:30,081 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:30,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205239100] [2021-11-25 18:25:30,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1205239100] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:25:30,082 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:25:30,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:25:30,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33935880] [2021-11-25 18:25:30,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:25:30,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:25:30,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:25:30,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:25:30,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:25:30,086 INFO L87 Difference]: Start difference. First operand 725 states and 1138 transitions. Second operand has 5 states, 5 states have (on average 7.6) internal successors, (38), 5 states have internal predecessors, (38), 3 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 18:25:30,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:25:30,762 INFO L93 Difference]: Finished difference Result 834 states and 1301 transitions. [2021-11-25 18:25:30,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:25:30,763 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.6) internal successors, (38), 5 states have internal predecessors, (38), 3 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 77 [2021-11-25 18:25:30,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:25:30,774 INFO L225 Difference]: With dead ends: 834 [2021-11-25 18:25:30,774 INFO L226 Difference]: Without dead ends: 832 [2021-11-25 18:25:30,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 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 18:25:30,781 INFO L933 BasicCegarLoop]: 673 mSDtfsCounter, 684 mSDsluCounter, 1164 mSDsCounter, 0 mSdLazyCounter, 439 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 684 SdHoareTripleChecker+Valid, 1740 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:25:30,782 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [684 Valid, 1740 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 439 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:25:30,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 832 states. [2021-11-25 18:25:30,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 832 to 822. [2021-11-25 18:25:30,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 822 states, 544 states have (on average 1.5091911764705883) internal successors, (821), 573 states have internal predecessors, (821), 217 states have call successors, (217), 63 states have call predecessors, (217), 60 states have return successors, (229), 209 states have call predecessors, (229), 214 states have call successors, (229) [2021-11-25 18:25:30,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 822 states to 822 states and 1267 transitions. [2021-11-25 18:25:30,938 INFO L78 Accepts]: Start accepts. Automaton has 822 states and 1267 transitions. Word has length 77 [2021-11-25 18:25:30,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:25:30,942 INFO L470 AbstractCegarLoop]: Abstraction has 822 states and 1267 transitions. [2021-11-25 18:25:30,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.6) internal successors, (38), 5 states have internal predecessors, (38), 3 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 18:25:30,942 INFO L276 IsEmpty]: Start isEmpty. Operand 822 states and 1267 transitions. [2021-11-25 18:25:30,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-25 18:25:30,951 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:30,951 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:25:30,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:25:30,952 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:30,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:30,952 INFO L85 PathProgramCache]: Analyzing trace with hash 732809131, now seen corresponding path program 1 times [2021-11-25 18:25:30,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:30,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010459144] [2021-11-25 18:25:30,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:30,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:31,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:31,136 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 18:25:31,137 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:31,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010459144] [2021-11-25 18:25:31,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010459144] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:25:31,139 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:25:31,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:25:31,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945272990] [2021-11-25 18:25:31,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:25:31,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:25:31,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:25:31,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:25:31,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:25:31,144 INFO L87 Difference]: Start difference. First operand 822 states and 1267 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (16), 1 states have call predecessors, (16), 1 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-25 18:25:31,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:25:31,338 INFO L93 Difference]: Finished difference Result 1670 states and 2603 transitions. [2021-11-25 18:25:31,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:25:31,338 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (16), 1 states have call predecessors, (16), 1 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) Word has length 108 [2021-11-25 18:25:31,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:25:31,346 INFO L225 Difference]: With dead ends: 1670 [2021-11-25 18:25:31,346 INFO L226 Difference]: Without dead ends: 860 [2021-11-25 18:25:31,353 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 18:25:31,360 INFO L933 BasicCegarLoop]: 554 mSDtfsCounter, 54 mSDsluCounter, 1138 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 1621 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:25:31,362 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 1621 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:25:31,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 860 states. [2021-11-25 18:25:31,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 860 to 826. [2021-11-25 18:25:31,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 826 states, 548 states have (on average 1.5054744525547445) internal successors, (825), 577 states have internal predecessors, (825), 217 states have call successors, (217), 63 states have call predecessors, (217), 60 states have return successors, (229), 209 states have call predecessors, (229), 214 states have call successors, (229) [2021-11-25 18:25:31,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 826 states to 826 states and 1271 transitions. [2021-11-25 18:25:31,423 INFO L78 Accepts]: Start accepts. Automaton has 826 states and 1271 transitions. Word has length 108 [2021-11-25 18:25:31,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:25:31,424 INFO L470 AbstractCegarLoop]: Abstraction has 826 states and 1271 transitions. [2021-11-25 18:25:31,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (16), 1 states have call predecessors, (16), 1 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-25 18:25:31,424 INFO L276 IsEmpty]: Start isEmpty. Operand 826 states and 1271 transitions. [2021-11-25 18:25:31,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-25 18:25:31,429 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:31,430 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:25:31,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:25:31,430 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:31,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:31,431 INFO L85 PathProgramCache]: Analyzing trace with hash -2139720671, now seen corresponding path program 1 times [2021-11-25 18:25:31,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:31,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889626950] [2021-11-25 18:25:31,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:31,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:31,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:31,590 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-25 18:25:31,590 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:31,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889626950] [2021-11-25 18:25:31,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889626950] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:25:31,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1143280221] [2021-11-25 18:25:31,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:31,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:31,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:25:31,595 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:25:31,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:25:31,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:31,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 1297 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:25:31,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:25:32,279 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 18:25:32,279 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:25:32,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1143280221] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:25:32,279 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:25:32,280 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-25 18:25:32,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294553782] [2021-11-25 18:25:32,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:25:32,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:25:32,281 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:25:32,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:25:32,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:25:32,281 INFO L87 Difference]: Start difference. First operand 826 states and 1271 transitions. Second operand has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-25 18:25:32,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:25:32,591 INFO L93 Difference]: Finished difference Result 1718 states and 2692 transitions. [2021-11-25 18:25:32,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:25:32,592 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 115 [2021-11-25 18:25:32,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:25:32,600 INFO L225 Difference]: With dead ends: 1718 [2021-11-25 18:25:32,600 INFO L226 Difference]: Without dead ends: 904 [2021-11-25 18:25:32,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:25:32,608 INFO L933 BasicCegarLoop]: 473 mSDtfsCounter, 213 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1395 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:25:32,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 1395 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:25:32,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 904 states. [2021-11-25 18:25:32,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 904 to 904. [2021-11-25 18:25:32,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 904 states, 624 states have (on average 1.5560897435897436) internal successors, (971), 653 states have internal predecessors, (971), 217 states have call successors, (217), 65 states have call predecessors, (217), 62 states have return successors, (229), 209 states have call predecessors, (229), 214 states have call successors, (229) [2021-11-25 18:25:32,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 904 states to 904 states and 1417 transitions. [2021-11-25 18:25:32,666 INFO L78 Accepts]: Start accepts. Automaton has 904 states and 1417 transitions. Word has length 115 [2021-11-25 18:25:32,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:25:32,669 INFO L470 AbstractCegarLoop]: Abstraction has 904 states and 1417 transitions. [2021-11-25 18:25:32,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-25 18:25:32,670 INFO L276 IsEmpty]: Start isEmpty. Operand 904 states and 1417 transitions. [2021-11-25 18:25:32,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-25 18:25:32,680 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:32,680 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 3, 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] [2021-11-25 18:25:32,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:25:32,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:32,895 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:32,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:32,895 INFO L85 PathProgramCache]: Analyzing trace with hash -2119016035, now seen corresponding path program 1 times [2021-11-25 18:25:32,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:32,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789710922] [2021-11-25 18:25:32,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:32,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:32,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:33,002 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-25 18:25:33,002 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:33,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789710922] [2021-11-25 18:25:33,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [789710922] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:25:33,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172748778] [2021-11-25 18:25:33,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:33,003 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:33,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:25:33,004 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:25:33,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:25:33,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:33,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 1302 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:25:33,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:25:33,523 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 18:25:33,524 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:25:33,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172748778] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:25:33,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:25:33,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 18:25:33,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58960555] [2021-11-25 18:25:33,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:25:33,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:25:33,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:25:33,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:25:33,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:25:33,528 INFO L87 Difference]: Start difference. First operand 904 states and 1417 transitions. Second operand has 4 states, 4 states have (on average 17.75) internal successors, (71), 4 states have internal predecessors, (71), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-25 18:25:33,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:25:33,857 INFO L93 Difference]: Finished difference Result 1874 states and 2982 transitions. [2021-11-25 18:25:33,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:25:33,858 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.75) internal successors, (71), 4 states have internal predecessors, (71), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 120 [2021-11-25 18:25:33,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:25:33,866 INFO L225 Difference]: With dead ends: 1874 [2021-11-25 18:25:33,867 INFO L226 Difference]: Without dead ends: 982 [2021-11-25 18:25:33,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 120 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 18:25:33,875 INFO L933 BasicCegarLoop]: 473 mSDtfsCounter, 211 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1395 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:25:33,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1395 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:25:33,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 982 states. [2021-11-25 18:25:33,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 982 to 982. [2021-11-25 18:25:33,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 982 states, 700 states have (on average 1.5957142857142856) internal successors, (1117), 729 states have internal predecessors, (1117), 217 states have call successors, (217), 67 states have call predecessors, (217), 64 states have return successors, (229), 209 states have call predecessors, (229), 214 states have call successors, (229) [2021-11-25 18:25:33,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 982 states to 982 states and 1563 transitions. [2021-11-25 18:25:33,941 INFO L78 Accepts]: Start accepts. Automaton has 982 states and 1563 transitions. Word has length 120 [2021-11-25 18:25:33,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:25:33,942 INFO L470 AbstractCegarLoop]: Abstraction has 982 states and 1563 transitions. [2021-11-25 18:25:33,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.75) internal successors, (71), 4 states have internal predecessors, (71), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-25 18:25:33,942 INFO L276 IsEmpty]: Start isEmpty. Operand 982 states and 1563 transitions. [2021-11-25 18:25:33,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 18:25:33,949 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:33,949 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:25:33,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:25:34,166 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:34,167 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:34,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:34,167 INFO L85 PathProgramCache]: Analyzing trace with hash 1007849549, now seen corresponding path program 1 times [2021-11-25 18:25:34,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:34,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119954716] [2021-11-25 18:25:34,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:34,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:34,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:34,271 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 18:25:34,271 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:34,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119954716] [2021-11-25 18:25:34,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119954716] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:25:34,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853278600] [2021-11-25 18:25:34,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:34,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:34,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:25:34,273 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:25:34,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:25:34,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:34,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 1306 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:25:34,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:25:34,768 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 18:25:34,768 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:25:34,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [853278600] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:25:34,769 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:25:34,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 18:25:34,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932372522] [2021-11-25 18:25:34,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:25:34,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:25:34,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:25:34,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:25:34,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:25:34,771 INFO L87 Difference]: Start difference. First operand 982 states and 1563 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-25 18:25:35,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:25:35,069 INFO L93 Difference]: Finished difference Result 2030 states and 3272 transitions. [2021-11-25 18:25:35,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:25:35,069 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 124 [2021-11-25 18:25:35,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:25:35,078 INFO L225 Difference]: With dead ends: 2030 [2021-11-25 18:25:35,078 INFO L226 Difference]: Without dead ends: 1060 [2021-11-25 18:25:35,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 124 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 18:25:35,086 INFO L933 BasicCegarLoop]: 473 mSDtfsCounter, 209 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1395 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:25:35,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1395 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:25:35,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1060 states. [2021-11-25 18:25:35,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1060 to 1060. [2021-11-25 18:25:35,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1060 states, 776 states have (on average 1.6275773195876289) internal successors, (1263), 805 states have internal predecessors, (1263), 217 states have call successors, (217), 69 states have call predecessors, (217), 66 states have return successors, (229), 209 states have call predecessors, (229), 214 states have call successors, (229) [2021-11-25 18:25:35,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1060 states to 1060 states and 1709 transitions. [2021-11-25 18:25:35,174 INFO L78 Accepts]: Start accepts. Automaton has 1060 states and 1709 transitions. Word has length 124 [2021-11-25 18:25:35,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:25:35,174 INFO L470 AbstractCegarLoop]: Abstraction has 1060 states and 1709 transitions. [2021-11-25 18:25:35,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-25 18:25:35,175 INFO L276 IsEmpty]: Start isEmpty. Operand 1060 states and 1709 transitions. [2021-11-25 18:25:35,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 18:25:35,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:35,181 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 3, 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] [2021-11-25 18:25:35,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:25:35,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:35,407 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:35,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:35,407 INFO L85 PathProgramCache]: Analyzing trace with hash 1997009281, now seen corresponding path program 1 times [2021-11-25 18:25:35,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:35,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609623093] [2021-11-25 18:25:35,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:35,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:35,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:35,540 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 22 proven. 7 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-25 18:25:35,540 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:35,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609623093] [2021-11-25 18:25:35,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609623093] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:25:35,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1402464860] [2021-11-25 18:25:35,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:35,541 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:35,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:25:35,542 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:25:35,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:25:35,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:35,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 1309 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:25:35,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:25:36,050 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-25 18:25:36,051 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:25:36,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1402464860] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:25:36,051 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:25:36,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 18:25:36,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808772476] [2021-11-25 18:25:36,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:25:36,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:25:36,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:25:36,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:25:36,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:25:36,054 INFO L87 Difference]: Start difference. First operand 1060 states and 1709 transitions. Second operand has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-25 18:25:36,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:25:36,336 INFO L93 Difference]: Finished difference Result 2186 states and 3562 transitions. [2021-11-25 18:25:36,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:25:36,336 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 127 [2021-11-25 18:25:36,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:25:36,347 INFO L225 Difference]: With dead ends: 2186 [2021-11-25 18:25:36,348 INFO L226 Difference]: Without dead ends: 1138 [2021-11-25 18:25:36,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 127 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 18:25:36,357 INFO L933 BasicCegarLoop]: 473 mSDtfsCounter, 207 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1395 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:25:36,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1395 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:25:36,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1138 states. [2021-11-25 18:25:36,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1138 to 1138. [2021-11-25 18:25:36,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1138 states, 852 states have (on average 1.653755868544601) internal successors, (1409), 881 states have internal predecessors, (1409), 217 states have call successors, (217), 71 states have call predecessors, (217), 68 states have return successors, (229), 209 states have call predecessors, (229), 214 states have call successors, (229) [2021-11-25 18:25:36,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1138 states to 1138 states and 1855 transitions. [2021-11-25 18:25:36,414 INFO L78 Accepts]: Start accepts. Automaton has 1138 states and 1855 transitions. Word has length 127 [2021-11-25 18:25:36,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:25:36,415 INFO L470 AbstractCegarLoop]: Abstraction has 1138 states and 1855 transitions. [2021-11-25 18:25:36,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.75) internal successors, (79), 4 states have internal predecessors, (79), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-25 18:25:36,416 INFO L276 IsEmpty]: Start isEmpty. Operand 1138 states and 1855 transitions. [2021-11-25 18:25:36,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-25 18:25:36,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:36,423 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:25:36,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:25:36,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:36,647 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:36,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:36,647 INFO L85 PathProgramCache]: Analyzing trace with hash 1750071185, now seen corresponding path program 1 times [2021-11-25 18:25:36,647 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:36,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426547887] [2021-11-25 18:25:36,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:36,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:36,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:37,734 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 1 proven. 31 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-25 18:25:37,734 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:37,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426547887] [2021-11-25 18:25:37,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426547887] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:25:37,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324903095] [2021-11-25 18:25:37,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:37,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:37,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:25:37,751 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:25:37,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:25:38,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:38,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 1311 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:25:38,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:25:38,307 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-25 18:25:38,308 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:25:38,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324903095] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:25:38,308 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:25:38,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [35] total 37 [2021-11-25 18:25:38,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731524370] [2021-11-25 18:25:38,309 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:25:38,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:25:38,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:25:38,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:25:38,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1220, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 18:25:38,311 INFO L87 Difference]: Start difference. First operand 1138 states and 1855 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-25 18:25:38,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:25:38,595 INFO L93 Difference]: Finished difference Result 2342 states and 3852 transitions. [2021-11-25 18:25:38,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:25:38,596 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 129 [2021-11-25 18:25:38,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:25:38,607 INFO L225 Difference]: With dead ends: 2342 [2021-11-25 18:25:38,607 INFO L226 Difference]: Without dead ends: 1216 [2021-11-25 18:25:38,614 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=116, Invalid=1290, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 18:25:38,615 INFO L933 BasicCegarLoop]: 473 mSDtfsCounter, 205 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 1395 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:25:38,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 1395 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:25:38,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1216 states. [2021-11-25 18:25:38,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1216 to 1216. [2021-11-25 18:25:38,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1216 states, 928 states have (on average 1.675646551724138) internal successors, (1555), 957 states have internal predecessors, (1555), 217 states have call successors, (217), 73 states have call predecessors, (217), 70 states have return successors, (229), 209 states have call predecessors, (229), 214 states have call successors, (229) [2021-11-25 18:25:38,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1216 states to 1216 states and 2001 transitions. [2021-11-25 18:25:38,673 INFO L78 Accepts]: Start accepts. Automaton has 1216 states and 2001 transitions. Word has length 129 [2021-11-25 18:25:38,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:25:38,674 INFO L470 AbstractCegarLoop]: Abstraction has 1216 states and 2001 transitions. [2021-11-25 18:25:38,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 2 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2021-11-25 18:25:38,674 INFO L276 IsEmpty]: Start isEmpty. Operand 1216 states and 2001 transitions. [2021-11-25 18:25:38,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-25 18:25:38,680 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:38,680 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:25:38,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:25:38,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:38,895 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:38,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:38,895 INFO L85 PathProgramCache]: Analyzing trace with hash 227414720, now seen corresponding path program 1 times [2021-11-25 18:25:38,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:38,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990894622] [2021-11-25 18:25:38,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:38,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:38,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:39,010 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-25 18:25:39,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:39,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990894622] [2021-11-25 18:25:39,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [990894622] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:25:39,011 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:25:39,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 18:25:39,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739363617] [2021-11-25 18:25:39,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:25:39,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:25:39,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:25:39,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:25:39,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:25:39,013 INFO L87 Difference]: Start difference. First operand 1216 states and 2001 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:25:39,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:25:39,636 INFO L93 Difference]: Finished difference Result 2504 states and 4108 transitions. [2021-11-25 18:25:39,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:25:39,637 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 129 [2021-11-25 18:25:39,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:25:39,646 INFO L225 Difference]: With dead ends: 2504 [2021-11-25 18:25:39,646 INFO L226 Difference]: Without dead ends: 1113 [2021-11-25 18:25:39,655 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-11-25 18:25:39,657 INFO L933 BasicCegarLoop]: 615 mSDtfsCounter, 700 mSDsluCounter, 2326 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 700 SdHoareTripleChecker+Valid, 2798 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:25:39,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [700 Valid, 2798 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 18:25:39,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1113 states. [2021-11-25 18:25:39,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1113 to 1090. [2021-11-25 18:25:39,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1090 states, 782 states have (on average 1.5549872122762147) internal successors, (1216), 813 states have internal predecessors, (1216), 229 states have call successors, (229), 82 states have call predecessors, (229), 78 states have return successors, (249), 218 states have call predecessors, (249), 226 states have call successors, (249) [2021-11-25 18:25:39,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1090 states to 1090 states and 1694 transitions. [2021-11-25 18:25:39,752 INFO L78 Accepts]: Start accepts. Automaton has 1090 states and 1694 transitions. Word has length 129 [2021-11-25 18:25:39,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:25:39,753 INFO L470 AbstractCegarLoop]: Abstraction has 1090 states and 1694 transitions. [2021-11-25 18:25:39,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 4 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:25:39,753 INFO L276 IsEmpty]: Start isEmpty. Operand 1090 states and 1694 transitions. [2021-11-25 18:25:39,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-25 18:25:39,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:39,759 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:25:39,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 18:25:39,759 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION === [timeShiftErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:39,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:39,760 INFO L85 PathProgramCache]: Analyzing trace with hash 20768733, now seen corresponding path program 1 times [2021-11-25 18:25:39,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:39,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144961855] [2021-11-25 18:25:39,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:39,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:39,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:40,670 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 1 proven. 31 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-25 18:25:40,670 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:40,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144961855] [2021-11-25 18:25:40,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144961855] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:25:40,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995129417] [2021-11-25 18:25:40,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:40,671 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:40,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:25:40,674 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:25:40,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7626b1d8-527e-452d-b896-129ee50000eb/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:25:40,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:40,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 1312 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 18:25:40,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:25:42,500 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-25 18:25:42,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:26:25,873 WARN L227 SmtUtils]: Spent 40.58s on a formula simplification. DAG size of input: 1441 DAG size of output: 51 (called from [L 234] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2021-11-25 18:26:28,262 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-25 18:26:28,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995129417] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:26:28,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1338522905] [2021-11-25 18:26:28,284 INFO L159 IcfgInterpreter]: Started Sifa with 88 locations of interest [2021-11-25 18:26:28,284 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:26:28,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:26:28,294 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:26:28,294 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:26:31,031 INFO L197 IcfgInterpreter]: Interpreting procedure bigMacCall with input of size 573 for LOIs [2021-11-25 18:26:34,524 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 577 for LOIs [2021-11-25 18:26:35,155 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 570 for LOIs [2021-11-25 18:27:30,476 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentFloorID with input of size 66 for LOIs [2021-11-25 18:27:30,485 INFO L197 IcfgInterpreter]: Interpreting procedure isExecutiveFloorCalling with input of size 496 for LOIs [2021-11-25 18:27:32,210 INFO L197 IcfgInterpreter]: Interpreting procedure isPersonOnFloor with input of size 502 for LOIs [2021-11-25 18:27:34,639 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 505 for LOIs [2021-11-25 18:27:34,773 INFO L197 IcfgInterpreter]: Interpreting procedure resetCallOnFloor with input of size 453 for LOIs [2021-11-25 18:27:34,879 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull with input of size 437 for LOIs [2021-11-25 18:27:35,944 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 108 for LOIs [2021-11-25 18:27:35,978 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:27:54,033 WARN L227 SmtUtils]: Spent 5.27s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:27:59,962 WARN L227 SmtUtils]: Spent 5.40s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:28:23,820 WARN L227 SmtUtils]: Spent 7.95s on a formula simplification. DAG size of input: 496 DAG size of output: 441 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:31:00,859 WARN L227 SmtUtils]: Spent 7.64s on a formula simplification. DAG size of input: 700 DAG size of output: 600 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:31:13,452 WARN L227 SmtUtils]: Spent 9.30s on a formula simplification. DAG size of input: 724 DAG size of output: 612 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:31:17,896 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37174#(and (<= 0 |timeShift_processWaitingOnFloor_#in~floorID#1|) (= |old(~floorButtons_2~0)| 0) (<= ~floorButtons_3~0 0) (= ~executiveFloor~0 4) (= |timeShift_processWaitingOnFloor_~tmp___2~2#1| 0) (= |old(~persons_1~0)| 0) (<= ~currentFloorID~0 0) (<= ~currentHeading~0 1) (= |old(~persons_5~0)| 0) (not (= |timeShift___utac_acc__Specification14_spec__1_~tmp___2~6#1| 0)) (= |old(~doorState~0)| 1) (= ~currentFloorID~0 |timeShift___utac_acc__Specification14_spec__1_~tmp~29#1|) (= |old(~persons_2~0)| 0) (= |timeShift_processWaitingOnFloor_~tmp___6~1#1| 0) (= ~persons_5~0 0) (= |old(~persons_4~0)| 0) (<= ~personOnFloor_5_1~0 1) (<= |timeShift___utac_acc__Specification14_spec__1_~tmp___2~6#1| 2147483647) (= |old(~floorButtons_0~0)| 0) (<= ~weight~0 0) (= |timeShift_areDoorsOpen_~retValue_acc~13#1| |timeShift_areDoorsOpen_#res#1|) (<= 0 (+ 2147483648 |timeShift___utac_acc__Specification14_spec__1_~tmp___2~6#1|)) (<= ~floorButtons_0~0 0) (<= 0 ~floorButtons_1~0) (= |timeShift_isExecutiveFloor_~floorID#1| |timeShift_isExecutiveFloor_#in~floorID#1|) (= |timeShift_areDoorsOpen_#res#1| |timeShift___utac_acc__Specification14_spec__1_~tmp___1~8#1|) (<= 0 ~floorButtons_2~0) (<= |timeShift_resetFloorButton_#in~floorID#1| 0) (<= ~calls_0~0 0) (= ~head~0.offset 0) (<= 0 ~currentFloorID~0) (= |timeShift_stopRequestedAtCurrentFloor_~retValue_acc~25#1| 1) (<= 1 |timeShift_~tmp___9~2#1|) (= |old(~weight~0)| 0) (<= 0 |timeShift_resetFloorButton_#in~floorID#1|) (= ~persons_4~0 0) (<= |timeShift_processWaitingOnFloor_#in~floorID#1| 0) (= |timeShift_processWaitingOnFloor_~tmp___0~8#1| 0) (<= 0 ~floorButtons_3~0) (= |timeShift_isExecutiveFloor_~retValue_acc~29#1| (ite (= ~executiveFloor~0 |timeShift_isExecutiveFloor_~floorID#1|) 1 0)) (= |timeShift___utac_acc__Specification14_spec__1_~tmp___0~13#1| 0) (<= 0 |timeShift_processWaitingOnFloor_~floorID#1|) (<= 0 |timeShift_resetFloorButton_~floorID#1|) (= |timeShift_isExecutiveFloor_#in~floorID#1| |timeShift___utac_acc__Specification14_spec__1_~tmp~29#1|) (<= ~floorButtons_2~0 0) (= ~persons_3~0 0) (= |old(~floorButtons_4~0)| 0) (= |old(~persons_0~0)| 0) (= |timeShift___utac_acc__Specification14_spec__1_~tmp___0~13#1| |timeShift_isExecutiveFloor_#res#1|) (<= 0 ~floorButtons_0~0) (= |timeShift_stopRequestedAtCurrentFloor_~tmp~16#1| 0) (= ~doorState~0 1) (= |timeShift_processWaitingOnFloor_~tmp___10~0#1| 0) (<= 1 ~currentHeading~0) (<= 0 ~calls_0~0) (= |old(~persons_3~0)| 0) (= ~persons_1~0 0) (= ~persons_0~0 0) (= |old(~floorButtons_3~0)| 0) (= ~head~0.base 0) (<= 1 ~personOnFloor_5_1~0) (= |#NULL.offset| 0) (<= ~floorButtons_4~0 0) (<= |timeShift_~tmp___9~2#1| 1) (<= 1 |timeShift_stopRequestedAtCurrentFloor_#res#1|) (= |old(~currentHeading~0)| 1) (= |timeShift_processWaitingOnFloor_~tmp___8~1#1| 0) (<= |timeShift_resetFloorButton_~floorID#1| 0) (= |old(~personOnFloor_5_1~0)| 1) (= 1 |old(~calls_1~0)|) (= |timeShift_areDoorsOpen_~retValue_acc~13#1| ~doorState~0) (<= |timeShift_stopRequestedAtCurrentFloor_#res#1| 1) (<= 0 ~floorButtons_4~0) (= |old(~floorButtons_1~0)| 0) (= |old(~currentFloorID~0)| 0) (<= 0 |#StackHeapBarrier|) (= ~maximumWeight~0 100) (<= 0 ~weight~0) (<= ~floorButtons_1~0 0) (<= |timeShift_processWaitingOnFloor_~floorID#1| 0) (= ~cleanupTimeShifts~0 12) (= |timeShift_processWaitingOnFloor_~tmp___4~1#1| 0) (= |#NULL.base| 0) (= ~persons_2~0 0))' at error location [2021-11-25 18:31:17,896 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:31:17,896 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:31:17,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 15, 16] total 61 [2021-11-25 18:31:17,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513714372] [2021-11-25 18:31:17,897 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:31:17,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-25 18:31:17,898 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:31:17,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-25 18:31:17,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1110, Invalid=13652, Unknown=0, NotChecked=0, Total=14762 [2021-11-25 18:31:17,904 INFO L87 Difference]: Start difference. First operand 1090 states and 1694 transitions. Second operand has 61 states, 43 states have (on average 4.348837209302325) internal successors, (187), 46 states have internal predecessors, (187), 16 states have call successors, (49), 9 states have call predecessors, (49), 24 states have return successors, (49), 24 states have call predecessors, (49), 16 states have call successors, (49)